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The molar absorptivities of the lanthanide complexes with chlorophosphonazo III over the pH range 1-4 were found to increase with atomic number to maximum values near 7000 1.mole(-1).mm(-1) for holmium, erbium and thulium and then to decrease slightly for ytterbium and lutetium. The complexes were found to be stable for up to 65 hr. The addition of alkali metal salts depressed the apparent absorptivity of the complexes but no interference was observed for the phosphate ion. 相似文献
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Using the approach of Rulla (1996 SIAM J. Numer. Anal. 33, 68-87)for analysing the time discretization error and assuming moreregularity on the initial data, we improve on the error boundderived by Barrett and Blowey (1996 IMA J. Numer. Anal. 16,257-287) for a fully practical piecewise linear finite elementapproximation with a backward Euler time discretization of amodel for phase separation of a multi-component alloy. 相似文献
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We consider a model for phase separation of a multi-componentalloy with a concentration-dependent mobility matrix and logarithmicfree energy. In particular we prove that there exists a uniquesolution for sufficiently smooth initial data. Further, we provean error bound for a fully practical piecewise linear finiteelement approximation in one and two space dimensions. Finallynumerical experiments with three components in one space dimensionare presented. 相似文献
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