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  • AIRCRAFT  (165)
  • STRUCTURAL MECHANICS  (159)
  • CHEMISTRY  (140)
  • ASTROPHYSICS
  • 1970-1974  (482)
  • 1960-1964  (23)
  • 1974  (171)
  • 1972  (165)
  • 1970  (146)
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  • 1970-1974  (482)
  • 1960-1964  (23)
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  • 11
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    Estimates of the Venus atmosphere optical characteristics with application to the problem of photographing its clouds and surface (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Optical parameters investigated and solved for included: (1) cloud layer albedo and cloud cover optical thickness; (2) planetary surface self-radiation influence; (3) light flux distribution as function of atmospheric height; (4) upper estimate of the observed contrasts; (5) surface optical parameters; and (6) contrast decrease with altitude.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Space Iconics (NASA-TT-F-798); p 121-135
    Format: text
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  • 12
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    Applicability of the diffusion approximation (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Several methods using an approximate form of the scattering indicatrix are discussed for simplifying the calculation of radiation transport in planetary atmospheres.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Space Iconics (NASA-TT-F-798); p 75-84
    Format: text
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  • 13
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    Purification, crystallization, and subunit structure of allosteric adenosine 5'-monophosphate nucleosidase. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Schlagwort(e): CHEMISTRY
    Materialart: Biochemistry; 11; 15, 1; 1972
    Format: text
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  • 14
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    Mixed mode stress field effect in adhesive fracture (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Numerical or analytical analyses were performed on seven different test specimens including blister test, 90-degree peel test, torsion test, and various cone tests. These specimens are in general subjected to complex stress fields having various amounts of Mode I, Mode II, and Mode III loads. The specimens were then constructed using polymethyl methacrylate for the adherends and a transparent polyurethane elastomer (Solithane 113) for the adhesive. This combination permitted direct observation of the bondline as load was applied. Although initial debonds as well as bond end termination singularities were present in all specimens, in some cases the debond did not initiate at the singularity points as would normally have been expected. An explanation for this behavior is presented, as well as a comparison of loading mode effect on those specimens for which the debond did propagate from a bond terminus singular point.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: International Journal of Fracture; 10; Dec. 197
    Format: text
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  • 15
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    EPR investigation of Ti2+ in SrCl2 single crystals. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The observation of 'double quantum' transitions which made it possible to determine the charge state of Ti as 2+ is reported. The EPR spectrum observed at 1.2 K is presented in a graph. The first derivative of the absorption is shown vs the magnetic field. The hyperfine patterns for the Ti-47 and Ti-49 isotopes are identified. Spin-Hamiltonian parameters for Ti(2+) in various cubic hosts are listed.
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Chemical Physics; 57; Oct. 15
    Format: text
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  • 16
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    Transonic single-mode flutter and buffet of a low aspect ratio wing having a subsonic airfoil shape (1974)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Transonic flutter and buffet results obtained from wind-tunnel tests of a low aspect ratio semispan wing model are presented. The tests were conducted to investigate potential transonic aeroelastic problems of vehicles having subsonic airfoil sections. The model employed NACA 00XX-64 airfoil sections in the streamwise direction and had a 14 deg leading edge sweep angle. Aspect ratio, and average thickness were 4.0, 0.35, and 8 percent, respectively. The model was tested at Mach numbers from 0.6 to 0.95 at angles of attack from 0 deg to 15 deg. Two zero lift flutter conditions were found that involved essentially single normal mode vibrations. With boundary layer trips on the model, flutter occurred in a narrow Mach number range centered at about Mach 0.90. The frequency and motion of this flutter were like that of the first normal mode vibration. With the trips removed flutter occurred at a slightly high Mach number but in a mode strongly resembling that of the second normal mode.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-TN-D-7346 , A-4966
    Format: application/pdf
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  • 17
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    Phase equilibria in fluid mixtures at high pressures: The He-CH4 system (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An experimental study of phase equilibria in the He-CH4 system was carried out over the temperature range 95 to 290 K and at pressures to 10,000 atm. The experimental results consist of equilibrium phase composition for twenty-eight isotherms in the region of coexistence of two fluid phases, together with the pressure-temperature trace of the three-phase boundary at which a CH4-rich solid phase is in equilibrium with the two fluid phases. The system exhibits a fluid-fluid phase separation which persists to temperatures and pressures beyond the range of this experiment. These results, together with those recently obtained for other binary systems, provide information about the form of phase diagrams for binary gas mixtures in the region of pressure induced phase transitions at high pressures. These findings are relevant to problems of deep atmosphere and interior structures in the outer planets.
    Schlagwort(e): CHEMISTRY
    Materialart: Univ. Space Res. Assoc. High Pressure Phys. and Planetary Interiors; p 69-77
    Format: text
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  • 18
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    Electrode reactions of aromatic amines in solvents containing fused AlCl3. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Journal of Electroanalytical Chemistry and Interfacial Electrochemistry; 38; 1972
    Format: text
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  • 19
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    Luna 20 and Apollo 16 core fines - Large-ion lithophile trace-element abundances. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): CHEMISTRY
    Materialart: Earth and Planetary Science Letters; 17; Dec. 197
    Format: text
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  • 20
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    Residual strength and crack propagation tests on C-130 airplane center wings with service-imposed fatigue damage (1972)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Fourteen C-130 airplane center wings, each containing service-imposed fatigue damage resulting from 4000 to 13,000 accumulated flight hours, were tested to determine their fatigue crack propagation and static residual strength characteristics. Eight wings were subjected to a two-step constant amplitude fatigue test prior to static testing. Cracks up to 30 inches long were generated in these tests. Residual static strengths of these wings ranged from 56 to 87 percent of limit load. The remaining six wings containing cracks up to 4 inches long were statically tested as received from field service. Residual static strengths of these wings ranged from 98 to 117 percent of limit load. Damage-tolerant structural design features such as fastener holes, stringers, doublers around door cutouts, and spanwise panel splices proved to be effective in retarding crack propagation.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-2075 , ER-11178
    Format: application/pdf
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