You searched for subject:(Absorption enhancement).
Showing records 1 – 20 of
20 total matches.
No search limiters apply to these results.
University of Oxford
1.
Rushworth, Cathy M.
Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies.
Degree: PhD, 2012, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:df00e411-4be9-4816-ae46-a1fe948053b6 
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572686
► Cavity enhanced absorption spectroscopies have earned themselves a place as one of the methods of choice for sensitive absorption measurements on gas-phase samples, but their…
(more)
▼ Cavity enhanced absorption spectroscopies have earned themselves a place as one of the methods of choice for sensitive absorption measurements on gas-phase samples, but their application to liquid samples has so far been more limited. Sensitive short pathlength analysis of liquid samples is required for online analysis of microfluidic samples, which are processed in channels with dimensions of tens to hundreds of micrometres. Microfluidics is important for a range of applications including drug discovery and environmental sensing. This thesis explores the application of cavity enhanced absorption spectroscopies to short pathlength (0.010 mm to 2 mm) analysis of sub-microlitre volumes of liquids. Three experimental set-ups have been been examined. Firstly, a single-wavelength cavity ringdown (CRD) spectrometer operating at 532 nm was assembled using two 99.8% reflectivity mirrors. High optical quality flow cells with short pathlengths ranging from 0.1 mm to 2 mm were inserted into this cavity at Brewster’s angle. The detection limit of the set-up with each inserted flow cell was established using a concentration series of aqueous potassium permanganate (KMnO₄) solutions. For the 1 mm flow cell, a detection limit of 29 nM KMnO₄ or 1.4 x 10⁻⁴ cm⁻¹ was established. Several different types of microfluidic devices were also inserted into the cavity, and it was found that the losses arising from the inserted chip were highly dependent on the method of chip manufacture. The CRD set-up with inserted 1 mm flow cell was applied to the detection of two important species, nitrite and iron(II), via analyte-specific colourimetric reactions. Detection limits of 1.9 nM nitrite and 3.8 nM iron(II) were established. The second experimental set-up utilised broadband, supercontinuum light generated in a 20 m length of nonlinear photonic crystal fibre. Broadband mirrors with around 99% reflectivity over the wavelength range from 400 to 800 nm were used to form the cavity, and a miniature spectrometer was used to wavelength-resolve the time-integrated cavity output. Flow cells and microfluidic chips were inserted into the cavity either at normal incidence or at Brewster’s angle. This set-up was employed for reaction analysis of an iron complexation reaction with bathophenanthroline, and for a model organic reaction, the Diels-Alder reaction between anthracene and 4-phenyl-1,2,4-triazoline-3,5-dione. The same broadband set-up was also used for pH measurements using bromocresol green indicator solution. Using dual-wavelength CRD spectroscopy, the pH sensitivity was established to be around a few milli pH units. Finally, an alternative type of cavity, formed from a loop of optical fibre has been investigated. A novel light-coupler was designed and fabricated in 365 μm core diameter multimode optical fibre. Sample designs employing both direct and evanescent wave absorption were investigated in small-core and large-core optical fibres, and the lowest detection limit of 0.11 cm⁻¹ was determined in direct absorption measurements, with a…
Subjects/Keywords: 537.5352; Laser Spectroscopy; Physical & theoretical chemistry; absorption spectroscopy; cavity enhancement; microfluidics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rushworth, C. M. (2012). Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:df00e411-4be9-4816-ae46-a1fe948053b6 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572686
Chicago Manual of Style (16th Edition):
Rushworth, Cathy M. “Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies.” 2012. Doctoral Dissertation, University of Oxford. Accessed March 02, 2021.
http://ora.ox.ac.uk/objects/uuid:df00e411-4be9-4816-ae46-a1fe948053b6 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572686.
MLA Handbook (7th Edition):
Rushworth, Cathy M. “Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies.” 2012. Web. 02 Mar 2021.
Vancouver:
Rushworth CM. Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies. [Internet] [Doctoral dissertation]. University of Oxford; 2012. [cited 2021 Mar 02].
Available from: http://ora.ox.ac.uk/objects/uuid:df00e411-4be9-4816-ae46-a1fe948053b6 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572686.
Council of Science Editors:
Rushworth CM. Analysis of small volume liquid samples using cavity enhanced absorption spectroscopies. [Doctoral Dissertation]. University of Oxford; 2012. Available from: http://ora.ox.ac.uk/objects/uuid:df00e411-4be9-4816-ae46-a1fe948053b6 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572686
University of New South Wales
2.
Pakhuruddin, Mohd.
Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.
Degree: Photovoltaics & Renewable Energy Engineering, 2016, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/56490
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true
► Incomplete light absorption makes effective light-trapping (LT) crucial for realising higher short-circuit current densities (Jsc) in liquid-phase crystallised silicon (LPC Si) thin-film solar cells on…
(more)
▼ Incomplete light
absorption makes effective light-trapping (LT) crucial for realising higher short-circuit current densities (Jsc) in liquid-phase crystallised silicon (LPC Si) thin-film solar cells on glass superstrate. Through a systematic investigation, this research aims to develop, optimise and incorporate different LT features (improving both light-coupling and light-trapping) into 10 um thin solar cells crystallised by a continuous wave diode laser on borosilicate glass. The features include anti-reflection (AR) layers, back surface reflectors (BSRs), Si texturing and glass texturing. Potential Jsc estimated from optical characterisation is used to optimise different LT features. The optimised features are then incorporated into active solar cells and the actual Jsc is derived from external quantum efficiency measurement.An AR foil is used on the front air-side of the glass to improve broadband light-coupling. With the foil, the Jsc is increased by 1.1 mA/cm2 (5.5%
enhancement). BSRs are evaluated to enhance long wavelengths
absorption. The optimum BSR is found by combining silver nanoparticles, white paint and the AR foil, with Jsc of 23.3 mA/cm2 (18.9%
enhancement).Si texturing is done by wet chemical etching to increase long wavelengths
absorption. Porous mask texturing, ammonium fluoride and potassium hydroxide-based solutions (KOH) are evaluated. KOH-based texturing is the best method, with Jsc up to 25.4 mA/cm2 (24.5%
enhancement), when combined with white paint BSR and AR foil. Glass is mechanically abraded to enhance broadband
absorption. Following abrasion, prolonged glass etching resulting in surface roughness below 600 nm is required to enable a successful crystallisation of the Si films on the textured glass. The films exhibit large grains of several hundred micrometers in width and up to centimeters in length, similar to the films crystallised on planar glass. A significant broadband
absorption enhancement is achieved, but electrical degradation is observed in the solar cells, indicating incompatibility of the e-beam evaporated LPC Si solar cells with the textured superstrate.The most effective LT scheme for the LPC Si solar cells on glass superstrate is realised by the rear Si texturing (with KOH-based solution) combined with white paint BSR and front AR foil, with Jsc of 25.4 mA/cm2 (24.5%
enhancement).
Advisors/Committee Members: Varlamov, Sergey, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW, Huang, Jialiang, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Liquid-phase crystallisation; Absorption enhancement; Light trapping; Polycrystalline silicon
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pakhuruddin, M. (2016). Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Pakhuruddin, Mohd. “Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.” 2016. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021.
http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true.
MLA Handbook (7th Edition):
Pakhuruddin, Mohd. “Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates.” 2016. Web. 02 Mar 2021.
Vancouver:
Pakhuruddin M. Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Mar 02].
Available from: http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true.
Council of Science Editors:
Pakhuruddin M. Development of Light-Trapping Schemes in Evaporated Laser-Crystallised Silicon Thin-Film Solar Cells on Glass Superstrates. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/56490 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40844/SOURCE02?view=true
York University
3.
Tulsiram, Nicholas.
Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells.
Degree: MSc -MS, Chemistry, 2016, York University
URL: http://hdl.handle.net/10315/32288
► Organic photovoltaics (OPVs) are attractive for their inexpensiveness, large-scale fabrication methods, flexibility and semi-transparency. OPVs have lower efficiencies than conventional inorganic semiconductor-based solar cells, and…
(more)
▼ Organic photovoltaics (OPVs) are attractive for their inexpensiveness, large-scale fabrication methods, flexibility and semi-transparency. OPVs have lower efficiencies than conventional inorganic semiconductor-based solar cells, and hence methods to enhance light-harvesting properties are sought-after. Photonic crystals are unique nanomaterials that present the ability to enhance light-harvesting properties through electromagnetic field localization and slow photon effect. In this work, three-dimensional photonic crystals were successfully integrated into the active layers of bulk-heterojunction solar cells by fabricating a series of titanium dioxide inverse opals coated with poly(3-hexylthiophene). The optical, morphological, and charge generation properties of the nanocomposites were investigated. Transient photoinduced
absorption spectroscopy showed enhanced charge generation due to a potential photonic
enhancement and the increased interfacial area of the porous structure. This research serves as a proof of concept, where the photonic properties of inverse opals and their high surface area may be exploited with different materials in other solar cell systems.
