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  • 2010-2014  (4)
  • 1990-1994  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Primary and secondary bifurcation in baroclinic instability (1994)
    Springer
    Mineralium deposita 29 (1994), S. 286-290 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In modelling atmospheric flows the baroclinic instability of the flow in a differentially heated rotating annulus plays a central role. This paper deals with an experimental study using LDV and flow visualization techniques. Usually the temperature difference,ΔT, was kept fixed while the angular velocity,ω, was varied. On crossing the stability boundary, the primary bifurcation, the basic flow gives way to a baroclinic wave flow. For a given annulus geometry the wave number,m, of the first wave pattern was found to be uniquely defined byΔT. The measured critical values ofω,ω crit, agree reasonably well with those obtained by other authors. On increasingω aboveω crit the wave number changed, this process showing hysteresis. The situation might indicate secondary bifurcation phenomena. Flow visualization using aluminium particles shows surface flow details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01816692
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    Paper (German National Licenses)
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  • 2
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    First test of Lorentz invariance in the weak decay of polarized nuclei (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-10-16
    Description: Author(s): S. E. Müller, E. A. Dijck, H. Bekker, J. E. van den Berg, O. Böll, S. Hoekstra, K. Jungmann, C. Meinema, J. P. Noordmans, M. Nuñez Portela, C. J. G. Onderwater, C. Pijpker, A. P. P. van der Poel, B. Santra, A. Sytema, R. G. E. Timmermans, O. O. Versolato, L. Willmann, H. W. Wilschut, and K. Yai A new test of Lorentz invariance in the weak interactions has been made by searching for variations in the decay rate of spin-polarized 20 Na nuclei. This test is unique to Gamow-Teller transitions, as was shown in the framework of a recently developed theory that assumes a Lorentz symmetry breaking ... [Phys. Rev. D 88, 071901] Published Tue Oct 15, 2013
    Keywords: Field theory, general methods
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Postglacial adjustment of steep, low-order drainage basins, Canadian Rocky Mountains (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2013-11-21
    Description: [1]  It is generally argued that the legacy of Pleistocene glaciation results in increased sediment flux in mountain systems. An important, but not well-constrained, aspect of Pleistocene glacial erosion is the geomorphic decoupling of cirque basins from main river systems. This study provides a quantitative link between glacier-induced basin morphology, postglacial erosion and sediment delivery for mountain headwaters (with basin area 〈10 km 2 ). We analyze the morphology of 57 headwater basins in the Canadian Rockies, and establish postglacial sediment budgets for select basins. Notable differences in headwater morphology suggest different degrees of erosion by cirque glaciers, which we classify into headwater basins with either cirque or non-cirque morphology. Despite steeper slope gradients in cirque basins, higher mean postglacial erosion rates in basins with non-cirque morphology (0.43-0.6 mm a -1 ) compared to those in cirques (0.19-0.39 mm a -1 ) suggest a more complex relationship between hillslope erosion and slope gradient in calcareous mountain environments than implied by the threshold hillslope concept. Higher values of channel profile concavity and lower channel gradients in cirques imply lower transport capacities and, thus, lower sediment delivery ratios (SDR). These results are supported by i) postglacial SDR values for cirques of 〈15 % with SDRs for non-cirque basins of 〉28 %; and ii) larger fan sizes at outlets of non-cirque basins (~15 % of basin area) compared to cirques (~5 %). Although small headwater basins represent the steepest part of mountain environments and erode significant postglacial sediment, the majority of sediment remains in storage under interglacial climatic conditions and does not affect large-scale mountain river systems.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 4
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    Menaquinone Analogs Inhibit Growth of Bacterial Pathogens [Experimental Therapeutics] (2013)
    The American Society for Microbiology (ASM)
    Details
    Publication Date: 2013-10-12
    Description: Gram-positive bacteria cause serious human illnesses through combinations of cell surface and secreted virulence factors. We initiated studies with four of these organisms to develop novel topical antibacterial agents that interfere with growth and exotoxin production, focusing on menaquinone analogs. Menadione, 1,4-naphthoquinone, and coenzymes Q1 to Q3 but not menaquinone, phylloquinone, or coenzyme Q10 inhibited the growth and to a greater extent exotoxin production of Staphylococcus aureus , Bacillus anthracis , Streptococcus pyogenes , and Streptococcus agalactiae at concentrations of 10 to 200 μg/ml. Coenzyme Q1 reduced the ability of S. aureus to cause toxic shock syndrome in a rabbit model, inhibited the growth of four Gram-negative bacteria, and synergized with another antimicrobial agent, glycerol monolaurate, to inhibit S. aureus growth. The staphylococcal two-component system SrrA/B was shown to be an antibacterial target of coenzyme Q1. We hypothesize that menaquinone analogs both induce toxic reactive oxygen species and affect bacterial plasma membranes and biosynthetic machinery to interfere with two-component systems, respiration, and macromolecular synthesis. These compounds represent a novel class of potential topical therapeutic agents.
    Print ISSN: 0066-4804
    Electronic ISSN: 1098-6596
    Topics: Biology , Medicine
    Published by The American Society for Microbiology (ASM)
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  • 5
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    Many-Body Localization in Dipolar Systems (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-12-12
    Description: Author(s): N. Y. Yao, C. R. Laumann, S. Gopalakrishnan, M. Knap, M. Müller, E. A. Demler, and M. D. Lukin Systems of strongly interacting dipoles offer an attractive platform to study many-body localized phases, owing to their long coherence times and strong interactions. We explore conditions under which such localized phases persist in the presence of power-law interactions and supplement our analytic... [Phys. Rev. Lett. 113, 243002] Published Thu Dec 11, 2014
    Keywords: Atomic, Molecular, and Optical Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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