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Dissertations / Theses on the topic 'Temperature conductivity'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

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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2

Rashidi, Mohammadi Abdolreza. "MEMS pressure, temperature and conductivity sensors for high temperature and harsh environments." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/33783.

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Kraft pulp digesters have been used to convert wood chips into pulp for manufacturing a wide variety of paper products. Inside a kraft digester, chemical reactions remove lignin from their wood matrix in a caustic environment (pH~13.5, 170°C, 2MPa). Data on actual internal operating conditions in a kraft digester is needed to optimize kraft digester operation and obtain maximum production quality. Currently, this information is limited to selected static locations on the periphery of the digester. The objective of this thesis is to develop miniature temperature, pressure, and liquid conductivi

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3

Delap, Martin Richard. "Thermal conductivity studies of YBa₂Cu₃O₇₋δ". Thesis, Durham University, 1990. http://etheses.dur.ac.uk/9301/.

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Apparatus to measure the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) at temperatures between 20K and 120K has been designed and constructed. The thermal conductivity is measured using a longitudinal steady state heat flow technique. Thermal conductivity measurements have been performed upon a sample of YBa(_2)Cu(_3)O(_7-δ) which has been subjected to a series of heat treatments in order to remove oxygen from the material. The measurements show conclusively that the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) is very strongly influenced by the oxygen content of the material. A reduction of th

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4

Hardy, N. D. "The low temperature thermal conductivity of semi-crystalline polymers." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371443.

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5

Mackay, Kenneth Donald. "The low temperature electronic transport properties of amorphous metallic alloys." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386132.

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6

Alonzo-Proulx, Olivier. "Low-temperature thermal conductivity of the amorphous superconductor FexNi₁-xZr₂." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97890.

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Thermal conductivity is a powerful tool to probe the phonon and electron exitations in a solid, especially in superconductors were one can basically tune the respective electronic and phononic contributions by applying a magnetic field below Tc.<br>After a short review on the concepts of superconductivity, thermal conductivity and amorphous matter, we present a study of the thermal conductivity of an exotic material, the amorphous metallic superconductor Fe0.5Ni 0.5Zr2. The results indicate an unexpected dominant electonic contribution to the thermal conductivity across the superconducting tra

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7

Gold, Ziv. "The thermal conductivity of the high temperature superconductor YBa2Cu3O7-delta /." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55497.

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Previous measurements show that the thermal conductivity of $Y Ba sb2 Cu sb3 O sb{7- delta}$ in the basal plane is anisotropic with a large peak in the superconducting state. The magnitude of this anisotropy in the superconducting and normal states, and the dominant mechanism for heat conduction in the superconducting state are currently the subject of debate. We have measured the thermal conductivity of high quality $Y Ba sb2 Cu sb3 O sb{7- delta}$ for deoxygenated, twinned and detwinned samples along the a and b axes to shade light on this issue. We were able to measure the electrical and th

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8

Asgari, Mohammadreza. "FULLY-INTEGRATED CMOS PH, ELECTRICAL CONDUCTIVITY, AND TEMPERATURE SENSING SYSTEM." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533827604228324.

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9

Cole, M. "Structure-conductivity-temperature relationships in calcium and other divalent polymer electrolytes." Thesis, De Montfort University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234266.

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10

Mascaro, Mark Daniel. "Temperature effects on the electronic conductivity of single-walled carbon nanotubes." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/44817.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007.<br>Includes bibliographical references (p. 57-59).<br>The room-temperature electronic conductivity and temperature dependence of conductivity were measured for samples of carbon nanotubes of three types: pristine; functionalized with a nitrobenzene covalent functionalization, which are expected to display poor electronic conductivity; and functionalized with a carbene covalent functionalization, which are expected to display pristine-like conductivity. Measurements were taken via four-point

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11

Wittorff, Vaughan William. "Thermal conductivity of single crystals of yttrium-based high temperature superconductors." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612054.

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12

Ohlendorf, Gerd, Denny Richter, Jan Sauerwald, and Holger Fritze. "High-temperature electrical conductivity and electromechanical properties of stoichiometric lithium niobate." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192902.

