Dissertations / Theses: 'Electric wires'

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Wells, M. Glenn. "Transient temperature distributions in overhead fiber-optic ground wires." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16885.

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O'Connor, Louis J. "Electromagnetic coupling of grounded wires on an anisotropic, polarizable, layered earth." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/558118.

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Evans, John Lee. "Corona discharge and arcing around wires under the influence of high electric fields." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52118/.

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An Electromagnetic Pulse (EMP) resulting from, for example, the detonation of a nuclear weapon is characterised by a wave of electromagnetic activity able to couple with power lines and electro-sensitive equipment with the potential of rendering an establishment or on a greater scale, a whole city impotent. Protection against such occurrences is of paramount importance. It is now accepted that an important consideration when devising protective schemes against such phenomena is an accurate understanding of the effects on propagating waveforms such as those coupled to wires, when electrical breakdown of the dielectric material surrounding such wires occurs, otherwise known as electrical discharge. Such issues can occur around the affected wires if the electric fields generated exceed the dielectric strength of the surrounding medium, typically air or soil. Under these circumstances, the signature of the coupled waveform is known to change in characteristic ways. The form and degree of distortion needs to be understood if the harmful effects are to be prevented by protection systems put in place. The purpose of this thesis is to first describe the mechanisms that lead to the development of the Nuclear–Electromagnetic Pulse (NEMP) and the mechanisms of the discharge that can result once such pulses have coupled to a wire. Next, some of the previous corona-modelling approaches are discussed. Many of the modelling approaches have been applied to 1-D transmission-line simulations. When 3-D simulations have been performed, the Finite-Difference (Time Domain) or FD-TD approach seems to be the preferred method. At the time of writing, no 3-D Transmission Line simulations of discharge phenomena around wires were available. Hence, here, the 3-D Transmission Line Modelling Method (TLM) is described with a view to modelling such behaviour. In particular, the Embedded-Wire-Node (EWN) is used to model the discharge development around the wire. This is a fine-wire technique used to reduce computational fatigue. The node can be adapted to accept changes related to electrical discharge allowing for a real-time, self-consistent recreation of such effects. The 3-D TLM approach proves to be a decent candidate to the modelling of such behaviour. Both advantages and disadvantages of this method are discussed.

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Mani, Ashwini. "Study of partial discharge activity in magnet wires aged by combined stresses." Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/etd/show.asp?etd=etd-11072005-171152.

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Burns, Angela D. "Comparison of two electrofishing gears (backpack and parallel wires) and abundances of fishes of the upper Greenbrier River drainage." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5165.

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Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains vii, 65 p. : ill., maps (part col.). Includes abstract. Includes bibliographical references.

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Bandaru, Sreekanth. "Effect of high frequency pulse voltages and high temperature on the lifetime characteristics of magnet wires." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-05132004-135217.

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Pitrun, Miroslav. "The effect of welding parameters on levels of diffusible hydrogen in weld metal deposited using gas shielded rutile flux cored wires." Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050202.153920/index.html.

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FERNANDES, MARCOS G. "Obtanção de fios em ligas cobre-magnésio para utilização em linhas de transmissão de energia elétrica." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10030.

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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

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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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Sarvari, Reza. "Impact of size effects and anomalous skin effect on metallic wires as GSI interconnects." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31636.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Meindl, James D.; Committee Member: Davis, Jeffrey A.; Committee Member: Gaylord, Thomas K.; Committee Member: Hess, Dennis W.; Committee Member: Peterson, Andrew F. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Vares, João Vinícius de Souza. "Estudo dos efeitos do método de produção em aciaria nas propriedades mecânicas de produtos trefilados a partir de aço semelhante ao SAE 1045." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/152743.

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O mercado siderúrgico vive um momento de grande competição e as empresas produtoras necessitam, cada vez mais, atuar internamente sobre seus custos para garantir lucratividade e rentabilidade. A motivação deste trabalho foi a redução de custos de produção de arames de aço para o setor agropecuário, por meio de estudo de viabilidade técnica do emprego de aço ao carbono produzido via aciaria elétrica, em lugar de aço produzido via aciaria a oxigênio – atualmente utilizado em algumas usinas siderúrgicas. As qualidades de aços estudadas são produzidas através de aciaria elétrica, dando origem aos tarugos que são laminados a quente para obtenção do fio-máquina que segue para os processos posteriores de trefilação e galvanização, em que se obtém os arames de aço. As composições químicas propostas neste trabalho devem garantir que as especificações de propriedades mecânicas permaneçam sendo atendidas. Foram realizados levantamento e análise de histórico de dados, análises de composição química, caracterização microestrutural, ensaios de tração e de enrolamento. Fundamentado nos resultados atingidos, mostra-se que a metodologia proposta para avaliação de propriedades mecânicas é válida. O presente estudo aponta também que é viável tecnicamente o emprego de aço ao carbono semelhante ao SAE1045, obtido via aciaria elétrica, na produção de arames de aço galvanizados para o setor agropecuário, mantendo o atendimento a todas as especificações e com possibilidade de redução de custos de produção.
The steel market is experiencing a period of great competition and manufacturing companies need, increasingly, to act internally on their costs to ensure lucrativeness and profitability. The motivation of this work was to reduce the cost of production of steel wires for the agriculture sector, by studying the technical feasibility use of a carbon steel produced by electric arc furnace, replacing the oxygen furnace steel – currently used in some mills. The studied steels are manufactured in an electric arc furnace, giving rise to the billets that are hot rolled to obtain the wire rod to follow the subsequent process of drawing and galvanizing, where the wires of steel are made. The chemical compositions proposed in this paper must guarantee that the mechanical properties described in the technical standards continue be met. Data, chemical composition, microstructure, tensile strength and winding properties were surveyed and analyzed. Based upon the results achieved, it is shown that the proposed method for assessment of the mechanical properties is valid. This study also indicates that it is technically feasible the use of carbon steel similar to SAE1045, obtained by electric arc furnace, to manufacturing galvanized steel wires for the agriculture sector maintaining compliance to all technical standards and with the possibility of reducing costs.

