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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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Empirical analysis of maximum wind speeds in space vehicular dynamic pressure region over Cape Kennedy for Apollo and AAP launches
Smooth empirical Bayes estimation with application to Weibull distribution
Empirical converter surface physics formulation for electron emission current density analysis on cesiated metal surface
Empirical technique for computing navigation covariance matrices and applications to post Apollo 8 lunar orbit mission planning
Empirical correlation of small hollow sphere impact failure data using dimensional analysis
Kalman filter set for state vector and observation error variance estimation in discrete- time linear system, using empirical Bayes techniques
Empirical approach to third-invariant violation for radial diffusion of outer zone electrons
Empirical equation for thermionic converter performance as function of electrode emission properties
Empirical solar photosphere continuum models, calculating temperature distribution for absolute intensities at center and limb darkening ratios
Sunspot umbra empirical model, deriving temperature and optical depth relationship from IR continuous limb darkening
Service life testing and reliability estimation, using ordinary and empirical Bayes approach in failure model with gamma probability distribution
Thermosphere and exosphere static models with empirical thermal profiles, giving temperature, density and composition as function of height
Linear dynamic systems state estimation, using empirical Bayes decision theory to develop filter set
Empirical correlation of high energy electrons into materials allows predictions of practical ranges (measure of electron penetration) for different elements and alloys.
An empirical orbit determination method is shown to yield highly accurate navigation results when applied to lunar orbit tracking data. Regressions and predictions of free flight Apollo 14 tracking data exhibit minimal residual growth, and the solution orbital elements behave in a very consistent manner. Solutions from data acquired during propulsive maneuvers result in degraded predictions. The residual patterns from free flight processing are shown to be consistent from pass to pass and are correlated with lunar topographic features.
The empirical data used in the 1969 Smithsonian Standard Earth (2) are presented. The variance-covariance matrix, or the normal equations, used for correlation analysis, are considered. The format and contents of the matrix, available on magnetic tape, are described and a sample printout is given.
A smooth empirical Bayes estimator was developed for estimating the unknown random scale component of each of a set of observation error variances. It is shown that the estimator possesses a smaller average squared error loss than other estimators for a discrete time linear system.
The relation between dissipation and temperature structure in the lower corona was empirically determined. This relation was then used in conjunction with the observed structure to estimate the damping length for mechanical waves.