Advisors/Committee Members: Chen, Jennifer I-Ling (advisor).
Subjects/Keywords: Chemistry; Solar cells; Bulk heterojunction; Photonic; Photonic crystals; Photoinduced absorption spectroscopy; Hybrid solar cells; Absorption enhancement; Slow photons; Band edge enhancement; Light harvesting; Polymer; Inorganic; P3HT; TiO2
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tulsiram, N. (2016). Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells. (Masters Thesis). York University. Retrieved from http://hdl.handle.net/10315/32288
Chicago Manual of Style (16th Edition):
Tulsiram, Nicholas. “Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells.” 2016. Masters Thesis, York University. Accessed March 02, 2021.
http://hdl.handle.net/10315/32288.
MLA Handbook (7th Edition):
Tulsiram, Nicholas. “Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells.” 2016. Web. 02 Mar 2021.
Vancouver:
Tulsiram N. Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells. [Internet] [Masters thesis]. York University; 2016. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10315/32288.
Council of Science Editors:
Tulsiram N. Probing Charge Generation in 3D Photonic Poly(3-hexylthiophene)/Titanium
Dioxide Nanocomposites for Bulk Heterojunction Solar Cells. [Masters Thesis]. York University; 2016. Available from: http://hdl.handle.net/10315/32288
4.
Hosseini Jebeli, Seyyed Ali.
Absorption Localization in Plasmonic Heterostructures.
Degree: MS, Engineering, 2018, Rice University
URL: http://hdl.handle.net/1911/105745
► Plasmonic nanoparticles have found many applications in different areas such as nanoelectronics, energy harvesting and conversion, and photothermal therapy due to their strong interaction with…
(more)
▼ Plasmonic nanoparticles have found many applications in different areas such as nanoelectronics, energy harvesting and conversion, and photothermal therapy due to their strong interaction with light. The light
absorption of homogenous plasmonic structures is mostly uniform and cannot be engineered easily. In this work, the
absorption localization in heterogeneous structures is presented using different materials in the same structure as well as the same material in heterodimer structures composed of rods of different sizes. Pt decorated gold nanorods are found to have significant heat localization in the Pt particles due to their stronger light
absorption than gold. The localization of
absorption in the Pt is confirmed by performing correlated photoluminescence and scattering measurements as well as FDTD simulations. Additionally, gold nanorods of different sizes are coupled together to form a heterodimer. In this work, the results of changing the gap size between the nanorods are presented. This alters the amount of coupling between nanorods which allows control over the
absorption intensity of each particle. Further, we find that the
absorption hot spots can be switched in these structures by changing the excitation wavelength. Significant
absorption localization is observed in both cases which demonstrates the great potential of plasmonic heterostructures for manipulating light-matter interactions.
Advisors/Committee Members: Link, Stephan (advisor).
Subjects/Keywords: Plasmonic nano particles; Absorption enhancement
…was localized in
the Pt islands and that this absorption enhancement originated from the… …photoluminescence emission in the hybrid nanostructures either because absorption
enhancement increases… …viii
scattering is altered even less than absorption. C) Evolution of FDTD… …D) Corresponding calculated absorption
spectra for the same Pt-decorated Au nanorods… …absorption separately. B-C) The absorption of a core-shell Au-Pt nanorod (total size
of…
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hosseini Jebeli, S. A. (2018). Absorption Localization in Plasmonic Heterostructures. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/105745
Chicago Manual of Style (16th Edition):
Hosseini Jebeli, Seyyed Ali. “Absorption Localization in Plasmonic Heterostructures.” 2018. Masters Thesis, Rice University. Accessed March 02, 2021.
http://hdl.handle.net/1911/105745.
MLA Handbook (7th Edition):
Hosseini Jebeli, Seyyed Ali. “Absorption Localization in Plasmonic Heterostructures.” 2018. Web. 02 Mar 2021.
Vancouver:
Hosseini Jebeli SA. Absorption Localization in Plasmonic Heterostructures. [Internet] [Masters thesis]. Rice University; 2018. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1911/105745.
Council of Science Editors:
Hosseini Jebeli SA. Absorption Localization in Plasmonic Heterostructures. [Masters Thesis]. Rice University; 2018. Available from: http://hdl.handle.net/1911/105745
Rice University
5.
Dong, Liangliang.
Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics.
Degree: PhD, Natural Sciences, 2020, Rice University
URL: http://hdl.handle.net/1911/108130
► Surface plasmon – the electromagnetic interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers…
(more)
▼ Surface plasmon – the electromagnetic interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers studied the dependence of plasmon resonance frequency on the size, shape and dielectric environment of the nanoscale system, mainly for sensing applications. The intense and localized field, generated by two adjacent metallic nanostructures when appropriately illuminated, has been utilized for enhancing the sensitivity of vibrational spectroscopy. The near-field
enhancement is also responsible for benefiting device properties, such as improving nonlinear frequency conversion efficiency. In this thesis, I will present plasmonic structures with interesting optical properties and discuss their applications in infrared spectroscopy, refractive index sensing and subwavelength nonlinear optics.
Advisors/Committee Members: Halas, Naomi (advisor).
Subjects/Keywords: plasmonics; surface-enhancement; infrared absorption spectroscopy; refractive index sensing; third harmonic generation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dong, L. (2020). Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/108130
Chicago Manual of Style (16th Edition):
Dong, Liangliang. “Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics.” 2020. Doctoral Dissertation, Rice University. Accessed March 02, 2021.
http://hdl.handle.net/1911/108130.
MLA Handbook (7th Edition):
Dong, Liangliang. “Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics.” 2020. Web. 02 Mar 2021.
Vancouver:
Dong L. Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics. [Internet] [Doctoral dissertation]. Rice University; 2020. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1911/108130.
Council of Science Editors:
Dong L. Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics. [Doctoral Dissertation]. Rice University; 2020. Available from: http://hdl.handle.net/1911/108130
NSYSU
6.
Gao, Ting-fong.
Synergistic photon absorption enhancement in nanostructured molecular assemblies.
Degree: Master, Chemistry, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-105808
► Molecular photoabsorption enhancement under ambient solar radiations can improve efficiency substantially in renewable energy production. Here, we explore the theoretical basis and experimental evidences that…
(more)
▼ Molecular photoabsorption
enhancement under ambient solar radiations can improve efficiency substantially in renewable energy production. Here, we explore the theoretical basis and experimental evidences that nanostructured molecular assemblies exhibit an unprecedented property of synergistic photon
absorption enhancement. The molecular mechanism of this
enhancement phenomenon originates from the combined effect of the photon-molecule interaction and the electronic energy transfer between two adjacent molecular assemblies. For a natural system, the synergistic photon
absorption enhancement factor of green algae (Chlorella vulgaris) in vivo at 632.8 nm was determined to be 103. This enhanced photon
absorption process in nanostructured molecular assemblies opens a doorway to create entangled double excitons by incoherent solar radiations.
Advisors/Committee Members: Chao-Ming Chiang (chair), Dr. Kuo-mei Chen (committee member), Chie-Tong Kuo (chair).
Subjects/Keywords: electronic energy transfer; synergistic photon absorption enhancement; molecular assemblies; double exciton; nanostructure; renewable energy; quantum entanglement
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gao, T. (2012). Synergistic photon absorption enhancement in nanostructured molecular assemblies. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-105808
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gao, Ting-fong. “Synergistic photon absorption enhancement in nanostructured molecular assemblies.” 2012. Thesis, NSYSU. Accessed March 02, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-105808.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gao, Ting-fong. “Synergistic photon absorption enhancement in nanostructured molecular assemblies.” 2012. Web. 02 Mar 2021.
Vancouver:
Gao T. Synergistic photon absorption enhancement in nanostructured molecular assemblies. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Mar 02].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-105808.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gao T. Synergistic photon absorption enhancement in nanostructured molecular assemblies. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-105808
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Maryland
7.
yuan, zhe.
