Dissertations / Theses on the topic 'Thermodynamic behaviors'
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Zhao, Yiqiang. "Thermodynamic and Dynamic Behaviors of Self-Organizing Polymeric Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1094190642.
Full textSabatini, Benjamin J. "Chemical composition, thermodynamics, and recycling : the beginnings of predictive behavioral modeling for ancient copper-based systems." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:91a4426b-8232-4f85-a39b-69e6c01c327c.
Full textLee, Won Peter. "The thermodynamic behavior of magnetite in non-ferrous smelting." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0022/NQ50091.pdf.
Full textGoulko, Olga. "Thermodynamic and hydrodynamic behaviour of interacting Fermi gases." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/241497.
Full textLu, Xia. "Nonequilibrium thermodynamic models for the dynamic behavior of polycrystalline solids." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/12549.
Full textIyer, Jaisree (Jaisree Kannan). "Modeling the micellization behavior of fluorosurfactants using molecular-thermodynamic theory." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81750.
Full textThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 267-281).
Fluorinated surfactants are an important class of surfactants because they possess properties that are far superior than those of their hydrocarbon analogs. As a result, they are used in a wide variety of applications including in paints, polishes, fire-fighting foams, and emulsion polymerization processes. However, concerns regarding the non-biodegradability and toxicity of fluorinated surfactants have prompted the search for new, benign alternative surfactant formulations that possess micellization properties comparable to those of traditional fluorinated surfactants. With this need in mind, this thesis focuses on gaining a molecular-level understanding of the micellization behavior of traditional fluorinated surfactants, and then using the acquired knowledge to design novel surfactant formulations that can reduce the use of fluorinated surfactants. Molecular-thermodynamic (MT) models were developed to calculate the various contributions to the free energy of micellization for discoidal and biaxial ellipsoidal micelles; two important micelle shapes in the context of fluorocarbon-based surfactants. These models explicitly incorporate the effect of the position-dependent curvature associated with discs and biaxial ellipsoids. Comparison between the models developed here with those that do not explicitly account for the varying curvature shows that accounting for the position-dependent curvature is extremely important in modeling these two micelle shapes. The new MT model for the free energy of micellization is also used to demonstrate the feasibility of realizing biaxial ellipsoidal micelles, a result refuted in the past in many theoretical studies on the basis of average geometrical properties of the micelle. A new computer-simulation-molecular-thermodynamic (CSMT) framework was developed to predict the micellization behavior of mixtures of fluorocarbon-based surfactants. To facilitate the practical implementation of the mixture CSMT framework, which involves the computationally intensive task of simulating several mixed micelles, an approximation to the mixture CSMT model was developed. In this approximation, relevant properties for a mixed micelle are estimated using a micelle-composition based weighted average of the analogous properties obtained from simulations of the single-component surfactant micelles for each of the surfactants comprising the mixture. Therefore, in this approximation, the need for simulating mixed micelles is eliminated. The approximation was found to compare well with the mixture CSMT model for various binary surfactant mixtures considered, except for those containing alkyl ethoxylate surfactants. A rationalization of this finding is presented. CMC predictions made using the mixture CSMT model were found to compare very well with the experimental CMCs for several binary mixtures of linear surfactants, thereby laying the foundation for using the CSMT model to predict micellization properties of mixtures of surfactants that have a more complex chemical architecture. Finally, an MT framework was also developed to predict the micellization properties of mixtures of fluorocarbon-based and hydrocarbon-based surfactants. This mixing reduces the use of fluorinated surfactants in the surfactant formulation, thereby addressing the non-biodegradability and toxicity concerns associated with fluorinated surfactants. An enthalpy of mixing contribution resulting from the interactions between the fluorocarbon tails and the hydrocarbon tails, estimated using the Regular Solution Theory, was included in the MT framework. The ability of the MT framework to predict the coexistence of two types of mixed micelles in solution was demonstrated. The MT framework predictions of micelle population distributions, CMCs, and optimal micelle compositions were compared with the experimental values for various mixtures of fluorocarbon-based and hydrocarbon-based surfactants. The models developed in this thesis provide a molecular level understanding of the micellization behavior of fluorocarbon-based surfactants and their mixtures. The models are able to predict several important micellization properties of surfactants and their mixtures that can guide surfactant formulators in the synthesis, characterization, design, and optimization of surfactant formulations that exhibit desirable properties.
by Jaisree Iyer.
