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Wednesday, April 29, 2020 | History

2 edition of Hypervelocity impact induced arcing and Kapton pyrolization in a plasma environment found in the catalog.

Hypervelocity impact induced arcing and Kapton pyrolization in a plasma environment

Hypervelocity impact induced arcing and Kapton pyrolization in a plasma environment

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  • 32 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Space debris.,
  • Solar cells.

  • Edition Notes

    StatementRobert J. Christie, Steve R. Best, and Craig A. Myhre.
    SeriesNASA technical memorandum -- 106528., NASA technical memorandum -- 106528.
    ContributionsBest, Steve R., Myhre, Craig A., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14666680M

    Thermoelectricity in polymer composites due to fluctuation-induced tunneling† T. Stedman, K. Wei, G. S. Nolas and L. M. Woods* Transport in heavily-doped polymer composites, characterized by localized charge regions, is examined in light of the recent interest in polymers for thermoelectric applications. The developed fundamental.   I doubt it since the hot plasma would etch any material, and Al, Si and O atoms will enter the plasma, which greatly increases the radiation losses. With respect to heat transport, the plasma density (~10 14 particles/cc) is very low, so that even if the temperature is in the millions of degrees, the energy transfer by conduction is low since. Start studying Chapter 2: X-ray Beam. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A hydrophilic and hydrophobic microporous layer (MPL)-coated gas diffusion layer (GDL) is developed to enhance the performance of polymer electrolyte fuel cells (PEFCs) under high humidity by: 9.


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Hypervelocity impact induced arcing and Kapton pyrolization in a plasma environment Download PDF EPUB FB2

Get this from a library. Hypervelocity impact induced arcing and Kapton pyrolization in a plasma environment. [Steve R Best; Craig A Myhre; United States. An impact-induced signal in LEO thus results from the difference in temperature between the ambient space plasma and the impact plasma provided that the impact creates a sufficient amount of free charges to establish a new floating potential V f.

For low Earth orbits with low inclination, the difference is approximately a factor of 5 to The Cited by: 2. The electromagnetic properties of plasma produced by hypervelocity impact Article in Physics of Plasmas 25(2) February with 72 Reads How we measure 'reads'.

Conclusions Experiments indicate that the coil measurement sys- tem can give credible measuring results for magnetic induction intensity induced by plasma during hyper- velocity impact. Experimental results show that the average magnetic induction intensity at incidence an- gle of 90q is larger than those at incidence angles of 45qand 60q at Cited by: Detection of electromagnetic pulses produced by hypervelocity micro particle impact plasmas Article in Physics of Plasmas 20(9) September with 80 Reads How we measure 'reads'.

Using a two-stage light gas gun, a series of hypervelocity impact experiments was conducted in which mm-diameter spherical aluminum projectiles impact mm-thick targets made of the same material at velocities of, and km/ by: 4.

For describing hypervelocity impact (relative low-speed as related to space debris and much lower than travelling speed of meteoroids) phenomenon associated with plasma generation, a self-developed 3D code was advanced to numerically simulate projectiles impacting on a rigid wall.

The numerical results were combined with a new ionization model which was developed in an early study Cited by: 4. The purpose of the paper is to investigate the discharge of the plasma generated by a projectile hypervelocity impact on solar array with three kinds of different substrates at the 60° incidence angle and the external applied voltage of by: 4.

Impact Plasma formation Initial electron motion Plasma expansion Figure 1: Depiction of the plasma generation and expansion process due to hypervelocity impact. A proposed mechanism for RF emission resulting from electron oscilla-tion in an impact-generated plasma is described in detail by Close et al.

(1) The general concept is outlined in gure1. Acta astronautica (), pp ISSN: International Astronautical Congress (IAC) English: Journal Article, Conference Paper.

plasma by the use of a low pressure, radio-frequency induced, gaseous discharge. The optical measurements were made using an Olympus Microscope. Coordinates were supplied using a xy-positioner.

The Kapton sample was cut from a sheet of mm thickness Sheldahl, covered on both faces with microns ( k,) of SiOx where This paper describes the results of an experimental investigation of the penetration phenomena associated with oblique hypervelocity projectile impact of aluminum dual‐wall structures.

