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  • Other Sources  (1,189)
  • 1980-1984  (1,189)
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  • 1
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    Molecular structure of r/GCG/d/TATACGC/ - A DNA-RNA hybrid helix joined to double helical DNA (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The molecule r(GCG)d(TATACGC) is self-complementary and forms two DNA-RNA hybrid segments surrounding a central region of double helical DNA; its molecular structure has been solved by X-ray analysis. All three parts of the molecule adopt a conformation which is close to that seen in the 11-fold RNA double helix. The conformation of the ribonucleotides is partly determined by water molecules bridging between the ribose O2' hydroxyl group and cytosine O2. The hybrid-DNA duplex junction contains no structural discontinuities. However, the central DNA TATA sequence has some structural irregularities.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Nature; 299; Oct. 14
    Format: text
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  • 2
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    Cryogenic testing of mirrors for infrared space telescopes (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Shuttle IR Telescope Facility (SIRTF) test apparatus can test candidate mirror materials as large as 66 cm in diameter, at temperatures as low as about 10 K, and is accurate enough to detect optical figure changes as small as a fraction of a wavelength from the room temperature figure. The fused silica mirrors currently undergoing testing in the SIRTF are sunk into a liquid He reservoir with copper straps, whose individual strands are soldered to small silver spots diffused throughout the unfigured side of the mirror to accomplish fast conductive cooling. Optical access to the cold mirror is by means of a small glass port in the vacuum chamber. An interferometer is used to examine the mirror figure throughout the cool-down. Interferograms are photographed, fringe patterns are digitized, and mirror figure contour plots are calculated by means of a computer.
    Keywords: ASTRONOMY
    Type: International Conference on Advanced Technology Optical Telescopes; Mar 11, 1982 - Mar 13, 1982; Tucson, AZ
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  • 3
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    Remote sensing data applied to the evaluation of soil erosion caused by land-use. Ribeirao Anhumas Basin Area: A case study (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Formerly covered by a tropical forest, the study area was deforested in the early 40's for coffee plantation and cattle raising, which caused intense gully erosion problems. To develop a method to analyze the relationship between land use and soil erosion, visual interpretations of aerial photographs (scale 1:25.000), MSS-LANDSAT imagery (scale 1:250,000), as well as automatic interpretation of computer compatible tapes by IMAGE-100 system were carried out. From visual interpretation the following data were obtained: land use and cover tapes, slope classes, ravine frequency, and a texture sketch map. During field work, soil samples were collected for texture and X-ray analysis. The texture sketch map indicate that the areas with higher slope angles have a higher susceptibilty to the development of gullies. Also, the over carriage of pastureland, together with very friable lithologies (mainly sandstone) occuring in that area, seem to be the main factors influencing the catastrophic extension of ravines in the study site.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10121 , NASA-CR-164375 , INPE-1965-RPE/276 , Intern. Symp. on Erosion and Sediment Transport Meas.; Jun 22, 1981 - Jun 25, 1981; Firenzi; Italy
    Format: application/pdf
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  • 4
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    Automatic interpretation of MSS-LANDSAT data applied to coal refuse site studies in southern Santa Catarina State, Brazil (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The coal mining district in southeastern Santa Catarina State is considered one of the most polluted areas of Brazil. The author has identified significant preliminary results on the application of MSS-LANDSAT digital data to monitor the coal refuse areas and its environmental consequences in this region.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10066 , NASA-CR-169577 , NAS 1.26:169577 , INPE-2410-PRE/119 , Intern. Symp. on Remote Sensing of Environ.; Jun 02, 1982 - Jun 09, 1982; Buenos Aires
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  • 5
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    Evaluation of SIR-A (Shuttle Imaging Radar) images from the Tres Marias region (Minas Gerais State, Brazil) using derived spatial features and registration with MSS-LANDSAT images (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two image processing experiments are described using a MSS-LANDSAT scene from the Tres Marias region and a shuttle Imaging Radar SIR-A image digitized by a vidicon scanner. In the first experiment the study area is analyzed using the original and preprocessed SIR-A image data. The following thematic classes are obtained: (1) water, (2) dense savanna vegetation, (3) sparse savanna vegetation, (4) reforestation areas and (5) bare soil areas. In the second experiment, the SIR-A image was registered together with MSS-LANDSAT bands five, six, and seven. The same five classes mentioned above are obtained. These results are compared with those obtained using solely MSS-LANDSAT data. The spatial information as well as coregistered SIR-A and MSS-LANDSAT data can increase the separability between classes, as compared to the use of raw SIR-A data solely.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10148 , NASA-CR-173238 , NAS 1.26:173238 , INPE-3113-PRE/510 , Intern. Soc. for Photogrammetry and Remote Sensing Congr.; Jun 18, 1984 - Jun 29, 1984; Rio de Janeiro; Brazil
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  • 6
