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Tesi sul tema "Conductivity"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Tardieu, Giliane. "Thermal conductivity prediction." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/10014.

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2

Schroeder, Wade Anthony. "Conductivity Sensor Circuit." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1429537491.

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3

Sylvan, Keith. "RF electrolytic conductivity transducers." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11450.

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4

Martin, Ana Isabel. "Hydrate Bearing Sediments-Thermal Conductivity." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6844.

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The thermal properties of hydrate bearing sediments remain poorly studied, in part due to measurement difficulties inside the hydrate stability envelope. In particular, there is a dearth of experimental data on hydrate-bearing sediments, and most available measurements and models correspond to bulk gas hydrates. However, hydrates in nature largely occur in porous media, e.g. sand, silt and clay. The purpose of this research is to determine the thermal properties of hydrate-bearing sediments under laboratory conditions, for a wide range of soils from coarse-grained sand to fine-grained silica f

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5

Mensah-Brown, Henry. "Thermal conductivity of liquid mixtures." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362870.

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6

Peralta, Martinez Maria Vita. "Thermal conductivity of molten metals." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391505.

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7

Jawad, Shadwan Hamid. "Thermal conductivity of polyatomic gases." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367922.

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8

Williams, Oliver Aneurin. "Surface conductivity on hydrogenated diamond." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405246.

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9

Valter, Mikael. "Thermal Conductivity of Uranium Mononitride." Thesis, Linköpings universitet, Tunnfilmsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122337.

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Thermal conductivity is a crucial parameter for nuclear fuel, as it sets an upper limit on reactor operating temperature to have safety margins. Uranium mononitride (UN) is a prospective fuel for fast reactors, for which limited experimental studies have been conducted, compared to the currently dominating light-water reactor fuel, uranium dioxide. The aim of this thesis is to determine the thermal conductivity in UN and to determine its porosity dependence. This was done by manufacturing dense and porous high-purity samples of UN and examining them with laser flash analysis, which with data o

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10

Anderson, Stephen Ashcraft. "The thermal conductivity of intermetallics." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/18185.

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Includes bibliographical references.<br>The thermal conductivity of titanium aluminide and several ruthenium-aluminium alloys has been studied from room temperature up to 500°C. Ruthenium aluminide is a B2-type intermetallic which is unusual and of special interest because of its toughness, specific strength and stiffness, oxidation resistance and low cost. The possible use of ruthenium aluminide in high temperature industrial applications required an investigation of the thermal properties of this compound. Apparatus, capable of measuring thermal conductivity at elevated temperatures has been

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11

Tran, Sam, Niklas Lindborg, Souza Vivedes Danilo De, Johanna Sjölund, Veronica Enblom, and Mattias Sjödin. "Theoretical models of thermal conductivity and the relationship with electrical conductivity for compressed metal powder." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387636.

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This Independent Project reviews literature about the eﬀect of pressure and temperature on thermal conductivity in packed beds and its relationship with electrical conductivity. Exploring the relationships between thermal conductivity, porosity and pressure can give useful knowledge for further improvements in manufacturing processes in the ﬁeld of powder metallurgy. The resulting theoretical models describing the eﬀective thermal conductivity show that gas and contact conductance dominate at lower temperatures and that radiation gains dominance as the temperature increases. Modiﬁcations of th

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12

He, Xiaoyan. "Carbon-rich ruthenium complexes and photochromic units : luminescence and conductivity modulations." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S117.

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Ce travail est consacré à la synthèse et à la caractérisation de commutateurs et de fils moléculaires. La première partie est une étude bibliographique qui présente les avantages et les applications des unités moléculaires utilisées dans le contexte de l’électronique moléculaire. La deuxième partie de ce manuscrit traite de la préparation, des études électrochimiques et photophysiques de complexes de ruthénium bimétalliques portant un coeur triarylamine. Le but est ici de moduler la luminescence de ce cœur en changeant l’état redox des groupements acetylure de ruthénium. Dans la troisième part

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13

Marpaung, Fivman. "Investigation of the effect of gel residue on hydraulic fracture conductivity using dynamic fracture conductivity test." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85866.

