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Dissertations / Theses on the topic 'Thermal and mechanical stability'

Author: Grafiati

Published: 23 September 2022

Last updated: 31 July 2025

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1

Chen, Yu-Hsiang. "Mechanical and thermal stability of hard nitride coatings." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/665071.

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Hard coating 's thermal stability is essential due to the high temperature environment of high-speed cutting applications, while the induced phase and microstructure evolution affects the mechanical properties. In this thesis, the mechanical stability of arc-evaporated hard nitride coatings annealed at high temperature is analyzed and connected to the phase evolution. In addition to hardness, fracture toughness is evaluated by surface and cross-sectional investigations by scanning/transmission electron microscopy of damage events by mechanical tests. The crack resistance of Ti1-xAixN with a r

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2

Lee, Heon Ju 1977. "Thermal stability of nano-structured selective emitters for thermophotovoltaic systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78173.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 97-103).<br>A fundamental challenge in solar-thermal-electrical energy conversion is the thermal stability of materials and devices at high operational temperatures. This study focuses on the thermal stability of tungsten selective emitters for thermophotovoltaic (TPV) systems which are anticipated to enhance the conversion efficiency. Selective emitters, 2-D photonic crystals, are periodic micro/nano-scale structures

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Cerezo, Frances Therese, and francestherese_cerezo@hotmail com. "Thermal stability and mechanical property of polymer layered graphite oxide composites." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080627.161157.

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Polymer composites formed from layered fillers with high surface volume ratio show enhanced reinforcement. Graphite oxide is a high modulus material that can be separated into thin layers with high surface area. The aim of this study is to prepare polymer layered graphite oxide composites using functionalised polyolefin to enhance compatibility with various forms of layered graphite oxide in varying concentration. Functionalised polyolefins reinforced with layered graphite oxides and expanded graphite oxides were prepared using solution blending and melt blending methods. Three different mi

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4

Gargarella, Piter. "Phase formation, thermal stability and mechanical behaviour of TiCu-based alloys." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-133969.

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The large elastic limit, the strength close to the theoretical limit, the excellent magnetic properties and good corrosion resistance of bulk metallic glasses (BMGs) make them promising for several applications such as micro-geared motor parts, pressure sensors, Coriolis flow meters, power inductors and coating materials. The main limitation of these materials is their reduced macroscopic ductility at room temperature, resulting from an inhomogeneous deformation concentrated in narrows shear bands. The poor ductility can be overcome by the incorporation of a ductile second phase in the glassy

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5

Ghazinezami, Ali. "Fire retardancy, thermal stability and mechanical properties of polymeric based nanocomposites." Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/10631.

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Polymeric materials have a wide variety of applications in many manufacturing industries. However, because of the molecular structures and chemical compositions of polymeric materials, they have considerably low resistances against fire or heat. Although these materials are highly flammable, their flame retardancy can be improved significantly by incorporating the flame retardant nanomaterials. Nanoclay, nanotalc and graphene are some of the examples of the flame retardant nanomaterials. These are highly cost effective and environmentally friendly for these applications. These inclusions have

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6

Karimzadeh, F., V. Rastar, and M. H. Enayati. "Thermal Stability and Mechanical Properties of Al-Al2O3 Nanocomposite Produced by Mechanical Milling and Hot-Pressing." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34932.

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In this study, Al-Al2O3 nanocomposite powders containing 5, 10 and 15 Wt% of nanopowder were produced by mechanical alloying. For comparing, Al-Al2O3 composite powder containing 5Wt% of micrometric Al2O3 was also produced. The powder was then hot-pressed in a mold to produce bulked parts. The effect of Al2O3 content on grain growth, density, hardness and bending strength of bulked composite was discussed and microstructures were investigated by optical, scanning and transmission electron microscopy. The results revealed that when nanometric particles were used instead of micrometric

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7

Pakiela, Z., L. Jarosz, K. Nowak, and L. Olejnik. "Thermal Stability and Mechanical Properties of 5483 Al Alloy Processed by ECAP." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35435.

