subject:(Phase transition)

1. Hollen, Shawna M. Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition.

Degree: PhD, Physics, 2013, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:320462/

► The superconductor-insulator transition (SIT) is a well-known phenomenon that is observed in many types of superconducting systems, including elemental films and high Tc superconductors. Ultrathin… (more)

▼ The superconductor-insulator transition (SIT) is a well-known phenomenon that is observed in many types of superconducting systems, including elemental films and high Tc superconductors. Ultrathin films provide a versatile platform from which to study this ubiquitous, and possibly universal, transition. Two different theoretical approaches have been made to describe the SIT in thin films. The first predicts that Cooper pairs (CPs) exist in the insulating phase, and the second proposes that the transition is driven by pair-breaking, yielding an insulator of localized single electrons. Recent experiments showing the existence of an insulating phase of localized CPs have provided significant support for the first mechanism. This CP insulating (CPI) phase exhibits dramatic transport features including a giant magnetoresistance (MR) peak. Previous work in the Valles lab found such a phase in ultrathin amorphous Bi films quench-condensed onto a substrate with a nanohoneycomb (NHC) hole array. The local Cooper pairing correlations of the CPI phase were evident from Little-Parks-like MR oscillations due to the hole array. This thesis describes investigations of the mechanism for CP localization and the emergence of the CPI phase in NHC films. There are three main results. First, the CPI phase appears to be induced in NHC films by the undulating surface of the substrate, which produces regular spatial variations in thickness that give rise to nanoscale CP islands. Second, the giant positive MR characteristic of the CPI phase emerges with increasing film thickness simultaneously with the MR oscillation signal, associated with local CP phase coherence. The insulating phases of the thinnest films and films in magnetic fields just beyond the MR peak likely consist of CPs totally localized to their islands. Third, amorphous holey films of uniform thickness do not exhibit a CPI phase. These films go from superconductors directly to fermionic insulators with decreasing thickness. These results lend further insight to the nature of the CPI phase and also require at least two classes of SITs: one that can describe the presence of a CPI phase and one that can describe a transition from a superconductor to a fermionic insulator. Advisors/Committee Members: Valles, James, Jr. (Director), Mitrovic, Vesna (Reader), Feldman, Dmitri (Reader).

Subjects/Keywords: quantum phase transition

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APA (6^th Edition):

Hollen, S. M. (2013). Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:320462/

Chicago Manual of Style (16^th Edition):

Hollen, Shawna M. “Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition.” 2013. Doctoral Dissertation, Brown University. Accessed September 22, 2019. https://repository.library.brown.edu/studio/item/bdr:320462/.

MLA Handbook (7^th Edition):

Hollen, Shawna M. “Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition.” 2013. Web. 22 Sep 2019.

Vancouver:

Hollen SM. Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition. [Internet] [Doctoral dissertation]. Brown University; 2013. [cited 2019 Sep 22]. Available from: https://repository.library.brown.edu/studio/item/bdr:320462/.

Council of Science Editors:

Hollen SM. Cooper Pair Localization in Thin Films near the Superconductor-Insulator Transition. [Doctoral Dissertation]. Brown University; 2013. Available from: https://repository.library.brown.edu/studio/item/bdr:320462/

Louisiana State University

2. Hu, Biao. Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration.

Degree: PhD, Physical Sciences and Mathematics, 2011, Louisiana State University

URL: etd-07052011-144312 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3909

► Correlated Electron Materials (CEMs) have attracted the attention of the materials community because the strong coupling between charge, lattice, orbital, and spin degrees of freedom… (more)

Subjects/Keywords: Phase transition; Crystal growth

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APA (6^th Edition):

Hu, B. (2011). Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-07052011-144312 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3909

Chicago Manual of Style (16^th Edition):

Hu, Biao. “Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration.” 2011. Doctoral Dissertation, Louisiana State University. Accessed September 22, 2019. etd-07052011-144312 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3909.

MLA Handbook (7^th Edition):

Hu, Biao. “Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration.” 2011. Web. 22 Sep 2019.

Vancouver:

Hu B. Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration. [Internet] [Doctoral dissertation]. Louisiana State University; 2011. [cited 2019 Sep 22]. Available from: etd-07052011-144312 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3909.

Council of Science Editors:

Hu B. Evolution of structural and physical properties of transition metal oxide Sr₃(Ru₁₋xMnx)₂O₇ (0 <̲ x >̲ 0.7) with Mn concentration. [Doctoral Dissertation]. Louisiana State University; 2011. Available from: etd-07052011-144312 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3909

University of Sydney

3. Arunasalam, Somasuntharam. Non-perturbative phenomena and the electroweak phase transition .

Degree: 2019, University of Sydney

URL: http://hdl.handle.net/2123/20768

► The aim of this thesis is to investigate various non-perturbative phenomena within and beyond the standard model and their implications on the electroweak phase transition.… (more)

Subjects/Keywords: Electroweak Phase Transition; Baryogenesis

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APA (6^th Edition):

Arunasalam, S. (2019). Non-perturbative phenomena and the electroweak phase transition . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/20768

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):

Arunasalam, Somasuntharam. “Non-perturbative phenomena and the electroweak phase transition .” 2019. Thesis, University of Sydney. Accessed September 22, 2019. http://hdl.handle.net/2123/20768.

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

MLA Handbook (7^th Edition):

Arunasalam, Somasuntharam. “Non-perturbative phenomena and the electroweak phase transition .” 2019. Web. 22 Sep 2019.

Vancouver:

Arunasalam S. Non-perturbative phenomena and the electroweak phase transition . [Internet] [Thesis]. University of Sydney; 2019. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/2123/20768.

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

Council of Science Editors:

Arunasalam S. Non-perturbative phenomena and the electroweak phase transition . [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/20768

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

4. Bruycker, Franck De. High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération.

Degree: Docteur es, Physique, 2010, Université d'Orléans

URL: http://www.theses.fr/2010ORLE2060

►

Il est important de bien connaitre le comportement des combustibles nucléaires dans des conditions extrêmes afin d’assurer la sureté des réacteurs et de prévoir les… (more)

▼

Il est important de bien connaitre le comportement des combustibles nucléaires dans des conditions extrêmes afin d’assurer la sureté des réacteurs et de prévoir les conséquences d’un éventuel accident. L’objectif principal de cette thèse est l’étude des transitions de phase à très haute température de matériaux envisagés pour les combustibles nucléaires de quatrième génération. Dans ce but, une méthode a été développée à l’institut européen des transuraniens (ITU) pour étudier ces matériaux à des températures excédant 2500K. La technique utilisée consiste à chauffer l’échantillon à l’aide d’un laser de haute puissance et à mesurer sa température par pyrométrie. Le signal d’un second laser réfléchi par la surface de l’échantillon est aussi étudié afin de mieux caractériser les transitions de phase. Les avantages de cette technique résident dans la rapidité des expériences (de quelques dizaines de ms à quelques secondes), et dans le contrôle de l’atmosphère, ce qui permet de limiter les effets d’évaporation ou d’oxydation/réduction de l’échantillon. Il convient de signaler que seule la partie centrale de l’échantillon est fondue, la phase liquide sondée est ainsi confinée au sein de l’échantillon lui-même, ce qui évite toute interaction avec le système de fixation. Nos résultats sur les carbures d’uranium sont en accord avec ceux de la littérature, et ont permis d’affiner le calcul des diagrammes de phase pour ces matériaux stables à haute température. La technique que nous avons mise au point a été utilisée, pour la première fois, pour étudier des matériaux de haute activité. Des résultats originaux ont été obtenus sur les systèmes PuO2, NpO2, UO2-PuO2 et Pu-C.

Understanding the behaviour of nuclear materials in extreme conditions is of prime importance for the analysis of the operation limits of nuclear fuels, and prediction of possible nuclear reactor accidents, relevant to the general objectives of nuclear safety research. The main purpose of this thesis is the study of high temperature phase transitions in nuclear materials, with special attention to the candidate fuel materials for the reactors of the 4th Generation. In this framework, material properties need to be investigated at temperatures higher than 2500K, where equilibrium conditions are difficult to obtain. Laser heating combined with fast pyrometer is the method used at the European Institute for Transuranium Elements (JRC – ITU). It is associated to a novel process used to determine phase transitions, based on the detection, via a suited low-power (mW) probe laser, of changes in surface reflectivity that may accompany solid/liquid phase transitions. Fast thermal cycles, from a few ms up to the second, under almost container-free conditions and control atmosphere narrow the problem of vaporisation and sample interactions usually meet with traditional method. This new experimental approach has led to very interesting results. It confirmed earlier research for material systems known to be stable at high temperature (such as U-C) and allowed a…

Advisors/Committee Members: Malki, Mohammed (thesis director).

Subjects/Keywords: Transition de phase; Chauffage laser; Phase transition; Laser heating

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APA (6^th Edition):

Bruycker, F. D. (2010). High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération. (Doctoral Dissertation). Université d'Orléans. Retrieved from http://www.theses.fr/2010ORLE2060

Chicago Manual of Style (16^th Edition):

Bruycker, Franck De. “High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération.” 2010. Doctoral Dissertation, Université d'Orléans. Accessed September 22, 2019. http://www.theses.fr/2010ORLE2060.

MLA Handbook (7^th Edition):

Bruycker, Franck De. “High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération.” 2010. Web. 22 Sep 2019.

Vancouver:

Bruycker FD. High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération. [Internet] [Doctoral dissertation]. Université d'Orléans; 2010. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2010ORLE2060.

