subject:( ville h te)

Indian Institute of Science

1. Anbarasu, M. Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications.

Degree: 2007, Indian Institute of Science

URL: http://hdl.handle.net/2005/617

► The Phase Change Memories (PCM) based on chalcogenide glasses are being considered recently as a possible replacement for conventional Non Volatile Random Access Memories (NVRAM).… (more)

▼ The Phase Change Memories (PCM) based on chalcogenide glasses are being considered recently as a possible replacement for conventional Non Volatile Random Access Memories (NVRAM). The main advantages of chalcogenide phase change memories are their direct write/overwrite capability, lower voltages of operation, large write/erase cycles, easiness to integrate with logic, etc. The phase change random access memories work on the principle of memory switching exhibited by chalcogenide glasses during which a local structural change (between amorphous and crystalline states) occurs due to an applied electric field. The development of newer phase change materials for NVRAM applications is based on synthesizing newer glass compositions and investigating their electrical switching characteristics by applying current/voltage pulses of different waveforms. The thermal studies on chalcogenide glasses which provide information about thermal stability, glass forming ability, etc., are also important while selecting a chalcogenide glass for PCM applications. The present thesis work deals with electrical switching and thermal studies on certain silicon based ternary telluride glasses (As-Te-Si, Ge-Te-Si and Al-Te-Si). The effect of network topological thresholds on the composition dependence of switching voltages and thermal parameters such as glass transition temperature, specific heat capacity, non-reversing enthalpy, etc., of these glasses has been investigated. The first chapter of the thesis provides an introduction to various properties of chalcogenide glasses, including their applications in phase change memories. The fundamental aspects of amorphous solids such as glass formation, glass transition, etc., are presented. Further, the concepts of rigidity percolation and self organization in glassy networks and the influence of local structural effects on the properties of glassy chalcogenides are discussed. Also, a brief history of evolution of phase change memories is presented. The second chapter deals with the experimental techniques employed in this thesis work; for sample preparation and for electrical switching studies, Alternating Differential Scanning Calorimetry (ADSC), Raman spectroscopy, NMR spectroscopy, etc. The third chapter discusses the electrical switching and thermal studies on As30Te70-xSix (2 ≤ x ≤ 22) and As40Te60-xSix (2 ≤ x ≤ 17) glasses. The composition dependence of electrical switching voltage (VT) and thermal parameters such as glass transition temperature (Tg), crystallization temperature (Tc), thermal stability (Tc-Tg), etc., reveals the occurrence of extended rigidity percolation and chemical thresholds in As30Te70-xSix and As40Te60-xSix glasses. Chapter 4 presents the electrical switching and thermal studies on Ge15Te85-xSix glasses (2 ≤ x ≤ 12). These glasses have been found to exhibit memory type electrical switching. While Ge15Te85-xSix glasses with x ≤ 5 exhibit a normal electrical switching, an unstable behavior is seen in the I-V characteristics of Ge15Te85-xSix glasses with x > 5… Advisors/Committee Members: Asokan, S.

Subjects/Keywords: Telluride Glasses - Electrical Properties; Chalcogenide Glasses; Chalcogenide Glasses - Phase Change Memory Applications; Telluride Glasses - Thermal Properties; Glassy Chalcogenides; As-Te-Si Glasses; Ge-Te-Si Glasses; Al-Te-Si Glasses; Phase Change Memory; Raman Scattering; Electrical Switching; SET-RESET Processes; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Anbarasu, M. (2007). Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/617

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Anbarasu, M. “Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications.” 2007. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/617.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Anbarasu, M. “Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications.” 2007. Web. 09 Dec 2019.

Vancouver:

Anbarasu M. Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications. [Internet] [Thesis]. Indian Institute of Science; 2007. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/617.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Anbarasu M. Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications. [Thesis]. Indian Institute of Science; 2007. Available from: http://hdl.handle.net/2005/617

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

2. Sreevidya Varma, G. Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications.

Degree: 2014, Indian Institute of Science

URL: http://hdl.handle.net/2005/3080

► The Science behind amorphous Chalcogenide materials opened up new technologies in the arena of Phase Change Memories. The Ovonic universal phase change memory is called… (more)

▼ The Science behind amorphous Chalcogenide materials opened up new technologies in the arena of Phase Change Memories. The Ovonic universal phase change memory is called universal because it can replace flash memory, DRAM and SRAM. These are not only basic computer memory devices but also are becoming the driving force for the ongoing revolutionary growth of cell phones and other mobile devices, which are in desperate need of memory providing higher density, faster speed and lower power consumption. In this thesis, compositional dependence of various properties of different chalcogenide glasses are investigated, to explore the possibility of their application in Phase Change Memories. Efforts are also made to understand the effect of rigidity and extended rigidity transition on the composition dependence of properties investigated. This thesis comprises of 9 chapters; a brief summary is given below. Chapter 1 deals with fundamental aspects of amorphous semiconductors with a particular reference to chalcogenide glasses. The advantages and applications of chalcogenide glasses are also described. Chapter 2 outlines preparation and characterization of the glasses investigated. The sample preparation and various experimental setup used in the present thesis work like Raman Scattering, Nanoindentation, Alternating Differential Scanning Calorimetry (ADSC), Photo-thermal Deflection Spectroscopy (PDS), Electrical Switching are summarized here. Chapter 3 deals with Micro-Raman studies in Ge15Te85-x Inx Glasses. Micro-Raman studies reveal that as-quenched Ge15Te85-xInx samples exhibit two prominent peaks, at 123 and 155 cm-1. In thermally annealed samples, the peaks at 120 cm-1 and 140 cm-1, which are due to crystalline Te, emerge as the strongest peaks. The Raman spectra of polished samples are similar to those of annealed samples, with strong peaks at 123 cm-1 and 141 cm-1. The spectra of lightly polished samples outside the thermally reversing window resemble those of thermally annealed samples; however, the spectra of glasses with compositions in the thermally reversing window resemble those of as-quenched samples. This observation confirms the earlier idea that compositions in the thermally reversing window are non-ageing and are more stable. Chapter 4 explains nanoindentation studies undertaken on Ge15Te85-xInx glasse (1 ≤ x ≤ 11). Nanoindentation studies on Ge15Te85-xInx glasses indicate that the hardness and elastic modulus of these glasses increase with indium concentration. While a pronounced plateau is seen in the elastic modulus in the composition range 3 ≤ x ≤ 7, the hardness exhibits a change in slope at compositions x = 3 and x = 7. Also, the density exhibits a broad maximum in this composition range. The observed changes in the mechanical properties and density are clearly associated with the thermally reversing window in Ge15Te85-xInx glasses in the composition range 3 ≤ x ≤ 7. In addition, a local minimum is seen in density and hardness around x = 9, the chemical threshold of the system. Chapter 5… Advisors/Committee Members: Asokan, S.

Subjects/Keywords: Chalcogenide Glasses; Germanium-Tellurium Glasses; Phase Change Memory; Chalcogenide Phase Change Memory; Indium Germanium-Tellurium Glasses; Silver Germanium-Tellurium Glasses; Amorphous Semiconductors; Ge-Te Indium Glasses; Ge-Te-In Glasses; Ge-Te Glasses; Ge15Te85-xInx Glasses; Ge15Te80-xIn5Agx Glasses; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sreevidya Varma, G. (2014). Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/3080

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sreevidya Varma, G. “Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications.” 2014. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/3080.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sreevidya Varma, G. “Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications.” 2014. Web. 09 Dec 2019.

Vancouver:

Sreevidya Varma G. Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications. [Internet] [Thesis]. Indian Institute of Science; 2014. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/3080.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sreevidya Varma G. Mechanical, Structural, Thermal and Electrical Studies on Indium and Silver Doped Ge-Te Glasses having Possible PCM Applications. [Thesis]. Indian Institute of Science; 2014. Available from: http://hdl.handle.net/2005/3080

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

3. Thenraj, M. A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes.

Degree: 2014, Indian Institute of Science

URL: http://hdl.handle.net/2005/2796

► Significant developments have been made in the field of C–H activation. However, various disadvantages, mainly low reactivity and selectivity, limit their usage in large-scale synthesis.… (more)

▼ Significant developments have been made in the field of C–H activation. However, various disadvantages, mainly low reactivity and selectivity, limit their usage in large-scale synthesis. It is crucial to understand the mechanisms and the nature of the transient species involved in the C–H activation paths to develop effective catalytic routes for homogeneous C–H functionalization reactions. Computational techniques are employed in this study to throw light on these processes. Chapter 1 briefly introduces C–H activation and functionalization reactions. After classifying the reactions on the basis of mechanisms, computational studies on the mechanisms of C–H activation reactions are described. The challenges involved in the discovery of efficient homogeneous C–H functionalization catalysts and progress made in the field are discussed. The insights provided to overcome the problems associated with the catalytic C–H functionalization reactions in a few examples are highlighted. In Chapter 2, DFT model studies are carried out to estimate the affinity and selectivity of 16-electron half-sandwich d6-metal fragments (η5–C5H5)Re(CO)2 and (η6–C6H6)W(CO)2 for binding with alkane C–H bonds. Different C–H binding sites of pentane, at the M06 level of theory have been evaluated. The effects of ancillary ligand variations on the metal–pentane binding strength are studied by substituting different ligands such as N-heterocyclic carbene (NHC), PF3 and NO+ for one of the carbonyl ligands. Isomers of the metal-pentane C–H σ-complexes studied in this chapter are shown in Scheme 1. Binding energies of the terminal methyl C–H bonds (C1 and C5) are significantly lower than those of the methylene C–H bonds (C2, C3 and C4) in all the cases. The metal–pentane binding interactions of the rhenium complexes are significantly stronger than those of the corresponding tungsten analogs. The PF3 complexes have slightly greater binding energies compared to the CO complexes, in both Re(I) and W(0) analogs. These results are in conformity with the experimental results. The electron-deficient nitrosyl complexes have the highest binding energies. These results illustrate that by proper tuning of the electronic factors of the transition-metal fragments with different ancillary ligands, the alkane C–H binding affinity can be controlled. Energy decomposition analyses (EDA) are carried out to determine the nature of the interaction between the metal fragments and pentane C–H bonds. Scheme 1. Formation of pentane C–H σ-complexes Chapter 3 addresses the energetics of various intramolecular site-exchange (chain walking) processes and C–H oxidative addition reactions (Scheme 2) of the pentane C–H σ-complexes studied in Chapter 2. Four possible site-exchange processes such as 1,2-, 1,3-, 1,4- and 1,5-migration processes are studied using DFT/M06 level of theory. η2-(H,H)···M type transition states are located for these migrations (Scheme 2). The 1,3-migration is the most favorable process. Two different pentyl hydride isomers, as shown in Scheme 2, are… Advisors/Committee Members: Samuelson, Ashoka G.

Subjects/Keywords: Hydrocarbons; Carbon-Hydrogen (C-H) Activation; Carbon-Hydrogen (C-H) Functionalization; Organometallic Compounds; Half-sandwich Complexes; Carbon-Hydrogen (C-H) Binding; Methylene C-H Bonded Alkane Complexes; Methylene C-H Bonded Alkene Complexes; C−H Metathesis; Organic Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Thenraj, M. (2014). A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2796

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Thenraj, M. “A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes.” 2014. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2796.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Thenraj, M. “A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes.” 2014. Web. 09 Dec 2019.

