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  • 1
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    Control moment gyro optimization study (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Control moment gyro optimization
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-400
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Adsorption of O2, SO2, and SO3 on nickel oxide. Mechanism for sulfate formation (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Calculations based on the atom superposition and electron delocalization molecular orbital (ASED-MO) technique suggest that O2 will adsorb perferentially end-on at an angle 45 deg from normal on a nickel cation site on the (100) surface of NiO. SO2 adsorption is also stronger on the nickel site; SO2 bonds through the sulfur atom is a plane perpendicular to the surface. Adsorption energies for SO3 on the nickel and oxygen sites are comparable in the perferred orientation in which the SO3 plane is parallel to the surface. On activation, SO3 adsorbed to an O2(-) site forms a trigonal pyramidal SO4 species which yields, with a low barrier, a tetrahedral sulfate anion. Subsequently the anion reorients on the surface. Possibilities for alternative mechanisms which require the formation of Ni3(+) or O2(-) are discussed. NiSO4 thus formed leads to the corrosion of Ni at high temperatures in the SO2+O2/SO3 The SO2+O2/SO3 atmosphere, as discussed in the experimental literature.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-176072 , NAS 1.26:176072
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    NASA TECHNICAL REPORTS
  • 3
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    CO adsorption on (111) and (100) surfaces of the Pt sub 3 Ti alloy. Evidence for parallel binding and strong activation of CO (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The CO adsorption on a 40 atom cluster model of the (111) surface and a 36 atom cluster model of the (100) surface of the Pt3Ti alloy was studied. Parallel binding to high coordinate sites associated with Ti and low CO bond scission barriers are predicted for both surfaces. The binding of CO to Pt sites occurs in an upright orientation. These orientations are a consequence of the nature of the CO pi donation interactions with the surface. On the Ti sites the orbitals donate to the nearly empty Ti 3d band and the antibonding counterpart orbitals are empty. On the Pt sites, however, they are in the filled Pt 5d region of the alloy band, which causes CO to bond in a vertical orientation by 5 delta donation from the carbon end.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-176077 , NAS 1.26:176077
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  • 4
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    Why CO bonds side-on at low coverage and both side-on and upright at high coverage on the Cr(110) surface (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An atom superposition and electron delocalization molecular orbital study of CO adsorption on the Cr(110) surface shows a high coordinate lying down orientation is favored. This is a result of the large number of empty d-band energy levels in chromium, which allows the antibonding counterparts to sigma and pi donation bonds to the surface to be empty. When lying down, backbonding to CO pi sup * orbitals is enhanced. Repulsive interactions cause additional CO to stand upright at 1/4 monolyer coverage. The results confirm the recent experimental study of Shinn and Madey.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-176071 , NAS 1.26:176071
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  • 5
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    Data user's note: Mariner 6 and 7 photographic data (NSSDC ID no. 69-014A-01 and 69-030A-01 (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The availability and assistance in the use of the complete set of Mariner 6 and 7 (1969 14A and 1969 20A) pictorial data are announced. The announcement describes the photographic mission of these Mariner spacecrafts, the television camera system, and the photographs that are available from the National Space Data Center. Two appendixes are included: one is a photographic catalog of all enhanced photographs, designated the maximum discriminability photographs; the other is a series of computer produced graphics that are useful in detailed analysis of the photographs.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-68806 , NSSDC-71-09
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  • 6
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    Apollo 11 lunar photography (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A data user's note is presented which announces the availability of the complete set of Apollo 11 pictorial data and aids investigators in the selection of Apollo 11 photographs for study. In addition, this note provides guidance in the interpretation of the photographs. As background information, brief descriptions of the Apollo 11 mission objectives, photographic equipment, and photographic coverage and quality are included. The National Space Science Data Center (NSSDC) can provide all forms of photographs described in the section on format of available data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-68802 , NSSDC-70-06
    Format: application/pdf
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  • 7
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    Apollo 14 lunar photography. Part 1: Data user's note (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The availability of Apollo 14 pictorial data is announced to aid investigators in the selection of Apollo 14 photographs for study. Guidance in the interpretation of the photographs is provided. As background information, the note includes brief descriptions of the Apollo 14 mission objectives, photographic equipment, and photographic coverage and quality. The National Space Science Data Center (NSSDC) can provide the photographs described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-68813 , NSSDC-71-61A
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  • 8
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    Apollo 13 lunar photography (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A data users' note announces the availability of Apollo 13 pictorial data and aids the investigator in the selection of Apollo 13 photographs for study. This note provides guidance in the interpretation of the photographs. The note includes brief descriptions of the Apollo 13 mission objectives, photographic equipment, and photographic coverage and quality. The National Space Science Data Center (NSSDC) can provide all forms of the photographs described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-68812 , NSSDC-70-18
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  • 9
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    Apollo 12 lunar photography, NSSDC ID no. 69-099A-01 (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Information on the complete set of Apollo 12 photographs is presented to aid the investigator in the selection and interpretation of photographs. Film type and size, magazine, frame numbers, and identifying remarks are given for the 70-mm coverage, S-158 multispectral coverage, 16-mm coverage, and 35-mm stereo coverage. Background information on mission objectives, photographic equipment, and photographic coverage and quality is included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-68808 , NSSDC-70-09
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  • 10
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    Molecular orbital studies in oxidation: Sulfate formation and metal-metal oxide adhesion (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The chemical mechanisms for sulfate formation from sodium chloride and sulfur trioxide, which is a product of jet fuel combustion was determined. Molten sodium sulfate leads to hot corrosion of the protective oxide layers on turbine blades. How yttrium dopants in nidkel-aluminum alloys used in turbine blades reduce the spalling rate of protective alumina films and enhance their adhesion was also determined. Two other fulfate mechanisms were deduced and structure of carbon monoxide on a clean chronium and clean platinum-titanium alloys surfaces was determined. All studies were by use of the atom superposition and electron delocalization molecular orbital (ASED-MO) theory. Seven studies were completed. Their titles and abstracts are given.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-176070 , NAS 1.26:176070
    Format: application/pdf
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