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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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Variational approach to structure of rotating polytrope with symmetry about axis of rotation in postNewtonian approximation of general relativity
Energy state approximation for supersonic aircraft performance optimization with extension to maximum range problems, noting comparison with complex dynamic models
Peristaltic motion of viscous incompressible fluid, applying long wave approximation to two dimensional urine flow model
Simultaneous singular integral equations approximate solution in orthogonal polynomials
Chemically reacting stagnation point boundary layers with wall injection of gas, comparing multicomponent solution with binary approximation and chemical simplifications
Normal wave propagation modes existence in magnetized plasma, deriving criteria for electrostatic approximation validity
Minimal time closed loop controller design for linear systems with bounded control amplitudes and rates using approximate functional expression
Stochastic approximation for identification of distributed parameter system solutions described by linear partial differential equations
Rocket vehicle flight optimization for model including rigid body degrees of freedom in boundary layer approximation to attitude transients
Closed form approximate solution for restricted three body motion of lunar or interplanetary spacecraft, demonstrating accuracy and flexibility in lunar mission trajectory calculations
Recursive signal detection scheme, obtaining SNR by derivative approximation
Linear reinforcement learning technique for accelerating convergence of successive approximation algorithms
Delta function approximation in diffuse transmission and reflection of light for phase function with sharp forward peak, using scattering compensation
Approximate N-representability of density matrix by set of spin geminals
Indirect method considers effect of nonlinearity and obtains approximate probability densities of certain characteristics, from these densities various statistical properties are calculated. Direct method determines response moments directly. Neither method is restricted by system motion with regard to whether or not it is stationary.
Approximate density-effect correction for ionization loss of charged particles
Accurate approximative solution to differential equations of oscillatory problem with perturbing damping
Applying generalized phase shift approach to rotational excitation problem to atom-rigid rotor case in first order approximation