Vancouver:

Thenraj M. A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes. [Internet] [Thesis]. Indian Institute of Science; 2014. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2796.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Thenraj M. A Computational Study of C-H Binding, C-H Activation and Fluxional Processes of d6 Half- Sandwich Complexes. [Thesis]. Indian Institute of Science; 2014. Available from: http://hdl.handle.net/2005/2796

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

4. Chaudhary, Awanish Kumar. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.

Degree: 2011, Indian Institute of Science

URL: http://hdl.handle.net/2005/2125

► Helicobacter pylori is one of the most genetically diverse bacterial species that successfully colonizes at least 50% of the world population. It has been associated… (more)

▼ Helicobacter pylori is one of the most genetically diverse bacterial species that successfully colonizes at least 50% of the world population. It has been associated with humans for thousands of years and most probably evolved from ancestral gastric Helicobacter species in early mammals. One of the important characteristics of this pathogen is the degree of allelic diversity and genetic variability which helps it to adapt and colonize. Phase variation is one of the mechanisms used by H. pylori to generate variation. The presence of homopolymeric nucleotide or dinucleotide repeats in an ORF make it prone to frequent length changes as a consequence of slipped strand mispairing mediated mutagenesis. Interestingly, R-M genes comprise a significant percentage of H. pylori strain-specific genes and are more prevalent in H. pylori than in other bacterial species whose genomes have been fully sequenced. R-M systems in H. pylori have been identified on the basis of sequence similarity to known restriction endonucleases and methyltransferases, genetic organization, and specific enzyme isolation and characterization. Analysis of genome sequences of H. pylori strains 26695, J99, HPAGI and 26 others has revealed the presence of more than 20 R-M systems in each stain, which are far more than detected in any other bacterial genome sequence till date. hp1369 and hp1370 are two ORFs in stain 26695 coding for hypothetical proteins. hp 1369 has a stretch of poly-G repeats, thus making hp1369-hp1370, a candidate of phase variation. hpag1_1313 is homolog of hp1369-hp1370 which got up-regulated, in a person suffering from acute gastritis, thus making these genes an interesting subject of investigation. This study was therefore initiated with the following objectives: 1. Cloning, over-expression and purification of Type III MTase (ORF- hp1369- hp1370) and its cognate restriction enzyme (hp1371). 2. Biochemical characterization of MTase (HP1369-HP1370): Determination of oligomeric status, kinetic properties, binding affinities for AdoMet and DNA. Sequence analysis shows the presence of a poly-G track (10 Gs) at 3’-end of hp1369 which is a signature sequence for phase variation. Addition of a single nucleotide can place both hp1369 and hp1370 in-frame, which could code for a single polypeptide. hp1369 and hp1370 in H. pylori strain 26695 alone do not code for any functional protein but with the fusion of hp1369 and hp1370 can code for a protein with all the nine motifs of a DNA MTase. Interestingly, on the basis of arrangement of Motifs, it is probably the first example of ε type of methyltransferase. By site-directed mutagenesis a single G nucleotide was inserted in the poly-G track and both the ORFs (hp1369 and hp1370 ) became in-frame, coding for fully functional HP1369-HP1370 MTase. Kinetic parameters for functional HP1369-HP1370 MTase were determined, and has shown that there was substrate inhibition in methylation reaction at higher concentrations of AdoMets. When preincubation studies were done, enzyme-DNA complex was found to… Advisors/Committee Members: Rao, D N.

Subjects/Keywords: Helicobacter pylori; Methyltransferase; HP1369 - Genetics; HP1370 - Genetics; Restriction-Modification Systems; Helicobacter Pylori Genome; H. pylori; MTase; H. pylori Genome; Bacteriology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chaudhary, A. K. (2011). Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2125

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chaudhary, Awanish Kumar. “Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.” 2011. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2125.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chaudhary, Awanish Kumar. “Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.” 2011. Web. 09 Dec 2019.

Vancouver:

Chaudhary AK. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2125.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chaudhary AK. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. [Thesis]. Indian Institute of Science; 2011. Available from: http://hdl.handle.net/2005/2125

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

5. Chaudhary, Awanish Kumar. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.

Degree: 2011, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/2125 ; http://etd.ncsi.iisc.ernet.in/abstracts/2729/G24891-Abs.pdf

► Helicobacter pylori is one of the most genetically diverse bacterial species that successfully colonizes at least 50% of the world population. It has been associated… (more)

▼ Helicobacter pylori is one of the most genetically diverse bacterial species that successfully colonizes at least 50% of the world population. It has been associated with humans for thousands of years and most probably evolved from ancestral gastric Helicobacter species in early mammals. One of the important characteristics of this pathogen is the degree of allelic diversity and genetic variability which helps it to adapt and colonize. Phase variation is one of the mechanisms used by H. pylori to generate variation. The presence of homopolymeric nucleotide or dinucleotide repeats in an ORF make it prone to frequent length changes as a consequence of slipped strand mispairing mediated mutagenesis. Interestingly, R-M genes comprise a significant percentage of H. pylori strain-specific genes and are more prevalent in H. pylori than in other bacterial species whose genomes have been fully sequenced. R-M systems in H. pylori have been identified on the basis of sequence similarity to known restriction endonucleases and methyltransferases, genetic organization, and specific enzyme isolation and characterization. Analysis of genome sequences of H. pylori strains 26695, J99, HPAGI and 26 others has revealed the presence of more than 20 R-M systems in each stain, which are far more than detected in any other bacterial genome sequence till date. hp1369 and hp1370 are two ORFs in stain 26695 coding for hypothetical proteins. hp 1369 has a stretch of poly-G repeats, thus making hp1369-hp1370, a candidate of phase variation. hpag1_1313 is homolog of hp1369-hp1370 which got up-regulated, in a person suffering from acute gastritis, thus making these genes an interesting subject of investigation. This study was therefore initiated with the following objectives: 1. Cloning, over-expression and purification of Type III MTase (ORF- hp1369- hp1370) and its cognate restriction enzyme (hp1371). 2. Biochemical characterization of MTase (HP1369-HP1370): Determination of oligomeric status, kinetic properties, binding affinities for AdoMet and DNA. Sequence analysis shows the presence of a poly-G track (10 Gs) at 3’-end of hp1369 which is a signature sequence for phase variation. Addition of a single nucleotide can place both hp1369 and hp1370 in-frame, which could code for a single polypeptide. hp1369 and hp1370 in H. pylori strain 26695 alone do not code for any functional protein but with the fusion of hp1369 and hp1370 can code for a protein with all the nine motifs of a DNA MTase. Interestingly, on the basis of arrangement of Motifs, it is probably the first example of ε type of methyltransferase. By site-directed mutagenesis a single G nucleotide was inserted in the poly-G track and both the ORFs (hp1369 and hp1370 ) became in-frame, coding for fully functional HP1369-HP1370 MTase. Kinetic parameters for functional HP1369-HP1370 MTase were determined, and has shown that there was substrate inhibition in methylation reaction at higher concentrations of AdoMets. When preincubation studies were done, enzyme-DNA complex was found to… Advisors/Committee Members: Rao, D N.

Subjects/Keywords: Helicobacter pylori; Methyltransferase; HP1369 - Genetics; HP1370 - Genetics; Restriction-Modification Systems; Helicobacter Pylori Genome; H. pylori; MTase; H. pylori Genome; Bacteriology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chaudhary, A. K. (2011). Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2125 ; http://etd.ncsi.iisc.ernet.in/abstracts/2729/G24891-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chaudhary, Awanish Kumar. “Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.” 2011. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/2125 ; http://etd.ncsi.iisc.ernet.in/abstracts/2729/G24891-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chaudhary, Awanish Kumar. “Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase.” 2011. Web. 09 Dec 2019.

Vancouver:

Chaudhary AK. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/2125 ; http://etd.ncsi.iisc.ernet.in/abstracts/2729/G24891-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chaudhary AK. Characterization Of HP1369-HP1370 From Helicobacter Pylori : A Novel ε Type N6 –Adenine Methyltransferase. [Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ernet.in/handle/2005/2125 ; http://etd.ncsi.iisc.ernet.in/abstracts/2729/G24891-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

6. Lakshmi, K P. Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories.

Degree: 2013, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3359 ; http://etd.iisc.ernet.in/abstracts/4227/G25760-Abs.pdf

► Chalcogenide glasses are a class of covalent amorphous semiconductors with interesting properties. The presence of short-range order and the pinned Fermi level are the two… (more)

▼ Chalcogenide glasses are a class of covalent amorphous semiconductors with interesting properties. The presence of short-range order and the pinned Fermi level are the two important properties that make them suitable for many applications. With flash memory technology reaching the scaling limit as per Moore’s law, alternate materials and techniques are being researched at for realizing next generation non-volatile memories. Two such possibilities that are being looked at are Phase Change Memory (PCM) and Programmable Metallization Cell (PMC) both of which make use of chalcogenide materials. This thesis starts with a survey of the work done so far in realizing PCMs in reality. For chalcogenides to be used as a main memory or as a replacement to FLASH technology, the electrical switching parameters like switching voltage, programming current, ON state and OFF state resistances, switching time and optical parameters like band gap are to be considered. A survey on the work done in this regard has revealed that various parameters such as chemical composition of the PC material, nature of additives used to enhance the performance of PCM, topological thresholds (Rigidity Percolation Threshold and Chemical Threshold), device geometry, thickness of the active volume, etc., influence the electrical switching parameters. This has motivated to further investigate the material and experimental parameters that affect switching and also to explore the possibility of multi level switching. In this thesis work, the feasibility of using two chalcogenide systems namely Si15Te85-xGex and Ge15Te85-xAgx in the form of amorphous thin films for PCM application is explored. In the process, electrical switching experiments have been carried out on thin films belonging to these systems and the results obtained are found to exhibit some interesting anomalies. Further experiments and analysis have been carried out to understand these anomalies. Finally, the dynamics of electrical switching has been investigated and presented for amorphous Si15Te85-xGex thin films. From these studies, it is also seen that multi state switching/multiple resistance levels of the material can be achieved by current controlled switching, the mechanisms of which have been further probed using XRD analysis and AFM studies. In addition, investigations have been carried out on the electrical switching behavior of amorphous Ge15Te85-xAgx thin film devices and optical band gap studies on amorphous Ge15Te85-xAgx thin films. Chapter one of the thesis, gives a brief introduction to the limitations in existing memory technology and the alternative memory technologies that are being researched, based on which it can be inferred that PCM is a promising candidate for the next generation non volatile memory. This chapter also discusses the principle of using PCM to store data, realization of PCM using chalcogenides, the material properties to be considered in designing PCM, the trade offs in the process of design and the current trends in PCM technology. Chapter two… Advisors/Committee Members: Asokan, S.

Subjects/Keywords: Phase Change Memory (PCM); Amorphous Thin Films; Chalcogenide Glasses; Chalcogenide Glasses - Electrical Switching; Amorphous Thin Films - Optical Band Gap; Anorphous Thin Films - Electrical Switching; Amorphous Chalcogenide Thin Films; Silicon Telluride Germanium Amorphous Thin Films; Germanium Telluride Silver Amorphous Thin Films; Si–Te–Ge Thin Films; Si15Te75Ge10 Thin Films; Si15Te85-xGex Thin Films; Ge-Te-Ag Thin Films; Electronic Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lakshmi, K. P. (2013). Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3359 ; http://etd.iisc.ernet.in/abstracts/4227/G25760-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lakshmi, K P. “Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories.” 2013. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/2005/3359 ; http://etd.iisc.ernet.in/abstracts/4227/G25760-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lakshmi, K P. “Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories.” 2013. Web. 09 Dec 2019.

Vancouver:

Lakshmi KP. Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories. [Internet] [Thesis]. Indian Institute of Science; 2013. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/2005/3359 ; http://etd.iisc.ernet.in/abstracts/4227/G25760-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lakshmi KP. Studies on Si15Te85-xGex and Ge15Te85-xAgx Amorphous Thin Films for Possible Applications in Phase Change Memories. [Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ernet.in/2005/3359 ; http://etd.iisc.ernet.in/abstracts/4227/G25760-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

7. Manna, Madhu Sudan. Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis.

Degree: 2015, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3664 ; http://etd.iisc.ernet.in/abstracts/4534/G27316-Abs.pdf

► The thesis entitled “Controlling Stereochemistry at the Quaternary Center Using Bifunctional (Thio)urea Catalysis” is divided into five chapters. Chapter 1: Catalytic Enantioselective Construction of Quaternary… (more)

▼ The thesis entitled “Controlling Stereochemistry at the Quaternary Center Using Bifunctional (Thio)urea Catalysis” is divided into five chapters. Chapter 1: Catalytic Enantioselective Construction of Quaternary Stereocenters through Direct Vinylogous Michael Addition of Deconjugated Butenolides to Nitroolefins The direct use of deconjugated butenolides in asymmetric C–C bond forming reaction is a powerful but challenging task because of the additional problem of regioselectivity along with the issues of diastereo- and enantioselectivity. In this chapter, a direct asymmetric vinylogous Michael addition of deconjugated butenolides to nitroolefins has been demonstrated for the construction of quaternary stereocenter at the γ-position of butenolides. A novel thiourea-based bifunctional organocatalyst, containing two elements of chirality, was synthesized starting from commercially available quinine and (S)-tert-leucine. Remarkably, the sense of stereoinduction in this process is dominated by the tert-leucine segment of the catalyst. Synthetically versatile & highly functionalized γ-butenolides with contiguous quaternary and tertiary stereocenters were synthesized stereoselectively. The reaction was found to be general and a wide range of nitroolefins, with both electron-rich and electron-deficient substituents, underwent smooth reaction under these mild conditions. Similarly, deconjugated butenolides, having various substituents at the γ-position were well tolerated under these reaction conditions and the products were obtained in excellent yields and with uniformly high diastereo- and enantioselectivities. Reference: Manna, M. S.; Kumar, V.; Mukherjee, S. Chem. Commun. 2012, 48, 5193–5195. Chapter 2: Catalytic Asymmetric Direct Vinylogous Michael Addition of Deconjugated Butenolides to Maleimides for the Construction of Quaternary Stereogenic Center In this chapter, a mild and operationally simple protocol for the direct vinylogous Michael addition of deconjugated butenolides to maleimides has been illustrated. Using bifunctional tertiary amino thiourea organocatalyst, derived from a ‘matched’ combination of trans-(1R,2R)-diaminocyclohexane (DACH) and (S)-tert-leucine, the Michael adducts were obtained in excellent yields and with good to high diastereoselectivities and outstanding enantioselectivities. Application of the corresponding diastereomeric catalyst indicated the dominance of the ‘DACH’ unit over the chiral side chain in determining the sense of stereoinduction. The practicality of this protocol is illustrated by substantial low catalyst loading (down to 5 mol%) and one-pot catalyst recycling. Based on the X-ray structure of the catalyst and observed stereochemistry of the Michael adduct, a stereochemical model is proposed which was further supported by additional experiment. Reference: Manna, M. S.; Mukherjee, S. Chem.–Eur. J. 2012, 18, 15277–15282. Chapter 3: Enantioselective Desymmetrization of Cyclopentenedione through Direct Catalytic Vinylogous Michael Addition of Deconjugated Butenolides … Advisors/Committee Members: Mukherjee, Santanu.

