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  • Other Sources  (5)
  • 1
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    Signal processing techniques using Walsh functions (1970)
    In:  1970 Proc. Applications of Walsh Functions, Washington, European Association of Exploration Geophysicists, vol. 10, no. 28, pp. 309-314
    Details
    Publication Date: 1970
    Keywords: Detectors ; Transformations ; squ
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Program for the analysis of time series (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A digital computer program for the Fourier analysis of discrete time data is described. The program was designed to handle multiple channels of digitized data on general purpose computer systems. It is written, primarily, in a version of FORTRAN 2 currently in use on CDC 6000 series computers. Some small portions are written in CDC COMPASS, an assembler level code. However, functional descriptions of these portions are provided so that the program may be adapted for use on any facility possessing a FORTRAN compiler and random-access capability. Properly formatted digital data are windowed and analyzed by means of a fast Fourier transform algorithm to generate the following functions: (1) auto and/or cross power spectra, (2) autocorrelations and/or cross correlations, (3) Fourier coefficients, (4) coherence functions, (5) transfer functions, and (6) histograms.
    Keywords: MATHEMATICS
    Type: NASA-TM-X-2988 , L-9278
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    ANOPP programmer's reference manual for the executive System (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Documentation for the Aircraft Noise Prediction Program as of release level 01/00/00 is presented in a manual designed for programmers having a need for understanding the internal design and logical concepts of the executive system software. Emphasis is placed on providing sufficient information to modify the system for enhancements or error correction. The ANOPP executive system includes software related to operating system interface, executive control, and data base management for the Aircraft Noise Prediction Program. It is written in Fortran IV for use on CDC Cyber series of computers.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-X-74029
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of advanced aircraft noise reduction technology on the 1990 projected noise environment around Patrick Henry Airport (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study has been conducted of the future noise environment of Patric Henry Airport and its neighboring communities projected for the year 1990. An assessment was made of the impact of advanced noise reduction technologies which are currently being considered. These advanced technologies include a two-segment landing approach procedure and aircraft hardware modifications or retrofits which would add sound absorbent material in the nacelles of the engines or which would replace the present two- and three-stage fans with a single-stage fan of larger diameter. Noise Exposure Forecast (NEF) contours were computed for the baseline (nonretrofitted) aircraft for the projected traffic volume and fleet mix for the year 1990. These NEF contours are presented along with contours for a variety of retrofit options. Comparisons of the baseline with the noise reduction options are given in terms of total land area exposed to 30 and 40 NEF levels. Results are also presented of the effects on noise exposure area of the total number of daily operations.
    Keywords: AIRCRAFT
    Type: NASA-TM-X-71953
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A finite element method for nonaxisymmetric vibrations of pressurized shells of revolution partially filled with liquid. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 73-399 , Structures, Structural Dynamics, and Materials Conference; Mar 20, 1973 - Mar 22, 1973; Williamsburg, VA; US
    Format: text
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    NASA TECHNICAL REPORTS
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