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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 117 (1996), S. 129-143 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary We consider a circular cylindrical membrane subjected to longitudinal extension and twist. The associated equilibrium deformation is considered to be axisymmetric and the analysis is based on a direct two-dimensional formulation. Wrinkling of the membrane is taken into account in an approximate way by introducing arelaxed strain energy function derived from the neo-Hookean strain energy for isotropic elastic solids. Analytical formulae for wrinkled parts of the membrane are used to corroborate the results of a numerical treatment of the full boundary value problem.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4403-4405 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft magnetic composite materials produced by powder metallurgy techniques can be very useful for construction of low cost small motors. However, the rotational core losses and the corresponding B–H relationships of soft magnetic composite materials with two-dimensional rotating fluxes have neither been supplied by the manufacturers nor reported in the literature. This article reports the core loss measurement of a soft magnetic composite material, SOMALOY™ 500, Höganäs AB, Sweden, under two-dimensional excitations. The principle of measurement, testing system, and power loss calculation are presented. The results are analyzed and discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-0972
    Keywords: Extracellular l-glutamate oxidase ; inoculum type ; medium components ; metabolism regulation ; Streptomyces sp. ; submerged fermentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract In submerged fermentation of Streptomyces sp. N1 in a shake flask, glucose (3% w/v) and (NH4)2SO4 (0.6% w/v) were found to be suitable for extracellular l-glutamate oxidase (GluOx) (EC.1.4.3.11) production. GluOx production was higher with the addition of further KCl or MgCl2 to the medium within the range of 0 to 0.12% (w/v). The effect of inoculum type, that is, spore inoculation or mycelium inoculation on GluOx biosynthesis was also investigated, and the maximum GluOx production obtained was 2.7 U/ml after 33h fermentation with mycelium inoculation. The results demonstrated a much higher GluOx production and productivity compared with those reported previously.
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  • 4
    ISSN: 1573-0972
    Keywords: Bioprocess development ; bioreactor optimization ; environmental factors ; modelling ; monitoring ; control ; plant cell culture ; secondary-metabolite production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Two key issues in the application of plant-cell-culture technology to the production of valuable secondary metabolites are reviewed: the selection of cell lines with suitable genetic, biochemical and physiological characteristics; and the optimization of bioreactor environments. Although great progress has been made in recent years in the design, selection and optimization of bioreactor hardware, optimization of environmental factors such as medium components, light irradiation and O2 supply needs detailed investigations for each case. With a better understanding of plant cell metabolism and physiology, further developments in cultivation processes, such as process integration and on-line monitoring and control, can be expected in the near future.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The effect of calcium ions on production of extracellular L-glutamate oxidase (GluOx) in liquid fermentation of Streptomyces sp. N1 was investigated. By supplementing a relatively large amount of Ca2+ (15–40 mM) to the medium, the GluOx production was significantly enhanced, although the microbial growth was inhibited to some degree. For the first time, the highest production (i.e. 6.5 U/ml) and productivity (i.e. 0.25 U/ml/h) of GluOx as ever reported (i.e., 1.2 U/g medium after 144 h solid state fermentation and 0.59 U/ml after 96 h liquid fermentation) were achieved with addition of 30 mM Ca2+.
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  • 6
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract As the dry weight to fresh weight ratio of Panax notoginseng cells is related to the medium sugar concentration, the osmotic pressure can be increased by adding glucose to change cells' water content. When the apparent viscosity was decreased from 80.1 to 10 cp the surface O transfer coefficient (K a) increased from 4.80 to 5.68 h by adding 1.23 g glucose to 50 ml culture medium after 24 h.
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  • 7
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The efficiency of O transfer by a novel centrifugal impeller was higher than that of a conventional flat-bladed turbine impeller at an agitation speed lower than 300 rpm. In addition, at the same agitation speed (200 and 300 rpm), the centrifugal impeller possessed smaller shear stress than the flat-bladed turbine impeller as evaluated by the changes in size distribution of granulated agar particles which were sheared with those two types of impeller.
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  • 8
    ISSN: 1572-9605
    Keywords: d-Wave Paring ; Strongly Correlated Electron-Phonon Systems ; Berry Phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We use path integral and exact diagonalization techniques to study the tunneling of dopant-induced hole polarons which are self-localized by electron-phonon coupling in a two-dimensional anti-ferromagnet. Their low-energy dynamics is found to be dominated by 2nd and 3rd neighbor hopping processes which carry a (−1) Berry phase factor and lead to non-s-wave hole pairing symmetries, including possiblenodeless $$d_{x^2 - y^2 } $$ pair wavefunctions. The polarons obey effective spin-1/2-fermion quasi-particle statistics. The nodeless $$d_{x^2 - y^2 } $$ -wave pairing state can exhibit a transition from gapless to fully gapped behavior in its quasi-particle excitation spectrum, without change of pairing symmetry.
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