Ph.D.
Zhong, Tingjun. "The thermodynamic behaviour and miscibility of discotic liquid crystals." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/11833/.
Full textNeal, Colleen M. "Probing the thermodynamic behavior of metal cluster ions by mass spectrometry." [Bloomington, Ind.] : Indiana University, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3297103.
Full textTitle from dissertation home page (viewed Sept. 29, 2008). Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 0988. Adviser: Martin F. Jarrold.
Draucker, Laura Christine. "Novel Solvent Systems for the Development of Sustainable Technology." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16188.
Full textAssis, Andre N. "The Phosphorus Reaction in Oxygen Steelmaking: Thermodynamic Equilibrium and Metal Droplet Behavior." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/464.
Full textLee, Katherine Ann. "The thermodynamic and phase behaviour of catalysed reactions in supercritical fluids." Thesis, University of Leeds, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400173.
Full textReid, Joshua Elias Samuel James. "Molecular thermodynamics and solvation behaviour of protic ionic liquid systems." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18697/.
Full textTepesch, Patrick David. "Atomistic modeling of ceramic materials : predicting crystal structures, thermodynamic properties, and diffusion behavior." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10936.
Full textDu, Toit Adam Jacobus. "Thermodynamic behaviour of sulphur and chlorine as minor elements in metallurgical melts." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5379.
Full textThis thesis is presented on the equilibrium studies that have been carried out on a series of slags, specifically chosen to cover the range of composition and conditions appropriate to the melters of the platinum group metals (PGM) producers of South Africa. New measurements have been made on the ferric to ferrous ration, sulphide capacity as well as the chloride capacity mainly for the PGM melter-type slags.
Tan, Geraldine. "Thermomechanical behaviour of NiTi." University of Western Australia. School of Mechanical Engineering, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0111.
Full textFeng, Li. "Investigation of the Relationships Between the Thermodynamic Phase Behavior and Gelation Behavior of a Series of Tripodal Trisamide Compounds." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342461003.
Full textLogan, Kathryn Vance. "Elastic-plastic behavior of hot pressed composite titanium diboride/alumina powders produced using self-propagating high temperature synthesis." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15853.
Full textBhinde, Tej. "Adsorption of alkyl amides : monolayer structures and mixing behaviour." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/236781.
Full textPinna, Matteo. "Thermodynamic behaviour of gravity - attempts at a statistical derivation of the field equations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19487/.
Full textRobinson, Ellis Shipley. "Mixing and Phase Behavior of Organic Particles." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/411.
Full textSundarasaradula, Doy. "A thermodynamical perspective on organisations their structure and evolution /." Access electronically, 2006. http://ro.uow.edu.au/theses/101.
Full textSalah, Mohammad. "A Method to Improve the Performance of Capillary Barriers Using Heated Air Flow." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41100.
Full textKim, Yong-ju. "Phase behavior of disk-coil molecules : from bulk thermodynamics to blends with block copolymers." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81059.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 159-164).
In this thesis, we explore the phase behavior of discotic molecules in various circumstances. We first study the thermodynamics of disk-coil molecules. The system shows rich phase behavior as a function of the relative attractive strength of coils ([lambda]), the stacking interaction strength of disks ([mu]), the number of coarse-grained monomers of the coil (Nc), and the reduced temperature (T*). At high T*, a disordered phase is dominant. At intermediate T*, lamellar, perforated lamellar, and cylinder phases appear as y and Nc are increased. At low T*, disks crystallize into ordered lamellar, ordered perforated lamellar, and ordered cylinder phases. We find that the confinement imposed on the disks by the attached coils strongly contributes to the ordered stacking of the disks. In particular, the ordered cylinder phase contains highly ordered disks stacked in parallel due to the cylindrical confinement of the coils that restricts the system to a single degree of freedom associated with the director vector of the disks. Our results are important for understanding the self-assembly of supramolecular structures of disk-coil molecules that are ubiquitous in nature, such as chlorophyll molecules. Having established the importance of confinement on the phase behavior of discotic molecules, we next study blends of discotic molecules and block copolymers (BCPs) using self-consistent field theoretic simulations. In particular we explore systems containing a single sphere, rod, or discotic molecule confined within a BCP defect and systems containing multiple discotic molecules confined within BCP cylinders. In the former case, the sphere, rod, and discotic molecules are all trapped in the defect center where the cylinders of the surrounding BCPs make a junction. The director vector of the rod molecule aligns with the axial direction of one of the cylinders, while the director vector of the discotic molecule aligns perpendicular to the axes of all the cylinders. This preferential orientation is induced by the minimized stretching energy of the BCPs for these configurations. For the system with multiple discotic molecules confined within the BCP cylinders, all director vectors are aligned with the axial direction of the cylinder when the density of disks is high to minimize both the stretching energy of the BCPs and the polymer-mediated potential between the disks. These results provide design principles for next generation optoelectronic devices based on blends of discotic molecules and BCPs.
