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  • STRUCTURAL MECHANICS  (64)
  • Physics  (55)
  • COMMUNICATIONS  (51)
  • ASTROPHYSICS
  • 1970-1974  (170)
  • 1971  (170)
Collection
Keywords
Publisher
Years
  • 1970-1974  (170)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxidative crosslinking in poly(ethylene terephthalate) at elevated temperaturesPresented at the Southeastern Regional Meeting of the American Chemical Society, Richmond, Virginia, November 5-8, 1969. (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 2063-2070 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(ethylene terephthalate) oxidizes on being heated in air at elevated temperatures to form a crosslinked structure. The crosslinking occurs through a reaction which causes arylation of terephthalate rings to form a biphenyltricarboxylic acid derivative. This reaction is interpreted as a free-radical cleavage generating a substituted phenyl radical which selectively attaches to a terephthalate residue via substitution.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090722
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Oligomeric silazanes (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 183-192 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High conversions of oligomeric silazanes that are not volatile at 200°C/0.1 mm are obtained when hexamethylcyclotrisilazane or octamethylcyclotetrasilazane is heated with a molar deficiency of dichlorodimethylsilane at 175°C. The oligomers, which show moderate solvolytic stability, contain disilazane, trisilylamine, and cyclodisilazane units. They are structurally similar to materials that have been prepared by others from hexamethylcyclotrisilazane and ammonium bromide. When the oligomers are treated with ammonia and heated to 325°C, evidence can be found in their spectra for the presence of oligocyclodisilazane structures.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090117
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    Paper (German National Licenses)
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  • 3
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    Thick high aspect ratio wing, part 2 (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Transonic flutter and buffeting for elastic wind tunnel models of straight wing proposed for space shuttles
    Keywords: STRUCTURAL MECHANICS
    Type: NASA SPACE SHUTTLE TECHNOL. CONF., VOL. 3 APR. 1971; P 201-229
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Response of an acoustically loaded panel excited by supersonically convected turbulence (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Structural panel under acoustic loading by supersonic convected turbulence, deriving responses with finite Fourier transforms
    Keywords: STRUCTURAL MECHANICS
    Type: ; - DISCRETE CONTROL S
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measurements of the response of a panel excited by shock boundary-layer interaction (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Plate excitation by supersonic turbulent and shock boundary layers, measuring wall pressure fluctuation and panel displacement
    Keywords: STRUCTURAL MECHANICS
    Type: ; - DISCRETE CONTROL S
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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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
  • 7
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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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  • 8
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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
  • 9
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    C-130: Results of center wing residual strength and crack propagation test program (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fourteen C-130 airplane center wings which had experienced from approximately 4,000 to 13,000 hours of flight service and its associated fatigue damage were tested to destruction, seven in upbending and seven in downbending. Six wings were tested directly for static residual strength in the fatigue-damaged condition as received from field service. The other eight wings were tested in crack propagation cyclic testing at a prescribed stress level for a maximum of 10,000 cycles. Then the stress level was reduced and testing was continued up to a maximum of 20,000 total cycles. Cyclic testing was performed with constant-amplitude stresses at a stress ratio of +0.1. Maximum cyclic skin stresses were approximately 18,000 psi. At the conclusion of cyclic testing, a static test to destruction was conducted to determine the residual strength of each fatigue-damaged specimen.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-112008 , ER-11178 , LSR-7221-70-012A
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Supersonic flutter of sandwich panels - Effects of face sheet bending stiffness, rotary inertia, and orthotropic core shear stiffnesses (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Numerical analysis of supersonic flutter of flat rectangular, biaxilly stressed sandwich panels
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-6427 , A-3868
    Format: application/pdf
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