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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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Computer program to solve heat conduction equation in lunar surface for temperature-dependent thermal properties
Lunar surface models including temperature dependent thermal properties
Temperature dependent thermal property models of lunar surface and radiative energy transport deduced from RF and IR observations
Hyperfine coupling constants of positive divalent Mn ion in calcium and barium fluorides, measuring temperature dependence by analyzing electron spin resonance spectrum
Temperature dependent isomer shift and anharmonic binding of Sn 119 in niobium stannide, measuring Mossbauer recoil free fraction
Theory of temperature dependent magnon energies in antiferromagnets based on spin wave operator expansion of Hamiltonian, taking into account dynamical interaction between waves
Temperature dependence of diffusion coefficient for carbon dioxide filled rigid polyurethane foam, using Fick law
Magnon energy theory for temperature dependence of ferrous and magnesium fluorides antiferromagnetic- resonance frequency, sublattice magnetization and magnetic specific heat
Thermal conductivity of multilayer and mixed powder high temperature insulation systems over wide temperature range and vacuum conditions
Liquid crystal smectic C phase temperature dependent tilt angle, using conoscopic observation and circularly polarized light
Fe 57 nuclear hyperfine splittings in clinopyroxenes from lunar igneous rocks, determining temperature dependent cation distribution
Temperature dependent extracavity and intracavity etalon effects in optical materials for carbon dioxide lasers
Compact, lightweight temperature transducer requires no amplification of its output signal and is time stable. It uses the temperature-dependent characteristics of a silicon transistor to provide a zero-to-five-volt signal proportional to temperature.
Temperature-dependent thermoconductivity of metal film on insulation laminations in relation to bulk parent material in insulation systems of cryogenic propellants
Proton radiation effects on mirror reflectance in high vacuum at various temperatures, degradation by blistering found to be highly temperature-dependent
Liquid-level indicator, consisting of a diode heated by a resistor, allows simultaneous use of two or three of the liquids nitrogen, hydrogen, and helium. Operation depends on strong temperature-dependence of the forward resistance of a germanium diode and the difference between liquid and vapor in heat-transfer properties.
Testing technique permits accurate measurement of temperature-dependent thermal conductivity, by virtue of the small temperature differential required across a specimen. The permissible mean insulation temperature ranges from cryogenic to 10 degrees F for the insulation under test.
A dislocation theory of fatigue failure for annealed solid solutions is presented. On the basis of this theory, an equation giving the dependence of the number of cycles for failure on the stress, the temperature, the material parameters, and the frequency is derived for uniformly stressed specimens. The equation is in quantitative agreement with the data. Inasmuch as one material parameter is indicated to be temperature-dependent and its temperature dependence is unknown, it is impossible to predict the temperature dependence of the number of cycles for failure. A predicted quantitative correlation between fatigue and creep was found to exist, which suggests the practical possibility of obtaining fatigue data for annealed solid solutions and elements from steady-state creep-rate data for these materials. As a result of this investigation, a modification of the equation for the steady-state creep rate previously developed on the basis of the dislocation theory is suggested. Additional data are required to verify completely the dislocation theory of fatigue.