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Dissertations / Theses on the topic 'Glass transition temperature'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Berglund, Peter. "The glass transition in high-temperature superconductors." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26388.

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In high-temperature superconductors a large region of the magnetic phase diagram is occupied by a vortex phase. This vortex phase can be divided into two regions. At lower temperatures the vortices are in a truly superconducting solid phase. At higher temperatures the solid changes to a dissipative vortex liquid. The transition between the two phases depends of the disorder in the material. If there is no or low disorder the transition is a first order transition but if there are a lot of disorder the vortex solid is called a vortex glass and the transition is a second order transition. To des

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2

Guan, Qing. "Sodium diffusion in soda-lime-silicate glass around the glass transition temperature /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687115926219.

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3

Zhang, Yuwei. "A study of the measurement of glass transition temperature." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508077.

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4

Hsu, Chuan-liang. "Influence of cooling rate on glass transition temperature and starch retrogradation during low temperature storage /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924889.

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5

Juang, Yi-Je. "Polymer professing and rheological analysis near the glass transition temperature." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1302020366.

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6

Juang, Yi-Je. "Polymer processing and rheological analysis near the glass transition temperature /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486398195327065.

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7

Arab, B., A. Shokuhfar, and S. Ebrahimi-Nejad. "Glass Transition Temperature of Cross-Linked Epoxy Polymers: a Molecular Dynamics Study." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35102.

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Recently, epoxy polymers have been used in different applications and research fields due to their superior properties. In this study, the classical molecular dynamics (MD) was used to simulate formation of the epoxy polymer from cross linking of the EPON 828 with DETA curing agent, and calculate the glass transition temperature (Tg) of the material. A series of MD simulations were independently carried out on the cross-linked epoxy polymer in a range of temperatures from 600 K down to 250 K, and the density of the materials was calculated at the end of each run. Through the linear fit

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8

Singh, Lovejeet. "Effect of Nanoscale Confinement on the Physical Properties of Polymer Thin Films." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4822.

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The behavior of polymeric systems confined into thin films is a situation that has numerous practical consequences. One particular application in which the properties of thin polymer films is becoming crucially important is in the design, formulation, and processing of photoresists for semiconductor microlithography. As devices continue to be scaled down into the nano-regime, the microelectronics industry will ultimately rely upon a molecular understanding of materials for process development. The majority of these devices are now confined in planar geometries; thus, thin films have played

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9

Mlynarczyk, Paul John. "The nature and determination of the dynamic glass transition temperature in polymeric liquids." Kansas State University, 2014. http://hdl.handle.net/2097/17782.

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Master of Science<br>Department of Chemical Engineering<br>Jennifer L. Anthony<br>A polymer has drastically different physical properties above versus below some characteristic temperature. For this reason, the precise identification of this glass transition temperature, T[subscript]g, is critical in evaluating product feasibility for a given application. The objective of this report is to review the behavior of polymers near their T[subscript]g and assess the capability of predicting T[subscript]g using theoretical and empirical models. It was determined that all polymers begin to undergo st

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10

Bouscarrat, David. "Time-dependent damage in woven-ply thermoplastic composites above glass transition temperature Influence of time-dependent phenomena on translaminar fracture of woven-ply C/PPS laminates above the glass transition temperature." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR29.

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Dans les composites associant matrice organique et renfort fibreux, le couplage entre comportements visqueux (viscoélasticité, viscoplasticité) et mécanismes d’endommagement est très peu étudié à l’échelle mésoscopique et se limite principalement à des analyses post-mortem. Pour des applications aéronautiques à haute température (e.g., nacelle de moteur d’avion), la problématique est encore plus complexe. Notamment au sein de stratifiés à matrice thermoplastique haute performance PPS renforcés par des tissus de fibres de carbone. Ces matériaux sont caractérisés par des zones riches en matrice

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11

Espinosa, Arronte Beatriz. "Resistivity and the solid-to-liquid transition in high-temperature superconductors." Doctoral thesis, KTH, Microelectronics and Applied Physics, MAP, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4251.

