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  • ASTROPHYSICS  (2,155)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1,189)
  • 1975-1979  (3,344)
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Year
  • 1
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    Use of piezoelectric multicomponent force measuring devices in fluid mechanics (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The characterisitics of piezoelectric multicomponent transducers are discussed, giving attention to the advantages of quartz over other materials. The main advantage of piezoelectric devices in aerodynamic studies is their ability to indicate rapid changes in the values of physical parameters. Problems in the accuracy of measurments by piezoelectric devices can be overcome by suitable design approaches. A practical example is given of how such can be utilized to measure rapid fluctuations of fluid forces exerted on a circular cylinder mounted in a water channel.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75444
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Spectral transformation in the SOFI complex for processing photographic images on the ES computer, part 1 (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A description is given of three programs catalogued in the form of object modules in the library of a system for processing photographic images computer. PFT is the subprogram of the multi-dimensional BPF of real-valued information, in the operative computer memory. INRECO is a subprogram-interface between the real and complex formats for representing two-dimensional spectra and images. FFT2 is a subprogram for calculating the correlation functions of the image using the previous subprograms.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75632-PT-1 , PR-394
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    General properties of HII regions in galaxies (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The structure, electron density, and dimensions of HII regions in galaxies are discussed. These parameters are correlated to the chemical composition gradient along the galactic radius, the dimensions of the three largest HII regions in the galaxy, and the amount of hydrogen in the galaxy, as well as the mass, dimensions, and total optical luminosity of the galaxy. The relationships of HII regions to star formation and galactic nucleus activity are discussed and the kinematic properties of the SB and Sab galaxies are related to the size of HII regions.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75700
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    NASA's present and future sensor technology developments (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's overall sensing, data acquisition, and instrumentation programs are reviewed. The review shows that the trends in advanced sensor technology involve increased use of solid-state sensors, multiapplication sensors, standardized instrumentation, and miniaturized detectors. Examples are given of several new technologies, showing how improvements in sensor operational capability (such as enhanced sensitivity and spectral range) derived from these advances have resulted in relaxed spacecraft stability requirements, mission time savings, and savings in weight, size, and power. The introduction of multiapplication sensors and standardized instrumentation will result in measurement cost reduction and improved compatibility with standardized spacecraft.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 76-977 , Systems Design Driven by Sensors; Oct 18, 1976 - Oct 20, 1976; Pasadena, CA
    Format: text
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  • 5
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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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  • 6
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    On the possibly overluminous triple star, 13 Ceti (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The star system, 13 Ceti, consists of a short-period visual binary whose primary is itself a single-line spectroscopic binary. Currently existing data regarding the considered stellar system are examined, taking into account certain discrepancies. It is pointed out that the spectral type of the combined light of the system complicates any attempt to explain the observed overluminosity in terms of stellar evolution. Additional studies are recommended to clarify remaining questions concerning the characteristics of the stellar system.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 88
    Format: text
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  • 7
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    Analytical and test equipment: A compilation (1975)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A compilation is presented of innovations in testing and measuring technology for both the laboratory and industry. Topics discussed include spectrometers, radiometers, and descriptions of analytical and test equipment in several areas including thermodynamics, fluid flow, electronics, and materials testing.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-SP-5972(03)
    Format: application/pdf
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  • 8
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    Hydrodynamics of primordial black hole formation (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The hydrodynamic picture of the formation of primordial black holes (PBH) at the early stages of expansion of the Universe is considered. It is assumed that close to singularity, expansion occurs in a quasi-isotropic way. Using an EVM, a spherically symmetrical nonlinear problem of the evolution of primary strong deviation from the Fridman solution was solved. What these deviations must be, so that the formation of PBH occurred was clarified. Attention was devoted to the role of pressure gradients. It is pointed out that at the moment of formation of PBH, only a small part of matter enters into it, primarily the component of perturbation. It is also pointed out that at this moment, the mass of PBH essentially is smaller than the mass considered within the cosmic horizon. The possibility of changing the mass of the PBH as a result of accretion is analyzed.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75918 , PR-347
    Format: application/pdf
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  • 9
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    Non-equilibrium processes in interstellar molecules (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The types of nonequilibrium emission and absorption by interstellar molecules are summarized. The observed brightness emission temperatures of compact OH and H2O sources are discussed using the concept of maser amplification. A single thermodynamic approach was used in which masers and anti-masers are considered as heat engines for the theoretical interpretation of the cosmic maser and anti-maser phenomena. The requirements for different models of pumping are formulated and a classification is suggested for the mechanisms of pumping, according to the source and discharge of energy.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75685 , PR-462
    Format: application/pdf
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  • 10
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    Semiconductor millimeter and centimeter wave radiometer for the study of the radiation of an underlying surface (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A theoretical and experimental investigation of a superheterodyne radiometer system with input frequency converter and intermediate frequency modulation is presented. Conditions are found, at which the temperature sensitivity of the device does not deteriorate. A sensitivity function to external parameters (temperature, heterodyne power) of a radiometer system with intermediate frequency modulation and a Schottky diode frequency converter is presented and calculated. Use of a frequency converter at the second harmonic of the heterodyne permitted simplication of the radiometer design and the use of a semiconductor heterodyne. A 3 cm range intermediate frequency amplifier permitted the use of centimeter wave radiometer signals. Fluctuation sensitivity of radiometers with a 1 sec time constant is 0.3 K at 3.4 mm and 0.06 K at 3 cm.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75671 , PR-321
    Format: application/pdf
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