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Dissertations / Theses on the topic 'Electrical discharge in gases'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Diaz, Oscar. "Numerical modelling of positive electrical discharges in long air gaps." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298355.

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This dissertation deals with research on the numerical modelling of electrical discharges in laboratory long air gaps excited with positive switching impulses. It begins with the preliminary work of several scientists during the last decades, making a detailed analysis of different approaches for modelling all the stages in a full discharge. The relations between these models are identified as well as the effect on the outcome when modifying some important input parameters. The general concept describing the discharge phenomenon usually includes three main elements: the streamer inception, the

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2

Zendehnam, A. "Excitation processes in the positive column of electrical discharges in inert gases." Thesis, London Metropolitan University, 1987. http://repository.londonmet.ac.uk/3073/.

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The variation with the current i, of the intensity, I, of neon spectral lines emitted from low pressure positive column discharges has been studied as part of an investigation of excitation processes in these discharges. The results indicate that two-step excitation is important for many neon lines. Measurements of emission line profiles have been made using a pressure scanned Fabry-Perot interfermometer. High resolution absorption measurements have been made to give data on tha population densities of the lower excited states, and their variation with pressure and current, to assist in interp

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3

Farahat, Sameer Ismail. "Electron energy distribution functions in radio-frequency discharges." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361940.

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4

Lipham, Mark Lawrence Kirkici Hulya. "Electrical breakdown studies of partial pressure argon under Khz range pulse voltages." Auburn, Ala., 2010. http://hdl.handle.net/10415/2044.

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5

Barrios, Andrés J. "Yield of metastable atoms from a rare gas discharge in a longitudinal magnetic field." FIU Digital Commons, 1993. http://digitalcommons.fiu.edu/etd/1415.

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Atomic beam experiments are limited by intensity. Intensity limitations are specially critical in the measurements of metastable atoms, since their relative population is several order of magnitude smaller than the beam population. This thesis provides a method for increasing the intensity of metastable argon and neon beams effusing from a hot cathode, glow discharge by use of a longitudinal magnetic field. The argon and neon metastable atom intensities have been measured for a range of discharge pressure, voltage, and current for a magnetic field strengths from 0 to 31 mT. For both argon and

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6

Endo, Fumihiro, Shinpei Yamamoto, Takayuki Sadakane, Akira Yamagishi, Katsunori Miyagi, and Hitoshi Okubo. "Analysis of Gasses Generated by Electrical Discharges in Low Viscosity Silicone Oil." IEEE, 2008. http://hdl.handle.net/2237/11797.

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7

LIMA, IARA B. de. "Medidas do primeiro coeficiente townsend de ionização em gases inibidores de descargas." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10626.

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Made available in DSpace on 2014-10-09T12:42:33Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:02:06Z (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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8

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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9

Ridenti, Marco Antonio. "Desenvolvimento de sistema de aquisição e tratamento de dados para medidas de parâmetros de transporte de elétrons em gases." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29062010-142535/.

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Esta dissertação descreve um experimento de Townsend pulsado cuja finalidade foi obter experimentalmente parâmetros de transporte de elétrons em gases, em particular em nitrogênio e isobutano, em uma faixa de campo elétrico reduzido entre 130 Td e 210 Td. Os parâmetros de transporte obtidos foram a velocidade média do centro de massa da nuvem eletrônica, a taxa de ionização e o coeficiente de ionização (primeiro coeficiente de Townsend). Essas grandezas foram determinadas a partir da análise do sinal eletrônico induzido pelos elétrons em deslocamento entre dois eletrodos de placas paralelas.

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10

Yuan, Qiulin. "Studies of electric discharges and their interactions with gases." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/22086.

