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  • 11
    Digitale Medien
    Digitale Medien
    Elasto-plastic analysis of Reissner-Mindlin plates by the use of hybrid stress FEM with layered model (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 351-359 
    Details
    ISSN: 0894-9166
    Schlagwort(e): Reissner-Mindlin plate ; hybrid stress ; FEM ; layered model
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Based on aπ mR -type variational formulation featuring a cross-depth layered model in conjunction with a mechanical sub-element for simulating the material constitution, the cross-depth plasticity development of the Reissner-Mindlin plate is investigated by following the loading process. A 4-node quadrilateral hybrid-stressc 0-continuous plate-bending element HPT-9β is formulated. Numerical examinations demonstrate its remarkable characteristic behavior in being free from spurious kinematic mode, capable of alleviating “locking” difficulties as the thin plate limit is approached and providing numerical results with remarkable accuracy and computational efficiency over Spilker's counterpart LH4. An elasto-plastic analysis of Reissner-Mindlin plates has justified the validity and effectiveness of the present scheme in depicting the cross-depth plasticity development following the loading process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02206404
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  • 12
    Digitale Medien
    Digitale Medien
    Cytological and Biochemical Alterations in Carassius auratus Hepatocytes from Exposure to Sediment Containing Dioxins and Related Compounds (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 358-363 
    Details
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract. Cytological and biochemical alterations of crucial carp (Carassius auratus) hepatocytes were characterized after exposure to sediments from a lake contaminated with dioxins and other industrial chemicals. Carp were exposed in 20 L water containing 25, 50, or 100 g of contaminated sediment for 2 and 4 weeks. Ultrastructural changes in the liver were characterized by severe enlargement of hepatocytes. Alterations in the cell included formation of condensed and irregular cell nucleus, polynuclei, dispersed heterochromatin, enlargement of the nucleolus, and degeneration of the nucleus. Mitochondrial numbers were reduced and cristae were deformed. Myelin figures and lysosomes were increased, and sometimes cell organelles and cell matrix were totally lost after 4 weeks of exposure. The ultrastructural alterations were correlated with exposure time and sediment concentrations. Hepatosometic index was significantly increased in experimental groups at 2 and 4 weeks as compared with the control group. EROD enzyme activities were strongly induced in liver. A trend from rough endoplasmic reticulum (RER) to SER was observed. Our results suggest that the dioxin-like compounds bound by sediment were bioavailable to C. auratus and cause sublethal effects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002449900525
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  • 13
    Digitale Medien
    Digitale Medien
    Development and molecular cytogenetic analysis of wheat-Haynaldia villosa 6VS/6AL translocation lines specifying resistance to powdery mildew (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1125-1128 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Wheat ; Haynaldia villosa ; Alien translocation ; Powdery mildew resistance ; In situ hybridization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Several Triticum aestivum L.-Haynaldia villosa disomic 6VS/6AL translocation lines with powdery mildew resistance were developed from the hybridization between common wheat cultivar Yangmai 5 and alien substitution line 6V(6A). Mitotic and meiotic C-banding analysis, aneuploid analysis with double ditelosomic stocks, in situ hybridization, as well as the phenotypic assessment of powdery mildew resistance, were used to characterize these lines. The same translocated chromosome, with breakpoints near the centromere, appears to be present in all the lines, despite variation among the lines in their morphology and agronomic characteristics. The resistance gene, conferred by H. villosa and designated as Pm21, is a new and promising source of powdery mildew resistance in wheat breeding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00223930
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  • 14
    Digitale Medien
    Digitale Medien
    Comparative stability of ethanol production by Escherichia coliKO11 in batch and chemostat culture (1999)
    Springer
    Journal of industrial microbiology and biotechnology 23 (1999), S. 701-708 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Keywords: ethanol; recombinant; E. coli KO11; lignocellulosic; chemostat; stability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Differing claims regarding the stability of the recombinant ethanologen E. coli KO11 are addressed here in batch and chemostat culture. In repeat batch culture, the organism was stable on glucose, mannose, xylose and galactose for at least three serial transfers, even in the absence of a selective antibiotic. Chemostat cultures on glucose were remarkably stable, but on mannose, xylose and a xylose/glucose mixture, they progressively lost their hyperethanologenicity. On xylose, the loss was irreversible, indicating genetic instability. The loss of hyperethanologenicity was accompanied by the production of high concentrations of acetic acid and by increasing biomass yields, suggesting that the higher ATP yield associated with acetate production may foster the growth of acetate-producing revertant strains. Plate counts on high chloramphenicol-containing medium, whether directly, or following preliminary growth on non-selective medium, were not a reliable indicator of high ethanologenicity during chemostat culture. In batch culture, the organism appeared to retain its promise for ethanol production from lignocellulosics and concerns that antibiotics may need to be included in all media appear unfounded.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/sj.jim.2900690
