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  • Other Sources  (5,793)
  • INSTRUMENTATION AND PHOTOGRAPHY  (3,942)
  • CYBERNETICS  (1,851)
  • 1990-1994  (3,223)
  • 1970-1974  (2,570)
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  • Other Sources  (5,793)
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  • 1
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    Optical devices, instrumentation: A compilation (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Techniques and devices used to solve optical problems - compilation
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-SP-5941(01)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Optical telescope technology (1970)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Design optics and technology for large spaceborne astronomical telescopes
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-SP-233 , Apr 29, 1969 - May 01, 1969; HUNTSVILLE, AL; UNITED STATES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Electronic test instrumentation and techniques - A compilation (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Compilation of electronic test instrumentation and techniques derived from NASA programs
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-SP-5907/02/
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The polarization sensitivity of the liquid xenon imaging telescope (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The properties and the expected performance of a liquid xenon (LXe) gamma-ray imaging telescope, optimized for the MeV energy region, are presented. The unique potential of this telescope as a Compton polarimeter is particularly emphasized. Based on Monte Carlo simulations, we show that the modulation factor is as high as 40% at 1 MeV with a detection efficiency close to 20%. These figures of merit, combined with the excellent background suppression capability of the three-dimensional position sensitive LXe detector, yield sensitivity at the 3 sigma level to polarization fractions as small as a few percent for strong sources, even in a balloon flight.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Astrophysical Journal Supplement Series (ISSN 0067-0049); 92; 2; p. 689-691
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Germanium blocked-impurity-band detector arrays - Unpassivated devices with bulk substrates (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We have fabricated and characterized six-element monolithic arrays of Ge:Ga blocked-impurity-band detectors, with threshold wavelength 220 microns, peak quantum efficiency 14 percent, detective quantum efficiency 9 percent, dark current 300 e(-)/s, and response uniformity better than 4 percent. The devices are described very well by the standard model of blocked-impurity-band detectors and appear to satisfy many of the requirements of low-background astronomical instruments.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Applied Physics (ISSN 0021-8979); 74; 6; p. 4199-4206.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The performance of a new instrument for in situ measurements of ClO in the lower stratosphere (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Abundances of chlorine oxide (ClO) have been measured from 16 km to 30 km by a new balloon-borne in situ instrument developed from an optical design flown previously on the NASA ER-2 aircraft. This instrument, a prototype for one to be flown on the Perseus remotely piloted aircraft, was one-third the weight of that on the ER-2, yet retained the high precision and accuracy necessary for detailed photochemical studies of the lower stratosphere. In this paper we discuss the performance of the instrument during its first flight on March 31, 1991 over eastern New Mexico.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 17; p. 1791-1794.
    Format: text
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  • 7
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    Fuel-optimal slewing of an experimental hinged-free beam (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: With the recent development of numerical methods for exactly solving larger order fuel-optlmal control problems, the implementation of exact real-time fuel-optimal control becomes possible. This paper describes a physical experiment in which a hinged-free beam is slewed in a fuel-optimal manner. A comparison between experimental results and the analytical predictions highlights the sources of errors typical of this class of problems.
    Keywords: CYBERNETICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 16; 6; p. 1162-1168.
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Terrestrial applications of NASA space telerobotics technologies (1994)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In 1985 the National Aeronautics and Space Administration (NASA) instituted a research program in telerobotics to develop and provide the technology for applications of telerobotics to the United States space program. The activities of the program are intended to most effectively utilize limited astronaut time by facilitating tasks such as inspection, assembly, repair, and servicing, as well as providing extended capability for remotely conducting planetary surface operations. As the program matured, it also developed a strong heritage of working with government and industry to directly transfer the developed technology into industrial applications.
    Keywords: CYBERNETICS
    Type: AIAA PAPER 94-1235-CP , NASA. Johnson Space Center, Conference on Intelligent Robotics in Field, Factory, Service, and Space (CIRFFSS 1994), Volume 1; p 434-440
    Format: application/pdf
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  • 9
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    Space Station Freedom (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This video presents great model photography along with astronaut activity as practiced in mockup.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ASR-253 , NASA-TM-109636 , NONP-NASA-VT-93-190434
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Decision boundary feature selection for non-parametric classifier (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Feature selection has been one of the most important topics in pattern recognition. Although many authors have studied feature selection for parametric classifiers, few algorithms are available for feature selection for nonparametric classifiers. In this paper we propose a new feature selection algorithm based on decision boundaries for nonparametric classifiers. We first note that feature selection for pattern recognition is equivalent to retaining 'discriminantly informative features', and a discriminantly informative feature is related to the decision boundary. A procedure to extract discriminantly informative features based on a decision boundary for nonparametric classification is proposed. Experiments show that the proposed algorithm finds effective features for the nonparametric classifier with Parzen density estimation.
    Keywords: CYBERNETICS
    Type: Society for Imaging Science and Technology, Annual Conference; May 12, 1991 - May 17, 1991; Saint Paul, MN; United States|; 4 p.
    Format: text
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