Subjects/Keywords: Urea Catalysis; Stereochemistry; Asymmetric Organocatalysis; Bifunctional (thio)urea Catalysis; Quaternary Stereocenter; Maleimides; Thiourea Catalysts; Cyclopentenedione; Deconjugated Butenolides; Vinylogous Michael Addition; C(sp2)−H Alkylation; C(sp2)−H Vinylation; Organic Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Manna, M. S. (2015). Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3664 ; http://etd.iisc.ernet.in/abstracts/4534/G27316-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Manna, Madhu Sudan. “Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis.” 2015. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/2005/3664 ; http://etd.iisc.ernet.in/abstracts/4534/G27316-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Manna, Madhu Sudan. “Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis.” 2015. Web. 09 Dec 2019.

Vancouver:

Manna MS. Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis. [Internet] [Thesis]. Indian Institute of Science; 2015. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/2005/3664 ; http://etd.iisc.ernet.in/abstracts/4534/G27316-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Manna MS. Controlling Stereochemistry at the Quaternary Center using Bifunctional (THIO)Urea Catalysis. [Thesis]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ernet.in/2005/3664 ; http://etd.iisc.ernet.in/abstracts/4534/G27316-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

8. Shenoy, Megha. Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates.

Degree: 2007, Indian Institute of Science

URL: http://hdl.handle.net/2005/696

► Despite a long history of investigations on protective ant-plant interactions, since the late 19century (Thomas Belt 1874), a comprehensive quantitative understanding of the adaptations that… (more)

▼ Despite a long history of investigations on protective ant-plant interactions, since the late 19century (Thomas Belt 1874), a comprehensive quantitative understanding of the adaptations that facilitate these associations between plants and ants and the differential importance of these adaptations in predicting the benefits and costs to each partner and in shedding light on the evolutionary trajectories of this ecologically widespread interaction is yet to be realized. In the present study we have experimentally shown that the identity of the ant species (T. albipes), the abundance of this ant species and the composition of EFN produced by floral buds and young leaves of H. brunonis plant populations contribute to facilitating protection of floral bud inflorescences and young leaves of H. brunonis populations in a particular site. Of all the 16 ant species that inhabit the domatia of H. brunonis at several sites, the plant has found its protective ant partner only in the dolichoderine ant T. albipes and that too, only in the southernmost site In our experimental set up of three populations of H. brunonis at three different latitudes, where each site is separated from another site by at least 200 km, we have shown that only the southernmost population (Solaikolli) in protected by the ant species T. albipes. Although T. albipes is found in two of the three populations used in the present study (Sampaji and Solaikolli), it is present in a relatively larger abundance both within the domatia of H. brunonis and in the terrestrial stratum only in the southernmost site Solaikolli and is hence able to protect the EFN producing structures of H. brunonis at this site. In comparison, T. albipes is found in low abundance both in the domatia and in the terrestrial stratum in the site Sampaji and does not protect EFN producing plant parts of H. brunonis at this site. We have also experimentally shown that the young leaves of H. brunonis at this southernmost site Solaikolli are protected to a greater extent than the floral bud inflorescences, since T. albipes preferentially utilized EFN produced by young leaves compared to EFN produced by floral buds at this site. Moreover, we have also shown that the floral buds of H. brunonis in the northernmost site are unprotected for two reasons: i. the absence of the protective ant species T.albipes at this site. ii. The EPN produced by some of floral buds at this site is differentially utilized to a much lower extent than floral buds from other sites due to EFN from Agumbe being > 400-fold more viscous than the EFN produced by floral buds at the other two sites (sampaji and Solaikolli) (at 30º C). Although previous studies have independently shown that the identity of the ant partner (Janzen 1966, Schemske 1980, Horvitz and Schemske 1984, Heads 1986, Oliveira et al. 1987a, b; Jaffe et al. 1989, RicoGray and Thien 1989, Davidson et al. 1991) and the abundance of the protective ant species (Koptur 1984, Rocha and Bergallo 1992, Di Giusto et al. 2001) are important in predicting the… Advisors/Committee Members: Borges, Renee M.

Subjects/Keywords: Fabaceae - Ecology; Humboldtia Brunonis; Ant-Plant Interactions; Ant-Plant Mutualism; Myrmecophytes; H. brunonis; Animal Physiology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shenoy, M. (2007). Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/696

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shenoy, Megha. “Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates.” 2007. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/696.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shenoy, Megha. “Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates.” 2007. Web. 09 Dec 2019.

Vancouver:

Shenoy M. Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates. [Internet] [Thesis]. Indian Institute of Science; 2007. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/696.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shenoy M. Spatial Variation In Interactions Of The Semi-Myrmecophyte Humboldtia Brunonis (Fabaceae) With Ants And Other Invertebrates. [Thesis]. Indian Institute of Science; 2007. Available from: http://hdl.handle.net/2005/696

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

9. Kumar, Ritesh. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.

Degree: 2010, Indian Institute of Science

URL: http://hdl.handle.net/2005/2029

► Helicobacter pylori is one of the most potential and successful human pathogen which colonizes atleast 50% of world population. One of the important characteristics of… (more)

▼ Helicobacter pylori is one of the most potential and successful human pathogen which colonizes atleast 50% of world population. One of the important characteristics of this pathogen is the degree of allelic diversity and genetic variability which helps it to adapt and colonize. Phase variation is one of the mechanisms used by Helicobacter pylori to generate variation, where presence of homopolymeric nucleotide or dinucleotide repeats in an ORF make it prone to frequent length changes as a consequence of slipped strand mispairing mediated mutagenesis. An important feature of H. pylori biology is the presence of a large number of Restriction-Modification (R-M) systems in its genome. Till date, seven strains have been completely sequenced and each have more than 20 R-M systems. The presence of homopolymeric nucleotide or dinucleotide repeats in many of R-M systems make them an interesting subject for investigation. Here, we show that hp0051 which codes for a C5 cytosine methyltransferase from H. pylori is a hypermutable gene, which undergoes random mutations. In addition it exhibits phase variation due to presence of a dinucleotide (AG) repeat which results in a truncated protein. hp0051 homologs were amplified and sequenced from different clinical isolates of H. pylori. Sequence analysis showed that hp0051 homologs from 23 clinical isolates are different from each other suggesting a hypervariable nature of the sequence. It was observed that when over expressed in E. coli hp0051 undergoes random mutations. These mutations give rise to different variants of HP0051 with different biochemical properties. Different variants of HP0051 were biochemically characterized. All variants recognize 5´-CCTC-3´ and methylate the first cytosine. A few of the isoforms exhibit degeneracy in the recognition site as they recognize 5´- CNCC-3´ (N being any nucleotide) and methylates third cytosine. Molecular modelling studies suggest that HP0051 has two domains, one large domain having catalytic and AdoMet binding motifs and small domain having target recognition domain. DNA sequencing, peptide finger mapping, MALDI MS-MS and CD have been used to establish the differences between the different isoforms of HP0051. Interestingly when a mutant protein which lacks methylation activity was expressed in E.coli random mutations were not observed. To understand the role of methylation in the occurrence of random mutations, microarray analysis was done. Microarray analysis have shown that the overexpression of HP0051 results in the down regulation of deoxyadenine methyltransferase (dam) in E.coli. Microarray data were further authenticated by RT PCR analysis. dam plays a vital role in mismatch repair pathway and down regulation of dam results in enhanced mutation rates. A large number of clinical isolates were analysed for the presence of hp0051 and hp0051 was found to be present in 83% of strains obtained from patients compared to 25 % of strains from healthy volunteers. Single colonies obtained from the same patient were analysed and it was… Advisors/Committee Members: Rao, D N.

Subjects/Keywords: Helicobacter pylori; Genomes; Biochemical Genetics; DNA Methyltransferase; Adenine Methyltansferase; HP0051; H. pylori; Bacteriology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kumar, R. (2010). Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kumar, Ritesh. “Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.” 2010. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kumar, Ritesh. “Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.” 2010. Web. 09 Dec 2019.

Vancouver:

Kumar R. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kumar R. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. [Thesis]. Indian Institute of Science; 2010. Available from: http://hdl.handle.net/2005/2029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

10. Kumar, Ritesh. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.

Degree: 2010, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/2029 ; http://etd.ncsi.iisc.ernet.in/abstracts/2625/G23794-Abs.pdf

► Helicobacter pylori is one of the most potential and successful human pathogen which colonizes atleast 50% of world population. One of the important characteristics of… (more)

▼ Helicobacter pylori is one of the most potential and successful human pathogen which colonizes atleast 50% of world population. One of the important characteristics of this pathogen is the degree of allelic diversity and genetic variability which helps it to adapt and colonize. Phase variation is one of the mechanisms used by Helicobacter pylori to generate variation, where presence of homopolymeric nucleotide or dinucleotide repeats in an ORF make it prone to frequent length changes as a consequence of slipped strand mispairing mediated mutagenesis. An important feature of H. pylori biology is the presence of a large number of Restriction-Modification (R-M) systems in its genome. Till date, seven strains have been completely sequenced and each have more than 20 R-M systems. The presence of homopolymeric nucleotide or dinucleotide repeats in many of R-M systems make them an interesting subject for investigation. Here, we show that hp0051 which codes for a C5 cytosine methyltransferase from H. pylori is a hypermutable gene, which undergoes random mutations. In addition it exhibits phase variation due to presence of a dinucleotide (AG) repeat which results in a truncated protein. hp0051 homologs were amplified and sequenced from different clinical isolates of H. pylori. Sequence analysis showed that hp0051 homologs from 23 clinical isolates are different from each other suggesting a hypervariable nature of the sequence. It was observed that when over expressed in E. coli hp0051 undergoes random mutations. These mutations give rise to different variants of HP0051 with different biochemical properties. Different variants of HP0051 were biochemically characterized. All variants recognize 5´-CCTC-3´ and methylate the first cytosine. A few of the isoforms exhibit degeneracy in the recognition site as they recognize 5´- CNCC-3´ (N being any nucleotide) and methylates third cytosine. Molecular modelling studies suggest that HP0051 has two domains, one large domain having catalytic and AdoMet binding motifs and small domain having target recognition domain. DNA sequencing, peptide finger mapping, MALDI MS-MS and CD have been used to establish the differences between the different isoforms of HP0051. Interestingly when a mutant protein which lacks methylation activity was expressed in E.coli random mutations were not observed. To understand the role of methylation in the occurrence of random mutations, microarray analysis was done. Microarray analysis have shown that the overexpression of HP0051 results in the down regulation of deoxyadenine methyltransferase (dam) in E.coli. Microarray data were further authenticated by RT PCR analysis. dam plays a vital role in mismatch repair pathway and down regulation of dam results in enhanced mutation rates. A large number of clinical isolates were analysed for the presence of hp0051 and hp0051 was found to be present in 83% of strains obtained from patients compared to 25 % of strains from healthy volunteers. Single colonies obtained from the same patient were analysed and it was… Advisors/Committee Members: Rao, D N.