Council of Science Editors:

Bruycker FD. High temperature phase transitions in nuclear fuels of the fourth generation. : Transitions de phases à hautes températures de combustibles nucléaires de quatrième génération. [Doctoral Dissertation]. Université d'Orléans; 2010. Available from: http://www.theses.fr/2010ORLE2060

University of Michigan

5. Du, Xiyu. Solid-Solid Phase Transitions in Colloidal Matter.

Degree: PhD, Physics, 2018, University of Michigan

URL: http://hdl.handle.net/2027.42/146134

► Phase transitions are ubiquitous in nature, and observed throughout everyday life from the melting of ice to the magnetization of iron. In particular, solid–solid phase… (more)

▼ Phase transitions are ubiquitous in nature, and observed throughout everyday life from the melting of ice to the magnetization of iron. In particular, solid–solid phase transitions are important in many areas such as metallurgy, geosciences, and the design of reconfigurable materials. Following the recent initiative of using nano building blocks to design next generation materials, we answer fundamental questions about solid–solid phase transitions in colloidal matter and guide the design of ma- terials that can change phase. Using the “Digital Alchemy” framework, we extend thermodynamic ensembles to include particle shape as a thermodynamic variable. This framework enables us to study the effect of altering particle shape in solid–solid phase transitions. We first study the thermodynamic order of two different solid–solid phase tran- sitions (face-centered cubic (FCC)↔body-centered cubic (BCC) and BCC↔simple cubic (SC)) in hard-particle systems upon an instantaneous change in particle shape. By calculating the Landau free energy, we are able to determine the thermody- namic order of these two phase transitions. We find FCC↔BCC is first order while BCC↔SC is second order. This work is followed up by a more detailed investigation of the FCC↔BCC transition to explore whether it can be second order. We next study the design of pressure-induced solid–solid phase transitions. Here, we incorporate varying particle shape as a part of the Monte Carlo process to find the optimal shape for a given phase transition. We successfully designed pressure driven FCC→BCC and BCC→SC transitions using three different particle shape constraints. We also study the kinetic transition pathway between solid phases. Our results show that there are similarities of the pathways of an entropic system and an atom- istic system. This demonstrates that we can use entropic systems as a toy model to understand better how the transformations happen in an atomistic system. Results from this dissertation give insight into the fundamental nature of the most common, yet poorly understood phase transitions in nature, and provide new minimal models for understanding solid–solid transitions in atomic systems. Our findings also provide guidance for the next generation of materials design. Advisors/Committee Members: Glotzer, Sharon C (committee member), van Anders, Greg (committee member), Kotov, Nicholas (committee member), Mao, Xiaoming (committee member), Ziff, Robert M (committee member).

Subjects/Keywords: phase transition, colloidal materials, solid – solid phase transition; Physics; Science

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APA (6^th Edition):

Du, X. (2018). Solid-Solid Phase Transitions in Colloidal Matter. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/146134

Chicago Manual of Style (16^th Edition):

Du, Xiyu. “Solid-Solid Phase Transitions in Colloidal Matter.” 2018. Doctoral Dissertation, University of Michigan. Accessed September 22, 2019. http://hdl.handle.net/2027.42/146134.

MLA Handbook (7^th Edition):

Du, Xiyu. “Solid-Solid Phase Transitions in Colloidal Matter.” 2018. Web. 22 Sep 2019.

Vancouver:

Du X. Solid-Solid Phase Transitions in Colloidal Matter. [Internet] [Doctoral dissertation]. University of Michigan; 2018. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/2027.42/146134.

Council of Science Editors:

Du X. Solid-Solid Phase Transitions in Colloidal Matter. [Doctoral Dissertation]. University of Michigan; 2018. Available from: http://hdl.handle.net/2027.42/146134

Iowa State University

6. Ni, Ni. Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals.

Degree: 2009, Iowa State University

URL: https://lib.dr.iastate.edu/etd/10965

► BaFe2As2 single crystal undergoes strongly coupled tetragonal to orthorhombic / paramagnetic to antiferromagnetic phase transitions at 134 K and can become superconducting under doping. To… (more)

▼ BaFe2As2 single crystal undergoes strongly coupled tetragonal to orthorhombic / paramagnetic to antiferromagnetic phase transitions at 134 K and can become superconducting under doping. To study the correlations between the structural / magnetic phase transitions and the superconductivity, seven transition metal electron doped series : Ba(Fe1-xTMx)2As2 (TM=Co, Ni, Cu, Co / Cu, Rh and Pd) were grown and characterized by microscopic, transport and thermodynamic measurements. It was found that the structural and magnetic phase transitions (upper transitions) at 134 K in pure BaFe2As2 are monotonically suppressed and increasingly separated in these doped series; in addition, superconductivity can be stabilized with a superconducting temperature rising from 0 K to a maximum and then being suppressed back to 0 K again with doping. The analysis of the temperature-doping concentration (T-x) and temperature-extra electrons (T-e) phase diagrams for all these series shows whereas the upper phase transitions are suppressed in a grossly similar manner with increasing doping concentration for all these dopants, the superconducting domes act quite differently, scaling with e: the number of extra electrons added by the doping, at least on the overdoped side of the superconducting dome. Further examination of the structural, magnetic phase transition temperatures (Ts and Tm) and the superconducting temperature,Tc, in the underdoped regime for these series reveals an essentially linear relation between Ts / Tmand Tc, which indicates a clear correlation between the suppression of structural / magnetic phase transitions and the stabilization of superconductivity. These observations lead to the understanding that the suppression of the upper (structural / magnetic ) phase transitions is a necessary but not a sufficient condition for the occurrence of low temperature superconductivity. There exists a superconducting window (a limited range of the number of extra electrons added), inside which superconductivity can be stabilized if the structural and magnetic phase transitions are suppressed enough.

Subjects/Keywords: Fe pnictide; magnetic phase transition; phase diagram; structural phase transition; superconductivity; Physics

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APA (6^th Edition):

Ni, N. (2009). Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/10965

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):

Ni, Ni. “Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals.” 2009. Thesis, Iowa State University. Accessed September 22, 2019. https://lib.dr.iastate.edu/etd/10965.

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

MLA Handbook (7^th Edition):

Ni, Ni. “Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals.” 2009. Web. 22 Sep 2019.

Vancouver:

Ni N. Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals. [Internet] [Thesis]. Iowa State University; 2009. [cited 2019 Sep 22]. Available from: https://lib.dr.iastate.edu/etd/10965.

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

Council of Science Editors:

Ni N. Structural / magnetic phase transitions and superconductivity in Ba(Fe_1-xTM_x)₂As₂ single crystals. [Thesis]. Iowa State University; 2009. Available from: https://lib.dr.iastate.edu/etd/10965

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

Université de Montréal

7. Xue, Na. The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers .

Degree: 2016, Université de Montréal

URL: http://hdl.handle.net/1866/13572

► Cette thèse concerne l’étude de phase de séparation de deux polymères thermosensibles connus-poly(N-isopropylacylamide) (PNIPAM) et poly(2-isopropyl-2-oxazoline) (PIPOZ). Parmi des études variées sur ces deux polymères,… (more)

▼ Cette thèse concerne l’étude de phase de séparation de deux polymères thermosensibles connus-poly(N-isopropylacylamide) (PNIPAM) et poly(2-isopropyl-2-oxazoline) (PIPOZ). Parmi des études variées sur ces deux polymères, il y a encore deux parties de leurs propriétés thermiques inexplicites à être étudiées. Une partie concerne l’effet de consolvant de PNIPAM dans l’eau et un autre solvant hydromiscible. L’autre est l’effet de propriétés de groupes terminaux de chaînes sur la séparation de phase de PIPOZ. Pour ce faire, nous avons d’abord étudié l’effet de l’architecture de chaînes sur l’effet de cosolvant de PNIPAMs dans le mélange de méthanol/eau en utilisant un PNIPAM en étoile avec 4 branches et un PNIPAM cyclique comme modèles. Avec PNIPAM en étoile, l’adhérence de branches PNIPAM de à un cœur hydrophobique provoque une réduction de Tc (la température du point de turbidité) et une enthalpie plus faible de la transition de phase. En revanche, la Tc de PNIPAM en étoile dépend de la masse molaire de polymère. La coopérativité de déhydratation diminue pour PNIPAM en étoile et PNIPAM cyclique à cause de la limite topologique. Une étude sur l’influence de concentration en polymère sur l’effet de cosolvant de PNIPAM dans le mélange méthanol/eau a montré qu’une séparation de phase liquide-liquide macroscopique (MLLPS) a lieu pour une solution de PNIPAM dans le mélange méthanol/eau avec la fraction molaire de méthanol entre 0.127 et 0.421 et la concentration en PNIPAM est constante à 10 g.L-1. Après deux jours d’équilibration à température ambiante, la suspension turbide de PNIPAM dans le mélange méthanol/eau se sépare en deux phases dont une phase possède beaucoup plus de PNIPAM que l’autre. Un diagramme de phase qui montre la MLLPS pour le mélange PNIPAM/eau/méthanol a été établi à base de données expérimentales. La taille et la morphologie de gouttelettes dans la phase riche en polymère condensée dépendent de la fraction molaire de méthanol. Parce que la présence de méthanol influence la tension de surface des gouttelettes liquides, un équilibre lent de la séparation de phase pour PNIPAM/eau/méthanol système a été accéléré et une séparation de phase liquide-liquide macroscopique apparait. Afin d’étudier l’effet de groupes terminaux sur les propriétés de solution de PIPOZ, deux PIPOZs téléchéliques avec groupe perfluorodécanyle (FPIPOZ) ou groupe octadécyle (C18PIPOZ) comme extrémités de chaîne ont été synthétisés. Les valeurs de Tc des polymères téléchéliques ont beaucoup diminué par rapport à celle de PIPOZ. Des micelles stables se forment dans des solutions aqueuses de polymères téléchéliques. La micellization et la séparation de phase de ces polymères dans l’eau ont été étudiées. La séparation de phase de PIPOZs téléchéliques suit le mécanisme de MLLPS. Des différences en tailles de gouttelettes formées à l’intérieur de solutions de deux polymères ont été observées. Pour étudier profondément les différences dans le comportement d’association entre deux polymères téléchéliques, les intensités des signaux de… Advisors/Committee Members: Winnik, Françoise (advisor).

