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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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At least 109 records · Page 6
All sourcesNASA NTRSDOE OSTI
NASA NTRS1970

The hydrolysis of proteins

Proteins hydrolysis, investigating temperature effect on reaction, determining optimum conditions for maximum amino acids yields

Gehrke, C. W.↗
NASA NTRS1972

Development of a theory of the spectral reflectance of minerals, part 3

Significant refinements were made in the theory of the diffuse reflectance of particulate media. The theory predicts the opposite trends of reflectance with particle size in regions of the spectrum in which the particles are semi-transparent and those in which they are opaque. Enhanced absorption caused by wave-optical effects of small surface asperities and edges was used to improve the theory. The same mechanism remedies the theory to account for the data in spectral regions of anomalous dispersion.

Aronson, J. R.↗
NASA NTRS1972

A comparison of surface brightness measurements from OAO-2 and OSO-6

A comparison of surface brightness measurements of the night sky from the OAO-2 and OSO-6 satellites with ground observations shows good agreement between the space experiments but a systematic error in the zero point of the ground observations, indicating an additional atmospheric source of radiation.

Roach, F. E.↗
NASA NTRS1972

Ash content of bones in the pigtail monkey, Macaca nemestrina.

Ash analyses of skeletons of four adult primates, Macaca nemestrina, revealed some similarities and some marked contrasts when compared with published data on human skeletal ash. The skull in both Macaca nemestrina and man has the highest ash content of all bones in the skeleton. While the bones of the arms of humans have an ash content nearly identical to that of the legs (0.3% difference), in Macaca nemestrina the humeri and radii contain 5.4% more ash than the femora and tibiae. Similarly in Macaca nemestrina the bones of the hands contain 3.5% more ash than the bones of the feet, while in humans the same bones agree within 0.3% implying that adaptive use function is a factor in bone ash concentration. The ribs of Macaca nemestrina showed an unexpectedly high ash content in comparison with those of humans. In contrast with the relatively constant ash content throughout the vertebrae in humans, a conspicuous decrease axially was noted in Macaca nemestrina.

Vose, G. P.↗
NASA NTRS1972

Surface photometry of celestial sources from a space vehicle - Introduction and observational procedures.

Consideration of the possibility of studying diffuse celestial sources of relatively low surface brightness such as the Milky Way, zodiacal light, and gegenschein from above the earth's atmosphere with equipment flown in artificial satellites. The techniques used for this purpose are reviewed, and some of the difficulties encountered in daytime observations from satellites by the use of a special photometer and polarimeter flown in the orbiting skylab observatory, OSO-6, are cited.

Roach, F. E.↗
NASA NTRS1972

Observations of the diffuse galactic light.

Systematic observations during five nights were made with a field of 137 arc seconds at a fixed declination of 20 deg 42 min through one arm of the Milky Way over a range of right ascension from 257 to 336 deg. Corrections for zodiacal light, airglow, and integrated starlight leave a residual which is interpreted as the diffuse galactic light. The residual, plotted against galactic latitude, suggests that the diffuse light in the sample studied emanates from several discrete sources.

Roach, F. E.↗
NASA NTRS1973

GRAN experiment

A global system for search and rescue was studied to reduce the time lost between a mishap and rescue efforts. The sequence of the GRAN concept proceeds as follows: (1) A distress call is initiated by a survivor and consists of the retransmission of Omega tones and a unique identifying code. (2) Signals are frequency translated through the satellite from UHF to SHF. (3) The received signals are processed in real-time using improved skywave correction and lane ambiguity techniques. The results are processed in geographical coordinates, time of day, and unique ID. This information is then relayed to the closest rescue agent. The Omega system is described, and the satellite/GRAN compatibility is discussed. The program plan and schedule are included.

Morakis, J. C.↗
NASA NTRS1972

A photometric model of the zodiacal light.

An intercomparison of published photometric investigations of the zodiacal light and gegenschein is made, leading to a compilation of brightnesses over the entire sky in a reseau with 5-deg intervals. The results are given in absolute units. Several graphical representations illustrate the compilation.

Roach, F. E.↗