Subjects/Keywords: Helicobacter pylori; Genomes; Biochemical Genetics; DNA Methyltransferase; Adenine Methyltansferase; HP0051; H. pylori; Bacteriology

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kumar, R. (2010). Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2029 ; http://etd.ncsi.iisc.ernet.in/abstracts/2625/G23794-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kumar, Ritesh. “Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.” 2010. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/2029 ; http://etd.ncsi.iisc.ernet.in/abstracts/2625/G23794-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kumar, Ritesh. “Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection.” 2010. Web. 09 Dec 2019.

Vancouver:

Kumar R. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/2029 ; http://etd.ncsi.iisc.ernet.in/abstracts/2625/G23794-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kumar R. Helicobacter Pylori Restriction-Modification Systems : Possible Roles Beyond Genome Protection. [Thesis]. Indian Institute of Science; 2010. Available from: http://etd.iisc.ernet.in/handle/2005/2029 ; http://etd.ncsi.iisc.ernet.in/abstracts/2625/G23794-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

11. Adarsha Rao, S J. Polymorphic ASIC : For Video Decoding.

Degree: 2013, Indian Institute of Science

URL: http://hdl.handle.net/2005/3291

► Video applications are becoming ubiquitous in recent times due to an explosion in the number of devices with video capture and display capabilities. Traditionally, video… (more)

▼ Video applications are becoming ubiquitous in recent times due to an explosion in the number of devices with video capture and display capabilities. Traditionally, video applications are implemented on a variety of devices with each device targeting a speciﬁc application. However, the advances in technology have created a need to support multiple applications from a single device like a smart phone or tablet. Such convergence of applications necessitates support for interoperability among various applications, scalable performance meet the requirements of different applications and a high degree of reconﬁgurability to accommodate rapid evolution in applications features. In addition, low power consumption requirement is also very stringent for many video applications. The conventional custom hardware implementations of video applications deliver high performance at low power consumption while the recent MPSoC implementations enable high degree of interoperability and are useful to support application evolution. In this thesis, we combine the best features of custom hardware and MPSoC approaches to design a Polymorphic ASIC. A Polymorphic ASIC is an integrated circuit designed to meet the requirements of several applications belonging to a particular domain. A polymorphic ASIC consists of a fabric of computation, storage and communication resources, using which applications are composed dynamically. Although different video applications differ widely in the internal de-tails of operation, at the heart of almost every video application is a video codec (encoder and decoder). The requirements of scalability, high performance and low power consumption are very stringent for video decoding. Therefore this thesis focuses mainly on the architectural design of a Polymorphic ASIC for video decoding. We present an uniﬁed software and hardware architecture (USHA) for Polymorphic ASIC. USHA is a tiled architecture which uses loosely coupled processor and hardware tiles that are software programmable and hardware reconﬁgurable respectively. The distinctive feature of Polymorphic ASIC is the static partitioning of the application and dynamic mapping of ap-plication processes onto the computational tiles. Depending on the application scenarios, a process may be mapped onto one of the hardware or processor tiles. Polymorphic ASIC incor-porates a network–on–chip (NoC) to achieve ﬂexible communication across different tiles. Formulation of a programming framework for Polymorphic ASIC requires an implementation model that captures the structure of video decoder applications as well as the properties of the Polymorphic ASIC architecture. We derive an implementation model based on a combination of parametric polyhedral process networks, stream based functions and windowed dataﬂow models of computation. The implementation model leads to a process network oriented compilation ﬂow that achieves realization agnostic application partitioning and enables seamless migration across uniprocessor, multi–processor, semi hardware and full… Advisors/Committee Members: Nandy, S K.

Subjects/Keywords: Application Specific Integrated Circuits (ASIC); Polymorphic ASIC (Applicaion Specific Integrated Circuits); Unified Software and Hardware Architecture (USHA); Video Decoding; Polymorphic ASIC Architecture; Multiprocessor System-On-Chip (MPSoC); H.264 Decoder; Video Encoding; H.264 Decoders; H.264 Decoding; Computer Science

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adarsha Rao, S. J. (2013). Polymorphic ASIC : For Video Decoding. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/3291

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adarsha Rao, S J. “Polymorphic ASIC : For Video Decoding.” 2013. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/3291.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adarsha Rao, S J. “Polymorphic ASIC : For Video Decoding.” 2013. Web. 09 Dec 2019.

Vancouver:

Adarsha Rao SJ. Polymorphic ASIC : For Video Decoding. [Internet] [Thesis]. Indian Institute of Science; 2013. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/3291.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adarsha Rao SJ. Polymorphic ASIC : For Video Decoding. [Thesis]. Indian Institute of Science; 2013. Available from: http://hdl.handle.net/2005/3291

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

12. Vinod, E M. Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5.

Degree: 2013, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3339 ; http://etd.iisc.ernet.in/abstracts/4204/G25733-Abs.pdf

► GeTe and Ge2Sb2Te5 alloys are potential candidates for non-volatile phase change random access memories (PCRAM). For electrical data storage applications the materials should have stable… (more)

▼ GeTe and Ge2Sb2Te5 alloys are potential candidates for non-volatile phase change random access memories (PCRAM). For electrical data storage applications the materials should have stable amorphous and crystalline phases, fast crystallization time, low power to switch, and high crystallization activation energy (to be stable at normal operating temperatures). Phase change memories can be tuned through compositional variations to achieve sufficient phase change contrast and thermal stability for data retention. Selenium is one of the attractive choices to use as an additive material owing to its flexible amorphous structure and a variety of possible applications in optoelectronics and solar cells. GeSb2Te3Se alloy, in which 25 at.% of Se substituted for Te, show a higher room temperature resistance with respect to parent GeSb2Te4 alloy, but the transition temperature is lowered which will affect the thermal stability. The RESET current observed for Sb65Se35 alloys were reduced and the crystallization speed increased 25 % faster with respect to Ge2Sb2Te5. Alloys of Ga-Sb-Se possess advantages such as higher crystallization temperatures, better data retention, higher switching speed, lower thermal conductivity and lower melting point than the GST, but the resistance ratio is limited to about two orders of magnitude. This affects the resistance contrast and data readability. It is with this background a study has been carried out in GeTe and GeSbTe system with Se doping. Studies on structural, thermal and optical properties of these materials all through the phase transition temperatures would be helpful to explore the feasibility of phase change memory uses. Thin films along with their bulk counterparts such as (GeTe)1-x Sex ( 0 < x ≤ 0.50) and (GST)1-xSex (0 < x ≤ 0.50), including GeTe and GST alloys, have been prepared. The results are presented in four chapters apart from the Introduction and Experimental techniques chapters. The final chapter summarizes the results. Chapter 1 provides an introduction to chalcogenide glasses, phase change memory materials and their applications. The fundamental properties of amorphous solids, basic phase change properties of Ge2Sb2Te5 and GeTe alloys and their applications are presented in detail. Various doping studies on GeTe and Ge2Sb2Te5 reported in literatures are reviewed. The limitations, challenges, future and scope of the present work are presented. In chapter 2, the experimental techniques used for thin film preparation, electrical characterizations, optical characterization and surface characterizations etc. are explained. Chapter 3 deals entirely on Ge2Sb2Te5 films studied throughout the phase transition, by annealing at different temperatures. Changes in sheet resistance, optical transmission, morphology and surface bonding characteristics are analyzed. The crystallization leads to an increase of roughness and the resistance changes to three orders of magnitude at 125 °C. Optical studies show distinct changes in transmittance during phase transitions and the optical… Advisors/Committee Members: Sangunni, K S.

Subjects/Keywords: Amorphous Solids; Phase Change Memory Alloys; Germanium-Tellurium Phase Change Memory Alloys; Germanium-Antimony-TelluriumPhase Change Memory Alloys; Amorphous Semiconductors; Selenium Doped GeTe Alloys; Selenium Doped GeSbTe Alloys; Chalcogenide Glasses; GeTe Thin Films; GST (Germanium-Antimony-Tellurium) Films; Phase Change Random Access Memory; Phase Change Memory Materials; Ge2Sb2Te5 Thin Films; Ge-Te Phase Change Memory Alloys; Ge-Sb-Te Phase Change Memory Alloys; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vinod, E. M. (2013). Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3339 ; http://etd.iisc.ernet.in/abstracts/4204/G25733-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vinod, E M. “Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5.” 2013. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/2005/3339 ; http://etd.iisc.ernet.in/abstracts/4204/G25733-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vinod, E M. “Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5.” 2013. Web. 09 Dec 2019.

Vancouver:

Vinod EM. Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5. [Internet] [Thesis]. Indian Institute of Science; 2013. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/2005/3339 ; http://etd.iisc.ernet.in/abstracts/4204/G25733-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vinod EM. Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5. [Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ernet.in/2005/3339 ; http://etd.iisc.ernet.in/abstracts/4204/G25733-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

13. Prakash, S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.

Degree: 1996, Indian Institute of Science

URL: http://hdl.handle.net/2005/1704

Subjects/Keywords: Amorphous Semiconductors Switching; Melt Quenching; Electric Switches; Semiconductors; Chalcogenides Semiconductors; Ge-As-Te Glasses; Applied Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prakash, S. (1996). Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prakash, S. “Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.” 1996. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/1704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prakash, S. “Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.” 1996. Web. 09 Dec 2019.

Vancouver:

Prakash S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. [Internet] [Thesis]. Indian Institute of Science; 1996. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/1704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prakash S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. [Thesis]. Indian Institute of Science; 1996. Available from: http://hdl.handle.net/2005/1704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

14. Prashanth, S B Bhanu. Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides.

Degree: 2008, Indian Institute of Science

URL: http://hdl.handle.net/2005/735

► The absence of long-range order in glassy chalcogenides provides the convenience of changing the elemental ratios and hence the properties over a wide range. The… (more)

▼ The absence of long-range order in glassy chalcogenides provides the convenience of changing the elemental ratios and hence the properties over a wide range. The interesting properties exhibited by chalcogenide glasses make them suitable materials for Phase Change Memories (PCM) and other applications such as infrared optical devices, photo-receptors, sensors, waveguides, etc. One of the most remarkable properties of chalcogenides is their electrical switching behavior. Reversible (threshold type) or irreversible (memory type) switching from a high resistance OFF state to a low resistance ON state in glassy chalcogenides occurs at a critical voltage called the threshold/switching voltage (VT). Investigations on the switching behavior and its composition dependence throw light on the local structural effects of amorphous chalcogenide semiconductors and also help us in identifying suitable samples for PCM applications. Thermal analysis by Differential Scanning Calorimetry (DSC) has been extensively used in glass science, particularly for measurements of thermal parameters such as enthalpy of relaxation, specific heat change, etc., near glass transition. Quite recently, the conventional DSC has been sophisticated by employing a composite temperature profile for heating, resulting in the Temperature Modulated DSC (TMDSC) or Alternating DSC (ADSC). Measurements made using ADSC reveal thermal details with enhanced accuracy and resolution, and this has lead to a better understanding of the nature of glass transition. The thermal parameters obtained using DSC/ADSC are also vital for understanding the electrical switching behavior of glassy chalcogenides. The motivation of this thesis was twofold: The first was to develop a novel, high voltage programmable power supply for electrical switching analysis of samples exhibiting high VT, and second to investigate the thermal and electrical switching behavior of certain Se-Te based glasses with Ge and Sb additives. The thesis contains seven chapters: Chapter 1: This chapter provides an overview of amorphous semiconductors (a-SC) with an emphasis on preparation and properties of glassy chalcogenides. The various structural models and topological thresholds of a-SC are discussed with relations to the glass forming ability of materials. The electronic band models and defect states are also dealt with. The essentials of electrical switching behavior of chalcogenides are discussed suggesting the electronic nature of switching and the role of thermal properties on switching. Chapter 2: The second chapter essentially deals with theory and practice of the experimental techniques adopted in the thesis work. The details of the melt-quenching method of synthesizing glassy samples are provided. Considering the importance, the theory of thermal analysis by DSC & ADSC, are discussed in detail, highlighting the advantages of the latter method adopted in the thesis work. The instrumentation and electronics, developed and used for electrical switching analysis are also introduced at a… Advisors/Committee Members: Asokan, S.

Subjects/Keywords: Glasses - Electric Switching Properties; Glasses - Electric Properties - Instrumentation; Glassy Chalcogenides; Glasses - Thermal Properties; Amorphous Semiconductors; Glass Forming Ability (GFA); High Voltage Electrical Switching Analyzer; GexSe35-xTe65 Glasses; Se-Te Glasses; Applied Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prashanth, S. B. B. (2008). Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/735

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prashanth, S B Bhanu. “Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides.” 2008. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/735.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prashanth, S B Bhanu. “Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides.” 2008. Web. 09 Dec 2019.

