Дисертації з теми "Solids with microstructure"
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Sengul, Yasemin. "Well-posedness of dynamics of microstructure in solids." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533878.
Повний текст джерелаStone, Cora Emma. "Neutron studies of amorphous solids." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396244.
Повний текст джерелаKoumatos, Konstantinos. "The formation of microstructure in shape-memory alloys." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:1089932b-d36e-4414-b128-6f7bcfe9cdf3.
Повний текст джерелаSvanadze, Maia [Verfasser], Ingo [Akademischer Betreuer] Witt, Stan [Akademischer Betreuer] Chiriţă, David [Akademischer Betreuer] Gordeziani, and Nugzar [Akademischer Betreuer] Shavlakadze. "Non-classical problems for viscoelastic solids with microstructure / Maia Svanadze. Betreuer: Ingo Witt. Gutachter: Stan Chirita ; David Gordeziani ; Nugzar Shavlakadze." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/1077362382/34.
Повний текст джерелаChenchiah, Isaac Vikram Bhattacharya Kaushik. "Energy-minimizing microstructures in multiphase elastic solids /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05252004-131315.
Повний текст джерелаKazaryan, Andrei. "Modeling of microstructural evolution in solids /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486398195327308.
Повний текст джерелаRuddock, Guy James. "Martensitic microstructures." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1371.
Повний текст джерелаJohnson, D. R. "The microstructure of all-solid-state batteries." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375262.
Повний текст джерелаPapillon, Anthony. "Frittage de composites Cu-Cr pour l'élaboration de matériaux de contact d'ampoules à vide." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI099.
Повний текст джерелаCu-Cr composites are commonly used as contact materials for medium voltage circuit breakers vacuum bottles. Solid state sintering process of Cu-Cr composites is widespread but has been relatively little studied. Optimizing the process requires understanding the sintering mechanisms. This study was focused on two important aspects of sintering: the redox reactions associated to oxides on the powder surface and the competition between densification and swelling mechanisms during sintering.The redox reactions were studied by thermogravimetric analysis coupled to various spectroscopic techniques, first on isolated Cu and Cr, then on Cu-Cr composites. Interfaces analyses obtained by FIB clarified the location of the oxide inside the sintered materials. Oxygen transfer takes place between copper and chromium powders. This phenomenon strongly depends on the reducing character of the sintering atmosphere.Densification was analyzed by dilatometry on Cu, Cr and Cu-Cr composites. This analysis was supported by microstructural observations, including X-ray tomography .The effect of process parameters (atmosphere, heating rate, powders ...) was studied. The results show the relationship between sintering and copper oxide reduction. The swelling phenomenon of copper compacts is explained by high temperature degassing of copper during pore closure. This swelling does not occur in Cu-Cr composites as chromium delays pore closing and entraps the gases released by copper. Sintering atmosphere, chromium morphology and chromium particle size affect densification. Vacuum sintering reduces porosity. Chromium particles with spherical shape limit its inhibiting effect on densification. For small particle sizes, chromium participates to densification, leading to better densification of the material. These results open the route for optimizing the sintering of Cu-Cr composites.Cu-Cr composites were tested for short circuit performance in vacuum interrupters. The result of these tests showed the importance of reducing the chromium oxide amount. The effect of impurities commonly encountered on the powders copper and chromium powders was also determined
Jday, Rawen. "Caractérisation microstructurale du graphite sphéroïdal formé lors de la solidification et à l'état solide." Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0077/document.
Повний текст джерелаSpheroidal graphite iron castings are today widely used because of their good mechanical properties. The spheroidal shape of graphite is most often obtained by the addition of magnesium or cerium during the casting process. Spheroidal graphite can be formed at the solid-state by graphitization of cast irons which solidified partly or totally in the metastable system. The purpose of this work is to study the effect of solid-state graphitization treatment on the growth of nodular graphite of a thin wall casting which has a mottled structure at the as-cast state. This cast iron was studied using optical microscopy, scanning and transmission electron microscopy, Raman spectroscopy and electron energy loss spectroscopy. Heat treatments ensuring a total and partial graphitization to decompose the cementite formed at the solidification in graphite and austenite were realized. The nodules become more numerous and their size increases according to the time of graphitization. The microstructure after heat treatment is composed of graphite nodules and ferrite. Raman spectroscopy has been used to characterize graphite nodules in as-cast state and in samples having been fully graphitized at various temperatures in the austenite field. The results show no significant difference between Raman spectra recorded on these various samples, suggesting graphite grows with the same mechanism during either solidification or hightemperature (so-called first stage) graphitization. Transmission electron microscopy characterizations show that nodules in the as-cast material presents a multi-fold structure characterized by an inner zone where graphite is misoriented and an outer zone where it is well crystallized. In heat-treated samples, graphite nodules consist of well crystallized sectors radiating from the nucleus. These observations suggest that the misoriented zone appears because of mechanical deformation when the liquid contracts during its solidification. During heat-treatment, this zone disappears by recrystallization. The results of the present work lead to a better understanding of the nodular graphite structure in the solid state and also show that nodular graphite growth mechanism is the same during solidification and solid-state transformation
Ghosh, Supriyo. "Effects of solid-solid boundary anisotropy on directional solidification microstructures." Palaiseau, Ecole polytechnique, 2015. http://www.theses.fr/2015EPXX0043.
