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  • Other Sources  (4)
  • 2020-2021
  • 1995-1999  (2)
  • 1970-1974  (2)
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  • 1
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    Atomic force microscopy imaging of fragments from the Martian meteorite ALH84001 (1998)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A combination of scanning electron microscopy (SEM) and environmental scanning electron microscopy (ESEM) techniques, as well as atomic force microscopy (AFM) methods has been used to study fragments of the Martian meteorite ALH84001. Images of the same areas on the meteorite were obtained prior to and following gold/palladium coating by mapping the surface of the fragment using ESEM coupled with energy-dispersive X-ray analysis. Viewing of the fragments demonstrated the presence of structures, previously described as nanofossils by McKay et al. (Search for past life on Mars--possible relic biogenic activity in martian meteorite ALH84001. Science, 1996, pp. 924-930) of NASA who used SEM imaging of gold-coated meteorite samples. Careful imaging of the fragments revealed that the observed structures were not an artefact introduced by the coating procedure.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Journal of microscopy (ISSN 0022-2720); Volume 189 Pt 1; 2-7
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    ERTS-1 image enhancement by optically combining density slices (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technique of density slicing using a photographic film and its application to enhancement of ERTS-1 imagery has proved to be useful for mapping varigated areal phenomena and provides a useful supplement ot the I2S MiniAddcol viewing system. The intial experiments conducted with this film were encouraging, and indicated that this technique of density slicing using readily accessible darkroom facilities and simple darkroom procedures allows rapid, accurate, and facile interpretation of certain areal phenomena to be made from the imagery. The distribution of the tree yucca, Yucca brevifolia Jaegeriana, in the eastern Mojave Desert of Southern California and southern Nevada was used as an example to test the accuracy of the technique for mapping purposes. The distribution was mapped at a relatively high level of accuracy.
    Keywords: GEOPHYSICS
    Type: PAPER-I11 , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 1179-1185
    Format: application/pdf
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  • 3
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    ERTS-1 image enhancement by optically combining density slices (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: ERTS-1 image enhancement by optically combining density slices
    Keywords: GEOPHYSICS
    Type: E73-10189 , PAPER-I11 , NASA. Goddard Space Flight Center Interpretation Tech. Develop.; p 131
    Format: text
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  • 4
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    Algorithm for Estimating the Plume Centerline Temperature and Ceiling Jet Temperature in the Presence of a Hot Upper Layer (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The experiments were designed to provide insight into the behavior of jet fuel fires in aircraft hangars and to study the impact of these fires on the design and operation of a variety of fire protection systems. As a result, the test series included small fires designed to investigate the operation of UV/IR detectors and smoke detectors as well as large fires which were used to investigate the operation of ceiling mounted heat detectors and sprinklers. The impact of the presence or absence of draft curtains was also studied in the 15 m hangar. It is shown that in order to predict the plume centerline temperature within experimental uncertainty, the entrainment of the upper layer gas must be modeled. For large fires, the impact of a changing radiation fraction must also be included in the calculation. The dependence of the radial temperature profile of the ceiling jet as a function of layer development is demonstrated and a ceiling jet temperature algorithm which includes the impact of a growing layer is developed.
    Keywords: Inorganic and Physical Chemistry
    Type: PB98-146152 , NISTIR-6178
    Format: text
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