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  • Other Sources  (3)
  • CYBERNETICS  (1)
  • ENVIRONMENT POLLUTION  (1)
  • Fault zone  (1)
  • Chavez
  • 1990-1994  (3)
  • 1
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    In:  J. Geophys. Res., Würzburg, Pergamon, vol. 98, no. 44, pp. 8211-8223, pp. B05S01, (ISSN: 1340-4202)
    Publication Date: 1993
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Tectonics ; Fault zone ; Reflection seismics ; JGR
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  • 2
    Publication Date: 2013-08-31
    Description: There is a wide range of complexity in the various telerobotic servicing tasks performed in subsea, space, and hazardous material handling environments. Experience with telerobotic servicing has evolved into a knowledge base used to design tasks to be 'telerobot friendly.' This knowledge base generally resides in a small group of people. Written documentation and requirements are limited in conveying this knowledge base to serviceable equipment designers and are subject to misinterpretation. A mathematical model of task complexity based on measurable task parameters and telerobot performance characteristics would be a valuable tool to designers and operational planners. Oceaneering Space Systems and TRW have performed an independent research and development project to develop such a tool for telerobotic orbital replacement unit (ORU) exchange. This algorithm was developed to predict an ORU exchange degree of difficulty rating (based on the Cooper-Harper rating used to assess piloted operations). It is based on measurable parameters of the ORU, attachment receptacle and quantifiable telerobotic performance characteristics (e.g., link length, joint ranges, positional accuracy, tool lengths, number of cameras, and locations). The resulting algorithm can be used to predict task complexity as the ORU parameters, receptacle parameters, and telerobotic characteristics are varied.
    Keywords: CYBERNETICS
    Type: NASA. Johnson Space Center, Sixth Annual Workshop on Space Operations Applications and Research (SOAR 1992), Volume 2; p 616-625
    Format: application/pdf
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  • 3
    Publication Date: 2013-08-31
    Description: Intense solar activity during 1989 prompted six major particle events. Four of these occurred between August and December. Energetic solar protons are a natural source of ozone depletion due to the nitric oxides they produce in the polar atmospheres. In particular, modelling (Reid et al., 1991) of an event that peaked on October 20 (with greater than 10 MeV proton flux of 73000 particles sq cm s(exp -1) ster(exp -1) yields 55 percent column density enhancements of NO over the southern polar cap. Total column ozone data from the total ozone ,mapping spectrometer (TOMS) instrument aboard the Nimbus 7 satellite used at times when solar illumination facilitates measurements by TOMS over the entire southern polar regions. The impact of odd nitrogen enhancements on the spatial extent of low total column ozone and of the total ozone mass, over a region August to December. Comparisons are made with previous years (1984 to 1988) of moderate solar activity. The effect, if any, of these events on ozone during times of heterogeneous chlorine chemistry and dynamic processes is discussed.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 1; p 405-408
    Format: application/pdf
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