Subjects/Keywords: Phase transition; Liquid-liquid phase separation; Telechelic; NMR relaxation; Transition de phase; Séparation de phase liquide-liquide; Téléchélique; Relaxation RMN

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APA (6^th Edition):

Xue, N. (2016). The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers . (Thesis). Université de Montréal. Retrieved from http://hdl.handle.net/1866/13572

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):

Xue, Na. “The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers .” 2016. Thesis, Université de Montréal. Accessed September 22, 2019. http://hdl.handle.net/1866/13572.

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

MLA Handbook (7^th Edition):

Xue, Na. “The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers .” 2016. Web. 22 Sep 2019.

Vancouver:

Xue N. The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers . [Internet] [Thesis]. Université de Montréal; 2016. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/1866/13572.

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

Council of Science Editors:

Xue N. The effects of additives and chemical modification on the solution properties of thermo-sensitive polymers . [Thesis]. Université de Montréal; 2016. Available from: http://hdl.handle.net/1866/13572

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

8. Das, Nabyendu. Some aspects of quantum phase transition in incipient ferroelectrics; -.

Degree: Physical Science, 2011, INFLIBNET

URL: http://shodhganga.inflibnet.ac.in/handle/10603/4723

None

Bibilography p.72-75

Advisors/Committee Members: Mishra, S G.

Subjects/Keywords: quantum phase transition

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APA (6^th Edition):

Das, N. (2011). Some aspects of quantum phase transition in incipient ferroelectrics; -. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/4723

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, Nabyendu. “Some aspects of quantum phase transition in incipient ferroelectrics; -.” 2011. Thesis, INFLIBNET. Accessed September 22, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/4723.

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, Nabyendu. “Some aspects of quantum phase transition in incipient ferroelectrics; -.” 2011. Web. 22 Sep 2019.

Vancouver:

Das N. Some aspects of quantum phase transition in incipient ferroelectrics; -. [Internet] [Thesis]. INFLIBNET; 2011. [cited 2019 Sep 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/4723.

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

Council of Science Editors:

Das N. Some aspects of quantum phase transition in incipient ferroelectrics; -. [Thesis]. INFLIBNET; 2011. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/4723

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

NSYSU

9. Yu, Chun-cheng. Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide.

Degree: Master, Physics, 2009, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0213109-112553

► La doped HoMn2O5 in studying the influence of the local structure distortion on the magnetic transition has been investigated systematically. It is found that by… (more)

Subjects/Keywords: GSAS; phase transition; Jana; Multiferroic; sol-gel

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APA (6^th Edition):

Yu, C. (2009). Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0213109-112553

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):

Yu, Chun-cheng. “Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide.” 2009. Thesis, NSYSU. Accessed September 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0213109-112553.

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

MLA Handbook (7^th Edition):

Yu, Chun-cheng. “Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide.” 2009. Web. 22 Sep 2019.

Vancouver:

Yu C. Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide. [Internet] [Thesis]. NSYSU; 2009. [cited 2019 Sep 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0213109-112553.

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

Council of Science Editors:

Yu C. Magnetic and crystal structure transition on La0.2Ho0.8Mn2O5 oxide. [Thesis]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0213109-112553

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

10. 吉野, 真輝; ヨシノ, マサキ. Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols.

Degree: 博士（工学）, 2000, Gunma University / 群馬大学

URL: http://hdl.handle.net/10087/8301

学位記番号:工博乙39

Subjects/Keywords: benzenediol; phase transition

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APA (6^th Edition):

吉野, 真輝; ヨシノ, �. (2000). Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols. (Thesis). Gunma University / 群馬大学. Retrieved from http://hdl.handle.net/10087/8301

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):

吉野, 真輝; ヨシノ, マサキ. “Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols.” 2000. Thesis, Gunma University / 群馬大学. Accessed September 22, 2019. http://hdl.handle.net/10087/8301.

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

MLA Handbook (7^th Edition):

吉野, 真輝; ヨシノ, マサキ. “Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols.” 2000. Web. 22 Sep 2019.

Vancouver:

吉野, 真輝; ヨシノ �. Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols. [Internet] [Thesis]. Gunma University / 群馬大学; 2000. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/10087/8301.

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

Council of Science Editors:

吉野, 真輝; ヨシノ �. Phase Transition with Volume Decrement and Its Thermodynamic Properties of Benzenediols. [Thesis]. Gunma University / 群馬大学; 2000. Available from: http://hdl.handle.net/10087/8301

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

Laurentian University

11. Dhungana, Navaraj. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment.

Degree: 2014, Laurentian University

URL: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

► The Project in Canada to Search for Supersymmetric Objects (PICASSO) searches for cold dark matter through the direct detection of Weakly Interacting Massive Particles (WIMPs)… (more)

Subjects/Keywords: dark matter; superheat; phase transition; amplitude

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APA (6^th Edition):

Dhungana, N. (2014). Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

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):

Dhungana, Navaraj. “Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. ” 2014. Thesis, Laurentian University. Accessed September 22, 2019. https://zone.biblio.laurentian.ca/dspace/handle/10219/2188.

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

MLA Handbook (7^th Edition):

Dhungana, Navaraj. “Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. ” 2014. Web. 22 Sep 2019.

Vancouver:

Dhungana N. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. [Internet] [Thesis]. Laurentian University; 2014. [cited 2019 Sep 22]. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188.

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

Council of Science Editors:

Dhungana N. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. [Thesis]. Laurentian University; 2014. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

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

Université Catholique de Louvain

12. Ponselet, Lise. Phase transitions in probabilistic cellular automata.

Degree: 2013, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/134455

►

We investigate the low-noise regime of a large class of probabilistic cellular automata, including the North-East-Center model of Toom. They are defined as stochastic perturbations… (more)

Subjects/Keywords: probabilistic cellular automata; phase transition; statistical mechanics

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APA (6^th Edition):

Ponselet, L. (2013). Phase transitions in probabilistic cellular automata. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/134455

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):

Ponselet, Lise. “Phase transitions in probabilistic cellular automata.” 2013. Thesis, Université Catholique de Louvain. Accessed September 22, 2019. http://hdl.handle.net/2078.1/134455.

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

MLA Handbook (7^th Edition):

Ponselet, Lise. “Phase transitions in probabilistic cellular automata.” 2013. Web. 22 Sep 2019.

Vancouver:

Ponselet L. Phase transitions in probabilistic cellular automata. [Internet] [Thesis]. Université Catholique de Louvain; 2013. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/2078.1/134455.

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

Council of Science Editors:

Ponselet L. Phase transitions in probabilistic cellular automata. [Thesis]. Université Catholique de Louvain; 2013. Available from: http://hdl.handle.net/2078.1/134455

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

Universitat de Valencia

13. Martínez Martínez, Daniel. Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota.

Degree: 2019, Universitat de Valencia

URL: http://hdl.handle.net/10550/68844

► Animal microbiota plays an essential role in keeping the physiological status of the host healthy. This microbiota consists of hundreds of different species that inhabit… (more)

▼ Animal microbiota plays an essential role in keeping the physiological status of the host healthy. This microbiota consists of hundreds of different species that inhabit the host, and whose composition varies on a daily basis due to multiple factors as diets, medicine intakes, lifestyle or diseases. It is a highly dynamical system that shows variability even when the host is in a healthy condition, but visible changes happen when the system is perturbed. Thus, the main objective of this thesis aimed to study the temporal variability of human microbiota, and link it to the health status of the host. For this, we proposed a formal definition of stability in microbial systems based on the use of the Taylor#s law, an empirical law that captures the degree of variability of a community through time or space. With this tool in hand, we studied different scenarios in which the microbiome was perturbed. This law estimates the temporal variability of the microbial population and quantitatively characterises the path toward disease via a noise-induced phase transition. As the estimation of these systemic parameters may be of clinical utility, we applied this methodology to two cases of follow-up studies. The first one was related to the study of children suffering from acute infectious diarrhoea, one of the leading causes of mortality in children worldwide. This study aimed to correlate the dynamics of gut microbiota with the evolution of children who were suffering from acute infectious diarrhoea caused by a rotavirus. The experiment involved 10 children with acute infectious diarrhoea caused by a rotavirus and six healthy children. We observed that both alpha and beta diversities recovered with time in unhealthy children, something further supported by the analysis of their dynamics. The second case consisted of the study of the oral microbiomes from 26 volunteers during one month. We aimed to measure the correlations that could exist between microbial variability and the daily variability of five oxidative stress markers. We observed that all volunteers presented a different degree of variability, but constrained within a stable region. Furthermore, we also found that there was not a universal pattern of correlations between markers, or between OTUs and markers, pointing to a polymicrobial theory of disease. Finally, it is known that the behaviour of a microbial ecosystem is determined by the interactions among the participating species. We present a novel methodology where the experimental design must include alterations of the microbial ecosystem to uncover specific interactions. We demonstrate that microbial interactions can be inferred from noise-induced experiments in which the variability of a given species is modified. We illustrate our findings with two examples where a four-fold increase in the variability of a given taxon uncovers some of its interactions with other taxa in the ecosystem. Advisors/Committee Members: Moya Simarro, Andrés (advisor).

Subjects/Keywords: microbiota; dynamics; human health; phase transition; 16S

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

APA (6^th Edition):

Martínez Martínez, D. (2019). Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota. (Doctoral Dissertation). Universitat de Valencia. Retrieved from http://hdl.handle.net/10550/68844

Chicago Manual of Style (16^th Edition):

Martínez Martínez, Daniel. “Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota. ” 2019. Doctoral Dissertation, Universitat de Valencia. Accessed September 22, 2019. http://hdl.handle.net/10550/68844.