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Equal Channel Angular Pressing (ECAP) is one of the methods which allows to obtain ultrafine-grained and nanocrystalline metallic materials. It is well known that microstructure of materials pro-cessed by ECAP in not very stable. There were published many experimental and theoretical evidences of this fact obtained by various methods such as microstructure observations, properties measurement and computer modeling. The aim of presented paper was to investigate the thermal stability of microstructure and mechanical properties of the Al 5483 alloy processed by ECAP. As a result of performed inv

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8

Sperling, Evan Andrew. "Processing, mechanical properties, and thermal stability of nickel-aluminide multilayered thin films." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409231969.

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9

Garcia, de la Cruz Lucia. "Ultrafine grained nickel processed by powder metallurgy : microstructure, mechanical properties and thermal stability." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC224.

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La synthèse par métallurgie des poudres de nickel à grains ultrafins (UFG) a été effectuée, et l’effet de l’affinement de la microstructure sur le comportement mécanique et les propriétés physiques a été étudié. La possibilité de coupler le broyage et le frittage flash est étudiée avec des résultats prometteurs. Des échantillons de haute densité avec des tailles de grains d = 0.65 – 4 µm, caractérisés par une fraction élevée des joints de grains Σ3 et un faible niveau de contrainte ont été synthétisés. Les propriétés mécaniques des échantillons UFG montrent une bonne combinaison ductilité-rési

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10

Stahl, Brian James. "Thermal Stability and Performance of Foil Thrust Bearings." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333722754.

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11

Andersson, J. Christer. "Rock mass response to coupled mechanical thermal loading : Äspö pillar stability experiment, Sweden /." Stockholm : Division of Soil and Rock Mechanics, Department of Civil and Architectural Engineering, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4287.

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12

Andersson, J. Christer. "Rock Mass Response to Coupled Mechanical Thermal Loading : Äspö Pillar Stability Experiment, Sweden." Doctoral thesis, KTH, Jord- och bergmekanik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4287.

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The geological disposal of nuclear waste, in underground openings and the long-term performance of these openings demand a detailed understanding of fundamental rock mechanics. A full scale field experiment: Äspö Pillar Stability Experiment was conducted at a depth of 450 m in sparsely fractured granitic rock to examine the rock mass response between two deposition holes. An oval shaped tunnel was excavated parallel to the σ3 direction to provide access to the experiment and also provide elevated stress magnitudes in the floor. In the tunnel floor two 1.75-m diameter 6-m deep boreholes were ex

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13

Nabinejad, Omid. "Mechanical Performance and Thermal Stability of Natural Fiber Composite Using Palm Oil Biomass." Thesis, Ph.D, 2017. http://hdl.handle.net/20.500.11937/57464.

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This Thesis demonstrates an experimental study on the development of thermoset-based natural fiber particle-reinforced composite. The overall objective was to improve the mechanical properties and investigate the thermal stability of the composite. It addresses, the effect of various chemical treatment of filler types, filler size, filler percentage and matrix type on the mechanical properties and thermal stability of the composite. To improve the mechanical performance, a hybrid composite containing carbon nanotubes was also synthesized.

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14

Forsén, Rikard. "Mechanical properties and thermal stability of reactive arc evaporated Ti-Cr-Al-N coatings." Licentiate thesis, Linköpings universitet, Nanostrukturerade material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-79579.

