Дисертації з теми "Expansion phase"
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Harmon, Connor. "Tucson Streetcar Phase Two Expansion." The University of Arizona, 2016. http://hdl.handle.net/10150/608579.
In a society growing towards alternative modes of transportation, this study explores the phase 2 streetcar expansion for the Tucson area. Using case studies and research articles, a criteria of factors were created to best judge three predetermined expansion routes. A case study was then done on these routes to determine which route would be best for the area. In this study, the factors that were looked at and used to rank the three routes included; population density and average annual income of the surrounding area of the route (400 meter buffer), accessibility and connectivity, which includes; bus stops, bike lanes, walkability, traffic counts and possible park & ride development. The last factor used in the case study was proximity to destination, specifically how many ‘big destinations’ (destinations that experience high volumes of people) each route had. The proximity to destination factor also determined how good of a balance each route had with housing, work and amenities/leisure destinations.
Winder, Daniel. "Investigating phase transitions using the linear delta expansion." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246678.
Hwang, Moonkyu. "Numerical modeling of the expansion phase of vapor explosions." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/16761.
Abou-Koura, G. H. "Studies of the expansion phase of a laser plasma." Thesis, Swansea University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635840.
Yusoff, Nazrul Hizam. "Stratifying of liquid-liquid two phase flows through sudden expansion." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12939/.
Zhang, Yan. "Weakly first-order phase transitions : [epsilon] expansion vs. numerical simulation /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9715.
Gagliardi, Giuseppe [Verfasser]. "The QCD Phase Diagram from Strong Coupling Expansion / Giuseppe Gagliardi." Bielefeld : Universitätsbibliothek Bielefeld, 2020. http://d-nb.info/1211474089/34.
Kanu, Elizabeth. "Expansion driven Unstable Two Phase Flows in Long Risers and Wells." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14420.
Gutierrez, Emmanuel David Mercado. "Thermal expansion coefficient for a trapped Bose gas during phase transition." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-27102016-102903/.
Amostras atômicas ultrafrias de um gás de Bose são convenientes para estudar questões fundamentais da física moderna, como as transições de fase e fenômenos críticos em condensados de Bose-Einstein (BEC). A minha dissertação dedica se à investigação das susceptibilidades termodinâmicas como a compressibilidade isotérmica e o coeficiente de expansão térmica de a traves da transição de um BEC de 87Rb. Os fenômenos críticos e os exponentes críticos a traves da transição podem explicar o comportamento da compressibilidade isotérmica e do coeficiente de expansão térmica perto da temperatura crítica TC. Ao empregar o desenvolvido formalismo das variáveis termodinâmicas globais, levamos a cabo o tratamento estatístico de um gás de Bose num potencial harmônico 3D. Depois da comparação dos resultados obtidos, revelam as mais apropriadas variáveis de estado descrevendo o sistema, chamadas parâmetro de volume e pressão, V e Π respectivamente. As duas estão relacionadas com as frequências de confinamento e a distribuição de densidade do BEC. Nós aplicamos esta abordagem para definir um conjunto de novas variáveis termodinâmicas do BEC, e também para construir o diagrama de fase isobárico V T. O anterior nós permite extrair a compressibilidade κT e o coeficiente de expansão termina βΠ. O comportamento da compressibilidade isotérmica corresponde a uma transição de fase de segunda ordem enquanto que o coeficiente de expansão térmica ao redor do ponto crítico comporta se como β ∼ tr-α, onde tr é a temperatura reduzida do sistema, e α o exponente crítico. Deste resultado nós obtemos um exponente critico, α = 0.15 ± 0.09, que permite determinar a dimensionalidade do sistema a traves da teoria de escala, relacionando os exponentes críticos com a dimensionalidade. Como resultado, encontramos que a dimensionalidade do sistema é d ∼ 3 que está de acordo como a dimensão real do sistema.
Dolgusheva, E. B., and V. Yu Trubitsin. "Lattice Parameters and Thermal Expansion of Zirconium Thin Films." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35222.
Pan, Ruijun. "Energy density and volume expansion in solid-liquid phase change, for energy applications." Thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128949.
Rose, Kyle. "Synthesis, Phase Development, and the Mechanism for Negative Thermal Expansion in Aluminum Tungstate." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703275/.
Pueschel, Charles A. "First principles approach to understanding stability and phase transitions of metal A(II)B(IV)hexafluorides." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54484.