Повний текст джерелаRhazaoui, Khalil. "Solid oxide fuel cell microstructure and performance modeling." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23301.
Повний текст джерелаAger, C. D. "Plasmons in microstructured semiconductor 2DEGs." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385904.
Повний текст джерелаWharam, David Andrew. "Electronic transport in semiconductor microstructures." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315922.
Повний текст джерелаPindoria, Ravji Dhanji. "Microstructure-property investigations of zinc oxide varistors." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/8459.
Повний текст джерелаNess, J. N. "The microstructure of reaction-bonded silicon carbide." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373687.
Повний текст джерелаNafisi, Shahrooz. "Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy = Effets de l'affinage des grains et de la modification sur l'évolution microstructurale de l'alliage 356 semi-solide /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
Повний текст джерелаBrown, Robert James. "Electronic transport in GaAs/AlGaAs microstructures." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335681.
Повний текст джерелаField, Mark. "Single electron effects in semiconductor microstructures." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308187.
Повний текст джерелаKim, Hee-Soo. "Microstructure and deformation behaviour of semi-solid aluminium alloys." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400141.
Повний текст джерелаEastell, Christopher J. "Microstructure and properties of high temperature superconducting wires." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390462.
Повний текст джерелаVernon-Parry, Karen Dorothy. "The microstructure and properties of superconducting thin films." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280799.
Повний текст джерелаRingnalda, Jan. "The microstructure of processed 1-2-3 superconductors." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386830.
Повний текст джерелаMagrez, Arnaud. "Nouveaux oxydes électrolytes solides : relation entre microstructure et conductivité ionique." Nantes, 2002. http://www.theses.fr/2002NANT2025.
Повний текст джерелаPouryazdi, Mohammad Reza Nasseri. "The sintering, microstructure and properties of permanent magnet materials." Thesis, University of Leeds, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305744.
Повний текст джерелаBedford, Susan Edith. "Microscopy and modelling of microstructure in liquid crystalline polymers." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240126.
Повний текст джерелаSafonov, Sergey. "Noise and transport study of semiconductor microstructures." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248181.
Повний текст джерелаAssender, Hazel Elaine. "Magnetically induced microstructures in liquid crystalline polymers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321035.
Повний текст джерелаPottage, John Mark. "Analysis of thin-film photonic crystal microstructures." Thesis, University of Bath, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269994.
Повний текст джерелаSantos, Jorge. "Al-7Si-Mg semi-solid castings – microstructure and mechanical properties." Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-38693.
Повний текст джерелаLe, Quang Hung. "Microstructures solubles et relations exactes en micromécanique." Université de Marne-la-Vallée, 2005. http://www.theses.fr/2005MARN0268.
Повний текст джерелаThe macroscopic mechanical properties of a heterogeneous material depend non only on the mechanical properties of its microscopic constituents but also strongly on its microstructure. The first objective of this work is to construct a class of new microstructures for which certain macroscopic properties, linear or nonlinear, can be analytically and explicitly determined. The second purpose of the work is to show the existence of uniform fields in nonlinear heterogeneous materials and to derive the exact relations for their homogenization. Starting from the composite sphere assemblage of Hashin (1962) and Hashin and Shtrikman (1962), a good number of original results are obtained for linear heterogeneous materials. Using the concept of uniform fields and the implicit function theorem, new general relations are deduced for the homogenization of nonlinear heterogeneous materials
Pollard, Robert James. "The microstructure and magnetic properties of NdFeB based permanent magnets." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328260.
Повний текст джерелаChang, Hui. "Transformations de phase et évolutions des microstructures dans l'alliage de titane beta Ti-B19." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL053N/document.
