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  • 1
    Digitale Medien
    Digitale Medien
    Heterogeneous permanganate oxidations: an improved procedure for the direct conversion of olefins to .alpha.-diketones/.alpha.-hydroxy ketones (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 5182-5184 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00282a042
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  • 2
    Digitale Medien
    Digitale Medien
    Mechanism of interaction of O-amino-D-serine with sheep liver serine hydroxymethyltransferase (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 9607-9612 
    Details
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/bi00451a009
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  • 3
    Digitale Medien
    Digitale Medien
    Mode of interaction of aminooxy compounds with sheep liver serine hydroxymethyltransferase (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 9613-9617 
    Details
    ISSN: 1520-4995
    Quelle: ACS Legacy Archives
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/bi00451a010
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  • 4
    Digitale Medien
    Digitale Medien
    New high-power arbitrary ratio power splitter at microwave frequencies (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1123-1126 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The details of a new, high-power, arbitrary ratio, waveguide power splitter at microwave frequencies are described. The experimental results, giving the coupled powers at the two output ports for different coupling ratios, are presented for input power levels of 1 and 3 kW (cw). The results are compared with the theory for such structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139569
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  • 5
    Digitale Medien
    Digitale Medien
    High power microwave line with arbitrary impedance matching capability for plasma applications (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 244-248 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The details of a high power microwave transmission line developed for plasma applications are presented. The line operates at 2.45 GHz and can handle about (approximately-less-than)1 kW of cw microwave power with about 15%–20% insertion loss. A special feature of the line is its wide range impedance matching capability for operating under different load conditions. A coaxial triple stub tuner capable of handling high power cw microwaves was especially developed for this purpose. Detailed design considerations for the tuner and other critical components like the high power vacuum seal are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1141072
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  • 6
    Digitale Medien
    Digitale Medien
    Decay of spanwise wavy inhomogeneities in a three-dimensional turbulent boundary layer over an “infinite” swept concave wing (1988)
    Springer
    Experiments in fluids 6 (1988), S. 487-492 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Measurements have been made in a three-dimensional turbulent boundary layer over a concave surface, whose generators were swept at 35 ° (simulating an “infinite” swept wing). The results show that the quasi-periodic spanwise variations of skin friction, reported in two-dimensional concave wall turbulent boundary layers, decay in the presence of a cross flow. Skin friction surveys in a companion experiment with an “infinite” swept concave surface of variable sweep show that there exists a critical sweep angle below which the disturbances grow, and above which they decay.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00196510
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  • 7
    Digitale Medien
    Digitale Medien
    Role of crack size in the bi-modal static fatigue failure of a cordierite glass and glass-ceramic (1987)
    Springer
    Journal of materials science 22 (1987), S. 871-876 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A study was conducted of the static fatigue behaviour at room temperature of a cordierite glass and glass-ceramic with model flaws of two different sizes introduced by the indentation fracture method. For the cordierite glass the stress intensity exponent, N, for sub-critical crack growth inferred from the dependence. of time-to-failure on stress was the same for the two different crack sizes and showed good agreement with the value of N for data obtained in an earlier study for dynamic fatigue and by the double-torsion method. For the cordierite glass-ceramic, which consisted of larger crystallites (a few micrometres in size) embedded in a primarily crystalline fine-grained matrix, the static fatigue response depended strongly on crack size, also observed during dynamic fatigue. This effect was attributed to the relative size difference between the cracks and the crystallites. The small cracks could propagate in a planar fashion, whereas the larger cracks were subject to toughening by crack-deflection around the crystallites and a corresponding decrease in the rate of sub-critical crack growth. An analysis for the case of idealized “bi-modal” crack-size dependent sub-critical crack-growth indicated that, for a cordierite glass-ceramic with small cracks, the role of the larger crystallites serves to introduce a “pseudo” fatigue-limit.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01103523
