Zum Abwiegen bestimmter Gewichtsmengen von Fett

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Numerical simulation of three-dimensional natural convection inside a heat generating anisotropic porous medium

Natural convection in anisotropic heat generating porous medium enclosed inside a rectangular cavity has been studied. A 3D finite volume based code is developed using the Darcy approximation and validated using experimental results of natural convection around an enclosed rod bundle. Subsequently, detailed simulation is carried out for a cavity, filled with orthotropic porous medium. The effects of heat generation, geometry and anisotropy are studied. Anisotropy is found to be of significant importance for both maximum value and distribution of temperature.     

Determination of energy and mass distributions of ions and neutral particles in magnetron-ionplating

Summary Energy distributions are presented of the ions produced in a magnetron plasma source which hit the negatively biased substrate surface thus getting deeper insight into the coating process. By observing the mass analysed fluxes and the energy distributions of the impinging particles it is found that practically only atomic ions and atomic neutrals arrive at the substrate and contribute to the growth of the film.     

Phenole

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Fermi-edge singularities in the photoluminescence spectrum of modulation-doped GaAs v-groove quantum wires

We report the observation of strong Fermi-edge singularities in the photoluminescence spectrum of strongly-confined, modulation-doped GaAs v-groove quantum wires. The behaviour of the singularity has been investigated at high excitation intensity, and both lattice and electrical heating. The latter produces a strong reduction of the singularity due to Fermi surface smearing, whereas, increased photoexcitation produces complex electron–hole correlation effects.     

La rèaction de parri et les sulfonamides

In der Parri's reaction certain sulphonamidcs give colourations which may lead to confusion with barbiturates. Sulphathiazole gives an intense violet colour; sulpliapyndine and sulphadiazinc give a weak violet colour.In the case of sulphathiazolc the colour is due to its coball(II) salt. In the presence of an excess of ammonia there is formed an insoluble rose-coloured product corresponding to the formula (Sulphathiazole) ₂Co(NH₃).3H₂O.