Vancouver:

Prashanth SBB. Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides. [Internet] [Thesis]. Indian Institute of Science; 2008. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/735.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prashanth SBB. Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides. [Thesis]. Indian Institute of Science; 2008. Available from: http://hdl.handle.net/2005/735

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

15. Das, Chandasree. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.

Degree: 2011, Indian Institute of Science

URL: http://hdl.handle.net/2005/2378

► Chalcogenide glass based Phase Change Memories (PCMs) are being considered recently as promising alternatives to conventional non-volatile Random Access Memories (NVRAMs). PCMs offer high performance… (more)

▼ Chalcogenide glass based Phase Change Memories (PCMs) are being considered recently as promising alternatives to conventional non-volatile Random Access Memories (NVRAMs). PCMs offer high performance & low power consumption, in addition to other advantages, such as high scalability, high endurance and compatibility with complementary metal oxide semiconductors (CMOS) technologies. Basically PCM is a resistance variable non-volatile memory in which the memory bit state is defined by the resistance of the material. In this case, the initial ‘OFF’ state (logic zero) corresponds to the high resistance amorphous state and the logic 1 or ‘ON’ state corresponds to low resistance crystalline state. The present thesis work deals with electrical, thermal, mechanical and optical characterization of certain tellurium based chalcogenide glasses in bulk and thin film form for phase change memory applications. A comparative study has been done on the electrical switching behavior of Ge-Te-Se & Ge-Te-Si amorphous thin film samples with their bulk counterparts. Further, electrical switching and thermal studies have been undertaken on bulk Ge-Te-Bi and Ge-Te-Sn series of samples. The composition dependence of switching voltages of bulk and thin film samples studied has been explained on the basis of different factors responsible for electrical switching. The thesis contains ten chapters: Chapter 1 deals with a brief introduction on chalcogenides and their applicability in phase change memories. The glass transition phenomenon, synthesis of chalcogenide alloys, different structural models of amorphous semiconductors and electrical switching behavior are also discussed in detail in this chapter. Further, a brief description of optical and mechanical properties along with the principles of few characterization techniques used is discussed. Also, a brief overview on PCM application of chalcogenides is presented. The second chapter provides the details of various experimental techniques used to measure electrical, thermal, optical and mechanical properties of few tellurium based chalcogenide glassy systems. In the third chapter, the electrical switching behavior of amorphous Al23Te77 thin film devices, deposited in co-planar geometry, has been discussed. It is found that these samples exhibit memory type electrical switching. Scanning Electron Microscopic studies show the formation of a crystalline filament in the electrode region which is responsible for switching of the device from high resistance OFF state to low resistance ON state. The switching behavior of thin film Al-Te samples is found to be similar to that of bulk samples, with the threshold fields of bulk samples being higher. This has been understood on the basis of higher thermal conductance in bulk, which reduces the Joule heating and temperature rise in the electrode region. Electrical switching and thermal behavior of bulk; melt quenched Ge18Te82-xBix glasses (1 ≤ x ≤ 4) are presented in chapter 4. Ge-Te-Bi glasses have been found to exhibit memory type electrical… Advisors/Committee Members: Asokan, S, Rao, G Mohan.

Subjects/Keywords: Chalcogenide Glasses; Phase Change Memory (PCM); Thin Film Instruments; Chalcogenide Thin Films; Chalcogenide Glasses - Electrical Switching; Chalcogenide Glasses - Optical Properties; Tellurium Chalcogenide Glasses; Chalcogenide Glasses - Thermal Properties; Ge-Te-Bi Glasses; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Das, C. (2011). Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2378

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Das, Chandasree. “Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.” 2011. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2378.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Das, Chandasree. “Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.” 2011. Web. 09 Dec 2019.

Vancouver:

Das C. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2378.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Das C. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. [Thesis]. Indian Institute of Science; 2011. Available from: http://hdl.handle.net/2005/2378

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

16. Prakash, S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.

Degree: 1996, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/1704 ; http://etd.ncsi.iisc.ernet.in/abstracts/2197/G14777-Abs.pdf

Subjects/Keywords: Amorphous Semiconductors Switching; Melt Quenching; Electric Switches; Semiconductors; Chalcogenides Semiconductors; Ge-As-Te Glasses; Applied Physics

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prakash, S. (1996). Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/1704 ; http://etd.ncsi.iisc.ernet.in/abstracts/2197/G14777-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prakash, S. “Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.” 1996. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/1704 ; http://etd.ncsi.iisc.ernet.in/abstracts/2197/G14777-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prakash, S. “Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications.” 1996. Web. 09 Dec 2019.

Vancouver:

Prakash S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. [Internet] [Thesis]. Indian Institute of Science; 1996. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/1704 ; http://etd.ncsi.iisc.ernet.in/abstracts/2197/G14777-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prakash S. Electrical Switching Investigations To Design Amorphous Semiconductors For Device Applications. [Thesis]. Indian Institute of Science; 1996. Available from: http://etd.iisc.ernet.in/handle/2005/1704 ; http://etd.ncsi.iisc.ernet.in/abstracts/2197/G14777-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

17. Das, Chandasree. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.

Degree: 2011, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/2378 ; http://etd.ncsi.iisc.ernet.in/abstracts/3061/G25140-Abs.pdf

► Chalcogenide glass based Phase Change Memories (PCMs) are being considered recently as promising alternatives to conventional non-volatile Random Access Memories (NVRAMs). PCMs offer high performance… (more)

▼ Chalcogenide glass based Phase Change Memories (PCMs) are being considered recently as promising alternatives to conventional non-volatile Random Access Memories (NVRAMs). PCMs offer high performance & low power consumption, in addition to other advantages, such as high scalability, high endurance and compatibility with complementary metal oxide semiconductors (CMOS) technologies. Basically PCM is a resistance variable non-volatile memory in which the memory bit state is defined by the resistance of the material. In this case, the initial ‘OFF’ state (logic zero) corresponds to the high resistance amorphous state and the logic 1 or ‘ON’ state corresponds to low resistance crystalline state. The present thesis work deals with electrical, thermal, mechanical and optical characterization of certain tellurium based chalcogenide glasses in bulk and thin film form for phase change memory applications. A comparative study has been done on the electrical switching behavior of Ge-Te-Se & Ge-Te-Si amorphous thin film samples with their bulk counterparts. Further, electrical switching and thermal studies have been undertaken on bulk Ge-Te-Bi and Ge-Te-Sn series of samples. The composition dependence of switching voltages of bulk and thin film samples studied has been explained on the basis of different factors responsible for electrical switching. The thesis contains ten chapters: Chapter 1 deals with a brief introduction on chalcogenides and their applicability in phase change memories. The glass transition phenomenon, synthesis of chalcogenide alloys, different structural models of amorphous semiconductors and electrical switching behavior are also discussed in detail in this chapter. Further, a brief description of optical and mechanical properties along with the principles of few characterization techniques used is discussed. Also, a brief overview on PCM application of chalcogenides is presented. The second chapter provides the details of various experimental techniques used to measure electrical, thermal, optical and mechanical properties of few tellurium based chalcogenide glassy systems. In the third chapter, the electrical switching behavior of amorphous Al23Te77 thin film devices, deposited in co-planar geometry, has been discussed. It is found that these samples exhibit memory type electrical switching. Scanning Electron Microscopic studies show the formation of a crystalline filament in the electrode region which is responsible for switching of the device from high resistance OFF state to low resistance ON state. The switching behavior of thin film Al-Te samples is found to be similar to that of bulk samples, with the threshold fields of bulk samples being higher. This has been understood on the basis of higher thermal conductance in bulk, which reduces the Joule heating and temperature rise in the electrode region. Electrical switching and thermal behavior of bulk; melt quenched Ge18Te82-xBix glasses (1 ≤ x ≤ 4) are presented in chapter 4. Ge-Te-Bi glasses have been found to exhibit memory type electrical… Advisors/Committee Members: Asokan, S, Rao, G Mohan.

Subjects/Keywords: Chalcogenide Glasses; Phase Change Memory (PCM); Thin Film Instruments; Chalcogenide Thin Films; Chalcogenide Glasses - Electrical Switching; Chalcogenide Glasses - Optical Properties; Tellurium Chalcogenide Glasses; Chalcogenide Glasses - Thermal Properties; Ge-Te-Bi Glasses; Materials Science

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Das, C. (2011). Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2378 ; http://etd.ncsi.iisc.ernet.in/abstracts/3061/G25140-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Das, Chandasree. “Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.” 2011. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/2378 ; http://etd.ncsi.iisc.ernet.in/abstracts/3061/G25140-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Das, Chandasree. “Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications.” 2011. Web. 09 Dec 2019.

Vancouver:

Das C. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/2378 ; http://etd.ncsi.iisc.ernet.in/abstracts/3061/G25140-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Das C. Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications. [Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ernet.in/handle/2005/2378 ; http://etd.ncsi.iisc.ernet.in/abstracts/3061/G25140-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

18. Femi, Olu Emmanuel. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.

Degree: 2015, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/2655 ; http://etd.ncsi.iisc.ernet.in/abstracts/3466/G26868-Abs.pdf

► Climate change is a subject of deep distress in today’s world. Over dependence on hydrocarbon has resulted in serious environmental problems. Rising sea level, global… (more)

▼ Climate change is a subject of deep distress in today’s world. Over dependence on hydrocarbon has resulted in serious environmental problems. Rising sea level, global warming and ozone layer depletion are the mainstream of any discuss world over. The collective goal of cutting carbon emission by the year 2020has prompted the search for clean, alternative energy sources. This effort are already yielding good reward as other forms of energy such as solar, wind, nuclear and hydro have received huge investment and renew interest over the past decade. Thermoelectric materials over the past decades have been tipped to replace conventional means of power generations as these materials have the ability to convert heat to electrical energy and vice versa. They are simple, have no moving parts and use no greenhouse gases. But the major drawback of these materials is their low conversion efficiency. Hence there is a need to enhance the efficiency of thermoelectric material to fulfill their undeniable potentials. A parameter called the thermoelectric figure of merit, ZT defines the efficiency of a thermoelectric material. ZT relates three non-mutually exclusive transport properties namely Seebeck coefficient, electrical conductivity and thermal conductivity. Efficient thermoelectric material should possess high Seebeck coefficient, high electrical conductivity and low thermal conductivity. Hence, one of the interesting ideas in the area of thermoelectric research is the concept of designing a bulk material with high density of phonon scattering centers so has to reduce the lattice contribution to thermal conductivity but at the same time have minimum impact oncharge carriers. This is usually achieved by utilizing interphase and grain boundaries which are localized defects to scatter phonons. The volume fraction of the grain/interphase boundaries can be control through phase modification and microstructure design. This thesis is centered on Bi-Sb-Te systems which are the present room temperature state of the earth thermoelectric material. The investigation revolves around developing a new kind of microstructure in the well-studied Bi-Sb-Te system that shows tremendous potential as a means to reduce lattice contribution to thermal conductivity. The idea of having both p and n-type thermoelectric material preferably from the same material was also a motivation in our investigation. The thesis isdivided into six chapters. The first chapter introduces the concept of thermoelectricity i.e. the direct conversion of thermal energy into electricity. The physics involved and contribution of individual to the science of thermoelectricity were enumerated. Efficiency, optimization and material selection for better thermoelectric performance were briefly enumerated. Prospective materials that are currently been investigated for better thermoelectric properties were also mentioned. The structure of the Bi-Sb-Te system which is the focus of this thesis is present in this chapter including doping effect on the thermoelectric performance… Advisors/Committee Members: Chattopadhyay, K, Ravishankar, N.

Subjects/Keywords: Thermoelectric Materials; Alternative Energy Sources; Semiconductors; Thermoelectricity; Bismuth-Antimony-Tellurium Systems; Thermoelectric Figure of Merit; BiSbTe Thermoelectric Materials; Seebeck Effect; Thermoelectric Nanomaterials; BISbTe Microstructure; Thermal Conductivity; Non-Ferrous Metal Systems; Bi-Sb-Te System; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Femi, O. E. (2015). Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/2655 ; http://etd.ncsi.iisc.ernet.in/abstracts/3466/G26868-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Femi, Olu Emmanuel. “Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.” 2015. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/2655 ; http://etd.ncsi.iisc.ernet.in/abstracts/3466/G26868-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Femi, Olu Emmanuel. “Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.” 2015. Web. 09 Dec 2019.