Brown, Wayne. "Characterisation of low energy ions observed near and during the substorm expansion phase onset." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302621.
Joshi, Darshan Gajanan. "Magnetic quantum phase transitions: 1/d expansion, bond-operator theory, and coupled-dimer magnets." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-198634.
Shaw, Leah Belinda. "Monte Carlo and Series Expansion Studies of the Anisotropic Driven Ising Lattice Gas Phase Diagram." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31851.
The Ising lattice gas displays a number of surprising phenomena when driven into nonequilibrium steady states. This study extends previous work to a more general model with anisotropic interparticle interactions. Using Monte Carlo simulations, we obtain the phase diagram for the model, controlled by the driving field, temperature, and anisotropy parameter a. Under saturation drive, the shift in the transition temperature between ordered and disordered states can be either positive or negative, depending on a. The possible existence at large a of an additional phase ordered in only one direction is discussed. For finite drives, both first and second order transitions are observed. A novel technique for locating the first order transition line is presented.
Some aspects of the phase diagram can be predicted by investigating the
two-point correlation function to first order in a high temperature series
expansion. However, the series expansion fails to predict even
qualitatively the a-dependence of the critical temperature.
Master of Science
Liu, Zhi. "Transition Metal Nitrides and Their Solid Solutions: A First-Principles Approach with Cluster Expansion Computational Predictive Models." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1492525178190092.
Youssef, Walid Mohamed Khalil Abdalla. "Experimental and computational study of indirect expansion solar assisted heat pump system with latent heat storage for domestic hot water production." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15263.
Hartig, Maximilian [Verfasser], and T. [Akademischer Betreuer] Schulenberg. "Numerical Simulation of Fluid-Structure Interaction during the Expansion Phase in Sodium Cooled Fast Reactors / Maximilian Hartig ; Betreuer: T. Schulenberg." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/120047130X/34.
Cronin, Joseph M. "Exploring Capabilities of Electrical Capacitance Tomography Sensor & Velocity Analysis of Two-Phase R-134a Flow Through a Sudden Expansion." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1495541577975687.
Quinteros, Milton I. "Trellis Coded Modulation Schemes Using A New Expanded 16-Dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying Constellation." ScholarWorks@UNO, 2009. http://scholarworks.uno.edu/td/924.
Berg, Adrianus J. J. van den [Verfasser], and Heinrich [Akademischer Betreuer] Leonhardt. "Influence of cell-cycle phase in hematopoietic stem cell lineage production and expansion / Adrianus J. J. van den Berg ; Betreuer: Heinrich Leonhardt." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1120923603/34.
Baptista, Gualter Barbas. "Bridging environmental conflicts with social metabolism : forestry expansion and socioeconomic change." Doctoral thesis, FCT - UNL, 2010. http://hdl.handle.net/10362/5891.
Environmental conflicts have traditionally been approached from several scientific fields. However, the different theoretical and empirical developments have proceeded in parallel, with often competing descriptive languages. Furthermore, they tend to focus on resolution, while neglecting the role of conflicts as an expression of groups facing social and ecological injustices perpetrated by the hegemony. This research attempted to build a politically useful understanding of why and how environmental conflicts appear, through interdisciplinary bridging and the avoidance of the post-political hegemony. By focusing on an ex-post historical analysis of the conflicts against eucalyptus plantations in Portugal in the late 1980s, it attempted to identify patterns and dynamics that relate to conflicts. Theories were anchored along the concepts of social metabolism and, more particularly, the framework of multiple scale integrated assessment of societal and ecological metabolism (MuSIASEM). An adaptation of MuSIASEM for conflict analysis was iteratively developed with the empirical analysis of the political ecology of the case study. During the pre-analytical phase, an open information space is developed, comprising environmental conflicts literature, as well as the environmental history and institutional analysis of the case study. The information space is subjected to successive compressions before reaching a relevant structure of the problem. A storyteller is defined according to the relative power imbalances of the conflict situation. Theoretical pathways are created to serve as auxiliaries for the formalization process and for structuring the analysis. The analysis process navigates through the formalizations within each theoretical pathway. Impredicative loop analysis (ILA) is used to expose tensions and constraints generated by emerging hypercycles or clashing metabolic profiles. Finally, the results are subjected to a dialectical discussion, allowing the communication between different pathways. Dialectical discussion along the pathways is particularly useful for promoting interdisciplinary dialogue. The political ecology analysis of the case study has revealed that the higher intensity of conflicts in the late 1980s was due to a series of factors. The immediate cause was resource xii scarcity, which led to a speculative race for lands that included land grabbing strategies. The growing environmental movement in Portugal has provided the rural and peasant identities (the storytellers), with new languages that empowered their struggles. Institutional changes contributed to conflicts attenuation in the 1990s. However, a growing global consumption of paper continues to push the frontiers of industrial forestry around the world. Latin America and Eastern Europe have increased their peripheral position in the world-system of the paper industry, as suppliers of cheap pulp and land for fast-growth tree plantations. Packaging, as a main end-use of paper, can be used to hide from the consumer the impacts of production. This end-use of paper might intensify unequal ecological exchange in different areas and commodities, while being reinforced by it. In this context, conflicts might lead to a relocation of impacts, leaving the hegemony untouched.