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Measurements of the effect of increasing the discharge column voltage gradient were investigated using argon based mixtures with nitrogen, oxygen and sulphur hexafluoride in a plasma torch. The theoretical calculation of the voltage gradient and the electron number density was based on the Saha equation which was modified for application to the gas mixtures. The investigations showed that a mixture of Ar and SF6 was most effective and increased the voltage gradient to 0.5 V/mm from 0.3 V/mm. The best mixture was 89% Ar, 10% N2 , 1% SF6 based on the highest increase of the voltage gradient and

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11

Watt, Richard Comrie 1952. "Corona discharge in anesthetic gases." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/291711.

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The goal of this work was to assess the feasibility of using corona discharge quenching by anesthetic gases as a technique for anesthetic gas concentration measurement. Two experiments were conducted to investigate corona discharge and measure changes due to anesthetic gases. Experiment One used a chamber in which a high voltage was imposed across two parallel plane electrodes, between which gases under test could flow. Halothane, ethrane, and nitrous oxide were shown to have corona discharge quenching effects proportional to their relative potency. In an attempt to improve accuracy and decrea

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12

Ayeleso, Ayokunle Oluwaseun. "An improved plasma energy conversion system for electric power generation." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2694.

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Thesis (PhD (Electrical Engineering))--Cape Peninsula University of Technology, 2018.<br>The generation of electricity through the conventional conversion system such as thermal and hydroelectric plants may no longer be sufficient to meet the increasing demands and usage. One of the major reasons for shortage supply of electric power is due to the lack of fossil fuel and other conventional resources that are currently being used in Africa. In addition, the conversion process of the conventional system often causes pollution which contributes to global warming. Therefore, there is a need for th

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13

Appling, Jeffrey Robert. "Gaseous charge transfer reactions of multiply charged ions." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/27382.

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14

Balcon, Nicolas. "Atmospheric pressure radio frequency discharges, diagnostic and numerical modeling /." View thesis entry in Australian Digital Thesis, 2007. http://thesis.anu.edu.au/public/adt-ANU20080318.234936/index.html.

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15

Simao, J. M. T. B. "Electrical discharge texturing (EDT)." Thesis, University of Birmingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528899.

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16

Poteat, Sandra Lynn. "Evaluation of Scavenger Gases in a Helium Discharge Detector." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539625666.

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17

Sözer, Esin Bengisu Kirkici Hulya. "Gaseous discharges and their applications as high power plasma switches." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Electrical_and_Computer_Engineering/Thesis/Sozer_Esin_45.pdf.

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18

Africano, Fatima. "Reactive processes during the discharge of high temperature volcanic gases." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211070.

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This study shows how the composition of gases released from a single magmatic source may be modified during their ascending path. The main processes that influence the composition of the gases in these high temperature fumarolic environments, are: 1) interactions with wallrocks during gas ascent, which change the fugacities of the metal volatile species and affect the equilibrium between major species (fH2S/fSO2; fH2/fH2O); 2) mixing with meteoric water with consequent Cl adsorption, which may account for the Cl depletion of the gases; 3) remobilisation of previously formed sublimates and/or i

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19

Carman, R. J. "DC glow discharge electron guns for the excitation of rare gases." Thesis, University of St Andrews, 1986. http://hdl.handle.net/10023/14165.

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Glow discharge electron guns are used to generate continuous electron beams at 0.5keV-3.0keV in the intermediate range of gas pressures (0.1mb-10.0mb). Cathodes incorporating internal cavities are used to generate distinct electron beam filaments in both Helium and Argon. The formation of such beam filaments has been investigated using a number of different cathode types, and criteria for the production of stable electron beams are established. The production of an electron beam in a glow discharge is largely determined by the motion of electrons in the Cathode dark space sheath region next to

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20

Trueman, Christopher Stuart. "The electrical discharge machining of ceramics." Thesis, Nottingham Trent University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339531.

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21

Harrison, James Thomas Henry. "Electrical discharge chemistry of nitrogen oxides." Thesis, University of York, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292592.

