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  • PROPULSION SYSTEMS  (118)
  • COMMUNICATIONS  (112)
  • ASTROPHYSICS
  • 1970-1974  (230)
  • 1972  (113)
  • 1971  (117)
Collection
Keywords
Years
  • 1970-1974  (230)
Year
  • 1
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    V/STOL propulsion (1971)
    In:  CASI
    Details
    Publication Date: 2006-04-20
    Description: Propulsion technology for STOL and V/STOL commercial aircraft
    Keywords: PROPULSION SYSTEMS
    Type: AIRCRAFT PROPULSION 1971; P 135-168
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Compression and error correction for TV (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Data compression and error correcting codes applied to digital transmission of real time, standard format TV, along with voice and other data from Apollo spacecraft
    Keywords: COMMUNICATIONS
    Type: NASA. Manned Spacecraft Center Proc. of the Space Shuttle Integrated Electron. Conf., Vol. 2; p 311-328
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Design study for a high reliability five-year spacecraft tape transport (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Following the establishment of the overall transport concept, a study of all of the life limiting constraints associated with the transport were analyzed using modeling techniques. These design techniques included: (1) a response analysis from which the performance of the transport could be determined under operating conditions for a variety of conceptual variations both in a new and aged condition; (2) an analysis of a double cone guidance technique which yielded an optimum design for maximum guidance with minimum tape degradation; (3) an analysis of the tape pack design to eliminate spoking caused by negative tangential stress within the pack; (4) an evaluation of the stress levels experienced by the magnetic tape throughout the system; (5) a general review of the bearing and lubrication technology as applied to satellite recorders and hence the recommendation for using standard load carrying antifriction ball bearings; and (6) a kinetic analysis to determine the change in kinetic properties of the transport during operation.
    Keywords: COMMUNICATIONS
    Type: NASA-CR-122453
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Upper-stage space shuttle propulsion by means of separate scramjet and rocket engines (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary mission study of a reusable vehicle from staging to orbit indicates payload advantages for a dual-propulsion system consisting of separate scramjet and rocket engines. In the analysis the scramjet operated continuously and the initiation of rocket operation was varied. For a stage weight of 500,000 lb the payload was 10.4 percent of stage weight or 70 percent greater than that of a comparable all-rocket-powered stage. When compared with a reusable two-state rocket vehicle having 50,000 lb payload, the use of the dual propulsion system for the second stage resulted in significant decreases in lift-off weight and empty weight, indicating possible lower hardware costs.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-6762 , E-6555
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A variable-step-size robust delta modulator. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Description of an analytically obtained optimum adaptive delta modulator-demodulator configuration. The device utilizes two past samples to obtain a step size which minimizes the mean square error for a Markov-Gaussian source. The optimum system is compared, using computer simulations, with a linear delta modulator and an enhanced Abate delta modulator. In addition, the performance is compared to the rate distortion bound for a Markov source. It is shown that the optimum delta modulator is neither quantization nor slope-overload limited. The highly nonlinear equations obtained for the optimum transmitter and receiver are approximated by piecewise-linear equations in order to obtain system equations which can be transformed into hardware. The derivation of the experimental system is presented.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communication Technology; COM-19; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Jet-noise reduction through liquid-base foam injection. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An experimental investigation has been made of the sound-absorbing properties of liquid-base foams and of their ability to reduce jet noise. Protein, detergent, and polymer foaming agents were used in water solutions. A method of foam generation was developed to permit systematic variation of the foam density. The investigation included measurements of sound-absorption coefficents for both plane normal incidence waves and diffuse sound fields. The intrinsic acoustic properties of foam, e.g., the characteristic impedance and the propagation constant, were also determined. The sound emitted by a 1-in.-diam cold nitrogen jet was measured for subsonic (300 m/sec) and supersonic (422 m/sec) jets, with and without foam injection. Noise reductions up to 10 PNdB were measured.
    Keywords: PROPULSION SYSTEMS
    Type: Acoustical Society of America; vol. 50
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of oscillator instability on telemetry signals (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Short term oscillator instability and phase jitter of telemetry signals using Pioneer 6 thru Pioneer 9 telemetry system as examples
    Keywords: COMMUNICATIONS
    Type: NASA-TN-D-6442 , A-3836
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Collapsible antenna boom and transmission line Patent (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Collapsible antenna boom and coaxial transmission line having inflatable inner tube
    Keywords: COMMUNICATIONS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    A study of the use of liquid base foams for jet noise reduction (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Acoustical properties of liquid base foams and application for jet noise reduction
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-1695
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Auxiliary power unit design studies. Space shuttle APU system selection and performance (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Space shuttle auxiliary power unit design selection and performance evaluation
    Keywords: PROPULSION SYSTEMS
    Type: NASA. MARSHALL SPACE FLIGHT CENTER PROC.- SPACE TRANSPORTATION SYSTEM PROPULSION TECHNOL. CONF., VOL. 3 28 APR. 1971; P 1099-1122
    Format: text
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    NASA TECHNICAL REPORTS
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