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Results for “theory - 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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At least 73 records · Page 4

All sources NASA NTRS DOE OSTI

NASA NTRS1966

Separate application of the membrane theory and the bending-moment theory to the calculation of shallow shells

Splitting state of stress in paraboloid or cylindrical shallow shell into membrane and bending stresses

STRESS CALCULATION↗

NASA NTRS1963

A STUDY OF SEVERAL FACTORS AFFECTING THE FLUTTER CHARACTERISTICS CALCULATED FOR TWO SWEPT WINGS BY PISTON THEORY AND BY QUASISTEADY SECOND-ORDER THEORY AND COMPARISON WITH EXPERIMENTS

Factors affecting flutter characteristics calculated for two swept wings

FLUTTER↗

NASA NTRS1964

Kinetic theory of the classical electron gas in a positive background. i - equilibrium theory.

Equilibrium parameters of electron gas in positive background

PLASMA STABILITY↗

NASA NTRS1964

Kinetic theory of the electron gas in a positive background. ii - nonequilibrium theory.

Convergent kinetic equation for electron gas in positive background, dividing Coulomb potential into short range and weak parts

ELECTRON GAS↗

NASA NTRS1967

Quantum theory of an optical maser. 3 - Theory of photoelectron counting statistics

Photoelectron counting statistics produced by fully quantum mechanical laser

Lamb, W. E., Jr.↗

NASA NTRS1965

Studies in perturbation theory. part 9 - connection between various approaches in the recent development - evaluation of upper bounds to energy eigenvalues in schroedinger's perturbation theory

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Loewdin, P.-O.↗

NASA NTRS1968

Theory of differential equations and their relationship to dynamical systems theory progress report, 1 oct. 1967 - 31 mar. 1968

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Lasalle, J. P.↗

NASA NTRS1972

Conservation laws and preferred frames in relativistic gravity. I Preferred-frame theories and an extended PPN formalism. II - Experimental evidence to rule out preferred-frame theories of gravity.

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Will, C. M.↗

NASA NTRS1975

Wave theory of turbulence in compressible media (acoustic theory of turbulence)

The generation and the transmission of sound in turbulent flows are treated as one of the several aspects of wave propagation in turbulence. Fluid fluctuations are decomposed into orthogonal Fourier components, with five interacting modes of wave propagation: two vorticity modes, one entropy mode, and two acoustic modes. Wave interactions, governed by the inhomogeneous and nonlinear terms of the perturbed Navier-Stokes equations, are modeled by random functions which give the rates of change of wave amplitudes equal to the averaged interaction terms. The statistical framework adopted is a quantum-like formulation in terms of complex distribution functions. The spatial probability distributions are given by the squares of the absolute values of the complex characteristic functions. This formulation results in nonlinear diffusion-type transport equations for the probability densities of the five modes of wave propagation.

Kentzer, C. P.↗

NASA NTRS1975