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  • COMMUNICATIONS  (511)
  • CHEMISTRY
  • 1970-1974  (233)
  • 1965-1969  (698)
  • 1974  (233)
  • 1968  (698)
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  • 1970-1974  (233)
  • 1965-1969  (698)
Year
  • 1
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    Band model representations for high temperature water vapor and carbon dioxide (1968)
    In:  CASI
    Details
    Publication Date: 2005-11-13
    Description: Band models for high temperature water vapor and carbon dioxide
    Keywords: CHEMISTRY
    Type: NASA MOL. RADIATION AND ITS APPL. TO DIAGNOSTIC TECH. 8 JAN. 1968 (SEE N68-18082 08-33) P 19-35
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On the use of adaptive techniques to improve antenna servo accuracy (1968)
    In:  CASI
    Details
    Publication Date: 2006-02-15
    Description: Systems analysis of antenna tracking servo systems and adaptive techniques for improving accuracy
    Keywords: COMMUNICATIONS
    Type: NASA. GODDARD SPACE FLIGHT CENTER THE ASEE-UNIV. OF MD.-CATHOLIC UNIV.-NASA SUMMER FAC. FELLOWSHIP PROGRAM APR. 1968; P 123-143
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A survey on some mathematical models of the very low frequency wave propagation (1968)
    In:  CASI
    Details
    Publication Date: 2006-02-15
    Description: Mathematical models on very low frequency wave propagation, based on waveguide mode, zonal harmonics, eigenfunctions, and wave theory
    Keywords: COMMUNICATIONS
    Type: NASA. GODDARD SPACE FLIGHT CENTER THE ASEE-UNIV. OF MD.-CATHOLIC UNIV.-NASA SUMMER FAC. FELLOWSHIP PROGRAM APR. 1968; P 1-43
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Transfer functions of the Rosman 1 antenna structure (1968)
    In:  CASI
    Details
    Publication Date: 2006-02-15
    Description: Resonant frequencies, vibration modes, and transfer functions of Rosman 1 antenna structure
    Keywords: COMMUNICATIONS
    Type: NASA. GODDARD SPACE FLIGHT CENTER THE ASEE-UNIV. OF MD.-CATHOLIC UNIV.-NASA SUMMER FAC. FELLOWSHIP PROGRAM APR. 1968; P 161-183
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    NASA TECHNICAL REPORTS
  • 5
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    Retrodirective antennas and the multipath problems associated with their use on the proposed orbiting data relay network (1968)
    In:  CASI
    Details
    Publication Date: 2006-02-15
    Description: Retrodirective antennas and multipath transmission problems associated with use on proposed orbiting data relay network
    Keywords: COMMUNICATIONS
    Type: NASA. GODDARD SPACE FLIGHT CENTER THE ASEE-UNIV. OF MD.-CATHOLIC UNIV.-NASA SUMMER FAC. FELLOWSHIP PROGRAM APR. 1968; P 145-160
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  • 6
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    An investigation of methods for the experimental determination of PCM signal to noise ratio (1968)
    In:  CASI
    Details
    Publication Date: 2006-02-15
    Description: Experimental determination of pulse code modulation signal to noise ratio, and methods of signal analysis for pulse code modulation analog data
    Keywords: COMMUNICATIONS
    Type: NASA. GODDARD SPACE FLIGHT CENTER THE ASEE-UNIV. OF MD.-CATHOLIC UNIV.-NASA SUMMER FAC. FELLOWSHIP PROGRAM APR. 1968; P 89-103
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  • 7
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    Radio communications with extra-terrestrial civilizations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Communications between civilizations within our galaxy at the present level of radio engineering is possible, although civilizations must begin to search for each other to achieve this. If an extra-terrestrial civilization possessing a technology at our level wishes to make itself known and will transmit special radio signals to do this, then it can be picked up by us at a distance of several hundreds of light years using already existing radio telescopes and specially built radio receivers. If it wishes, this civilization can also send us information without awaiting our answer.
    Keywords: COMMUNICATIONS
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 79-82
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  • 8
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    Intermediate memory devices (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Several methods of transfer and processing of data whose practical implementation requires operational memory devices are described. Devices incorporating multistable elements are proposed and their main parameters are given. The possibility of using the proposed devices for storing information for transmission in space radio communications channels is examined.
    Keywords: COMMUNICATIONS
    Type: Space Res. in the Ukraine, No. 3 (NASA-TT-F-15537); p 155-162
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  • 9
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    Electromagnetic processes in the atmosphere of pulsars (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The work consists of two parts. The first deals with the fine structure of radio pulses. Based on kinetic theory, processes occurring in the plasma shell of a pulsar when external electromagnetic radiation is present are investigated. It is shown that electromagnetic waves cause electrons to drift relative to ions, and initiate longitudinal oscillations. A dispersion equation describing the longitudinal oscillations in magnetized plasma is derived. Conditions for excitation of oscillations are found. Correlation functions of electron density are calculated, along with the coefficients of electromagnetic wave scattering. It is shown that variations in the amplitude of pulsar pulses are associated with scintillations caused by fluctuations in the plasma electron density. The second part of the study presents a mechanism for the radio emission of pulsars. The model of a rotating and a pulsating star, a neutron star with dipolar or more complex magnetic field, is examined.
    Keywords: COMMUNICATIONS
    Type: Space Res. in the Ukraine, No. 3, (NASA-TT-F-15537); p 44-53
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  • 10
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    The tropospheric calibration model for Mariner Mars 1971 (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The effects of the troposphere on arrival time, range, and range rate measurement of radio signals propagating from spacecraft are examined. A tropospheric calibration model which takes into account seasonal variations, various elevations, and apparent location changes was developed. A comparison was made of the effects before and after calibration. Without calibration, a 16-m change in the distance off the spin axis, is induced for a 10-deg minimum elevation symmetrical pass. Even after calibration with the old model, the error in spin axis is still greater than 1 m. Calibration results and estimated uncertainties of the model are given in tabular form. Test results also show that the model met the required accuracy for the Mariner Mars 1971 mission.
    Keywords: COMMUNICATIONS
    Type: Tracking System Analytic Calibration Activities for the Mariner Mars 1971 Mission; p 61-76
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