Nilsson, Linnéa, Peter Enhörning, and Christoffer Lindgren. "Thoughts and reasoning in family businesses : Founders thoughts and reasoning behind decisionsduring the expansion phase in a first generation family business with few owners." Thesis, Linnéuniversitetet, Ekonomihögskolan, ELNU, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-20364.
Perchet, Guillaume. "Analyse des erreurs de phase introduites par l'électronique de réception d'un télémètre laser par déphasage : expansion du déphasage permettant la mesure à haute résolution." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT074H.
Yamada, Ryo. "Application of Steepest-Entropy-Ascent Quantum Thermodynamics to Solid-State Phenomena." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/85866.
Ph. D.
Many engineering materials have physical and chemical properties that change with time. The tendency of materials to change is quantified by the field of thermodynamics. The first and second laws of thermodynamics establish conditions under which a material has no tendency to change; these conditions are called equilibrium states. When a material is not in an equilibrium state, it is able to change spontaneously. Classical thermodynamics reliably identifies whether a material is susceptible to change, but it is incapable of predicting how change will take place or how fast it will occur. These are kinetic questions that fall outside the purview of thermodynamics. A relatively new theoretical treatment developed by Hatsopoulos, Gyftopoulos, Beretta and others over the past forty years extends classical thermodynamics into the kinetic realm. This framework, called steepest-entropy-ascent quantum thermodynamics (SEAQT), combines the tools of thermodynamics with quantum mechanics through a postulated equation of motion. Solving the equation of motion provides a kinetic description of the path a material will take as it changes from a non-equilibrium state to stable equilibrium. To date, the SEAQT framework has been applied primarily to systems of gases. In this dissertation, solid-state models are employed to extend the SEAQT approach to solid materials. The SEAQT framework is used to predict the thermal expansion of silver, the magnetization of iron, and the kinetics of atomic clustering and ordering in binary solid-solutions as a function of time or temperature. The model makes it possible to predict a unique kinetic path from any arbitrary, non-equilibrium, initial state to a stable equilibrium state. In each application, the approach is tested against experimental data. In addition to reproducing the qualitative kinetic trends in the cases considered, the SEAQT framework shows promise for modeling the behavior of materials far from equilibrium.
Joshi, Darshan Gajanan [Verfasser], Matthias [Akademischer Betreuer] Vojta, and Fabian [Akademischer Betreuer] Essler. "Magnetic quantum phase transitions: 1/d expansion, bond-operator theory, and coupled-dimer magnets / Darshan Gajanan Joshi. Betreuer: Matthias Vojta. Gutachter: Matthias Vojta ; Fabian Essler." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://d-nb.info/1088185932/34.
Joshi, Darshan Gajanan [Verfasser], Matthias [Akademischer Betreuer] Vojta, and Fabian H. L. [Akademischer Betreuer] Essler. "Magnetic quantum phase transitions: 1/d expansion, bond-operator theory, and coupled-dimer magnets / Darshan Gajanan Joshi. Betreuer: Matthias Vojta. Gutachter: Matthias Vojta ; Fabian Essler." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-198634.
Roman, Abdeel J. "Studies of Horizontal Two-Phase Flow Using Electrical Capacitance Tomography and R-134a." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1510840347116138.
Davis, Andrew Scott. "Temperature Induced Deflection of Yttria Stabilized Zirconia Membranes." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338369600.
Agarwal, Akhil. "Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14129.
Chalfi, Toufik Yacine. "Pressure loss associated with flow area change in micro-channels." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24725.
