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A.W-H. Mau 《Optics Communications》1974,11(4):356-359
A double compartment dye cell to hold two or more dyes has been found to increase the frequency range of dye lasers. Results are compared with those obtained by mixing the same two dyes in a single cell. The dye cells are transversely pumped by a nitrogen laser. Broadband tunability results from dyes having similar absorption ranges but different Stokes shifts. 相似文献
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This department aims to provide problems of interest to people engaged in the study of mathematics and science. All readers are invited to both propose and solve problems. In submitting solutions and proposals the following guidelines should be observed. 相似文献
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Bob Hoogenboom 《Arkiv f?r Matematik》1982,20(1-2):69-85
Proofs are given of two theorems of Berezin and Karpelevi?, which as far as we know never have been proved correctly. By using eigenfunctions of the Laplace-Beltrami operator it is shown that the spherical functions on a complex Grassmann manifold are given by a determinant of certain hypergeometric functions. By application of this result, it is proved that a certain system of operators, fow which explicit expressions are given, generates the algebra of radial parts of invariant differential operators. 相似文献
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In a number of fcc materials such as copper or aluminum, as well as more complex materials such as twinning induced plasticity (TWIP) steels, the interaction between dislocations and other defects such as stacking faults or twins plays an important role in the hardening behavior of such materials. Interactions of dislocation and twin or stacking fault layers have been studied in this work using molecular dynamics. Depending on the material and the loading conditions, possible interaction modes include (i) penetration of the dislocation into the faulted layer, (ii) reduction of the faulted layer after interaction, (iii) growth of the faulted layer after interaction. Such studies up to this point have been performed without temperature control near zero K (0 to 2 K). In this work, we extend the previous studies to higher temperature with the help of two methods, both based on molecular dynamics (MD) modeling. (© 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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This paper treats the computational modeling of size dependence in microstructure models of metals. Different gradient crystal plasticity strategies are analyzed and compared. For the numerical implementation, a dual-mixed finite element formulation which is suitable for parallelization is suggested. The paper ends with a representative numerical example for polycrystals. 相似文献