The effect of surfactant vapor on marangoni convection in absorption and condensation.
Degree: Mechanical Engineering, 2005, University of Maryland
URL: http://hdl.handle.net/1903/3106
► Mass and heat transfer enhancement by the addition of a class of surfactant additives is in common use in absorption machines based on aqueous lithium-bromide…
(more)
▼ Mass and heat transfer
enhancement by the addition of a class of surfactant additives is in common use in
absorption machines based on aqueous lithium-bromide (LiBr). It is observed that the addition of on the order of 100 ppm of a surfactant such as 2-ethyl-hexanol (2EH) introduces Marangoni convection on the liquid surface and thereby enhances
absorption and condensation rates. The Vapor Surfactant Theory (Kulankara and Herold, 2000) proposed that such Marangoni convection is driven by the surface tension gradient caused by surfactant that circulates through the machine and arrives at the liquid surfaces as a vapor by bulk flow along with water vapor.
The objective of this work was to fully understand the vapor surfactant induced
enhancement mechanism and to quantify the relationship between the
enhancement and the key variables. This goal was achieved by conducting experimental and numerical
analyses including the measurement of surface tension with surfactant 2EH in the vapor, determination of 2EH surface concentrations in aqueous LiBr and water, experimental study of Marangoni convection in an
absorption and condensation pool with surfactant 2EH in the vapor and modeling of Marangoni convection in the presence of surfactant vapor.
The surface tensions were measured with controlled 2EH concentration in the vapor by using the drop volume method. The results show that for both aqueous LiBr and water the surface tensions are reduced with increased 2EH concentration in the vapor. The 2EH concentration in the vapor is a primary variable in determining the surface tension of aqueous LiBr. Calculated surface concentrations show that the presence of LiBr results in a reduction in 2EH solubility, and that the surface concentration of 2EH is more sensitive to surfactant in the vapor than to surfactant in the liquid. Furthermore, the experimental and numerical analyses show that surfactant in the vapor alone can initiate the Marangoni convection; the strength of Marangoni convection is primarily dependent on the 2EH concentration in the vapor. The current studies show that surfactant in the vapor is a necessary condition for significant
absorption and condensation
enhancement.
Advisors/Committee Members: Herold, Keith E (advisor).
Subjects/Keywords: Engineering, Mechanical; absorption; Marangoni; Lithium-bromide; surfactant; enhancement
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
yuan, z. (2005). The effect of surfactant vapor on marangoni convection in absorption and condensation. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/3106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
yuan, zhe. “The effect of surfactant vapor on marangoni convection in absorption and condensation.” 2005. Thesis, University of Maryland. Accessed March 02, 2021.
http://hdl.handle.net/1903/3106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
yuan, zhe. “The effect of surfactant vapor on marangoni convection in absorption and condensation.” 2005. Web. 02 Mar 2021.
Vancouver:
yuan z. The effect of surfactant vapor on marangoni convection in absorption and condensation. [Internet] [Thesis]. University of Maryland; 2005. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1903/3106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
yuan z. The effect of surfactant vapor on marangoni convection in absorption and condensation. [Thesis]. University of Maryland; 2005. Available from: http://hdl.handle.net/1903/3106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Zhang, Yunjiang.
Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France.
Degree: Docteur es, Chimie atmosphérique, 2019, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2019SACLV013
► Les aérosols carbonés, qui incluent les aérosols organiques (AO) et le carbone suie (BC), jouent un rôle majeur sur la qualité de l’air et sur…
(more)
▼ Les aérosols carbonés, qui incluent les aérosols organiques (AO) et le carbone suie (BC), jouent un rôle majeur sur la qualité de l’air et sur le climat. Il est donc primordial de pouvoir quantifier leurs sources, ainsi que celles de leurs précurseurs gazeux, pour la mise en œuvre de plans d’action appropriés. Les études de tendance sur la composition chimique de l’atmosphère sont également nécessaires afin d’améliorer les connaissances de l’impact des particules sur le réchauffement climatique, actuel et à venir. Ce travail de thèse a permis d’exploiter les mesures automatiques et in situ des aérosols carbonés réalisées au SIRTA (Site de Recherche par Télédétection Atmosphérique) depuis plus de 6 ans. Cet observatoire appartient au programme européen ACTRIS (infrastructure de recherche européenne sur les aérosols, nuages, et espèces gazeuses réactives). Il est situé à 25 km au sud-ouest de Paris et est représentatif de la pollution de fond en région Ile de France. Les principales sources d’AO ont été discriminées à l’aide de l’outil Positive Matrix Factorization appliqué aux données issus d’un Aerosol Chemical Speciation Monitor (ACSM). Les propriétés d’absorption de la lumière de BC et du brown carbon (BrC) ont été mesurées à l’aide d’un aethalomètre multi-longueurs d’onde. L’ensemble des résultats obtenus indiquent des cycles saisonniers, hebdomadaires et journaliers spécifiques aux différentes fractions des aérosols primaires et secondaires. Ils ont confirmé que l’AO primaire (AOP), provenant essentiellement de la combustion de biomasse et du transport routier, est prépondérant sur la période froide (de novembre à février), alors que le reste de l’année est dominé par des aérosols organiques oxygénés. Parmi ces derniers, une fraction moins oxydée, provenant probablement de façon majeure de précurseurs biogéniques, est prépondérante en été (60% de l’AO en moyenne estivale). Les études de tendance ont montré une légère diminution des concentrations (de l’ordre de 0.05-0.20 µg/m3 par an) de toutes les fractions d’AO identifiées au cours de la période étudiée, hormis pour cette fraction d’AO moins oxydée qui ne présente pas de tendance significative. Concernant les propriétés optiques, une contribution moyenne globalement équivalente à celle de BC a été observée pour le BrC dans le proche ultraviolet en hiver. Par ailleurs, il a été mis en évidence une augmentation significative des propriétés d’absorption du BC liée à des interactions avec les aérosols secondaires en mélange interne, en particulier en été (avec une valeur moyenne de 1.6 pour le paramètre Eabs). La fraction organique la plus oxydée a pu être identifiée comme principale responsable de ce phénomène, faisant des aérosols organiques secondaires l’une des fractions des particules les plus importants à considérer par les modèles climatiques.
Carbonaceous aerosols, including organic aerosols (OA) and black carbon (BC), are playing important roles on air quality and climate change. Therefore, quantifying contribution of their emission sources, as well as…
Advisors/Committee Members: Gros, Valérie (thesis director), Albinet, Alexandre (thesis director), Favez, Olivier (thesis director).
Subjects/Keywords: Qualité de l’air; Aérosols organiques; Carbone suie; Sources; Tendances; Absorption de la lumière; Air quality; Organic aerosols; Black carbon; Sources; Trends; Absorption enhancement; 551.51
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, Y. (2019). Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2019SACLV013
Chicago Manual of Style (16th Edition):
Zhang, Yunjiang. “Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France.” 2019. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 02, 2021.
http://www.theses.fr/2019SACLV013.
MLA Handbook (7th Edition):
Zhang, Yunjiang. “Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France.” 2019. Web. 02 Mar 2021.
Vancouver:
Zhang Y. Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2019. [cited 2021 Mar 02].
Available from: http://www.theses.fr/2019SACLV013.
Council of Science Editors:
Zhang Y. Estimation multi-annuelle des sources d’aérosols organiques et de leurs propriétés d’absorption de la lumière en région Parisienne : Multi-year source apportionment of organic aerosols and their impacts on aerosol light absorption in the Paris region, France. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2019. Available from: http://www.theses.fr/2019SACLV013
Edith Cowan University
9.
Karar, Ayman A.
Surface plasmons for enhanced metal-semiconductor-metal photodetectors.