He, Mi. "Caractérisation du comportement à rupture des alliages de zirconium de la gaine du crayon combustible des centrales nucléaires dans la phase post-trempe d'un APRP (Accident de Perte de Réfrigérant Primaire)." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00819279.
Guo, Longkai. "Numerical investigation of Taylor bubble and development of phase change model." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI095.
The motion of a nitrogen Taylor bubble in glycerol-water mixed solutions rising through different types of expansions and contractions is investigated by a numerical approach. The CFD procedure is based on an open-source solver Basilisk, which adopts the volume-of-fluid (VOF) method to capture the gas-liquid interface. The results of sudden expansions/contractions are compared with experimental results. The results show that the simulations are in good agreement with experiments. The bubble velocity increases in sudden expansions and decreases in sudden contractions. The bubble break-up pattern is observed in sudden expansions with large expansion ratios, and a bubble blocking pattern is found in sudden contractions with small contraction ratios. In addition, the wall shear stress, the liquid film thickness, and pressure in the simulations are studied to understand the hydrodynamics of the Taylor bubble rising through expansions/contractions. The transient process of the Taylor bubble passing through sudden expansion/contraction is further analyzed for three different singularities: gradual, parabolic convex and parabolic concave. A unique feature in parabolic concave contraction is that the Taylor bubble passes through the contraction even for small contraction ratios. Moreover, a phase change model is developed in the Basilisk solver. In order to use the existed geometric VOF method in Basilisk, a general two-step geometric VOF method is implemented. Mass flux is calculated not in the interfacial cells but transferred to the neighboring cells around the interface. The saturated temperature boundary condition is imposed at the interface by a ghost cell method. The phase change model is validated by droplet evaporation with a constant mass transfer rate, the one-dimensional Stefan problem, the sucking interface problem, and a planar film boiling case. The results show good agreement with analytical solutions or correlations
Aulbach, Maximilian Wolfgang [Verfasser]. "Magnetic order and magnetic phase transitions in triangular or depleted periodic Anderson lattices: Studies within the framework of dynamical mean-field theory powered by hybridization expansion continuous-time quantum Monte Carlo / Maximilian Wolfgang Aulbach." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2021. http://d-nb.info/1236695046/34.
Young, Lindsay Kay. "Synthesis and Characterization of A2Mo3O12 Materials." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431517117.
Latham, Tina Joy. "Structure and properties of MTiOXOâ†4 crystals." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364604.
Belmkaddem, Kawtar. "Contrôle du rayonnement des antennes miniatures." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT031.
In the current context where the evolution of communicating objects is important indifferent growing fields such as: localization, wireless multimedia systems, etc., controlling theradiation pattern of antennas is one of the most important issues for future radio communicationsystems. In recent years, despite the growth experienced in the areas of antennas, the issue of smallantennas radiation control knows several barriers preventing their deployment. This thesis focuses onthe analysis of the problem of controlling the radiation pattern of small antennas and aims to raisesome questions about a little-explored subject of study. This work gives an approach using differenttechniques to develop new concepts of controlling the radiation pattern of antennas
Mouly, Aude. "Modélisation de la formation et de la détente rapide d'une bulle polyphasique pour l'évaluation des conséquences d'un accident grave de RNR_Na." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0362.
A new generation of nuclear reactor is nowadays developed in order to take into account the economic, environmental and societal stakes of the 21th century. Among the different concepts taking part of the fourth generation, the sodium fast reactors (SFR) are studied in this PhD thesis. These reactors are the only ones of the fourth generation already having a considerable operating feedback in France.To achieve the safety objective of this new generation, the safety approach has to be adapted as soon as the reactor preconceptual and conceptual phases in order to integrate severe accidents, identify and define limitation ways as well as their consequences. This work, dedicated to the study and to the modelling of the expansion phase of a severe accident in SFR, is positioned in the CEA's work dynamic by contributing to the development of the safety approach. The goal of this PhD is to create a tool modelling the important physical phenomena induced by a power excursion in a molten material pool. This involves the formation of a vaporized sodium and molten material bubble and its subsequent expansion.After conducting detailed state of art of the different phenomena involved in the expansion phase, dimensional analysis of the physical processes is performed in order to identify the important ones. Based on this analysis, a model is developed and integrated into a tool, aiming at determining and prioritising the total phenomenon contributions to mechanical loadings on SFR vessel depending on the studied severe accident scenario. A validation step of the tool is then realised in two parts; Separate effect tests and global tests, using experimental results and calculation results obtained with other validated tools. Finally, preconceptual parametrical studies are performed to quantify the results variability due to modelling, scenarios and physical data uncertainties
Bouzar, Khalida. "Approche thermodynamique de l'organisation moléculaire de la phase liquide du toluène sous pression : détermination des expansivités et compressibilités sivities." Paris 6, 1986. http://www.theses.fr/1986PA066312.
