Richard Sanders

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We present numerical solutions of a two-dimensional Riemann problem for the com-pressible Euler equations that describes the Mach reflection of weak shock waves. High resolution finite volume schemes are used to solve the equations formulated in self-similar variables. We use extreme local grid refinement to resolve the solution in the neighborhood of an(More)
We present numerical solutions of a two-dimensional Riemann problem for the non-linear wave system which is used to describe the Mach reflection of weak shock waves. Robust low order as well as high resolution finite volume schemes are employed to solve this equation formulated in self-similar variables. These, together with extreme local grid refinement,(More)
[1] The Gulf Stream provides a 'nutrient stream,' an advective flux of nutrients carried in sub‐surface waters, redistributing nutrients from the tropics to the mid latitudes. There is a dramatic downstream strengthening in the full depth, volume and nitrate transport diagnosed from synoptic measurements along three sections: 32 Sv and 300 kmol s −1 at(More)
Recent numerical solutions and shock tube experiments have shown the existence of a complex reflection pattern, known as Guderley Mach reflection, which provides a resolution of the von Neumann paradox of weak shock reflection. In this pattern, there is a sequence of tiny supersonic patches, reflected shocks and expansion waves behind the triple point, with(More)
Microbial gardening in the ocean's twilight zone: Detritivorous metazoans benefit from fragmenting, rather than ingesting, sinking detritus Fragmentation of refractory detritus by zooplankton beneath the euphotic zone stimulates the harvestable production of labile and nutritious microbial biomass Sinking organic particles transfer $10 gigatonnes of carbon(More)
Ammonium (NH 4 +) concentration was measured at 15 stations in the NE Atlantic during the declining phase of the spring diatom bloom as part of the FISHES 2001 cruise. The NE Atlantic temperate spring bloom is one of the largest seasonal events in the oceanic cycle of primary productivity and represents the conversion of large amounts of oxidized nitrogen(More)
In 2001 the Teleservice laboratory was established within the Avantel project, a cooperation project between Ericsson, Telenor, the Department of Telematics at NTNU, and SINTEF. Avantel aims at establishing a centre of excellence on rapid development of advanced telecom services. The Teleservice laboratory provides state-of-the-art technology and(More)
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