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  • Other Sources  (686)
  • NASA Technical Reports  (686)
  • ASTRONOMY  (372)
  • STRUCTURAL MECHANICS  (314)
  • 1980-1984  (686)
  • 1984  (686)
  • 1
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    Determination of the observation conditions of celestial bodies with the aid of the DISPO system (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The interactive system for determining the observation conditions of celestial bodies is described. A system of programs was created containing a part of the DISPO Display Interative System of Orbit Planning. The system was used for calculating the observatiion characteristics of Halley's comet during its approach to Earth in 1985-86.
    Keywords: ASTRONOMY
    Type: NAS 1.15:77632 , NASA-TM-77632
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Measurement of high temperature strain by the laser-speckle strain gauge (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: By using the laser-speckle strain gauge, the strain of metal at the temperature lower than 250 C is measured. The principle of the gauge is to measure the expansion or contraction of the fine structures of surface by detecting the resultant speckle displacement in an optoelectronic way, whereby the effect of rigid-body motion is automatically cancelled out with the aid of a differential detection system. A transportable apparatus was built and a comparison experiment performed with a resistance strain gauge at room temperature. It has a strain sensitivity of .00002, a gauge length smaller than 1 mm, and no upper limit in a range of strain measurement. In the measurement of high-temperature strain it is free from the need for a dummy gauge and insensitive to an electric drift effect. As examples of strain measurement at high-temperature, thermal expansion and contraction of a top of a soldering iron are measured. The interval of the measurement can be made at shortest 1.6 sec. and the change in the strain is clearly followed until the ultimate stationary temperature is reached.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77751 , NAS 1.15:77751
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Back stress in dislocation creep. Part 1: Basic concepts and measuring techniques (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A theory is proposed whereby the plastic deformation of metal materials is determined by the difference between the applied stress and the back stress which characterizes the resistance of the material to plastic deformation. The back stress is usually equivalent to the internal stress or the friction stress and depends on the magnitude of the applied stress and temperature. The concept of back stress is applied to the case of the dislocation creep of precipitation-hardened or dispersion-strengthened metal materials. An additivity rule is formulated which can be useful in interpreting the creep behavior of such materials.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77773 , NAS 1.15:77773
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Shock testing of a nitrogen tank (Cryo diffusion type 220 VLR) on the middle weight shock stand (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Results of vertical and horizontal shock tests on type 200 VLR nitrogen tank are given.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77747 , NAS 1.15:77747
    Format: application/pdf
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  • 5
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    IRAS observations of the diffuse infrared background (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: IRAS data reveal bright emission from interplanetary dust which dominates the celestial background at 12, 25, and 60 microns except near the galactic plane. At 100 microns, interplanetary dust emission is prominent only near the ecliptic plane; diffuse galactic emission is found over the rest of the sky. At the galactic poles, the observed brightness implies that A(v) is likely to be of order 0.1 mag. The angular variation of the zodiacal emission in the ecliptic plane and in the plane at elongation 90 deg, and an annual modulation of the ecliptic pole brightness, are generally consistent with previously determined interplanetary dust distributions.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L15-L18
    Format: text
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  • 6
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    The IRAS minisurvey (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Before the main Infrared Astronomical Satellite (IRAS) all-sky survey was started, a preliminary survey of 900 sq deg was carried out. Some results from this 'minisurvey' are given here. The completeness of the minisurvey at galactic latitudes from 20 to 40 deg drops sharply at flux densities below 0.4, 0.4, 0.5, and 2.5 Jy at 12, 25, 60, and 100 microns, respectively. The corresponding surface densities of point sources brighter than these flux levels are 1.1, 0.4, 0.65, and 1.25/sq deg, respectively. Outside the galactic plane, the majority of the sources at 12 and 25 microns are stars, while galaxies make up a significant proportion of 60 micron sources. The 100 micron band is dominated by emission from interstellar dust over much of the minisurvey area.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L7-L10
    Format: text
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  • 7
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    IRAS images of the galactic center (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Some preliminary IRAS results in the form of images at 12, 25, 60, and 100 microns of an 8 deg x 15 deg area around the galactic center are presented. These absolute intensity maps have unprecedented sensitivity combined with high angular resolution, wide field coverage, and large wavelength range. They give a broad view of the central galaxy revealing previously unseen details, especially in regions far from the central few arcmin. Well-defined infrared features in the nucleus correspond to the nuclear radio sources Sgr A, B2, C, and D. Extremely faint structures are detected, such as the cold molecular cloud associated with Sgr B2 which has never before been detected at wavelenths shorter than 40 microns.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L57
    Format: text
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  • 8
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    Abundances in galactic H2 regions, 3: G25.4-0.2, G45.5+0.06, M8, S159 and DR22 (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Measurements of the ARII (6.99 microns), ArIII (8.99 microns), NeII (12.81 microns), SIII (18.71 microns), and SIV (10.51 microns) lines are presented for five compact HII regions along with continuum spectroscopy. From these data and radio data, lower limits to the elemental abundances of Ar, S, and Ne were deduced. The complex G25.4-0.2 is only 5.5 kpc from the galactic center, and is considerably overabundant in all these elements. Complex G45.5+0.06 is at seven kpc from the galactic center, and appears to be approximately consistent with solar abundance. The complex S159 in the Perseus Arm, at 12 kpc from the galactic center, has solar abundance, while M8 in the solar neighborhood may be somewhat overabundant in Ar and Ne. Complex DR 22, at 10 kpc from the galactic center in the Cygnus Arm, is overabundant in Ar. A summary of results from a series of papers on abundances is given.
    Keywords: ASTRONOMY
    Type: NASA-TM-85962 , A-9756 , NAS 1.15:85962 , PREPRINT-017
    Format: application/pdf
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  • 9
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    Bending strength studies on hot-pressed silicon carbide (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The 4-point bending strength of 4 grades of hot-pressed SiC was determined at different temperatures. With a transgranular mode of fracture the values for bending strength are retained up to high temperatures. For intergranular fracture the decrease of strength is governed by subcritical crack growth. The intergranular fracture is caused by a high content of silicate glassy phase at the grain boundaries of hot-pressed SiC.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77512 , NAS 1.15:77512
    Format: application/pdf
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  • 10
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    The catalogue of the discrete sources in the declination range from -13 deg to -2 deg (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The results of the discrete source measurements with declinations -13 deg or = delta or = -2 deg and right ascensions 0 sub h + 24 sub h are given and were obtained as part of the systematic decametric survey of the celestial sphere with the rotatiotelecope UTR-2. Three hundred sixteen sources were found in the given declination range, four of which were observed for the first time. The source coordinates measured in the survey were compared with those from the 4th Cambridge survey at 178 MHz and the Parkes survey at 408 MHz.
    Keywords: ASTRONOMY
    Type: NASA-TM-77594 , NAS 1.15:77594 , PR-147
    Format: application/pdf
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