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  • 8
    Digitale Medien
    Digitale Medien
    Effect of test method and crack size on the fracture toughness of a chain-silicate glass-ceramic (1986)
    Springer
    Journal of materials science 21 (1986), S. 2365-2372 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The fracture toughness of a canasite glass-ceramic with a highly acicular, interlocked grain structure was measured by a number of different methods. The values at room temperature obtained by the chevron-notch, short-bar and notched-beam methods ranged from 4 to 5 M Pa m−1/2, well above literature values for other glass-ceramics. Similar values of toughness were obtained by the fracture of bars with indentation cracks introduced with loads ranging from 1.96 to 400 N, but only for crack sizes 〉200 μm, with lower values for cracks of smaller size. The toughness values obtained by the direct measurement of the size of the indentation cracks were appreciably lower than the values obtained by all other methods over the total range of indentation loads and corresponding crack size. SEM fractography showed that the surface within the indentation cracks was appreciably smoother than the surrounding fracture surface. The high values of fracture toughness were attributed to the combined mechanisms of crack-deflection and microcrack-toughening due to the stress-enhanced creation of microcracks caused by the residual stresses which arise from the thermal expansion anisotropy of the canasite monoclonic crystal structure. The strong negative temperature dependence of the fracture toughness suggests that at room temperature microcrack toughening represents the primary contributing mechanism to the fracture toughness. The combined effects of crack-deflection and microcrack-toughening can lead to the development of glass-ceramics with greatly improved resistance to crack propagation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01114280
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  • 9
    Digitale Medien
    Digitale Medien
    On the statistical mechanics of the traveling salesman problem (1986)
    Springer
    Journal of statistical physics 45 (1986), S. 1-25 
    Details
    ISSN: 1572-9613
    Schlagwort(e): spin glass ; N-P complete optimization problems
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We consider the statistical mechanics of the traveling salesman problem (TSP) and develop some representations to study it. In one representation the mean field theory has a simple form and brings out some of the essential features of the problem. It shows that the system has spontaneous symmetry breaking at any nonzero temperature. In general the phase progressively changes as one decreases the temperature. At low temperatures the mean field theory solution is very sensitive to any small perturbations, due to the divergence of some local susceptibilities. This critical region extends down to zero temperature. We perform the quenched average for a nonmetric TSP in the second representation and the resulting problem is more complicated than the infinite-range spin-glass problem, suggesting that the free energy landscape may be more complex. The role played by “frustration” in this problem appears explicitly through the localization property of a random matrix, which resembles the tight binding matrix of an electron in a random lattice.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01033073
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  • 10
    Digitale Medien
    Digitale Medien
    Comparative role of salps and other zooplankton in the cycling and transport of selected elements and natural radionuclides in Mediterranean waters (1985)
    Springer
    Biogeochemistry 1 (1985), S. 353-360 
    Details
    ISSN: 1573-515X
    Schlagwort(e): element and radionuclide cycling ; zooplankton ; gelatinous plankton ; fecal pellets ; vertical flux
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie
    Notizen: Abstract Salps, salp fecal pellets and other zooplankton species were analyzed for a suite of elements and natural radionuclides to assess their role in the biogeochemical cycling of nuclides in oceanic waters. The nuclide/Al ratios in organisms normalized to the same ratio in crustal rock indicated that Ca, Sr, Zn, Cu, U,210Po, and210Pb are enriched in the organisms. The concentrations of Fe, Al, Th isotopes and210Pb in salps and fecal pellets were about an order of magnitude higher than those in salps, whereas Ca, Cu, Zn, Mn and Po were higher by factors of about 2–5. Fluxes via salp defecation were higher than those which have been measured in crustacean zooplankton species, a result primarily due to the high defecation rates characteristic of salps. High nuclide levels in salp fecal pellets coupled with high defecation rates and presumed high salp biomass in many areas underscore the importance of these indiscriminate filter feeders in packaging and transporting to depth particulate-associated nuclides in surface waters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02187377
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