SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Three ground-based single-beam detectors determine wind vectors present within a given volume. Winds approximately constant near a selected height, blowing into or out of a 90 degree arc can be calculated with reasonably small error.
Random processes in daily variations of geomagnetic vector during summertime quiet days by statistical investigations
Shock absorption and wind effects on human tolerance to acceleration stress during spacecraft landing
Exercise effects on bone density and calcium balance of humans during prolonged bed rest
Limb radiance calculation model for atmospheric carbon dioxide bands with pressure and temperature gradients
Explore the source record for details and available documents.
Mathematical model for vestibular nystagmus adaptation to subjective sensation of rotation, noting time constants
Vestibular sinusoidal stimulation effects on compensatory tracking under various postures and display conditions
Low speed longitudinal, directional, and lateral static stability characteristics of straight wing orbiter during configuration build-up
Atmospheric structure effects on muons zenith angle distribution and maximum intensity direction as function of energy at two different altitudes
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Computer program is written to display Nimbus high resolution infrared radiometer data in optimum form for experiment usage. Program produces three maps for Nimbus experimental data. Functions of program are to process data and prepare print maps from modified temperature measurements.
The nature of the pseudohorizontal branch in the galactic cluster M67 is investigated. A differential technique is used to determine the masses of these stars relative both to the turnoff-point stars and to the zero-age main sequence. The results obtained suggest that the pseudohorizontal-branch stars are analogs of the blue stragglers found in other galactic clusters.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Interference patterns for electromagnetic fields due to a subsurface reflector below a layered lossy dielectric are calculated with the geometrical optics approximation for use in interpreting data to be collected on the moon by Apollo 17 as well as data currently being obtained on terrestrial glaciers. The radiating antenna lies on the surface. All six field components are calculated and studied. For the endfire solutions, the peak of the first reflected wave is found to be different from that of the broadside ones. To facilitate a physical discussion, we plotted the radiation patterns due to the antenna on the surface.
Constant boundary conditions at 120 km have been so widely and successfully used in atmospheric modeling and in fitting atmospheric density data obtained from satellite drag to models that attention has been diverted from the variations that occur at 120 km, especially in composition. Atomic oxygen concentrations vary by factors as large as 4, with highest concentrations occurring in the winter hemisphere but at midlatitudes rather than over the polar region. A substantial additional degree of variability occurs that is especially associated with geomagnetic activity. The helium concentration varies by about an order of magnitude between poles, with the maximum concentration occurring at high winter latitudes and a secondary minimum occurring over the winter pole.