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22

Cho, Margaret H. (Margaret Hyunjoo) 1982. "Environmental constituents of Electrical Discharge Machining." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32827.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (leaves 30-31).<br>Electrical Discharge Machining (EDM) is a non-traditional process that uses no mechanical forces to machine metals. It is extremely useful in machining hard materials. With the advantages EDM has to offer and its presence as a common and useable technique, along with the other machining processes available to the industrial world, there is an added strain on the environment. The scope of this thesis includes analyzing the various inputs into EDM

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23

Williams, Paul Ivan. "The discharge-avalanche model of electrical trees." Thesis, King's College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307606.

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24

Liu, Lipeng. "Physics of Electrical Discharge Transitions in Air." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-205401.

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Electrical discharges with a variety of different forms (streamers, glow corona, leaders, etc.) broadly exist in nature and in industrial applications. Under certain conditions, one electrical discharge can be transformed into another form. This thesis is aimed to develop and use numerical simulation models in order to provide a better physical understanding of two of such transitions, namely the glow-to-streamer and the streamer-to-leader transitions in air. In the first part, the thesis includes the two-dimensional simulation of the glow-to-streamer transition under a fast changing backgroun

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25

Torres, Jean-Marc. "Electrical breakdown at micrometre separations." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/447.

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26

Ojha, Nirdesh [Verfasser], Holger [Akademischer Betreuer] Reinecke, and Thomas [Akademischer Betreuer] Hanemann. "Electrical discharge machining of non-conductive advanced ceramics." Freiburg : Universität, 2016. http://d-nb.info/112264695X/34.

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27

Wong, Ming-ho Horatio, and 黃明浩. "Computer integration of the electrical discharge machining process." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30071653.

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28

Andreu, i. Batallé Jordi. "Plasma de silà amb confinament electrostàtic per a la obtenció de silici amorf hidrogenat." Doctoral thesis, Universitat de Barcelona, 1986. http://hdl.handle.net/10803/670243.

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El silici amorf hidrogenat (a-Si:H) s’ha convertit en el material semiconductor en capa prima més estudiat en els últims anys. Aquest esforç investigador està en gran part motivat pel gran nombre d’aplicacions industrial, com ara les cèl·lules solars en capa prima i baix preu de producció, les matrius de transistors d’efecte de camp per al direccionament de pantalles planes, la nova generació de sensors d’imatge, fotoreceptors per fotocopiadores i impressores làser... El primer silici amorf amb bones propietats semiconductores s’aconseguí el 1969, en desenvolupar-se una nova tècnica per a di

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29

Tahhan, Antar Mohammad. "Minimum damage wire electrical discharge machining of aerospace alloys." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3222/.

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The research focused primarily on the effects of WEDM on the surface / subsurface integrity of Ti-6Al-2Sn-4Zr-6Mo titanium alloy and Udimet 720 nickel base superalloy, and encompassed measurement of surface roughness and contamination, workpiece microhardness, recast layer thickness, residual stresses and fatigue performance. Associated productivity and manufacturing costs were also evaluated in respect of blade root slot machining in aerospace turbine / compressor discs. Preliminary tests results showed that machined surfaces with Ra of ~0.5μm, less than 2μm of recast layer and almost neutral

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30

Dufresne, Michel 1962. "Fluid model of dielectric barrier gas discharge." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34520.

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A two-fluid model of dielectric barrier gas discharge is presented in this thesis. The model predicts the physical structure of the gas discharge obtained between two electrodes, when one is covered with a dielectric material: It predicts the distribution of the electron and ion particle densities, electron energy, and electric field strength. It is a self-consistent numerical model, in which the dielectric properties of the dielectric material are included and the geometry of the electrodes is taken into account, thus coupling the charged-particle transport to the electric field.<br>New bound

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31

Erol, Mustafa. "Phonon studies in two dimensional electron gases." Thesis, Lancaster University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317611.

