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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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Pure ammonium perchlorate single crystal self deflagration, determining energy transfer mechanisms from pressure effects, combustion characteristics and subsurface profile
Pressure effects on quantum yields of carbon trioxide formation in gas phase ozone photolysis with carbon dioxide
Two dimensional hypersonic viscous flow, analyzing viscosity and bluntness induced pressure effects
Thermal conductivity of particulate basalt as function of density in simulated lunar and Martian environments, noting temperature and pressure effects
Spacecraft wet oxidation for human waste processing, discussing temperature and gas pressure effects, catalyst types, pump requirements, etc
Silver fluorination kinetics, taking temperature and pressure effects into account
Shell of revolution /pressure vessel/ with meridional slope discontinuity, calculating pressurization effect on stresses by computer program
Pressure effects on high temperature vibrational absorption coefficients for atomic hydrogen collisions in hydrogen gas
Ni-Fe alloy films composition gradients produced by W boats evaporation, noting vapor pressures effect
Solid propellant engine structural analysis, examining transient thermal loading and internal pressure effects
Reaction heat for flameless combustion of double- base propellant using differential scanning calorimetry and thermogravimetric analysis, noting pressure effects
Stationary Gaussian Markovian form randomly fluctuating pressure gradient effects on steady incompressible channel flow velocity
Acoustic liner design for propellant combustion instability and jet aircraft noise suppression, discussing cross flow and oscillatory pressure effects
Longitudinal edge stiffness and internal pressure effects on buckling and initial postbuckling behavior of axially compressed stringer reinforced cylindrical panels, discussing imperfection sensitivity
Photographic study of acceleration and pressure effects on Al agglomerates and combustion processes on solid propellant surface, describing pit growth by combustion model
The inner perturbing forces acting on sensors were analyzed, taking into account the technological limitations imposed on the proof mass position pickup and proof mass acquisition system. The resulting perturbing accelerations are evaluated as a function of the drag-free sensor parameters. Perturbations included gravitational attraction, electrical action, magnetic action, pressure effects, radiation effects, and action of the position pickup. These data can be used to study the laws of guidance, providing an optimization of the space probe as a whole.
The initial stages of the research were involved with a test of Burch's law of multiplicative transmittance for mixed absorbing gases when their lines are broadened by H2 and He, which are constituents of the atmospheres of the major planets. The broadening of individual lines in the CO fundamental by various gases was investigated. Line strength and half-width for individual CO lines were studied as a function of temperature. Measurements of total band absorptance as a function of absorber thickness and total effective pressure were made at various temperatures for bands of CO and N2O. Attempts were made to develop a phenomenological theory of line broadening that would account for the phenomena observed for the CO fundamental and those reported for more highly polar gases. Laboratory measurements of nitric acid vapor absorptance were compared with balloon measurements in arriving at an estimate of the quantity of nitric acid vapor present in the earth's atmosphere in the region of the ozone layer.
Study of zirconium oxidation kinetics for maximum exposure times of 3 min and in the temperature range 440 to 850 C. 'Discontinuous' oxidation runs were employed whereby a specimen was inserted into the gas stream for a predetermined time, removed and weighed, and reinserted into the oxidation atmosphere. It is considered that the increase in the observed activation energy for the early stage parabolic oxidation is a manifestation of a change from an n-type oxide to a predominantly p-type oxide, in agreement with the authors' earlier conclusion (1971) based on pressure effects.