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<p>In high-temperature superconductors a large region of the magnetic phase diagram is occupied by a vortex phase that displays a number of exciting phenomena. At low temperatures, vortices form a truly superconducting solid phase which at high temperatures turns into a dissipative vortex liquid. The character of the transition between these two phases depends on the amount and type of disorder present in the system. For weak point disorder the vortex solid-to-liquid transition is a first-order melting. In the presence of strong point disorder the solid is thought to be a vortex-glass and the

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12

Chandrasekaran, Gurucharan. "Material Characterization and Modeling of Strain Induced Crystallization in PET above the Glass Transition Temperature." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218053145.

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13

Lu, Xiaolin. "The study of polymers in geometrically confined states by the thermal analysis, the spectroscopic study, and the morphological investigation /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CENG%202004%20LU.

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14

Le, Baut Nicolas. "Physical and adhesive properties of some materials made by "click" chemistry." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060712.161329/index.html.

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15

Gao, Yongxiang. "Direct observation of correlated motions in colloidal gels and glasses." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115677.

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Dynamical heterogeneity (DH) has been observed in many systems approaching the glass or jamming transition. Whether DH has a structural origin is under heated debate. To provide a deeper understanding, in this thesis I investigate the microscopic dynamics in weakly attractive colloidal systems by confocal fluorescence microscopy. The van Hove density-density correlation function is applied to our systems. Separable fast and slow populations emerge in the self part (svH), while the distinct part shows a strong signature of DH close to the gel transition. At intermediate time, svH shows a purely

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16

Dupaix, Rebecca B. (Rebecca Brown) 1976. "Temperature and rate dependent finite strain behavior of poly(ethylene terephthalate) and poly(ethylene terephthalate)-glycol above the glass transition temperature." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/7972.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.<br>Includes bibliographical references (p. 333-348).<br>Poly(ethylene terephthalate) is widely used for consumer products such as drawn fibers, stretched films, and soda bottles. Much of its commercial success lies in the fact that it crystallizes at large strains during warm deformation processing. The imparted crystallinity increases its stiffness and strength, improves its dimensional stability, and increases its density. The crystallization process and the stress-strain behavior above the glass t

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17

Liu, Dehua. "Thermodynamic and glass transition behavior in CO₂-Polymer systems emphasizing the surface region." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1149020480.

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18

Sarmadi, Abdolmajid. "Effect of heat treatment on dyeability, glass transition temperature, and tensile properties of polyacrylonitrile fibers (orlon 42)." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49836.

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Deniers of treated and untreated fibers were determined and the „ results were used in calculations of tenacity and initial modulus. Tensile properties were measured on a constant—rate—of—extension machine. Shrinkage of treated and untreated fibers were measured after they were boiled in water for 15 min. The glass transition temperatures (Tg) were obtained by differential scanning calorimetry. The ratio of the intensities of the CN/CH stretching bands were found by infrared spectroscopy, using the KBr method<br>Ph. D.<br>incomplete_metadata

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19

Vogtmann, Dana E. "Stress relaxation in poly(methyl methacrylate) (PMMA) during large-strain compression testing near the glass transition temperature." Connect to resource, 2009. http://hdl.handle.net/1811/36980.

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20

Truong, Vinh. "Modelling of the glass transition temperature of sugar-rich foods and its relation to spray drying of such products /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17253.pdf.

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21

Chen, Kai. "Thermal behavior of model polystyrene materials exploring nanoconfinement effect /." Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2009r/chen.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2007.<br>Title from PDF title page (viewed Jan. 28, 2010). Additional advisors: Derrick R. Dean, Wiliam K. Nonidez, Andrei Stanishevsky, Charles L. Watkins. Includes bibliographical references.

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22

Black, Victoria J. "High temperature supercapacitors." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12490.