Повний текст джерелаThe phase transformations and microstructure evolutions has been characterized for different thermal treatments, and the relationships between final microstrures and properties have been investigated in the new metastable Ti-B19 alloy. The isothermal phase transformation kinetics and the influence of different heat treatment phaths have been establisheb by using in-situ electrical Resistivity. The structures have been determined by synchrotron X-Ray Diffraction and the microstructures were observed by SEM and TEM. The results show that phase transformation kinetics and microstructure characteristics are strongly dependent on the aging temperature (ranging from 300 to 700°C). The global isothermal phase transformation phase transformation kinetics has been got and anallyzed with JMAK equation, and the TTT diagram of Ti-B19 alloy has been established. We have also shown that the heating rate has remarkable influence on the isothermal phase transformation behaviors and the pre-deformation accelerates the transformation kinetics. The microstructure evolutions during cooling are obviously dependent on the cooling rates. A first attempt has been made to calculate the transformation kinetics during cooling using JMAK law and Scheil principle. Finally, the relationship between mechanical properties and microstructure has been discussed
McQuillan, Scott. "Electromagnetic waves in Langmuir Blodgett thin film microstructures." Thesis, Queen Mary, University of London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271335.
Повний текст джерелаBeaugnon, Florian. "Caractérisation structurale multi-échelles de la calcination et de l'hydratation du gypse." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS027.pdf.
Повний текст джерелаGypsum(CaSO4·2H2O)istherawmaterialusedinplastermanufacture. Heatedbetween100and200 °C, it partially dehydrates into hemihydrate (CaSO4· 1 2H2O) which, when mixed with water, dissolves while gypsum crystals precipitate and form a tough matrix. This simple cycle is complicated by other phases in the system, including two forms of anhydrite (CaSO4). In addition, microstructures, which are poorly understood, affect the reactivity and stability of the dehydration products as well as the kinetics of transitions. The dehydration of gypsum single crystals, observed by Synchrotron X-ray microtomography, revealed the anisotropy of the reaction. Water vapor pressure and temperature affect the kinetics as well as the microstructures that are organised on several scales and reflect the structure of gypsum in spite of the microcrystalline fragmentation. X-ray powder diffraction and scanning electron microscopy showed that the change in symmetry during the transition from γ-anhydrite to β-anhydrite leads to a high-frequency twinning, resulting from the stacking of two symmetrical variants that minimises mechanical stress. Finally, a methodology was developed to measure the water-to-plaster ratio and the reactive powder morphology in set plaster samples using synchrotron X-ray microtomography. It was applied to a case study of 13 florentine low-relief sculptures from the 15th century, bringing new insights on workshop practices
Vargas-Gonzalez, Lionel Ruben. "Microstructural optimization of solid-state sintered silicon carbide." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34691.
Повний текст джерелаSchmitz, Guido [Verfasser]. "Microstructural mechanisms of solid state interreactions / Guido Schmitz." Münster : Universitäts- und Landesbibliothek der Westfälischen Wilhelms-Universität, 2004. http://d-nb.info/1042742332/34.
Повний текст джерелаTocino, Florent. "Contrôle microstructural des réactions rédox à l'interface solide/solution lors de la dissolution d'oxydes mixtes à base d'uranium (IV)." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS247/document.
Повний текст джерелаIn the field of the use of actinides mixed oxides as potential fuels for the Gen(III) and Gen(IV) nuclear reactors, solid solutions with general formula U1-xThxO2, U1-xCexO2-y, U0.75Nd0.25O1.875, U0.75Gd0.25O1.875 and Th0.75Nd0.25O1.875 were prepared by thermal conversion of oxalate precursors. Dense pellets exhibiting various physico-chemical and microstructural properties (in terms of composition, homogeneity, densification rate, …) were prepared through sintering then submitted to dissolution tests.The multiparametric study of the dissolution, performed in nitric, sulfuric and hydrochloric media clearly underlined the important effect of the chemical composition on the chemical durability of the samples. Indeed, several parameters (including partial order related to proton activity, apparent activation energy) confirmed the significant modification of the preponderant dissolution mechanism for uranium-enriched samples. Moreover, the role of various nitrogen-based species was evidenced at the solid/solution interface.The evolving of solid/solution interfaces (reactive surface area, composition) during dissolution was monitored by the means of operando ESEM experiments. Preferential dissolution zones (triple junctions, grain boundaries, inter- and intra-granular porosities) were clearly observed for uranium-depleted samples. They induce a significant increase of the reactive surface area even for short progress of the reaction. On the contrary, the dissolution appeared more homogenous for uranium-enriched samples due to the existence of a preponderant mechanism associated to the oxidation of the uranium(IV) at the interface
Milhans, Jacqueline Linda. "Microstructure-based solid oxide fuel cell seal design using statistical mechanics." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37188.
