Shock jump conditions for an anisotropic plasma.
Finite discontinuity jump conditions for plasma in strong magnetic field determined by approximation and Maxwell equation, noting possible application to satellite data
APPROXIMATION METHOD↗
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Results for “Approximation methods”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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An iteration method in the problem of approximating functions from a finite number of observations ob odnom iteratsionnom metode v zadache approksimatsii funktsii po konechnomu chislu nablyudeniy
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Litvakov, B. M.↗
An approximate MO-LCAO-SCF method including overlap
Molecular orbital method based on atomic self consistent field functions and applicable where pi electron restrictions not fulfilled
Manne, R.↗
An approximate analytic solution of the steady- state thermal design problem of space radiators.
Space radiator steady state thermal design using approximate analytic method
Chapman, A. J.↗
An analysis scheme for suboptimal, minimum- time, sampled-data systems.
Sampled data system minimum time suboptimality measurement, proposing approximate analysis method for pulse amplitude modulated systems
Pokoski, J.↗
Computation and analysis
Direct summation of series involving higher transcendental functions, integrals of confluent hypergeometric functions, and computer methods for approximating continuous functions
Source record↗
A polynomial method for determining local emission intensity by Abel inversion
Polynomial method for approximating radiation intensity from plasma light source represented by Abel transforms
Moore, D.↗
The variational method 2 - Perturbation theory
Variational method to approximate solutions of perturbation equations, perturbation analyses, and use of perturbation theory to infer variational principle
Epstein, S. T.↗
Analysis of irrational transfer functions for distributed-parameter systems
Algorithmic and digital computer method for approximating irrational transfer functions by rational functions in control systems
Chen, C.-F.↗
Multiple zeros of polynomials
Analysis of four iterative methods for approximating zeros of polynomial expressions using digital computer
Wood, C. A.↗
Communication system modeling
This report presents the results of work on communications systems modeling and covers three different areas of modeling. The first of these deals with the modeling of signals in communication systems in the frequency domain and the calculation of spectra for various modulations. These techniques are applied in determining the frequency spectra produced by a unified carrier system, the down-link portion of the Command and Communications System (CCS). The second modeling area covers the modeling of portions of a communication system on a block basis. A detailed analysis and modeling effort based on control theory is presented along with its application to modeling of the automatic frequency control system of an FM transmitter. A third topic discussed is a method for approximate modeling of stiff systems using state variable techniques.
Holland, L. D.↗
Prediction of flow profiles in arteries from local measurements.
This paper develops an approximate numerical method for calculating flow profiles in arteries. The theory takes into account the nonlinear terms of the Navier-Stokes equations as well as the large deformations of the arterial wall. The method, assuming axially symmetric flow, determines velocity distribution and wall shear at a given location from the locally measured values of the pressure, pressure gradient, and pressure-radius relation. The computed results agree well with the corresponding experimental data.
Ling, S. C.↗
Effects of interplanetary magnetic field on the propagation of flare-generated interplanetary shock waves.
The effects of an interplanetary magnetic field on the propagation of flare-generated interplanetary shock waves are investigated with an approximate analytical method. It is found that the interplanetary magnetic field is relatively unimportant for strong shocks as far as the shock speed and transit time are concerned. It has more significant effects for weak shocks. However, in all the situations examined, the error committed if the magnetic field is neglected is no more than 10%. It is suggested that a model without a magnetic field gives sufficiently accurate numerical results for the propagation of flare-generated shocks.
Tam, C. K. W.↗
Welded printed circuit (pc) stick
Printed-circuit stick module has reduced comb technique to six steps, cutting process time by approximately 50%. Method incorporates all type of components into one assembly. It reduces design and fabrication time for 14-lead flat pack to less than four hours and for the 22-lead flat pack to four hours. Average weight of each flat pack is also reduced to 2 g.
Kreis, F.↗
Analysis of unsteady thermal boundary layers
The velocity and temperature distribution in an unsteady thermal boundary layer is analyzed by an approximate integral method. The case of a flat plate in a free stream having small harmonic velocity oscillations about a steady mean value is treated in detail. The resulting velocity profiles agree with the available experimental data. These profiles are used to predict the thermal convection when the plate and the stream are at constant but different temperature levels. The flow oscillations cause harmonic temperature oscillations plus a small steady feedback effect which reduces the mean heat transfer to the plate. The amount of decrease is represented by a single coefficient, which is presented graphically.
Miller, R. W.↗
Control optimization, stabilization and computer algorithms for aircraft applications
Computationally useful algorithms are considered that can aid the control engineer in designing systems control in linear time invariant dynamics for aircraft applications. Structural aspects of system identification, matrix parameterization, and the effect of feedback on identifiability of systems. Adaptive and stochastic control model constructions are projected, and a method for approximate identification of aircraft characteristics and subsequent generation of control signals is outlined.
Mitter, S. K.↗
A nonlinear analysis of pulsatile flow in arteries.
An approximate numerical method for calculating flow profiles in arteries is developed. The theory takes into account the nonlinear terms of the Navier-Stokes equations as well as the nonlinear behaviour and large deformations of the arterial wall. Through the locally measured values of the pressure, pressure gradient, and pressure-radius function, the velocity distribution and wall shear at a given location along the artery can be determined. The computed results agree well with the corresponding experimental data.
Ling, S. C.↗
Optical Properties of atmospheric dust from twilight observations
Three methods of approximation are described and used to separate the primary twilight brightness from the observed brightness. Photoelectric observations obtained are combined with observations from a balloon and from the observatory to derive the atmospheric scattering phase functions of 0.37 micron and 0.58 micron as a function of height. Comparison of these data with data for a Rayleigh atmosphere provide information on the optical properties of dust in the upper atmosphere.
Divari, N. B.↗