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  • Other Sources  (6)
  • COMPUTER PROGRAMMING AND SOFTWARE  (4)
  • GEOPHYSICS  (2)
  • Chemical Engineering
  • 2005-2009
  • 1990-1994  (6)
  • 1970-1974
  • 1991  (6)
  • 1
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    Translating an AI application from Lisp to Ada: A case study (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A set of benchmarks was developed to test the performance of a newly designed computer executing both Lisp and Ada. Among these was AutoClassII -- a large Artificial Intelligence (AI) application written in Common Lisp. The extraction of a representative subset of this complex application was aided by a Lisp Code Analyzer (LCA). The LCA enabled rapid analysis of the code, putting it in a concise and functionally readable form. An equivalent benchmark was created in Ada through manual translation of the Lisp version. A comparison of the execution results of both programs across a variety of compiler-machine combinations indicate that line-by-line translation coupled with analysis of the initial code can produce relatively efficient and reusable target code.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-103845 , A-91094 , NAS 1.15:103845
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Spacecraft Orbit Design and Analysis (SODA). Version 2.0: User's guide (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Spacecraft Orbit Design and Analysis (SODA) computer program, Version 2.0, is discussed. SODA is a spaceflight mission planning system that consists of six program modules integrated around a common database and user interface. SODA runs on a VAX/VMS computer with an Evans and Sutherland PS300 graphics workstation. In the current version, three program modules produce an interactive three dimensional animation of one or more satellites in planetary orbit. Satellite visibility and sensor coverage capabilities are also provided. Circular and rectangular, off nadir, fixed and scanning sensors are supported. One module produces an interactive three dimensional animation of the solar system. Another module calculates cumulative satellite sensor coverage and revisit time for one or more satellites. Currently, Earth, Moon, and Mars systems are supported for all modules except the solar system module.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-187494 , NAS 1.26:187494 , TAO-60057
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Software for Optical Archive and Retrieval (SOAR) user's guide, version 4.2 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The optical disk is an emerging technology. Because it is not a magnetic medium, it offers a number of distinct advantages over the established form of storage, advantages that make it extremely attractive. They are as follows: (1) the ability to store much more data within the same space; (2) the random access characteristics of the Write Once Read Many optical disk; (3) a much longer life than that of traditional storage media; and (4) much greater data access rate. Software for Optical Archive and Retrieval (SOAR) user's guide is presented.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-105039 , NAS 1.15:105039 , NSSDC/WDC-A-R/S-91-06
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    User's manual for the Macintosh version of PASCO (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A user's manual for Macintosh PASCO is presented. Macintosh PASCO is an Apple Macintosh version of PASCO, an existing computer code for structural analysis and optimization of longitudinally stiffened composite panels. PASCO combines a rigorous buckling analysis program with a nonlinear mathematical optimization routine to minimize panel mass. Macintosh PASCO accepts the same input as mainframe versions of PASCO. As output, Macintosh PASCO produces a text file and mode shape plots in the form of Apple Macintosh PICT files. Only the user interface for Macintosh is discussed here.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-TM-104115 , NAS 1.15:104115
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Geodesy by radio interferometry - Water vapor radiometry for estimation of the wet delay (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An important source of error in VLBI estimates of baseline length is unmodeled variations of the refractivity of the neutral atmosphere along the propagation path of the radio signals. This paper presents and discusses the method of using data from a water vapor radiomete (WVR) to correct for the propagation delay caused by atmospheric water vapor, the major cause of these variations. Data from different WVRs are compared with estimated propagation delays obtained by Kalman filtering of the VLBI data themselves. The consequences of using either WVR data or Kalman filtering to correct for atmospheric propagation delay at the Onsala VLBI site are investigated by studying the repeatability of estimated baseline lengths from Onsala to several other sites. The repeatability obtained for baseline length estimates shows that the methods of water vapor radiometry and Kalman filtering offer comparable accuracies when applied to VLBI observations obtained in the climate of the Swedish west coast. For the most frequently measured baseline in this study, the use of WVR data yielded a 13 percent smaller weighted-root-mean-square (WRMS) scatter of the baseline length estimates compared to the use of a Kalman filter. It is also clear that the 'best' minimum elevationi angle for VLBI observations depends on the accuracy of the determinations of the total propagation delay to be used, since the error in this delay increases with increasing air mass.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 6541-655
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Effects of atmospheric modeling errors on determinations of baseline vectors from very long baseline interferometry (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An investigation is conducted in order to expose errors in the formula for the elevation angle dependence of the hydrostatic atmospheric propagation delay, called the mapping function. A series of special VLBI experiments that involve a large fraction of group delay data from very low elevation angles are performed. Twenty-two experiments, each 26 hours in duration, were performed using VLBI antennas at Goldstone, California and at Westford, Massachusetts. Elevation angle cutoff tests were used to examine the contribution of these errors to the estimates of the vertical coordinate of site position. This contribution is determined to be about 19 mm. It is also found that, for the spacing of 1-2 months between experiments, the mapping function errors do not exhibit a coherent annual signature, but appear to be random in the long term.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 643-650
    Format: text
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    NASA TECHNICAL REPORTS
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