Degree: 2013, Edith Cowan University
URL: https://ro.ecu.edu.au/theses/593
► Surface Plasmon Polaritons (SPPs) are quantized charge density oscillations that occur when a photon couples to the free electron gas of the metal at the…
(more)
▼ Surface Plasmon Polaritons (SPPs) are quantized charge density oscillations that occur when a photon couples to the free electron gas of the metal at the interface between a metal and a dielectric. The extraordinary properties of SPP allow for sub-diffraction limit waveguiding and localized field enhancement. The emerging field of surface plasmonics has applied SPP coupling to a number of new and interesting applications, such as: Surface Enhanced Raman Spectroscopy (SERS), super lenses, nano-scale optical circuits, optical filters and SPP enhanced photodetectors. In the past decade, there have been several experimental and theoretical research and development activities which reported on the extraordinary optical transmission through subwavelength metallic apertures as well as through periodic metal grating structures. The use of SPP for light absorption enhancement using sub-wavelength metal gratings promises an increased enhancement in light collection efficiency of photovoltaic devices. A subwavelength plasmonic nanostructure grating interacts strongly with the incident light and potentially traps it inside the subsurface region of semiconductor substrates. Among all photodetectors, the Metal-Semiconductor-Metal photodetector (MSM-PD) is the simplest structure. Moreover, due to the lateral geometry of the MSM-PDs, the capacitance of an MSM-PD is much lower than capacitances of p-i-n PDs and Avalanche PDs, making its response time in the range of a few tens of picoseconds for nano-scale spacing between the electrode fingers. These features of simple fabrication and high speed make MSM-PDs attractive and essential devices for high-speed optical interconnects, highsensitivity optical samplers and ultra-wide bandwidth optoelectronic integrated circuits (OEIC) receivers for fibre optic communication systems. However, while MSM-PDs offer faster response than their p-i-n PD and avalanche PD counterparts, their most significant drawbacks are the high reflectivity of the metal fingers and the very-low light transmission through the spacing between the fingers, leading to very low photodetector sensitivity. This thesis proposes, designs and demonstrates the concept of a novel plasmonicbased MSM-PD employing metal nano-gratings and sub-wavelength slits. Various metal nano-gratings are designed on top of the gold fingers of an MSM-PD based on gallium arsenide (GaAs) for an operating wavelength of 830 nm to create SPP-enhanced MSM-PDs. Both the geometry and light absorption near the designed wavelength are theoretically and experimentally investigated.
Finite Difference Time Domain (FDTD) simulation is used to simulate and design plasmonic MSM-PDs devices for maximal field enhancement. The simulation results show more than 10 times enhancement for the plasmonic nano-grating MSM-PD compared with the device without the metal nano-gratings, for 100 nm slit difference, due to the improved optical signal propagation through the nano-gratings. A dual beam FIB/ SEM is employed for the fabrication of metal nano-gratings and the…
Subjects/Keywords: FDTD analysis; msm-pd; nanophotonics; sub-wavelength aperture; surface plasmon polaritons; absorption enhancement; plasmonic nano-gratings; Engineering; Materials Science and Engineering; Semiconductor and Optical Materials
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Karar, A. A. (2013). Surface plasmons for enhanced metal-semiconductor-metal photodetectors. (Thesis). Edith Cowan University. Retrieved from https://ro.ecu.edu.au/theses/593
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karar, Ayman A. “Surface plasmons for enhanced metal-semiconductor-metal photodetectors.” 2013. Thesis, Edith Cowan University. Accessed March 02, 2021.
https://ro.ecu.edu.au/theses/593.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karar, Ayman A. “Surface plasmons for enhanced metal-semiconductor-metal photodetectors.” 2013. Web. 02 Mar 2021.
Vancouver:
Karar AA. Surface plasmons for enhanced metal-semiconductor-metal photodetectors. [Internet] [Thesis]. Edith Cowan University; 2013. [cited 2021 Mar 02].
Available from: https://ro.ecu.edu.au/theses/593.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karar AA. Surface plasmons for enhanced metal-semiconductor-metal photodetectors. [Thesis]. Edith Cowan University; 2013. Available from: https://ro.ecu.edu.au/theses/593
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
North-West University
10.
Venter, Johannes Petrus.
Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
.
Degree: 2005, North-West University
URL: http://hdl.handle.net/10394/937
► The absorption enhancing ability of chitosan, a linear polysaccharide, is mediated by protonated amino groups on the C-2 position of the molecules that induce interaction…
(more)
▼ The absorption enhancing ability of chitosan, a linear polysaccharide, is mediated
by protonated amino groups on the C-2 position of the molecules that induce
interaction with the anionic sites on the cell membranes to subsequently alter
tight junction integrity. In neutral and basic environments, such as those found in
the small and large intestines, most chitosan molecules will lose their charge and
precipitate from solution rendering it ineffective as an absorption enhancer. To
increase the solubility of this polymer, methylation of the amino groups on the C-
2 position was proposed.
A partially quaternised and water soluble derivative of chitosan, N-trimethyl
chitosan chloride (TMC), which exhibits superior solubility in a basic environment
compared with other chitosan salts was synthesised and included in a chitosan
microbead solid drug delivery system. Two TMC derivatives were synthesised
by reductive methylation from high and medium molecular weight Chitoclear™
chitosan respectively. The degree of quaternisation calculated from the 1H-NMR
spectra for the medium molecular weight TMC (TMC-M) and the high molecular
weight TMC (TMC-H) polymers were 74.7 % and 48.5 % respectively. The mean
molecular weights of the synthesised TMC-M and TMC-H polymers were 64 100
g/mole and 233 700 g/mole respectively. The effect of different concentrations
TMC-M and TMC-H on chitosan microbeads was studied with results obtained
from scanning electron microscopy (SEM), TMC loading capacity and microbead
swelling behaviour. After selection of the most suitable TMC concentration, the
effect of varying concentration (0.1, 0.2 and 0.5 %) additives on TMC and
ibuprofen release was studied. Commonly used modified cellulose gum (Ac-di-sol®(ADS)), sodium starch glycolate (Explotab®(EXP)) and ascorbic acid (AA)
were added as disintegrants to different microbead formulations to promote
release of both the ibuprofen as model drug and TMC from the beads. It was
noticed that the loading (% drug loading capacity) of TMC-M was much lower
than that obtained with TMC-H while the inclusion of different additives in varying
concentrations did not seem to have a profound influence on the loading of either
TMC-M or TMC-H. It was further noticed from the fit factors (f1 and f2) for
dissolution profiles of eighteen chitosan microbead variations that the formulation
containing TMC-H and 0.5% (w/v) ascorbic acid was the only formulation with a
significantly higher ibuprofen and TMC-H release profile compared to all other
formulations tested.
The chitosan microbead formulation containing 2%(w/v) TMC-H and 0.5 % (w/v)
ascorbic acid (H-AA-0.5) was used for in vitro absorption studies through rat
intestine in Sweetana-Grass diffusion chambers. Chitosan containing TMC-H
(no ascorbic acid) (CHIT-H) only and a plain chitosan microbead (CHIT)
formulation was used as control formulations during the in vitro studies. Although
the H-AA-0.5 formulation exhibited the highest transport rate for ibuprofen, the
mean rate of transport…
Subjects/Keywords: Absorption enhancement;
Quaternised chitosan;
Mucoadhesion;
Microbeads;
Ibuprofen;
Sweetana-Grass diffusion chambers
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Venter, J. P. (2005). Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
. (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Venter, Johannes Petrus. “Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
.” 2005. Thesis, North-West University. Accessed March 02, 2021.
http://hdl.handle.net/10394/937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Venter, Johannes Petrus. “Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
.” 2005. Web. 02 Mar 2021.
Vancouver:
Venter JP. Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
. [Internet] [Thesis]. North-West University; 2005. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10394/937.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Venter JP. Design and evaluation of chitosan and N-trimethyl chitosan chloride microspheres for intestinal drug delivery / Johannes Petrus Venter
. [Thesis]. North-West University; 2005. Available from: http://hdl.handle.net/10394/937
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Univerzitet u Beogradu
11.
Đeković Šević, Milica R., 1981-.
Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom.
Degree: Tehnološko-metalurški fakultet, 2018, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:18260/bdef:Content/get
► Hemija i hemijska tehnologija - Hemijsko inženjerstvo / Chemistry and chemical technology - Chemical engineering
Apsorpcija ozona u vodi i vodenim rastvorima pod različitim operativnim…
(more)
▼ Hemija i hemijska tehnologija - Hemijsko
inženjerstvo / Chemistry and chemical technology - Chemical
engineering
Apsorpcija ozona u vodi i vodenim rastvorima pod
različitim operativnim uslovima ispitivana je u dva tipa reaktora
za izvođenje procesa gas-tečnost: barbotažnoj koloni sa dvofluidnom
mlaznicom i barbotažnoj koloni sa fritom...
Advisors/Committee Members: Bošković-Vragolović, Nevenka, 1964-.
