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.
Initial Sr isotopic composition at time of planetary objects formation in solar system and precision measurements for age determination of basaltic achondrites
Explorer 34 observations of hydrogen and He ions in solar wind, noting number density variations and tentative association with geomagnetic storms
C13/C12 component composition from carbonaceous chondrites and terrestrial samples, showing similar fractional patterns but isotope variations
Galactic cosmic ray energy spectra of light and medium nuclei from IMP-4 satellite measurements, investigating L/M ratio
K and M star molecular constituent density calculations using model atmospheres and observations
Chemical analysis for Li, Na, K, Rb, Cs, Ca, Sr and Ba in achondrites and Apollo 11 lunar rocks, breccia and soil samples
Age determination of Apollo 11 samples from isotopic composition measurements by isotope dilution techniques, comparing to terrestrial and meteoritic values
Photometric and spectroscopic study of blue stragglers, and evolution of stars in clusters
Mass spectroscopy of lunar samples to determine uranium, thorium, and lead content
Cosmic ray spallation products and radiation age determination from spectral analysis of noble gas components in lunar rocks
Primordial radionuclides K, Th and U concentrations in Apollo 12 lunar rocks, breccias and fines, using gamma ray spectrometry
Particle accelerator radiation measurements are applied to the problem of calculating biological dose from radiation produced in the walls of a spacecraft by various ions in space. Neutrons, one of the products of the interactions of energetic ions with matter, are usually quite penetrating and have large values of Q.F. or R.B.E. Ions of helium, boron, carbon, nitrogen, and oxygen were accelerated and directed onto target materials of copper or tantalum. The secondary neutron production was determined. Studies were made of the angular distribution and an inferred neutron spectrum was calculated from activities of threshold reaction detectors.
Primordial temperature fluctuations, which appear to be necessary in order to explain aspects of galaxy formation, can lead to observable effects in some objects. In QSS and other compact systems a correlation of absolute luminosity with primordial helium content is predicted.
The composition of recent island-arc volcanic rocks in relation to their geographic and stratigraphic relations is discussed. The differences in composition between volcanic rocks and those in continental margins are pointed out. Trace elements and major elements are shown to suggest a continuous gradational sequence from tholeiites through calc-alkaline rocks to shoshonites.
Thirteen spectral scans (in the direction of increasing and decreasing wavelength) obtained with a new double-band pass monochromator system put into operation with the Michigan spectrometer at the Snow telescope at Mount Wilson are interpreted by the method of spectral synthesis. The intensity profile of the 3122.79 line, attributable to gold, is interpreted, and a representation of the solar spectrum in the neighborhood of the AU 3122.79 line is given in tabular form.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Description of 21-cm neutral-hydrogen line observations of 12 globular clusters performed with negative results by means of the NRAO 140-ft telescope. Limits on the atomic hydrogen content yielded by these observations over a range of 11 to 85 solar masses are presented.-