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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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Transform for hydrogen ion exchange perturbation problem, involving first order partial differential equations and method of characteristics
Spacecraft electric power transformation and control techniques enhancement, using DC to DC converter, voltage converter/regulator and solar array reorientation system
Symmetric sparse matrices transformation to triple diagonal form, giving algorithms for nonzero elements growth minimization
Fast transformations algorithm for generalized spectral analysis
Recursive triangular algorithm for Lie transformation from introduction of small parameter into generating function and Hamiltonian
Multispectral and multitemporal digital imagery spatial registration using fast Fourier transform techniques, applying to earth resources satellite imagery preprocessing
Orthogonal transforms and feature selection using pattern, Harr, Walsh, Fourier and Karhunen- Loeve spaces for providing efficient classification algorithms in pattern recognition
Image data coding by linear transformation and block quantization, considering Fourier, Hadamard and Karhunen-Loeve methods
WKB wave functions for one dimensional nonrelativistic problems by simple transformation derivation, solving by application of Liouville substitution to Schroedinger equation
Hill-Brown differential equations for satellite coordinates transformed for integration with analytical programming language
Explicit recursive algorithms for construction of Lie and von Zeipel transformations
Brans-Dicke gravitation theory, applying units transformation to field equations
Potential function transformation under coordinate rotations, deriving coefficients for Laplace equation series expansion
Three phase code transformation task reliability and correlation, representing general/factor analytic intellectual abilities and personality characteristics
Geophysical cartesian coordinate system transformation, using vector-matrix formalism
Vehicle attitude determination and guidance sensor orientation by vector space matrix method, minimizing errors by weighted least squares affine transformation technique
A computer program is described capable of determining the properties of a compressible turbulent boundary layer with pressure gradient and heat transfer. The program treats the two-dimensional problem assuming perfect gas and Crocco integral energy solution. A compressibility transformation is applied to the equation for the conservation of mass and momentum, which relates this flow to a low speed constant property flow with simultaneous mass transfer and pressure gradient. The resulting system of describing equations consists of eight ordinary differential equations which are solved numerically. For Part 1, see N72-12226; for Part 2, see N72-15264.
A new type of interferometer for use in Fourier spectroscopy has been devised at the Aime Cotton Laboratory of the National Center for Scientific Research (CNRS), Orsay, France. With this interferometer and newly developed computational techniques, interferograms comprising as many as one million samples can now be transformed. The techniques are described, and examples of spectra of thorium and holmium, derived from one million-point interferograms, are presented.