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The scientific objective of this research program was to determine the feasibility of manufacturing an ionic liquid-based supercapacitor that could operate at temperatures up to 220 °C. A secondary objective was to determine the compatibility of ionic liquids with other cell components (e.g. current collectors) at high temperature and, if required, consider means of mitigating any problems. The industrial motivation for the present work was to develop a supercapacitor capable of working in the harsh environment of deep offshore boreholes. If successful, this technology would allow down-hole te

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23

Nieves, Ian Ivan. "Effects of Electron Irradiation and Percent Composition on the Glass Transition Temperature and Damping of Boron-Epoxy Composites." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539626045.

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24

Alvarez, Donado René Alberto 1989. "Estudo de propriedades dinâmicas e termodinâmicas de líquidos formadores de vidros metálicos através de simulações computacionais." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/305733.

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Orientador: Alex Antonelli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-30T22:57:05Z (GMT). No. of bitstreams: 1 AlvarezDonado_ReneAlberto_M.pdf: 4171490 bytes, checksum: e9cef25e59956ed4e6201f408c88c61c (MD5) Previous issue date: 2016<br>Resumo: Através de simulações de dinâmica molecular (MD) estudou-se o comportamento da viscosidade como função da temperatura para a liga Cu46Zr47Al7 que apresenta uma transição dinâmica frágil - forte. A interação entre as partículas foi modelada pelo potencial Modif

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25

Duki, Solomon Fekade. "Topics in Hard and Soft Condensed Matter Physics." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1232737384.

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26

Wen, Chengyuan. "Computational Studies of Polyetherimides: Beyond All-Atom Molecular Dynamics Simulations." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/104205.

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Polyetherimides are an important class of engineering thermoplastics used in a broad range of industries and applications because of their high heat resistance and stability, high strength and moduli, excellent electrical properties over a wide range of temperatures and frequencies, good processability, good adhesive properties, and chemical stability. All-atom molecular dynamics (MD) simulation is a useful tool to study polymers, but the accessible length and time scales are limited. In this thesis, we explore several computational methods that go beyond all-atom MD simulations to investigate

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27

Pedoto, Giuseppe. "Characterization and Modelling of the Thermomechanical and Ageing Behavior of PEKK and C/PEKK Composites for Aircraft Applications at High Temperatures (above the Glass Transition Temperature) Characterization of the mechanical behavior of PEKK polymer and C/PEKK composite materials for aeronautical applications below and above the glass transition temperature." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0011.

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La sensibilisation accrue aux questions environnementales concerne aujourd'hui les structures aéronautiques en termes d'impact environnemental et traitements de fin de vie. Dans cette optique,la possibilité de remplacer, dans les composites à matrice organique (CMO) utilisés pour des applications aéronautiques, leur matrice thermodurcissable non recyclable par une matrice thermoplastique recyclable est étudiée. En outre, les polymères thermoplastiques, tels que le PEKK, ont la possibilité d'être utilisés dans des structures plus chaudes (par exemple le pylône d'un avion), faisant l'objet de so

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28

Gauthier, Mario. "The effects of matrix glass transition temperature and polarity, and ionic group spacers on ion aggregation in styrene ionomers /." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75935.

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Matrix glass transition temperature depression through internal plasticization of a styrene-sodium methacrylate ionomer resulted in enhanced clustering at low plasticization levels (up to ca. 20 mole%). At higher plasticization levels, ion aggregation was strongly disrupted. Matrix polarity effects were studied by nitrating the styrene units of the same ionomer. A sample with a relaxed dielectric constant comparable to acrylate polymers showed no decrease in clustering. Similarly, plasticization with nitrobenzene resulted in typical nonpolar diluent behavior. Polarity was, therefore, not a sig

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29

La, Fuente Arias Carla Ivonne. "Efeito da etapa de resfriamento sobre as caracterísitcas de crocância e cor na obtenção de banana nanica crocante por secagem com pulso a alta temperatura." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256032.