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Zhou, Yitong Zhou. "Mechanical Characterization of Automotive Electrical Wires and Wire Harnesses." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469016576.

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INVERNIZZI, BRUNO P. "Soldagem circunferencial do aço inoxidável super duplex UNS S32750 pelo processo MIG com controle CMT®." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28014.

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Neste trabalho foram realizados experimentos de soldagem circunferencial em tubos de aço inoxidável super duplex UNS S32750, com diâmetros de 19,05 mm e 48,20 mm. Foram executadas soldas utilizando-se diversos parâmetros de soldagem num equipamento MIG com controle CMT® Cold Metal Transfer. Os cordões de solda foram avaliados por inspeção visual e dimensional, além dos ensaios de tração e microdureza Vickers, bem como a análise microestrutural em conjunto com análise de precipitação de fases, a qual foi realizada em acordo com a prática A da norma ASTM A923, e ensaio de corrosão conforme a prática A da norma ASTM G48 em conjunto com a norma ASTM A923. Os resultados indicaram que a soldagem do tubo com diâmetro de 19,05 mm apresentou cordão de solda com dimensões inaceitáveis conforme norma, tendo sido esta condição atribuída a utilização de um elevado diâmetro do arame para as condições (parâmetros) usadas de soldagem. A soldagem do tubo com diâmetro de 48,20 mm apresentou falta de penetração nas condições empregadas, quando soldado pelo processo CMT® convencional. No caso da utilização do CMT® combinado com arco pulsado, em condições que geraram maior aporte de calor durante a soldagem, assim obteve-se penetração total da junta e acabamento superficial adequado. Os resultados indicaram que a soldagem utilizando o processo CMT® combinado com arco pulsado, nas condições (parâmetros) empregados geraram bom acabamento superficial, aliado propriedades mecânicas compatíveis, atendendo exigências de normas, bem como uma microestrutura balanceada e alta resistência à corrosão.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

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MEDEIROS, Maria Thalita Siqueira de. "Investigação dos efeitos radiolíticos no poli (etileno-coacetato de vinila) (EVA)." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/19066.