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High temperature properties such as electrical conductivity (σ) and resonance behaviour of stoichiometric lithium niobate (LiNbO3) are determined in the temperature range from 20 to 950 °C. The activation energy of the conductivity is found to be 0.9 and 1.7 eV in the temperature range from 500 to 750 °C and from 800 to 950 °C, respectively. During thermal treatments in ambient air up to 950 °C and back, the conductivity remains unchanged at a given temperature, i.e., the crystal is stable under these conditions. The oxygen partial pressure (pO2) dependence of the conductivity shows two disti

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13

Amato, Alessandro. "Temperature dependence of the electrical conductivity in the quark-gluon plasma." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42946.

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14

Ohlendorf, Gerd, Denny Richter, Jan Sauerwald, and Holger Fritze. "High-temperature electrical conductivity and electromechanical properties of stoichiometric lithium niobate." Diffusion fundamentals 8 (2008) 6, S. 1-7, 2008. https://ul.qucosa.de/id/qucosa%3A14152.

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High temperature properties such as electrical conductivity (σ) and resonance behaviour of stoichiometric lithium niobate (LiNbO3) are determined in the temperature range from 20 to 950 °C. The activation energy of the conductivity is found to be 0.9 and 1.7 eV in the temperature range from 500 to 750 °C and from 800 to 950 °C, respectively. During thermal treatments in ambient air up to 950 °C and back, the conductivity remains unchanged at a given temperature, i.e., the crystal is stable under these conditions. The oxygen partial pressure (pO2) dependence of the conductivity shows two disti

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15

Chastin, S. "Low temperature specific heat and thermal conductivity of Kondo intermetallic compounds." Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244320.

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16

Naldi, Matteo. "The effect of the temperature dependency of building insulation conductivity in continental and humid temperate climate." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Constant conductivity values of insulating materials are typically used in building design and assessment. However, the thermal conductivity of insulating materials changes with temperature. Linear temperature-dependent law exist for many inorganic fibrous materials such as fiberglass or rockwool, that exhibit a decreased thermal conductivity (better performance) at low temperatures, and a higher thermal conductivity (weaker performance) at high temperatures. However some insulating materials, especially the petrochemical-foamed insulation such as the polyisocyanurate (PIR), exhibit less regul

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17

Gillespie, Jodie Corbridge. "Measurement of The Temperature Dependence of Radiation Induced Conductivity in Polymeric Dielectrics." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1953.

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This study measures Radiation Induced Conductivity (RIC) in five insulating polymeric materials over temperatures ranging from ~110 K to ~350 K: polyimide (PI or Kapton HNTM and Kapton ETM), polytetraflouroethylene (PTFE or TeflonTM), ethylene-tetraflouroethylene (ETFE or TefzelTM), and Low Density Polyethylene (LDPE). RIC occurs when incident ionizing radiation deposits energy and excites electrons into the conduction band of insulators. Conductivity was measured when a voltage was applied across vacuum-baked, thin film polymer samples in a parallel plate geometry. RIC was calculated as the d

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18

Almajali, Mohammad Rajab. "ENGINEERED CARBON FOAM FOR TEMPERATURE CONTROL APPLICATIONS." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1271365522.

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19

Hort, Matthew C. "Transient natural convection within horizontal cylindrical enclosures." Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313250.

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20

Ghai, Ramandeep Singh. "Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High-Temperature Aero Engines." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/37035.

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Thermal Barrier Coatings (TBC) are used to shield hot sections of gas turbine engines, helping to prevent the melting of metallic surfaces. TBC is a sophisticated layered system that can be divided into top coat, bond coat, and the super-alloy substrate. The highly heterogeneous microstructure of the TBC consists of defects such as pores, voids, and cracks of different sizes, which determine the coating’s final thermal and mechanical properties. The service lives of the coatings are dependent on these parameters. These coatings act as a defensive shield to protect the substrate from oxidation

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21

Pandiman, Dien. "Synthesis and characterisation of novel water-soluble, electrically conducting high temperature polyimides and their precursors." Thesis, University of Huddersfield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363238.