MLA Handbook (7^th Edition):

Martínez Martínez, Daniel. “Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota. ” 2019. Web. 22 Sep 2019.

Vancouver:

Martínez Martínez D. Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota. [Internet] [Doctoral dissertation]. Universitat de Valencia; 2019. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/10550/68844.

Council of Science Editors:

Martínez Martínez D. Stability of the human microbiome. Health and disease imprinted in the time variability of the human microbiota. [Doctoral Dissertation]. Universitat de Valencia; 2019. Available from: http://hdl.handle.net/10550/68844

Vanderbilt University

14. Wan, Li. Understanding the Nanoconfined Fluid via Absolute Free Energy Determination.

Degree: PhD, Chemical Engineering, 2015, Vanderbilt University

URL: http://etd.library.vanderbilt.edu//available/etd-03192015-143339/ ;

► In recent years, the development of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS) has received intense attention and effort. However, studies on nanoconfined fluid phase… (more)

▼ In recent years, the development of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS) has received intense attention and effort. However, studies on nanoconfined fluid phase behavior has given rise to a vigorous debate that began in the early 1990s. While experiments by Klein and coworkers suggest the formation of a nanoconfinement-induced solid phase as the separation of two solid walls is reduced below seven molecular layers, experiments by Granick and coworkers instead suggest that a glassy state is formed, since no yield stress was observed in their experiment and the measured viscosity increase is significantly smaller. Simulation studies have intrinsic molecular resolution and hence no such observational problems, but the lack of a clear demonstration that the observed solid-like structure is an equilibrated structure, has hindered wide acceptance of the results of these studies. To determine whether a structure is metastable, the key measurement required is the free energy of the system. We concentrate our studies on development and applications of absolute free energy calculation methodology, specifically for nanoconfined systems, and uses the absolute free energy to reach a conclusive understanding of nanoconfined fluid phase behavior. Based on free energy measurements conducted in this dissertation research, we reveal the thermodynamic role of wall-fluid interaction, wall-wall separation and fluid-wall particle size ratio, in determining nanoconfined phase behavior. Finally, according to investigations on the central layers of nanoconfined system with artificially increased density, we demonstrate the potential of jammed atoms in destabilizing the nanoconfinement-induced solid structure. This finding suggests one possible explanation of the divergent experimental results. In this picture, we find there are discrete solid states at separations around integer numbers of ideal layers, as opposed to a conventional fluid-solid transition. Advisors/Committee Members: Peter T. Cummings (chair), Clare M. McCabe (committee member), M. Douglas LeVan (committee member), Terry P. Lybrand (committee member).

Subjects/Keywords: Nanoconfined Fluid; Phase Transition; Free Energy

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APA (6^th Edition):

Wan, L. (2015). Understanding the Nanoconfined Fluid via Absolute Free Energy Determination. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://etd.library.vanderbilt.edu//available/etd-03192015-143339/ ;

Chicago Manual of Style (16^th Edition):

Wan, Li. “Understanding the Nanoconfined Fluid via Absolute Free Energy Determination.” 2015. Doctoral Dissertation, Vanderbilt University. Accessed September 22, 2019. http://etd.library.vanderbilt.edu//available/etd-03192015-143339/ ;.

MLA Handbook (7^th Edition):

Wan, Li. “Understanding the Nanoconfined Fluid via Absolute Free Energy Determination.” 2015. Web. 22 Sep 2019.

Vancouver:

Wan L. Understanding the Nanoconfined Fluid via Absolute Free Energy Determination. [Internet] [Doctoral dissertation]. Vanderbilt University; 2015. [cited 2019 Sep 22]. Available from: http://etd.library.vanderbilt.edu//available/etd-03192015-143339/ ;.

Council of Science Editors:

Wan L. Understanding the Nanoconfined Fluid via Absolute Free Energy Determination. [Doctoral Dissertation]. Vanderbilt University; 2015. Available from: http://etd.library.vanderbilt.edu//available/etd-03192015-143339/ ;

Rice University

15. Ji, Heng. Hydrogen doping and the metal-insulator phase transition in vanadium dioxide.

Degree: PhD, Natural Sciences, 2015, Rice University

URL: http://hdl.handle.net/1911/88259

► Strongly correlated systems represent a major topic of study in condensed matter physics. Vanadium dioxide, a strongly correlated material, has a sharp metal-to-insulator phase transition… (more)

▼ Strongly correlated systems represent a major topic of study in condensed matter physics. Vanadium dioxide, a strongly correlated material, has a sharp metal-to-insulator phase transition at around 340 K (67 °C), a moderate temperature which can be easily achieved. Its potential as a functional material in optical switches and semiconductor applications has attracted a great deal of attention in recent years. In this thesis, after a detailed introduction of this material and the methods we used to grow VO2 in our lab (Chapter 1), I will discuss our attempts to modulate the electronic properties and phase transition of single-crystal VO2 samples. It started with a plan to use ionic liquid to apply an electrostatic gate to this material. Although modulation of the resistance was observed, we also discovered an unexpected electrochemical reaction, leading to a suspicion that hydrogen doping is the reason for the change of properties of VO2 (Chapter 2). Next, a series of experiments were performed to systematically study the mechanism of this hydrogen doping process and to characterize the hydrogenated VO2. Our collaborators also provided supporting simulation results to interpret these phenomena from a theoretical point of view, as well as results from synchrotron x-ray diffraction and neutron diffraction experiments. From all these studies, we confirmed the existence of the hydrogen intercalation in VO2 (Chapter 3), and further, plotted the phase diagram as a function of temperature and hydrogen concentration (Chapter 5). We also found that this diffusion process prefers the rutile crystal structure of VO2 (i.e. metallic phase) and specifically, its c-axis (Chapter 4). Finally, the low-temperature electric transport properties of the hydrogenated VO2 material have been studied for the first time, and interesting magneto-resistance responses will be discussed (chapter 6). Advisors/Committee Members: Natelson, Douglas (advisor), Du, Rui-rui (committee member), Biswal, Sibani L (committee member).

Subjects/Keywords: VO2; Vanadium dioxide; hydrogenation; phase transition

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APA (6^th Edition):

Ji, H. (2015). Hydrogen doping and the metal-insulator phase transition in vanadium dioxide. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/88259

Chicago Manual of Style (16^th Edition):

Ji, Heng. “Hydrogen doping and the metal-insulator phase transition in vanadium dioxide.” 2015. Doctoral Dissertation, Rice University. Accessed September 22, 2019. http://hdl.handle.net/1911/88259.

MLA Handbook (7^th Edition):

Ji, Heng. “Hydrogen doping and the metal-insulator phase transition in vanadium dioxide.” 2015. Web. 22 Sep 2019.

Vancouver:

Ji H. Hydrogen doping and the metal-insulator phase transition in vanadium dioxide. [Internet] [Doctoral dissertation]. Rice University; 2015. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/1911/88259.

Council of Science Editors:

Ji H. Hydrogen doping and the metal-insulator phase transition in vanadium dioxide. [Doctoral Dissertation]. Rice University; 2015. Available from: http://hdl.handle.net/1911/88259

University of North Texas

16. Zare, Marzieh. Cooperation-induced Criticality in Neural Networks.

Degree: 2013, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc283813/

► The human brain is considered to be the most complex and powerful information-processing device in the known universe. The fundamental concepts behind the physics of… (more)

Subjects/Keywords: Cooperation; criticality; temporal complexity; phase transition

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APA (6^th Edition):

Zare, M. (2013). Cooperation-induced Criticality in Neural Networks. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc283813/

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):

Zare, Marzieh. “Cooperation-induced Criticality in Neural Networks.” 2013. Thesis, University of North Texas. Accessed September 22, 2019. https://digital.library.unt.edu/ark:/67531/metadc283813/.

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

MLA Handbook (7^th Edition):

Zare, Marzieh. “Cooperation-induced Criticality in Neural Networks.” 2013. Web. 22 Sep 2019.

Vancouver:

Zare M. Cooperation-induced Criticality in Neural Networks. [Internet] [Thesis]. University of North Texas; 2013. [cited 2019 Sep 22]. Available from: https://digital.library.unt.edu/ark:/67531/metadc283813/.

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

Council of Science Editors:

Zare M. Cooperation-induced Criticality in Neural Networks. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc283813/

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

Laurentian University

17. Dhungana, Navaraj. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment.

Degree: 2014, Laurentian University

URL: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

► The Project in Canada to Search for Supersymmetric Objects (PICASSO) searches for cold dark matter through the direct detection of Weakly Interacting Massive Particles (WIMPs)… (more)

Subjects/Keywords: dark matter; superheat; phase transition; amplitude

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APA (6^th Edition):

Dhungana, N. (2014). Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

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):

Dhungana, Navaraj. “Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. ” 2014. Thesis, Laurentian University. Accessed September 22, 2019. https://zone.biblio.laurentian.ca/dspace/handle/10219/2188.

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

MLA Handbook (7^th Edition):

Dhungana, Navaraj. “Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. ” 2014. Web. 22 Sep 2019.

Vancouver:

Dhungana N. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. [Internet] [Thesis]. Laurentian University; 2014. [cited 2019 Sep 22]. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188.

