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Tesi sul tema "Electric conductivity"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

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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2

Fung, Sing Chor. "Conductivity fluctuations in yttrium barium cooper oxides." HKBU Institutional Repository, 1994. http://repository.hkbu.edu.hk/etd_ra/34.

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3

Li, Haiying. "Study of thermally reworkable epoxy materials and thermal conductivity enhancement using carbon fiber for electronics packaging." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04062004-164718/unrestricted/li%5Fhaiying%5F200312%5Fphd.pdf.

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4

Oh, Tae-il. "Electrical conductivity and related defect structures in reduced rutile." Full text open access at:, 1985. http://content.ohsu.edu/u?/etd,90.

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5

Allen, David Andrew. "Electrical conductivity imaging of aquifers connected to watercourses : a thesis focused on the Murray Darling Basin, Australia." University of Technology, Sydney. Faculty of Science, 2007. http://hdl.handle.net/2100/428.

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Electrical imaging of groundwater that interacts with surface watercourses provides detail on the extent of intervention needed to accurately manage both resources. It is particularly important where one resource is saline or otherwise polluted, where spatial quantification of the interacting resources is critical to water use planning and where losses from surface waterways need to be minimized in order to transport water long distances. Geo-electric arrays or transient electromagnetic devices can be towed along watercourses to image electrical conductivity (EC) at multiple depths within and

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6

Santiago, Claudia. "Resistivity and conductivity studies of the Rattlesnake Springs, New Mexico watershed." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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7

Ray, Nicolas [Verfasser], and Oleg [Gutachter] Pankratov. "Phonon-induced electron scattering and electric conductivity in twisted bilayer graphene / Nicolas Ray ; Gutachter: Oleg Pankratov." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1152078976/34.

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8

Crawford, Charles. "Transverse Thermoelectric Effect." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1866.

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Anisotropic thermoelectric effects can be measured in certain materials. Anisotropy can also be simulated using a repeated, layered structure of two materials cut at an angle. Various aspect ratios and angles of inclination are investigated in device geometry in order to maximize the thermopower. Eddy currents have been shown to occur in thermoelectric devices, and evidence of these currents are revealed in finite element analysis of the artificially synthesized anisotropic Peltier effect.

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9

FIGUEROA, FRANCISCO RAMON. "MONOMERS, POLYMERS AND CHARGE-TRANSFER COMPLEXES OF DITHIAFULVENES AND POLYMERS FROM 4,4'-SULFONYL DIPHENOL (2-BENZYLIDENE, 1,3-DITHIOLES, 1,3-DITHIOLIUM)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183817.

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Monomers, polymers, charge-transfer complexes of 2-benzylidene-1,3-dithioles (Dithiafulvenes), and 1,3-dithiolium (Dithiafulvenium) salts of dithioesters and poly(dithioesters) were synthesized. The infrared, nuclear magnetic resonance (NMR) and ultra violet spectra of these materials were also reported. Condensation polymerization of piperidinium tetrathio terephthalate with α-halocarbonyl compounds using phase-transfer techniques yielded poly(dithioesters) that upon dehydrative cyclization with sulfuric acid gave poly(1,3-dithiafulvenium) salts. Polymerization of substituted dithiafulvenes w

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10

Miller, Darren A. "The ionic conductivity of p(2-hydroxyethyl methacrylate) hydrogels /." Title page, contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phm6483.pdf.

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11

Simpson, Joycelyn Ovetta. "Modeling viscosity and ionic conductivity of epoxy resins using free volume concepts." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/10258.

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12

Richter, Reinhart. "Quantum corrections to the conductivity in simple metallic glasses." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75757.

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The validity of the theories of quantum corrections to the electrical conductivity, namely weak localization and enhanced electron-electron interaction, has been tested quantitatively in well characterized, free-electron-like Mg-Cu and Mg-Zn metallic glasses containing various amounts of Ag and Au through measurement of the electrical resistivity between 1.5K and 20K in magnetic fields up to 5.6T. It is found that the theories give an excellent description of the magnetoresistance at low fields, in both the weak and strong spin-orbit scattering limit but that at higher fields they break down.

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13

Edwards, Thomas Raymond. "Empirical Ionospheric Models: The Road To Conductivity." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100284.