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22

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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23

Kroner, Patrik. "Modeling and Evaluation of Remote Temperature and Conductivity Sensor Using Radio Frequency Identification Tags." Thesis, KTH, Mikrosystemteknik (Bytt namn 20121201), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105541.

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The goal of this master thesis was to model and evaluate a new RFID sensor technology developed at GE research. The sensor uses an ordinary RFID tag to simultaneously sense the temperature and conductivity of a liquid placed on the other side of a plastic membrane. This is accomplished by using a reader antenna and a network analyzer to perform a frequency sweep to calculate the impedance at the different frequencies. Because the resonant circuit properties change with temperature and the conductivity of the liquid the resulting spectrum can be used to calculate the temperature and conductivit

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24

Wakelin, Jonathan Peter. "Low temperature specific heat and thermal conductivity of doped YBa2Cu3O7 and other ceramic superconductors." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284082.

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25

Huang, Xi. "In-situ conductivity, temperature, and dissolved oxygen (CT-DO) sensor system for marine measurement." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/336240/.

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This works describes the development of a miniature high accuracy, low power CT-DO sensor system for in-situ oceanographic measurements. The sensors were fabricated on glass wafers, using micro-fabrication techniques. Three chip designs were made. The sensors in designs 1 and 2 include a seven-electrode conductivity sensor set in a flow channel, a four-ring-electrode open conductivity sensor, a Platinum Resistance Thermometer (PRT) bridge temperature sensor, and a DO sensor based on a platinum electrode inset into five 25 μm deep wells. A 16-bit impedance measurement circuit was made to suppor

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26

Black, Victoria J. "High temperature supercapacitors." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12490.

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The scientific objective of this research program was to determine the feasibility of manufacturing an ionic liquid-based supercapacitor that could operate at temperatures up to 220 °C. A secondary objective was to determine the compatibility of ionic liquids with other cell components (e.g. current collectors) at high temperature and, if required, consider means of mitigating any problems. The industrial motivation for the present work was to develop a supercapacitor capable of working in the harsh environment of deep offshore boreholes. If successful, this technology would allow down-hole te

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27

Kosuga, Atsuko, Yuri Isse, Yifeng Wang, Kunihito Koumoto, and Ryoji Funahashi. "High-temperature thermoelectric properties of Ca0.9−xSrxYb0.1MnO3−delta (0<=x<=0.2)." American Institite of Physics, 2009. http://hdl.handle.net/2237/12623.

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28

Schrama, Judith Marije. "High-frequency magneto-conductivity studies of low-dimensional organic conductors." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365779.

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29

Sarfraz, Sohab. "A high temperature gas flow invariant thermal conductivity sensor developed in SOI CMOS MEMS technology." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708412.

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30

Bonev, Plamen. "Thermal conductivity of mixed oxide fuel (MOX) : effect of temperature, elementary chemical composition, microstructure and burn-up in reactor." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0367.

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Le combustible à oxyde mixte (MOX) est le combustible nucléaire utilisé dans les réacteurs de quatrième génération, également appelés réacteurs à neutrons rapides (RNR). Ces réacteurs fonctionnent à des températures très élevées (entre 1500 et 2500 K). La conductivité thermique est donc une propriété essentielle pour la sécurité des réacteurs. Dans les conditions de fonctionnement des RNRs, le MOX est non seulement soumis à des températures élevées, mais aussi à des modifications locales de la composition élémentaire chimique et de la microstructure, qui peuvent avoir un impact important sur l

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31

Johnston, Martin David. "Current and field distribution in high temperature superconductors." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298870.

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32

Penkala, Bartosz. "Low Temperature Oxygen Mobility Applied to Catalysis." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS022.

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Accomplir les spécifications des nouvelles réglementations concernant les gaz d'échappement de post-traitement des technologies automobiles, par exemple, TWC, implique la disponibilité et l'utilisation de matériaux catalytiquement actifs et notamment des composés tampons d'oxygène, ce qui peut réversible stocker et libérer de grandes quantités de l'oxygène. Oxyde de cérium dopé présente encore aujourd'hui le seul composé de référence pour un support approprié, en raison de sa grande capacité de stockage de l'oxygène et possibilité de créer facilement des lacunes en ions d'oxygène. Cependant, p

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33

Lei, Man I. "Silicon Carbide High Temperature Thermoelectric Flow Sensor." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1283278445.