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This licentiate thesis reports experimental and theoretical work on the high temperature mechanical properties and the thermal stability of cubic (c)-(Ti-Cr-Al)1-N1 coatings. It is demonstrated that it is possible to tailor and improve the properties of hard nitride coatings by different degrees of multicomponent alloying. When Cr is added to Ti-Al-N the coatings exhibit age hardening up to 1000 ºC which is higher compared to what is observed for Ti-Al-N. In addition, the coatings show a less pronounced hardness decrease when hexagonal (h)-Al-N is formed compared to Ti-Al-N. The improved therm

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15

COSTA, MARCELO EDUARDO HUGUENIN MAIA DA. "STRUCTURAL, MECHANICAL, TRIBOLOGICAL PROPERTIES AND THERMAL STABILITY OF FLUORINATED AMORPHOUS CARBON FILMS DEPOSITED BY PECVD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6376@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Neste trabalho são apresentados os efeitos nas propriedades mecânicas, estruturais e tribológicas da incorporação de flúor em filmes de carbono amorfo hidrogenados depositados por Deposição na Fase Vapor Assistido por Plasma . A estabilidade térmica de filmes de carbono amorfo fluorados também foi estudada. Os filmes foram depositados a partir de uma mistura dos gases C2H2 e CF4 com uma tensão de autopolarização de - 350V. A mistura de gases da deposição foi variada de uma concentração de 0% até 90% de CF4. A estabilida

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16

Li, Hongqi. "Fabrication, thermal stability and mechanical characterization of electrodeposited nanocrystalline face center cubic ni-fe alloys." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004405.

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17

Pieterse, Jacobus Erasmus. "CFD investigation of the atmospheric boundary layer under different thermal stability conditions." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80024.

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Thesis (MScEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: An accurate description of the atmospheric boundary layer (ABL) is a prerequisite for computational fluid dynamic (CFD) wind studies. This includes taking into account the thermal stability of the atmosphere, which can be stable, neutral or unstable, depending on the nature of the surface fluxes of momentum and heat. The diurnal variation between stable and unstable conditions in the Namib Desert interdune was measured and quantified using the wind velocity and temperature profiles that describe the thermally stratified

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18

Fu, Yao-Tsung. "Molecular Simulation of Dipsersion and Mechanical Stability of Organically Modified Layered Silicates in Polymer Matrices." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1296182515.

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19

Shah, Rakesh K. "Enhancements of Mechanical, Thermal Stability, and Tribological Properties by Addition of Functionalized Reduced Graphene Oxide in Epoxy." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699889/.

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The effects of octadecylamine-functionalized reduced graphene oxide (FRGO) on the frictional and wear properties of diglycidylether of bisphenol-A (DGEBA) epoxy are studied using a pin-on-disk tribometer. It was observed that the addition of FRGO significantly improves the tribological, mechanical, and thermal properties of epoxy matrix. Graphene oxide (GO) was functionalized with octadecylamine (ODA), and then reduction of oxygen-containing functional groups was carried out using hydrazine monohydrate. The Raman and x-ray photoelectron spectroscopy studies confirm significant reduction in oxy

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20

Ku, Nai-Yuan. "Thermal Stability of Zr-Si-N Nanocomposite Hard Thin Films." Thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58622.

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<p>Mechanical property and thermal stability of Zr-Si-N films of varying silicon contents deposited on Al<sub>2</sub>O<sub>3</sub> (0001) substrates are characterized. All films provided for characterization were deposited by reactive DC magnetron sputter deposition technique from elemental Zr and Si targets in a N<sub>2</sub>/Ar plasma at 800 <sup>o</sup>C. The hardness and microstructures of the as deposited films and post-annealed films up to 1100 <sup>o</sup>C are evaluated by means of nanoindentation, X-ray diffractometry and transmission electron microscopy. The Zr-Si-N films with 9.4 at

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21

Mortazavi, Bohayra, Obaidur Rahaman, Arezoo Dianat, and Timon Rabczuk. "Mechanical responses of borophene sheets: a first-principles study." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36420.

