Zur Bestimmung von Xanthogenaten und di?thyldithiocarbamidsaurem Natrium durch Extraktion

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Zur Bestimmung von Rotenon in pharmazeutischen Pr?paraten

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Zur Bestimmung von Kohlendioxyd in Weinen

Ohne Zusammenfassung     

Long-term acid resistance and selectivity of NF membranes in very acidic conditions

The aim of the study was to test commercial and experimental NF membranes for their separation efficiency and acid resistance in a long-term filtration experiment. Several NF membranes (NF 270, Desal-5 DK, Desal KH, BPT-NF-1 and BPT-NF-2) were tested for their separation efficiency and stability when a solution containing 25 g/L CuSO₄ and 8 wt.% H₂SO₄ was continuously filtered at 40 °C for 2 months. Filtration experiments were carried out with a new five-cell flat-sheet laboratory apparatus. Commercial NF membranes showed good selectivity, retaining most of the copper sulphate and letting most of the sulphuric acid pass into the permeate. However, only the membranes designed to be acid resistant (Desal KH and BPT-NF-2) maintained their separation efficiency during the 2 months of separation. The Desal KH membrane gave better copper retention values (92–95%) than the BPT-NF-2 (60–88%), but the overall selectivity was best with the BPT-NF-2 membrane due to its good sulphuric acid permeation.     

On Accurate Linear Approximations for Chance-Constrained Programming

This paper introduces the CHAPS (chance-constrained programming system) algorithm, which uses linearization techniques but gives more accurate solutions than earlier, similar methods.     

Measurement of biomagnetic fields using multichannel superconducting-magnetometer techniques

Summary We have constructed a three-channel differential SQUID magnetometer for the simultaneous measurement of the three orthogonal components of the magnetic field in the same location. The structure of the device is described and MCG data measured are shown. Interference effects between the channels are discussed. A preliminary report of this work has been presented     

Photometrische Diacetylbestimmung mit o-Phenylendiamin

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Bestimmung von Salz in K?se

Ohne Zusammenfassung