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The Earth's polar ionosphere is a highly dynamic region of the upper atmosphere, and acts as the closure of the greater magnetospheric current system. This region plays host to many electrodynamic effects that impact terrestrial systems, such as power grids, railroads, and pipelines. These effects are fundamentally related to the currents, electric fields, and conductivity present in the polar ionosphere. Understanding and predicting the electrodynamics of this region is vital to being able to determine the physical impacts on terrestrial systems and provide predictions to government and comme

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14

Manna, Tapan K. "Impulse impedance of grounding systems and its effect on tower crossarm voltage : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online version, 2006. http://proquest.umi.com/pqdweb?index=97&did=1208141981&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1256323226&clientId=28564.

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15

Su, Bin. "Electrical, thermomechanical and reliability modeling of electrically conductive adhesives." Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-12192005-124641/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.<br>Qu, Jianmin, Committee Chair ; Baldwin, Daniel, Committee Member ; Wong, C. P., Committee Member ; Sitaraman, Suresh, Committee Member ; Jacob, Karl, Committee Member.

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16

Cao, Jingnan, and 曹靖楠. "Thermoelectric transport properties in nanoscale systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49799708.

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As the fast development of nanotechnology and further industrial applications, theoretical investigations upon nanoscale devices are in urgent need. Until now several formalisms have been well established in quantum transport of mesoscopic areas, including of tight-binding and first principle calculations. In this dissertation those methods were partly explored to explore transport and thermoelectric features in various models and actual devices. The density functional theory plus non-equilibrium Green’s function serves well in the probing process of transport properties like conductance i

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17

Yoon, Im T. (Im Taek). "Anisotropy of conduction electrons in n-InSb and extrinsic and intrinsic properties of HgCdTe." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc332803/.

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The anistropy of the orbital and spin properties of conduction electrons in InSb has been measured simultaneously using a cyclotron-resonance type experiment. This represents the first time that the anistropy of effective mass in InSb has been directly measured using an optical method.

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18

Li, Qi. "Competing orders in s-wave and p-wave superconductors /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2008. http://hdl.handle.net/1794/8285.

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Thesis (Ph. D.)--University of Oregon, 2008.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 107-110). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.

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19

Nartey, Emmanuel Akuffo. "Oil/ Paper Insulation for HVDC: Conductivity of Oil." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13264.

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The work begins with a theoretical description of conductivity and the importance of this material property in the electrical power industry. The various theories describing high voltage conduction in highly insulating dielectric liquids are analysed to ascertain their propensity to explain the exponential rise in the conductivity of the insulating liquid at high fields.The work goes further to analyse the various methods and standards that are presently utilised in the measurement of conductivity of highly insulating oils. The short-comings of the present methods particularly the IEC 61620 an

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20

Su, Bin. "Electrical, thermomechanical and reliability modeling of electrically conductive adhesives." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/10425.

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The first part of the dissertation focuses on understanding and modeling the conduction mechanism of conductive adhesives. The contact resistance is measured between silver rods with different coating materials, and the relationship between tunnel resistivity and contact pressure is obtained based on the experimental results. Three dimensional microstructure models and resistor networks are built to simulate electrical conduction in conductive adhesives. The bulk resistivity of conductive adhesives is calculated from the computer-simulated model. The effects of the geometric properties of fill

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21

Fraser, Iain Stuart. "Electrical conduction in macroscopic carbon nanotube assemblies." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609756.

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22

Ringer, Eric. "The energetis, dynamics and transport properties of CaF₂ : surface superionic conductivity." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/31029.

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23

Whittall, Kenneth Patrick. "Exploring magnetotelluric nonuniqueness using inverse scattering methods." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27563.

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I present two algorithms which solve the one-dimensional magnetotelluric (MT) problem of finding the electrical conductivity σ(z) as a function of depth in the earth. Together, these algorithms restrict and explore the nonuniqueness of the nonlinear MT inverse problem. They accept constraints which limit the space of acceptable conductivity models and they construct diverse classes of σ(z) in order to explore this space. To avoid pitfalls during interpretation, it is essential to investigate the extent of the nonuniqueness permitted by the MT data. Algorithm 1 is a two-stage process based on

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24

Ywata, Ricardo Sussumu [UNESP]. "Caracterização de filmes finos de polímeros entrecruzáveis como camada dielétrica em dispositivos de eletrônica orgânica." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/99691.