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Orientador: Celso Costa Lopes<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-18T08:10:10Z (GMT). No. of bitstreams: 1 LaFuenteArias_CarlaIvonne_M.pdf: 1773876 bytes, checksum: 0229ec1ebad94e8b4ebb343f440c2fd6 (MD5) Previous issue date: 2011<br>Resumo: Neste trabalho estudou-se a secagem de banana Nanica empregando um pulso inicial a alta temperatura e curto tempo (150°C e 15 minutos), seguido de uma etapa de resfriamento e uma etapa de secagem convencional a ar quente a 70°C. Na primeira parte do trab

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30

Xu, Shengyi. "Computational insight into kinetic control of star polymer structure and properties." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1499466088519005.

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31

Sills, Scott E. "Interfacial nanorheology : probing molecular mobility in mesoscopic polymeric systems /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/9832.

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32

Persson, Magnus. "Thermo-Oxidative Degradation of High Temperature Polyimide Composites : Characterization and Modeling of Composites Affected by an Extreme Environment." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60494.

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Carbon fiber (CF) 8-harness satin weave, T650/Neximid system of [(+45/-45)/(0/90)]2S and [(0/90)]4S layup was manufactured using resin transfer molding (RTM). The material was cut into 3-point bending specimens and treated for 24 hours in a burn oven at T=(320,350,375,400,450 & 500)°C. The material was tested according to ASTM E1640-13 using dynamic mechanical thermal analysis (DMTA). Un-treated material showed Tg levels of 384°C and 392°C for the respective layups. It was found that pre-Tg treatment between 320-375°C affected this material parameter up to similar levels as previous studie

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33

Mapesa, Emmanuel Urandu. "Molecular dynamics of nanometric layers of glass formers in interaction with solid substrates." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-155709.

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Broadband Dielectric Spectroscopy (BDS) in combination with a nanostructured electrode arrangement – which circumvents the conventional need to evaporate metal electrodes onto soft matter – is used to study the molecular dynamics of several glass forming materials confined in nanometric (> 5 nm) layers. Other complementary experimental tools employed in this work include spectroscopic vis-Ellipsometry (SE), AC-chip calorimetry (ACC), X-ray reflectrometry (XRR), Differential Scanning Calorimetry (DSC) and Atomic Force Microscopy (AFM). The latter is used to characterize the topography of the sa

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34

Wheeler, Megan Caroline. "Parameters Influencing the Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9687.

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This study is an evaluation of epoxy coated reinforcing steel (ECR) and its ability to effectively provide corrosion protection in reinforced concrete highway bridge decks. An analysis was conducted on 10 bridge decks built in the state of Virginia between the years 1981 and 1995. A total of 141 cores containing either ECR or bare steel were evaluated. A chloride solution was applied to the surface on a weekly cycle (for a total duration of 3.06 years) and a nondestructive electrochemical testing was performed on each core on a monthly cycle. Cores were also inspected for surface cracks, the

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35

Takeiti, Cristina Yoshie. "Estudo da influencia da transição vitrea sobre a instantaneização de maltodextrinas por processo de aglomeração umida." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256350.

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Orientadores: Fernanda Paula Collares, Theo Guenter Kieckbusch<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-08T12:08:34Z (GMT). No. of bitstreams: 1 Takeiti_CristinaYoshie_D.pdf: 20201216 bytes, checksum: c1aa9903ccb493780afa2e5957c1db81 (MD5) Previous issue date: 2007<br>Resumo: Maltodextrinas são oligossacarídeos solúveis em água, provenientes da hidrólise de amidos. As condições da hidrólise permitem definir a distribuição de massa molecular das maltodextrinas e, conseqüentemente, suas características

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36

Beena, Unni Aparna. "Structuration and glass transition temperature of the adsorbed polymer layer : some insights in the property deviations of the ultra-thin polymer film." Thesis, Lorient, 2016. http://www.theses.fr/2016LORIS416/document.