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

Council of Science Editors:

Dhungana N. Background discrimination studies and measurements of droplet and bubble size for the Picasso experiment. [Thesis]. Laurentian University; 2014. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2188

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

University of Sydney

18. Allen, Patryck Kevyn Kidd. Structural studies of lead-free piezoelectrics with the fresnoite structure type .

Degree: 2012, University of Sydney

URL: http://hdl.handle.net/2123/11986

► The lead free piezoelectric fresnoite A2M3O8 (A = Ba, Sr, K, Cs; M = Ti, V, Si, Ge) modulated structure type has been investigated owing… (more)

▼ The lead free piezoelectric fresnoite A2M3O8 (A = Ba, Sr, K, Cs; M = Ti, V, Si, Ge) modulated structure type has been investigated owing to its potential to exhibit excellent piezoelectric response coefficients. Ba2TiSi2O8, Sr2TiSi2O8, and Ba2TiGe2O8 end members in addition to members of the Ba2xSr2-2xTiSi2O8, Ba2xSr2 2xTiGe2O8, Ba2TiGe2ySi2 2yO8, and BaSrTiGe2ySi2 2yO8 series were synthesised and characterised using a combination of variable temperature diffraction techniques. The Ba2TiSi2O8 and Sr2TiSi2O8 modulated structures at ambient temperature were characterised using neutron powder diffraction for the first time. Variable temperature synchrotron X ray diffraction data showed a new means of identifying the incommensurate to prototypic structural phase transition at 433 K. Resonant ultrasound spectroscopy has shown coupling between the elastic moduli and structural changes in fresnoite samples. Polycrystalline Sr2TiSi2O8 samples were shown to undergo a first order phase transition from a two phase mixture of incommensurately modulated tetragonal and orthorhombic phases to a single incommensurately modulated orthorhombic phase that is complete by 567 K. The proportion of the orthorhombic phase Sr2TiSi2O8 samples was shown to slowly decrease on cooling to 125 K. The Sr2TiSi2O8 structure was also shown to undergo an additional phase transition from the incommensurately modulated orthorhombic phase to a tetragonal phase at 1323 K for the first time. The inclusion of barium or germanium into the Sr2TiSi2O8 structure was shown to suppress the formation of the orthorhombic phase at ambient temperature and elevated temperatures. New phase diagrams for the Ba2xSr2-2xTiSi2O8 and Sr2TiGe2ySi2 2yO8 systems summarise the phase transitions investigated. The intrinsic piezoelectric coefficients were calculated to be approximately 5 pm V 1 and 27 pm V 1 for polycrystalline samples of Ba2TiSi2O8 and Sr2TiSi2O8 respectively and compared to common piezoelectric materials.

Subjects/Keywords: Fresnoite; Modulated structure; Phase transition; Incommensurate; Piezoelectric

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APA (6^th Edition):

Allen, P. K. K. (2012). Structural studies of lead-free piezoelectrics with the fresnoite structure type . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/11986

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):

Allen, Patryck Kevyn Kidd. “Structural studies of lead-free piezoelectrics with the fresnoite structure type .” 2012. Thesis, University of Sydney. Accessed September 22, 2019. http://hdl.handle.net/2123/11986.

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

MLA Handbook (7^th Edition):

Allen, Patryck Kevyn Kidd. “Structural studies of lead-free piezoelectrics with the fresnoite structure type .” 2012. Web. 22 Sep 2019.

Vancouver:

Allen PKK. Structural studies of lead-free piezoelectrics with the fresnoite structure type . [Internet] [Thesis]. University of Sydney; 2012. [cited 2019 Sep 22]. Available from: http://hdl.handle.net/2123/11986.

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

Council of Science Editors:

Allen PKK. Structural studies of lead-free piezoelectrics with the fresnoite structure type . [Thesis]. University of Sydney; 2012. Available from: http://hdl.handle.net/2123/11986

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

University of Bath

19. Thompson, Ian. Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions.

Degree: PhD, 2015, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/dynamic-phase-transitions-in-biased-ensembles-of-particle-systems-with-repulsive-interactions(eec4f877-ac19-4cee-8323-87defc8c98ab).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407

► We study dynamic phase transitions in the constant-volume and constant- pressure ensembles of two different systems: a one-dimensional system of diffusive hard particles and a… (more)

Subjects/Keywords: 539.7; Dynamic phase transitions; Glass transition

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APA (6^th Edition):

Thompson, I. (2015). Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/dynamic-phase-transitions-in-biased-ensembles-of-particle-systems-with-repulsive-interactions(eec4f877-ac19-4cee-8323-87defc8c98ab).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407

Chicago Manual of Style (16^th Edition):

Thompson, Ian. “Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions.” 2015. Doctoral Dissertation, University of Bath. Accessed September 22, 2019. https://researchportal.bath.ac.uk/en/studentthesis/dynamic-phase-transitions-in-biased-ensembles-of-particle-systems-with-repulsive-interactions(eec4f877-ac19-4cee-8323-87defc8c98ab).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407.

MLA Handbook (7^th Edition):

Thompson, Ian. “Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions.” 2015. Web. 22 Sep 2019.

Vancouver:

Thompson I. Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions. [Internet] [Doctoral dissertation]. University of Bath; 2015. [cited 2019 Sep 22]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/dynamic-phase-transitions-in-biased-ensembles-of-particle-systems-with-repulsive-interactions(eec4f877-ac19-4cee-8323-87defc8c98ab).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407.

Council of Science Editors:

Thompson I. Dynamic phase transitions in biased ensembles of particle systems with repulsive interactions. [Doctoral Dissertation]. University of Bath; 2015. Available from: https://researchportal.bath.ac.uk/en/studentthesis/dynamic-phase-transitions-in-biased-ensembles-of-particle-systems-with-repulsive-interactions(eec4f877-ac19-4cee-8323-87defc8c98ab).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665407

20. Fossati, Paul. Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide.

Degree: Docteur es, Physique, 2012, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2012ECAP0045

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Les propriétés mécaniques du combustibles nucléaire sont un problème complexe qui fait intervenir de nombreux mécanismes différents à des échelles diverses. Afin de faire progresser… (more)

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Les propriétés mécaniques du combustibles nucléaire sont un problème complexe qui fait intervenir de nombreux mécanismes différents à des échelles diverses. Afin de faire progresser notre connaissance de ce matériau, nous avons effectué des simulations utilisant des modèles de Dynamique Moléculaire. Ces simulations permettent l'étude de différents mécanismes de déformation du dioxyde d'uranium à l'échelle atomique. Nous avons mis en place une procédure permettant de calculer les chemins de transition entre différents polymorphes de l'UO2 de manière statique et dynamique. Ces calculs ont confirmé la stabilité des structures fluorine à pression ambiante et cotunnite en compression, vers laquelle une transition reconstructive a été observée. Ils ont aussi montré l'importance de la direction de sollicitation principale pour déterminer la transition activée en tension, soit vers une structure scrutinyite, soit vers une structure rutile. D'autre part, les propriétés élastiques de l'UO2 ont été déterminées en température à partir d'une approche multi-modèles. L'accord relatif entre les potentiels existants pour l'UO2 a été utilisé pour déterminer des paramètres pour des modèles mésoscopiques. La propagation d’une fissure dans un monocristal a ensuite été étudié. Lors de ces simulations nous avons mis en évidence l'apparition de phases secondaires en pointe de fissure. Ce mécanisme prédit par les modèles atomistiques pourrait jouer un rôle important lors de la propagation d’une fissure aux échelles supérieures. Finalement, certaines propriétés des dislocations coin stabilisées dans le cristal UO2 ont été étudiées. La structure de cœur de ces dislocations dans différents plans de glissements a été comparée. Leur contrainte critique de glissement en fonction de la température a été calculée. Ces derniers calculs suggèrent un lien direct entre le désordre chimique observé au cœur de dislocations et leur mobilité.

Mechanical properties of nuclear fuel are a complex problem, involving many coupled mechanisms occurring at different length scales. We used Molecular Dynamics models to bring some light on some of these mechanisms at the atomic scale. We devised a procedure to calculate transition pathways between some UO2 polymorphs, and then carried out dynamics simulations of these transitions. We confirmed the stability of the cotunnite structure at high pressure using various empirical potentials, the fluorite structure being the most stable at room pressure. Moreover, we showed a reconstructive phase transition between the fluorite and cotunnite structures. We also showed the importance of the major deformation axis on the kind of transition that occur under tensile conditions. Depending on the loading direction, a scrutinyite or rutile phase can appear. We then calculated the elastic behaviour of UO2 using different potentials. The relative agreement between them was used to produce a set of parameters to be used as input in mesoscale models. We also simulated crack propagation in UO2 single crystals. These simulations…

Advisors/Committee Members: Devincre, Benoît (thesis director).

Subjects/Keywords: Dynamique moléculaire; Transition de phase; Combustible nucléaire; Molecular dynamics; Phase transition; Nuclear fuel

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):

Fossati, P. (2012). Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2012ECAP0045

Chicago Manual of Style (16^th Edition):

Fossati, Paul. “Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide.” 2012. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed September 22, 2019. http://www.theses.fr/2012ECAP0045.

MLA Handbook (7^th Edition):

Fossati, Paul. “Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide.” 2012. Web. 22 Sep 2019.

Vancouver:

Fossati P. Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2012. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2012ECAP0045.

Council of Science Editors:

Fossati P. Contribution à l'étude des propriétés mécaniques du combustible nucléaire : Modélisation atomistique de la déformation du dioxyde d'uranium : Contribution to the study of mechanical properties of nuclear fuel : atomistic modelling of the deformation of uranium dioxide. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2012. Available from: http://www.theses.fr/2012ECAP0045

21. Lavrskyi, Mykola. Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures.

Degree: Docteur es, Physique, 2017, Normandie

URL: http://www.theses.fr/2017NORMR003

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Cette thèse a été centrée sur l’étude de la formation d’une phase martensitique dans les aciersFe-Ni-C et sur la diffusion des atomes de carbone dans… (more)

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Cette thèse a été centrée sur l’étude de la formation d’une phase martensitique dans les aciersFe-Ni-C et sur la diffusion des atomes de carbone dans cette phase à basse température. Lamodélisation à l’échelle atomique a été utilisée. Pour décrire ces phénomènes, deux approchesont été développées: un modèle discret basé sur la théorie de la fonction de densité atomique(ADF) et une approche quasiparticulaire basée sur la théorie atomique de Fratons (AFT). Dansun premier temps, pour montrer l’universalité de notre approche, nous avons appliqué l'AFTpour modéliser la cinétique d'auto-assemblage des atomes initialement désordonnés à desstructures ordonnées complexes. Cette approche a ensuite été appliquée à l'étude detransformation austénite/martensite. Il a été montré que le germe de martensite se développecomme agrégat multivariant dans la matrice austénitique. En utilisant des figures de pôles etdes diagrammes de diffraction simulés, ces variants ont été identifiés et comparés aux donnéesexpérimentales. La diffusion du carbone dans la phase de martensite a été étudiée en utilisantla théorie ADF. Deux systèmes avec différentes propriétés élastiques, Fe-C et Fe-Ni-C, ont étéconsidérés. Il a été montré qu’au cours du premier stade de vieillissement, les atomes decarbone subissent une décomposition spinodale sur les interstices octaédriques du réseautétragonal centré de martensite et forment les zones riches en carbone. Ensuite, la morphologie«tweed-like» des zones riches en carbone est développée. Les résultats des simulations sontun bon accord avec les images expérimentales obtenues par sonde atomique tomographique.La relation entre une mise en ordre de Zener et la concentration des zones riches en carbone aété discutée.