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    Low background IR detector and detector array evaluations (1983)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: A technology program has been underway at Ames since 1978 to develop and evaluate detectors and integrated detector arrays for low-background astronomical applications. The approach is to evaluate existing (less than 24 micron) array technology under low-background conditions, with the aim of adapting and optimizing existing devices. For longer wavelengths, where the technology is much less mature, development is sponsored and devices are evaluated, in both discrete and array formats, for eventual applications. The status of this program has been reported previously. We rely on industrial and university sources for the detectors. Typically, after a brief functionality check in the supplier's laboratory, we work with the device at Ames to characterize its low-background performance. In the case of promising arrays or detectors, we conduct ground-based telescope testing to face the problems associated with real applications. A list of devices tested at Ames is given. In the array category, accumulation-mode charge-injection-devices (AMCIDs) appear repeatedly; this reflects our recent experience with the 2 x 64 and 16 x 16 arrays. Results from the 1 x 16 CID and InSb CCD have been reported. The status of our tests of the discrete Ge:x detectors from Lawrence Berkeley Laboratory are described below. Tests of a 1 x 2 switched sample photoconductor array are just beginning. A 32-channel CMOS multiplexer has been tested at 10 K. Low-temperature silicon MOSFETs and germanium JFETs have also been tested, primarily at Ball Aerospace. This paper describes results to date on three elements of this program: AMCID array, discrete Ge:Ga detectors, and Ge JFET preamplifiers.
    Keywords: OPTICS
    Type: Infrared Detector Technology Workshop; 33 p
    Format: text
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  • 7
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    Radially propagating shock waves in the outer heliosphere - The evidence from Pioneer 10 energetic particle and plasma observations (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: At heliocentric distances between 14 and 22 AU, some 14 increases in the flux of 1 MeV protons have been identified over a 3 yr period by the NASA Goddard/University of New Hampshire cosmic-ray experiment on Pioneer 10. These increases appear to be associated with large solar flares. Combining the particle data with the Pioneer 10 plasma observations from the NASA/Ames plasma analyzer reveals that the particle increases are produced by radially propagating shock waves generated by the solar events. While the characteristics of these particle events in the distant heliosphere appear to differ greatly from those observed at 1 AU, they represent the evolution expected as the interplanetary magnetic field becomes almost azimuthal. These long-lived shocks provide a valuable in situ laboratory for directly studying particle acceleration under a variety of conditions. They may also represent a significant factor in producing the long-term modulation of galactic cosmic rays.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 246
    Format: text
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  • 8
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    Integrated detector array technology for infrared astronomy (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The status of laboratory and telescope tests of integrated infrared detector array technology for astronomical applications is described. The devices tested represent a number of extrinsic and intrinsic detector materials and various multiplexer designs. Infrared arrays have now been used in successful astronomical applications. These have shown that device sensitivities can be comparable to those of discrete detector systems and excellent astronomical imagery can be produced.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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  • 9
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    An unusual SAR arc observed during ring current development, 4 August 1972 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An unusual SAR arc observed during the growth phase of the ring current is described. Proton precipitation was observed, with electron temperature enhancements throughout the region, and an F-region trough present at the equatorward boundary; a high flux of low energy at the SAR arc location and a 'slot' in the ambient electron density are characteristic of this event. Comparisons are made with S3-A spacecraft observations made in the equatorial region at the same time and with Isis-II observations of a more normal SAR arc; the kinetic Alfven process described by Hasegawa and Mima (1978) appears to account for the acceleration of these low energy electrons, although an auroral-type acceleration process cannot be excluded.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 28; Jan. 198
    Format: text
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  • 10
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    Solar flare X-ray spectra from the Solar Maximum Mission Flat Crystal Spectrometer (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High-resolution solar X-ray spectra obtained with the Flat Crystal Spectrometer aboard the Solar Maximum Mission from two solar flares and a nonflaring active region are analyzed. The 1-22 A region was observed during the flare on 1980 August 25, while smaller spectral regions were repeatedly covered during the 1980 November 5 flare. Voigt profiles were fitted to spectral lines to derive accurate wavelengths and to resolve blends. During the August 25 flare, 205 lines were found in the range 5.68-18.97 A, identifications being provided for all but 40 (mostly weak) lines. Upper limits to flare densities are derived from various line ratios, the hotter (about 10 to the 7th K) ions giving an electron density of less than 10 to the 12th per cu cm for the August 25 flare. Other observed line ratios (e.g., in Fe XVII and Mg XII) indicate a need for revisions in theoretical calculations.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 256
    Format: text
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