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The key to producing gas from tight gas reservoirs is to create a long, highly conductive flow path, via the placement of a hydraulic fracture, to stimulate flow from the reservoir to the wellbore. Viscous fluid is used to transport proppant into the fracture. However, these same viscous fluids need to break to a thin fluid after the treatment is over so that the fracture fluid can be cleaned up. In shallower, lower temperature (less than 250°F) reservoirs, the choice of a fracture fluid is very critical to the success of the treatment. Current hydraulic fracturing methods in unconventional ti

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14

Abidi, Sonia. "Matériaux composites à haute tenue thermique : influence de la micro-nanostructure sur les transferts moléculaires, électroniques et thermiques." Thesis, Toulon, 2014. http://www.theses.fr/2014TOUL0019/document.

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Les matériaux de protection incendie sont largement utilisés pour assurer la sécurité des usagers des infrastructures. Les normes de protection incendie évoluant régulièrement, les matériaux doivent être de plus en plus performants. Ceux-ci sont généralement des mortiers constitués d’oxydes réfractaires et isolants. L’objectif de ce travail est de mettre au point un composite coupe-feu 4 h applicable par projection mais également de déterminer ses propriétés thermiques et mécaniques.Dans une première partie, cette étude reprend les différentes étapes de l’élaboration d’un matériau de protectio

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15

Mutnuri, Bhyrav. "Thermal conductivity characterization of composite materials." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4468.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains vii, 62 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 61-62).

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16

Lukaschewitsch, Michael. "Geoelectrical conductivity problems on unbounded domains." Universität Potsdam, 1998. http://opus.kobv.de/ubp/volltexte/2007/1470/.

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This paper deals with the electrical conductivity problem in geophysics. It is formulated as an elliptic boundary value problem of second order for a large class of bounded and unbounded domains. A special boundary condition, the so called "Complete Electrode Model", is used. Poincaré inequalities are formulated and proved in the context of weighted Sobolev spaces, leading to existence and uniqueness statements for the boundary value problem. In addition, a parameter-to-solution operator arising from the inverse conductivity problem in medicine (EIT) and geophysics is investigated mathematical

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17

Shegelski, Mark Raymond Alphonse. "Hopping conductivity in lightly doped semiconductors." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27529.

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In lightly doped semiconductors (LDSs), electrons can exist in localized states around impurities and dc electronic conduction can occur by electrons hopping between localized states. Such hopping is the dominant mechanism for conduction if the temperature is so low that the contribution from band electrons is negligible. According to theories of hopping conduction, at low enough temperature T, the conductivity σ will be o=σ₀e⁻(T₀/T)¼ where T₀ is a temperature which depends on the material. Experimental work on doped semiconductors which exhibits this form of σ is scarce. Recently, howe

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18

Zaki, Athraa J. "Conductivity studies of single protein molecules." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/95883/.

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A fundamental step for future uses of biomolecules in electronics is the study of the bonding, orientation and conductance of a single molecule attached to a conductive substrate, which is the building block of electronic materials and devices based on molecular conduction. This work provides an in-depth examination of morphology and electrical properties of different molecules anchored to Au(111) and to sustainable carbon materials (graphite and graphene). Cytochrome b562 (Cyt b562), TEM beta-lactamase and the superfolded green uorescent protein engineered with phenyl azide were exposed to UV

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19

Foroozan, Farshad. "Discrete inverse conductivity problems on networks." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3542.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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20

Avala, Usha Kranthi. "Ionic Conductivity in Non-Ionic Compounds." TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1279.

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The main objective of this work is to investigate the ionic conductivity of the drugs under certain conditions and also to compare the ionic conductivities of drugs determined by single surface sensors and parallel plate sensors. The ionic conductivity of various materials at their pre-melt and melt states are studied in order to further study a recently discovered phenomenon. Polar solids like Lidocaine, Ketoconazole, Procainamide and Nifedipine were examined in this study. Experimental studies show an increase in ionic conductivity in both pre-melt (20 -30 °C below melting temperature) and m

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21

Wei, Xiaohao, and 魏晓浩. "Nanofluids: synthesis, characterization and thermal conductivity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44765861.

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22

Jiang, Wei, and 姜为. "Synthesis and thermal conductivity of nanofluids." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45518063.

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23

Ashby, Gwyn Tudor. "Directional vibration conductivity in beam structures." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263393.

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24

Freeman, J. J. "The thermal conductivity of amorphous polymers." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355947.

