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  • 1
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    Structural modifications in the amino acid lysine induced by soft x‐ray irradiation (1994)
    American Institute of Physics
    Details
    Publication Date: 1994-06-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    The interaction of atomic oxygen with thin copper films (1992)
    American Institute of Physics
    Details
    Publication Date: 1992-02-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    SRB seawater corrosion project (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The corrosion behavior of 2219 aluminum when exposed to seawater was characterized. Controlled corrosion experiments at three different temperatures (30, 60 and 100 C) and two different environments (seawater and 3.5 percent salt solution) were designed to elucidate the initial stages in the corrosion process. It was found that 2219 aluminum is an active catalytic surface for growth of Al2O3, NaCl, and MgO. Formation of Al2O3 is favored at lower temperatures, while MgO is favored at higher temperatures. Visible corrosion products are formed within 30 minutes after seawater exposure. Corrosion characteristics in 3.5 percent salt solution are different than corrosion in seawater. Techniques utilized were: (1) scanning electron microscopy, (2) energy dispersive x-ray spectroscopy, and (3) Auger electron spectroscopy.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-184188 , NAS 1.26:184188
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The interaction of atomic oxygen with thin copper films (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A source of thermal, ground-state atomic oxygen has been used to expose thin copper films at a flux of 1.4 x 10 exp 17 atoms/sq cm s for times up to 50 min for each of five temperatures between 140 and 200 C. Rutherford backscattering spectroscopy was used to characterize the oxide formed during exposure. The observations are consistent with the oxide phase Cu2O. The time dependence and the temperature dependence of the oxide layer thickness can be described using oxide film growth theory based on rate limitation by diffusion. Within the time and temperature ranges of this study, the growth of the oxide layers is well described by the equation L(T,t) = 3.6 x 10 to 8th exp(- 1.1/2k sub B T)t exp 1/2, where L,T, and t are measured in angstroms, degrees Kelvin, and minutes, respectively. The deduced activation energy is 1.10 +/- 0.15 eV, with the attendant oxidation rate being greater than that for the corresponding reaction in molecular oxygen.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 96; 2318-232
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Structural modifications in the amino acid lysine induced by soft x-ray irradiation (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8392-8398 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The amino acid DL-lysine has been investigated using the surface-sensitive probe XPS (x-ray photoelectron spectroscopy). The XPS data confirm that solid-state lysine exists in the zwitterionic form. However, during the course of x-ray irradiation in the experiment, the molecule was observed to decompose. A decomposition mechanism consistent with the data has been proposed which involves transformation of the zwitterion to a free base, followed by decarboxylation, to produce 1,5-diaminopentane and CO2 gas. It would appear that caution should be exerted when studying amino acids using XPS if long x-ray irradiation times are employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466786
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The interaction of atomic oxygen with thin copper films (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 2318-2323 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A source of thermal, ground-state atomic oxygen has been used to expose thin copper films at a flux of 1.4×1017 atoms/cm2 s for times up to 50 min for each of five temperatures between 140 and 200 °C. Rutherford backscattering spectroscopy was used to characterize the oxide formed during exposure. The observations are consistent with the oxide phase Cu2O. The time dependence and the temperature dependence of the oxide layer thickness can be described using oxide film growth theory based on rate limitation by diffusion. Within the time and temperature ranges of this study, the growth of the oxide layers is well described by the equation L(T,t)=3.6×108 exp(−1.1/2kBT)t12, where L, T, and t are measured in angstroms, degrees Kelvin, and minutes, respectively. The deduced activation energy is 1.10±0.15 eV, with the attendant oxidation rate being greater than that for the corresponding reaction in molecular oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462028
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Looming crisis in graduate science education: Where are America's top science students? (1994)
    Springer
    Journal of science education and technology 3 (1994), S. 57-63 
    Details
    ISSN: 1573-1839
    Keywords: Graduate education ; sciences ; physics ; recruiting ; employment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract Only 750 physics doctorates were awarded to American students during 1990–1991 from a population base of over 248 million people. Even institutions such as MIT are having difficulty attracting enough top American students to its graduate programs in the sciences. We discuss some of the reasons for the decline in domestic student participation in the sciences and offer several nuts-and-bolts methods to reverse this trend. Key ingredients include graduate student recruiting, motivational activities to promote the excitement of being a professional scientist, and a reeducation of employers to look more favorably toward hiring students from the basic sciences. The methods have resulted in dramatic changes in the composition of recent graduate classes; at Auburn University we now admit an incoming class composed of over 70% domestic students.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575816
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    Paper (German National Licenses)
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