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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 253 records · Page 14
All sourcesNASA NTRSDOE OSTI
NASA NTRS1973

Distinguishing major lithologic types in rocks of precambrian age in central Wyoming using multilevel sensing, with a chapter on possible economic significance of iron formation discovered by use of aircraft images in the Granite Mountains of Wyoming

The author has identified the following significant results. Information obtained by remote sensing from three altitude levels: ERTS-1 (565 miles), U-2 (60,000 feet), and C-130 aircraft (15,000 feet) illustrates the possible application of multilevel sensing in mineral exploration. Distinction can be made between rocks of greenstone belts and rocks of granite-granite gneiss areas by using ERTS-1 imagery in portions of the Precambrian of central Wyoming. Study of low altitude color and color infrared photographs of the mafic terrain revealed the presence of metasedimentary rocks with distinct layers that were interpreted as amphibolite by photogeologic techniques. Some of the amphibolite layers were found to be iron formation when examined in the field. To our knowledge this occurrence of iron formation has not been previously reported in the literature.

Houston, R. S.↗
NASA NTRS1976

Discovering Jupiter. I

The current state of knowledge regarding the planet Jupiter is examined, taking into account data obtained with the aid of the spacecraft Pioneer 11. A description is given of Jupiter's weather. The Pioneer 11 pictures show that the planet's banded cloud structure breaks down above 50 deg latitude, and turns into relatively small, mostly circular cloud features in the polar regions. Attention is given to Jupiter's heat balance, aspects of internal heat flow, questions of atmospheric circulation, the turbulence in Jupiter's atmosphere, the effects of coriolis forces, Jupiter's upper atmosphere, the Great Red Spot, and the Jovian magnetosphere and radiation belts.

Source record↗
NASA NTRS1977

Discovering Jupiter. II

Data derived from Pioneer 10 and Pioneer 11 and other sources on the Jovian magnetosphere, the circum-Jovian radiation belts, and Jupiter's radio emission are presented at some length, descriptions are given of the principal Jovian satellites (Io, Europa, Ganymede, Callisto), and inferences are drawn on the origin of the planet and its place in the solar system. The inner, middle, and outer regions of the magnetosphere, the bow shock wave, and the particularly heavy intensity of the inner radiation belt region (within 1.44 million km of the planet) are discussed. All of the major satellites except Callisto lie immersed in the intense radiation belts. Jupiter's failure to become a stellar companion to the sun, Io's action in 'switching on' Jovian radio emission, and other Pioneer discoveries relating to asteroids, the solar system in general, and trans-Jovian space, are discussed

Source record↗
NASA NTRS1978

Discovering astronomy

An overview of basic astronomical knowledge is presented with attention to the structure and dynamics of the stars and planets. Also dealt with are techniques of astronomical measurement, e.g., stellar spectrometry, radio astronomy, star catalogs, etc. Basic physical principles as they pertain to astronomy are reviewed, including the nature of light, gravitation, and electromagnetism. Finally, stellar evolution and cosmology are discussed with reference to the possibility of life elsewhere in the universe.

Chapman, R. D.↗
NASA NTRS1979

Optical and X-ray properties of the newly discovered BL Lacertae object PKS 2155-304 /= H2155-304/

The soft X-ray source H 2155-304 has been precisely located with the HEAO 1 scanning modulation collimator, and identified with an object of bolometric magnitude approximately 14. The linear polarization, variability, spectrum, and diffuse image of the optical flux, together with the positional coincidence of the radio source PKS 2155-304, indicate that this object is a new member of the BL Lacertae class. Its characteristics are compared with those of other X-ray-emitting BL Lacertae objects, particularly Mrk 421.

Griffiths, R. E.↗
NASA NTRS1982

Precambrian endoliths discovered

The earliest known microborings have now been found in late Precambrian ooids (Upper Riphean/Vendian, 570-700 Myr) of the Eleonore Bay Group of eastern Greenland. The ooids were originally carbonaceous and underwent silicification after boring occurred. The finding establishes that the habit of microbial boring evolved before the appearance of skeleton-bearing metazoans in the geological record.

Campbell, S. E.↗
NASA NTRS1983

Two newly discovered S stars in a list of faint red objects

A list of 103 faint red stars in a 0.7-square-degree area located near NGC 6820/23 on the galactic plane in the constellation Vulpecula is presented. The stars were chosen from Near Infrared Photographic Sky Survey visual and near-IR photographic pairs and were selected for their visual faintness as well as their red colors. Positions, approximate magnitudes, and finding charts for these stars are presented. It is noted that two members of the list, 1548C858 and 1548C869, have already been determined to be faint, pure S stars.

Turnshek, D. E.↗
NASA NTRS1984

The role of the Automated Plate Measuring (APM) machine in developing a program to discover QSOs automatically

The scanning of a direct plate with the automatic plate measuring machine which results in the automated selection and description of images is described. The selection of QSO candidates based on color-color diagrams constructed from the APM image data and the analysis of APM raster data for QSOs selected visually from objective prism plates are also discussed.

Turnshek, D.↗
NASA NTRS1983

Microtektite discovered in Beijing

The discovery, testing, and chemical composition of tiny vitreous spheres are discussed. These spheres, found in China, are thought to be microtektites. A method for determining the age of these spheres is mentioned.

Dingrong, L.↗
NASA NTRS1984

Origin of the solar system dust bands discovered by IRAS

It is shown that distinctive longitudinal variations in thermal flux and mean latitude can be used to determine the typical orbits of the grains comprising the Solar System bands. In particular, how the bands should vary if they are debris associated with the three principal asteroid families is predicted. Based on these ideas, IRAS observations may allow discrimination between asteroidal and cometary origins of the dust bands and, perhaps, of the entire zodiacal cloud.

Dermott, S. F.↗
NASA NTRS1985

Temporal and spectral study of a newly discovered spiking phenomenon in the pre-eclipse and anomalous dip states of Hercules X-1

A new phenomenon has been detected in observations of Hercules X-1 at times consistent with the preeclipse and anomalous dips. The X-ray intensity does not drop for the duration of the dip but is punctuated by short spikes that appear to repeat with a period of approximately 108 minutes. Spectral fits during the on-state, the spike-state, and the low-state suggest a single, constant intrinsic source spectrum which becomes partially covered by an absorbing medium during the spike and low states. All three states can be fitted with the same flat power law between 1 and 20 keV with an absorber of varying covering fraction. Since the morphology and spectrum of the spikes are similar during both the preeclipse and the anomalous dips, and the possible 108 minute period is seen in both states, there is for the first time strong support for a common origin for the preeclipse and anomalous dips.

Vrtilek, S. D.↗