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  • 15
    Digitale Medien
    Digitale Medien
    Decomposition of Cyclohexyl-t-butyl-Dimethylammonium Tetraphenylborate: Synthesis and kinetics (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 487-493 
    Details
    ISSN: 1572-8943
    Schlagwort(e): non-isothermal kinetics ; quaternary ammonium ; tetraphenylborate ; thermal decomposition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A new compound cyclohexyl-t-butyldimethylammonium tetraphenylborate, [C6H11N(CH3)2(C(CH3)3)]BPh4 has been prepared, and its decomposition mechanism was studied by TG. The IR spectra of the products of thermal decomposition were examined at every stage. Kinetic analysis for the first stage of thermal decomposition process was obtained by TG and DTG curves, and kinetic parameters were obtained from the analysis of the TG-DTG curves with integral and differential equations. The most probable kinetic function was suggested by comparison of kinetic parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010184028318
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  • 16
    Digitale Medien
    Digitale Medien
    Precision submillimeter wave laser reflection measurements of high-temperature superconductors (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 389-393 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Submillimeter wave ; laser ; reflection ; surface resistance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract Submillimeter wave laser reflection measurements of surface resistance can provide improved capability in the combination of sensitivity, spatial resolution, and frequency range. We have made reflectivity measurements on metals at 1630 GHz with an uncertainty of less than 0.3%. This sensitivity corresponds to a measurement sensitivity for surface resistance of 0.3 Ω. Assuming anf 2 frequency scaling of high-temperature superconductor surface resistance from the microwave to the terahertz frequency range, this sensitivity corresponds to about 1 ×10−5 Ω at 10 GHz. Capability for 10−7 Ω sensitivity could eventually be possible. Preliminary submillimeter wave reflection measurements of a YBCO thin film have been made with a sensitivity of 1%. Submillimeter wave reflectometry can make it possible to determine the spatial dependence of surface resistance in a wide range of material sizes and shapes. The spatial resolution could be on the order of 0.3–0.5 mm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00618139
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  • 17
    Digitale Medien
    Digitale Medien
    Description of isovector giant dipole resonances in relativistic Vlasov equation at small amplitude limit (1995)
    Springer
    The European physical journal 352 (1995), S. 119-126 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.−k ; 24.30.Cz ; 24.10Jv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A more general relativistic Vlasov equation has been derived in the framework of relativistic quantum hadron dynamical theory. In the small amplitude limit we use this Vlasov equation to study the isovector giant dipole resonances built on groundstate in spherical nuclei16O,40Ca,90Zn and208Pb. The results show that the spin-orbit coupling and the non-linear terms of scalar meson can influence the resonance energies to a certain extent comparing with those obtained from the non-relativistic Vlasov equation approach and are in good agreement with the experimental ones, especially for the case which vacuum fluctuation is included.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01298896
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  • 18
    Digitale Medien
    Digitale Medien
    A Contactless CCD Dilatometer for Foil Materials (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 743-753 
    Details
    ISSN: 1572-9567
    Schlagwort(e): CCD ; contactless ; dilatometer ; foil ; thermal expansion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A contactless, compact, low-cost dilatometer based on a laser-pulse thermal-conductivity apparatus has been developed to measure the linear thermal expansion of foil materials. The two sample-edge images are projected onto the array of a charge-coupled device (CCD). Changes in sample length are determined from measurements of the corresponding displacements of the sample-edge images focused on the CCD. The dilalometer performance was tested by comparing results of measurements of the thermal expansion for pure copper with published data. The linear thermal expansion of an L-16-type foil of 20-μm thickness, which is a candidate material for thermocontrol layers (in engineering), was measured with the apparatus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022685927689
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  • 19
    Digitale Medien
    Digitale Medien
    On the loss factor of wood during radio frequency heating (1999)
    Springer
    Wood science and technology 33 (1999), S. 299-310 
    Details
    ISSN: 0043-7719
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Abstract  The radial direction loss factor of full-size western hemlock sapwood and heartwood, as well as western red cedar heartwood timbers was measured using the direct calorimetric method with a laboratory-scale radio frequency/vacuum dryer at the frequency of 13.56 MHz, moisture content range between 10 and 80%, temperature range between 25 and 55 °C, and root mean square (rms) electrode voltages of 0.8 and 1.1 kV, respectively. The results indicated that the moisture content, temperature, electric field strength and wood type significantly affected the loss factor. Empirical regression equations were derived based on the experimental data that made possible the calculation of the loss factor and power density within wood during RF heating.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002260050117
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  • 20
    Digitale Medien
    Digitale Medien
    Microstructural refinement in Al–Mg2Si in situ composites (1999)
    Springer
    Journal of materials science 18 (1999), S. 783-784 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006684916145
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