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25

Olsen, Tyler J. (Tyler John). "Continuum modeling of particle suspension conductivity." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101480.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 91-94).<br>A suspension of network-forming, electrically conductive particles imparts electrical conductivity to an otherwise insulating medium. This effect can be used to great effect in many industrial applications. The ability to describe these networks and to predict their physical properties is a key step in designing systems that rely on these properties. In addition, many times these networks are suspended

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26

Zhang, Yuxi Ph D. Massachusetts Institute of Technology. "Electrospun nanofibers with tunable electrical conductivity." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81690.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 114-117).<br>Electrospinning is a convenient method to produce nanofibers with controlled diameters on the order of tens to hundreds of nanometers. The resulting nonwoven fiber mats are lightweight, highly porous, and have high specific surface areas around 1 to 100 m2/g. Combined with the high electrical conductivity of intrinsically conductive polymers, conductive electrospun fiber mats are promising for a variety of

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27

Square, Lynndle Caroline. "Proton conductivity stability studies by modelling." University of the Western Cape, 2016. http://hdl.handle.net/11394/6121.

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Philosophiae Doctor - PhD (Physics)<br>In this thesis, some of the challenges experienced by high temperature polymer electrolyte membrane fuel cells are explored through material modelling techniques. A very important aspect for a fuel cell is that it should have high proton conductivity. As hydrogen enters a fuel cell it gets broken down into its constituents, protons and electrons. The electrons travel to an external load, whilst the protons travel through a diffusive layer, catalyst layer and membrane area, before recombining with oxygen to form water and leave the system. In this pa

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28

Dudnik, S. F., A. I. Kalinichenko, and V. E. Strel’nitskij. "On Thermal Conductivity of Anisotropic Nanodiamond." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35196.

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Dependence of thermal conductivity of nanocrystalline diamond coating on grain size and form is theoretically investigated. Nanodiamond is considered as two-phase material composed of dielectric diamond grains characterizing by three main dimensions and segregated by thin graphite layers with electron or phonon thermal conductivity. Influence of thermal conductance type and thickness of boundary layer on nanodiamond thermal conductivity is analysed. Derived dependences of thermal conductivity on grain dimensions are compared with experimental data. When you are citing the document, use th

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29

Webber, Christina Marie. "Prosthetic Sockets: Assessment of Thermal Conductivity." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1404224355.

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30

Lanauze, Javier A. "Transient Electrohydrodynamics of Low–Conductivity Drops." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/841.

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31

Beck, Michael Peter. "Thermal conductivity of metal oxide nanofluids." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26488.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Teja, Amyn S.; Committee Member: Abdel-Khalik, Said I.; Committee Member: Meredith, Carson; Committee Member: Nair, Sankar; Committee Member: Skandan, Ganesh. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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32

Jones, Todd J. Tombrello Thomas A. "Radiation-induced conductivity in amorphous carbon /." Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-02022007-131335.

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33

Tlili, Radhouan. "Études des transferts dans les matériaux hétérogènes." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1092.

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L'usage des matériaux composites dans les différents domaines technologiques (microélectronique, aéronautique, transports…) ne cesse de croître. Une telle augmentation vient du fait qu'il est possible de développer de nouveaux matériaux avec des propriétés adaptées à une application bien préc ise en combinant les propriétés physiques des différents constituants. Dans le travail de thèse, nous nous intéressons à l'étude des propriétés thermophysiques, électriques et diélectriques de composites à base de matrice polymère chargée avec des fibres naturelles et/ou de particules minérales. L'objecti

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34

Kim, Yeon Seok. "Electrical conductivity of segregated network polymer nanocomposites." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1880.

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35

Huldén, Pierre. "Conductivity measurement on thick insulating plaque samples." Thesis, KTH, Elektroteknisk teori och konstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150956.

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The conductivity is one of the main properties of HVDC cable insulation materials and needs to be evaluated carefully. Since measurement on cables is time consuming, often thin specimens and normal conductivity measurement cells are used to compare the materials. In this way however, the bulk effects will be less represented in the measurement and the results will be less representative. Instead, one needs to perform the measurements on thick plate samples and with higher voltage levels. This work focuses on the conductivity measurements on thick HVDC insulation plate samples subject to a high

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36

Bihari, Kathleen L. "Analysis of Thermal Conductivity in Composite Adhesives." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010808-130536.