This thesis examines the formation of martensite in Fe-Ni-C steels and the diffusion of carbonatoms in this phase at low temperatures. To achieve this goal the atomistic modeling have beenused. To describe these phenomena two different approaches were developed: a discretemodel based on the Atomic Density Function (ADF) theory and the quasiparticle approachesbased on the Atomic Fraton Theory (AFT). First, the AFT was tested to model a self-assemblykinetics of initially disordered systems to three different classes of ordered one: singlecomponent crystals with fcc and diamond structures, two component crystals with zinc-blendstructure, and polymers with single-strand and double-stranded helixes structures. Then thisapproach was applied to model austenite/martensite transformation. It was shown thatmartensite nucleus grows as multivariant aggregate in austenite matrix. Using pole figures andsimulated diffraction patterns these variants were identified and compared with the experimentaldata. The carbon diffusion in martensite phase was studied using ADF theory. Two systemswith the different elastic properties corresponding to the Fe-C and Fe-Ni-C systems wereconsidered. It was shown that during a first stage of aging the carbon atoms undergo a spinodaldecomposition on the octahedral interstices of bcc…

Advisors/Committee Members: Zapolsky, Héléna (thesis director).

Subjects/Keywords: Dir. physique; Transition de phase; Transformation martensitique; Phase transition; Martensitic transformation; Solidification

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

APA (6^th Edition):

Lavrskyi, M. (2017). Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2017NORMR003

Chicago Manual of Style (16^th Edition):

Lavrskyi, Mykola. “Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures.” 2017. Doctoral Dissertation, Normandie. Accessed September 22, 2019. http://www.theses.fr/2017NORMR003.

MLA Handbook (7^th Edition):

Lavrskyi, Mykola. “Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures.” 2017. Web. 22 Sep 2019.

Vancouver:

Lavrskyi M. Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures. [Internet] [Doctoral dissertation]. Normandie; 2017. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2017NORMR003.

Council of Science Editors:

Lavrskyi M. Modélisation en fonctionnelle de la densité atomique des transformations de phases dans le système Fe-C à basse température : Functional Modification of the Atomic Density of Phase Transitions in the Fe-C System at Low Temperatures. [Doctoral Dissertation]. Normandie; 2017. Available from: http://www.theses.fr/2017NORMR003

Cleveland State University

22. WAN, JIA, HONG. Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions.

Degree: MSin Biomedical Engineering, Washkewicz College of Engineering, 2016, Cleveland State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=csu1471923273

► Elastin-like polypeptides (ELPs) are environmentally responsive biopolymers that respond to various forms of external stimuli such as temperature, light, and pH. Several factors can influence… (more)

Subjects/Keywords: Biomedical Engineering; Polymers; Elastin-like polypeptides; transition temperature; phase transition behavior; phase diagram

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

APA (6^th Edition):

WAN, JIA, H. (2016). Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions. (Masters Thesis). Cleveland State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=csu1471923273

Chicago Manual of Style (16^th Edition):

WAN, JIA, HONG. “Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions.” 2016. Masters Thesis, Cleveland State University. Accessed September 22, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1471923273.

MLA Handbook (7^th Edition):

WAN, JIA, HONG. “Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions.” 2016. Web. 22 Sep 2019.

Vancouver:

WAN, JIA H. Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions. [Internet] [Masters thesis]. Cleveland State University; 2016. [cited 2019 Sep 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=csu1471923273.

Council of Science Editors:

WAN, JIA H. Investigation into the phase separation behavior of concentrated elastin-like polypeptide solutions. [Masters Thesis]. Cleveland State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=csu1471923273

23. Mitra, Sunanda. Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques.

Degree: Docteur es, Chimie, 2016, Paris Saclay

URL: http://www.theses.fr/2016SACLS562

►

Ce travail de thèse porte sur une série d’échantillons de composition nominale AgBiSe2-xSx (avec x= 0 à 2), appartenant à la famille des chalcogénures ternaires… (more)

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Ce travail de thèse porte sur une série d’échantillons de composition nominale AgBiSe2-xSx (avec x= 0 à 2), appartenant à la famille des chalcogénures ternaires de type I-V-VI₂. Les analyses structurales et thermiques ont mis en évidence une solution solide complète sans gap de miscibilité, et des transitions de phase pour toutes les compositions. Nous avons pu obtenir des composés monophasés à la fois des phases hexagonale et cubique, et notre étude de DRX en température à mis en évidence une phase rhomboédrique pour certaines compositions (x=1 à 2 dans AgBiSexS2-x). Les résultats de DSC ont confirmé la présence de transitions de phase pour toutes les compositions, avec un déplacement des températures de transition en fonction de la fraction de soufre/sélénium. Notre étude de DRX sous pression de l’échantillon AgBiSe₂ a montré une transition de phase induite par la pression d’une phase hexagonale à rhomboédrique puis cubique. Suite à cette observation, l’application d’une pression chimique, par la substitution de 30% du Bi par du Sb a été utilisée avec succès pour stabiliser la phase cubique pour toutes les compositions. Le dopage par Nb des échantillons substitués par l’antimoine l’a pas eu d’influence sur la nature des phases stables à l’ambiante en comparaison aux échantillons non dopés. Nous avons ensuite étudié l’influence du dopage sur les propriétés de transport. Les valeurs négatives de S pour toutes les compositions indiquent un comportement de semi-conducteur de type n dans la gamme (50-300K). Par ailleurs, nos mesures ont montré à a fois de très faibles valeurs de κ mais aussi une décroissance de ∣S∣ et ρ avec l’augmentation de la fraction de Nb. Ces résultats devraient permettre d’optimiser le facteur de puissance pour améliorer les valeurs de ZT. Enfin, une étude en collaboration avec une équipe chinoise a permis d’obtenir une valeur de ZT de 1.3 à 890K dans un composé AgPbmSnSe₂.

Here, we report on a series of samples with nominal compositions AgBiSe2-xSx (with x= 0 to 2) belonging to the class of ternary chalcogenides of type I-V-VI₂. The structural and thermal analysis result shows a complete solid solution without miscibility gap and phase transitions for all compositions. We have succeeded in obtaining single phase compounds, of both hexagonal and cubic phase, and the high temperature XRD study showed the rhombohedral phase too for selected compositions (x=1 to 2 in AgBiSexS2-x). The DSC results confirmed the presence of the phase transitions for all compositions, with a shift of the temperature of transition as a function of the sulfur/selenium fraction. The high pressure XRD investigation of the compound AgBiSe₂ showed a pressure induced phase transition from hexagonal-to-rhombohedral-to-cubic phase. In this respect, chemical pressure with 30% Sb on the Bi site has been successfully applied to stabilize the cubic phase for all compositions. Nb doping in the Sb-substituted samples does not show any change in the phase behavior at RT in comparison with the undoped samples. The influence of…

Advisors/Committee Members: Bérardan, David (thesis director).

Subjects/Keywords: Thermoélectricité; Matériaux chalcogénures; Transition de phase; Pression chimique; Thermoelectric; Chalcogenide materials; Phase transition; Chemical pressure

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

APA (6^th Edition):

Mitra, S. (2016). Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2016SACLS562

Chicago Manual of Style (16^th Edition):

Mitra, Sunanda. “Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques.” 2016. Doctoral Dissertation, Paris Saclay. Accessed September 22, 2019. http://www.theses.fr/2016SACLS562.

MLA Handbook (7^th Edition):

Mitra, Sunanda. “Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques.” 2016. Web. 22 Sep 2019.

Vancouver:

Mitra S. Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques. [Internet] [Doctoral dissertation]. Paris Saclay; 2016. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2016SACLS562.

Council of Science Editors:

Mitra S. Chalcogenide of type I-V-VI₂ for thermoelectric applications : Chalcogénures de type I-V-VI₂ pour applications thermoélectriques. [Doctoral Dissertation]. Paris Saclay; 2016. Available from: http://www.theses.fr/2016SACLS562

24. Varshney, Pooja. Phase transition studies in Zro2 doped with transition metal oxides; -.

Degree: Chemistry, 2006, Aligarh Muslim University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/53738

Abstract available newline newline

-

Advisors/Committee Members: Beg, Saba.

Subjects/Keywords: Phase; Transition; Studies; Doped; Transition

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

APA (6^th Edition):

Varshney, P. (2006). Phase transition studies in Zro2 doped with transition metal oxides; -. (Thesis). Aligarh Muslim University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/53738

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):

Varshney, Pooja. “Phase transition studies in Zro2 doped with transition metal oxides; -.” 2006. Thesis, Aligarh Muslim University. Accessed September 22, 2019. http://shodhganga.inflibnet.ac.in/handle/10603/53738.

