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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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As part of the Network for Detection of Stratospheric Change (NDSC) three lidars are currently operated by the Jet Propulsion Laboratory (JPL).
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Metal hydrides are prevalent in many catalytic reactions, and thermodynamic hydricity has emerged as a useful parameter for understanding and predicting key hydride transfer steps with these intermediates. An open circuit potentiometry method for determining the hydricity of metal hydrides with a single thermodynamic parameter is reported. The open circuit potential (OCP) of a solution containing a metal hydride and its conjugate hydride acceptor, along with a conjugate acid/base pair, is coupled with known values for the acid pK a and H + /H – reduction potential to determine the hydricity. Here, the reliability of the method was established by using potentiometry to obtain the hydricity of three hydride complexes with varying supporting ligands and transition metal elements in acetonitrile solvent, all within error of previously reported values. Advantages and drawbacks of this method are discussed, and a recommended workflow for practitioners is introduced.
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Heat transfer and pressure on a flat plate and on protuberances in a supersonic turbulent boundary layer at mach 2.65, 3.51, and 4.44
Frequency, phase, and amplitude changes of Mariner IV radio signal through atmosphere and ionosphere of Mars observed before and after planetary occulatation
Thermal radiation properties of Lexan and other space suit materials
Thermal emittance from quarter-mil aluminized Kapton space suit material and from sun and protective visors
Transient analysis for uniform RC structures using impulse excitations in open and short circuit configurations
Time dependent variations in sky emission temperature, anomalous sky temperature variation with zenith distance on calm nights, lunar linear polarization - millimeter wavelengths
For abstract, see N74-27185.
Cybernetics diagnostics of machines and mechanisms using the spectral approach is discussed. The problem of establishing the accuracy of determination of the spectral composition is investigated. In systems with rectilinear or rotary movement, the vibrations appear in the form of movement rate vibrations, which are equivalent to frequency modulation of the signal, in proportion to the mean movement rate of the body. The case of a harmonic signal which reproduces and analyzes the characteristics of the frequency modulated signal is discussed. Mathematical models are developed to show the relationships of the parameters.
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The first detailed velocity profile data on thermally induced dust vortices are presented. These dust devils will be analyzed and studied to determine their flow fields and origin in an effort to correlate this phenomena with the generation and characteristics of tornadoes. A continuing effort to increase mankind's knowledge of vortex and other meteorological phenomena will hopefully allow the prediction of tornado occurrence, their path, and perhaps eventually even lead to some technique for their destruction.
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