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Recent experimental advances for the fabrication of various borophene sheets introduced new structures with a wide range of applications. Borophene is the boron atom analogue of graphene. Borophene exhibits various structural polymorphs all of which are metallic. In this work, we employed first-principles density functional theory calculations to investigate the mechanical properties of five different single-layer borophene sheets. In particular, we analyzed the effect of the loading direction and point vacancy on the mechanical response of borophene. Moreover, we compared the thermal stabilit

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22

Essen, M. C. "Capacitive MEMS-based sensors thermo-mechanical stability and charge trapping /." Enschede : University of Twente [Host], 2009. http://doc.utwente.nl/60461.

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23

Kim, Sun K. S. B. Massachusetts Institute of Technology. "Validating surface evolution modeling on high temperature selective emitters : an investigation of the thermal stability of nano-scale surface structures for thermophotovoltaic systems." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69515.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, June 2011.<br>"June 2011." Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 51-52).<br>As the world's traditional energy sources come under scrutiny due to dwindling supply and negative environmental impact, a global effort is being made into alternative energy systems. One such system involves the use of thermophotovoltaics (TPV), which convert thermal energy to electricity. Nano-patterned features can im prove electromagnetic emission from the TPV emitter, increasing system

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24

West, Zachary John. "Studies of Jet Fuel Autoxidation Chemistry: Catalytic Hydroperoxide Decomposition & High Heat Flux Effects." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1322764905.

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25

Eegunjobi, Adetatayo Samuel. "Analysis laminar flow, thermal stability, and entropy generation in porous channel." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1303.

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Thesis submitted in fulfillment of the requirements for the degree Doctor of Technology: Mechanical Engineering Cape Peninsula University of Technology, 2013<br>Fluid flow through a porous channel and cylindrical pipe walls are important area of research due to its wide applications in transpiration cooling, gaseous diffusion technology, cooling of rocket, mechanized irrigation and filtration processes. It is therefore necessary to examine the effect of Navier slip, combined effects of buoyancy forces and variable viscosity on the entire flow structure. Analyzing the magneto- hydrodynamics (MH

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26

Chen, Guizhong. "A study of wellbore stability in shales including poroelastic, chemical, and thermal effects." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3025005.

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27

Mohseni, Hamidreza Materials Science &amp Engineering Faculty of Science UNSW. "Microstructural development and thermal stability of aluminium-based composites processed by severe plastic deformation." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/26793.

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Equal channel angular pressing ECAP is a process whereby simple shear is applied to a billet during multiple passages through an angled channel of constant cross section. The process is capable of generating very large plastic strains that significantly refines the microstructure without altering the external dimensions of the billet. A number of properties are influenced by grain refinement with the generation of a submicron grain structure SMG by ECAP resulting in improved strength and hardness and enhanced superplasticity. In this thesis, both an AA7075 alloy and AA7075 Al-base metal matrix

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28

Gargarella, Piter [Verfasser], Jürgen [Akademischer Betreuer] Eckert, and Filho Walter J. [Akademischer Betreuer] Botta. "Phase formation, thermal stability and mechanical behaviour of TiCu-based alloys / Piter Gargarella. Gutachter: Jürgen Eckert ; Walter J. Botta Filho. Betreuer: Jürgen Eckert." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://d-nb.info/1068445270/34.

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29

Baldwin, Dan, Andrew Szentgyorgyi, Stuart Barnes, et al. "Advanced structural design for precision radial velocity instruments." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622418.

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The GMT-Consortium Large Earth Finder (G-CLEF) is an echelle spectrograph with precision radial velocity (PRV) capability that will be a first light instrument for the Giant Magellan Telescope (GMT). G-CLEF has a PRV precision goal of 40 cm/sec (10 cm/s for multiple measurements) to enable detection of Earth-like exoplanets in the habitable zones of sun-like stars'. This precision is a primary driver of G-CLEF's structural design. Extreme stability is necessary to minimize image motions at the CCD detectors. Minute changes in temperature, pressure, and acceleration environments cause structura

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30

Ali, Fahad. "Mechanical milling of Al-Cu-Fe quasicrystals and their Reinforcement in Aluminum matrix composites." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-85895.