Subjects/Keywords: ozone; absorption; volumetric mass transfer
coefficient; bubble column with two-fluid nozzle gas distributor;
bubble column with the frit; enhancement factor; instantaneous
chemical reaction
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Đeković Šević, Milica R., 1. (2018). Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:18260/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Đeković Šević, Milica R., 1981-. “Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom.” 2018. Thesis, Univerzitet u Beogradu. Accessed March 02, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:18260/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Đeković Šević, Milica R., 1981-. “Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom.” 2018. Web. 02 Mar 2021.
Vancouver:
Đeković Šević, Milica R. 1. Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom. [Internet] [Thesis]. Univerzitet u Beogradu; 2018. [cited 2021 Mar 02].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18260/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Đeković Šević, Milica R. 1. Apsorpcija ozona u vodi i vodenim rastvorima u
barbotažnoj koloni sa dvofluidnom mlaznicom. [Thesis]. Univerzitet u Beogradu; 2018. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18260/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
12.
Ahmadpanahi, S.H.
Light trapping in Si thin film solar cell.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc
;
urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc
;
b4288708-cc36-40de-966a-534b7090a7fc
;
10.4233/uuid:b4288708-cc36-40de-966a-534b7090a7fc
;
urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc
;
http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc
► This thesis is structured in six distinct chapters. In Chapter 1 a general introduction is given to address the main challenge in thin-film silicon solar…
(more)
▼ This thesis is structured in six distinct chapters. In Chapter 1 a general introduction is given to address the main challenge in thin-film silicon solar cells and to motivate the need for light trapping. This chapter also describes the main focus of this thesis and the urge to understand the light behaviour inside a periodic waveguide thin film. This is followed by Chapter 2, which provides the mathematical background and the frame work which has been used throughout the thesis. This chapter presents some practical details and calculation techniques which have been used to obtain our result. In Chapter 3, a semi-analytical approach is introduced to calculate the contribution of guided and nonguided resonances to total
absorption of a grating waveguide structure under normal incidence. In this approach, we use Fourier expansion to calculate the energy spectral density of the electric field inside the absorber. In this way, the weight of each resonance in total
absorption is defined for a large wavelength range for TM and TE polarization. Additionally, the proposed mathematical model is supported by numerical and rigorous calculations, using a software based on the finite element method. This approach is extended for oblique incidence in Chapter 4. In this chapter it is explained howthe variation of tangential and normal components for TM electric field under oblique incidence influences the accuracy of numerical calculation. The correlation between the density of modes and the
absorption peaks due to guided mode excitation is also presented in this chapter. Chapter 5 focuses on calculating the maximum
absorption enhancement achieved by each type of resonance in a waveguide structure with symmetric and asymmetric gratings. In this chapter a different approach is introduced to count the number of resonances in a grating waveguide structure, at each frequency. Then, temporal coupledmode theory is used to calculate the maximum
absorption enhancement for each diffraction order. This approach is extended for a thin film with double-side texturing. Chapter 6 provides the conclusion of the thesis.
Advisors/Committee Members: Isabella, O., Zeman, M., Delft University of Technology.
Subjects/Keywords: Light trapping; Diffraction and gratings; Thin film; Solar Cells; Absorption enhancement
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ahmadpanahi, S. H. (2019). Light trapping in Si thin film solar cell. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; b4288708-cc36-40de-966a-534b7090a7fc ; 10.4233/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc
Chicago Manual of Style (16th Edition):
Ahmadpanahi, S H. “Light trapping in Si thin film solar cell.” 2019. Doctoral Dissertation, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; b4288708-cc36-40de-966a-534b7090a7fc ; 10.4233/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc.
MLA Handbook (7th Edition):
Ahmadpanahi, S H. “Light trapping in Si thin film solar cell.” 2019. Web. 02 Mar 2021.
Vancouver:
Ahmadpanahi SH. Light trapping in Si thin film solar cell. [Internet] [Doctoral dissertation]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; b4288708-cc36-40de-966a-534b7090a7fc ; 10.4233/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc.
Council of Science Editors:
Ahmadpanahi SH. Light trapping in Si thin film solar cell. [Doctoral Dissertation]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; b4288708-cc36-40de-966a-534b7090a7fc ; 10.4233/uuid:b4288708-cc36-40de-966a-534b7090a7fc ; urn:NBN:nl:ui:24-uuid:b4288708-cc36-40de-966a-534b7090a7fc ; http://resolver.tudelft.nl/uuid:b4288708-cc36-40de-966a-534b7090a7fc
Queensland University of Technology
13.
Clark, Brian.
The behaviour of rollover protective structures subjected to static and dynamic loading conditions.
Degree: 2005, Queensland University of Technology
URL: https://eprints.qut.edu.au/16292/
► The Rollover of heavy vehicles operating in the construction, mining and agricultural sectors is a common occurrence that may result in death or severe injury…
(more)
▼ The Rollover of heavy vehicles operating in the construction, mining and agricultural sectors is a common occurrence that may result in death or severe injury for the vehicle occupants. Safety frames called ROPS (Rollover Protective Structures) that enclose the vehicle cabin, have been used by heavy vehicle manufacturers to provide protection to vehicle occupants during rollover accidents. The design of a ROPS requires that a dual criteria be fulfilled that ensures that the ROPS has sufficient stiffness to offer protection, whilst possessing an appropriate level of flexibility to absorb some or most of the impact energy during a roll. Over the last four decades significant research has been performed on these types of safety devices which has resulted in the generation of performance standards that may be used to assess the adequacy of a ROPS design for a particular vehicle type. At present these performance standards require that destructive full scale testing methods be used to assess the adequacy of a ROPS. This method of ROPS certification can be extremely expensive given the size and weight of many vehicles that operate in these sectors. The use of analytical methods to assess the performance of a ROPS is currently prohibited by these standards. Reasons for this are attributed to a lack of available fundamental research information on the nonlinear inelastic response of safety frame structures such as this. The main aim of this project was to therefore generate fundamental research information on the nonlinear response behaviour of ROPS subjected to both static and dynamic loading conditions that could be used to contribute towards the development of an efficient analytical design procedure that may lessen the need for destructive full scale testing. In addition to this, the project also aspired to develop methods for promoting increased levels of operator safety during vehicle rollover through enhancing the level of energy absorbed by the ROPS. The methods used to fulfil these aims involved the implementation of an extensive analytical modelling program using Finite Element Analysis (FEA) in association with a detailed experimental testing program. From these studies comprehensive research information was developed on both the dynamic impact response and energy absorption capabilities of these types of structures. The established finite element models were then used to extend the investigation further and to carry out parametric studies. Important parameters such as ROPS post stiffness, rollslope inclination and impact duration were identified and their effects quantified. The final stage of the project examined the enhancement of the energy absorption capabilities of a ROPS through the incorporation of a supplementary energy absorbing device within the frame work of the ROPS. The device that was chosen for numerical evaluation was a thin walled tapered tube known as frusta that was designed to crush under a sidewards rollover and hence lessen the energy absorption demand placed upon the ROPS. The inclusion of…
Subjects/Keywords: Rollover Protective Structures; ROPS; Safety; Occupant protection; Impact; Energy absorption; Destructive testing; Dynamic loading; Impulse loads; Finite Element Analysis (FEA); Energy Absorption Enhancement
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Clark, B. (2005). The behaviour of rollover protective structures subjected to static and dynamic loading conditions. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16292/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Clark, Brian. “The behaviour of rollover protective structures subjected to static and dynamic loading conditions.” 2005. Thesis, Queensland University of Technology. Accessed March 02, 2021.
https://eprints.qut.edu.au/16292/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Clark, Brian. “The behaviour of rollover protective structures subjected to static and dynamic loading conditions.” 2005. Web. 02 Mar 2021.
Vancouver:
Clark B. The behaviour of rollover protective structures subjected to static and dynamic loading conditions. [Internet] [Thesis]. Queensland University of Technology; 2005. [cited 2021 Mar 02].
Available from: https://eprints.qut.edu.au/16292/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Clark B. The behaviour of rollover protective structures subjected to static and dynamic loading conditions. [Thesis]. Queensland University of Technology; 2005. Available from: https://eprints.qut.edu.au/16292/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Western Ontario
14.
Pasche, Anastasia.
Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells.
