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  • 1995-1999  (134)
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  • 1
    Digitale Medien
    Digitale Medien
    Coherent structures and turbulent cascades in two-dimensional incompressible magnetohydrodynamic turbulence (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3623-3639 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Numerical solutions of decaying two-dimensional incompressible magnetohydrodynamic turbulence reach a long-lived self-similar state which is described in terms of a turbulent enstrophy cascade. The ratio of kinetic to magnetic enstrophy remains approximately constant, while the ratio of energies decreases steadily. Although the enstrophy is not an inviscid invariant, the rates of enstrophy production, dissipation, and conversion from magnetic to kinetic enstrophy are very evenly balanced, resulting in smooth power law decay. Energy spectra have a k−3/2 dependence at early times, but steepen to k−5/2. Local alignment of the intermediate and small-scale fields grows, but global correlation coefficients do not. The spatial kurtosis of current grows and is always greater than the vorticity kurtosis. Axisymmetric monopole patterns in the current (magnetic vortices) are dominant structures; they typically have a weaker concentric, nonmonotonic vorticity component. Fast reconnection or coalescence events occur on advective and Alfvén time scales between close vortices of like sign. Current sheets created during these coalescence events are local sites of enstrophy production, conversion, and dissipation. The number of vortices decreases until the fluid reaches a magnetic dipole as its nonlinear evolutionary end-state. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871062
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Stability of magnetic vortices with flow in anisotropic magnetohydrodynamics (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3583-3590 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The eigenvalue problem for linear stability of concentric radial profiles of current and vorticity in reduced forms of three-dimensional magnetohydrodynamics is solved numerically. Arbitrary relative amplitudes of the velocity and magnetic fields are considered. Vorticity profiles are unstable if nonmonotonic, but are stabilized by a poloidal magnetic field when the on-axis vertical current is at least as large as the on-axis vertical vorticity. Nonmonotonic current profiles are less efficient at stabilization. When the neutral modes have vertical structure, an added poloidal magnetic field does not stabilize the mode unless the vertical field is also moderately strong. Current profiles in which the integrated current changes sign, although spectrally stable, are shown to be nonlinearly unstable via both numerical solution and Lyapunov techniques. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871949
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Potential Mechanisms of Plastic Adaptive Changes in the Vestibulo-Ocular Reflex (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 781 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb15723.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis of 3-Hydroxy-3-cyclobutene-1,2-dione Based Amino Acids (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 1470-1472 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00110a060
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Synthesis of 24.xi.-Squalamine, an Anti-Infective Steroidal Polyamine (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 5121-5126 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00121a033
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  • 6
    Digitale Medien
    Digitale Medien
    Generalised Geometric Random Variables (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Teaching statistics 17 (1995), S. 0 
    Details
    ISSN: 1467-9639
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Mathematik
    Notizen: Properties of the random variable representing the number of identical and independent Bernoulli trials necessary to obtain K consecutive successes are investigated. The results are interesting to students in a first course in probability or mathematical statistics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1467-9639.1995.tb00705.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Oral deformities in tadpoles (Ranacatesbeiana) associated with coal ash deposition: effects on grazing ability and growth (1996)
    Oxford BSL : Blackwell Science Ltd
    Freshwater biology 36 (1996), S. 0 
    Details
    ISSN: 1365-2427
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: 1. Tadpoles of the bullfrog (Ranacatesbeiana) collected in a coal ash deposition basin (contaminated with As, Cd, Cr, Cu, Se and other elements) and a downstream drainage swamp had a reduced number of labial teeth and deformations of labial papillae when compared with tadpoles from reference areas. Tadpoles from the coal ash-affected areas had 90% fewer teeth in anterior tooth row number 2 and 40% fewer teeth in posterior row number 1 than reference animals. In the deposition basins, drainage swamp and reference ponds, respectively, 96.2, 85.1 and 2.9% of tadpoles had oral deformities.2. Tadpoles with deformities were less able to graze periphyton than were normal tadpoles, when tested in the laboratory. When presented with periphyton as a sole food source, tadpoles with deformed teeth had lower (negative) growth rates than those with normal teeth, which had slightly positive growth rates. When particulate food was also available, tadpoles grew well regardless of deformities.3. It appears that the morphological deformities associated with this coal ash-polluted environment can have ecological ramifications for the affected organisms by limiting the type of food that can be consumed and the ability to grow when multiple food types are unavailable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2427.1996.00123.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Food hygiene information: power to the people? (1998)
    Bingley : Emerald
    Nutrition & food science 98 (1998), S. 138-144 
    Details
    ISSN: 0034-6659
    Quelle: Emerald Fulltext Archive Database 1994-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The issues of microbial food poisoning are never far from the headlines. Of particular concern is the emergence of strains of increased virulence, for example Escherichia coli 0157. As we are likely to be faced with a succession of food hygiene challenges in our kitchens, do consumers have access to the information they need and is it presented in such a way that it encourages and motivates towards good food handling and food hygiene practices? This paper concentrates on a range of food hygiene information provided by the Government, the Health Education Authority and the media. The information is examined with respect to availability, content and context. Observations are made from sociological, scientific and visual communications perspectives.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1108/00346659810208288
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Designer oils for better nutrition (1996)
    [s.l.] : Nature Publishing Company
    Nature biotechnology 14 (1996), S. 946-946 
    Details
    ISSN: 1546-1696
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: [Auszug] The genetic engineering of the fatty acid composition of plants has become a reality. With the right genes and promoters, it is now possible to redesign the fatty acid profile of either plant membranes or plant storage oils. In this issue of Nature Biotechnology, Toguri and colleagues1 (pp ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nbt0896-946
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Radial Variations in Modulus and Hardness in SCS-6 Silicon Carbide Fibers (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The mechanical properties of SCS-6 SiC fibers were measured as a function of fiber radius using nanoindentation techniques. Hardness and Young's modulus were characterized for the material in all of the major regions of these fibers: the carbon core, the graphitic core coating, the inner SiC sheath, and the outer SiC sheath. The carbon core of the fibers was determined to be uniform in properties but extremely compliant. Young's modulus of 28 GPa and a hardness of 4.2 GPa were measured. The graphitic core coating was found to exhibit considerable anelasticity and to have both a low modulus (21 GPa) and a low hardness (1.7 GPa). The inner sheath of the fiber, which contained a varying chemistry, showed a sharp increase in stiffness and hardness from the inner core. Modulus and hardness increased by an order of magnitude over just 1 or 2 μm when transversing radially away from the core into the SiC. This change in properties was pronounced and clearly defined. The outer sheath, which contained a uniform chemistry and microstructure, was consistently stiff and hard when transversing radially. The average modulus and hardness for the full fiber was 333 GPa. The values reported for Young's modulus and hardness clearly showed that the mechanical properties of SCS SiC fibers exhibit dramatic changes across their diameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01730.x
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