Yang, Limin. "Liquid-liquid two-phase flows at T-junctions and through expansions." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404047.
Sloan, Jennifer Marina. "Controlling leaf growth by phased induction of expansin." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522368.
Gana, Inès. "Caractérisation physique et chimique des substances à activité thérapeutique : application aux études de profil de stabilité et de préformulation." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB164/document.
The development of a drug for a given therapeutic target requires several steps, which can be summarized by drug screening, a preclinical phase and a number of clinical phases. These steps allow the selection of an active substance and a verification of its therapeutic efficacy and toxicological safety. The latter two criteria define the quality of the drug, which once demonstrated, must be guaranteed throughout its shelf life. Quality is assessed through stability studies that are carried out with the raw material of the active substance (preformulation phase) and with the final product. The intrinsic stability of the active substance depends on its chemical and physical properties and their characterization is the core of the stability studies, which in addition consists of sensitivity studies of the active pharmaceutical ingredient (API) for environmental factors that can modify the intrinsic properties of the substance. The approach presented in this work is based on the one hand on the assessment of the chemical stability, i.e. the reactivity of APIs through chemical purity studies and forced degradation in solution, and on the other hand on the assessment of the physical stability. For the latter, crystalline polymorphism is of great importance, as is the ability of the API to form hydrates or solvates. The study of crystalline polymorphism is based on the construction of pressure-temperature phase diagrams in accordance with thermodynamic requirements leading to the stability condition domains of the different crystalline forms. The stability behavior of five APIs used or meant for oral applications has been studied as part of this work. The chemical analysis of tienoxolol, an antihypertensive drug, has demonstrated its sensitivity for hydrolysis and oxidation. Seven degradation products were identified and patterns of fragmentation have been established. Pressure-temperature phase diagrams have been constructed for bicalutamide and finasteride, drugs against prostate cancer, using a topological approach based on data available in the literature. The study demonstrates that the thermodynamic relationship (enantiotropy or monotropy) between crystalline forms under ordinary conditions can change depending on the pressure. This is important for drug development as it demonstrates how stability information can be obtained by standard laboratory measurements accessible to industrial research laboratories without the necessity to carry out experiments under pressure. The topological approach for the construction of phase diagrams has subsequently been validated by measuring transition temperatures as a function of pressure. Experiments have been carried out with benzocaine, a local anesthetic, and with cysteamine hydrochloride, a drug used against cystinosis. Two crystalline forms were observed in the case of benzocaine. They exhibit an enantiotropic relationship that becomes monotropic at high pressure. For cysteamine hydrochloride, a new crystalline form (form III) was discovered. The thermodynamic relationship between the new form III and the known form I is enantiotropic for the entire temperature and pressure range. Cysteamine hydrochloride’s sensitivity to water has been studied, as it is hygroscopic. It has been demonstrated that it becomes deliquescent in the presence of water and no trace of a hydrate has been found. Finally, a study combining thermal and chromatographic methods showed that, under the effect of temperature, cysteamine hydrochloride turns into cystamine in the solid as well as in the liquid state, The latter is known to be an important impurity of cysteamine hydrochloride. In conclusion, the approach developed in this work allowed to characterize the stability properties of a number of APIs and to determine the factors that may change these properties and influence the intrinsic stability (...)
Lavrentovich, Maxim Olegovich. "Diffusion, Absorbing States, and Nonequilibrium Phase Transitions in Range Expansions and Evolution." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13070032.
Physics
Pérez, Mellor Ariel. "Effets d’environnement sur la reconnaissance chirale : une étude spectroscopique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS466.