Equations that quantitatively describe these phenomena are obtained through a. We have carried out hypervelocity impact experiments on thin materials using the railgun accelerator at the Institute of Space and Astronautical Science, with the aim of clarification of the process of the plasma generation in case of the thin target.

In our experiments, the velocity of the projectile is around km/: Yoichi Nagaoka, Koji Tanaka, Susumu Sasaki. @article{osti_, title = {Physics of arcing, and implications to sputter deposition}, author = {Anders, Andre}, abstractNote = {Arcing is a well-known, unwanted discharge regime observed on the surface of sputtering targets.

The discharge voltage breaks down to less than 50 V while the current jumps to elevated levels. Arcing is unwanted because it prevents uniform deposition and creates Cited by: The Dependence of Atomic Oxygen Undercutting of Protected Polyimide [email protected] H Upon Defect Size Aaron Snyder and Kim K.

de Groh Glenn Research Center, Cleveland, Ohio Prepared for the Eighth International Symposium on Materials in a Space Environment and the Fifth International Conference on Protection of Materials and Structures for.

Recent years have witnessed an astonishing growth in research on materials science. Exotic new materials, innovative processing techniques and challenging computational methods make the pursuit of research in this field increasingly interesting and rewarding.

Considering as it does, the significance of shock-wave phenomena in the rapidly changing materials science scene, this collection of. The direct simulation Monte Carlo method is used to study neutral species transport in cylindrical, high plasma‐density systems. This technique is well suited for the transition flow regime in which these reactors operate.

The ground state neutral density is depleted in the volume of the chamber due to ionization and is enhanced at bounding walls due to ion–electron surface by: Mechanical and electrical properties of Al2O3 films are compared for plasma-assisted atomic layer deposition (ALD) and thermal ALD on two substrates, GaAs and Si, of different thermal expansion coefficient.

Films with stable chemical structure and mechanical residual stress could be produced by both techniques without inducing any damage to sensitive multiquantum-well by: 8. plasma, thermal plasma processing and plasma reactors became the most important research tool.

A basic requirement for any modeling work, however, is a data base of thermodynamic and transport properties. Recently, significant influence of metal vapours in many applic.

tions. Plasma Sources Sci. Technol. 19 () J E Foster et al (a) (b) Figure 1. (a) Schematic depiction of the apparatus used to producethe plasma jet and characterize its effect on liquid water. (b)Equivalent circuit depiction of the apparatus.

Because as a glass enclosure tube ages, some tungsten vaporizes and coats the inside of the glass enclosure, which changes the electrical properties of the tube and allows tube current to stray and interact with the glass, causing arcing and failure. External manifestations and the mechanism of the previously unknown phenomenon of explosion impact-induced reactions in thin-layer polymer samples of vinyl halide polymers are studied by performing experiments on a vertical impact-testing machine.

The critical parameters of initiation are determined and the physicochemical limitations on their manifestation are by: 2. plasma is produced in a large vacuum chamber of diameter cm and length cm in which several (2–12) electrodes are arranged in a regular polygon and connected to multi-phase (2–12 phases) voltage sources.

The discharge regions, namely the plasma production. LEO. In order to simulate the impact energy of AO, a laser-detonation method has been applied [4]. In this presentation, a method for accelerating electrically neutral atoms to hyperthermal velocity by laser-induced plasma will be presented and introduced.

The laser-detonation hyperthermal beam source. This option allows users to search by Publication, Volume and Page Selecting this option will search the current publication in context.

Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in contextCited by:   This site uses cookies. By continuing to use this site you agree to our use of cookies.

To find out more, see our Privacy and Cookies policy. PRINCETON, N.J., J — Turbulence, the violently unruly disturbance of plasma, can prevent plasma from growing hot enough to fuel fusion reactions.

Long a puzzling concern of researchers has been the impact on turbulence of atoms recycled from. Currently, low-dielectric polyimides (PIs) such as fluorinated or porous PIs exhibit a low-dielectric property but have undesirable mechanical and/or thermal properties.

Therefore, it is crucial to find a more considerate method that could lower the permittivity, while maintaining or improving the mechanical and thermal properties.

Herein, a series of hyperbranched (HB) PI films were Cited by: Institute of plasma physics › Research › Publications Publications Yearauthor. The high-density plasma source used in this work is a radio frequency inductively coupled plasma ~ICP.

source of planar coil design. This plasma source has also been referred to in literature as transformer coupled plasma ~TCP. and ra-dio frequency induction ~RFI. source.