Degree: 2015, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/3388
► Solar energy is a promising solution towards meeting the world’s ever-growing energy demand. Dye-sensitized solar cells (DSSCs) are hybrid organic-inorganic solar cells with potential for…
(more)
▼ Solar energy is a promising solution towards meeting the world’s ever-growing energy demand. Dye-sensitized solar cells (DSSCs) are hybrid organic-inorganic solar cells with potential for commercial application, but are plagued by inefficiency due to their poor sunlight absorption. Silver nanoparticles have been shown to enhance the absorptive properties of DSSCs, but their plasmonic resonance causes local hot spots, resulting in cell deterioration. This thesis studies the mitigation of thermal energy loss of plasmon-enhanced DSSCs by the co-incorporation of zirconia, a well-known thermostabilizer, into the cell’s photoactive material. TiO2 was also synthesized using green bio-sourced solvents in supercritical CO2 to compare its performance in DSSCs to conventionally-synthesized TiO2. Using an integrated approach to materials synthesis, characterization, cell fabrication, and solar simulation testing, it is shown that 5 molar % zirconia doping improves the photovoltaic performance of DSSCs by as much as 44%. Further, two optimized plasmonic cell architectures are presented that increase optical absorption and photocurrent in DSSCs. The integration of these nanomaterials into solar cells highlights easy fabrication methods, contributes to the development and commercialization of inexpensive and high-efficiency DSSCs, and may benefit other types of solar-harvesting devices.
Subjects/Keywords: photovoltaics; dye-sensitized solar cell; titanium dioxide; zirconia thermostabilizing dopant; silver plasmonic nanoparticles; atomic layer deposition; absorption enhancement; green bio-sourced solvents; supercritical carbon dioxide; Biology and Biomimetic Materials; Chemical Engineering; Nanoscience and Nanotechnology; Semiconductor and Optical Materials
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Pasche, A. (2015). Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3388
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pasche, Anastasia. “Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells.” 2015. Thesis, University of Western Ontario. Accessed March 02, 2021.
https://ir.lib.uwo.ca/etd/3388.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pasche, Anastasia. “Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells.” 2015. Web. 02 Mar 2021.
Vancouver:
Pasche A. Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Mar 02].
Available from: https://ir.lib.uwo.ca/etd/3388.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pasche A. Doping Plasmon-Enhanced TiO2 with Zirconia to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/3388
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
15.
Wang, Wei, 1983 July 24-.
Plasmonic properties of subwavelength structures and their applications in optical devices.
Degree: PhD, Materials Science and Engineering, 2010, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2010-12-2243
► A metallic hole array of a rectangular converging-diverging channel (RCDC) shape exhibits extraordinary transmission for wavelengths larger than the periodicity of the holes. We use…
(more)
▼ A metallic hole array of a rectangular converging-diverging channel (RCDC) shape exhibits extraordinary transmission for wavelengths larger than the periodicity of the holes. We use a three-dimensional (3D) finite element method to analyze the transmission characteristics of two-dimensional metallic hole arrays (2D-MHA) with RCDC. For a straight channel MHA, when the aperture size is reduced, the transmission peaks have a blue-shift. The same result is observed for a smaller gap throat for the RCDC structure. For the rectangular holes with a high length-width ratio, a similar blue-shift in the transmission peaks as well as a narrower full width at half maximum (FWHM) are observed. The asymmetry from the rectangular shape gives this structure high selectivity for light with different polarizations. Furthermore, the RCDC shape gives extra degrees of geometrical variables to 2D-MHA for tuning the location of the transmission peak and the FWHM. Tunable extraordinary transmission via changing temperature of a porous metallic layer on top of a thin layer of dielectric strontium titanate (STO) is then studied. The metallic layer has a through-hole array and each hole has a circular converging-diverging channel (CDC) shape, which induces the excitation of surface plasmon polaritons (SPPs) and then results in a controllable extraordinary optical transmission in the terahertz (THz) frequency range. We use a three-dimensional (3D) finite element method to analyze the transmission characteristics of the structure. Location and magnitude of the transmission peaks can be adjusted by the hole size, converging angle, and thicknesses of metal and STO layers. Remarkably, the suggested structure presents a strong transmission dependency on temperature, which offers a new approach to actively and externally tune the transmission. Currently, the performances of thin film solar cells are limited by poor light
absorption and carrier collection. In this research, large, broadband, and polarization-insensitive light
absorption enhancement is realized via integrating with unique metallic nanogratings. Through simulation, three possible mechanisms are identified to be responsible for such an enormous
enhancement. A test for totaling the
absorption over the solar spectrum shows an up to ~30% broadband
absorption enhancement when comparing to bare thin film cells. Overall performance of a thin film solar cell is determined by the efficiency of conversing photons to electrons that include light
absorption, carrier generation and carrier collection processes. Photon management via hybrid designing has been emerging as a powerful means to further boost the conversion efficiency. Here a new nanograting solar cell design, which can be universal and a new solar cell platform technology, is proposed with goals to achieve large
enhancement on broadband light
absorption and carrier generation, most importantly, under the much reduced usage of active and non-earth-abundant materials. A test for the short circuit current density in CuIn[subscript…
Advisors/Committee Members: Shi, Li, Ph. D. (advisor), Chen, Shaochen (advisor), Zhang, Xiaojing (committee member), Ferreira, Paulo J. (committee member), Shvets, Gennady (committee member).
Subjects/Keywords: Plasmonic; Subwavelength structures; Optical devices; Extraordinary optical transmission; Thin film solar cell; Absorption enhancement; Extraordinary transmission; Metallic hole arrays; Nano-optics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, Wei, 1. J. 2. (2010). Plasmonic properties of subwavelength structures and their applications in optical devices. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-12-2243
Chicago Manual of Style (16th Edition):
Wang, Wei, 1983 July 24-. “Plasmonic properties of subwavelength structures and their applications in optical devices.” 2010. Doctoral Dissertation, University of Texas – Austin. Accessed March 02, 2021.
http://hdl.handle.net/2152/ETD-UT-2010-12-2243.
MLA Handbook (7th Edition):
Wang, Wei, 1983 July 24-. “Plasmonic properties of subwavelength structures and their applications in optical devices.” 2010. Web. 02 Mar 2021.
Vancouver:
Wang, Wei 1J2. Plasmonic properties of subwavelength structures and their applications in optical devices. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2010. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2152/ETD-UT-2010-12-2243.
Council of Science Editors:
Wang, Wei 1J2. Plasmonic properties of subwavelength structures and their applications in optical devices. [Doctoral Dissertation]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-12-2243
16.
Lei, Ziying.
Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions.
Degree: MS, Civil Engineering, 2016, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1480623077018431
► Air pollution, one of the most concerning and widespread environmental issues has grown in importance in the world. The carbonaceous aerosols significantly contribute to air…
(more)
▼ Air pollution, one of the most concerning and
widespread environmental issues has grown in importance in the
world. The carbonaceous aerosols significantly contribute to air
pollution, which not only causes public health concern, but also
impacts climate change. The aerosol particles have properties to
absorb or scatter solar radiation and thermal radiation; therefore,
they play an important role in climate change. In order to improve
the understanding and control the aerosol particles, it is crucial
to study aerosol size distribution and chemical compounds. Black
carbon is the strongest radiative absorber suspends in the
atmosphere, and can have great influence on climate change. This
study investigates the size-selected black carbon optical
properties under laboratory conditions with varied relative
humidity referred to “dry”, “humid”, and “wet” respectively. The
single scattering albedo that measures the relative amount of
aerosol light extinction due to scattering, and the
absorption
enhancement due to lensing effect are measured in this study, and
compared with the modeling results based on Mie theory, which is
used to predict the
absorption and scattering of light by a
spherical particle.The results show that the single scattering
albedo under the dry, humid, and wet conditions are similar, while
the single scattering albedo for black carbon particles that have
undergone heating to 160 °C is slightly greater than other three
conditions. In general, with respect to particle size, single
scattering albedo increases with smaller particle size and then
levels off at larger size diameters. In addition, the
absorption
enhancement for black carbon particles is estimated in this study,
and it ranges from 1 to 2.5. The values based on observations
generally follow the predicted trend from Mie theory. Comparing the
observed and modeled values suggests that 25%-50% of the total
particle diameter is attributable to coating material. Dry black
carbon particles do not have high
absorption enhancement because
they likely have no or thin coating materials. However, the
absorption enhancement for humid particles and wet particles are
higher than the dry particles, likely due to an enhanced lensing
effect due to water uptake by the black carbon particles.Future
study will focus on improving the understanding of black carbon
optical properties and accuracy of experimental results. Further
research is recommended to focus on ranges of BC particles with the
diameters smaller than 100 nm and larger than 650 nm, which are not
included in this study and constrain the particle charge
units.