This work focuses on the study of chirality effects on the structure of cyclic dipeptides built on a diketopiperazine (DKP) ring with residues of identical (LL) or opposite (LD) chirality. The same systems are studied in different environments by means of optical spectroscopy coupled to quantum chemical calculations. The neutral molecules are isolated and cooled down to a few K in a supersonic expansion and characterized by UV and conformer-specific IR laser spectroscopy. The structure of the protonated systems, isolated in an ICR mass spectrometer, is determined by infrared multiple photon dissociation spectroscopy. Last, vibrational circular dichroism (VCD) is applied to the solid-state samples.The studied systems possess an aromatic residue, either tyrosine (cyclo Tyr-Pro) or phenylalanine (cyclo Phe-Phe and Phe-His). The LD diastereomer is in most of the cases less stable and more flexible than LL. LL and LD differ from each other by weak interactions like NH…π or CH…π interactions. The most stable conformer usually corresponds to a structure with the aromatic chromophore folded over the DKP ring, the other part being extended. A dramatic effect of chirality is observed for some of the protonated dimers. Last, VCD experiments in the condensed phase show that the crystal phase of LPhe-DPhe formed by solid-state dehydration of the linear dipeptide is chiral due to synchronization of the transient chirality of the monomers
Han, Jingyi. "Phrase table expansion for statistical machine translation with reduced parallel corpora: the Chinese-Spanish case." Doctoral thesis, Universitat Pompeu Fabra, 2017. http://hdl.handle.net/10803/458530.
La escasez de datos paralelos es un problema importante para la Traducción Automática Estadística (TAE). El objetivo de esta tesis es enriquecer un sistema de TAE añadiendo más variantes morfológicas y un nuevo léxico de traducción generado automáticamente desde datos monolingües. Para inducir el léxico bilingüe, en lugar de depender de corpus comparables o de datos paralelos, proponemos un clasificador supervisado entrenado con representaciones monolingües (por ejemplo, vectores distribuidos, agrupaciones de Brown e información de la frecuencia de palabras) de sólo una pequeña cantidad de traducciones. El clasificador es capaz de predecir si un nuevo par de palabras es una traducción la una de la otra, o no. Realizamos los experimentos para enriquecer el sistema de TAE con chino y español, porque a pesar de que estas lenguas son dos de las más habladas del mundo, este par de idiomas sufre de escasez de datos paralelos. Además de los problemas causados por las palabras que no están incluidas en el corpus de entrenamiento, las diferencias de flexión morfológica entre este par de idiomas hace que la traducción sea de peor calidad cuando se dispone de pocos recursos paralelos. Los resultados obtenidos demuestran que, por un lado, con el método de expansión morfológica, el sistema de TAE logra una mejora de hasta + 0,61 BLEU en comparación con los resultados obtenidos con un sistema básico chino-español con poco corpus. Por otro lado, nuestro clasificador supervisado, que alcanza una F1 de 0,94, proporciona nuevos pares de traducción que resultan en una mejora de hasta +0,70 BLEU con respecto al sistema básico, demostrando que los errores del clasificador son, en último término, controlados por el sistema de TAE.
Li, Guanshu. "Etude du phénomène de l'expansion sulfatique dans les bétons : comportement des enrobés de déchets radioactifs sulfatés." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1994. http://tel.archives-ouvertes.fr/tel-00523043.
Shafeie, Samrand. "Structure and Properties Investigations of the La2Co1+z(Ti1-xMgx)1-zO6 Perovskite System." Licentiate thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-55418.
Studies of cobalt based perovskites for cathode materials in solid oxide fuel cells.
Canivenc, Romain. "Assemblage de bagues par expansion : définition de modèles et d’outils d’assistance utiles aux phases de prédimensionnement." Toulouse, INSA, 2009. http://www.theses.fr/2009ISAT0007.
The bushing assembly by a coldworking process is particularly attractive thanks to its simplicity and its relevant efficiency in numerous design cases. The non linear behaviour of hardening materials and the miscellaneous combinations of geometrical and material characteristics leading to non assembly, make the residual state prediction complex. . . .
Belletti, Jaqueline da Silva. "Arqueologia do Lago Tefé e a expansão polícroma." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/71/71131/tde-13102015-153201/.
This paper seeks to understand the relationship between diversity of Polychrome Tradition at the local level and its significance in terms of the regional scale. From two archaeological site contexts at Lake Tefé (Middle Solimões, AM), we enter the discussions over the Amazon Polychrome Tradition and expansion models created to explain its wide geographical spread. For this, we present the debate in three parts: the description of the archaeological contexts with Polychrome material in the Lake Tefé; a general review of the existing data on the Polychrome Tradition; and a reflective discussion about the existing models to explain this tradition.