Vancouver:

Femi OE. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. [Internet] [Thesis]. Indian Institute of Science; 2015. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/2655 ; http://etd.ncsi.iisc.ernet.in/abstracts/3466/G26868-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Femi OE. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. [Thesis]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ernet.in/handle/2005/2655 ; http://etd.ncsi.iisc.ernet.in/abstracts/3466/G26868-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

19. Femi, Olu Emmanuel. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.

Degree: 2015, Indian Institute of Science

URL: http://hdl.handle.net/2005/2655

► Climate change is a subject of deep distress in today’s world. Over dependence on hydrocarbon has resulted in serious environmental problems. Rising sea level, global… (more)

▼ Climate change is a subject of deep distress in today’s world. Over dependence on hydrocarbon has resulted in serious environmental problems. Rising sea level, global warming and ozone layer depletion are the mainstream of any discuss world over. The collective goal of cutting carbon emission by the year 2020has prompted the search for clean, alternative energy sources. This effort are already yielding good reward as other forms of energy such as solar, wind, nuclear and hydro have received huge investment and renew interest over the past decade. Thermoelectric materials over the past decades have been tipped to replace conventional means of power generations as these materials have the ability to convert heat to electrical energy and vice versa. They are simple, have no moving parts and use no greenhouse gases. But the major drawback of these materials is their low conversion efficiency. Hence there is a need to enhance the efficiency of thermoelectric material to fulfill their undeniable potentials. A parameter called the thermoelectric figure of merit, ZT defines the efficiency of a thermoelectric material. ZT relates three non-mutually exclusive transport properties namely Seebeck coefficient, electrical conductivity and thermal conductivity. Efficient thermoelectric material should possess high Seebeck coefficient, high electrical conductivity and low thermal conductivity. Hence, one of the interesting ideas in the area of thermoelectric research is the concept of designing a bulk material with high density of phonon scattering centers so has to reduce the lattice contribution to thermal conductivity but at the same time have minimum impact oncharge carriers. This is usually achieved by utilizing interphase and grain boundaries which are localized defects to scatter phonons. The volume fraction of the grain/interphase boundaries can be control through phase modification and microstructure design. This thesis is centered on Bi-Sb-Te systems which are the present room temperature state of the earth thermoelectric material. The investigation revolves around developing a new kind of microstructure in the well-studied Bi-Sb-Te system that shows tremendous potential as a means to reduce lattice contribution to thermal conductivity. The idea of having both p and n-type thermoelectric material preferably from the same material was also a motivation in our investigation. The thesis isdivided into six chapters. The first chapter introduces the concept of thermoelectricity i.e. the direct conversion of thermal energy into electricity. The physics involved and contribution of individual to the science of thermoelectricity were enumerated. Efficiency, optimization and material selection for better thermoelectric performance were briefly enumerated. Prospective materials that are currently been investigated for better thermoelectric properties were also mentioned. The structure of the Bi-Sb-Te system which is the focus of this thesis is present in this chapter including doping effect on the thermoelectric performance… Advisors/Committee Members: Chattopadhyay, K, Ravishankar, N.

Subjects/Keywords: Thermoelectric Materials; Alternative Energy Sources; Semiconductors; Thermoelectricity; Bismuth-Antimony-Tellurium Systems; Thermoelectric Figure of Merit; BiSbTe Thermoelectric Materials; Seebeck Effect; Thermoelectric Nanomaterials; BISbTe Microstructure; Thermal Conductivity; Non-Ferrous Metal Systems; Bi-Sb-Te System; Materials Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Femi, O. E. (2015). Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2655

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Femi, Olu Emmanuel. “Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.” 2015. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2655.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Femi, Olu Emmanuel. “Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System.” 2015. Web. 09 Dec 2019.

Vancouver:

Femi OE. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. [Internet] [Thesis]. Indian Institute of Science; 2015. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2655.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Femi OE. Microstructure Design And Interfacial Effects On Thermoelectric Properties Of Bi-Sb-Te System. [Thesis]. Indian Institute of Science; 2015. Available from: http://hdl.handle.net/2005/2655

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

20. Karuppuswamy, C. Bidirectional Invertor With High Frequency Ac Link.

Degree: 2009, Indian Institute of Science

URL: http://hdl.handle.net/2005/877

► It is customary to obtain ac power from batteries through a power converter, where mains ac power is not readily available. Such a power converter… (more)

▼ It is customary to obtain ac power from batteries through a power converter, where mains ac power is not readily available. Such a power converter is also needed in several mobile/ airborne/ space applications. Till recently this application is served by a H bridge inverter followed by a low frequency transformer and a passive low pass filter. The H bridge inverter employs high frequency pulse width modulation. The transformer is made of standard silicon steel. The filter is made of L and C elements. In such a converter the magnetics account for about 30% of cost and 50% of weight. Moreover the dc input current in such converters is discontinuous, leading to poor efficiency. There is need for an input filter as well. This thesis presents the development of an inverter with high frequency (hf) link. The power converter employs a boost front end resulting in continuous input current. The H bridge inverter employs phase modulation technique with soft switching features. The boost converter and the H bridge share power devices. The isolation transformer handles high frequency ac power and is compact. It is shown that the transformer size can be reduced by more than one order of magnitude. There is a rear end cycloconverter to reconvert the high frequency ac power into 50 Hz output power. Innovative pulse sequencing in the cycloconverter ensures loss-less switching. The pulse width modulation shifts the dominant harmonic frequency to double the switching frequency. The output LC filter is light. The converter can handle bidirectional power. The controller is digital. The overall concept was demonstrated through the 500 W prototype design. The proposed topology offers small size, low losses and continous input current. The controller is digital and offers totally software based compensation and settings. It is expected that on account of the small size and cost, this topology is likely to become more popular in the near future. The applications of such power converters will bring down the size and cost of UPS, solar inverters, wind mill inverters etc. Advisors/Committee Members: Ramanarayanan, V.

Subjects/Keywords: Electric Inverters; Electric Converter; High Frequency Ac Link; Power Converters; Digital Controllers; Cycloconverter; H Bridge Inverter; HF-Transformer; Electrical Engineering

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APA (6^th Edition):

Karuppuswamy, C. (2009). Bidirectional Invertor With High Frequency Ac Link. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Karuppuswamy, C. “Bidirectional Invertor With High Frequency Ac Link.” 2009. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Karuppuswamy, C. “Bidirectional Invertor With High Frequency Ac Link.” 2009. Web. 09 Dec 2019.

Vancouver:

Karuppuswamy C. Bidirectional Invertor With High Frequency Ac Link. [Internet] [Thesis]. Indian Institute of Science; 2009. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Karuppuswamy C. Bidirectional Invertor With High Frequency Ac Link. [Thesis]. Indian Institute of Science; 2009. Available from: http://hdl.handle.net/2005/877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

21. Dethe, Dattatraya Hanumant. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.

Degree: 2005, Indian Institute of Science

URL: http://hdl.handle.net/2005/1554

Subjects/Keywords: Terpenes; Cucumin; Taxanes; Pacifigorgianes; Cucumin-H; Organic Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dethe, D. H. (2005). Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dethe, Dattatraya Hanumant. “Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.” 2005. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/1554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dethe, Dattatraya Hanumant. “Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.” 2005. Web. 09 Dec 2019.

Vancouver:

Dethe DH. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. [Internet] [Thesis]. Indian Institute of Science; 2005. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/1554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dethe DH. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. [Thesis]. Indian Institute of Science; 2005. Available from: http://hdl.handle.net/2005/1554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

22. Dethe, Dattatraya Hanumant. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.

Degree: 2005, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/1554 ; http://etd.ncsi.iisc.ernet.in/abstracts/1985/G19183-Abs.pdf

Subjects/Keywords: Terpenes; Cucumin; Taxanes; Pacifigorgianes; Cucumin-H; Organic Chemistry

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dethe, D. H. (2005). Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/1554 ; http://etd.ncsi.iisc.ernet.in/abstracts/1985/G19183-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dethe, Dattatraya Hanumant. “Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.” 2005. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/handle/2005/1554 ; http://etd.ncsi.iisc.ernet.in/abstracts/1985/G19183-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dethe, Dattatraya Hanumant. “Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes.” 2005. Web. 09 Dec 2019.

Vancouver:

Dethe DH. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. [Internet] [Thesis]. Indian Institute of Science; 2005. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/handle/2005/1554 ; http://etd.ncsi.iisc.ernet.in/abstracts/1985/G19183-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dethe DH. Enantiospecific Syntheses Of Cucumin-H, Pacifigorgianes And BC-Ring System Of Taxanes. [Thesis]. Indian Institute of Science; 2005. Available from: http://etd.iisc.ernet.in/handle/2005/1554 ; http://etd.ncsi.iisc.ernet.in/abstracts/1985/G19183-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

23. Nallapati, Lakshmi Aparna. Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond.

Degree: 2015, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3867 ; http://etd.iisc.ernet.in/abstracts/4739/G27117-Abs.pdf

► This thesis entitled “Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations Using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen… (more)

▼ This thesis entitled “Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations Using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond” is divided into six chapters. Chapter 1: Introduction to Ordered Conformations of Peptides and Strategies for Constraining Short Peptides in Ordered Conformations. The first chapter describes the different types of protein secondary structures and introduces the various prominent strategies developed thus far to constrain short peptides in ordered secondary structure-like conformations, with specific emphasis on helical and parallel β-sheet folds. Chapter 2: Design of Structure and General Methodology for the synthesis of Novel H-Bond Surrogate Constrained Cyclic α-Helical Mimics Here we develop the first design of the propyl linker as a covalent surrogate for the peptide H-bond. The first synthetic methodology is described for the synthesis of constraining shortest peptide sequences (tripeptides) in α-helix-like conformations. The Macrolactamization strategy proved to work best as the final step for cyclization. All residues of the turn are completely retained in the constrained sequence, unlike any other earlier method. More importantly, there are no metal involved as catalysts in any of the synthetic transformations, hence removing the problem of metal-bound cyclic structures – which have otherwise rendered these structures non-usable as drug leads in the earlier models. Gly-rich peptides have been constrained as extreme cases of highest chain entropy and least helix propensity. Both secondary and tertiary amide containing peptides have been synthesized using this protocol. Note that the macrolactamization was found to be better than the Fukuyama-Mitsunobu N-alkylation protocol for the final cyclization step. Chapter 3: Synthesis of C-terminal Extended HBS-Constrained Helical Turn Mimics – Validation of the Versatility of Current synthetic protocol The developed cyclization protocol is extended towards the synthesis of C-terminal extended α-helical turn mimics using a solution phase peptide synthesis procedure. Peptides which extend belong the helical turn by a high entropy Gly-residue at the C-terminal are synthesized. The versatility of the synthetic methodology to accommodate sterically constrained amino acid residues – in the form of phenylalanine residue – at any of the positions i+1, i+2 or i+3 of the constrained helical turn is demonstrated. The synthesized are easily isolated without need for column chromatography, in high purity and good yields – this is due to the presence of the N-terminal amino group, salts of which are easily triturated to remove all other organic impurities. Chapter 4: Synthesis and CD conformational analyses of HBS constrained α-Helical turn mimics containing residues with improved helical propensities Alanine residue has the highest helix propensity among all other natural α-amino acid residues. Its enthalpic contribution to the helical conformation is 1 kcal/mol more than that for the Gly residue,… Advisors/Committee Members: Prabhakaran, N.

Subjects/Keywords: Peptidomimics; Peptide - Novel Covalent Surrogate; Novel H-Bond Surrogate; Cyclic α-Helical Mimics; Peptide Mimics; Helical Turn Mimics; Organic Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nallapati, L. A. (2015). Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3867 ; http://etd.iisc.ernet.in/abstracts/4739/G27117-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nallapati, Lakshmi Aparna. “Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond.” 2015. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/2005/3867 ; http://etd.iisc.ernet.in/abstracts/4739/G27117-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nallapati, Lakshmi Aparna. “Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond.” 2015. Web. 09 Dec 2019.