by YongJoo Kim.
Ph.D.
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.
Full textSpike, M., and R. Miles. "The fundamental thermodynamic relation on contact surfaces of multicomponent nanocomposite coatings with hierarchical and adaptive behavior." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47079.
Full textGernandt, Jonas. "On the phase behaviour of hydrogels : A theory of macroion-induced core/shell equilibrium." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-188151.
Full textBenge, G. Gregory. "A comparison of thermodynamic models for the prediction of phase behavior in aqueous-polymer two-phase systems." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/90936.
Full textM.S.
Andersson, Martin. "Structural, thermal and thermodynamic properties of some Ln-Pd oxides and their behaviour as catalyst precursors." Doctoral thesis, Stockholms universitet, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64279.
Full textHärtill 5 uppsatser
Al-Abbasi, Omar Abdulaziz. "Modeling the Non-Equilibrium Behavior of Chemically Reactive Atomistic Level Systems Using Steepest-Entropy-Ascent Quantum Thermodynamics." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/24069.
Full textPh. D.
Mukherjee, Sundeep Johnson W. L. "Study of crystallization behavior, kinetics and thermodynamics of bulk metallic glasses using noncontact electrostatic levitation technique /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-01282005-111916.
Full textLebelo, Ramoshweu Solomon. "Analysis of greenhouse gas emission from reactive materials and its thermodynamics." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1302.
Full textThe environment is polluted by many gases of which carbon dioxide is one of them and unfortunately during the emission of carbon dioxide, oxygen, which is very important for keeping all species alive, is depleted. Increased industrial activities led to more emission of carbon dioxide and ultimately global warming arose as a result of the greenhouse effect. Global warming has resulted with high temperatures and carbon dioxide production in the atmosphere and it was necessary to come up with mathematical modelling to investigate processes that may try to reduce temperature rise, carbon dioxide emission and oxygen depletion in a stockpile of combustible material. The work done in this thesis considered three differential equations, first for temperature behaviour, second for oxygen depletion and third for carbon dioxide emission. The three equations were solved simultaneously for a reactive slab of combustible material. An exothermic reaction in a stockpile of combustible material results due to the reaction of oxygen with reactive hydrocarbon material and the products are usually heat and carbon dioxide. A detailed discussion on this part is given in chapter 1, and also some definitions of terms applied in this work, together with literature review, statement of problem, aim of the study, objectives of the study and methodology are part of the chapter. In chapter 2, the nonlinear partial differential equations governing the process are derived.
Uan-Zo-li, Julie Tammy. "Morphology, Crystallization and Melting Behavior of Propylene-Ethylene Statistical Copolymers." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29143.
Full textPh. D.
Kilit, Emel. "Critical Behaviour Of The Thermodynamic Quantities For The Thermotropic And Ferroelectric Liquid Crystals Close To The Phase Transitions." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612963/index.pdf.
Full textGil-García, Álvaro Antonio. "Thermodynamic behaviour of supercritical water as working fluid in advanced coal-fired power plants : simulation and design study." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7734/.
Full textSundaram, Dilip Srinivas. "Multi-scale modeling of thermochemical behavior of nano-energetic materials." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50225.
