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Добірка наукової літератури з теми "Arcs Plasma"

Автор: Grafiati

Опубліковано: 1 березня 2025

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Статті в журналах з теми "Arcs Plasma"

1

Stepanov, A. V. "Plasma processes in coronal magnetic arcs." Journal of Optical Technology 72, no. 8 (August 1, 2005): 585. http://dx.doi.org/10.1364/jot.72.000585.

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2

Tanaka, Y., K. Tomita, Y. Inada, A. Kumada, K. Hidaka, T. Fujino, K. Suzuki, and T. Shinkai. "Non-equilibrium Studies in Switching Arc Plasmas in Japan." PLASMA PHYSICS AND TECHNOLOGY 4, no. 3 (2017): 225–33. http://dx.doi.org/10.14311/ppt.2017.3.225.

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This paper briefly introduce research work examples of non-equilibrium studies in switching arcs. In understanding arc behavior, one often assumes local thermodynamic equilibrium (LTE) condition in the arc plasma. However, actual arc plasmas are not completely and not always in LTE state because of strong temperature change temporally and spatially, and high electric field application etc. Recently, we have a collaboration work in numerical simulations and experimental approaches for decaying arcs without LTE assumption. First, our numerical model is presented for decaying arcs without chemical equilibrium assumption. Secondly, two experimental methods are introduced for measuring electron density in decaying arcs without LTE assumption: Laser Thomson Scattering method and the Schack-Hartmann method. Finally, comparison results is shown between the LTE simulation, the chemically non-equilibrium simulation, and the above experimental measurements.

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3

Kullen, A., S. Buchert, T. Karlsson, T. Johansson, S. Lileo, A. Eriksson, H. Nilsson, A. Marchaudon, and A. N. Fazakerley. "Plasma transport along discrete auroral arcs and its contribution to the ionospheric plasma convection." Annales Geophysicae 26, no. 11 (October 21, 2008): 3279–93. http://dx.doi.org/10.5194/angeo-26-3279-2008.

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Abstract. The role of intense high-altitude electric field (E-field) peaks for large-scale plasma convection is investigated with the help of Cluster E-field, B-field and density data. The study covers 32 E-field events between 4 and 7 RE geocentric distance, with E-field magnitudes in the range 500–1000 mV/m when mapped to ionospheric altitude. We focus on E-field structures above the ionosphere that are typically coupled to discrete auroral arcs and their return current region. Connected to such E-field peaks are rapid plasma flows directed along the discrete arcs in opposite directions on each side of the arc. Nearly all the E-field events occur during active times. A strong dependence on different substorm phases is found: a majority of intense E-field events appearing during substorm expansion or maximum phase are located on the nightside oval, while most recovery events occur on the dusk-to-dayside part of the oval. For most expansion and maximum phase cases, the average background plasma flow is in the sunward direction. For a majority of recovery events, the flow is in the anti-sunward direction. The net plasma flux connected to a strong E-field peak is in two thirds of the cases in the same direction as the background plasma flow. However, in only one third of the cases the strong flux caused by an E-field peak makes an important contribution to the plasma transport within the boundary plasma sheet. For a majority of events, the area covered by rapid plasma flows above discrete arcs is too small to have an effect on the global convection. This questions the role of discrete auroral arcs as major driver of plasma convection.

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4

Petrovic, Zoran. "The contribution of Nikola Tesla to plasma physics and current status of plasmas that he studied." Serbian Journal of Electrical Engineering 3, no. 2 (2006): 203–16. http://dx.doi.org/10.2298/sjee0603203p.

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One of the main Interests in science of Nikola Tesla were gas discharges plasmas, their application in lighting and in production of ozone as well as their role in conduction of electricity through the atmosphere. In particular Tesla is well known as the first person to produce rf plasmas. Such plasmas in the present day constitute the main technology required to produce integrated circuits (IC) and have been essential in the revolution that resulted from IC technologies. In addition Tesla participated in studies of arcs especially arcs used as a source of light, corona discharges required to induce plasma chemical reactions and produce ozone and was involved in various aspects of gas breakdown and gaseous dielectrics. His ideas, level of his understanding and current status of these fields are discussed in this review.

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5

Siemroth, P., B. Juttner, K. Jakubka, and N. V. Sakharov. "Measurement of Plasma-Induced Arcs in Tokamaks." IEEE Transactions on Plasma Science 13, no. 5 (1985): 300–303. http://dx.doi.org/10.1109/tps.1985.4316425.

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6

Hirshfield, J. L., L. A. Levin, and O. Danziger. "Vacuum arcs for plasma centrifuge isotope enrichment." IEEE Transactions on Plasma Science 17, no. 5 (1989): 695–700. http://dx.doi.org/10.1109/27.41184.

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7

Thio, Y., and L. Frost. "Non-ideal plasma behavior of railgun arcs." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1757–62. http://dx.doi.org/10.1109/tmag.1986.1064721.

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8

Wang, Weizhen, Min Jia, Wei Cui, and Zhibo Zhang. "Process of Multiple Channel Gliding Arc Assisted Combustion Near Lean Blow-out Limit." E3S Web of Conferences 233 (2021): 01027. http://dx.doi.org/10.1051/e3sconf/202123301027.

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Multichannel gliding arcs actuators were designed to enhance the non-premixed combustion of the kerosene (RP-3) and air mixture in a swirl combustor near lean blow-out limit. The instantaneous voltage and current of the multichannel gliding arcs and the 1kHz high-speed CH* chemiluminescence imaging of the combustion process were simultaneously measured to show the characteristics of the process assisted by the plasma. When reaching near lean blow-out limit in a flow rate of 225 SLPM, at the combustor inlet, the emission intensity and projected flame assisted by the multichannel gliding arcs remain the same with decreased fuel flow rates from 3 to 1 ml/min, which assisted by the single gliding arc decreases nevertheless. The flame structure under the influence of plasma actuators with various channel numbers evolves differently owing to the differences in plasma distributions.

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9

Kozlovsky, A. E., and W. B. Lyatsky. "Instability of the magnetosphere-ionosphere convection and formation of auroral arcs." Annales Geophysicae 12, no. 7 (June 30, 1994): 636–41. http://dx.doi.org/10.1007/s00585-994-0636-9.

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Abstract. In this paper we study an instability of the plasma moving towards the Earth near the inner plasma sheet boundary. We include both the interchange instability of the plasma sheet and the magnetosphere-ionosphere interaction instability caused by an effect of field-aligned currents (connected with electron precipitation) on ionospheric conductivity. The instability leads to the separation of steady-state magnetospheric convection into parallel layers. This instability may be responsible for the appearance of quiet auroral arcs inside region 2 of field-aligned currents flowing out of the ionosphere. This instability allows us to explain also the existence of crossing auroral arcs.

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10

Stryczewska, Henryka Danuta, Grzegorz Komarzyniec, and Oleksandr Boiko. "Effect of Plasma Gas Type on the Operation Characteristics of a Three-Phase Plasma Reactor with Gliding Arc Discharge." Energies 17, no. 11 (June 2, 2024): 2696. http://dx.doi.org/10.3390/en17112696.

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Three-phase gliding arc discharge reactors are devices in which it is difficult to maintain stable plasma parameters, be it electrically, physically, or chemically. The main cause of plasma instability is the source, which is freely burning arcs in a three-phase system. In addition, these arcs burn at low currents and are intensively cooled, further increasing their instability. These instabilities translate into the electrical characteristics of the plasma reactor. The analysis for the four gases nitrogen, argon, helium, and air shows that the type of plasma-generating gas and its physical parameters have a strong influence on the operational characteristics of the plasma reactor. Current–voltage, power and frequency characteristics of the plasma reactor were plotted experimentally. Characteristics obtained in this way make it possible to determine the areas of effective operation of the plasma reactor, and to estimate the quality of the generated plasma. Based on the characteristics obtained, a method of controlling the plasma parameters can be developed.

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Більше джерел

Дисертації з теми "Arcs Plasma"

1

Graneau, P. Neal. "Ion dynamics of diffuse vacuum arcs." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306534.

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2

Wendelstorf, Jens. "Ab initio modelling of thermal plasma gas discharges (electric arcs)." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961148527.

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3

Mollart, T. P. "Electron emission processes in cold cathode thermal arcs." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5546/.

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In this Thesis the processes of electron emission from cathode electrodes are studied theoretically, and the applicability of these mechanisms to the non refractory cathodes that can be used to sustain thermal arcs was examined. Apparatus that was used to generate and manipulate thermal arcs along rail electrodes is described in this thesis. Techniques for driving arcs over polished sample electrodes with magnetic or aerodynamic forces are outlined. Scanning electron microscopy was used to study emission site formation on highly polished electrodes with a natural 2.5 nm oxide layer. Theoretical maximum electron current densities that can be extracted by the arc were calculated and these were used, in conjunction with information from the experimental work, to make estimates of the lifetime of emission spots that are seen on the cathode electrodes of thermal arc devices. The lifetime was found to be dependent on the arc velocity over a range of velocity values from 3 to 80 ms(^-1). The lifetime measured ranged from 2.4 µs to 0.024 µs. Experiments on arcs driven at a constant velocity using a combination of aerodynamic and magnetic forces showed that the formation of emission spots was independent of die applied external magnetic field. The presence of artificially grown copper (11) oxide layers, 50 nm and 100 nm thick, were found to influence the lifetime. The effect of the oxide layer was predicted using a simple model accounting for the change of resistance that such an oxide layer would be expected to cause. Additional experiments showed that the resistance of the arc was independent of the oxide layer thickness, as predicted by the model.

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4

Abdo, Youssef. "Analyse du comportement et des caractéristiques des arcs thermiques soumis à des champs externes et internes." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM040.

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Cette thèse œuvre à la compréhension et l’analyse du comportement de l’arc plasma thermique et ses interactions avec les champs électriques et magnétiques auxquels il peut être soumis. Les différentes méthodes développées et les différents cas traités correspondent à des cas d’application directe des plasmas dans les procédés industriels. L’étude de la dynamique de l’arc ainsi que de ses différentes caractéristiques constitue la pierre angulaire de tout développement des technologies plasmas thermiques, qui s’avèrent très prometteuses avec la transition énergétique tant sur le plan écologique grâce à leur propreté et leur faible empreinte carbonique que sur le plan technologique grâce aux températures élevées et fortes densités énergétiques dont elles sont dotées.Nous proposons deux différentes approches principales dans cette thèse pour le traitement du modèle mathématique présenté au chapitre 2 : une approche analytique et une approche numérique. L’approche analytique englobe plusieurs méthodes de calcul qui sont relativement simples à implémenter et très précieuses dans la conception de base. Elles constituent une extension de quelques méthodes mathématiques qui ont été abordées par des chercheurs russes et américains dans les années 1960 et 1970 mais qui ont été ensuite abandonnées avec l’avènement de la micro-informatique.Une partie est consacrée à l’étude d’un arc AC ou DC à pieds fixes soumis à un champ transversal (magnétique externe, auto-induit et/ou un champ de vitesse). Les résultats de calcul analytique suggèrent que la stabilisation d’un tel type d’arc est dictée par sa courbure. Des critères de stabilité, mettant en avant des nombres adimensionnels furent établis. Les résultats obtenus sont confrontés à des résultats numériques. Un très bon accord est observé.Une autre partie est dédiée à l’étude d’un arc à pieds mobiles qui se déplace entre 2 rails parallèles ou 2 électrodes concentriques sous l’effet un magnétique transversal ou d’un champ magnétique induit par les électrodes. Les propriétés de ce mouvement dépendent du rayon de l’arc. Ce dernier est obtenu à partir de la résolution complète de l’équation de la chaleur en 2D. Les résultats sont validés par comparaison avec des résultats expérimentaux et numériquesLe calcul radiatif est également abordé dans cette thèse. Celui-ci, étant très compliqué à implémenter même au moyen d’un calcul numérique du fait de sa dépendance d’un nombre variables (fréquence du spectre, la température, la pression, la géométrie, la composition du mélange, etc.), est couramment approximé par la méthode de la sphère isotherme de rayon. En comparant des résultats obtenus par calcul exact et calcul approximatif pour un arc H2 à stabilisé par parois, un algorithme permettant de calculer le meilleur choix du paramètre est établi.La partie réservée à la modélisation numérique se propose de présenter les différentes méthodes numériques utilisées actuellement dans la modélisation de l’arc et des torches électriques. Elle fournit les bonnes conditions à prendre pour le potentiel vecteur pour un modèle numérique de transport (TADR). 2 méthodes hybrides volumes-finis et éléments-finis (VF-EF) sont proposés afin de mieux améliorer la modélisation des arcs. Les équations de l’écoulement sont résolues par la méthode VF (des approches classiques VF peuvent être implémentées). Les équations de l’électromagnétisme sont résolues par les méthodes EF.D’autres méthodes numériques utilisées afin de pouvoir mener le calcul pour des réacteurs à grande échelle sont aussi présentées. Une séparation entre les phénomènes physiques à grande et à petite échelles est adoptée. Les phénomènes électromagnétiques qui accompagnent l’arc sont modélisés analytiquement et insérés en tant que terme source. Seules les équations de l’écoulement sont résolues, afin d’obtenir les caractéristiques principales au sein du réacteur industriel (champ de vitesse, distribution de température, etc.)
This PhD thesis aims at understanding and analysing the behaviour of plasma arcs and their interactions with magnetic and dynamic field. The various methods that we have developed and the different case studies correspond to direct applications of thermal plasmas in industrial processes. The study of the arc’s dynamic and its characteristics is at the heart of every plasma technology upgrade or development. In the wake of the energy transition, plasma systems turn out to be very promising for many reasons, the most important of which are: They are ecological given the fact that make use of clean energy (electricity). Technologically, they allow for a tremendous rise in temperature that exceeds by far the temperature that can be reached in conventional combustion processes.We propose two different approaches to deal with the mathematical model that correspond to thermal plasmas: An analytical and a numerical approach. The analytical approaches encompass multiple computation methods that are relatively easy to implement and very practical for basic design. They constitute an extension of various analytical methods already broached in the 60’s and 70’s by American and Soviet researchers, but later abandoned in favor of numerical modelling with the advent of advanced computational machines.One section is dedicated to the study of a fixed spots AC or DC arc exposed to cross fields (magnetic or dynamic). Stability criteria employing dimensionless numbers have been established. At high currents, radiation also plays a key role in stabilisation. The analytical results are compared with the results of numerical simulations. A good agreement is observed.Another part deals with the study of a plasma arc, moving between 2 parallel electrodes under the effect of an external or electrode-induced magnetic field. The properties of the arc's dynamic strongly depend on the arc radius. The latter is obtained from an analytical 2D resolution of the heat equation. The results are validated by comparison with previous analytical and numerical works.The radiative exchange is also addressed in this thesis. Given the fact that radiation is hard to implement even in a numerical setting because of its dependence on numerous variables (specter frequency, temperature, pressure, geometry, gas mixture and species, etc.), the isothermal sphere approximate method is commonly used. An algorithm, whose aim is to seek the best value of “Rs”, is built based on a comparison between approximate and exact calculation for a wall stabilised arc of H2 at .The part concerning numerical modelling presents all the numerical approached that are currently used in thermal plasma modelling. It provides the good boundary conditions for the magnetic potential , if a transport model (TADR) is employed in a steady-state case or when the magneto-quasi static (MQS) assumption is made. Two hybrid finite-volume and finite-element (FV-FE) methods are proposed in order to improve the arc modelling, in particular for AC transient cases where the MQS fails to remain valid especially when electrodes are accounted for. Flow, energy and transport equation are solved using the FV approach whereas the electromagnetic equations are solved by means of the FE method. Comparisons with benchmark cases are done and a very good agreement is observed.Other numerical methods used for the numerical simulation of large scale industrial plasma reactors are also presented. A separation between the different physical phenomena occurring at small and large scales, is made. The electromagnetic phenomena are analytically modelled and averaged for an AC (mono, three or multi-phase) and are then inserted as source terms in source domains representing the arc region. As consequence, only the flow and energy equations are solved in order to obtain the most important characteristics in the reactor (velocity field, temperature distribution, etc.)

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5

Lisnyak, Marina. "Theoretical, numerical and experimental study of DC and AC electric arcs." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2013/document.

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L’apparition accidentelle d’un arc électrique dans le système de distribution électrique d’un aéronef peut compromettre la sécurité du vol. Il existe peu de travaux liés à cette problématique.Le but de ce travail est donc d’étudier le comportement d’un arc électrique, en conditions aéronautiques,par des approches théorique, numérique, et expérimentale. Dans ce travail, un modèle MHD de la colonne d’arc à l’ETL a été utilisé, et résolu à l’aide du logiciel commercial comsolMultiphysics. Afin de décrire l’interaction plasma-électrodes, le modèle a dû étendu pour inclure les écarts à l’équilibre près des électrodes. Ces zones ont été prises en compte en considérant la conservation du courant et de l’énergie dans la zone hors-équilibre. L’approche choisie et le développement du modèle ont été détaillés. La validation du modèle dans le cas d’un arc libre a montré un excellent accord avec les résultats numériques et expérimentaux de la littérature.Ce modèle d’arc libre a été étendu au cas de l’arc se propageant entre des électrodes en configuration rails et en géométrie 3D. Une description auto-cohérente du déplacement de l’arc entre les électrodes a été réalisée. La simulation numérique a été faite pour des arcs en régimes DC, pulsé et AC à des pressions atmosphériques et inférieures. Les principales caractéristiques de l’arc ont été analysées et discutées. Les résultats obtenus ont été comparés avec les résultats expérimentaux et ont montré un bon accord.Ce modèle d’arc électrique est capable de prédire le comportement d’un arc de défaut dans des conditions aéronautiques. Des améliorations du modèle sont discutées comme perspectives de ce travail
The ignition of an electric arc in the electric distribution system of an aircraft can be a serious problem for flight safety. The amount of information on this topic is limited, however. Therefore,the aim of this work is to investigate the electric arc behavior by means of experiment and numerical simulations.The MHD model of the LTE arc column was used and resolved numerically using the commercial software comsol Multiphysics. In order to describe plasma-electride interaction, the model had to be extended to include non-equilibrium effects near the electrodes. These zones were taken into account by means of current and energy conservation in the non-equilibrium layer. The correct matching conditions were developed and are described in the work. Validation of the model in the case of a free burning arc showed excellent agreement between comprehensive models and the experiment.This model was then extended to the case of the electric arc between rail electrodes in a 3D geometry. Due to electromagnetic forces the electric arc displaces along the electrodes. A self-consistent description of this phenomenon was established. The calculation was performed for DC, pulsed and AC current conditions at atmospheric and lower pressures. The main characteristics of the arc were analyzed and discussed. The results obtained were compared with the experimental measurements and showed good agreement.The model of electric arcs between busbar electrodes is able to predict the behavior of a fault arc in aeronautical conditions. Further improvements of the model are discussed as an outlook of the research

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6

Sinton, Rowan Peter William. "Long Distance Exploding Wires." Thesis, University of Canterbury. Electrical and Computer Engineering, 2011. http://hdl.handle.net/10092/6586.

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Electrical arcs are usually created with the breakdown of air, requiring an average electric field (AEF) of at least 100 kV/m in long spark gaps. This thesis explores a novel method of creating long electrical arcs using exploding wires (EWs). Arcs up to 60 m long have been produced with AEFs of just 4.5 kV/m. Extensive observations of the EW process are presented, which demonstrate that the arcs, which are a type of ‘restrike', form via the seldom-reported ‘plasma bead' restrike mechanism. Beads of plasma appear to form at sites of wire fragmentation, and can expand and coalesce into a continuous plasma column. There are strict conditions under which the plasma beads, and hence restrike channels, are produced. A restrike prediction model has been developed to provide a reliable method of producing restrike. The model was derived from the improved understanding of the restrike mechanism, and uses the wire's length and the energy supply voltage and characteristics as inputs. Capability diagrams are then constructed, which allow researchers to easily design experiments that will produce restrike. Extensive descriptions are provided of the experimental environments that were designed and constructed to facilitate long distance EW experiments. Experiments have been performed inside a high voltage laboratory, in the laboratory's outdoor compound, off the laboratory's earth grid and completely off-site. The off-site location allowed vertical experiments, suspended by a weather balloon, to be performed. This led to a theory on artificially triggered lightning, which is one of many exciting future applications that are suggested. It is also predicted that other research groups will be able to create arcs of several hundred metres long.

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7

Giersch, Louis Roy Miller. "Experimental investigation of plasma sail propulsion concepts using cascaded arcs and rotating magnetic field current drive /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9958.

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8

Rehmet, Christophe. "Étude théorique et expérimentale d’une torche plasma triphasée à arcs libres associée à un procédé de gazéification de matière organique." Thesis, Paris, ENMP, 2013. http://www.theses.fr/2013ENMP0041/document.

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Les torches à arcs plasma sont actuellement utilisées dans de nombreuses applications industrielles. Une technologie plasma triphasée à électrodes en graphite est en cours de développement au Centre PERSEE MINES ParisTech. Cette technologie diffère sensiblement des technologies à courant continu traditionnelles et vise à dépasser certaines limites des systèmes actuels en termes de robustesse, de coûts d'équipement et d'exploitation pour des applications liées à conversion et la valorisation de biomasse et déchets. Dans le but d'améliorer la compréhension des phénomènes physiques instationnaires intervenant dans les décharges triphasées, une étude menée en parallèle sur les plans théorique et expérimental a été conduite en conditions non réactives (azote et gaz de synthèse). Sur un plan expérimental cette étude s'est appuyée sur des analyses réalisées avec une caméra ultra rapide (100 000 images par seconde) et l'analyse des signaux électriques. Sur un plan théorique cette étude a consisté à développer un modèle Magnéto-Hydro-Dynamique (MHD) 3D instationnaire de la zone d'arc dans l'environnement du logiciel Code Saturne® et à effectuer une étude paramétrique basée sur le courant, la fréquence et le débit de gaz plasma. Deux configurations : électrodes coplanaires et parallèles ont été étudiées. Cette étude a permis de mettre en avant l'influence des phénomènes électromagnétiques et hydrodynamiques sur le déplacement de l'arc. Dans le cas coplanaire les jets aux électrodes semblent jouer un rôle prépondérant sur le mouvement des arcs, les transferts de chaleur dans l'espace inter électrode et l'amorçage des arcs. Dans le cas parallèle le mouvement des canaux chauds semble être le paramètre dominant. La confrontation des résultats théoriques et expérimentaux a montré un très bon accord à la fois au niveau du mouvement des arcs et des signaux électriques
Arc plasma torches are widely used in industrial applications. A 3-phase AC plasma technology with consumable graphite electrodes is under development at PERSEE MINES - ParisTech. This technology noticeably differs from the classical DC plasma torches and aims at overcoming a number of limits of plasma systems in terms of reliability, equipment and operating costs. In order to improve the understanding of the unsteady physical phenomena in such plasma systems, a theoretical and experimental study is conducted under non reactive condition (nitrogen, syngas). Experimental study is based on high speed video camera (100 000 frames per second) and electrical signal analyses. Theoretical analysis is based on 3D unsteady Magneto-Hydro-Dynamic (MHD) model of the arc zone using CFD software Code_Saturne®, by a parametric study based on current, frequency and plasma gas flow rate influence. Two configurations: coplanar and parallel electrodes are studied. These studies highlight the influence of electromagnetic and hydrodynamic phenomena on the arc motion. In coplanar electrode configuration, electrode jets appear to be the dominant parameter on the arc motion, heat transfer and arc ignition. In the parallel electrodes configuration, the motion of the hot channel seems to be the key parameter. Comparison between MHD modeling and experimental results shows a fair correlation, both in accordance with the arc behavior and the electrical waveform

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9

Bilek, Marcela. "Plasma behaviour and properties in filtered cathodic vacuum arcs with application to the deposition of thin film silicon." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627143.

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10

RANAIVOSOLOARIMANANA, ALBERT. "Caracterisation electrique et energetique des arcs glissants. Quelques applications en plasma-chimie de composes azotes, carbones et soufres." Orléans, 1997. http://www.theses.fr/1997ORLE2057.

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Анотація:

Ce rapport est base sur l'etude de l'arc glissant appele aussi glidarc. C'est une decharge electrique soufflee par du gaz. Une premiere etape consiste a determiner les caracteristiques d'une decharge dans un gaz quasi-stagnant. Nous realisons cette caracterisation a partir des acquisitions de donnees numeriques des parametres electriques (courant-tension aux bornes des electrodes). L'observation d'une similitude entre les enregistrements effectues avec une decharge dans l'air quasi-stagnant et ceux avec un glidarc nous permet d'utiliser le meme modele electrique dans les deux cas. Des diagnostics spectroscopiques moleculaires nous indiquent les temperatures electronique, rotationnelle et vibrationnelle dans la decharge. Des diagnostics sur differentes regions nous fournissent des informations sur l'evolution de l'etat de la decharge. Au voisinage de la region d'amorcage, la decharge est en quasi-equilibre thermodynamique ; puis en s'evoluant elle se met en etat hors equilibre thermodynamique. Pour determiner l'efficacite du glidarc en plasma-chimie, nous effectuons des analyses par chromatographie en phase gazeuse des gaz a l'entree et a la sortie du reacteur. Quelques tests avec differents gaz ont ete menes. La faisabilite de la dissociation du co#2 en co et o#2, la conversion du n#2o en no#2, la destruction du h#2s ou du ch#3sh et l'enrichissement en h#2 du gaz naturel ou du methane ont ete etudies.

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Книги з теми "Arcs Plasma"

1

Beilis, Isak. Plasma and Spot Phenomena in Electrical Arcs. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44747-2.

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2

Kutzner, Janusz. Przepływ plazmy w dyfuzyjnym wyładowaniu łukowym w próżni. Poznań: Wydawn. Politechniki Poznańskiej, 1993.

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3

United States. National Aeronautics and Space Administration., ed. A mathematical model of the structure and evolution of small scale discrete auroral arcs. Ithaca, N.Y: School of Electrical Engineering and Laboratory of Plasma Studies, Cornell University, 1990.

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4

M, Oks E., and Brown Ian G, eds. Emerging applications of vacuum-arc-produced plasma, ion, and electron beams. Dordrecht: Kluwer Academic Publishers, 2003.

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5

L, Boxman R., Sanders David M, and Martin Philip J, eds. Handbook of vacuum arc science and technology: Fundamentals and applications. Park Ridge, N.J., U.S.A: Noyes Publications, 1995.

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6

Zhukov, M. F., and I. M. Zasypkin. Ėlektrodugovye generatory termicheskoĭ plazmy. Novosibirsk: "Nauka", 1999.

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7

Dembovský, Vladimír. Plasma metallurgy: The principles. Amsterdam: Elsevier, 1985.

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8

Dembovsky, Vladimír. Plasma metallurgy: The principles. Amsterdam: Elsevier, 1985.

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9

Jerome, Feinman, ed. Plasma technology in metallurgical processing. Warrendale, PA: Iron and Steel Society, 1987.

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10

P, Volchkov Ė, Zhukov Mikhail Fedorovich, Institut teplofiziki (Akademii͡a︡ nauk SSSR), Institut teplofiziki (Rossiĭskai͡a︡ akademii͡a︡ nauk), and Institut teoreticheskoĭ i prikladnoĭ mekhaniki (Rossiĭskai͡a︡ akademii͡a︡ nauk), eds. Nizkotemperaturnai͡a︡ plazma. Novosibirsk: "Nauka," Sibirskoe otd-nie, 1990.

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Частини книг з теми "Arcs Plasma"

1

Anders, André. "The Interelectrode Plasma." In Cathodic Arcs, 175–225. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-79108-1_4.

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2

Paschmann, Götz, Stein Haaland, and Rudolf Treumann. "Remote Sensing of Auroral Arcs." In Auroral Plasma Physics, 21–40. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1086-3_2.

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3

Eriksen, Paul. "Measurements of Welding Arcs and Plasma Arcs." In NATO ASI Series, 157–67. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-0661-8_11.

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4

Beilis, Isak. "Spot Plasma and Plasma Jet." In Plasma and Spot Phenomena in Electrical Arcs, 725–67. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44747-2_18.

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5

Milewski, John O. "Lasers, Electron Beams, Plasma Arcs." In Additive Manufacturing of Metals, 85–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58205-4_5.

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6

Borovsky, Joseph E., and David M. Suszcynsky. "Optical Measurements of the Fine Structure of Auroral Arcs." In Auroral Plasma Dynamics, 25–30. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm080p0025.

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7

Mcilwain, C. E. "Cold Plasma Boundaries and Auroral Arcs." In Physics of Auroral Arc Formation, 173–74. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm025p0173.

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8

Beilis, Isak. "Anode Phenomena in Electrical Arcs." In Plasma and Spot Phenomena in Electrical Arcs, 493–542. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44747-2_14.

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9

Borovsky, Joseph E. "The Strong-Double-Layer Model of Auroral Arcs: an Assessment." In Auroral Plasma Dynamics, 113–20. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm080p0113.

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10

Behrisch, R. "Surface Erosion by Electrical Arcs." In Physics of Plasma-Wall Interactions in Controlled Fusion, 495–513. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-0067-1_12.

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Тези доповідей конференцій з теми "Arcs Plasma"

1

Wang, L., J. Chen, Z. Zhang, X. Wang, H. Wang, and Y. Xie. "Model of multi-components vacuum arcs and its application in vacuum interrupters and vacuum ion sources." In 2024 IEEE International Conference on Plasma Science (ICOPS), 1. IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10627416.

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2

Schukla, P. K. "Theory of auroral arcs." In International conference on plasma physics ICPP 1994. AIP, 1995. http://dx.doi.org/10.1063/1.49054.

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3

Larsen, Hilde Loken, and Jon Arne Bakken. "MODELLING OF INDUSTRIAL AC ARCS." In Progress in Plasma Processing of Materials, 1997. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-1996.990.

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4

Juettner, Burkhard. "ELECTRODE SPOT PLASMAS OF ELECTRIC ARCS." In Progress in Plasma Processing of Materials, 2003. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-2002.210.

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5

Kosse, S., M. Wendt, D. Uhrlandt, K. D. Weltmann, and Ch Franck. "MHD simulation of moving arcs." In 2007 IEEE International Pulsed Power Plasma Science Conference (PPPS 2007). IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4652361.

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6

Saevarsdottir, G. A., Jon Arne Bakken, V. G. Sevastyanenko, and Liping Gu. "High-Power AC Arcs in Metallurgical Furnaces." In Progress in Plasma Processing of Materials, 2001. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-2000.210.

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7

Uhrlandt, D., R. Kozakov, G. Gott, M. Wendt, and H. Schopp. "Temperature profiles of welding arcs and its interpretation." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383562.

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8

van der Mullen, Joost J. A. M. "EQUILIBRIUM AND NON-EQUILIBRIUM PHENOMENA IN ARCS AND TORCHES." In Progress in Plasma Processing of Materials, 2001. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-2000.200.

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9

Saevarsdottir, G. A., M. Thoresen, and Jon Arne Bakken. "IMPROVED CHANNEL ARC MODEL FOR HIGH-CURRENT AC ARCS." In Progress in Plasma Processing of Materials, 1999. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/itppc-1998.220.

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10

Rickett, Barney, Dan Stinebring, Bill Coles, Gao Jian-Jian, Marta Burgay, Nicolò D’Amico, Paolo Esposito, Alberto Pellizzoni, and Andrea Possenti. "Pulsar Scintillation Arcs reveal filaments in the Interstellar Plasma." In RADIO PULSARS: AN ASTROPHYSICAL KEY TO UNLOCK THE SECRETS OF THE UNIVERSE. AIP, 2011. http://dx.doi.org/10.1063/1.3615088.

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Звіти організацій з теми "Arcs Plasma"

1

Ebert, Aurora, Robert J. Connor, and Charles Kieffer III. Fatigue Strength and Ductility of Steel Plates with Holes Made from Plasma Cutting Methods. Purdue University, 2025. https://doi.org/10.5703/1288284317767.

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Анотація:

A literature review was conducted to evaluate current standards and existing research around the use of plasma arc cutting for holes (PACH) in the context of steel bridge applications. Additionally, an investigation into the state of the practice was conducted to determine if the latest technological advancements and equipment capabilities for plasma cutting could prove PACH to be an acceptable hole making process for bridge applications. Much of the existing research focuses on drilling and punching to make holes, but very limited experimental studies and data exists specifically evaluating plasma arc cutting. The most comprehensive study, including PACH, is discussed more thoroughly. Although limited, the findings from the existing research and the state of the practice are promising and suggest that plasma arc cutting may be acceptable as a hole making technique. To conclusively determine if such is the case, the research team recommends further experimental large-scale studies testing fatigue and strength at low temperatures.

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2

Tubesing, P. K., D. R. Korzekwa, and P. S. Dunn. Plasma arc melting of zirconium. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/638217.

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3

Reusch, M. F., and K. Jayaram. A rotating arc plasma invertor. Office of Scientific and Technical Information (OSTI), February 1987. http://dx.doi.org/10.2172/6636612.

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4

Hollis, K., B. Bartram, R. Strom, J. Withers, and J. Massarello. Plasma Transferred Arc Deposition of Beryllium (Preprint). Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada442194.

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5

Sartwell, Bruce D., and James E. Crouch. Plasma Arc Destruction of DoD Hazardous Waste. Fort Belvoir, VA: Defense Technical Information Center, June 2003. http://dx.doi.org/10.21236/ada607340.

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6

Imhoff, Seth D., Robert M. Aikin, Jr., Hunter Swenson, and Eunice Martinez Solis. DU Processing Efficiency and Reclamation: Plasma Arc Melting. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1395002.

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7

Hawkes, G. L., H. D. Nguyen, S. Paik, and M. G. McKellar. Modeling of thermal plasma arc technology FY 1994 report. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/114645.

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8

Barnes-Smith, P. Life cycle cost analysis for the Plasma Arc Furnace. Office of Scientific and Technical Information (OSTI), March 1994. http://dx.doi.org/10.2172/10153061.

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9

Ruzic, David N. Surface Plasma Arc by Radio-Frequency Control Study (SPARCS). Office of Scientific and Technical Information (OSTI), April 2013. http://dx.doi.org/10.2172/1084739.

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10

Zaghioul, Hany H., Louis J. Oirceo, Robert A. Newsom, Edgar D. Smith, and Stephen W. Maloney. Destruction of Asbestos-Containing Materials Using Plasma Arc Technology. Fort Belvoir, VA: Defense Technical Information Center, April 1997. http://dx.doi.org/10.21236/ada326759.

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