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34

van, Gelder Maarten F. "A Thermistor Based Method for Measurement of Thermal Conductivity and Thermal Diffusivity of Moist Food Materials at High Temperatures." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30286.

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The purpose of this research was to assess the suitability of the thermistor based method for measuring thermal conductivity and diffusivity of moist food materials at high temperatures. Research focused on aspects of calibration, thermal contact in solid food materials, natural convection in liquid media and the performance in moist food materials at high temperatures. Thermistor probes were constructed in house and calibrated in three materials of known thermal conductivity and diffusivity, water, glycerol, and a heat transfer fluid, HTF 500. With few exceptions, the calibrated probe esti

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35

Alquraini, Zahra. "Highly Conductive Solid Polymer Electrolytes: Poly(ethylene oxide)/LITFSI Blends." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2018. http://digitalcommons.auctr.edu/cauetds/145.

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In this study, highly ionic conductive solid polymer electrolytes have been prepared by blending high molecular weight polyethylene oxide (PEO: MW 35,000 and 100,000) and bis(trifluoromethane)sulfonamide lithium (LiTFSI) salt. The ionic conductivities were determined for several compositions of the blends at different temperatures. A maximum ionic conductivity of 9.45 x 10-6 S cm-1 at 25 °C has been obtained for the blends containing PEO-35,000/LiTFSI at an ethylene oxide to lithium salt ratio (EO/Li+) of 5, whereas a maximum ionic conductivity 7.7 x 10-6 S cm-1 at 25 °C was observed for the P

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36

Morello, Alessandro. "Influence of ph and temperature on metatartaric acid efficiency in white wine tartaric stabilization." Master's thesis, ISA/UL, 2012. http://hdl.handle.net/10400.5/8625.

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Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia<br>The sensitivity of metatartaric acid (MA) to high temperatures is the main limit for its actual use in enology. For this reason MA is generally used only for ready-to-drink wines that are stored for few months in bottle. The objective of this work was to obtain more information about the use of MA in order to prevent tartaric salts precipitation in wine by monitoring its effectiveness along the time. Tartaric stability was followed in a white wine during a ten-week experiment. 10 g/Hl of MA was added to wines with different

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37

Severac, Childerick Henri Louis. "Spin injection into high temperature superconductor." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369295.

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38

Nakayama, Ryo. "Exploration into an Innovative Science of Hydrogen Functional Materials Using Low-temperature Ion Beam Irradiation." Kyoto University, 2019. http://hdl.handle.net/2433/236604.

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39

Wojnar, Alicja Jolanta. "Investigating Riverbed Hydraulic Conductivity at Several Well Fields Along the Great Miami River, Southwest Ohio." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1218131280.

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40

Tomita, Atsuko, Mitsuru Sano, Takashi Hibino, Pilwon Heo, Akihiko Takeuchi, and Masahiro Nagao. "A Proton-Conducting In^3+ -Doped SnP2O7 Electrolyte for Intermediate-Temperature Fuel Cells." The Electrochemical Society, 2006. http://hdl.handle.net/2237/18458.

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41

Chung, Johnny. "Determination of Thermal Conductivity of Wood Exposed to Fire based on Small Scale Laboratory Trials for Finite Element Calculations." Thesis, Luleå tekniska universitet, Byggkonstruktion och brand, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63264.

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This study describes an approach to determine the thermal conductivity of wood at elevated temperatures. The aim is to be able to use the developed conductivity as input in structural elements in finite element calculations. The conductivity of pine wood and glue laminated timber with different densities and moisture contents have been evaluated where small scale one-dimensional laboratory trials have been carried out in a cone calorimeter. Steel temperatures were measured behind the exposed wood samples. Obtained temperatures from the experimental trials have been compared with back calculate

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42

Matsui, Tsuneo, Takanori Nagasaki, Shunsuke Muto, et al. "Thermoelectric properties of Ba3Co2O6(CO3)0.7 containing one-dimensional CoO6 octahedral columns." AIP, 2009. http://hdl.handle.net/2237/20785.