Full textBruckner, Robert Jack. "Simulation and Modeling of the Hydrodynamic, Thermal, and Structural Behavior of Foil Thrust Bearings." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1089304186.
Full textGoswami, Ishan. "Computational and Experimental Investigation of the Critical Behavior Observed in Cell Signaling Related to Electrically Perturbed Lipid Systems." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97564.
Full textPh. D.
Räbiger, Klaus Edmund. "Fluid dynamic and thermodynamic behaviour of multiphase screw pumps handling gas-liquid mixtures with very high gas volume fractions." Thesis, University of South Wales, 2009. http://hdl.handle.net/10265/561.
Full textHuang, Jia. "Rapid determination of fatigue behaviour for carbon fiber reinforced polymer laminates based on thermodynamic phenomena observed by IR thermography." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30033.
Full textIn order to achieve weight reduction of composite structures and reduce manufacturing and operating costs, fatigue behavior of Carbon Fiber Reinforced Polymer (CFRP) laminates has received more and more attention. The objectives of this thesis are to develop methodologies to evaluate the fatigue behavior of CFRP laminates in a short time based on the analysis of thermodynamic data measured by an infrared camera and to investigate the inherent correlation between energy dissipation and fatigue damage. Three new numerical methods based on statistical analysis for the treatment of the thermal data are firstly proposed to avoid man-made uncertainties in the traditional graphic methods such as Luong's method and Risitano's method. Those proposed methods are all evaluated by the experimental data from literature to determine the fatigue limit with uniqueness. Then, a two-parameter model is proposed to characterize the stiffness degradation of CFRP laminates with the increase of cycle numbers. After the calibration of parameters and the calculation of the normalized failure threshold stiffness, the whole S-N curve can be obtained in a very short time. Thereafter, the relationship between fatigue damage and heat generation is studied. Depending on the different causes, the generated heat is classified into two parts - induced by internal friction and induced by damage accumulation. The total heat generation corresponding to damage appears to be independent of loading amplitude, and this conclusion can also be used to predict the S-N curve with good precision
Lazarou, Georgia. "Development of the SAFT-γ Mie equation of state for predicting the thermodynamic behaviour of strong and weak electrolyte solutions." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/60588.
Full textRillard, Jean. "CO2 perturbation in aquifers : reaction kinetics and metals behavior." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10033/document.
Full textThe aim of this thesis was to investigate hydrogeochemical perturbation induced by CO2 in natural aquifers. In a first step, we used chemical data from natural CO2-rich hydrothermal water. We studied variation of fluid chemical composition as a function of CO2 content in order to evaluate reactivity of minerals composing the initial reservoir. Fluid chemical analyses showed decrease in pH, and systematic enrichment in alkalinity and major cations correlated to increase in CO2 content. Chemical reaction was studied by kinetic approach to estimate variation of mineral reactive surface area as function of CO2 perturbation. Results showed that mineral reactive surface area could varied by two to four orders of magnitude as a function of CO2 perturbation. In a second step a field experiment of injection of water saturated with CO2 in aquifer has been carried out. Analysis of groundwater composition before and after injection allowed to study the impact of CO2 perturbation on water-rock interaction processes. A particular focus was made on dissolved metals behavior. Results showed a decrease in pH (from 7.3 to 5.7), involved with enrichment in alkalinity by a factor two, and by approximately one order of magnitude for dissolved metals (Fe, Mn, Zn) and by a factor two for As. Saturation index showed that dissolution of metals oxide such as ferrihydrite was correlated to iron release. These results showed that, in our field experimental conditions, CO2 perturbation induced an enrichment in dissolved elements with more significant effect on dissolved metals. These results highlight the importance of proper physic-chemical characterization of fluid and reservoir rock and in-situ kinetic of reaction in the eventual option of Co2 geological storage