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<p>BIHARI, KATHLEEN LOUISE. Analysis of Thermal Conductivity in Composite Adhesives (Under the direction of H. Thomas Banks). Thermally conductive composite adhesives are desirable in many industrial applications, including computers, microelectronics, machinery and appliances. These composite adhesives are formed when a filler particle of high conductivity is added to a base adhesive. Typically, adhesives are poor thermal conductors. Experimentally only small improvements in the thermal properties of the composite adhesives over the base adhesives have been observed. A thorough understanding

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37

Brandell, Daniel. "Understanding Ionic Conductivity in Crystalline Polymer Electrolytes." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5734.

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38

Kruglova, Olga Viktorovna. "Discotic liquid crystals : from dynamics to conductivity /." Amsterdam : IOS Press, 2007. http://www.loc.gov/catdir/toc/fy0803/2007464234.html.

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39

Kartoatmodjo, Rudjuk Sinung Trijana. "A model for finite conductivity horizontal wellbores /." Access abstract and link to full text, 1994. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9522755.

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40

Ford, Theodore Robert. "Thermal conductivity of bonded hollow-sphere monoliths." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/20045.

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41

Church, Benjamin Cortright. "High conductivity alloys for extruded metallic honeycomb." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/21283.

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42

Wagner, Ingo. "Algebraic approach towards conductivity in ergodic media." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164715.

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This thesis is about an operator algebraic approach towards the derivation of the electrical conductivity in disordered solid states based on the theory of quantum many-particle systems. Such an approach is of interest since it allows for the description of interacting electron gases, which is a feature not present in previous work. In the context of the description of ergodic media, new concepts are introduced, such as covariant states and covariant morphisms. Moreover, the concept of covariant states is combined with the well-known concept of KMS states. In its covariant form, KMS states d

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43

Fisher, Craig Andrew James. "Electrical conductivity of brownmillerite-structured oxide ceramics." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318598.

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44

Russell, Carissa Don. "INTERFACIAL THERMAL CONDUCTIVITY USING MULTIWALL CARBON NANOTUBES." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/30.

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Shrinking volume, coupled with higher performance, microprocessors and integrated circuits have led to serious heat dissipation issues. In an effort to mitigate the excessive amounts of waste heat and ensure electronic survivability, heat sinks and spreaders are incorporated into heat generating device structures. This inevitability creates a thermal pathway through an interface. Thermal interfaces can possess serious thermal resistances for heat conduction. The introduction of a thermal interface material (TIM) can drastically increase the thermal performance of the component. Exceptional the

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45

Regan, Simon Edmund. "The low temperature thermal conductivity of polymers." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277153.

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46

Young, Kevin Edward. "Ionic conductivity in silicate - containing solid electrolytes." Thesis, University of Exeter, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335654.

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47

Tibaldi, Pier Silvio. "Self-Assembly and Electrical Conductivity of Colloids." Thesis, Uppsala universitet, Materialfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-272198.

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Self-assembly is an astonishing phenomenon at the base of organized structures’ formation from disordered systems. It occurs in nature from atomic and molecular lengths to galactic distances. Nowadays self-assembly of colloidal solutions can be used to fabricate photonic crystals and metamaterials. This paper analyses the self-assembly and its effect on the electric conductivity of a colloid made up of carbon nanotubes and magnetite microparticles controlled by electrostatic potentials and magnetic fields. Alignment of the carbon nanotubes and creation of sparks and short-circuits are observed

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48

Gray, David John. "Conductivity studies of selected anionic composite electrolytes." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47453.

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49

Zalaf, M. "The thermal conductivity of electrically-conducting liquids." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47321.

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50

Schulz, Eric Clinton. "Conductivity of proppant mixtures." Thesis, 2014. http://hdl.handle.net/2152/26439.

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Hydraulic fracturing is a physically complex phenomenon, and there are many variables, both environmental and operational, that affect the overall success of a fracture treatment. Amongst the operational variables, the process of proppant selection is key to ensuring that the induced fractures remain open and permeable. A variety of physical mechanisms act to degrade the permeability of a given proppant packing after deposition in a fracture, the most important of which is the magnitude of the confining stress. The goal of this work is to understand how mixtures of unlike proppants behave u

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