Vancouver:

Nallapati LA. Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond. [Internet] [Thesis]. Indian Institute of Science; 2015. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/2005/3867 ; http://etd.iisc.ernet.in/abstracts/4739/G27117-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nallapati LA. Design and Synthesis of Peptidomimics Constrained in Helical and Sheet Conformations using a Novel Covalent Surrogate for the Peptide Main Chain Hydrogen Bond. [Thesis]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ernet.in/2005/3867 ; http://etd.iisc.ernet.in/abstracts/4739/G27117-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

24. Dutta, Saikat. Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center.

Degree: 2008, Indian Institute of Science

URL: http://hdl.handle.net/2005/754

► The binding of molecular hydrogen to a metal center leads to the elongation of the H−H bond and subsequently to its cleavage along the reaction… (more)

▼ The binding of molecular hydrogen to a metal center leads to the elongation of the H−H bond and subsequently to its cleavage along the reaction coordinate for the oxidative addition of H2. There has been considerable interest in the study of the activation of dihydrogen and map out the reaction coordinate for the homolysis of H2 on a metal center. A large number of H2 complexes reported to date possess H−H distances ranging from 0.8 to 1.0 Å. A relatively fewer examples of elongated dihydrogen complexes wherein the H−H distances fall in the range of 1.0 to 1.5 Å, are known. Study of the elongated dihydrogen complexes is of great significance because of its relevance in important catalytic processes such as hydrogenation, hydrogenolysis, and hydroformylation. Objectives The objectives of this work are as follows: (a) Synthesis and characterization of elongated dihydrogen complexes with chelating phosphine coligands by varying the electron donor ability. (b) Trap the various intermediate states in the process of oxidative addition of H2 to a metal center. (c) Map the reaction coordinate for the oxidative addition for the oxidative addition of H2 to a metal center. Results We have synthesized and characterized two new elongated dihydrogen complexes cis-[Ir(H)(η2-S2CH)(η2-H2)(PR3)2][BF4] (PR3 = PCy3, PPh3) wherein hydrogen atom undergoes site exchange between the H2 and the hydride sites. The dynamics of the exchange was studied using NMR spectroscopy. In addition, a series of ruthenium dihydrogen complexes of the type trans-[Ru(Cl)(η2-H2)(PP)][BF4] (PP = 1,2- Synopsis bis(diarylphosphino)ethane) has been synthesized and characterized wherein the aryl group is a benzyl moiety with a substituent (p-fluoro, H, m-methyl, p-methyl, p-isopropyl); in this series of complexes, a small increment in the electron donor ability (decrease in Hammett substituent constants) of the chelating phosphine ligand resulted in an elongation of the H−H bond by a small, yet significant amount. We also synthesized a series of 16-electron dicationic dihydrogen complexes bearing elongated dihydrogen ligand. In addition, we prepared a series of dihydrogen complexes of the type [RuCp/Cp*(PP)(η2-H2)][OTf] (PP = 1,2-bis(diarylphosphino)ethane, 1,2-bis(diarylphosphino)methane, 1,2-bis(dialkylphosphino)methane) bearing elongated H2 ligand (dHH = 1.0 to 1.17 Å); in this series of complexes as well, we found that the H−H bond distances increased as the donor ability of the chelating phosphines increased in small increments, along the reaction coordinate for the oxidative addition of H2 to a metal center. This investigation therefore, has established a very nice correlation between the H−H bond lengths and the Hammett substitutent constants (donor properties) resulting in the construction of dihydrogen complexes along the reaction coordinate for the oxidative addition of H2 to a metal center. Advisors/Committee Members: Jagirdar, Balaji R.

Subjects/Keywords: Hydrolysis Reactions; Hydride Complexes; Chelating Phosphine Ligand; H-H Bond Elongation; Iridium Dihydrogen Complexes; Ruthenium Dihydrogen Complexes; Elongated Dihydrogen Complexes; Electron Dictationic Dihydrogen Complexes; Transition Metal Dihydrogen Complexes; Molecular Hydrogen - Binding; Metal Center; Elongated H2 Complexes; Iridium; Phosphine Coligands; Elongated Dihydrogen Ligands; Dihydrogen/Hydride Complex; Physical Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dutta, S. (2008). Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/754

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dutta, Saikat. “Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center.” 2008. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/754.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dutta, Saikat. “Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center.” 2008. Web. 09 Dec 2019.

Vancouver:

Dutta S. Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center. [Internet] [Thesis]. Indian Institute of Science; 2008. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/754.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dutta S. Mapping The Reaction Coordinate For The Oxidative Addition Of Molecular Hydrogen To A Metal Center. [Thesis]. Indian Institute of Science; 2008. Available from: http://hdl.handle.net/2005/754

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

25. Viju Nair, R. Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives.

Degree: 2018, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/4005 ; http://etd.iisc.ernet.in/abstracts/4899/G28514-Abs.pdf

► Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high… (more)

▼ Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high quality. For achieving this, it had to switch at high frequencies and also the switching is between 0 and Vdc. Also additional LC filters are required before feeding to a motor. 3-phase IM is the work horse of the industry. Several speed control techniques have been established namely the V/f control technique and for high performance, vector control is adopted. An electric drive system comprises of a rectifier, inverter, a motor and a load. each module is a topic by itself. This thesis work discusses the novel inverter topologies to overcome the demerits of a conventional 2-level inverter or even the basic multilevel topologies, for an electric drive. The word ‘multilevel’ itself signifies that inverter can generate more than two levels. The idea was first originated by Nabae, Takahashi and Akagi to bring an additional voltage level so that the waveform becomes a quasi square wave. This additional voltage level brought additional benefits in terms of reduced dv/dt and requirement of low switching frequency. But this was not without any cost. The inverter structure is slightly more complicated than a 2-level and also required more devices. But the advantage it gave was superior enough to such an extent that the above topology (popularly known as NPC) has become quite popular in industry. This topology was later modified to equalize the semiconductor losses among switches by replacing the clamping diodes with controllable switches and such topologies are popularly known as Active NPCs (ANPCs) because of the replacement of diodes with active switches. 3-level flying capacitors were then introduced where the additional voltage level is provided using charged capacitors. But this capacitor voltage has to be maintained at its nominal value during the inverter operation. An additional floating capacitor, which is an electrolytic capacitor is needed for this. Increasing the number of electrolytic capacitors reduces the reliability of the inverter drive since they are the weakest link in any inverters and its count has to be kept to the minimum. By using a H-bridge cell in each of the three phases, three voltage levels can be easily obtained.This is commonly known as Cascaded H-bridge (CHB) multilevel inverter. The above three topologies have been discussed with respect to generation of three pole voltage levels and these topologies are quite suited also. A higher number of voltage levels will reduce the switching frequency even lesser and also the dv/dt. On increasing the number of levels further and further, finally the inverter need not do any PWM switching and just generating the levels is sufficient enough for a good quality waveform and also low dv/dt. But when the above topologies are scaled for more than three voltage levels, all of them suffer serious drawbacks which is briefly discussed below. The diode clamped inverter (known as NPC if it is… Advisors/Committee Members: Gopakumar, K.

Subjects/Keywords: Multilevel Inverter Topology; Induction Motor Drives; H-bridge Cells; 2-level Inverter; Two-level Inverter; IM Drives; Neutral Point Voltage Balancing; Flying Capacitors; Cascaded H-bridge (CHB) Multilevel Inverter; Electronic Sytems Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Viju Nair, R. (2018). Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/4005 ; http://etd.iisc.ernet.in/abstracts/4899/G28514-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Viju Nair, R. “Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives.” 2018. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://etd.iisc.ernet.in/2005/4005 ; http://etd.iisc.ernet.in/abstracts/4899/G28514-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Viju Nair, R. “Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives.” 2018. Web. 09 Dec 2019.

Vancouver:

Viju Nair R. Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives. [Internet] [Thesis]. Indian Institute of Science; 2018. [cited 2019 Dec 09]. Available from: http://etd.iisc.ernet.in/2005/4005 ; http://etd.iisc.ernet.in/abstracts/4899/G28514-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Viju Nair R. Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives. [Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ernet.in/2005/4005 ; http://etd.iisc.ernet.in/abstracts/4899/G28514-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

26. Shivaleela, E S. Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks.

Degree: 2006, Indian Institute of Science

URL: http://hdl.handle.net/2005/323

► Asynchronous multiplexing schemes are efficient than synchronous schemes, in a bursty traffic environment of multiple access local area network (LAN), as fixed bandwidth is not… (more)

▼ Asynchronous multiplexing schemes are efficient than synchronous schemes, in a bursty traffic environment of multiple access local area network (LAN), as fixed bandwidth is not allocated among the users and there is no access delay. Fiber- Optic Code-Division Multiple Access (FO-CDMA) is one such asynchronous multiplexing scheme suitable for high speed LAN networks. While FO-CDMA offers potential benefits it also faces challenges in three diverse areas which are 1) coding algorithms and schemes 2) advanced encoding and decoding hardware and 3) network architecture. In this thesis, as a solution to the first challenge, we propose the design and construction of a new family of codes, wavelength/time multiple-pulses-per-row (W/T MPR) codes. These codes have good cardinality, spectral efficiency and minimal cross-correlation values. Performance analysis of the W/T MPR codes is carried out and found to be superior to other codes. In unipolar 1-D Optical Orthogonal Codes (OOCs) proposed by Salehi et al., the ratio of code length/code weight grows rapidly as the number of users is increased for a reasonable weight. Hence, for a given pulse width, the data rate decreases or in other words for a given data rate very narrow pulses have to be used, because of which dispersion effects will be dominant. To overcome the drawbacks of non-linear effects in large spread sequences of 1-D unipolar codes in FO-CDMA networks, several two-dimensional codes have been proposed. Wavelength-time (W/T) encoding of the two-dimensional codes is practical in FO-CDMA networks. W/T codes reported so far can be classiﬁed mainly into two types: 1) hybrid sequences, where one type of sequence is crossed with another to improve the cardinality and correlation properties and 2) matrix codes, 1-D sequences converted to 2-D codes or 2-D codes by construc- tion, to reduce the ’time’ spread of the sequences/codes. Prime-hop and eqc/prime W/T hybrid codes have been proposed where one type of sequence is crossed with another to improve the cardinality and correlation properties. Other constructions deal with conversion of 1-D sequences to 2-D codes either by using Chinese remainder theorem or folding GoLomb rulers. W/T single-pulse-per-row (W/T SPR) codes are 2-D codes constructed using algebraic method Addition Modulo Group operation. Motivation for this work: To design a family of 2-D codes which have the design choice of length of one dimension over the other, and also have better cardinality, spectral efficiency and also low cross-correlation values (thereby have low BER) than that of the reported unipolar 2-D codes. In this thesis, we describe the design principles of W/T MPR codes, for in- coherent FO-CDMA networks, which have good cardinality, spectral efficiency and minimal cross-correlation values. Another feature of the W/T MPR codes is that the aspect ratio can be varied by trade oﬀ between wavelength and temporal lengths. We lay down the necessary conditions to be satisfied by W/T MPR codes to have minimal correlation values of unity. We… Advisors/Committee Members: Srinivas, T.

Subjects/Keywords: Code Division Multiple Access; Computer Networks; CDMA Networks; Wavelength/Time Multiple-Pulses-Per-Row Codes (W/T MPR); Fiber Optic CDMA Networks - Codes; Fiber Optic Code-Division Multiple Access (FO-CDMA); Time Encoder (TE); Frequency Encoder (FE); Fast Frequency Hopping Encoder (FFHE); Passive Router; Orthogonal Codes; Computer Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shivaleela, E. S. (2006). Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shivaleela, E S. “Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks.” 2006. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shivaleela, E S. “Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks.” 2006. Web. 09 Dec 2019.

Vancouver:

Shivaleela ES. Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks. [Internet] [Thesis]. Indian Institute of Science; 2006. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shivaleela ES. Design And Performance Analysis Of A New Family Of Wavelength/Time Codes For Fiber-Optic CDMA Networks. [Thesis]. Indian Institute of Science; 2006. Available from: http://hdl.handle.net/2005/323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

27. Raghavendra, B. Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene.

Degree: 2008, Indian Institute of Science

URL: http://hdl.handle.net/2005/851

► Atoms construct the molecules and molecules construct the material substances (with the exceptions as well, e.g.., metals, where atoms directly construct the material substances). Intermolecular… (more)

▼ Atoms construct the molecules and molecules construct the material substances (with the exceptions as well, e.g.., metals, where atoms directly construct the material substances). Intermolecular interactions play an important role in most of the branches of sciences, ranging from material sciences to biological sciences. Van der Waals interactions are weak intermolecular interactions while hydrogen bonding varies in strength from weak to strong (1 to 40 kcal/mol). The present work focuses on applying some theoretical methods (ab initio and Atoms in Molecules theory) on these interactions to differentiate them with physically meaningful parameters such as hydrogen bond radii and atoms in molecules theory parameters. 1)Defining and calculating H-bond radii have been done using atoms in molecules theory approach which can explain ruling out the presence or absence of an H-bond in an intermolecular interaction. 2) A blue-shift of 200 cm-1 for a weakly bound complex is unprecedented. Our studies on weakly bound complexes showed the blue-shift of 200 cm-1 for H3C•••CIF and shift has been found to be purely from the mixing of normal modes and not because of an interaction. 3)Methane, a symmetric top molecule can act both as H-bond acceptor and donor. The present work shows that methane is rather a better H-bond acceptor than a donor and all the calculated parameters are in favor of this description. 4) Microwave spectrometer is an ultimate tool (at least at present) for structural characterization of the weakly bound complexes accurately. The rotational spectrum of the weakly bound isotopomer weakly bound complexes accurately. The rotational spectrum of the weakly bound isotopomer 13CC5H6•••Ar, which is a symmetric top and gives only “B” rotational constant. Moreover, the A rotational constant of the complex is the same as the rotational constant for 13CC5H6, which has no dipole moment. C2H2 molecule is an astrophysically important molecule as it is present in asymptotic giant branch and T-type stars (Teff<3000K). Due to its various infrared active vibrational modes, C2H2 is one of the most important sources in cool stars. The production of C2H2 infrared spectroscopic data at high temperature is therefore essential to trace back physical characteristics of these objects and to model the radiative transfer in their envelope. The databases such as “HITRAN”, do not have enough data available for stimulating high temperature spectra. Keeping all these objectives in mind, high temperature emission spectrum of acetylene has been recorded around 3µm region of acetylene. Advisors/Committee Members: Arunan, E.