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32

Buntat, Zolkafle. "Ozone generation using electrical discharges : a comparative study between pulsed streamer discharge and atmospheric pressure glow discharge." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/14556.

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This thesis deals with an investigation into atmospheric pressure glow discharge and pulsed streamer discharge techniques of ozone generation, in an attempt to compare their performances in the generation of a high concentration and high yield of ozone. It is motivated by the desire to exploit further the ability and potential possessed by both techniques for ozone generation and to provide support to the increased demand for ozone in many areas of application. Chapter 1 of the thesis provides a brief history into the application of ozone. In Chapter 2, a basic understanding of the gas dischar

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33

Bish, Nigel B. "Dielectric condition monitoring using intelligent partial discharge analysis." Thesis, University of Brighton, 2003. https://research.brighton.ac.uk/en/studentTheses/5dfeb20c-6066-41b8-ba10-59ae9a7877af.

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34

Sun, Jiao. "A Robust Charge/Discharge Monitor for Lead Acid Batteries." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1364836803.

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35

Evans, N. J. "Influence of gases on the electrical properties of MIS devices." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6866/.

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This thesis studies the effects of gas ambients on the electrical properties of the insulator-semiconductor interface of a MIS capacitor. A microcomputer-controlled instrumentation system has been developed to extract this information from measurement of the a.c. admittance of MOS or MIS devices. The system incorporates several novel developments in circuitry and software which enable these admittance data to be automatically collected and processed in the frequency domain by remote recalibration of the instrumentation. This advancement permits interface state density information to be calcula

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36

Hwang, Yu-Chul. "Electrostatic discharge and electrical overstress failures of non-silicon devices." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2198.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Mechanical Engineering. 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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37

Robinson, James A. "Ozone generation in the electrical discharge from a water surface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ42255.pdf.

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38

Webb, MR, FJ Andrade, G. Games, R. McCrindle, and GM Hieftje. "Spectroscopic and electrical studies of a solution-cathode glow discharge." Journal of Analytical Atomic Spectrometry, 2005. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000982.

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A glow discharge using a solution as the cathode was investigated to add to the understanding of the operating mechanism and characteristics of such systems. The intensities and vertical distributions of emission from several analytes and background species were observed and compared with the vertical distribution of Fe excitation and OH rotational temperatures, as well as to electrical characteristics. The effects of the discharge gap size, the pH and conductivity of the solution, the applied current and the solution flow rate on these distributions were also studied. Detection limits for thi

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39

Crawford, Gregory Allan. "Process characterization of Electrical Discharge Machining of highly doped silicon." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74893.

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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 107).<br>Electrical Discharge Machining (EDM) is an advanced machining process that removes material via thermal erosion through a plasma arc. The machining process is accomplished through the application of high frequency current (typically through a fine wire or some other electrode) to a conductive workpiece. The electrode is physically separated from the workpiece by some small distance and the potential

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40

Dynes, Scott Budd Chapman. "Discharge characteristics of auditory nerve fibers for pulsatile electrical stimuli." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11194.

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41

Tunnicliffe, Martin James. "Electrical overstress and electrostatic discharge failure in silicon MOS devices." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/7304.

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This thesis presents an experimental and theoretical investigation of electrical failure in MOS structures, with a particular emphasis on short-pulse and ESD failure. It begins with an extensive survey of MOS technology, its failure mechanisms and protection schemes. A program of experimental research on MOS breakdown is then reported, the results of which are used to develop a model of breakdown across a wide spectrum of time scales. This model, in which bulk-oxide electron trapping/emission plays a major role, prohibits the direct use of causal theory over short time-scales, invalidating ear

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42

Murray, James W. H. "Damage, contamination and surface treatment of electrical discharge machined materials." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14226/.