Advisors/Committee Members: May, Andrew (Advisor).
Subjects/Keywords: Environmental Engineering; Environmental Science; Environmental Studies; Black Carbon, aerosol, single scattering albedo,
absorption enhancement
…Absorption Enhancement .............................................................40
4.1… …Absorption Enhancement.....................................................................40
4.2… …Absorption Enhancement Modeling ....................................................41
x
4.3… …47
Table 3. Previous study for absorption enhancement of BC particles with
different… …Absorption enhancement as a function of particle size for both
experimental observations (…
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lei, Z. (2016). Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1480623077018431
Chicago Manual of Style (16th Edition):
Lei, Ziying. “Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions.” 2016. Masters Thesis, The Ohio State University. Accessed March 02, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1480623077018431.
MLA Handbook (7th Edition):
Lei, Ziying. “Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions.” 2016. Web. 02 Mar 2021.
Vancouver:
Lei Z. Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions. [Internet] [Masters thesis]. The Ohio State University; 2016. [cited 2021 Mar 02].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1480623077018431.
Council of Science Editors:
Lei Z. Investigation of Optical Properties of Size-Selected Black
Carbon Under Controlled Laboratory Conditions. [Masters Thesis]. The Ohio State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1480623077018431
University of Waterloo
17.
Jafari Salim, Amir.
Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation.
Degree: 2014, University of Waterloo
URL: http://hdl.handle.net/10012/8431
► In this thesis, superconducting nanostructures for quantum detection of electromagnetic radiation are studied. In this regard, electrodynamics of topological excitations in 1D superconducting nanowires and…
(more)
▼ In this thesis, superconducting nanostructures for quantum detection of electromagnetic
radiation are studied. In this regard, electrodynamics of topological excitations in 1D
superconducting nanowires and 2D superconducting nanostrips is investigated. Topological excitations in superconducting nanowires and nanostrips lead to crucial deviation from the bulk properties. In 1D superconductors, topological excitations are phase slippages of the order parameter in which the magnitude of the order parameter locally drops to zero and the phase jumps by integer multiple of 2π. We investigate the effect of high-frequency field on 1D superconducting nanowires and derive the complex conductivity. Our study reveals that the rate of the quantum phase slips (QPSs) is exponentially enhanced under high-frequency irradiation. Based on this finding, we propose an energy-resolving terahertz radiation detector using superconducting nanowires. In superconducting nanostrips, topological fluctuations are the magnetic vortices. The motion of magnetic vortices result in dissipative processes that limit the efficiency of devices using superconducting nanostrips.
It will be shown that in a multi-layer structure, the potential barrier for vortices to penetrate inside the structure is elevated. This results in significant reduction in dissipative
process. In superconducting nanowire single photon detectors (SNSPDs), vortex motion
results in dark counts and reduction of the critical current which results in low efficiency
in these detectors. Based on this finding, we show that a multi-layer SNSPD is capable of approaching characteristics of an ideal single photon detector in terms of the dark count and quantum efficiency. It is shown that in a multi-layer SNSPD the photon coupling
efficiency is dramatically enhanced due to the increase in the optical path of the incident
photon.
Subjects/Keywords: superconducting nanostructures; superconducting nanowires; superconducting nanostrips; complex conductivity; enhancement of quantum tunnelling; energy resolving detector; superconducting nanowire single photon detector (SNSPD); multi-layer superconducting nanostructure; vortex; pancake vortex; dark count; photon absorption; quantum efficiency; semi-classical physics; Golubev-Zaikin theory; phase slips; quantum tunnelling; vortex crossing; Mooij-Nazarov duality; terahertz (THz) detector; quantum phase slip (QPS); superconductivity
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jafari Salim, A. (2014). Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8431
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jafari Salim, Amir. “Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation.” 2014. Thesis, University of Waterloo. Accessed March 02, 2021.
http://hdl.handle.net/10012/8431.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jafari Salim, Amir. “Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation.” 2014. Web. 02 Mar 2021.
Vancouver:
Jafari Salim A. Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10012/8431.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jafari Salim A. Superconducting Nanostructures for Quantum Detection of Electromagnetic Radiation. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8431
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Bradford
18.
Derdar, Mawaheb M. Zarok.
Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor.
Degree: PhD, 2010, University of Bradford
URL: http://hdl.handle.net/10454/4872
► Due to the ever increasing concerns about pollutants and contaminants found in water, new treatment technologies have been developed. Ozonation is one of such technologies.…
(more)
▼ Due to the ever increasing concerns about pollutants and contaminants found in water, new treatment technologies have been developed. Ozonation is one of such technologies. It has been widely applied in the treatment of pollutants in water and wastewater treatment processes. Ozone has many applications such as oxidation of organic components, mineral matter, inactivation of viruses, cysts, bacteria, removal of trace pollutants like pesticides and solvents, and removal of tastes and odours. Ozone is the strongest conventional oxidant that can result in complete mineralisation of the organic pollutants to carbon dioxide and water. Because ozone is unstable, it is generally produced onsite in gas mixtures and is immediately introduced to water using gas/liquid type reactors (e.g. bubble columns). The ozone reactions are hence of the type gas liquid reactions, which are complex to model since they involve both chemical reactions, which occur in the liquid phase, and mass transfer from the gas to the liquid phase. This study focuses on two aspects: mass transfer and chemical reactions in multicomponent systems. The mass transfer parameters were determined by experiments under different conditions and the chemical reactions were studied using single component and multicomponent systems. Two models obtained from the literature were adapted to the systems used in this study. Mass transfer parameters in the semi-batch reactor were determined using oxygen and ozone at different flow rates in the presence and absence of t-butanol. t-Butanol is used as a radical scavenger in ozonation studies and it has been found to affect the gas-liquid mass transfer rates. An experimental study was carried out to investigate the effects of t-butanol concentrations on the physical properties of aqueous solutions, including surface tension and viscosity. It was found that t-butanol reduced both properties by 4% for surface tension and by a surprising 30% for viscosity. These reductions in the solution physical properties were correlated to enhancement in the mass transfer coefficient, kL. The mass transfer coefficient increased by about 60% for oxygen and by almost 50% for ozone. The hydrodynamic behaviour of the system used in this work was characterised by a homogeneous bubbling regime. It was also found that the gas holdup was significantly enhanced by the addition of t-butanol. Moreover, the addition of t-butanol was found to significantly reduce the size of gas bubbles, leading to enhancement in the volumetric mass transfer coefficient, kLa. The multicomponent ozonation was studied with two systems, slow reactions when alcohols were used and fast reactions when endocrine disrupting compounds were used. ii These experiments were simulated by mathematical models. The alcohols were selected depending on their volatilization at different initial concentrations and different gas flow rates. The degradation of n-propanol as a single compound was studied at the lowest flow rate of 200 mL/min. It was found that the degradation of n-propanol…
Subjects/Keywords: 628; Ozone absorption; Modelling; Multicomponent; Mass transfer coefficient; Enhancement factor; Chemical reaction; Gas/liquid reactors; Water pollutants; Water contaminants; Water treatment; Wastewater treatment
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Derdar, M. M. Z. (2010). Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/4872
Chicago Manual of Style (16th Edition):
Derdar, Mawaheb M Zarok. “Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor.” 2010. Doctoral Dissertation, University of Bradford. Accessed March 02, 2021.
http://hdl.handle.net/10454/4872.
MLA Handbook (7th Edition):
Derdar, Mawaheb M Zarok. “Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor.” 2010. Web. 02 Mar 2021.
Vancouver:
Derdar MMZ. Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor. [Internet] [Doctoral dissertation]. University of Bradford; 2010. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10454/4872.
Council of Science Editors:
Derdar MMZ. Experimental and kinetic modelling of multicomponent gas/liquid ozone reactions in aqueous phase : experimental investigation and Matlab modelling of the ozone mass transfer and multicomponent chemical reactions in a well agitated semi-batch gas/liquid reactor. [Doctoral Dissertation]. University of Bradford; 2010. Available from: http://hdl.handle.net/10454/4872
University of Toronto
19.
Zilkie, Aaron John.
High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.
