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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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Multivariable least squares approximation polynomials and transcendental function problem solving for missile trajectories
Sudden approximation applied to computation of rotational transition probability and inelastic total cross sections for scattering of polar and nonpolar diatomic molecules by atoms
Errors from geometric approximations of three computational models for space vehicle electron dose prediction
Closed-loop approximately time optimal control of linear systems based on eignevector scalar product solutions to Hamilton-Jacobi equation
Stability boundary approximations for relay- control systems via steepest-ascent construction of Liapunov functions
Atomic dipolar spectral distribution function in statistical approximation derived from dynamic equations, describing atom density fluctuations induced by external field
Gauge invariance of Hartree-Fock approximation in presence of nonlocal potentials
Higher order stationary-phase approximations in calculating corrections to classical differential cross section for elastic scattering
Where a function of several variables is given numerically in tabular form, an orthonormalization technique allows an approximation of the numerical data to be determined in a convenient functional form. In this technique, the speed and accuracy of coefficient computation are much improved.
Rational approximations to solution of second order nonlinear Ricatti equation, using linear transformations - differential equations and operational calculus
Coupled Hartree-Fock approximation for calculating frequency-dependent refractive index of helium gas
Linear transformation to obtain rational approximation to response of physical system described by nonlinear differential equation including Duffing equation as special case
Proton detection of approximately 500 KeV kinetic energy by Mariner IV Space Probe during interplanetary flight
Transfer function approximations for large highly coupled flexible body launch vehicles with liquid fuel slosh
Curtis-Gordon approximation in calculations of radiant heating by inhomogeneous hot gases
Simplified and generalized geometrical proof of Kupka and Smale approximation theorem concerning differential equations defined on closed, compact, infinitely differentiable manifold
Approximate analytical solution for motion of arbitrary rotating spacecraft with variable disturbance functions
Approximation of reentry angles of attack for spinning body from rate-gyro and accelerometer data