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  • Inorganic Chemistry  (1,590)
  • Analytical Chemistry and Spectroscopy  (734)
  • Chemical Engineering  (673)
  • Physics  (504)
  • INSTRUMENTATION AND PHOTOGRAPHY  (381)
  • Animals  (357)
  • 2020-2022
  • 1995-1999
  • 1985-1989
  • 1975-1979  (2,989)
  • 1970-1974
  • 1965-1969
  • 1960-1964  (1,250)
  • 1978  (2,989)
  • 1964  (1,250)
Collection
Keywords
Publisher
Years
  • 2020-2022
  • 1995-1999
  • 1985-1989
  • 1975-1979  (2,989)
  • 1970-1974
    • +
Year
  • 1
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    Heyman wins third IR-100 award (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-NEWS-RELEASE-78-147 , P78-10152
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Use of computers to exclude the influence of radiometer instability upon measurement results (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A radiometer, practically insensitive to great fluctuations in the equipment amplification coefficient, was developed by dividing the useful signal by a reference signal and modulating the two signals at different frequencies. The signals are simultaneously separated by corresponding synchronous detectors and recorded over two channels. The operation is simplified by replacing the continuous signals by a sampling of discrete values, and using a digital computer. The four steps involved in the process are described and a block diagram is included. This technique not only directly connects the radiometer with the computer, but also records all data provided by the control and signal channels.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75374
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Differential laser absorption monitoring of the atmosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In the airborne detection system of atmospheric constituents and pollutants described, double-ended differential absorption measurement is accomplished by rapidly current tuning the wavelength of a PbSSe diode laser across a single line of the species under consideration. As the laser wavelength sweeps periodically across the absorption line, the laser beam is amplitude modulated and is then synchronously detected. With this technique, a minimum detectable differential transmission of 0.02 percent is obtained for a 1-sec integration time.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Plenary Meeting; May 29, 1978 - Jun 10, 1978; Innsbruck; Austria
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    System of Programmed Modules for Measuring Photographs with a Gamma-Telescope (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Physical experiments using tracking cameras resulted in hundreds of thousands of stereo photographs of events being received. To process such a large volume of information, automatic and semiautomatic measuring systems are required. At the Institute of Space Research of the Academy of Science of the USSR, a system for processing film information from the spark gamma-telescope was developed. The system is based on a BPS-75 projector in line with the minicomputer Elektronika 1001. The report describes this system. The various computer programs available to the operators are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75560 , PR-386
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Synchronized flash photolysis and pulse deposition in matrix isolation experiments (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: An apparatus is described which permits flash photolysis of a pulse-deposited gas mixture in a matrix isolation experiment. This technique obviates the limitations of in situ photolysis imposed by the cage effect and by secondary photolysis. The matrix is deposited in pulses at 30-s intervals and photolyzed sequentially by four synchronized flashlamps approximately 1 ms before the pulse strikes the cold surface. Pulsed deposition maintains adequate isolation and causes line narrowing, which enhances spectral sensitivity. The efficacy of flash photolysis combined with pulsed deposition for producing and trapping transient species was demonstrated by infrated detection of CF3 (from photolysis of CF3I/Ar mixtures) and of ClCO (from photolysis of Cl2/CO/Ar mixtures). The apparatus was used to study the photolytic decomposition of gaseous tricarbonylironcyclobutadiene, C4H4Fe(CO)3. The results indicate that the primary photolytic step is not elimination of C4H4, as suggested earlier, but rather of CO.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 49; 7; p. 913-918
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The nuclear radiation monitor for the Spacelab/Shuttle (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: A 5 inch by 5 inch diameter sodium iodide scintillation crystal, viewed by a 5 inch photomultiplier was designed to be mounted near the center of the shuttle payload bay to quantitatively measure the neutron and gamma ray environment during the second Spacelab mission. The expected energy resolution is 8% FWHM at 662 keV. The detector will operate in an energy range from 0.1 to 20 MeV. A charged anticoincidence shield consisting of a 1 cm thick plastic scintillator viewed by three 2 inch photomultiplier tubes, covers the crystal detector which has nearly omnidirectional response.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.; p 479-483
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A Review of Photography of the Earth from Sounding Rockets and Satellites (1964)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Photography of earth surface from sounding rockets and satellites
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-1868
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    An overview of the NASA technology utilization program (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The NASA technology utilization program is described. The transfer of that technology is described along with the publications which distribute the technological information.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Preliminary Appl. and Evaluation Results. Lixiscope; p 67-77
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Progress on millimeter wave Josephson junction mixers (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preset, recyclable Nb point contacts are tested as low-noise Josephson mixers at a signal frequency of 115 GHz. The best result achieved is a mixer noise temperature (single sideband) of 120 K with unity conversion efficiency (SSB) for a junction at 6 K. Variation of mixer properties with temperature and other parameters is presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Future trends in superconductive electronics; Mar 23, 1978 - Mar 25, 1978; Charlottesville, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Signal detection in l/f noise of SQUID magnetometers (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is shown that the variance on the SQUID power spectrum in the l/f low frequency region is well behaved, i.e., any small frequency band may be treated as white noise in standard power spectrum estimation theory. Specifically a calibration signal is examined at 0.017 Hz with an equivalent energy referred to the SQUID input coil of 1 times 10 to the -30th J and a digitally recorded and analyzed record of 140 hr duration obtained an optimum S/N better than 400. The results are in good agreement with theory. In addition no deviation from the l/f dependence of the noise energy spectrum is seen down to frequencies below 10 to the -5th Hz. A commercially available SQUID and electronics system were used.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Future trends in superconductive electronics; Mar 23, 1978 - Mar 25, 1978; Charlottesville, VA
    Format: text
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    NASA TECHNICAL REPORTS
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