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FACEPE
O Poli (etileno-co-acetato de vinila), EVA, é um copolímero da família das olefinas. É obtido por meio da polimerização em cadeia via radical livre, usualmente utilizando oxigênio e/ ou peróxidos orgânicos para a geração de radicais iniciadores da polimerização do etileno e do acetato de vinila, à alta temperatura e pressão. Seu uso varia de acordo com o teor de acetato de vinila na sua composição e entre suas utilidades estão o seu uso na composição de embalagens plásticas flexíveis para alimentos irradiados e revestimento para cabos elétricos. Diante disso, é importante analisar os efeitos causados pela radiação gama nestas embalagens e nos revestimentos destes cabos. Neste trabalho, a investigação dos efeitos da irradiação gama no EVA foi dividida em duas partes: a primeira para doses mais baixas, entre 5 e 30kGy, utilizadas na irradiação de alimentos e radioesterilização de artefatos médicos, utilizando filmes de EVA com 25% e 40% de acetato de vinila em sua composição. E a segunda para doses mais altas, (doses de 250 -1000kGy), nas quais os cabos elétricos utilizados em usinas nucleares são expostos, utilizando o EVA a 12%, 25% e 40% em formato de pellets. Para a primeira parte foram preparados 12 filmes de EVA a 25% e 18 filmes de EVA a 40% pelo método casting film sendo, para o EVA a 40% foram preparados três filmes para cada doses: 5kGy, 10kGy, 15kGy, 20kGy e 30kGy. Para o EVA a 25% foram preparados 3 filmes para cada dose: 10kGy, 20kGy e 30kGy. Os três filmes restantes, de cada amostra sem irradiação, foram separados para serem amostras de referência. Nos ensaios de viscosidade foi observado que a massa molar viscosimétrica média aumentou para todas as amostras, tanto do EVA a 25% quanto do EVA a 40%, evidenciando a predominância do efeito de reticulação das macromoléculas. As propriedades de degradação térmica e de índice de refração não sofreram mudanças significativas após a irradiação. Na análise de molhabilidade, o ângulo de contato apresentou ligeiro decréscimo no EVA a 40% para a dose de 20kGy. Na análise de FT-IR o pico de absorção atribuído ao grupo metileno sofreu modificações marcantes decorrente da radiólise no copolímero para o EVA a 40% e para o EVA a 25% houve mudanças em todos os picos. Para a segunda parte, as amostras em pellets foram irradiadas a 250kGy, 500kGy e 1000kGy. Foram analisadas as propriedades de degradação térmica em atmosferas diferentes e foram observadas mudanças significativas quando as amostras foram expostas à atmosfera de oxigênio. Para as análises de FT-IR foram observadas poucas modificações nos picos para todas as amostras. Os resultados mostraram que é mais favorável o uso do EVA como uma camada intermediária na composição de embalagens de alimentos por conta da sua boa propriedade de barreira. E para o uso do EVA em revestimento de cabos elétricos é interessante incorporar ao polímero produtos que aumentem sua resistência à degradação térmica e a radiação.
Poly (ethylene-co-vinyl acetate), EVA, is a copolymer of olefins family. It is obtained by chain polymerization by free radical, usually using oxygen and/or organic peroxides to generate radical initiators of ethylene polymerization and vinyl acetate, under high temperature and pressure. Its use varies depending on the vinyl acetate content in its composition and among its utilities are the use in composition of flexible plastic packaging for irradiated foods and coating for electrical cables. Therefore, it is important to analyze the gamma radiation effects in these packages. In this study, the investigation of gamma irradiation effects on EVA was divided into two parts: the first one for lower doses between 5 and 30kGy, used in food irradiation and medical devices radiosterilization, using EVA films with 25% and 40% of vinyl acetate in its composition. And the second to highest dose (dose between 250 - 1000kGy), in which the electric cables used in nuclear power plants are exposed, using EVA with 12%, 25% and 40% in pellet form. For the first part were prepared 12 EVA films at 25% and 18 EVA films at 40% by casting film method, being for EVA of 40% prepared three films for each dose: 5kGy, 10kGy, 15kGy, 20 kGy and 30kGy. For the EVA at 25% were prepared three films for each dose: 10 kGy, 20 kGy and 30kGy. The remaining three films of each sample without irradiation were separated for reference samples. In viscosity experiments it was observed that average viscosimetric molecular weight increased for all samples, EVA at 25% and 40%, indicating the predominance of macromolecule reticulation effect. The properties of thermal degradation and refractive index did not change significantly after irradiation. At the wettability analysis, the contact angle showed slight decrease in EVA to 40% at the dose of 20 kGy. In the FT-IR analysis, the absorption peak assigned to methylene group undergoes remarkable changes resulting from copolymer radiolysis for EVA at 40%; for EVA at 25% were no changes at all peaks. For the second part, the pellets samples were irradiated with 250kGy, and 500kGy 1000kGy. The thermal degradation properties were examined in different atmosphere and significant changes were observed when the samples were exposed to an oxygen atmosphere. For the FTIR analyzes were observed few changes in peak for all samples. The results showed that it is more favorable to use EVA as an intermediate layer in the composition of food packaging because of their good barrier property. And the use of EVA in electrical cable sheathing is interesting to incorporate into the product polymer to increase its resistance to thermal degradation and radiation.

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Ersoy, Mehmet Okan. "Application Of A Natural-resonance Based Feature Extraction Technique To Small-scale Aircraft Modeled By Conducting Wires For Electromagnetic Target Classification." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605522/index.pdf.

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The problem studied in this thesis, is the classification of the small-scale aircraft targets by using a natural resonance based electromagnetic feature extraction technique. The aircraft targets are modeled by perfectly conducting, thin wire structures. The electromagnetic back-scattered data used in the classification process, are numerically generated for five aircraft models. A contemporary signal processing tool, the Wigner-Ville distribution is employed in this study in addition to using the principal components analysis technique to extract target features mainly from late-time target responses. The Wigner-Ville distribution (WD) is applied to the electromagnetic back-scattered responses from different aspects. Then, feature vectors are extracted from suitably chosen late-time portions of the WD outputs, which include natural resonance related v information, for every target and aspect to decrease aspect dependency. The database of the classifier is constructed by the feature vectors extracted at only a few reference aspects. Principal components analysis is also used to fuse the feature vectors and/or late-time aircraft responses extracted from reference aspects of a given target into a single characteristic feature vector of that target to further reduce aspect dependency. Consequently, an almost aspect independent classifier is designed for small-scale aircraft targets reaching high correct classification rate.