Oliveira, Júnior Arilson José de [UNESP]. "Dispositivo móvel para análise de conforto térmico e ambiência." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144203.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Nos países de clima tropical, como o Brasil, um dos maiores desafios para produção animal e trabalho humano são os fatores ambientais, como altas temperaturas e umidades dentro de ambientes, assim como as tipologias das instalações, muitas vezes limitantes para o desempenho produtivo. O conforto térmico e a ambiência são áreas de estudo que tem por objetivo conceder o bem-estar para indivíduos, sejam eles animais ou seres humanos. Nos dias atuais grande parte das análises de conforto térmico no meio agrícola, ressaltando às em ambientes de produção animal, utilizam índices que possibilitam a avaliação do nível de estresse térmico de um determinado local por meio de variáveis climatológicas, como o Índice de Temperatura e Umidade – ITU, Índice de Temperatura de Globo Negro e Umidade – ITGU e Índice de Temperatura Equivalente – ITEq. Semelhantemente, em locais de trabalho humano há um limite de tolerância para exposição ao calor que deve ser monitorado mediante o chamado Índice de Bulbo Úmido Termômetro de Globo – IBUTG. Para a resolução desses índices, não há atualmente um sistema computacional específico, de hardware e software, que forneça, em tempo real, a condição térmica de um ambiente. Deste modo, o presente trabalho teve por objetivo desenvolver um sistema computacional capaz de avaliar, em tempo real, o conforto térmico de instalações de produção animal e de ambientes de trabalho humano. O sistema foi desenvolvido baseado na criação de um dispositivo portátil para coleta e transmissão das variáveis climatológicas de temperatura do ar, temperatura de globo negro e umidade relativa do ar, e do desenvolvimento de um aplicativo para smartphones e tablets Android. O dispositivo portátil foi desenvolvido utilizando um microcontrolador padrão Arduino, juntamente com sensores de temperatura e umidade relativa do ar. Para o desenvolvimento do aplicativo para dispositivos móveis, foi utilizado a linguagem de programação orientada a objetos Java no ambiente de desenvolvimento integrado Android Studio. O aplicativo para dispositivos móveis e o dispositivo portátil foram aplicados em diferentes ambientes e apresentaram correta medição de variáveis climatológicas e cálculo dos índices de conforto térmico. O dispositivo portátil demonstrou ser um produto funcional na transmissão de dados para dispositivos móveis.
In tropical weather countries, such as Brazil, one of the greatest challenges for animal production and human work environments are environmental factors, among them high temperature and humidity inside of the environments, as well as the type of facilities which are limiting for productive performance. The thermal comfort and the ambience are study areas that aims the well-being of individuals, whether they are animals or humans. It is possible to define thermal comfort as the pleasant thermal sensation of the body, in which are not necessary physiological efforts to keep the body in thermal balance. Nowadays, several analysis of thermal comfort in the agriculture environment, mainly at environments of animal production, apply indexes to make it possible the evaluation of thermal stress level of a specific place through the climatological variables, for instance, the Temperature and Humidity Index – THI, Black Globe-Humidity Index – BGHI and Heat Load Index – HLI. In the same way, at places of human work, there is a tolerance limit for heat exposition that should be monitored by the known Wet-bulb Globe Temperature Index – WBGT index. Currently, for resolution of these indexes, there is not a specific computational system (hardware and software) that provides the thermal comfort of an environment in real time. Therefore, the present work aimed to develop a computational system with features to evaluate in real time the thermal comfort of facilities of animal production and human work. The system was developed based on the creation of a mobile device to collect and transmit weather variables from the air temperature, black globe temperature and relative air humidity, and also the development of an app for smartphones and tablets. The mobile device was developed using the Arduino microcontroller, along with sensors of air temperature and relative humidity. For the development of the app it was used the Java oriented object program language, with the Android integrated development environment. The app for mobile devices and the portable device were applied in different environments and both presented a correctly measurement of climatological variables and the calculating of thermal comfort indexes. The portable device proved to be a functional product in data transmission for mobile devices.
Papaioannou, Vasileios. "A molecular-based group contribution equation of state for the description of fluid phase behaviour and thermodynamic derivative properties of mixtures (SAFT-γ Mie)." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11135.
Full textTsiotas, Achilleas Athanasios. "The role of the chain extender on the phase behaviour and morphology of high hard block content thermoplastic polyurethanes : thermodynamics-structures-properties." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/the-role-of-the-chain-extender-on-the-phase-behaviour-and-morphology-of-high-hard-block-content-thermoplastic-polyurethanes-thermodynamicsstructuresproperties(d2aa856c-7cd0-46e5-a354-4b9038c87166).html.