A schematic outline of the ICP reactor used is shown in Fig. It is Cited by: Plasma Physics and Technology Journal Volume 3 () Number 1. Investigation of the Arc-Anode Attachment Area by Utilizing a High-Speed Camera.

Ondac P. 1,2, Maslani A. 1, Hrabovsky M. 1 Institute of Plasma Physics AS CR, Za Slovankou /3, 00 Prague 8, Czech Republic. 2) gas in argon plasma.

The DEZ and oxygen were fed in the stoichiometric molar ratio (O 2:DEZ¼) necessary for complete oxidation of DEZ to ZnO, CO 2 and H 2O. The ZnO nanocrystals synthesized in the plasma were carried to the second stage by the gas flow, which achieves supersonic speeds upon expansion through the slit.

The ZnO. Herein, we present, for the first time, a new procedure to fabricate stoichiometric, uniform, and highly crystalline lead perovskite thin films based on a multi-step vapor deposition technique. In this process, the perovskite film is prepared by layer-by-layer alternating (LBLA) vacuum deposition of PbI2 and Materials Chemistry Frontiers HOT articles for MCF Editors’ RecommendationCited by: In Book of Contributed Papers: 18th Symposium on Application of Plasma Processes and Workshop on Plasmas as a Planetary Atmospheres Mimics.

Bratislava: p. ISBN: 8. these devices a metallic plasma jet is ejected from the cathode surface. If a substrate is located facing the plasma jet its surface is coated with a metallic film.

The main disadvantage of vacuum arc deposition is the emission of macro-particles (MPs) from the cathode. MPs in the coatings produce. SPIE Digital Library Proceedings. 8 January Study on characteristic between filamentary and pseudo-glow discharges in atmospheric air by photoelectronic methodAuthor: Li Yang, Lifang Dong, Yanzhao Zhang, Yuyan Qi, Zengchao Zhao, Yonghui Li.

Plasma acceleration structures are excited by coherent mo-tion of the plasma e driven by resonant energy sources in the plasma. Plasma e typically oscillate within the poten-tial well of the background ions spatially limited to a single bucket and do not co-propagate with the driver.

Trapping is a mechanism of self-injection of plasma e into. In this study we design and construct high-efficiency, low-cost, highly stable, hole-conductor-free, solid-state perovskite solar cells, with TiO2 as the electron transport layer (ETL) and carbon as the hole collection layer, in ambient air.

First, uniform, pinhole-free TiO2 films of various thicknesses were deposited on fluorine-doped tin oxide (FTO) electrodes by atomic layer deposition (ALD Cited by: plasma composition, in a change of the plasma impedance. If one keeps the discharge current constant, this change of the plasma impedance expresses itself in a discharge voltage change.

Whether the voltage increases or decreases with regard to the discharge voltage in metallic mode depends on the target material [3]. Suppression of runaway electron generation by massive helium injection after induced disruptions on TEXTOR - Volume 81 Issue 5 - A. Lvovskiy, H.

Koslowski, L. Zeng, The TEXTOR TeamCited by: 2. Low-density polyethylene (LDPE)/ZnO composites were prepared using melt mixing process.

ZnO powder with size of 44 nm was used as reinforcing particle. The electron beam irradiation effects on the dielectric behaviour of a polymer nanocomposite dielectric made of low density polyethylene filled with nanoparticles of ZnO were studied.

The dielectric constant and dielectric loss values were Author: Deepu Thomas, Deepu Thomas, Simon Augustine, Jithin Prakash.The Effect of Plasma on Graphene Quality in an Inductively Coupled Plasma Chemical Vapor Deposition Reactor Brendan Coyne 1, Otto Zietz, and Dr.

Jun Jiao1,2 1Department of Mechanical and Materials Engineering, 2Department of Physics, Portland State University Results continued Figure 3 (a‐b) show a chart summarizing the Raman peak ratios and the spectra forAuthor: Brendan Coyne.IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL.

42, NO. 10, OCTOBER Gliding Arc in Noble Gases Under Normal and Hypergravity Conditions Lucia Potoˇcˇnáková, Jiˇrí Šperka, Petr Zikán, Jack J.

W. A. van Loon, Job Beckers, and Vít Kudrle Abstract—This paper .