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  • ASTROPHYSICS  (193)
  • INSTRUMENTATION AND PHOTOGRAPHY  (92)
  • 550 - Earth sciences
  • AIRCRAFT DESIGN, TESTING AND PERFORMANCE
  • Lunar and Planetary Science and Exploration
  • MATERIALS, METALLIC
  • SPACE SCIENCES
  • 2010-2014
  • 1975-1979  (353)
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  • 1979  (149)
  • 1976  (204)
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  • 2010-2014
  • 1975-1979  (353)
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  • 1
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    Stellar model chromospheres. XI - A survey of Ca II lambda 8542 line profiles in late-type stars of differing chromospheric activity (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): ASTROPHYSICS
    Materialart: PB80-144215 , Astrophysical Journal Supplement Series; 41; Nov. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Laboratory calibration of AAFE radiometer/scatterometer (RADSCAT) (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: A brief description of the electrical and mechanical instrument configuration, followed by an extensive discussion of laboratory tests and results are contained herein. This information is required to provide parameters for data reduction, and a basis for analysis of the measurement errors in data taken with this instrument.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA-TM-X-73900
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Structural dynamics, stability, and control of helicopters (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The dynamic synthesis of a helicopter is reported. The method of approach is a variation of the component mode synthesis in the sense that it regards the aircraft as an assemblage of interconnected substructures. The equations of motion are derived in general form by means of the Lagrangian formulation in conjunction with an orderly kinematical procedure that takes into account the superposition of motion of various substructures, thus circumventing constraint problems.
    Schlagwort(e): AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: NASA-CR-148286 , SAPR-3
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Can Malin's gravitational-field equations be modified to obtain a viable theory of gravity (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Malin's (1975) gravitational theory, which was recently shown by Lindblom and Nester (1975) to be incorrect, is modified by means of a recently proposed method for obtaining viable gravitational theories. The resulting self-consistent theory, which is in effect a Rastall-type modification of the Einstein theory, exhibits nonconservation of momentum, yet agrees with all experimental limits known to date within the post-Newtonian approximation framework.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Nuovo Cimento; vol. 35B
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Scalar-tensor theory of gravitation with negative coupling constant (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The possibility of a Brans-Dicke scalar-tensor gravitation theory with a negative coupling constant is considered. The admissibility of a negative-coupling theory is investigated, and a simplified cosmological solution is obtained which allows a negative derivative of the gravitation constant. It is concluded that a Brans-Dicke theory with a negative coupling constant can be a viable alternative to general relativity and that a large negative value for the coupling constant seems to bring the original scalar-tensor theory into close agreement with perihelion-precession results in view of recent observations of small solar oblateness.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Nuovo Cimento; vol. 35
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Conceptual design of reduced energy transports (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The paper reports the results of a conceptual design study of new near-term fuel-conservative aircraft. A parametric study was made to determine the effects of cruise Mach number and fuel cost on the optimum configuration characteristics and relative economic performance. Supercritical wing technology and advanced engine cycles were assumed. For each design, the wing geometry was selected to maximize an economic figure of merit which reflects the potential rate of return on investment. Based on the results of the parametric study, a reduced energy configuration was selected. Compared with existing transport design, the reduced energy design has a higher aspect ratio wing with lower sweep, and cruises at a slightly lower Mach number. It yields about 30% more seat-miles/gal than current wide-body aircraft. At the higher fuel costs anticipated in the future, the reduced energy design has about the same economic performance as existing designs with the same technology level. As an example of a far-term technology application, a design with a composite material wing was also investigated.
    Schlagwort(e): AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Journal of Aircraft; 13; Aug. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Balloon-borne ultraviolet stellar spectrograph. I - Instrumentation and observation. II - Highlights of first observational results (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: A dual star-tracking system and a system including a telescope, an echelle spectrograph, and a SEC vidicon are the chief components of the Balloon-borne Ultraviolet Stellar Spectrograph (BUSS), which has flown four successful missions. The BUSS missions have yielded 81 spectra for 56 stars, recorded with a resolution of 0.1 A in the wavelength range from 2200 to 3400 A. BUSS observations include: profiles of Mg II lines indicating considerable mass flow in early-type supergiants; Mg II features suggesting a cool expanding outer shell above a hotter chromosphere; emission features in Zeta Tau (a shell star) indicating infalling material; and emission features of the Be star Phi Per suggesting mass outflow.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal; vol. 230
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Remote sensing using solid-state array technology (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The paper describes the design features and capabilities of a remote sensor that uses solid-state linear arrays and operates in a 'pushbroom' scan mode to provide the required performance. Pushbroom scanning is a term describing the technique of using the forward motion of a satellite platform to sweep a linear array of detectors oriented perpendicular to the ground track across a scene being imaged. One array is typically used for each spectral channel. Satellite motion provides one direction of scan and electronic sampling of the detectors in the crosstrack dimension provides the orthogonal scan component to form an image. The detector array is sampled at the appropriate rate so that contiguous lines are produced. The performance of a pushbroom system is discussed relative to radiometric sensitivity, detector array geometric fidelity, and radiometric correction. System advantages are precision geometric positioning of the detectors, very high sensitivity and favorable SNR, low power consumption, and no moving optics.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    High angle of incidence implications upon air intake design and location for supersonic cruise aircraft and highly maneuverable transonic aircraft (1979)
    In:  CASI
    Details
    Publikationsdatum: 2017-10-02
    Beschreibung: The effects of angle of attack on supersonic mixed compression inlet performance at four different locations about a hypothetical forebody are given. A computational method to predict optimum inlet location, orientation, and centerbody control schedule for design and off-design performance is described. The effects of inlet location and a forward canard on the angle-of-attack performance of a normal shock inlet at transonic speeds were studied. Proper integration of inlet location and a forward canard can enhance the angle-of-attack performance of a normal shock inlet. Two lower lip treatments for improving the angle-of-attack performance of rectangular inlets at transonic speeds are discussed.
    Schlagwort(e): AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: AGARD High Angle of Attack Aerodyn.; 10 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Structural design studies of a supersonic cruise arrow wing configuration (1976)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Structural member cross sections were sized with a system of integrated computer programs to satisfy strength and flutter design requirements for several variants of the arrow wing supersonic cruise vehicle. The resulting structural weights provide a measure of the structural efficiency of the planform geometry, structural layout, type of construction, and type of material including composites. The material distribution was determined for a baseline metallic structure and the results indicate that an approximate fatigue constraint has an important effect on the structural weight required for strength but, in all cases, additional material had to be added to satisfy flutter requirements with lighter mass engines with minimum fuel onboard. The use of composite materials on the baseline configuration was explored and indicated increased structural efficiency. In the strength sizing, the all-composite construction provided a lower weight design than the hybrid construction which contained composites only in the wing cover skins. Subsequent flutter analyses indicated a corresponding lower flutter speed.
    Schlagwort(e): AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Materialart: Proc. of the SCAR Conf., Pt. 2,; 25 p
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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