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Diebold, Aaron. "Electrowetting actuation of liquid metal wires for reconfigurable electronic switches and wire-grid polarizers." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1459437829.

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Chen, T. M. "Electron-electron interactions in GaAs quantum wires." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597526.

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The first experiment presents a novel method for continuously tracking the energies of the 1D subbands as a function of carrier density. I show a peculiar dc conductance feature in the region where the so-called 0.85(2e²/h) plateau in differential conductance is observed, directly demonstrating the pinning effect of the energy level of the minority spin-up electrons. A model concerning providing for non-linear population of the 1D subband with dc bias is proposed to explain the unusual differential conductance value of the 0.85(2e²/h) plateau. The second experiment shows that a fully spin-polarised current, consisting of a single spin-type only, can be created without external magnetic fields. When a source-drain bias lifts the momentum degeneracy, the dc measurements show that it is possible to achieve a unidirectional transport with a ferromagnetic order and this ordered spin array is destroyed once transport in both directions commences. The degree of spin polarisation of currents, between full spin polarisation, partial spin polarisation, and spin degeneracy, is thus simply controlled by source-drain bias and split-gate voltage, something of considerable value for spintronics. I then present four odd-even spin phenomena in the third experiment, showing clear evidence that a quasi-one-dimensional system tends to spontaneous spin polarisation with the energy band of minority spin-up electrons being reluctant to populate, thus widening the energy gap between two spin types. Variation of g-factor within a single subband is measured using a dc conductance technique, showing the g-factor oscillates as the 1D subbands are filled one by one with increasing carrier density. The last experiment introduces new experimental data of the zero-bias anomaly (ZBA), showing clear evidence that the ZBA observed in quantum wires in fact has a different origin from the Kondo effect seen in quantum dots. I propose a phenomenological model wherein the zero-bias anomaly in 1D quantum wires is in fact attributed to a upward shift of the 1D subband energy with source-drain bias.

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Coulbois, Alain. "Etude de la transition préarc-arc dans les éléments fusibles." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22584/document.

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Le mécanisme de la transition préarc-arc dans les éléments de coupure du type fusible est encore mal connu à ce jour. La compréhension du phénomène requiert encore de nombreuses données fondamentales tels que la température ou la densité des vapeurs métalliques créées. Des hypothèses sont avancées pour expliquer la différence du temps de préarc prévue par les modélisations effectuées au sein du LAEPT avec celui constaté lors des expérimentations menées dans ce même laboratoire. Cet ouvrage tente de les vérifier par une approche expérimentale menées sur des fils explosés et des rubans fusibles. L’étude expérimentale est complétée par une recherche bibliographique sur les fils explosés. Ce complément propose de nouvelles pistes d’investigation pour la compréhension de l’amorçage de l’arc électrique sur les rubans fusibles. Enfin, toutes les méthodes de diagnostic et les grandeurs obtenues dans les tests les plus représentatifs sont données en fin d’ouvrage
Transition between prearcing and arcing stage remains not well known. Several fundamental data are needed as temperature or density of metalic vapour created to better understand the phenomenon. Hypothesis are mentioned to explain the difference of prearc time between modelisations and experiences that have been made in LAEPT. This study try to verificate them among experiences made on exploding wire and fuses ribbon. Experimental study is completed by a bibliographic review on exploding wires. This review permits to show other lines of investigation to understand the transition between prearcing and arcing stage on fuses ribbon. Finally, all the methods of diagnostic and the results obtained with the most representative tests are given at the end of the thesis

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Emberly, Eldon. "Electron transport in molecular wires." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ51858.pdf.

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Hoffmann, James A. "Electron transport in interacting quantum wires." Virtual Press, 2003. http://liblink.bsu.edu/uhtbin/catkey/1259758.

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Nanoscale wires and molecules have remarkable electrical properties that make them well suited for new electronic devices. The projected device densities result in very small separation distances and therefore the possibility of device-device interactions. However, we do not know what impacts wire-wire interactions might have on the properties of closely spaced devices. If two quantum wires interact, what types of effects will there be on transport properties such as conductance? How would the coupling strength, length of wire, position of contact, or the energy of the electrons affect conductance? Understanding the effects of the interactions will assist the construction of efficient nanoscale devices.This thesis examined the effects of interaction on the low-field conductance using a simple classical model and two quantum models of coupled quantum wires fabricated electrostatically in the two-dimensional electron gas at the interface of the heterostructure A1GaAs/GaAs. We considered the effect of position and length of an interaction between two parallel quantum wires formed by hard wall boundaries and connected to electron reservoirs. Our second model consisted of two artificial molecular wires, i.e., parallel chains of quantum dots. We used a one-electron Schrodinger equation in the envelope approximation, a tight-binding Hamiltonian, and a recursive Green's function method to study the electron transport properties. Multi-parameter computations using a fortran-95 computer model provided data for an analysis of the relationships among conductance, the interaction strength, interaction location, and electron energy.In contrast to the monotonic changes predicted by the classical model, the lowfield conductance of interacting hard wall quantum wires varies in an oscillatory manner with the perturbing interaction strength and position. For electron energies below the first conductance plateau, Breit-Wigner resonances appear as a consequence of coupling. These conductance properties are explained with reference to quasi-bound states created by reflections at the end boundaries of the wires and the separating wall.At low electron energies, the conductance signature of a symmetric artificial molecule composed of serial quantum dots is a band of resonances. Coupled artificial molecular wires display a split-off molecular band with an energy separation that grows with the coupling strength and a bandwidth that narrows. The position of the Fermi energy relative to the molecular band states plays a dominant role in determining the lowfield conductance of interacting artificial molecules. The conductance variation with coupling ranges from oscillatory to monotonic, depending on the Fermi energy. Varying the atom-atom coupling position in the molecular wires causes a relatively small shift in the resonance band energies.
Department of Physics and Astronomy