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Electrical discharge machining (EDM) is a manufacturing process capable of machining electrically conductive materials regardless of their mechanical properties. It finds extensive usage across the aerospace, automotive, medical implant and mould/die industries, and is particularly useful for the micro-machining of precision components with complicated shapes. The surface integrity of materials machined by EDM is typically poor, and reduced service life is often expected as a result of surface properties. For example, reduced fatigue performance can result due to the presence of surface cracks

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43

Leung, Wing Chi. "Modelling greenhouse gases in a general equilibrium model." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/43724.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.<br>Includes bibliographical references (leaves 51-52).<br>by Wing Chi Leung.<br>M.Eng.

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44

Stanfield, Scott Alan II. "A SPECTROSCOPIC INVESTIGATION OF A SURFACE-DISCHARGE-MODE, DIELECTRIC BARRIER DISCHARGE." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1261582116.

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45

Aguiló, Aguayo Noemí. "Production and characterisation of carbon-encapsulated iron nanoparticles by arc-discharge plasma." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/96477.

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Carbon-encapsulated iron nanoparticles have being researched heavily, since they present advantageous properties over other protective coatings such as polymer or silica. The carbon coating protects the iron core from oxidation, chemical and thermal degradation and hence, magnetic cores present stable magnetic properties when nanoparticles are exhibited in air or other environments. Several studies about carbon-encapsulated magnetic nanoparticles were already reported. However, nanoparticles are obtained rather polydisperse and not very uniform in composition, making very difficult their use f

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46

Sanaee, Mohammad Reza. "Synthesis and Characterization of Engineered Carbon-based Nanoparticles by Arc-discharge Plasma." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/301634.

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The concept of nanotechnology is attributed to Nobel prize winner Richard Feynman who gave a very famous, visionary in 1959 (published in 1960) during one of his lectures, saying: "the principles of physic, as far as I can see, do not speak against the possibility of maneuvering things atom by atom". At the time, Feynman’s words were received as pure science fiction". Today, we have instruments that allow precisely what Feynman had predicted: creating structures by moving atoms individually. In principle, the ultimate results of this research study leads to the synthesis of magnetic and

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47

Weinstein, Viktoria. "Factors affecting glow discharge plasma spectroscopy : effect of the molecular gases and sample geometry on the spectra." Thesis, London Metropolitan University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542803.

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48

Giunchedi, Matteo. "Prediction of remaining battery discharge time for an autonomous electrical vehicle." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The project that is going to be presented by this thesis has been developed at LHP Data Analytics Solutions, a US company with headquarters in Columbus, Indiana. The work hereby presented has been carried out at that place and has been concerned with the study of an NiMH battery, supplying power to an autonomous vehicle. During the first phase, various monitoring systems have been implemented in order to gather data about battery's temperature, current and voltage and also the car's acceleration. Next, these data have been employed to develop prediction models about the remaining dischar

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49

Rhoney, Brian Keith. "Cylindrical Wire Electrical Discharge Truing of Metal Bond Diamond Grinding Wheels." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010404-133336.

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<p>The goal of this research was to use the wire Electrical Discharge Machining (EDM) to profile a metal bond diamond grinding wheel, and then study the wear and grinding performance of the EDM trued wheel. Diamond wheels are known to exhibit low wheel wear for precision grinding of ceramics but create difficulty in creating precision trued forms. With the increased use of hard engineering ceramics in mechanical design, new methods of truing these wheels had to be investigated. In profiling a vitrified bond diamond wheel, a Computer Numerically Controlled (CNC) single point diamond or a diamon

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50

Rees, Andrew. "Micro electrical discharge machining : axis-symmetric component manufacture and surface integrity." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55139/.

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The development of micro engineering is highly dependent on the machining processes that support it. Micro Electrical Discharge Machining (uEDM) is one of the key enabling technologies for the fabrication of micro tools and micro components. The capabilities of this machining technology have to be studied to determine the process capabilities and constraints. The present work investigates factors that influence the process of uEDM and the components that can be produced by applying this technology. Chapter 2 reviews the current state of the art in this field. In addition, different aspects rel

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