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In this thesis, the effect of mechanical deformation on structure, thermal stability and hardness of a single-phase spray-deposited quasicrystalline alloy with composition Al62.5Cu25Fe12.5 has been investigated in detail. The purpose of the investigation was to study the effect of mechanical milling at different milling speeds (which approximately scale with the milling intensity) on mechanically-induced phase transformations during milling and on the phase evolution during subsequent heating. The results of the milling experiments indicate that, irrespective of the milling speeds used, mechan

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31

Harzer, Tristan Philipp [Verfasser], Gerhard [Gutachter] Dehm, and Alfred [Gutachter] Ludwig. "Nanostructure, thermal stability and mechanical properties of vapor phase deposited supersaturated Cu-Cr thin film alloys / Tristan Philipp Harzer. Gutachter: Gerhard Dehm ; Alfred Ludwig." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1102525103/34.

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32

Ganji, Mahdi. "Mathematical Modeling and Stability Analysis of a Vacuum Gap Clamped-Clamped Micro-Beam For Thermo-Tunneling Application." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/556836.

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Combined thermionic emission and tunneling of hot electrons (thermo-tunneling) has emerged as a potential new solid state cooling technology. Practical implementation of thermotunneling, however, requires the formation of a nanometer-sized gap spanning macroscopically significant surfaces. Thermotunneling is a term used to describe combined emission of hot electrons (thermionic emission) and tunneling of electrons through a narrow potential barrier between two surfaces (field emission). Thermo-tunneling of hot electrons across a few nanometer gap has application to vacuum electronics, at panel

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33

Štěpánek, Roman. "Studium substrukturních změn ultrajemnozrnných Mg-slitin při cyklickém zatěžování a teplotní expozici." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-263403.

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This thesis deals with complex analysis of fine-grained magnesium alloy AZ91 prepared by ECAP process. Mechanical properties of investigated alloy in different states at various external conditions are compared. The structure of this material is inherently unstable therefore changes on microstructural and sub-microstructural level occur during thermal exposure and/or mechanical loading. These changes are analysed and quantified for investigated alloy in selected states in this thesis.

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34

Klipfel, Florian. "Formulation, mise en oeuvre et caractérisation de gants élastomères à caractère radioprotecteur et antimicrobien." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC201.

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Cette étude porte sur l’apport de nouvelles fonctionnalités à des matériaux élastomères qui seront utilisés pour la réalisation de gants. Des additifs possédant des propriétés antimicrobiennes ainsi que des charges possédant des propriétés radioprotectrices sont insérées dans des matrices polymères. La méthode de mise en œuvre utilisée est l’enduction par trempage, l’impact de ces additifs sur les propriétés rhéologiques de solutions dans lesquelles les élastomères sont dissous sont analysées. L’incorporation de certaines amines peut entraîner une vulcanisation des élastomères en solution. Apr

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35

Sim, Kyu-Ho. "Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1575.

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36

Lantz, Jonas. "Heat Transfer Correlations Between a Heated Surface and Liquid & Superfluid Helium : For Better Understanding of the Thermal Stability of the Superconducting Dipole Magnets in the LHC at CERN." Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10124.

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<p>This thesis is a study of the heat transfer correlations between a wire and liquid helium cooled to either 1.9 or 4.3 K. The wire resembles a part of a superconducting magnet used in the Large Hadron Collider (LHC) particle accelerator currently being built at CERN. The magnets are cooled to 1.9 K and using helium as a coolant is very efficient, especially at extremely low temperatures since it then becomes a superfluid with an apparent infinite thermal conductivity. The cooling of the magnet is very important, since the superconducting wires need to be thermally stable.</p><p>Thermal stabi

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Abdallah, Wissam. "Preparation And Characterization Of Thermally Stable Organoclays And Their Use In Polymer Based Nanocomposites." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612278/index.pdf.