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Hrachiar, Róbert. "Porovnání klasického AlFe vedení s technologiemi ACCC." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377144.

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The diploma thesis deals with the comparison of the conduction with the classic "AlFe" ropes (ACSR technology - aluminium conductor steel reinforced) and the line with the ACCC technology (aluminum core composite core). The first part describes the development of the transmission and distribution network in the Czech Republic. Subsequently types of conductors are described, its construction and main characteristics. The theoretical part also consists of theoretical knowledge about compared types of conductors and knowledge from the field of external lines. During the creation of the theoretical part of the thesis, we gained experience in the advanced functions of Excel, which are later used in practical part. The practical part of the thesis consists of creation of the calculation program itself, instructions and calculation methodology. Included is also an example of use of the program that compars two types of conductors of the same diameter, the same transmitted current and the same weight per unit length.

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Kaufman, David Kaufman David. "Electron transport in V-groove quantum wires /." [S.l.] : [s.n.], 2000. http://library.epfl.ch/theses/?nr=2239.

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Fechner, Andrea. "Frequency dependent electronic transport in quantum wires." [S.l. : s.n.], 2000. http://www.sub.uni-hamburg.de/disse/318/thesis.pdf.

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Montgomery, M. J. "Ineleastic electron-phonon interactions in atomic wires." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411758.

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Smith, Richard Andrew. "Single electron charging in nanoscale silicon wires." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624967.

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Li, Yu. "Electron Transport in Ferrocenes Linked by Molecular Wires." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16198.

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A large variety of diferrocenyl compounds bridged by an organic wire fragment in a generic form of -CH=CH-X-CH=CH- were first synthesized, in which the X unit is a functional group/atom. These compounds were studied by structural analysis, electrochemistry, intervalence NIR absorption and other spectroscopic techniques. The results indicated that metal-ligand redox matching is most essential in facilitating long-range electron transfer in the mixed-valence complexes. A series of doubly-bridged diferrocenyl compounds and wire-linked triferrocenes were also synthesized and studied. All doubly-bridged diferrocenyl compounds demonstrated nearly doubled electronic coupling in comparison to their singly-bridged analogues. Thus the use of parallel wires in such systems represents a facile approach to improve communication in molecular electronics. For triferrocenes linked by symmetric wires, the electronic interaction between the redox-active centers was rather dynamic when the bridging component was short or the charge was delocalized among the ligand and metal centers. For triferrocenes bridged by asymmetric wires, depending on the direction of the polar linking chain, the central ferrocene becomes a molecular switch, turning on or off the communication between the two end ferrocenes. Finally, to eliminate the metal-ligand orbital mixing problem, we also bound the wires with two redox-active styrylpyrrole termini, for which the molecules are purely organic. It was found that when the ð-conjugation was maintained, the oligomers were fully delocalized systems.

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Rostron, Sarah. "Electron-exchange processes in long molecular scale wires." Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423592.

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Sfigakis, François. "Electron transport in etched GaAs/AlGaAs quantum wires." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/284060.

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Taank, R. K. "An evaluation of TCP over wired-to-wireless networks." Thesis, Aston University, 2008. http://publications.aston.ac.uk/15393/.

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To exploit the popularity of TCP as still the dominant sender and protocol of choice for transporting data reliably across the heterogeneous Internet, this thesis explores end-to-end performance issues and behaviours of TCP senders when transferring data to wireless end-users. The theme throughout is on end-users located specifically within 802.11 WLANs at the edges of the Internet, a largely untapped area of work. To exploit the interests of researchers wanting to study the performance of TCP accurately over heterogeneous conditions, this thesis proposes a flexible wired-to-wireless experimental testbed that better reflects conditions in the real-world. To exploit the transparent functionalities between TCP in the wired domain and the IEEE 802.11 WLAN protocols, this thesis proposes a more accurate methodology for gauging the transmission and error characteristics of real-world 802.11 WLANs. It also aims to correlate any findings with the functionality of fixed TCP senders. To exploit the popularity of Linux as a popular operating system for many of the Internet’s data servers, this thesis studies and evaluates various sender-side TCP congestion control implementations within the recent Linux v2.6. A selection of the implementations are put under systematic testing using real-world wired-to-wireless conditions in order to screen and present a viable candidate/s for further development and usage in the modern-day heterogeneous Internet. Overall, this thesis comprises a set of systematic evaluations of TCP senders over 802.11 WLANs, incorporating measurements in the form of simulations, emulations, and through the use of a real-world-like experimental testbed. The goal of the work is to ensure that all aspects concerned are comprehensively investigated in order to establish rules that can help to decide under which circumstances the deployment of TCP is optimal i.e. a set of paradigms for advancing the state-of-the-art in data transport across the Internet.