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

MLA Handbook (7^th Edition):

Varshney, Pooja. “Phase transition studies in Zro2 doped with transition metal oxides; -.” 2006. Web. 22 Sep 2019.

Vancouver:

Varshney P. Phase transition studies in Zro2 doped with transition metal oxides; -. [Internet] [Thesis]. Aligarh Muslim University; 2006. [cited 2019 Sep 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/53738.

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

Council of Science Editors:

Varshney P. Phase transition studies in Zro2 doped with transition metal oxides; -. [Thesis]. Aligarh Muslim University; 2006. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/53738

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

NSYSU

25. Wu, Hung-Cheng. Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study.

Degree: Master, Physics, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803113-102053

► Transitional metal oxide nanoparticles (doping 0.5 mole %) embedded in a silica glass using the sol-gel method with different annealing temperatures. For iron-oxide nanoparticles system.… (more)

Subjects/Keywords: diffuse phase transition; magnetodielectric; dielectric; ferroelectric transition; transitional metal oxide nanoparticles

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

APA (6^th Edition):

Wu, H. (2013). Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803113-102053

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):

Wu, Hung-Cheng. “Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study.” 2013. Thesis, NSYSU. Accessed September 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803113-102053.

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

MLA Handbook (7^th Edition):

Wu, Hung-Cheng. “Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study.” 2013. Web. 22 Sep 2019.

Vancouver:

Wu H. Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study. [Internet] [Thesis]. NSYSU; 2013. [cited 2019 Sep 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803113-102053.

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

Council of Science Editors:

Wu H. Transitional metal oxide nanoparticle embedded in SiO2 glass matrix: magnetic and dielectric study. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0803113-102053

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

University of Minnesota

26. Lin, Yen-Hsiang. Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition.

Degree: PhD, Physics, 2011, University of Minnesota

URL: http://purl.umn.edu/115916

► A combination of thickness- and perpendicular magnetic field-tuning of SI transitions has been performed on quench-deposited homogeneous a-Bi thin films with a 14.67 Angstrom a-Sb… (more)

▼ A combination of thickness- and perpendicular magnetic field-tuning of SI transitions has been performed on quench-deposited homogeneous a-Bi thin films with a 14.67 Angstrom a-Sb underlayer. Transport properties, including measurements of resistance and of I-V characteristics have been studied in both the insulating and superconducting regimes. In the insulating regime, the resistance exhibits an Arrhenius type of conduction and the magnetoresistance (MR) exhibits a peak in perpendicular magnetic field. Furthermore, a possible quantum phase transition is found in the insulating regime. Presumably this transition is between the Bose and Fermi insulators discussed in the literature. The I-V characteristics exhibit strong non-linearities in the insulating regime at low temperatures. These non-linear curves can be well described by a heating model involving the decoupling of the electronic and phononic degrees of freedom at low temperatures. On the conductive or superconducting side of the transition, the transport properties are found to be remarkably similar to those of an overdamped random Josephson junction array, and vortex dynamics dominates the conductive behavior in both zero and non-zero magnetic fields. These observations suggest that isolated superconducting islands or localized Cooper pairs exist in both the insulating and conductive regimes. An AFM scan of the last film in the sequence has revealed that this series of films although continuous, has thickness variations on a mesoscopic length scale. Therefore, it is not surprising that there may be superconducting islands. The AFM scan also suggests that some of the thick, nominal granular films grown by quench condensed deposition are directly connected with large thickness variations. These insulating granular films also exhibit an Arrhenius type conduction at low temperatures, which reveals the existence of a hard gap in the electronic density of states, which is consistent with the theory of Feigel'man et al.. However, the activation energy of the Arrhenius type conduction found in the thickness tuning homogeneous a-Bi films doesn't follow this model. Therefore, the model may not completely explain the hard gap.

Subjects/Keywords: Disorder superconductor; Quantum phase transition; Superconuctor-Insulator transition; Physics

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

APA (6^th Edition):

Lin, Y. (2011). Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/115916

Chicago Manual of Style (16^th Edition):

Lin, Yen-Hsiang. “Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition.” 2011. Doctoral Dissertation, University of Minnesota. Accessed September 22, 2019. http://purl.umn.edu/115916.

MLA Handbook (7^th Edition):

Lin, Yen-Hsiang. “Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition.” 2011. Web. 22 Sep 2019.

Vancouver:

Lin Y. Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition. [Internet] [Doctoral dissertation]. University of Minnesota; 2011. [cited 2019 Sep 22]. Available from: http://purl.umn.edu/115916.

Council of Science Editors:

Lin Y. Electrical transport properties of ultrathin amorphous bismuth films near the superconductor-insulator transition. [Doctoral Dissertation]. University of Minnesota; 2011. Available from: http://purl.umn.edu/115916

Princeton University

27. Li, Qianxiao. Phase Transition and Free Action of Non-equilibrium Systems .

Degree: PhD, 2016, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01dv13zw63x

► Extending the concept of free energy to non-equilibrium systems is a central problem in non-equilibrium statistical mechanics. In this dissertation, we discuss the issue for… (more)

▼ Extending the concept of free energy to non-equilibrium systems is a central problem in non-equilibrium statistical mechanics. In this dissertation, we discuss the issue for two classes of non-equilibrium systems. In the first part, we focus on systems endowed with a stochastic dynamics that produces non-equilibrium steady states.We first show that a naive generalization of the free energy, based on replacing the canonical ensemble by the non-equilibrium steady state distribution, does not capture dynamical information at steady state. To resolve this, we introduce a new concept, which we term the "free action". This can be viewed as free energy on path-space and it naturally captures macroscopic transition rates in the thermodynamic limit. Moreover, the path-space formulation allows us to develop an efficient numerical algorithm, based on Hamiltonian Monte-Carlo and thermodynamic integration, to calculate the free action. We illustrate our framework with two examples. The first is a minimal model of a chemical reaction network exhibiting a first order phase transition, where we use the free action to identify the transition point and transition mechanisms. The second example is based the Staver-Levin model of forest-savanna landscape formation. Here, we show that our path-based framework remains powerful even when direct methods becomes prohibitively inefficient. In the second part of the thesis, we consider non-ergodic systems having deterministic evolution dynamics but random initial data. A prototypical model, which can be considered a zero-temperature Ising model, is discussed. We define and calculate exactly the free energy and the free action. Essentially, in these systems the role of the canonical ensemble is played by the ensemble of initial conditions. The usefulness of this approach is demonstrated by analyzing the laminar-turbulent transition in 2D Poiseuille flow. By extensive numerical computations, we show the existence of a thermodynamic limit and the free energy, action and various thermodynamic relations. Moreover, we show that in the thermodynamic framework, the laminar-turbulent transition can be regarded as a continuous phase transition. Although the set-up of such non-ergodic models are very different from those in classical statistical physics, one can nevertheless uncover interesting thermodynamic structures. Advisors/Committee Members: E, Weinan (advisor).

Subjects/Keywords: Forest-savanna transition; Free energy; Laminar-turbulent transition; Path sampling; Phase transition

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

APA (6^th Edition):

Li, Q. (2016). Phase Transition and Free Action of Non-equilibrium Systems . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01dv13zw63x

Chicago Manual of Style (16^th Edition):

Li, Qianxiao. “Phase Transition and Free Action of Non-equilibrium Systems .” 2016. Doctoral Dissertation, Princeton University. Accessed September 22, 2019. http://arks.princeton.edu/ark:/88435/dsp01dv13zw63x.

MLA Handbook (7^th Edition):

Li, Qianxiao. “Phase Transition and Free Action of Non-equilibrium Systems .” 2016. Web. 22 Sep 2019.

Vancouver:

Li Q. Phase Transition and Free Action of Non-equilibrium Systems . [Internet] [Doctoral dissertation]. Princeton University; 2016. [cited 2019 Sep 22]. Available from: http://arks.princeton.edu/ark:/88435/dsp01dv13zw63x.

Council of Science Editors:

Li Q. Phase Transition and Free Action of Non-equilibrium Systems . [Doctoral Dissertation]. Princeton University; 2016. Available from: http://arks.princeton.edu/ark:/88435/dsp01dv13zw63x

Carnegie Mellon University

28. Zhang, Chiqun. Theory and Computation of Line Defect Fields in Solids and Liquid Crystals.

Degree: 2017, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/1058

► The theory and computation of line defects are discussed in the context of both solids and liquid crystals. This dissertation includes four parts. The Generalized… (more)

▼ The theory and computation of line defects are discussed in the context of both solids and liquid crystals. This dissertation includes four parts. The Generalized Disclination theory is discussed and applied to numerous interfacial and bulk line defect problems. An augmented Oseen-Frank energy as well as a novel 2D-model is proposed and demonstrated for disclination dynamics in liquid crystal. A model based on kinematics and thermodynamics is devised to predict tactoid dynamics during the process of the isotropic-nematic phase transition in LCLC. In the first part of the thesis, the utility of the notion of generalized disclinations in materials science is discussed within the physical context of modeling interfacial and bulk line defects. The Burgers vector of a disclination dipole in linear elasticity is derived, clearly demonstrating the equivalence of its stress field to that of an edge dislocation. An explicit formula for the displacement jump of a single localized composite defect line in terms of given g.disclination and dislocation strengths is deduced based on the Weingarten theorem for g.disclination theory at finite deformation. The Burgers vector of a g.disclination dipole at finite deformation is also derived. In the second part, a numerical method is developed to solve for the stress and distortion fields of g.disclination systems. Problems of small and finite deformation theory are considered. The fields of various line defects and grain/phase boundary problems are approximated. It is demonstrated that while the far-field topological identity of a dislocation of appropriate strength and a disclinationdipole plus a slip dislocation comprising a disconnection are the same, the latter microstructure is energetically favorable. This underscores the complementary importance of all of topology, geometry, and energetics (plus kinetics) in understanding defect mechanics. It is established that finite element approximations of fields of interfacial and bulk line defects can be achieved in a systematic and routine manner, thus contributing to the study of intricate defect microstructures in the scientific understanding and predictive design of materials. In the third part, nonsingular disclination dynamics in a uniaxial nematic liquid crystal is modeled within a mathematical framework where the kinematics is a direct extension of the classical way of identifying these line defects with singularities of a unit vector field representing the nematic director. We devise a natural augmentation of the Oseen-Frank energy to account for physical situations where infinite director gradients have zero associated energy cost, as would be necessary for modeling half-integer strength disclinations within the framework of the director theory. A novel 2D-model of disclination dynamics in nematics is proposed, which is based on the extended Oseen-Frank energy and takes into account thermodynamics and the kinematics of conservation of defect topological charge. We validate this model through computations of disclination…

Subjects/Keywords: generalized disclination; dislocation; disclination; phase boundary; nematic liquid crystal; phase transition

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APA (6^th Edition):

Zhang, C. (2017). Theory and Computation of Line Defect Fields in Solids and Liquid Crystals. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/1058

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):

Zhang, Chiqun. “Theory and Computation of Line Defect Fields in Solids and Liquid Crystals.” 2017. Thesis, Carnegie Mellon University. Accessed September 22, 2019. http://repository.cmu.edu/dissertations/1058.