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43

Tomita, Atsuko, Mitsuru Sano, Takashi Hibino, Yousuke Namekata, and Masahiro Nagao. "Intermediate-Temperature NOx Sensor Based on an In^3+ -Doped SnP2O7 Proton Conductor." The Electrochemical Society, 2006. http://hdl.handle.net/2237/18457.

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44

He, Ruixuan. "Studies on Ionic Conductivity and Electrochemical Stability of Plasticized Photopolymerized Polymer Electrolyte Membranes for Solid State Lithium Ion Batteries." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478969519588062.

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45

Wang, Yanfei. "The improvement of thermal and mechanical properties of La2Zr2O7-based pyrochlores as high temperature thermal barrier coatings." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-improvement-of-thermal-and-mechanical-properties-of-la2zr2o7based-pyrochlores-as-high-temperature-thermal-barrier-coatings(2cb87afa-4650-4af4-a159-d1b4f2febb78).html.

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To fully exploit the strengths of La2Zr2O7 pyroclores and promote them as a next-generation thermal barrier coating (TBC), the improvements of their thermally insulating property and fracture toughness are studied in this thesis. A strong phonon scattering source, rattlers, is found in Y3+-doped La2Zr2O7 pyrochlores. Rattlers dramatically flatten k (thermal conductivity)-T curves, or even make k approach the amorphous limit. The presence of rattlers is strongly dependent on (1) oversized atomic cages that are formed in pyrochlores; and (2) the occupation of smaller guest ions in those oversize

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46

Kingsley, Janet Elizabeth. "Using electrical conductivity and temperature mapping to locate zones of groundwater discharge in the South Nation River, eastern Ontario." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27143.

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Groundwater-surface water interactions (GSWI's) interactions are an important part of understanding the hydrological cycle, groundwater and river systems, and in providing estimates of groundwater contributions to rivers (base flow). Seepage/leakage of groundwater into surface waters can be measured directly, but this is very labor-intensive, and therefore not feasible at the scale of a basin. An alternative method, which was used in this study, infers groundwater seepage from electrical conductivity and temperature (EC& T) of water at the bottom of the river, based on the assumption that ther

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47

Bu, Junfu. "Advanced BaZrO3-BaCeO3 Based Proton Conductors Used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs)." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-165073.

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In this thesis, the focus is on studying BaZrO3-BaCeO3 based proton conductors due to that they represent very promising proton conductors to be used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs). Here, dense BaZr0.5Ce0.3Y0.2O3-δ (BZCY532) ceramics were selected as the major studied materials. These ceramics were prepared by different sintering methods and doping strategies. Based on achieved results, the thesis work can simply be divided into the following parts: 1) An improved synthesis method, which included a water-based milling procedure followed by a freeze-drying post-pr

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48

Bracanovic, Darko. "Ac susceptibility and resistivity studies of YBaâ†2Cuâ†3Oâ†7â†-â†#delta# high-temperature superconductors." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302027.

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49

Fuchs, Sven. "Well-log based determination of rock thermal conductivity in the North German Basin." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6780/.

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In sedimentary basins, rock thermal conductivity can vary both laterally and vertically, thus altering the basin’s thermal structure locally and regionally. Knowledge of the thermal conductivity of geological formations and its spatial variations is essential, not only for quantifying basin evolution and hydrocarbon maturation processes, but also for understanding geothermal conditions in a geological setting. In conjunction with the temperature gradient, thermal conductivity represents the basic input parameter for the determination of the heat-flow density; which, in turn, is applied as a ma

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50

Thampan, Tony Mathew. "Design and Development of Higher Temperature Membranes for PEM Fuel Cells." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-dissertations/293.

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Proton-Exchange Membrane (PEM) fuel cells are extremely attractive for replacing internal combustion engines in the next generation of automobiles. However, two major technical challenges remain to be resolved before PEM fuel cells become commercially successful. The first issue is that CO, produced in trace amounts in fuel reformer, severely limits the performance of the conventional platinum-based PEM fuel cell. A possible solution to the CO poisoning is higher temperature operation, as the CO adsorption and oxidation overpotential decrease considerably with increasing temperature. Howev

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