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30

Edler, Frederik [Verfasser]. "Electronic transport in quasi-1D atomic wires / Frederik Edler." Hannover : Gottfried Wilhelm Leibniz Universität, 2018. http://d-nb.info/1158670583/34.

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31

Blaikie, Richard John. "Electron transport in quantum wires confined by implanted gates." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240901.

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32

Pfaendler, Sieglinde Marie-Louise. "Fabrication, microscopy, and electrical conductance of ridge quantum wires." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612295.

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Smith, Luke William. "Electron interaction effects in quasi-one-dimensional quantum wires." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610185.

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34

Ghanem, Tarek Khairy. "Electronic transport in low dimensions [electronic resource] : carbon nanotubes and mesoscopic silver wires." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8841.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Physics. 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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35

Decker, Jason John. "Orientation and spatial correlation of wire resistance fluctuations in still air." Diss., Online access via UMI:, 2007.

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36

Evert, Abraham. "Electrical transport, filtering and NMR of GaAs/AlGaAs quantum wires." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121557.

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The study of electrons in low dimensions is a field which has yielded incredible insights in the past decades from the Fractional Quantum Hall Effect to Wigner Crystallization. In recent years, interest has grown from studying the fundamental physics of two dimensional conductors to engineering experimental new states using nanotechnology techniques. We now have the capability to create high quality one and zero dimensional devices, that is, quantum wires and quantum dots. At very low temperatures, quantum physics dominates the behavior of these devices causing new properties to emerge, due to enhanced electron-electron interactions, spin-orbit interactions and many other effects. These new properties are the result of the interaction of ensembles of quantum particles and cannot be understood by classical intuition. Not only are there exciting new physics to be discovered at low dimensions, but there are promising applications on the horizon.Electrons constrained to one dimension are predicted to enter a state known as the Luttinger liquid. While there exists strong evidence for the observation of the Luttinger liquid already, it is still an area of highly active study. Furthermore, it has been predicted that interactions between helically ordered nuclear spins in GaAs and a Luttinger liquid state could results in a nuclear spin feedback effect which would result in distinct experimental observations. Not only would this state provide clear evidence of Luttinger liquid behavior, but it has potential to support sought-after Majorana fermions which have applications in quantum information processing.This project consisted of the fabrication of GaAs/AlGaAs quantum wires samples in collaboration with Sandia National Laboratories with varying parameters such as length and well-depth. We then performed detailed electronic transport measurements at low temperature to identify promising quantum wire samples. Good samples were cooled further to 300 mK where some quantization of conductance was observed. It was determined that to reach lower electronic temperatures, filtering was required. To this end, low temperature filtered samples holders were designed, constructed and characterized. The filtered sample holders resulted in superior observations to unfiltered samples, likely reflecting a lower electron temperature. Using our best sample with filters, we then performed resistively-detected nuclear magnetic resonance experiments, probing the interaction between the electrons and the nuclear spins in quantum wires. While the predicted state was not observed, the groundwork for such an experiment is complete and its expected that a sufficiently high quality sample will display the signature behavior with current methodology.
L'étude des électrons dans de faibles dimensions est un domaine qui a donné un aperçu incroyable dans les dernières décennies du Effet Hall quantique fractionnaire de Wigner cristallisation . Au cours des dernières années, l'intérêt s'est développé à partir de l'étude de la physique fondamentale des deux conducteurs dimensions à l'ingénierie expérimentale nouveaux Etats à l'aide de techniques de la nanotechnologie . Nous avons maintenant la possibilité de créer de haute qualité et un zéro dispositifs dimensions , c'est- fils quantiques et boîtes quantiques . A des températures très basses , la physique quantique domine le comportement de ces dispositifs provoquant de nouvelles propriétés émergent , en raison des interactions entre électrons améliorées , les interactions spin-orbite et de nombreux autres effets. Ces nouvelles propriétés sont le résultat de l'interaction des ensembles de particules quantiques et ne peuvent être compris par intuition classique. Non seulement la nouvelle physique y passionnants à découvrir à basse dimensions , mais il ya des applications prometteuses à l'horizon.Les électrons contraints à une dimension sont prévus pour entrer dans un état connu comme le liquide de Luttinger . Bien qu'il existe des preuves solides pour l'observation du liquide de Luttinger déjà , il est encore un domaine d'étude très active. En outre, il a été prévu que les interactions entre les spins nucléaires hélice commandés en GaAs et un état liquide de Luttinger pourraient se traduit par un effet de rétroaction des spins nucléaires qui se traduiraient par des observations expérimentales distinctes. Non seulement cet état de fournir des preuves claires de comportement de type liquide de Luttinger , mais il a le potentiel pour soutenir convoités fermions de Majorana qui ont des applications dans le traitement de l'information quantique. Ce projet consistait en la fabrication de GaAs / AlGaAs quantum fils échantillons en collaboration avec Sandia National Laboratories avec des paramètres tels que la longueur et le bien- profondeur variable. Nous avons ensuite effectué des mesures détaillées de transport électronique à basse température pour identifier les échantillons de fils quantiques prometteurs. Bonne échantillons ont été refroidis à la suite de 300 mK où on a observé une certaine quantification de la conductance . Il a été déterminé que, pour atteindre des températures inférieures électroniques , le filtrage est nécessaire. À cette fin , à basse température filtrées porte-échantillons ont été conçus, construits et caractérisé. Les porte-échantillons filtrés ont donné lieu à des observations supérieures aux échantillons non filtrés , ce qui reflète probablement une température d'électrons inférieure. Grâce à notre meilleur échantillon de filtres , puis nous avons effectué des expériences de résonance magnétique nucléaire résistivement - détectés , sonder l'interaction entre les électrons et les spins nucléaires dans les fils quantiques. Alors que l'état prédit n'a pas été observée , les bases d' une telle expérience est complète et sa s'attend à ce qu'un échantillon suffisamment haute qualité affichera le comportement de signature avec la méthodologie actuelle .

