3 edition of Microanalysis of extended-test xenon hollow cathodes found in the catalog.
Microanalysis of extended-test xenon hollow cathodes
by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va
Written in English
|Other titles||Microanalysis of extended test xenon ....|
|Statement||Timothy R. Verhey and Michael J. Patterson.|
|Series||NASA technical memorandum -- 104532.|
|Contributions||Patterson, Michael J., 1955-, United States. National Aeronautics and Space Administration.|
|The Physical Object|
Xenon, for example, has 54 protons and 70 neutrons. In double electron capture, two protons in the nucleus simultaneously “catch” two electrons from the innermost atomic shell, transform into two neutrons, and emit two neutrinos. The other atomic electrons reorganize themselves to fill in the two holes in the innermost shell. The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University. OpenStax is part of Rice University, which is a (c)(3) nonprofit charitable corporation.
Microbiology is a fascinating subject. Some of my favorite books during student life and life as a lecturer of Microbiology. SOME OF MY FAVORITES. 1. Bailey & Scott’s Diagnostic Microbiology– Recommendation: All level. RS – Lecture 12 6 • Heteroscedasticity is usually modeled using one the following specifications: H1: σt2 is a function of past εt 2 and past σ t 2 (GARCH model).-H2: σt2 increases monotonically with one (or several) exogenous variable(s) (x1,,, xT).-H3: σt2 increases monotonically with E(y t).-H4: σt2 is the same within p subsets of the data but differs across the.
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Extended Testing of Xenon Ion Thruster Hollow Cathodes Timothy R. Sarver-Verhey Sverdrup Technology GrouJt NASA Lewis Research Center Brook Park, OB A hollow cathode wear-test of 50s hours was successfully completed at an emission current of A and a xenon flow rate of Get this from a library.
Microanalysis of extended-test xenon hollow cathodes. [Timothy R Sarver-Verhey; Michael J Patterson; United States. National Aeronautics and Space Administration.].
Four hollow cathode electron sources were analyzed via boroscopy, scanning electron microscopy, energy dispersive x ray analysis, and x ray diffraction. Get this from a library. Extended test of a xenon hollow cathode for a space plasma contactor. [Timothy R Sarver-Verhey; United States.
National Aeronautics and Space Administration.]. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA The hollow cathodes used in these experiments were operated with constant current, so an increase in work function due to poisoning results in higher operating temperatures.
The long-term effects of oxygen exposure indicate that there is a mechanism for emitter degradation with a characteristic time scale of tens to hundreds of hours at ppm. Ba 2 CaWO 6 is used for activation of tungsten cathodes in high pressure discharge lamps, T.
Verhey“Microanalysis of Extended-Test Xenon Hollow Cathodes,” AIAA Paper () Google Scholar. Sarver-Verhey“Destructive Evaluation of a Xenon Hollow Cathode After a 28, Hour Life Test,” AIAA Paper ().
A 30 cm diameter xenon ion thruster is under development at NASA to provide an ion propulsion option for missions of national interest and it is an element of the NASA Solar Electric Propulsion.
A 30 cm diameter xenon ion thruster is under development at NASA to provide an ion propulsion option for missions of national interest, and is being proposed for use on the USAF/TRW Space. atmospheric-pressure hollow cathodes. IEEE Transactions on Plasma Science, 35(3), IV D.
Söderström, H. Baránková, and L. Bárdoš. Space-charge sheaths in atmospheric pressure hollow cathodes. Proceedings of the 16th Symp.
on Applications and Plasma Processes on Plasma Processing (SAPP XVI). Podbanské, Slovakia. January P69, pp. Continuing Life Test of a Xenon Hollow Cathode for a Space Plasma Contactor Timothy R.
Sarver-Verhey NYMA,lnc. Engineering Services Division Brook Park, Ohio Implementation of a hollow cathode plasma contactor for charge control on the Space Station has required validation of long-life hollow cathodes. Typical SEM/EDS microanalysis practice. Despite the level of analytical accuracy demonstrated for the EDS k-ratio/matrix corrections protocol and the availability of this procedure within most commercial implementations of EDS analytical software, modern SEM/EDS microanalysis practice has developed along a different trajectory that minimizes the need for the user’s expertise.
Microhollow cathode discharges are high-pressure, nonequilibrium gas discharges between a hollow cathode and a planar or hollow anode with electrode dimensions in the μm range. The large concentration of high-energy electrons, in combination with the high-gas density favors excimer formation. Excimer emission was observed in xenon and argon, at wavelengths of and nm.
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Pathfinder software processes incoming data from the latest X-ray detector technology in novel and efficient ways, dramatically reducing analysis time from hours to minutes. Contents ix Dc arc spectrometry Ac arc spectrometry Spark emission spectrometry Sparks Analytical features Plasma source AES Dc plasma-jet AES Types of plasma jets Three-electrode plasma jet Inductively coupled plasma AES The inductively.
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Such testing is used for product safety, to look for signs of contamination in products that will be sold to the public, and for .Considerable departures from the classical Paschen's curve for pd lower than Torr cm in microhollow cathodes with D = μm and electrode spacing of 5 μm and 20 μm in air were observed.
Fowler-Nordheim approach was employed to characterize the presence of field emission of electrons which modify the classical voltage versus current.