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  • Other Sources  (715)
  • NASA Technical Reports  (715)
  • ASTRONOMY  (372)
  • FLUID MECHANICS AND HEAT TRANSFER  (343)
  • 1980-1984  (715)
  • 1984  (715)
  • 1
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    Experimental investigation of turbulent flow in smooth and longitudinal grooved tubes (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Turbulent flow in tubes with and without longitudinal grooves is examined. The discovery of fine grooves forming a sort of streamline pattern on the body of sharks led to the expectation that the grooves on a surface reduce the momentum change, and thus the drag. To test this thesis, drag law, velocity profile and the profile of the velocity fluctuation were determined. Results show that for moderate Reynolds numbers the drag coefficient for grooved tubes is about 3 percent smaller than that of the smooth tubes. At higher Reynolds numbers, however, the drag coefficient for grooved tubes becomes larger than that for smooth tubes. No significant differences in the velocity profiles between grooved tubes and smooth tubes are found.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77480 , NAS 1.15:77480
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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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
  • 3
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    Turbulent boundary layers with secondary flow (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An experimental analysis of the boundary layer on a plane wall, along which the flow occurs, whose potential flow lines are curved in plane parallel to the wall is discussed. According to the equation frequently applied to boundary layers in a plane flow, which is usually obtained by using the pulse law, a generalization is derived which is valid for boundary layers with spatial flow. The wall shear stresses were calculated with this equation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77494 , NAS 1.15:77494
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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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    NASA TECHNICAL REPORTS
  • 5
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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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  • 6
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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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  • 7
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    Contribution to the Performance Determination of Microjets (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Theoretical investigations are made on the performance of microjets. A description is given of experiments with micropropulsion units to correlate the results obtained in the first part of the report. Execution of performance measurements is discussed, and error calculations are presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77730 , NAS 1.15:77730
    Format: application/pdf
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  • 8
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    Visualization of the 3-dimensional flow around a model with the aid of a laser knife (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A method for visualizing the three-dimensional flow around models of various shapes in a wind tunnel at a Mach number of 5 is described. A laser provides a planar light flux such that any plane through the model can be selectively illuminated. The shape of shock waves and separation regions is then determined by the intensity of light scattered by soot particles in the flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77497 , NAS 1.15:77497
    Format: application/pdf
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  • 9
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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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    NASA TECHNICAL REPORTS
  • 10
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    Second All-Union Seminar on Hydromechanics and Heat-Mass Transfer in Weightlessness. Abstracts of reports: Table of contents (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Abstracts of reports are given which were presented at the Second All Union Seminar on Hydromechanics and Heat-Mass Transfer in Weightlessness. Topics inlcude: (1) features of crystallization of semiconductor materials under conditions of microacceleration; (2) experimental results of crystallization of solid solutions of CDTE-HGTE under conditions of weightlessness; (3) impurities in crystals cultivated under conditions of weightlessness; and (4) a numerical investigation of the distribution of impurities during guided crystallization of a melt.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-77534 , NAS 1.15:77534 , Jan 01, 1981; Perm; USSR
    Format: application/pdf
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