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The present study was aimed at exploring the purification and modification of montmorillonite rich Turkish bentonites by organic salts and their subsequent effects on the morphology (X-diffractometry, transmission electron microscopy, scanning electron microscopy), melt flow index, mechanical (Tensile, Impact) and especially thermal stability (thermal gravimetric analysis, differential scanning calorimetry) properties of polymer/organoclay nanocomposites with and without an elastomeric compatibilizer. The bentonite clay mined from Resadiye (Tokat/Turkey) was purified by sedimentation, resultin

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Darvish, Shadi. "Thermodynamic Investigation of La0.8Sr0.2MnO3±δ Cathode, including the Prediction of Defect Chemistry, Electrical Conductivity and Thermo-Mechanical Properties". FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3653.

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Fundamental thermodynamic investigations have been carried out regarding the phase equilibria of La0.8Sr0.2MnO3±δ (LSM), a cathode of a solid oxide fuel cell (SOFC), utilizing the CALculation of PHAse Diagram (CALPHAD) approach. The assessed thermodynamic databases developed for LSM perovskite in contact with YSZ fluorite and the other species have been discussed. The application of computational thermodynamics to the cathode is comprehensively explained in detail, including the defect chemistry analysis as well as the quantitative Brouwer diagrams, electronic conductivity, cathode/electrolyte

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Sander, Zachary Hugo. "Heat Transfer, Fluid Dynamics, and Autoxidation Studies in the Jet Fuel Thermal Oxidation Tester (JFTOT)." University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355367856.

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Ren, Zhe. "Intrinsic Properties of "Case" and Potential Biomedical Applications." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1554409704895456.

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41

Tahan, Yves. "Élaboration de nouvelles phases céramiques légères (phosphure de bore) pour applications structurales et étude de leur stabilité thermodynamique." Electronic Thesis or Diss., Limoges, 2025. http://www.theses.fr/2025LIMO0014.

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Les travaux de cette thèse sont centrés sur l’étude du système Bore-Phosphore, avec deux axes principaux : i) approfondir la compréhension de la stabilité thermique des phases BP et B12P2, notamment la décomposition thermique de la phase BP, et ii) élaborer par la méthode SPS des échantillons denses pour des applications spécifiques, notamment la protection balistique. La première étape implique la caractérisation de poudres submicroniques de BP et de B12P2, obtenues par deux voies de synthèse : la synthèse autopropagée (SHS) et la mécanosynthèse. L’étude de la stabilité thermique de la phase

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42

Martinez, Mathieu. "Nouvelles membranes conductrices protoniques à l’état anhydre." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0173.

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Au cours de cette étude, nous nous sommes intéressés à l’influence de l’acide (sa force, sa structure, sa taille, sa nature, etc. ) et de l’ajout d’eau sur les caractéristiques des CLIPs. Nous avons pu démontrer que la stabilité thermique dépend fortement de la basicité et de la nature de l’anion (Td > 300°C). Les conductivités sont plutôt influencées par la structure et la taille de l’anion, les meilleures conductivités étant obtenues pour des anions de super acide de petite taille. Pour ce qui est des membranes, celles à base de Nafion® ont démontré une très bonne conduction protonique ma

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Luo, Huan. "Study of the plasma phenomenon in HiPIMS discharge. : Application to the reactive deposition of tantalum and hafnium carbide nanocomposite coatings and characterization of their physicochemical, structural, mechanical and oxidation resistance propertie." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCA010.

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La technologie de pulvérisation magnétron par impulsions de haute puissance (HiPIMS) a été développée et est considérée comme une méthode efficace pour la préparation des films. La technologie HiPIMS permet une bien plus grande flexibilité pour ajuster la structure et les performances du film, conduisant à des films avec des propriétés uniques qui sont souvent irréalisables dans les autres approches PVD. Cependant, le mécanisme sous-jacent du plasma pour soutenir la croissance du film impliqué est actuellement flou. De plus, la technologie HiPIMS est limitée au laboratoire, de nombreux films a

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Wolff, Lars, and Klaus Kroy. "Mechanical stability." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-190323.

