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  • 1980-1984  (392)
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Year
  • 1
    Call number: SR 90.0088(39)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 102 S.
    Series Statement: Smithsonian contributions to paleobiology 39
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(55)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: VI, 336 S.
    Series Statement: Smithsonian contributions to paleobiology 55
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Call number: SR 90.0088(56)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 41 S.
    Series Statement: Smithsonian contributions to paleobiology 56
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Publication Date: 2013-08-31
    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: JSC-17625-VOL-1 , NASA-TM-84853 , NAS 1.15:84853
    Format: application/pdf
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  • 5
    Publication Date: 2013-08-31
    Description: Data for evaluating the effects of moisture and temperature on the integrity of fiber composite components was gathered. In particular, the static and cyclic performance of three composite laminates containing flaws was investigated at room temperature and at 422 K (300 F) in wet and dry conditions.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-165213 , NAS 1.26:165213
    Format: application/pdf
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  • 6
    Publication Date: 2013-08-31
    Description: A series of 154 in-flight emergencies as reported to the Aviation Safety Reporting System are described. The various types of emergencies are examined and an attempt is made to determine the human errors and other factors associated with each incident, as well as the measures taken to resolve the emergency. It is concluded that nearly one half of those emergencies reported were related to failure or malfunction of aircraft subsystems. Of all the emergencies, nearly one quarter were associated with power plant failure. Other frequently encountered emergency types are associated with operation in instrument meteorological conditions without appropriate clearance or qualification, and with low fuel state situations. Human error is prominently featured in many of the incidents, appearing in the actions of pilots and air traffic controllers.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-166166
    Format: application/pdf
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  • 7
    Publication Date: 2013-08-31
    Description: Some 258 reports from more than 23,000 documents in the files of the Aviation Safety Reporting System (ASRS) were found to be to the hazard of flight into terrain with no prior awareness by the crew of impending disaster. Examination of the reports indicate that human error was a casual factor in 64% of the incidents in which some threat of terrain conflict was experienced. Approximately two-thirds of the human errors were attributed to controllers, the most common discrepancy being a radar vector below the Minimum Vector Altitude (MVA). Errors by pilots were of a much diverse nature and include a few instances of gross deviations from their assigned altitudes. The ground proximity warning system and the minimum safe altitude warning equipment were the initial recovery factor in some 18 serious incidents and were apparently the sole warning in six reported instances which otherwise would most probably have ended in disaster.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-166230
    Format: application/pdf
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  • 8
    Publication Date: 2016-06-07
    Description: The environment in which a LORAN-C Timing Receiver may function effectively depends to a large extent on the techniques utilized to insure that interfering signals within the pass band of the unit are neutralized. The baseline performance manually operated timing receivers is discussed and the basic design considerations and necessary parameters for an automatic unit utilizing today's technology are established. Actual performance data is presented comparing the results obtained from a present generation timing receiver against a new generation microprocessor controlled automatic acquisition receiver. The achievements possible in a wide range of signal to noise situations are demonstrated.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA. Goddard Space Flight Center Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 417-443
    Format: application/pdf
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  • 9
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    Unknown
    In:  Other Sources
    Publication Date: 2016-06-07
    Description: Methods of destructive physical analysis (DPA) are suggested which might have more usefulness if the procedures followed lines of accelerated testing. A brief presentation of DPA procedures is followed by a discussion of their value.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Marshall Space Flight Center Capacitor Technol., Appl. and Reliability; p 125-129
    Format: text
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  • 10
    Publication Date: 2016-03-09
    Description: A spray coating apparatus is provided for rotating a workpiece relative to a spray station to obtain a uniform coating of the workpiece. In a typical example, the workpiece comprises a ceramic tile which is to be coated with a ceramic coating and the tile is to be used as a reusable component of the thermal protection system for a space shuttle. The apparatus for rotating the workpiece includes a base support having a first rotatable stage for rotation in the horizontal plane and a second rotatable stage for rotation in a second plane inclined at an angle, such as 45 degrees, to the horizontal plane and the workpiece is supported on this second stage. Thus the workpiece is rotatable in both of two planes of rotation.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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