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La miniaturisation est un paramètre important lors de la fabrication d’un dispositif. Les films minces de polymère, qui sont des composants essentiels de beaucoup d’entre eux, montrent des propriétés anormales quand leur épaisseur est réduite jusqu’à produire un film confiné. Ce travail est dédié à la compréhension des effets de confinements et des propriétés des films ultra-minces de polymère. Dans un premier temps, nous avons observé l’évolution de la densité des films de polymère en fonction de leur épaisseur au moyen de nanoparticules d’oxyde de cérium adsorbées sur les surfaces polymères.

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37

Liu, Yanchun. "Synthesis and Characterization of Amorphous Cycloaliphatic Copolyesters with Novel Structures and Architectures." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77999.

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A series of random and amorphous copolyesters containing different cycloaliphatic rings within the polymer chains were prepared by melt polycondensaton of difunctional monomers (diesters and diols) in the presence of a catalyst. These polyesters were characterized by nuclear magnetic resonance (NMR), size exclusion chromatography (SEC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensile tests and/or dynamic mechanical analysis (DMA). The copolyester based on dimethyl bicyclo[2.2.2]octane-1,4-dicarboxylate (DMCD-2) was observed to have a higher Tg, about 115ºC,

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38

Qadir, Adnan. "Investigation Of Low Temperature Cracking In Asphalt Concrete Pavement." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612696/index.pdf.

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In this study, low temperature cracking of asphalt concrete is investigated based on a laboratory experimental program including the design variables of aggregate type, gradation, asphalt content, binder grading, binder modification, and the experimental variables of cooling rate, and specimen size. The design of experiment is proposed according to the fractional factorial design principles to reduce the required number of test specimens. Mix designs are performed according to the Superpave mix design guidelines using materials obtained from the Turkish General Directorate of High-ways. In th

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39

Henann, David Lee. "A constitutive theory for the mechanical response of amorphous metals at high temperatures spanning the glass transition temperature : application to microscale thermoplastic forming of Zr₄₁.₂Ti₁₃.₈Cu₁₂.₅Ni₁₀Be₂₂.₅." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44885.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.<br>Includes bibliographical references.<br>Bulk metallic glasses (BMGs) are a promising emerging engineering material distinguished by their unique mechanical properties and amorphous microstructure. In recent years, an extremely promising microscale processing method for bulk metallic glasses, called thermoplasticforming has emerged. As with any emerging technology, the scientific basis for this process is at present fragmented and limited. As a result their is no generally agreed upon theory to model

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40

Moghaddas, Mohamad Amin. "Comparison of Computational Modeling of Precision Glass Molding of Infrared Lenses." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397599181.

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41

Mitton, Renata. "Tuning the Physical Properties of Poly(arylene ether)s Prepared from 3,5-Difluorobenzene Sulfonamides." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1436957462.

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42

Zhang, Lizhong. "Physical, mechanical, thermal, and viscoelastic properties of water-blown rigid polyurethane foam containing soy flours /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924871.

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43

Hofsetz, Kelly 1976. "Propriedades fisicas e transições de fase da banana nanica submetida a secagem com pulso HTST (inicial)." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256033.

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Orientador: Celso Costa Lopes<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-09T15:17:24Z (GMT). No. of bitstreams: 1 Hofsetz_Kelly_D.pdf: 10880310 bytes, checksum: a6cd1fb5002b3963054fc23a04552ed4 (MD5) Previous issue date: 2007<br>Resumo: Neste trabalho estudou-se a secagem de banana utilizando um pulso inicial a alta temperatura e curto tempo, combinado com uma etapa de secagem convencional a ar quente a 70°C. Numa primeira etapa, foram analisadas as mudanças de encolhimento, porosidade e estrutura ao lo

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44

Piovesan, Victor. "Relations composition – structure – propriétés des verres peralumineux pour le conditionnement des déchets nucléaires." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2064/document.