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37

Bittner, Wendy Belliston Bercaw John E. "Ultrafast photoreduction of nitric oxide synthase by electron tunneling wires /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05192005-234308.

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38

Stratford, Kevin. "Electronic transport in one- and quasi-one-dimensional quantum wires." Thesis, University of Leicester, 1993. http://hdl.handle.net/2381/35801.

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The aim of this work is to investigate some of the properties of one- and two-dimensional systems, in particular, those concerned with electrical conduction. In the quantum mechanical regime such systems have exhibited a range of interesting and potentially useful characteristics. The Landauer-Buttiker formalism has shown that the quantity which determines the resistance in mesoscopic systems is the quantum-mechanical transmission. For a strictly one-dimensional system the transmission is easily evaluated for different arrays of model potentials. Results show that the resistance increases exponentially with length as the system becomes long. For shorter systems the degree of localisation of electronic states is investigated. A time-dependent approach is adopted to calculate the transmission in the case of quasi-one-dimensional quantum wires. This requires a modification of the simple (zero temperature) Landauer conductance formula to accommodate a wave packet of finite width in momentum space. The method developed is fast, efficient and is easily adapted to study quantum wires of differing geometry, an important factor when transport is ballistic. The effect of the finite width of the wave packet is investigated. The time-dependent approach is also extended to model the Coulomb repulsion between electrons; this is applied to electron tunnelling through a quantum dot. In addition, a suitable propagation scheme for the conductance calculation allows the inclusion of a magnetic field. The effect of a transverse field on point contact conductance is considered. As a further example, the question of transport in a model lateral surface superlattice potential is addressed. Again, the finite width of the wave packet is important.

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39

Ng, Vivian. "Electron transport in ultrathin wires of recrystallised hydrogenated amorphous silicon." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627269.

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40

Wang, Zijing. "Materials evaluation of high temperature electrical wires for aerospace applications." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/materials-evaluation-of-high-temperature-electrical-wires-for-aerospace-applications(cdf36522-a2fe-4faa-82aa-405ec030c175).html.

