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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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Differential dynamic programming to develop second order and first order approximation methods for determining optimal control
Approximate methods for predicting viscosities of gas mixtures involving both polar and nonpolar gases
Approximate method for synthesis of flight trajectories around moon
Approximation method for calculating spanwise distribution of wind tunnel boundary interference on wing lift in rectangular perforated wall
Approximation methods for predicting power at onset of antenna breakdown at high altitudes
Emission-power series expansion solution and Rosseland approximation applied to radiation problems, discussing errors introduced by approximate methods
LF component electric microfield distributions in plasmas at neutral and charged point, discussing approximations method
Approximate method to predict ablative recession rate and mass loss on sphere cones in Martian atmosphere entry
Two methods calculate the volume of a thermodynamic system. Integral method uses an iterative solution to determine volume based on constants of liquid mass and gas mass. Differential method approximates volume by its initial values plus first-order differential changes in volume as functions of temperature and pressure.
Second normal stress difference measurement by annular flows, giving approximate method for experimental data inversion
Orbits computation by Picard successive approximations method, discussing iterative numerical perturbation techniques
Robbins-Monro stochastic approximation method using algorithms for identifying finite memory time-discrete time-stationary linear system from noisy input-output measurements
Rotational excitation and scattering of diatomic molecules by structureless atoms, comparing approximation methods
Axisymmetric radiating flow behind paraboloidal shock in ideal inviscid gas hypersonic stream, using differential approximation method for blunt body solution
Complex error function computation using approximation method with single algorithm
Sound radiation from unflanged circular waveguide duct with flow, calculating reflection coefficients, directivity pattern and power for comparison with approximate methods
Approximation method for structural beam and plate resonances at elastic edge excitations
Approximative method for predicting motion of symmetric rigid body subjected to body-fixed force