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Dans le cadre de la recherche sur le conditionnement des déchets nucléaires issus des combustibles usés, de nouvelles formulations vitreuses sont à l’étude. Ces nouvelles matrices doivent être capables d’incorporer une importante teneur en produits de fission et actinides mineurs (PFA) tout en présentant d’excellentes propriétés en termes d’homogénéité, stabilité thermique, comportement à long terme et faisabilité technologique. Cette étude s’intéresse aux verres dits « peralumineux », c’est-à-dire à des verres présentant un excès d’ions aluminium vis-à-vis des ions compensateurs de charges (N

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45

Ellgren, Alex. "Analysis of vortex movement in an YBCO thin film : Models of the vortex solid-to-liquid transition compared to a sensitive resistive measurement of a strongly pinned YBCO thin film." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140589.

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When a high-temperature superconductor transitions in the presence of a magnetic field, the resistance does not immediately go to zero. Instead, the transition is smoothed by the resistive effects of moving vortices so that perfect conductivity isn't reached until several K below Tc, where the vortices have frozen into a glass state. The properties of this glass depend mainly on the amount and correlation between impurities in the superconductor. This report describes a study of the glass transition in an YBCO thin film rich in uncorrelated impurities. The aim was to use sensitive resistive me

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Edling, Hans Eliot. "Synthesis and Structure-Property Relationships of Polyesters Containing Rigid Aromatic Structures." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/95029.

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Polyesters are an attractive class of polymer that can be readily modified with a wide range of different comonomers, during polymerization or with melt blending, to achieve a wide variety of physical properties. This research primarily focuses on polyesters that incorporate rigid aromatic structures that have excellent potential to enhance thermal and mechanical properties. Copolyesters were prepared through melt polycondensation of diesters and diols in the presence of an exchange catalyst. Monomer incorporation was verified with nuclear magnetic resonance (NMR) and molecular weights were ob

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Budhavaram, Naresh Kumar. "Facile protein and amino acid substitution reactions and their characterization using thermal, mechanical and optical techniques." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/40340.

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The work focused on addressing four main objectives. The first objective was to quantify protein and amino acid substitution reactions. Michael addition reactions were used to modify the amino acids and protein. Amino acids alanine, cysteine, and lysine, and protein ovalbumin (OA) were substituted with different concentrations of ethyl vinyl sulfone (EVS). The substituted products were analyzed using Raman spectroscopy and UV-spectroscopy based ninhydrin assay. In case of alanine, Raman and UV results correlated with each other. With cysteine at lower EVS substitutions amine on the main chain

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Andrejevic, Marina. "Functionalized Sulfone and Sulfonamide Based Poly(arylene ether)s." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1402073837.

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Sánchez, Sáenz Carolina Maria 1978. "Secagem contínua de raízes de chicória com aplicação de radiação infravermelha em um secador agitador/misturador." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257102.

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Orientadores: Rafael Augustus de Oliveira, Kil Jin Park<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola<br>Made available in DSpace on 2018-08-25T10:54:18Z (GMT). No. of bitstreams: 1 SanchezSaenz_CarolinaMaria_D.pdf: 5939209 bytes, checksum: 43efccade58fb536d9e9c45782a43cc3 (MD5) Previous issue date: 2014<br>Resumo: As pesquisas atuais em secagem de alimentos levam em consideração a qualidade do produto e a eficiência energética do processo, já que este processo consome cerca de 20-25% da energia utilizada pelo processamento na indústria de alimento

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Osborn, Shawn James. "Morphological and Mechanical Properties of Dispersion-Cast and Extruded Nafion Membranes Subjected to Thermal and Chemical Treatments." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37517.

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The focus of this research project was to investigate morphological and mechanical properties of both extruded and dispersion-cast NafionÂ® membranes. The project can be divided into three primary objectives; obtaining a fundamental understanding of the glass transition temperature of NafionÂ®, determining the effect of thermal annealing treatments on the morphology and mechanical properties of dispersion-cast NafionÂ®, and examination of dispersion-cast NafionÂ® subjected to an ex-situ, Fentonâ s chemical degradation test. NafionÂ®, a perfluorosulfonate ionomer, is considered a commerciall

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