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Made available in DSpace on 2014-06-11T19:30:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-11Bitstream added on 2014-06-13T20:40:12Z : No. of bitstreams: 1 ywata_rs_me_bauru.pdf: 1172780 bytes, checksum: 9144da0c9124443e6313263e76ce6fbd (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O objetivo deste trabalho é a caracterização de polímeros isolantes elétricos para seu uso na fabricação de dispositivos eletrônicos orgânicos. Os polímeros estudados foram: a poli(amida-imida), PAI, p

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25

Lu, Daoqiang. "Fundamental understanding of electrically conductive adhesives (ECA's)." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19911.

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26

Laughlin, Paul Jonathan. "The effect of uniaxial orientation upon the structural properties of polvaniline films." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5237/.

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The effects of elongation upon the structural and electronic properties of the conducting polymer polyaniline have been investigated. In particular, the properties of high molecular weight (ca. 150 000 Daltons) polyaniline have been examined, and the effects of increased molecular weight assessed. A method has been found to elongate the emeraldine base (EB) form up to 700% (l/l(_o)=8). This induces partial molecular alignment in the polymer which, upon doping, exhibits electrical conductivity of up to 700 Scm(_-1) and electrical anisotropy of almost 4.The mechanical properties of high molecula

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27

Öztürk, Serdar Balköse Devrim. "Preparation and characterization of metal soap nanofilms/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000379.pdf.

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Thesis (Master)--İzmir Institute of Technology, İzmir, 2005.<br>Keywords: Electrical conductivity, langmuir blodgett technique, metal soaps, nanofilms, moisture adsorption. Includes bibliographical references (leaves. 127-132).

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28

Ruiz, Trejo David Enrique. "A study of conductivity and diffusion in Sr-doped LaYo (209)." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299723.

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29

Song, Yi. "AC conductivity and dielectric constant of systems near the percolation threshold /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu148726754698361.

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30

Lilly, Jonathan Patrick. "One-dimensional computer modeling of electrical conductivity through methane and synthesis gas flames." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4898.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xvi, 291 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 289-291).

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31

VIVALDINI, TULIO C. "Medidas de velocidade de arrastamento de elétrons em gases inibidores de descargas pelo método de townsend pulsado." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10629.

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Made available in DSpace on 2014-10-09T12:42:34Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:01:33Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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32

Bai, Jing. "Percolation study of nano-composite conductivity using Monte Carlo simulation." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002644.

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33

Mülazımoğlu, Mehmet Hașim. "Electrical conductivity studies of cast Al-Si and Al-Si-Mg alloys." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75785.

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Cast Al-Si and Al-Si-Mg alloys containing up to 12.6 wt. pct. silicon and 1.0 wt. pct. magnesium were prepared. The changes in electrical conductivity/resistivity of these alloys due to strontium additions have been investigated and explained in terms of variations in microstructure. The conductivity behaviour of strontium-containing and strontium-free alloys was found to exhibit marked differences, depending on the silicon and magnesium contents and the rate of solidification. The electrical conductivity of single phase alloys containing less than 1.60 wt. pct. Si decreased with increasing si

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34

Wood, Sandra Jean. "Determination of effective thermal conductivity of media surrounding underground transmission cables." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/17390.

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35

Goad, Stephen D. "The theory and design of switched-mode power transformers for minimum conductor loss." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/52290.

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A comprehensive and general analysis of the electromagnetic fields, power dissipation, and energy storage within transformer windings is presented. Emphasis is placed on applications in switched-mode power conversion. One-dimensional radial variation of the field quantities is assumed. The first phase of the investigation is for sinusoidal excitation; solutions for the current density and magnetic field intensity are derived and studied in order to develop a fundamental understanding of the basic phenomena. Expressions for the power dissipation and energy storage in both single- and

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36

Nuttall, Kevin. "The on-line determination of underground cable conductor temperatures." Thesis, Queensland University of Technology, 1986. https://eprints.qut.edu.au/36458/1/36458_Nuttall_1986.pdf.

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The criterion determining the maximum load able to be sustained by an underground cable is its maximum allowable conductor temperature. Above this value, degradation of insulation will commence and lead to ultimate failure of the cable. Methods using a digital computer program are available for calculating cable conductor temperature given the thermal characteristics of the cable and its environment and the loads at whlch the cable will be operated. Such methods invariably assume a 24 hourly load cycle to which the cable is subjected continuously and a maximum ground ambient temperatu

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37

BATISTA, RAFAEL M. "Efeitos da adicao do NiO na densificacao, na microestrutura e na condutividade eletrica da zirconia totalmente estabilizada com itria." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9499.

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38

Milošević, Borka. "On voltage stability monitoring and control using multiagent systems." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16355.

