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  • GEOPHYSICS  (111)
  • ENERGY PRODUCTION AND CONVERSION  (109)
  • Analytical Chemistry and Spectroscopy  (78)
  • ASTROPHYSICS  (74)
  • STRUCTURAL MECHANICS  (54)
  • SOLAR PHYSICS  (52)
  • COMMUNICATIONS
  • 1975-1979  (463)
  • 1970-1974
  • 1960-1964  (25)
  • 1978  (463)
  • 1962  (25)
Collection
Keywords
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  • 1975-1979  (463)
  • 1970-1974
  • 1960-1964  (25)
Year
  • 1
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A low-energy spectrometer for the X-ray analysis of plutonium and plutonium-containing materials has been built. We use ultra-thin window to maintain different pressures and contamination level in the spectrometers's sample and crystal chambers. Ultra-thin windows are also used on the X-ray tube and detector. Methods have been developed by which the spectrometer can analyze both metal and loose-powder samples. Representative calibration spectra are presented for the fluorine band in polyfluoroethylene, the oxygen band in α-Al2 O3, and the carbon band in graphite. Experimental spectra are presented for the fluorine band in PuF3 and for the oxygen ban in PuO2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: The objective was to investigate and develop chemical vapor deposition (CVD) techniques for the growth of large areas of Si sheet on inexpensive substrate materials, with resulting sheet properties suitable for fabricating solar cells that would meet the technical goals of the Low Cost Silicon Solar Array Project. The program involved six main technical tasks: (1) modification and test of an existing vertical-chamber CVD reactor system; (2) identification and/or development of suitable inexpensive substrate materials; (3) experimental investigation of CVD process parameters using various candidate substrate materials; (4) preparation of Si sheet samples for various special studies, including solar cell fabrication; (5) evaluation of the properties of the Si sheet material produced by the CVD process; and (6) fabrication and evaluation of experimental solar cell structures, using impurity diffusion and other standard and near-standard processing techniques supplemented late in the program by the in situ CVD growth of n(+)/p/p(+) sheet structures subsequently processed into experimental cells.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158031 , DOE/JPL-954372-78/6 , C76-320/501
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-27
    Description: The results of a program to design and fabricate an unshielded actively cooled structural panel for a hypersonic aircraft are presented. The design is an all-aluminum honeycomb sandwich with embedded cooling passages soldered to the inside of the outer moldline skin. The overall finding is that an actively cooled structure appears feasible for application on a hypersonic aircraft, but the fabrication process is complex and some material and manufacturing technology developments are required. Results from the program are summarized and supporting details are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2959
    Format: application/pdf
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  • 4
    Publication Date: 2019-06-27
    Description: On November 9, 1972 Imp 7 was in the plasma sheet from 0430 to 1000 UT and detected strong earthward plasma flows. A series of nine temporal pulsations were observed to vary in bulk speed from 0 to about 1500 km/s and to occur at 15-30 minute intervals. A positive correlation exists between the speed variations and changes in the standard deviation of the magnetic field. Evident periodicity was not found corresponding to Imp 7 pulsations and other magnetospheric or solar wind data. It is felt that the pulsations may indicate that tail reconnection is unsteady in periods of 10-30 minutes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; May 1
    Format: text
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 671-673 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Combined gas chromatography mass spectrometry was used to separate and identify a carrageenan component suspected of being the acid ketal 4,6-O-(1-carboxyethylidene)-D-galactose. The mass spectral fragmentation pattern is presented as evidence for the presence of this component in the carrageenan from Petrocelis middendorfii (P. francisana).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 535-540 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A data base containing approximately 4000 13C nuclear magnetic resonance spectra has been assembled. The spectra have been evaluated and all the corresponding compounds have been registered by the Chemical Abstracts Service (CAS). The data base is available to the international scientific community on magnetic tape or microfiche and is also the basis of a search system operating upon an international computer network.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 39-42 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of nine 2-diazoacetophenones are reported. Rearrangements are examined by means of low electron voltage measurements, deuterium labelling and high resolution studies.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete 1H and 13C NMR assignments for 3,6-epoxypentacyclo[6.2.2.02,7.04,10.05,9]dodecane and 3,6-epoxypentacyclo[6.2.1.02,7.04,10.05,9]undecane are reported. The difference between the 1H and 13C chemical shifts and one-bond proton-carbon coupling constants of these two compounds are adequately explained by the difference in the hybridization of the C—H bonds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 163-166 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical ionization mass spectra of exo- and endo-2-norbornanols and their phenylurethane derivatives have been obtained with several reactant ions. Small differences are noted in the abundances of norbornyl and [M+H]+ ions for the phenylurethane derivatives: more norbornyl ions with the exo compounds. Relative rate constants for decomposition of [M+H]+ ions, kexo/kendo ≅ 1-2. No evidence was found for s̰-participation in the decomposition of these ions. The i-C4H10 chemical ionization spectrum of endo-2-norbornanol contains a much greater abundance of [M-H]+ ions than the i-C4H10 chemical ionization spectrum of exo-2-norbornanol. This difference presumably results from steric hindrance toward attack of the endo hydrogen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 397-401 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The ion cyclotron resonance spectra of anisol, 3-methylanisol, phenetol, 3-methylphenetol and thioanisol at pressures of 10-6 Torr resemble the normal mass spectra. Above 10-5 Torr the spectra show signals due to product ions. As seen from double resonance measurements most product ions are formed by the reaction of a fragment ion with a neutral ether molecule under elimination of alkyl, alkoxy alkylthioradicals or of ethylene. Apart from the molecular ion radical ions do not participate in ion-molecule reactions.
    Notes: Die ICR-Spektren von Anisol, 3-Methylanisol, Phenetol, 3-Methylphenetol und Thioanisol, die bei 10-6 Torr weitgehend mit den normalen Massenspektren übereinstimmen, zeigen oberhalb von 10-5 Torr zahlreiche Signale von Produktionen. Doppelresonanzmessungen ergaben, daß die meisten Produktionen durch Reaktion eines Fragmentions mit einem Äthermolekül unter Abspaltung eines Alkyl-, Alkoxy- oder Thioalkylradikals bzw. von Äthylen entstanden sind. Daneben finden sich einzelene Produktionen (möglicher-weise Ion-Molekül-Komplexe), die durch Zusammentreten von Ionen mit Äthermolekülen ohne Eliminierung entstanden sind. Radikalionen, mit Ausnahme des Molekular ions, nehmen nicht an den Ionen-Molekül-Reaktionen teil.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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