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Search Results: 1 - 10 of 298308 matches for " J. Price "
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Metrics of hurricane-ocean interaction: vertically-integrated or vertically-averaged ocean temperature?
J. F. Price
Ocean Science Discussions (OSD) , 2009,
Abstract: The ocean thermal field is often represented in hurricane-ocean interaction by a metric termed the upper Ocean Heat Content (OHC), the vertical integral of ocean temperature in excess of 26°C. High values of OHC have proven useful for identifying ocean regions that are especially favorable for hurricane intensification. Nevertheless, it is argued here that a more direct and robust metric of the ocean thermal field may be afforded by a vertical average of temperature, in one version from the surface to 100 m, a typical depth of vertical mixing by a mature hurricane. OHC and the depth-averaged temperature, dubbed T100, are well correlated over the deep open ocean in the high range of OHC, OHC≥75 kJ cm 2. They are poorly correlated in the low range of OHC, ≤50 kJ cm 2, in part because OHC is degenerate when evaluated on cool ocean temperatures ≤26°C. OHC and T100 can be qualitatively different also over shallow continental shelves: OHC will generally indicate comparatively low values regardless of the ocean temperature, while T100 will take on high values over a shelf that is warm and upwelling neutral or negative, since there will be little cool water that could be mixed into the surface layer. Some limited evidence is that continental shelves may be regions of comparatively small sea surface cooling during a hurricane passage, but more research is clearly required on this important issue.
Metrics of hurricane-ocean interaction: vertically-integrated or vertically-averaged ocean temperature?
J. F. Price
Ocean Science (OS) & Discussions (OSD) , 2009,
Abstract: The ocean thermal field is often represented in hurricane-ocean interaction by a metric termed upper Ocean Heat Content (OHC), the vertical integral of ocean temperature in excess of 26°C. High values of OHC have proven useful for identifying ocean regions that are especially favorable for hurricane intensification. Nevertheless, it is argued here that a more direct and robust metric of the ocean thermal field may be afforded by a vertical average of temperature. In the simplest version, dubbed T100, the averaging is from the surface to 100 m, a typical depth of vertical mixing by a category 3 hurricane. OHC and T100 are well correlated over the deep open ocean in the high range of OHC, ≥75 kJ cm 2. They are poorly correlated in the low range of OHC, ≤50 kJ cm 2, in part because OHC is degenerate when evaluated on cool ocean regions, ≤26°C. OHC and T100 can be qualitatively different also over shallow continental shelves: OHC will generally indicate comparatively low values regardless of the ocean temperature, while T100 will take on high values over a shelf that is warm and upwelling neutral or negative. In so far as the ocean thermal field alone is concerned, these warm, shallow continental shelves would appear to be as favorable for hurricane intensification as are warm, deep ocean regions.
O. Boersma, Vluchtig voorbeeld. De Nederlandse, Franse en Italiaanse vluchtelingenkerken in Londen, 1568-1585
J.L. Price
BMGN : Low Countries Historical Review , 1995,
Abstract:
The dangers of unscientific history. Schama and the Dutch seventeenth-century
J.L. Price
BMGN : Low Countries Historical Review , 1989,
Abstract: S. Schama, The embarrassment of riches. An interpretation of Dutch culture in the Golden Age
D.P. Blok, W. Prevenier, D.J. Roorda, Algemene Geschiedenis der Nederlanden, VIII, Nieuwe tijd. Sociaal economische geschiedenis 1650-1800; Politieke geschiedenis 1648-1700; Religiegeschiedenis tweede helft 17de eeuw
J.L. Price
BMGN : Low Countries Historical Review , 1981,
Abstract:
D. Regin, Traders, artists, burghers. A cultural history of Amsterdam in the 17th century
J.L. Price
BMGN : Low Countries Historical Review , 1978,
Abstract:
W.Th.M. Frijhoff, Wegen van Evert Willemsz. Een Hollands weeskind op zoek naar zichzelf 1607-1647
J.L. Price
BMGN : Low Countries Historical Review , 1997,
Abstract:
Smoothed Particle Hydrodynamics: Things I wish my mother taught me
Daniel J. Price
Physics , 2011,
Abstract: I discuss the key features of Smoothed Particle Hydrodynamics (SPH) as a numerical method - in particular the key differences between SPH and more standard grid based approaches - that are important to the practitioner. These include the exact treatment of advection, the absence of intrinsic dissipation, exact conservation and more subtle properties that arise from its Hamiltonian formulation such as the existence of a minimum energy state for the particles. The implications of each of these are discussed, showing how they can be both advantages and disadvantages.
Resolving high Reynolds numbers in SPH simulations of subsonic turbulence
Daniel J. Price
Physics , 2011, DOI: 10.1111/j.1745-3933.2011.01187.x
Abstract: Accounting for the Reynolds number is critical in numerical simulations of turbulence, particularly for subsonic flow. For Smoothed Particle Hydrodynamics (SPH) with constant artificial viscosity coefficient alpha, it is shown that the effective Reynolds number in the absence of explicit physical viscosity terms scales linearly with the Mach number - compared to mesh schemes, where the effective Reynolds number is largely independent of the flow velocity. As a result, SPH simulations with alpha=1 will have low Reynolds numbers in the subsonic regime compared to mesh codes, which may be insufficient to resolve turbulent flow. This explains the failure of Bauer and Springel (2011, arXiv:1109.4413v1) to find agreement between the moving-mesh code AREPO and the GADGET SPH code on simulations of driven, subsonic (v ~ 0.3 c_s) turbulence appropriate to the intergalactic/intracluster medium, where it was alleged that SPH is somehow fundamentally incapable of producing a Kolmogorov-like turbulent cascade. We show that turbulent flow with a Kolmogorov spectrum can be easily recovered by employing standard methods for reducing alpha away from shocks.
Exclusive Photoproduction of the Cascade (Xi) Hyperons
J. W. Price
Physics , 2004, DOI: 10.1103/PhysRevC.71.058201
Abstract: We report on the first measurement of exclusive Xi-(1321) hyperon photoproduction in gamma p --> K+ K+ Xi- for 3.2 < E(gamma) < 3.9 GeV. The final state is identified by the missing mass in p(gamma,K+ K+)X measured with the CLAS detector at Jefferson Laboratory. We have detected a significant number of the ground-state Xi-(1321)1/2+, and have estimated the total cross section for its production. We have also observed the first excited state Xi-(1530)3/2+. Photoproduction provides a copious source of Xi's. We discuss the possibilities of a search for the recently proposed Xi5-- and Xi5+ pentaquarks.
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