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39

Tipirneni, Raja Ram. "Characterization of thermal and electrical properties of fiber reinforced polymer (FRP) composites." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5932.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains xii, 117 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 116-117).

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40

Daniels-Hafer, Carrie Lynn. "Electrochemical tuning of charge transport at inorganic semiconductor doped conjugated polymer interfaces through manipulation of electrochemical potential /." view abstract or download file of text, 2004.

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Thesis (Ph. D.)--University of Oregon, 2004.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 185-196). Also available for download via the World Wide Web; free to University of Oregon users.

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41

Yamaguchi, T., T. Matsuoka, and S. Koda. "A theoretical study on the frequency-dependent electric conductivity of electrolyte solutions. II. Effect of hydrodynamic interaction." American Institite of Physics, 2009. http://hdl.handle.net/2237/12627.

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42

Emelyanenko, Artyom. "Measurements and interpretation of lateral electromagnetic waves on the surface of low conductivity media." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/393637.

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Measurements of electromagnetic fields are used for a wide range of applications. Often such measurements provide a non-destructive and non-intrusive way of obtaining information about the internal structure and other properties of the medium. Observations may be conducted across a very broad frequency range. Depending on the application domain, the frequency bands may range from the UHF band in biomedical engineering to the ULF band in geophysics. This thesis reports on several experiments where the electric and magnetic fields were measured on the surface of different media for the purpose o

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43

Blood, Arabella M. "A study of the electrical properties of defects in silicon." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298320.

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44

TADOKORO, SANDRA K. "Obtencao e caracterizacao de ceramicas de ceria com dupla dopagem." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11243.

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45

Eriksson, Björn. "In-line application of electric fields in capillary separation systems." Doctoral thesis, Karlstad University, Division for Chemistry, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1197.

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<p>The magnitude of an electric field possible to apply in a capillary separation system is limited, because a high electric field causes a too high current through the capillary. Application of the electric field <i>in-line</i> will give an increased conductivity in the column, further increasing the risk of too high currents. The conductivity changes were found to result from an overall increase in ionic strength within the electric field. The increase in ionic strength is caused by the increase in mobile phase ions with electrophoretic velocity against the flow, together with OH<sup>-</sup>

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46

Watkins, Bobby Gene II. "Materials selection and evaluation of Cu-W particulate composites for extreme electrical contacts." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39494.

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Materials for extreme electrical contacts need to have high electrical conductivity coupled with good structural properties. Potential applications include motor contacts, high power switches, and the components of electromagnetic launch (EML) systems. In particular, the lack of durability of these materials in rail components limits practical EML implementation. These rails experience significant amounts of Joule heating, due to extreme current densities, and subsequent thermally-assisted wear. New more durable materials solutions are needed for these components. A systematic materials select

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47

VIVALDINI, TULIO C. "Medidas de velocidade de arrastamento de eletrons no isobutano puro." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9525.

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48

Ywata, Ricardo Sussumu. "Caracterização de filmes finos de polímeros entrecruzáveis como camada dielétrica em dispositivos de eletrônica orgânica /." Presidente Prudente : [s.n.], 2012. http://hdl.handle.net/11449/99691.

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Orientador: José Alberto Giacometti<br>Banca: Antonio José Felix de Carvalho<br>Banca: Nilson Cristino da Cruz<br>Resumo: O objetivo deste trabalho é a caracterização de polímeros isolantes elétricos para seu uso na fabricação de dispositivos eletrônicos orgânicos. Os polímeros estudados foram: a poli(amida-imida), PAI, poli(fenil-metilsilsesquioxano), PSQ, e o fotoresiste SU8. O processo de fabricação dos filmes poliméricos foi realizado pela técnica de spin-coating e eles foram submetidos a um processo de cura apropriado para o entrecruzamento das cadeias poliméricas. Os filmes foram caracte

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Leuenberger, Georg H. W. "Electrostatic density measurements in green-state P/M parts." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0429103-125812/.

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Thesis (Ph. D.)--Worcester Polytechnic Institute.<br>Keywords: green-state P/M parts; inverse algorithm; conductivity-density relationship; nondestructive testing. Includes bibliographical references (p. 142-148).

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50

Khan, Saima N. "Electrospinning Polymer Nanofibers-Electrical and Optical Characterization." Ohio : Ohio University, 2007. http://www.ohiolink.edu/etd/view.cgi?ohiou1200600595.

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