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  • 2000  (52)
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  • 2000-2004  (52)
  • 1980-1984
  • 1970-1974
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3588-3593 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A set of coupled nonlinear differential equations which govern the dynamics of low-frequency short-wavelength electromagnetic waves in a nonuniform magnetized electron–positron (pair) plasma with dust has been derived. In the linear limit, a local dispersion relation has been derived and analyzed. It is shown that in the absence of density gradients and equilibrium sheared plasma flow, can make the dust shear Alfvén waves unstable. In the nonlinear case, the temporal behavior of nonlinear dissipative system can be expressed in the form of well known Lorenz and Stenflo type equations that admit chaotic trajectories. On the other hand, a quasi-stationary solution of the mode coupling equations can be represented in the form of dipolar and vortex-chain solutions. The results of our present investigation should be helpful for understanding plasma transport and wave phenomena in the pulsars magnetosphere. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 41 (2000), S. 3892-3942 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Quantum groups emerged in the latter quarter of the 20th century as, on the one hand, a deep and natural generalization of symmetry groups for certain integrable systems, and on the other as part of a generalization of geometry itself powerful enough to make sense in the quantum domain. Just as the last century saw the birth of classical geometry, so the present century sees at its end the birth of this quantum or noncommutative geometry, both as an elegant mathematical reality and in the form of the first theoretical predictions for Planck-scale physics via ongoing astronomical measurements. Noncommutativity of space–time, in particular, amounts to a postulated new force or physical effect called cogravity. © 2000 American Institute of Physics.
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  • 3
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Environmental management and health 11 (2000), S. 175-191 
    ISSN: 0956-6163
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Medicine , Economics
    Notes: Freshly prepared, unstained peripheral blood smears from 46 of 50 patients with chronic environmental illness showed clear microscopic evidence of advanced oxidative injury to all elements of circulating blood. As observed with high-resolution (15,000×) phase-contrast and darkfield microscopy, morphologic patterns of oxidative injury to blood components have been designated oxidative coagulopathy, a state of circulating blood comprising: structural abnormalities involving erythrocytes and granulocytes and zones of congealed plasma in its early stages; fibrin clots and thread formation with platelet entrapment in the intermediate stages; and microclot and microplaque formation in late stages. Moderate to advanced changes of oxidative coagulopathy were seen in only two of 15 healthy control subjects. Oxidative coagulopathy begins with oxidative activation of plasma enzymes and leads to oxidative permutations of plasma lipids, proteins, and sugars, and is not merely confined to oxidative activation of recognized coagulation pathways. It is proposed that oxidative coagulopathy represents one of the core pathogenetic mechanisms of homeostatic dysregulation seen in environmental illness and leads to oxidative injury to intracellular matrix, cell membranes, and intracellular organelles such as mitochondria. The observed cellular and plasma changes shed considerable light on many aspects of the macroecologic toxicants and their cellular targets, as well as the microecologic oxidants and their molecular targets. Oxidative coagulopathy is a powerful explanation of the production of symptom-complexes characteristically encountered in environmental illness.
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature America Inc.
    Nature genetics 24 (2000), S. 23-25 
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The mouse is a prime organism of choice for modelling human disease. Over 450 inbred strains of mice have been described, providing a wealth of different genotypes and phenotypes for genetic and other studies. As new strains are generated and others become extinct, it is useful to review ...
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 233-234 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the title compound, 3β-(dimethylamino)-16α-hydroxy-14-methyl-4-methylene-9,19-cyclo-5α-pregnan-20-one monohydrate, C25H39NO2·H2O, the pentacyclo steroidal alkaloid is composed of three six-membered, one five-membered and one three-membered ring. The molecular dimensions are as expected. The structure is stabilized by hydrogen bonds involving H and O atoms of water and the alkaloid molecules, with strong N...O [2.829 (7) Å] and O...O [2.790 (6) and 2.949 (7) Å] interactions.
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  • 6
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Journal of quality in maintenance engineering 6 (2000), S. 287-295 
    ISSN: 1355-2511
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology , Economics
    Notes: This paper reports on the reliability data analysis and modelling of offshore oil platform plant. We first analysed the effectiveness of preventive maintenance to the plant concerned, and then identified the key sub-units and major preventive maintenance activities to be modelled. A modelling technique called the delay time is then used to determine the optimal periodic inspection intervals. The analysis showed that preventive maintenance is generally effective, but a slight decrease of the periodic inspection intervals is favourable.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e501-e502 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title copper complex, [Cu(DL-DAP)2(H2O)2]·2H2O or [Cu(C3H7N2O2)2(H2O)2]·2H2O, prepared from the non-protein amino acid DL-2,3-diaminopropionic acid (DL-HDAP), has a center of symmetry and a distorted octahedral coordination, with four N atoms in equatorial positions and two water molecules in apical sites. The water molecule of crystallization is hydrogen bonded to the deprotonated carboxylate group of the ligand.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Design automation for embedded systems 5 (2000), S. 329-338 
    ISSN: 1572-8080
    Keywords: Reconfigurable computing ; floorplanning ; simulated annealing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The advances in the programmable hardware has lead to new architectures where the hardware can be dynamically adapted to the application to gain better performance. There are still many challenging problems to be solved before any practical general-purpose reconfigurable system is built. One fundamental problem is the placement of the modules on the reconfigurable functional unit (RFU). In reconfigurable systems, we are interested both in online placement, where arrival time of tasks is determined at runtime and is not known a priori, and offline in which the schedule is known at compile time. In the case of offline placement, we are willing to spend more time during compile time to find a compact floorplan for the RFU modules and utilize the RFU area more efficiently. In this paper we present offline placement algorithms based on simulated annealing and greedy methods and show the superiority of their placements over the ones generated by an online algorithm.
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  • 9
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Kinetic studies of ligand substitutions of the six-coordinated RuII pseudo-macrocyclic complex [Ru(CHDH)2- (PPh3)2] (CHDH = cyclohexanedione-dioximato) have been spectrophotometrically investigated in a variety of solvents and at 70, 80, 85 and 90°C. The reactions studied are of the form: [(PPh3)Ru(CHDH)2(PPh3)] + L  = [(PPh3)Ru(CHDH)2L] + PPH3 where L is imidazole, pyridine, piperidine or thiophene or a solvent molecule (PhCl, PhMe, MeCN, DMSO or DMF). The solvolysis reactions with chlorobenzene and toluene proceed to an equilibrium position favoring the bis-triphenylphosphine complex. All other reactions proceed to completion. From a mechanistic point of view the reactions were found to proceed through the formation of a five coordinate intermediate that possesses little or no discriminating ability towards the incoming nucleophiles. The rate data were thus interpreted in terms of a dissociative (D) or dissociative interchange (Id) mechanism. Activation parameters ΔH
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  • 10
    ISSN: 1434-4475
    Keywords: Keywords. N-Methyl piperidinium chlorochromate; Oxidation; Benzylic alcohols; Carbonyl compounds.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  N-Methyl piperidinium chlorochromate adsorbed on alumina oxidizes a wide variety of benzylic alcohols to the corresponding carbonyl compounds.
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