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The electrical resistivities of typical AWG20-Class3 and AWG18-Class27 Ni-coated Cu wires were monitored at 400 ºC for times up to 5500 hours; the resistivities increased by 6.9% and 2.3%, respectively. Microstructural analysis of the thermally aged wires revealed evidence of Ni-Cu interdiffusion. Diffusion experiments were performed on Ni-Cu metal foils in the range 400 to 600 ºC; Ni-Cu compositional profiles across the Ni-Cu interface were collected by energy dispersive X-ray spectrometry. Ni-Cu interdiffusivities determined by the Boltzmann-Matano method were typically 2.5×10-17 m2s-1;calculated activation energies for Ni-Cu interdiffusion were between 79.4 and 89.8 kJ•mol-1. Analysis of the available Ni-Cu interdiffusion data suggested a dependence on grain size of the Cu foils used. A concentric-circle, diffusion-resistivity model was developed. Using the experimentally determined Ni-Cu interdiffusion data, it was possible to accurately predict the resistivity of a Ni-coated Cu wire at 400 ºC as a function of time. It is predicted that the resistivity of the AWG20-Class3 wire would increase by 10% after annealing for 48,000 hours at 400 ºC; in contrast, heating an AWG18-Class27 wire for a much longer time of 140,000 hours would incur the same increase in its resistivity. Low temperature co-fired ceramics (LTCC) with a formulation of 11ZnO-10MoO3 (NSZM) were prepared with additions of 0.5 to 2.0 wt% B2O3 via the mixed oxide route. The NSZM samples were sintered at 850-950ºC to over 96% of theoretical density with co-existence of both ZnMoO4 and Zn3Mo2O9 phases. With increasing the addition of B2O3 to NSZM the relative permittivity, dielectric strength and thermal conductivity increased. NSZM prepared with 1.0 wt% B2O3 exhibited a relative permittivity of 11.1, dielectric strength of 17.6 kV•mm-1, linear thermal expansion of 4.7 ppm•K-1and thermal conductivity of 1.3 W•m-1•K-1. The LTCC material is a possible candidate for insulating applications because of its low dielectric constant and adequate dielectric strength. LTCC insulation films were applied to Ni disc substrates by dip coating; the suspensions contained 5 to 20 vol% NSZM ceramic powders, 1.0 wt% B2O3, a polyvinyl butyral (PVB) based binder system, plus solvents and organic additives. A microstructural study of the LTCC films revealed that the insulation thickness varied from 4.3 to 47.3 µm with the ceramic content of starting suspension. The dielectric strength of these films was in the range 24.2 to 43.7 kV•mm-1. These results showed that dip coating is a promising method for applying the LTCC insulation to Ni-based metal substrates. LTCC-insulated wires were manufactured by withdrawing Ni-coated Cu conductors from the suspension, containing 15 vol% ceramic powders, followed by co-firing at 500 ºC. The LTCC-coated wire exhibited an insulation thickness of 40.3 µm and a breakdown voltage of 798 V. These results suggest that the LTCC-coated wire is a possible candidate for use in high temperature machine windings.

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41

Stallard, William George. "Optical investigations of laterally confined two-dimensional electron gases." Thesis, University of Exeter, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244412.

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42

Chen, Ing-Yi. "Synthesis of VLSI sea-of-wires arrays." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/186020.

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The primary intent of this dissertation project has been to assess the potential of a unique CMOS design capability, which is derived from a methodology known as Sea-of-Wires Arrays (SWA). The new capability is expected to yield the performance benefits of a custom design while maintaining the quick turnaround and ease of semicustom design for ASIC applications. The specific goal of this research is to develop the design representations, design techniques, and computer software for the SWA design methodology. This includes the design and analysis of heuristic algorithms for every issue related to synthesis, logic minimization and layout optimization with respect to both delay and chip area. The research begins by showing that the SWA architecture based on distributed gates is a promising approach to VLSI design. The synthesis and optimization algorithms form the core of the design system whose goal is high-performance SWA design. The innovative table lookup timing analysis approach facilitates a fast and accurate performance evaluation. Numerous programs have been written to constitute the performance-driven SWA synthesis system that maps the input RIF (RTL Intermediate Format) specification onto the output SLF (Symbolic Layout Format) layout with satisfaction of constraints dictated by technology, design flow, and manufacturability. This is based on a well-designed Data Modeler which specifies both RIF and SLF design representations. The present results, obtained from a number of benchmark designs, indicate that the research goals have been fulfilled. Fast turn-around time and a density advantage make the SWA approach a potentially important player in the commercial market. However, the research project presented here is not yet the final solution. The ultimate goal of future research is to achieve an SWA chip layout that compares favorably with manual design of the same architecture.

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Dash, Louise Karenza. "Electron-electron interactions and correlations in atomic scale wires : Luttinger liquids and their spectral signatures." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269623.

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Narayan, Vinay. "The electronic and optical properties of low dimensional structures." Thesis, University of Exeter, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361318.

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Lam, Chi Seng. "An adaptive low dc-voltage controlled LC coupling hybrid active power filter in three-phase four-wire power systems." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2580608.

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Stier, Oliver [Verfasser]. "Electronic and optical properties of quantum dots and wires / Oliver Stier." Berlin : Wiss.-und-Technik-Verl, 2001. http://d-nb.info/975250280/34.

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Potts, Adrian. "Electronic and thermal transport in free-standing silicon and GaAs wires." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357880.

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Dahl, Matthew Lyle. "An implementation of the virtual wires interconnect scheme." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11539.

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Han, Ki Jin. "Electromagnetic modeling of interconnections in three-dimensional integration." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29642.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Madhavan Swaminathan; Committee Member: Andrew E. Peterson; Committee Member: Emmanouil M. Tentzeris; Committee Member: Hao-Min Zhou; Committee Member: Saibal Mukhopadhyay. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Mathur, Kovid. "Conversion of a Hybrid Electric Vehicle to Drive by Wire Status." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1291147552.

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Dissertations / Theses on the topic 'Electric wires'

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