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Semiconductors - The optical properties of dielectric nanostructures strongly depend on dielectric nanoparticles (NP) polarizability which can take the high values even interacting with... 相似文献
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Yu. D. Litinskii M. I. Dzyuba L. E. Sheludker Yu. S. Shmelev 《Metal Science and Heat Treatment》1976,18(5):435-438
1. | We investigated the conditions for the development of segregation in centrifugally cast austenitic stainless steels. |
2. | The composition of the excess phase in steel 0Kh10N20T2 was established. |
3. | In castings with a two-zone macrostructure the development of segregation and the formation of excess phase in the inner surface lower the plasticity and increase the possibility of defects in hot rolling. |
4. | Centrifugally cast stainless steels should have a one-zone macrostructure of columnar crystals. |
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Influence of structural variation in room-temperature ionic liquids on the selectivity and efficiency of competitive alkali metal salt extraction by a crown ether 总被引:13,自引:0,他引:13
An improved method for the preparation of 1-alkyl-3-methylimidazolium hexafluorophosphates provides a series of room-temperature ionic liquids (RTILs) in which the 1-alkyl group is varied systematically from butyl to nonyl. For competitive solvent extraction of aqueous solutions of alkali metal chlorides with solutions of dicyclohexano-18-crown-6 (DC18C6) in these RTILs, the extraction efficiency generally diminished as the length of the 1-alkyl group was increased. Under the same conditions, extraction of alkali metal chlorides into solutions of DC18C6 in chloroform, nitrobenzene, and 1-octanol was undetectable. The extraction selectivity order for DC18C6 in the RTILs was K+ > Rb+ > Cs+ > Na+ > Li+. As the alkyl group in the RTIL was elongated, the K+/ Rb+ and K+/Cs+ selectivities exhibited general increases with the larger enhancement for the latter. For DC18C6 in 1-octyl-3-methylimidazolium hexafluorophosphate, the alkali metal cation extraction selectivity and efficiency were unaffected by variation of the aqueous-phase anion from chloride to nitrate to sulfate. 相似文献
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A theoretical model of the laser radiation transmittance of insulator nanocomposites containing low concentrations of nanoparticles
is proposed. It is shown that the basic mechanisms of low-threshold effects of nonlinear absorption and scattering of laser
radiation are, first, the induction of electric dipole moments of nanoparticles in the external field and, second, the orientation
of nanoparticles along the polarization direction of this field. The behavior of the transmittance in the vicinity of the
central region of a separate absorption band and the dependence of the depth of this band in the transmittance spectrum on
the external radiation intensity are considered. 相似文献
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