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  • Chemistry  (13)
  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (6)
  • 1980-1984  (8)
  • 1970-1974  (8)
  • 1925-1929  (3)
  • 1
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    Gauge invariance, current conservation, and GIAO's. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The well-known relationship between gauge invariance and current conservation is exhibited within the usual quantum mechanical formalism. It is then shown that the use of Gauge Invariant Atomic Orbitals does not necessarily lead to the expected current conservation. The reason is found to lie in the constrained nature of the gauge invariance which is provided by the use of GIAO's. It is concluded that this invariance is, of itself, no argument in favor of their use.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 58; Feb. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Determination of molecular properties by the method of moments (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Method of moments for determining wave functions used in calculating molecular properties
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; ACE(
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Gauge invariance, current conservation, and GIAO's (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The well known relationship between gauge invariance and current conservation is exhibited within the usual quantum mechanical formalism. It is then shown that the use of gauge-invariant atomic orbitals (GIAO) does not necessarily lead to the expected current conservation. The reason is found to lie in the constrained nature of the gauge invariance which is provided by the use of GIAO's. It is concluded that this invariance is, of itself, no argument in favor of their use.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-129246 , WIS-TCI-491
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Small-pitch-angle synchrotron radiation (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Angular distribution of small-pitch-angle synchrotron radiation
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-117902 , SU-IPR-405
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    On energy bounds derived from the conjugate eigenvalue problem (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Atomic system ground state energy upper bound, considering internuclear distances and removal of restriction for negative definite potential energy operator
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Note on the symmetry of perturbed Hartree-Fock and X-alpha wavefunctions (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It is shown that the first order orbitals for X-alpha or Hartree-Fock atoms perturbed by multipole electric fields have the expected symmetry properties.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-138259 , WIS-TCI-509
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Simultaneous melting and freezing in the impingement region of a liquid jet (1980)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 26 (1980), S. 743-751 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An experimental investigation of an impinging water jet freezing on a melting solid surface has been carried out. Attention was focused on the stagnation region of an axisymmetric jet. In the experiment, a water jet was directed upward against the lower end of a meltable rod, having a diameter about twice that of the jet orifice. Solid octane (m.p. - 56.5°C) and solid mercury (m.p. - 38.9°C) served as the meltable materials. A laminar-axisymmetric flow model was developed to describe melting heat transfer in the presence of jet solidification within the impingement region. Measurements of the melting rate and conditions for the onset of jet solidification were found to agree quite well with the values predicted with this model.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690260507
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Growth of nickel sulfate in a laboratory-scale fluidized-bed crystallizer (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 678-687 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Growth and dissolution rates of nickel sulfate α-hexahydrate were measured as functions of the concentration driving force in a laboratory-scale fluidized-bed crystallizer for the temperature range 35° to 50°C and the crystal size range 0.5 to 4.0 mm.Dissolution rates at a given temperature and crystal size were first order in the concentration driving force. Growth rates were about one-quarter of dissolution rates and depended on a higher exponent (around 1.3) of the concentration driving force. This exponent was not significantly affected by variations in crystal size, but decreased as temperature increased. The apparent variation of growth rate itself with crystal size at constant temperature was slight. Growth rates were found to be insensitive to solids concentration.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690200408
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of molecular size and configuration on diffusion in microporous membranes (1981)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 27 (1981), S. 952-959 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Effects of molecular size and configuration on hindered diffusion were examined by measuring diffusion of two series of uncharged macromolecules through track-etch membranes with uniform and well-defined pore geometry. At any given Stokes-Einstein radius, diffusivities in small pores were lower for ficoll (crosslinked structure) than for dextran (more nearly linear structure).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690270611
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  • 10
    Electronic Resource
    Electronic Resource
    Environmental stress crack growth in medium-density polyethylene pipe (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1049-1056 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260327
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