Повний текст джерелаGeorge, Sarah Louise. "Composition and microstructure evolution in semi-solid cast Al-Zn alloys." Doctoral thesis, Faculty of Engineering and the Built Environment, 2010. http://hdl.handle.net/11427/33596.
Повний текст джерелаEl, Kalkouli Rachid. "Microstructure et propriétés physiques d'alliages magnétiques obtenus par mécanosynthèse." Poitiers, 1995. http://www.theses.fr/1995POIT2313.
Повний текст джерелаLemmon, Timothy John. "Microstructural analysis of a liquid-crystalline aromatic copolyester." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317931.
Повний текст джерелаFindlay, Robert Buchanan. "Control of the orientation and microstructure of some side chain liquid crystalline polymers." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386701.
Повний текст джерелаXu, Jinye, and 徐金叶. "Two-photon photochemical crosslinking-based fabrication of protein microstructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47179223.
Повний текст джерелаpublished_or_final_version
Mechanical Engineering
Master
Master of Philosophy
König, Mathias. "Microstructure Formation During Solidification and Solid State Transformation in Compacted Graphite Iron." Doctoral thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH. Forskningsmiljö Material och tillverkning – Gjutning, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-15694.
Повний текст джерелаTricker, David Michael. "The microstructure of solid oxide fuel cells and related metal/oxide interfaces." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261539.
Повний текст джерелаSanseau, Olivier. "Elaboration et étude d'éléments pour piles à combustible à oxydes solides." Paris, ENMP, 2002. http://www.theses.fr/2002ENMP1126.
Повний текст джерелаKhamidy, Nur Istiqomah. "Microstructure et durabilité de nickélate de lanthane dopé au praséodyme pour cellules à oxydes solides." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI020.
Повний текст джерелаCoupling fuel cell and electrolysis technologies provide an attractive solution to absorb the fluctuations induced by the deployement of the intermittent renewable energy sources. In this frame, the technology based on the "Solid Oxide Cells" (SOCs) appears as a promising solution as the same device can be alternatively used in both the electrolysis and fuel cell modes. The SOCs are based on an oxide ceramic electrolyte operating at a high temperature (800-1000 °C) allowing to reach very good efficiency. Hovewer, their durability is still insufficient to envisage their economic deployment. An important issue limiting the SOCs lifetime is the chemical and mechanical destabilizations of the oxygen electrode, as well as its chemical reactivity with the electrolyte upon operation. Moreover, the high operating temperature of SOCs leads to severe constraints on materials assembling and on fabrication processes.The objectives of this PhD thesis are to better understand the role of microstructure and the reaction mechanisms of oxygen electrode in SOCs operating in intermediate temperature (650-800 °C) and to investigate the aging in electrolysis and fuel cell modes through an integrated approach coupling electrochemical and physicochemical characterizations with modeling. In this work, architecturally designed LaPrNiO4+δ, referred to as LPNO, oxygen electrode has been prepared on Ce0.9Gd0.1O2-δ electrolyte by taking advantage of the complementary properties of La2NiO4+δ and Pr2NiO4+δ extremes, i.e. larger chemical stability of La2NiO4+δ and larger electrochemical activity of Pr2NiO4+δ. The performances of SOCs are not only due to the intrinsic properties of materials but also to the association of functional structured materials and the properties of their interfaces. In this frame, novel architectures based on an active functional layer (AFL) fabricated by electrostatic spray deposition (ESD) and topped by an optimized current collecting layer (CCL) deposited by screen-printing (SP) have been optimized aiming to decrease the operating temperature in order to improve the performances and the lifetime. A unique coral-like nanostructured AFL with large porosity and good adhesion on the electrolyte has been proved to be of great importance in the oxygen electrode reactions. The electrode performance and durability in symmetrical SOCs and in a complete electrolysis cell have been investigated in detail in thermal aging and in galvanostatic mode. These data have been thoroughly discussed in relationships with structural and microstructural evolution of LPNO oxygen electrode thanks to post-mortem characterizations using scanning electron microscopy, 3D reconstruction by focused ion beam-SEM, laboratory X-ray diffraction and synchrotron X-ray µ-diffraction and µ-fluorescence
Kyriakides, Steven Alan. "Characterization of Shear Strengths and Microstructures for Solid Rocket Motor Insulation Materials." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35974.
Повний текст джерелаMaster of Science
Al-Jiboory, Muhammed Mekki. "Magnetic and microstructural properties of single crystal terfenol-D." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333993.
Повний текст джерела