Full textNiermann, Michael [Verfasser]. "Thermodynamische Eigenschaften und Umsatzverhalten von Salzhydraten zur Speicherung und Transformation von Wärme : Thermodynamic properties and conversion behavior of salt hydrates for heat storage and transformation / Michael Niermann." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1223095843/34.
Full textHölz, Peter [Verfasser], and T. [Akademischer Betreuer] Böhlke. "A dynamic and statistical analysis of the temperature- and fatigue behavior of a race power unit – The effect of different thermodynamic states / Peter Hölz ; Betreuer: T. Böhlke." Karlsruhe : KIT Scientific Publishing, 2020. http://d-nb.info/121344781X/34.
Full textKobsch, Anaïs. "Behavior of feldspars during the Giant Impact." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEN026.
Full textThe impact of a planet in formation with the proto-Earth, also known as the Giant Impact, is now the main hypothesis for the Moon formation. Nevertheless, there are still discrepancies between the impact simulations and the observations of the current Earth-Moon system. To improve their models, geophysicists need a better understanding of geological materials not only at high pressures and high temperatures, typical of impacts, but also at low pressures and high temperatures, typical of the debris disc that follows the impact. Since this latter region cannot be reached by experiments we use here ab-initio molecular dynamics simulations. We work on feldspars, with formula (Ca,K,Na)(Al,Si)4O8, as they represent the major mineral component of the crust of terrestrial bodies. Using the VASP® code for numerical experiments and the home-made UMD package for post-processing, we obtain structural, transport and thermodynamic data on a wide range of temperatures (2000–7000 K) and densities (0.5–6 g.cm−3). The three feldspar end-members display a critical density between 0.4 and 0.9 g.cm−3 and critical temperatures as follows: 5000 K < TK < 5500 K, 6000 K < TNa < 6500 K and 7000 K < TCa < 7500 K. At low densities and below the critical temperatures, we can identify the start of gas bubble nucleation. The vaporization is incongruent, the gas is mostly made of free Na or K and of SiO, SiO2 or O2 molecules. There is an O2 degassing of the fluids above 4000 K at all densities. Our study at very high temperatures and pressures tells us that impacts in a cold crust would at most melt the crust, whereas impacts in a hot crust or in a magma ocean would completely bring the crust into supercritical state
Moradian, Farzad. "Ash Behavior in Fluidized-Bed Combustion and Gasification of Biomass and Waste Fuels : Experimental and Modeling Approach." Doctoral thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-9563.
Full textDurairaj, Vinobalan. "A SYSTEMATIC STUDY OF THERMODYNAMIC AND TRANSPORT PROPERTIES OF LAYERED Can+1(Ru1-xCrx)nO3n+1." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/661.
Full textLei, Xiaoqin. "Theoretical modelling of coupled chemo-hydro-mechanical behaviour of unsaturated expansive clays." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0074.
Full textArgiles gonflantes utilisées dans la pratique de l'ingénierie sont généralement insaturés et sont sensibles à la composition chimique de la solution dans les pores. Pour analyser les problèmes complexes couplés impliqués, un modèle mathématique efficace qui peut expliquer ces comportements chimio-hydro-mécanique a été développé. Dans cette thèse, argiles gonflantes sont conceptualisés dans triphasés multi-espèces de milieux poreux. Sur la base de la théorie de mélange modifié et thermodynamique irréversible, un cadre thermo-électro-chimio-hydro-mécanique a été développé. L'inégalité de Clausius-Duhem, qui régit les dissipations associés au travail mécanique, transformation de phase, le transport de masse et le transport thermique, est rigoureusement dérivée. Basé sur ce cadre thermodynamique, lois de comportement pour liquides en vrac et le sel de transport de masse, transfert de masse de l'eau entre en phase libre et adsorbé, et les déformations chimio-élastique-plastique de squelette du sol ont été développés. Le modèle a été mis en œuvre dans le logiciel FÉM Bil et validé en simulant les données expérimentales disponibles sur les argiles de Boom. Qui plus est, le processus d'infiltration de sel dans une couche d'argile gonflante insaturés a été simulée pour illustrer l'applicabilité du modèle