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

MLA Handbook (7^th Edition):

Zhang, Chiqun. “Theory and Computation of Line Defect Fields in Solids and Liquid Crystals.” 2017. Web. 22 Sep 2019.

Vancouver:

Zhang C. Theory and Computation of Line Defect Fields in Solids and Liquid Crystals. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2019 Sep 22]. Available from: http://repository.cmu.edu/dissertations/1058.

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

Council of Science Editors:

Zhang C. Theory and Computation of Line Defect Fields in Solids and Liquid Crystals. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/1058

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

29. Mouri, Abdelkader. Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase.

Degree: Docteur es, Chimie séparative, matériaux et procédés, 2016, Montpellier

URL: http://www.theses.fr/2016MONTT207

►

Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse… (more)

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Le projet de thèse, mené en collaboration avec le laboratoire Medesis Pharma, porte sur la mise au point de deux formulations pharmaceutiques, une microémulsion inverse et un gel colloïdal, à base de Pécéol®, lécithine, éthanol et eau. Le lithium indiqué dans le traitement de maladies neurodégénératives a été utilisé comme un modèle de principe actif hydrophile dans le cadre de ce projet. Ce travail a été initié par l’étude du comportement de phases du mélange quaternaire Pécéol®/lécithine/éthanol/eau, mettant essentiellement l’accent sur les différents paramètres impliqués dans les transitions de phases, dans le but de déterminer le rôle du Pécéol® et de la lécithine dans la structuration du système.- L’étude des propriétés structurales de la microémulsion, dans le domaine riche en Pécéol®, a montré que la structure du système n’est pas cohérente avec un modèle classique de micelles sphériques, l’hypothèse d’une structure localement lamellaire a été proposée. Les propriétés de solubilisation de la microémulsion ont été évaluées par l’élaboration d’une série de diagrammes de phases pseudo-ternaires, en faisant varier le rapport éthanol/lécithine. Une efficacité optimale a été obtenue pour un rapport éthanol/lécithine égal à 40/60. La formulation optimisée est capable d’incorporer efficacement le lithium (Li), à des concentrations acceptables sans altérer la stabilité du système. L’étude des propriétés d’incorporation du Li dans la microémulsion a montré que le mécanisme d’encapsulation est compatible avec un modèle d’interactions de type drug-surfactant. Les résultats des études de stabilité de la microémulsion vide et chargée en Li menées selon les conditions ICH sont satisfaisants.- La structuration du gel clair, dans le domaine riche en lécithine, a été suivie par des analyses de rhéologie et de microscopie en lumière polarisée en fonction du rapport lécithine/Pécéol®. Les résultats ont montré que les propriétés rhéologiques du gel peuvent être modifiées en ajustant le rapport lécithine/Pécéol®. La caractérisation de la structure du gel clair par diffraction de rayons X aux petits angles (SAXS) et cryofracture conjuguée à la microscopie électronique en transmission (FF-TEM) a mis en évidence une structure anisotrope hexagonale H2. Alors que dans le domaine riche en eau, une structure anisotrope hexagonale inverse H2 et lamellaire Lα a été mise en évidence. Les propriétés rhéologiques modulables du gel dans le domaine riche en lécithine ainsi que sa grande capacité de rétention d’eau, sont particulièrement intéressantes pour une application du gel clair dans le domaine de pharmaceutique et/ou cosmétique.

This thesis project, carried out in collaboration with Medesis Pharma laboratory, is about the development of two pharmaceutical formulations, a reverse microemulsion and a colloidal gel, based on Pécéol®, lécithine, ethanol and water. The indicated lithium in the treatment of neurodegenerative diseases has been used as a hydrophilic principal active model for this project. This work started with the study of…

Advisors/Committee Members: Devoisselle, Jean-Marie (thesis director), Legrand, Philippe (thesis director).

Subjects/Keywords: Transition de phases; Pécéol®; Lithium; Microémulsion; Gel; Phase hexagonale inverse; Phase transition; Peceol®; Lithium; Microemulsion; Gel; Inverted hexagonal phase

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

APA (6^th Edition):

Mouri, A. (2016). Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2016MONTT207

Chicago Manual of Style (16^th Edition):

Mouri, Abdelkader. “Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase.” 2016. Doctoral Dissertation, Montpellier. Accessed September 22, 2019. http://www.theses.fr/2016MONTT207.

MLA Handbook (7^th Edition):

Mouri, Abdelkader. “Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase.” 2016. Web. 22 Sep 2019.

Vancouver:

Mouri A. Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase. [Internet] [Doctoral dissertation]. Montpellier; 2016. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2016MONTT207.

Council of Science Editors:

Mouri A. Optimisation, caractérisation et comportement physico-chimique dans les milieux modèles de nano-objets en phase inverse. : Optimization, characterization and physico-chemical behavior in the model mediums of nano-obejcts in reverse phase. [Doctoral Dissertation]. Montpellier; 2016. Available from: http://www.theses.fr/2016MONTT207

30. Hariri, Ahmad. Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM).

Degree: Docteur es, Electronique des hautes fréquences, photonique et systèmes, 2019, Limoges

URL: http://www.theses.fr/2019LIMO0013

►

Les travaux présentés dans ce manuscrit portent sur la conception, simulation et réalisation des nouvelles structures des commutateurs hyperfréquences basées sur l’intégration des couches minces… (more)

▼

Les travaux présentés dans ce manuscrit portent sur la conception, simulation et réalisation des nouvelles structures des commutateurs hyperfréquences basées sur l’intégration des couches minces des matériaux innovants fonctionnels tels que les matériaux à changement de phase (PCM) et les matériaux à transition de phase (PTM). Le principe de fonctionnement de ces composants repose sur le changement de résistivité présenter par ces matériaux. Nous avons exploité le changement de résistivité réversible du GeTe de la famille des matériaux à changement de phase (PCM) entre les deux états : amorphe à forte résistivité et cristallin à faible résistivité, pour réaliser une nouvelle structure d’un simple commutateur SPST. Ensuite, nous avons intégré ce commutateur dans une nouvelle structure de la matrice de commutation DPDT (Double Port Double Throw) à base de PCM pour l’application dans la charge utile du satellite. Nous avons utilisé la transition isolant-métal présenté par le dioxyde de vanadium (VO2) de la famille des matériaux à transition de phase, pour réaliser une nouvelle structure de commutateur simple à deux terminaux sur une très large bande de fréquence (100 MHz–220 GHz).

The work presented in this manuscript focuses on the design, simulation and realization of new microwave switches structures based on the integration of thin layers of innovative functional materials such as phase change materials (PCM) and phase transition materials. (PTM). The operating principle of these components is based on the change of resistivity present by these materials. We exploited the reversible resistivity change of GeTe of phase change materials family between the two states: amorphous with high resistivity and crystalline with low resistivity to realize a new structure of SPST switch. Then, we have integrated this switch structure on a new structure of DPDT (Double Port Double Throw) switch matrix based on phase change materials for application in satellite payload. We have used the insulatingmetal transition presented by the vanadium dioxide (VO2) of phase transition materials family to realize a new two terminals simple switch structure on a very wide frequency band (100 MHz–220 GHz).

Advisors/Committee Members: Blondy, Pierre (thesis director), Crunteanu-Stànescu, Aurelian (thesis director).

Subjects/Keywords: Commutateurs hyperfréquences; Matériaux à changement de phase; Matériaux à transition de phase; GeTe; Dioxyde de vanadium; Transition isolant-métal; Changement de phase amorphe-cristallin; Microwave switch; Phase change materials; Phase transition materials; GeTe; Vanadium dioxide; Insulating-metal transition; Amorphous- crystalline phase change; 621.381 5

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

APA (6^th Edition):

Hariri, A. (2019). Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM). (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2019LIMO0013

Chicago Manual of Style (16^th Edition):

Hariri, Ahmad. “Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM).” 2019. Doctoral Dissertation, Limoges. Accessed September 22, 2019. http://www.theses.fr/2019LIMO0013.

MLA Handbook (7^th Edition):

Hariri, Ahmad. “Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM).” 2019. Web. 22 Sep 2019.

Vancouver:

Hariri A. Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM). [Internet] [Doctoral dissertation]. Limoges; 2019. [cited 2019 Sep 22]. Available from: http://www.theses.fr/2019LIMO0013.

Council of Science Editors:

Hariri A. Etude de commutateurs hyperfréquences bistables à base des matériaux à changement de phase (PCM) : Study of bi-stables microwave switch based on phase change materials (PCM). [Doctoral Dissertation]. Limoges; 2019. Available from: http://www.theses.fr/2019LIMO0013

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Open Access Theses and Dissertations