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The glassy wormlike chain model is a highly successful phenomenological model recently introduced to describe anomalously slow subdiffusive dynamics in biopolymer networks and living cells. Here we extend this model by proposing a generic scheme how to include nonlinear plastic effects by introducing the possibility of force-dependent opening and closing of internal bonds. Further, we discuss physiological implications of this bond kinetics. Stability arguments lead us to the postulation of a “physiological sheet” in the parameter space. This sheet defines the set of parameters characterizing

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Rosa, Avital Gabriel de Almeida. "Comportamento tribológico dos compósitos poliméricos utilizados no anel de atrito do amortecedor torcional de discos de embreagem." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/9273.

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Submitted by Avital Rosa (avitalgabriel@hotmail.com) on 2018-01-23T16:54:36Z No. of bitstreams: 2 Dissertação de Mestrado_PPGCM _Aluno Avital Gabriel de Almeida Rosa.pdf: 5418816 bytes, checksum: f6f7f278fa5c0f54a96a91c4b6a87ad0 (MD5) Carta comprovante da versão final - Avital.png: 3621222 bytes, checksum: 7228740ac2bf0d70ebaad75deb22b89d (MD5)<br>Approved for entry into archive by Milena Rubi ( ri.bso@ufscar.br) on 2018-01-23T17:13:20Z (GMT) No. of bitstreams: 2 Dissertação de Mestrado_PPGCM _Aluno Avital Gabriel de Almeida Rosa.pdf: 5418816 bytes, checksum: f6f7f278fa5c0f54a96a91c4b6a87a

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Signoret, Christian. "Réseaux polyuréthannes classiques et contenant des motifs furanniques pour le confinement de déchets radioactifs : relations structure-propriétés." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0088.

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Etude des proprietes mecaniques, de la stabilite thermique de la diffusion de l'eau et de sels radioactifs dans des polyurethannes. Les polyetherurethannes souples ont un comportement moyen a la temperature et a la diffusion. Les polyesterurethannes ont un meilleur comportement mais sont hydrolyses rapidement les polyetherurethannes rigides (tv=20 a 40#oc) sont le meilleur compromis; amelioration de la tenue en temperature vers 350-500#oc par addition de derives furanniques

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Luecke, Katherine J. Bell Leonard N. "Thermal stability of Tagatose." Auburn, Ala, 2009. http://hdl.handle.net/10415/1770.

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Jalilian, Mohammadali. "Impact of MXD6 on the Structure and Properties of Mechanically Recycled PET Blends." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1513354154142392.

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Zaher, Ghenwa. "Microstructure et comportement mécanique du cuivre et d'un alliage Cu-Sn nanostructurés par déformation plastique intense et implantés à l'azote." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR031/document.

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Les alliages de cuivre sont utilisés dans de nombreuses applications électriques car ils offrent un bon compromis de résistance mécanique, de résistance à la corrosion et de conductivité électrique. Cependant pour certaines applications comme les contacteurs électriques, des matériaux plus performants sont recherchés. L’affinement de la taille de grains et l’implantation ionique sont deux voies que nous avons explorées dans ce but. Afin d’obtenir un bon compromis entre la dureté, la résistance à la corrosion et la conductivité électrique du cuivre pur (99,90%) et un bronze commercial monophasé

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Rashidian, Mahla. "Thermal degradation study by continuous thermal stability rig." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemisk prosessteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22913.

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This investigation was done at NTNU and together with Statoil research and development department in Rotvoll, Trondheim to facilitate a new semi dynamic amine thermal degradation rig.This study was an initial attempt to investigate semi dynamic thermal stability rig as an alternative to thermal degradation study. The major purposes are: (1) to study MEA and MDEA thermal degradation by thermal stability rig apparatus which is designed by Statoil. (2) to demonstrate the result differences between the new and conventional experimental method. MEA and MDEA were selected in this study due to have

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