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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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New thermoelectric materials with superior transport properties at high temperatures have been discovered. These materials are part of the large family of skutterudites, a class of compounds which have shown a good potential for thermoelectric applications [1-4].
In this presentation we will discuss the performance of classification and retrieval algorithms for spaceborne cloud and precipitation radars such as the Global Precipitation Measurement mission Dual-frequency Precipitation Radar (GPM/DPR), and notional radar for the Aerosol/Clouds/Ecosystem (ACE) mission and related concepts. Spaceborne radar measurements are simulated either from Airborne Precipitation Radar 2nd Generation observations, or from atmospheric model outputs via instrument simulators contained in the NASA Earth Observing Systems Simulators Suite (NEOS(sup 3)). Both methods account for the three dimensional nature of the scattering field at resolutions smaller than that of the spaceborne radar under consideration. We will focus on the impact of non-homogeneities of the field of hydrometeors within the beam. We will discuss also the performance of methods to identify and mitigate such conditions, and the resulting improvements in retrieval accuracy. The classification and retrieval algorithms analyzed in this study are those derived from APR-2's Suite of Processing and Retrieval Algorithms (ASPRA); here generalized to operate on an arbitrary set of radar configuration parameters to study the expected performance of spaceborne cloud and precipitation radars. The presentation will highlight which findings extend to other algorithm families and which ones do not.
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Dynamic analysis of liquid in a spherical tank with applications to trajectory failure and loss of control in missile and rocket flight
High temperature ceramic rectifier, thyratrons, and voltage reference tubes for use in nuclear- electric space power systems
Portable static foam machine for life raft inflation
Development of urethane formulation and drawings of foam machine and double walled life raft
Cesium vapor diode thermionic converter - electrode surface properties, space charge neutralization, plasma studies on arc drop
High temperature ceramic thyratron tube research
Manually operated liquid fuel control valve for Advanced Liquid Propulsion System /ALPS/
Aluminum honeycomb spacecraft shielding for protection against meteoroid impact damage
Fluid wave propagation in liquid propellant feed system
Analytical method for determining axisymmetric longitudinal mode shapes and frequencies of incompressible and inviscid fluid in pressurized flexible oblate spheroidal propellant tank
Finite-amplitude free oscillations of inviscid incompressible fluid in cylindrical sector container
Effect of size and amount of NaCl filler on mechanical properties of polyurethane rubber
Time dependent small-strain modulus of styrene- butadiene rubber, noting predictability from selected molecular parameters