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  • 1
    Electronic Resource
    Electronic Resource
    Changes in the fine structure of the testicular Leydig cells of the seasonally-breeding bat, Myotis adversus (1980)
    Springer
    Cell & tissue research 210 (1980), S. 339-347 
    Details
    ISSN: 1432-0878
    Keywords: Seasonal breeding ; Leydig cells ; Ultrastructure ; Bat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Leydig cells of the bat, Myotis adversus, have been examined by electron microscopy throughout fourteen months. During the breeding season the Leydig cells become hypertrophied and are characterised by prominent areas of agranular endoplasmic reticulum and numerous small, membrane-bound granules. Microperoxisomes are also observed. During the period of testicular regression. Leydig cell size and the number of membrane-bound granules are greatly reduced. Lipid droplets and dense bodies are more numerous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237621
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Configuration study for a 30 GHz monolithic receive array, volume 1 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Gregorian, Cassegrain, and single reflector systems were analyzed in configuration studies for communications satellite receive antennas. Parametric design and performance curves were generated. A preliminary design of each reflector/feed system was derived including radiating elements, beam-former network, beamsteering system, and MMIC module architecture. Performance estimates and component requirements were developed for each design. A recommended design was selected for both the scanning beam and the fixed beam case. Detailed design and performance analysis results are presented for the selected Cassegrain configurations. The final design point is characterized in detail and performance measures evaluated in terms of gain, sidelobe level, noise figure, carrier-to-interference ratio, prime power, and beamsteering. The effects of mutual coupling and excitation errors (including phase and amplitude quantization errors) are evaluated. Mechanical assembly drawings are given for the final design point. Thermal design requirements are addressed in the mechanical design.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-174697-VOL-1 , NAS 1.26:174697-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Configuration study for a 30 GHz monolithic receive array: Technical assessment (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The current status of monolithic microwave integrated circuits (MMICs) in phased array feeds is discussed from the point of view of cost performance, reliability, and design considerations. Transitions to MMICs, compatible antenna radiating elements and reliability considerations are addressed. Hybrid antennas, feed array antenna technology, and offset reflectors versus phased arrays are examined.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-174697 , NAS 1.26:174697
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Configuration study for a 30 GHz monolithic receive array, volume 2 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The formalism of the sidelobe suppression algorithm and the method used to calculate the system noise figure for a 30 GHz monolithic receive array are presented. Results of array element weight determination and performance studies of a Gregorian aperture image system are also given.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-174697-VOL-2 , NAS 1.26:174697-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Shuttle STS-2 mission communication systems RF coverage and performance predictions. Volume 1: Ascent (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The RF communications capabilities and nominally expected performance for the ascent phase of the second orbital flight of the shuttle are provided. Predicted performance is given mainly in the form of plots of signal strength versus elapsed mission time for the STDN (downlink) and shuttle orbiter (uplink) receivers for the S-band PM and FM, and UHF systems. Performance of the NAV and landing RF systems is treated for RTLS abort, since in this case the spacecraft will loop around and return to the launch site. NAV and landing RF systems include TACAN, MSBLS, and C-band altimeter. Signal strength plots were produced by a computer program which combines the spacecraft trajectory, antenna patterns, transmit and receive performance characteristics, and system mathematical models. When available, measured spacecraft parameters were used in the predictions; otherwise, specified values were used. Specified ground station parameter values were also used. Thresholds and other criteria on the graphs are explained.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-84853 , JSC-17625-VOL-1 , NAS 1.15:84853
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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