Subjects/Keywords: Acetylene - Spectroscopy; Intermolecular Interactions; Fourier Transform Infrared Spectroscopy; Van der Waals Interactions; Hydrogen Bond Interaction; Microwave Spectroscopy; Hydrogen-Bonding; Intermolecular Forces; H-bond; C2H2 Molecule; Chemical Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raghavendra, B. (2008). Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Raghavendra, B. “Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene.” 2008. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Raghavendra, B. “Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene.” 2008. Web. 09 Dec 2019.

Vancouver:

Raghavendra B. Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene. [Internet] [Thesis]. Indian Institute of Science; 2008. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Raghavendra B. Theoretical And Spectroscopic Studies On Weakly Bound Complexes And Acetylene. [Thesis]. Indian Institute of Science; 2008. Available from: http://hdl.handle.net/2005/851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

28. Siva Kumar, K. Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells.

Degree: 2010, Indian Institute of Science

URL: http://hdl.handle.net/2005/1422

► Multilevel voltage source inverters have been receiving more and more attention from the industry and academia as a choice for high voltage and high power… (more)

▼ Multilevel voltage source inverters have been receiving more and more attention from the industry and academia as a choice for high voltage and high power applications. The high voltage multilevel inverters can be constructed with existing low voltage semiconductor switches, which already have a mature technology for handling low voltages, thus improving the reliability of the overall inverter system. These multilevel inverters generate the output voltage in the form of multi-stepped waveform with smaller amplitude. This will result in less dv/dt at the motor inputs and electromagnetic interference (EMI) caused by switching is considerably less. Because of the multi-stepped waveform, the instantaneous error in the output voltage will be always less compared to the conventional two-level inverter output voltage. It will reduce the unwanted harmonic content in the output voltage, which will enable to switch the inverter at lower frequencies. Many interesting multi level inverter topologies are proposed by various research groups across the world from industry and academic institutions. But apart from the conventional 3-level NPC and H-bridge topology, others are not yet highly preferred for general high power drives applications. In this respect, two different five-level inverter topologies and one three-level inverter topology for high power induction motor drive applications are proposed in this work. Existing knowledge from published literature shows that, the three-level voltage space vector diagram can be generated for an open-end winding induction motor by feeding the motor phase windings with two two-level inverters from both sides. In such a configuration, each inverter is capable of assuming 8 switching states independent of the other. Therefore a total of 64 switching combinations are possible, whereas the conventional NPC inverter have 27 possible switching combinations. The main drawback for this configuration is that, it requires a harmonic filter or isolated voltage source to suppress the common mode currents through the motor phase winding. In general, the harmonic filters are not desirable because, it is expensive and bulky in nature. Some topologies have been presented, in the past, to suppress the common mode voltage on the motor phase windings when the both inverters are fed with a single voltage source. But these schemes under utilize the dc-link voltage or use the extra power circuit. The scheme presented in chapter-3 eliminates the requirement of harmonic filter or isolated voltage source to block the common mode current in the motor phase windings. Both the two-level inverters, in this scheme, are fed with the same voltage source with a magnitude of Vdc/2 where Vdc is the voltage magnitude requires for the NPC three-level inverter. In this scheme, the identical voltage profile winding coils (pole pair winding coils), in the four pole induction motor, are disconnected electrically and reconnected in two star groups. The isolated neutrals, provided by the two star groups, will not allow the… Advisors/Committee Members: Gopakumar, K.

Subjects/Keywords: Induction Motors; Inverters; H-Bridge Cells; Multilevel Voltage Source Inverters; Induction Motor Drives; Winding Induction Motor; Multi-Level Inverters; Multilevel Inverter Topologies; Induction Motor Drive; Heat Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Siva Kumar, K. (2010). Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1422

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Siva Kumar, K. “Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells.” 2010. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/1422.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Siva Kumar, K. “Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells.” 2010. Web. 09 Dec 2019.

Vancouver:

Siva Kumar K. Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/1422.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Siva Kumar K. Multilevel Voltage Space Vector Generation For Induction Motor Drives Using Conventional Two-Level Inverters And H-Bridge Cells. [Thesis]. Indian Institute of Science; 2010. Available from: http://hdl.handle.net/2005/1422

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

29. Sen, Saikat. From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings.

Degree: 2010, Indian Institute of Science

URL: http://hdl.handle.net/2005/2158

► (FOR FIGURES REFER THE MAIN PDF FILE) Supramoleculr chemistry, aptly termed by Lehn as the study of molecular sociology, is the chemistry of the intermolecular… (more)

▼ (FOR FIGURES REFER THE MAIN PDF FILE) Supramoleculr chemistry, aptly termed by Lehn as the study of molecular sociology, is the chemistry of the intermolecular bond, focusing on the structures and functions of “supermolecules” –chemical system formed by the association between two or more molecular components. While interrelated, this discipline forges beyond the domain of traditional molecular chemistry, which seeks to master the manipulation of the covalent bond between atoms and uncover the principle that governs the structures and properties of molecular species. Supramolecular chemistry assayas to blend the comprehensive resources of molecular chemistry with designed control of the intermolecular interactions to engineers supramolecular with features as well defined as those of the constituent molecular themselves. Not surprisingly, it has been stated that supramoleculars are to molecules and the intermolecular bond what molecules are to atoms and the covalent bond. In the realm of molecular crystals, the focus of supramolecular chemistry and indeed, the scope of the present thesis coverings with that of a rather recent, but rapidly emerging scientific discipline, namely crystal engineering. Coined nearly four decades ago in connection with photodimerization reaction in crystalline cinnamic acids, the term” crystal engineering” has since then broadened its expanse considerably and is, at present, most appropriately defined as“the understanding of intermolecular interactions in the context of crystal packing and the utilization of such understanding in the design of new solids with desired physical and chemical properties”. It would be befitting to remark that it is very pursuit (and more often than not, the elusive target) of being able to make functional solids by design that has allowed crystal engineering to evolve from an object of mere Scientific curiosity to a subject of tremendous utilization value. No proof for this assertion might be greater than that which lies in the fervent efforts put forth by pharmaceutical companies in understanding and controlling drug polymorphism, especially in the wake of the contemporary legal implications attendant with observing such a phenomenon. Polymorphism in molecular crystals results from the possibility of at least two different arrangements of the molecular of a given compound in the solid state and has therefore often been regarded as the” dark side” of crystal engineering. On one hand, polymorphism presents itself as an important probe in the study of structure-property relationship and allows elucidation of the varied macroscopic properties of the same molecule self-assembled in different crystalline environments. On the other hand, the phenomenon poses an implicit complication when predicating the product of a crystallization process forms the goal of a crystal engineering project. This is particularly true in case of crystal structure prediction (CSP) from the molecular structure of a given compound, where the experimentally obtained polymorphic modification… Advisors/Committee Members: Mehta, Goverdhan.

Subjects/Keywords: Molecular Structure; Supramolecular Chemistry; Polycyclic Compounds - Self-Assemblies; Polycyclitols; Polyhydroxylated Flustrates; Aminoalcohols; Intramolecular Hydrogen Bonding; Polyclitols; Amino Alcohol; Supermolecules; O-H-O Hydrogen Bond; Organic Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sen, S. (2010). From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sen, Saikat. “From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings.” 2010. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sen, Saikat. “From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings.” 2010. Web. 09 Dec 2019.

Vancouver:

Sen S. From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings. [Internet] [Thesis]. Indian Institute of Science; 2010. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sen S. From Molecular To Supramolecular : Probing Soild State Self-Assemblies Of Conformationally Locked Polycyclitols And Their Structural Siblings. [Thesis]. Indian Institute of Science; 2010. Available from: http://hdl.handle.net/2005/2158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

30. Banerjee, Arun. Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance.

Degree: 2011, Indian Institute of Science

URL: http://hdl.handle.net/2005/2420

► Enzyme DNA methylation is an important biochemical process that imprints DNA with additional information. DNA methylation is catalyzed by S-adenosyl-L-methionine (AdoMet)-dependent methyltraferases (MTases). Prokaryotic DNA… (more)

▼ Enzyme DNA methylation is an important biochemical process that imprints DNA with additional information. DNA methylation is catalyzed by S-adenosyl-L-methionine (AdoMet)-dependent methyltraferases (MTases). Prokaryotic DNA MTases are usually components of restriction-modification(R-M) systems that enable cells to resist propagation of foreign genomes that would otherwise kill them. Based on the position methyl group transfer on the bases in DNA, MTases are classified into two groups-exocyclic or amino MTases and endocyclic or ring MTases. The amino MTases methylate exocyclic amino nitrogen to form either N6-methyladenine or n4-methycytosine. N6-methyaladenine is mostly found in the genomes of bacteria, archaea protists and fungi. Helicobacter pylori is a gram-negative, flagellated, fastidious bacterium that colonizes the highly acidic environment of the gastric mucosa. Frequently and persistence of H.paylori infection in humans make it attractive model for studying the host- pathogen interaction mechanisms. Analysis of the genome sequence of H.pylori strains 26695, J99.HPAGI, and G27 revealed an abundance of restriction-modification (R-M) systems. Most of the R-M system genes are either conserved among the strains or specific to each strain. Strain specific genes are responsible for different phenotypes in several host adapted pathogens such as H.pylori. Many of the R-M gene homologues exhibit different usages of condon bias and lower G+C content from the average genes suggesting horizontal transfer of the R-M system genes in H. Pylori. Genome analysis of strain 26695 showed the presence of three putative type III R-M systems and hp0592-hp0593 constitutes one such type III R-M system. Based on the conserved motif arrangements, HP0593 MTases belongs to the subgroups of MTases. The amino acid sequence of HP0593 MTases has 38% sequence identity to Ecop11 MTases and EcoP151 MTase, both of which belongs to type IIIR-M systems therefore, it was important to study in detail previously unexplored role of this putative type III DNA MTase (HP0593) in H. Pylori. Investigation of methyltransferease activity and sequence specifically of putative DNA adenine MTase (HP0593) HP0593 (N6-adenine) - DNA MTase is a member of a type III R-M system in H. pylori strain 26695. HP0593 MTase has been cloned, over expressed and purified heterologously in Escherichia coli. Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) was carried out with purified HP0593 and profile showed a single peak with expected molecular mass of 70.6kDa. The protein was determined as-5.8. HP0593 MTase exits predominantly as monomer and a small fraction as dimer in solution as determined by size exclusion chromatography and glutaraldehyde cross-linking studies. The recognition sequence of the purified MTase was determined as 5’GCAG-3’ and the target base of methylation is adenine. Dot-blot assay using antibodies that reacted specifically with DNA containing m6A modification confirmed that HP0593 MTase is an adenine specific MTase.… Advisors/Committee Members: Rao, D N.

Subjects/Keywords: DNA Methyltransferase - Biochemistry; Helicobacter pylori 26695; DNA Adenine Methyltransferase; HP0593 Gene; H. pylori; Adenine Methyltransferase; DNA Adenine MTase; Type III R-M Systems; Bacteriology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Banerjee, A. (2011). Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/2420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Banerjee, Arun. “Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance.” 2011. Thesis, Indian Institute of Science. Accessed December 09, 2019. http://hdl.handle.net/2005/2420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Banerjee, Arun. “Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance.” 2011. Web. 09 Dec 2019.

Vancouver:

Banerjee A. Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance. [Internet] [Thesis]. Indian Institute of Science; 2011. [cited 2019 Dec 09]. Available from: http://hdl.handle.net/2005/2420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Banerjee A. Biochemical Characterization Of An Acid-Adaptive Type III DNA Methyltransferase From Helicobacter Pylori 26695 And Its Biological Significance. [Thesis]. Indian Institute of Science; 2011. Available from: http://hdl.handle.net/2005/2420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations