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Saturday, August 1, 2020 | History

1 edition of Surface dynamics of unipolar arcing found in the catalog.

Surface dynamics of unipolar arcing

Richard Keith Downs

Surface dynamics of unipolar arcing

by Richard Keith Downs

  • 308 Want to read
  • 20 Currently reading

Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsSchwirzke, Fred R.
The Physical Object
Pagination88 p.
Number of Pages88
ID Numbers
Open LibraryOL25508183M

Dielectric unipolar surface flashover under vacuum is experimentally characterized by a three-phase development, which covers a current range from A to A. Phase one comprises a fast (several nanoseconds) buildup of a saturated secondary electron avalanche reaching current levels of 10 to mA. A dictionary file. dict_files/ This class can parse, analyze words and interprets sentences. It takes an English sentence and breaks it into words to determine if it is a phrase or a clause. It can also counts the total number of words in a sentence, checks if a word is a palindrome and can generate a new sentence with almost the same meaning using synonyms .

This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation.   The influence of surface conditions on the initiation, propagation and current density of unipolar arcs in fusion devices, J. Nucl. Mat, –, (). CrossRef ADS Google Scholar Cited by: 7.

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Surface dynamics of unipolar arcing by Richard Keith Downs Download PDF EPUB FB2

One should note that such a large scale exfoliation due to unipolar arcing may enhance the surface erosion of the tungsten armour and act as a serious impurity source for. The occurrence and damage of unipolar arcing on fuzzy tungsten Article in Journal of Nuclear Materials August with 62 Reads How we measure 'reads'.

In the case of the D-III D tokamak, the mass concentration was found to be in J. Winter / Formation of dust and its role infusion devices from metal wall elements by unipolar arcing, transported via the plasma to the limiter surface and, as their surface mobility increases when the limiter gets hot from to the thermal load of the plasma, they Cited by: 5.

Furthermore we consider the current flow to the anode, expecially for the example of the “unipolar arc”. Conditions are formulated for the existence of such an arc.

Surface phenomena contributing to this mode, like for instance explosive phenomena, are discussed. The book will serve as a text book, text-related or reference book for graduate students, post graduates, and scientists in geo-astro, space, and laboratory plasma physics, electromagnetics and fluid dynamics.

In addition, it will be useful for researchers outside the plasma community who wish to obtain new physical insights, aspects, and. Power electronics switching devices currently represent the dominant technology for supplying low voltage (LV) electric motors.

The fast switching processes exert a different class of stress on dielectric insulating materials than standard sinusoidal excitations. Such stresses result in an increase in the dynamic activity of the working electric field, which in turn lead to an increased Cited by: 3.

The Sun: Images from Space has extraordinary images of beauty with over incredible details of our Sun taken from space. These images come from Solar Dynamics Observatory (SDO) Mission instruments in conjunction with other various. The Sun's corona is much hotter (by a factor from to ) than the visible surface of the Sun: the photosphere's average temperature is 5 kelvin compared to the corona's one to three million kelvin.

The corona is 10 −12 times as dense as the photosphere, and so produces about one-millionth as much visible light. The corona is separated from the photosphere by the.

Structural Dynamics Branch_Research and Accomplishments_for FY pdf Study and Review of Permanent Magnets for Electric Vehicle Propulsion Summary of Electric Vehicle dc Motor-Controller In this study, both model analysis and electrical characterization of a dielectric barrier discharge based argon plasma jet have been carried at atmospheric pressure in a pin electrode configuration.

The plasma and fluid dynamics modules of COMSOL multi-physics code have been used for the modeling of the plasma by: 5. "The occurrence and damage of unipolar arcing on fuzzy tungsten", Journal of Nuclear Materials, (Aug ) Baldwin M J and Doerner R P Thermal release of D2 from new Be-D co-deposits on previously baked co-deposits J.

Nucl. Mater. – ITER is the world’s largest fusion experiment. Thirty-five nations are collaborating to build and operate the ITER Tokamak, the most complex machine ever designed, to prove that fusion is a viable source of large-scale, safe, and environmentally friendly energy for the planet.

Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions in the atmosphere or ground temporarily equalize themselves, causing the instantaneous release of as much as one gigajoule of energy.

This discharge may produce a wide range of electromagnetic radiation, from very hot plasma created by the rapid movement of electrons to. Everyone has seen a hot cathode arcing, as in a welding arc, where electrons are freed from the metal surface of the electrode by heat.

The metal is heated by its own resistance to current, and begins emitting electrons above a certain temperature threshold specific to the electrode material. Online Dictionaries: Translation Dictionary English Dictionary French English English French Spanish English English Spanish.

#N#Portuguese English English Portuguese German English English German Dutch English English Dutch. Am I A Raison Head. Thursday, Novem And these first two examples replicate the arcing along the surface of Searl's spinning metallic disk.

(as described in Joseph Cater's book cited above) generates an electrostatic field, contrary to the dynamics of a homopolar/unipolar electromagnetic field of motion. In other words, a. The particles are charged to the same polarity as the unipolar corona ions.

Thus, the electric field gradient near the discharge electrode decreases, reducing the flow and mobil- ity of ions. Since for submicron particles, diffusion charging is the prin- cipal means of particle charging, reduction in ion mobility affects particle charging.

A combination catheter for both detecting monophasic action potentials and ablating surface tissue in an in vivo heart of a patient is provided.

The apparatus includes a catheter probe having a terminal tip portion and an electrode carried on the tip such that a portion of the tip electrode is exposed to ambient.

A reference electrode is spaced along the tip from the first electrode for Cited by:   Electric arc is a gas discharge phenomenon, the instantaneous spark generated by current passing through some insulating medium (such as air). The arc is a self-sustained discharge : Guangning Wu, Guoqiang Gao, Wenfu Wei, Zefeng Yang.

A corona (Latin, 'crown') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.

The word "corona" is a Latin word meaning "crown", from the Ancient Greek κορώνη (korōnè, “garland, wreath”). The high. The horizontal arcing is a side flash – a scatter of arc tendrils that follow surface conduction across the ground, radially away from the point of impact. The ground potential, type and shape of surface influences the character of the side flash.A TEXT BOOK OF MEDICAL INSTRUMENTS UNIPOLAR LIMB LEADS These leads are also called “ Augmented Unipolar limb leads”.

The letter ‘a’ is used to indicate augmented, ‘V’ unipolar lead and last letter R, L or F to indicate the portion of the body from which lead is taken.FIGURES (continued) Number Page Typical Pneumatic Rapper Assembly Typical Electric Vibrator Type Rapper Tumbling-Hammer Assembly for Use with Rigid-Frame Discharge Electrode and Collecting-Surface Rapping System Vacuum System for Solids Removal Pluggage of Perforated Plates at the Inlet to an.