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  • Other Sources  (702)
  • ASTROPHYSICS  (432)
  • AIRCRAFT PROPULSION AND POWER  (270)
  • 1975-1979  (702)
  • 1977  (702)
  • 1
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    The Soviet-American Conference on Cosmochemistry of the Moon and Planets, Part 2 (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The origin and evolution of the solar system is discussed based on ground and satellite observations.
    Keywords: ASTROPHYSICS
    Type: NASA-SP-370-PT-2 , LC-75-600013 , Soviet-American Conference on Cosmochemistry of the Moon and Planets; Jun 04, 1974 - Jun 08, 1974; Moscow; Russia
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    New materials for high temperature turbines; ONERA's DS composites confronted with blade problems (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: ONERA's refractory DS composites were cited as materials required for use in advanced aircraft turbines, operating at high temperatures. These materials were found to be reliable in the construction of turbine blades. Requirements for a blade material in aircraft turbines operating at higher temperatures were compared with the actual performance as found in COTAC DS composite testing. The structure and properties of the more fully developed 74 and 741 types were specified. High temperature structural stability, impact of thermal and mechanical fatigue, oxidation resistance and coating capability were thoroughly evaluated. The problem of cooling passages in DS eutectic blades is also outlined.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-75216 , High Temp. Probl. in Gas Turbine Eng.; 19-23 Sept. 1977; Ankara
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    High temperature corrosion-resistant protective coatings in stationary gas turbines (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Methods currently used to deposit protective coatings in gas turbines are reviewed, and the structure of the respective coatings is examined. The corrosion behavior of such coatings is discussed on the basis of experimental data. General trends in the preparation of protective coatings are noted.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-75181 , Tagung in Verbundwerkstoffe; Mar 28, 1974 - Mar 29, 1974; Constance; Germany
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    NASA TECHNICAL REPORTS
  • 4
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    X-ray bursts - The maximum mass of a neutron star (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A review of the great variety of observed properties of X-ray burst sources is presented, including the MXB 1730-355, called the rapid burster. Hypotheses regarding the sources of bursts are discussed, and two models for the rapid burster are described. The first postulates that they are caused by a collapsed object with a mass of approximately 10 solar masses surrounded by a disk of gas spiralling inward. The second posits a neutron star with a strong magnetic field. Theoretical questions regarding the mass of neutron stars are discussed, and prerequisites for such research are identified. Various research projects investigating these questions are described.
    Keywords: ASTROPHYSICS
    Type: Mercury; 6; July-Aug
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Contraction of the Orion Nebula cluster-molecular cloud A complex (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Observational evidence is presented in support of the view that the width of the molecular lines in Orion is produced by a contraction of the cloud with a velocity directly proportional to the distance from the cloud center. The main support is provided by close agreement between the motions of the cloud and that of the stars embedded in it. A further implication of this agreement is that star formation occurred throughout the Orion cloud, rather than only in the dense center as predicted by the conventional picture of star formation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 217
    Format: text
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  • 6
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    Evolution of the moon: The 1974 model (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The interpretive evolution of the moon can be divided now into seven major stages beginning sometime near the end of the formation of the solar system. These stages and their approximate durations in time are as follows: (1) The Beginning: 4.6 billion years ago, (2) The Melted Shell: 4.6 to 4.4 billion years ago, (3) The Cratered Highlands: 4.4 to 4.1 billion years ago, (4) The Large Basins: 4.1 to 3.9 billion years ago, (5) The Light-colored Plains: 3.9 to 3.8 billion years ago, (6) The Basaltic Maria: 3.8 to 3.0(?) billion years ago, and (7) The Quiet Crust: 3.0(?) billion years ago to the present. The contributions of the Apollo and Luna exploration toward the study of those stages of evolution are reviewed.
    Keywords: ASTROPHYSICS
    Type: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, pt. 1; p 63-80
    Format: application/pdf
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  • 7
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    Aerodynamic investigation of an air-cooled axial-flow turbine. Part 2: Rotor blade tip-clearance effects on overall turbine performance and internal gas flow conditions: Experimental results and prediction methods (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Total turbine blade performance was investigated while changing the blade tip clearance in three ways. The internal flow at the moving blade outlet point was measured. Experimental results were compared with various theoretical methods. Increased blade clearance leads to decreased turbine efficiency.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-75138
    Format: application/pdf
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  • 8
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    On the emission of neutrinos and gravitational waves in the formation of neutron stars (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The various modes in which the energy generated by the formation of a neutron star or black hole due to collapse of a stellar core can appear are investigated, and physical constraints are placed on this energy distribution by noting that neutron stars appear to have been found in at least six X-ray binaries and one binary pulsar. The energy generated by a supernova during the collapse of a stellar core to a neutron star is considered along with the manner in which this energy is distributed in the different modes. It is shown that the gravitational binding energy of a neutron star is converted mostly into kinetic energy of rotation or is emitted as neutrinos, gravitational waves, or both. The energy release through mass ejection and cosmic rays is suggested to be no more than a few percent of the total energy involved. A possible scenario is outlined for the case where the initial rotation velocity of the collapsing core exceeds some critical limit. It is concluded that gravitational radiation will be the ultimate outlet for most of the binding energy in this case.
    Keywords: ASTROPHYSICS
    Type: Astrophysics and Space Science; 51; 1, Se; Sept
    Format: text
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  • 9
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    Eight-bladed propeller design could bring back turboprop airplanes (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: P77-10204 , NASA-NEWS-RELEASE-77-206
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    NASA TECHNICAL REPORTS
  • 10
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    Results of special mechanical analyses of Luna 16 material (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The studies carried out on the Luna 16 regolith have confirmed the data that were already published internationally. By means of activation analysis under irradiation in the reactor, activation analysis with a 14 MeV U-generator, and mass spectroscopy on samples of 10 or 20 mg, six main and 63 trace elements were quantitatively determined and compared with known data.
    Keywords: ASTROPHYSICS
    Type: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 697-702
    Format: application/pdf
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