Degree: 2008, University of Toronto
URL: http://hdl.handle.net/1807/17265
► This thesis reports an experimental characterization of the ultrafast gain and refractive index dynamics of a novel InAs/InGaAsP/InP quantum-dot (QD) semiconductor optical amplifier (SOA) operating…
(more)
▼ This thesis reports an experimental characterization of the ultrafast gain and refractive index dynamics of a novel InAs/InGaAsP/InP quantum-dot (QD) semiconductor optical amplifier (SOA) operating near 1.55-µm wavelengths, assessing its high-speed performance characteristics for the first time. The thesis also studies the influence of the degree of quantum confinement on the dynamics of SOAs by comparing the zero-dimensional (0-D) QD's dynamics to those in 1-D InAs/InAlGaAs/InP quantum-dash (QDash), and 2-D InGaAsP/InGaAsP/InP quantum-well (QW) SOAs, both of which also operate near 1.55-µm wavelengths, and are made with matching or similar materials and structures. The ultrafast (around 1 ps) and long-lived (up to 2 ns) amplitude and phase dynamics of the SOAs are characterized via advanced heterodyne pump-probe measurements with 150-femtosecond resolution. It is found that the QD SOA has an 80-picosecond amplitude, and 110-picosecond phase recovery lifetime in the gain regime, 4-6 times faster than the QDash and QW recovery lifetimes, as well as reduced ultrafast transients, giving it the best properties for high-speed (> 100 Gb/s) all-optical signal processing in the important telecommunications wavelength bands.
An impulse response model is developed and used to analyze the dynamics, facilitating a comparison of the gain compression factors, time-resolved linewidth enhancement factors (alpha-factors), and instantaneous dynamic coefficients (two-photon absorption and nonlinear refractive-index coefficients) amongst the three structures. The quantum-dot device is found to have the lowest effective alpha-factor, 2-10, compared to 8-16 in the QW, as well as time-resolved alpha-factors lower than in the QW—promising for reduced-phase-transient operation at high bitrates. Significant differences in the alpha-factors of lasers with the same structure are found, due to the differences between gain changes that are induced optically or through the electrical bias. The relative contributions of stimulated transitions and free-carrier absorption to the total carrier heating dynamics in SOAs of varying dimensionality are also reported for the first time.
Examining the QD electroluminescence and linear gain spectra in combination with the carrier dynamics also brings about conclusions on the nature of the quantum confinement, dot energy-level structure, and density of states—aspects of the material that have not been previously well understood.
PhD
Advisors/Committee Members: Aitchison, J. Stewart, Smith, Peter W. E., Electrical and Computer Engineering.
Subjects/Keywords: quantum dot; semiconductor optical amplifiers; all-optical switching; semiconductor nonlinear dynamics; semiconductor lasers; nonlinear optics; semiconductor physics; linewidth enhancement factor; two-photon absorption; quantum well; quantum dash; ultrafast lasers; optical signal processing; 0544
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zilkie, A. J. (2008). High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/17265
Chicago Manual of Style (16th Edition):
Zilkie, Aaron John. “High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.” 2008. Doctoral Dissertation, University of Toronto. Accessed March 02, 2021.
http://hdl.handle.net/1807/17265.
MLA Handbook (7th Edition):
Zilkie, Aaron John. “High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures.” 2008. Web. 02 Mar 2021.
Vancouver:
Zilkie AJ. High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. [Internet] [Doctoral dissertation]. University of Toronto; 2008. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1807/17265.
Council of Science Editors:
Zilkie AJ. High-speed Properties of 1.55-micron-wavelength Quantum Dot Semiconductor Amplifiers and Comparison with Higher-Dimensional Structures. [Doctoral Dissertation]. University of Toronto; 2008. Available from: http://hdl.handle.net/1807/17265
20.
Cebrecos Ruiz, Alejandro.
Transmission, reflection and absorption in Sonic and Phononic Crystals
.
Degree: 2015, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/56463
► [EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid…
(more)
▼ [EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid or fluid. By controlling the geometry and the impedance contrast of its constituent materials, one can control the dispersive properties of waves, giving rise to a huge variety of interesting and fundamental phenomena in the context of wave propagation. When a propagating wave encounters a medium with different physical properties it can be transmitted and reflected in lossless media, but also absorbed if dissipation is taken into account. These fundamental phenomena have been classically explained in the context of homogeneous
media, but it has been a
subject of increasing interest in the context of periodic structures in recent years as well. This thesis is devoted to the study of different effects found in sonic and phononic crystals associated with transmission, reflection and
absorption of waves, as well as the development of a technique for the characterization of its dispersive properties, described by the band structure.
We start discussing the control of wave propagation in transmission in conservative systems. Specifically, our interest is to show how sonic crystals can modify the spatial dispersion of propagating waves leading to control the diffractive broadening of sound beams. Making use of the spatial dispersion curves extracted from the analysis of the band structure, we first predict zero and negative diffraction of waves at frequencies close to the band-edge, resulting in collimation and focusing of sound beams in and behind a 3D sonic crystal, and later demonstrate it through experimental measurements. The focusing efficiency of a 3D sonic crystal is limited due to the strong scattering inside the crystal, characteristic of the diffraction regime. To overcome this limitation we consider axisymmetric structures working in the long wavelength regime, as a gradient index lens. In this regime, the scattering is strongly reduced and, in an axisymmetric configuration, the symmetry matching with acoustic sources radiating sound beams increase its efficiency dramatically. Moreover, the homogenization theory can be used to model the structure as an effective medium with effective physical properties, allowing the study of the wave front profile in terms of refraction. We will show the model, design and characterization of an efficient focusing device based on these concepts.
Consider now a periodic structure in which one of the parameters of the lattice, such as the lattice constant or the filling fraction, gradually changes along the propagation direction. Chirped crystals represent this concept and are used here to demonstrate a novel mechanism of sound wave
enhancement based on a phenomenon known as "soft" reflection. The
enhancement is related to a progressive slowing down of the wave as it propagates along the material, which is associated with the group velocity of the local dispersion relation at the planes of the crystal. A model based on the…
Advisors/Committee Members: Picó Vila, Rubén (advisor), Sánchez Morcillo, Víctor José (advisor).
Subjects/Keywords: Periodic Structures;
Sonic Crystals, Phononic Crystals;
Transmission;
Reflection, Absorption;
Band Structure;
Dispersion Relation;
Focusing;
Focalization;
Collimation;
Spatial dispersion;
Beam;
Acoustic Beam;
Ultrasonic Beam;
Axisymmetric;
Symmetry Matching;
Gradient Index;
Lens;
Lenses;
Homogenization;
Refraction;
Refractive devices;
Long-wavelength;
Effective medium;
Effective properties;
Paraxial approximation;
Isofrequency lines;
Isofrequency contours;
Wave vector;
Chirped;
Tappered;
Rainbow trapping;
Mirage effect;
Chirped crystals;
Wave Enhancement;
Soft reflection;
Group velocity;
Slowing down;
Coupled Mode Theory;
CMT;
Linear Chirped;
Exponential chirped;
Dissipation;
Losses;
Porous absorber;
Porous material;
Porous layers;
Dissipative couple mode theory;
Modulation;
Loss modulation;
Band structure calculation;
Elastic waves;
Acoustic waves;
Time-marching;
Algorithm;
Bloch vector;
Bloch boundary conditions;
Boundary conditions;
Unit cell;
Vibrational modes;
Resonant peaks;
Resonant modes;
Accuracy;
Convergence;
Computation time;
Solid-Solid;
Solid-fluid;
Lamella cyrstal;
Extraordinary absorption;
Interaction strength;
Time delay;
Fourier Transform
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cebrecos Ruiz, A. (2015). Transmission, reflection and absorption in Sonic and Phononic Crystals
. (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/56463
Chicago Manual of Style (16th Edition):
Cebrecos Ruiz, Alejandro. “Transmission, reflection and absorption in Sonic and Phononic Crystals
.” 2015. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 02, 2021.
http://hdl.handle.net/10251/56463.
MLA Handbook (7th Edition):
Cebrecos Ruiz, Alejandro. “Transmission, reflection and absorption in Sonic and Phononic Crystals
.” 2015. Web. 02 Mar 2021.
Vancouver:
Cebrecos Ruiz A. Transmission, reflection and absorption in Sonic and Phononic Crystals
. [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10251/56463.
Council of Science Editors:
Cebrecos Ruiz A. Transmission, reflection and absorption in Sonic and Phononic Crystals
. [Doctoral Dissertation]. Universitat Politècnica de València; 2015. Available from: http://hdl.handle.net/10251/56463
. 
Open Access Theses and Dissertations
