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  • Other Sources  (6)
  • 1
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    Photoionization of sodium atoms and electron scattering from ionized sodium (1985)
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    Publication Date: 2011-08-19
    Description: The polarized-orbital method of Temkin (1957) is applied using polarized orbitals determined from Sternheimer's equation to compute the photoionization cross sections of Na atoms from threshold to about 60 eV. The approximations involved in the analysis are explained in detail; the explicit forms of the integrals and matrix expressions are given in appendices; and the results are presented in tables and graphs. Good agreement is found with the results of Chang and Kelly (1975), and the possibility that small amounts of molecular vapor in Na-photoionization experiments are responsible for the discrepancies between calculated and measured cross sections is considered.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 31; 759-771
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  • 2
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    Scattering of electrons from neon atoms (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Scattering of electrons from neon atoms is investigated by the polarized-orbital method. The perturbed orbitals calculated with use of the Sternheimer approximation lead to the polarizability 2.803 a(0)-cube in fairly good agreement with the experimental value 2.66 a(0)-cube. Phase shifts for various partial waves are calculated in the exchange, exchange-adiabatic, and polarized-orbital approximations. They are compared with the previous results. The calculated elastic differential, total, and momentum-transfer cross sections are compared with the experimental results. The polarized-orbital approximation yields results which show general improvement over the exchange-adiabatic approximation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 30; 1241-124
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  • 3
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    Role of failure-mechanism identification in accelerated testing (1993)
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    Publication Date: 2019-08-28
    Description: Accelerated life testing techniques provide a short-cut method to investigate the reliability of electronic devices with respect to certain dominant failure mechanisms that occur under normal operating conditions. However, accelerated tests have often been conducted without knowledge of the failure mechanisms and without ensuring that the test accelerated the same mechanism as that observed under normal operating conditions. This paper summarizes common failure mechanisms in electronic devices and packages and investigates possible failure mechanism shifting during accelerated testing.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: IES, Journal (ISSN 1052-2883); 36; 4; p. 39-45.
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  • 4
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    Noniterative implicit method for tracking particles in mixed Lagrangian-Eulerian formulations (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The existing implicit methods for the current initial value problems (IVPs) concerning particle-laden flows are complicated and iterative in nature. This paper presents a noniterative implicit method which can be used with pressure-based as well as with density-based algorithms. The method is illustrated by analyzing a dilute dispersion of noninteracting solid particles in an isothermal flow in a passage bounded by one straight wall and one wavy wall, in which all particles are spherical and have a finite velociy relative to the continuum phase at the inflow boundary.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 31; 4; p. 782-784.
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  • 5
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    Computations of spray, fuel-air mixing, and combustion in a lean-premixed-prevaporized combustor (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A code was developed for computing the multidimensional flow, spray, combustion, and pollutant formation inside gas turbine combustors. The code developed is based on a Lagrangian-Eulerian formulation and utilizes an implicit finite-volume method. The focus of this paper is on the spray part of the code (both formulation and algorithm), and a number of issues related to the computation of sprays and fuel-air mixing in a lean-premixed-prevaporized combustor. The issues addressed include: (1) how grid spacings affect the diffusion of evaporated fuel, and (2) how spurious modes can arise through modelling of the spray in the Lagrangian computations. An upwind interpolation scheme is proposed to account for some effects of grid spacing on the artificial diffusion of the evaporated fuel. Also, some guidelines are presented to minimize errors associated with the spurious modes.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-2069 , AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference and Exhibit; Jun 28, 1993 - Jun 30, 1993; Monterey, CA; United States|; 13 p.
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  • 6
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    Scintillations associated with bottomside sinusoidal irregularities in the equatorial F region (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Multisatellite scintillation observations and spaced receiver drift measurements are presented for a category of equatorial F region plasma irregularities characterized by nearly sinusoidal waveforms in the ion number density. The observations were made at Huancayo, Peru, and the measurements at Ancon, Peru, associated with irregularities observed by the Atmospheric-Explorer-E satellite on a few nights in December 1979. Utilizing ray paths to various geostationary satellites, it was found that the irregularities grow and decay almost simultaneously in long-lived patches extending at least 1000 km in the east-west direction.
    Keywords: GEOPHYSICS
    Type: AD-A164917 , AFGL-TR-86-0039 , Journal of Geophysical Research (ISSN 0148-0227); 91; 270-276
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