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排序方式: 共有51条查询结果,搜索用时 31 毫秒
1.
George R. Rossman Robert D. Shannon Robert K. Waring 《Journal of solid state chemistry》1981,39(3):277-287
Single-crystal optical absorption spectra of NiO, NiTiO3, NiWO4, NiV2O6, NiNb2O6, Ni2SiO4, Ni3V2O8, LiNiPO4, Li2Ni2Mo3O12, SrNiTeO6, LiScSiO4:Ni, MgSiO3:Ni, and (Mg,Ni)2SiO4 are presented for the purpose of comparing the spectra of yellow and green Ni2+ compounds. Powder spectra of NiTiO3, NiWO4, NiV2O6, NiNb2O6, and Ni3V2O8 in the ultraviolet region help elucidate the more intense charge transfer bands. Bright yellow color results when Ni2+ is in a six-coordinated site significantly distorted from octahedral symmetry. Increased absorption intensity occurs when the metal ion d-d bands are in proximity to an ultraviolet charge transfer band. 相似文献
2.
Francis E. Burstall Udo Hertrich-Jeromin Wayne Rossman 《Comptes Rendus Mathematique》2012,350(7-8):413-416
We show how linear Weingarten surfaces appear as special Ω-surfaces and give a characterization of those linear Weingarten surfaces that allow a Weierstrass type representation. 相似文献
3.
S. Munavalli D. K. Rohrbaugh D. I. Rossman F. J. Berg G. W. Wagner H. D. Durst 《合成通讯》2013,43(16):2847-2854
Incorporation of fluorine and fluorine containing groups such as trifluoromethyl and trifluoromethylthio moieties considerably enhances the biopharmacological properties of the parent precursors. Trifluoromethylsulfenylation of masked carbonyl functions, such as the enamines using N-(trifluoromethylthio)phthalimide is described in this communication. 相似文献
4.
Francis E. Burstall Udo Hertrich-Jeromin Wayne Rossman 《Comptes Rendus Mathematique》2010,348(11-12):661-664
We propose a Lie geometric point of view on flat fronts in hyperbolic space as special Ω-surfaces and discuss the Lie geometric deformation of flat fronts. 相似文献
5.
Wayne Rossman 《Journal of Geometric Analysis》2001,11(4):669-692
We describe local similarities and global differences between minimal surfaces in Euclidean 3-space and constant mean curvature
1 surfaces in hyperbolic 3-space. We also describe how to solve global period problems for constant mean curvature 1 surfaces
in hyperbolic 3-space, and we give an overview of recent results on these surfaces. We include computer graphics of a number
of examples. 相似文献
6.
7.
We consider diffraction by a semi-infinite crack located alonga fusion interface between two differing elastic media. Twotypes of crack, namely open and partially closed cracks, areinvestigated. An open crack is modelled by a stress-free contactboundary condition and a partially closed crack is modelledby a spring contact boundary condition. For the latter, thejump in the stress across the crack is assumed to be proportionalto the jump in the displacement across the crack. This situationarises in, for example, a K-weld where the fine grain of theparent material (for example, ferritic or forged austeniticsteel) is in stark contrast with the coarse-grained weld metal(for example, austenitic weld metal). In the metal weld thedirection of the grain axis varies through the metal. However,diffraction is a local phenomenon and so the austenitic steelis assumed to have a zonal axis so that it may be modelled bya transversely isotropic composite. The ferritic or forged austeniticsteel will be modelled as an isotropic material. 相似文献
8.
In this paper we give the precise index growth for the embedded hypersurfaces of revolution with constant mean curvature
(cmc) 1 in (Delaunay unduloids). When n=3, using the asymptotics result of Korevaar, Kusner and Solomon, we derive an explicit asymptotic index growth rate for finite
topology cmc 1 surfaces with properly embedded ends. Similar results are obtained for hypersurfaces with cmc bigger than 1
in hyperbolic space.
Received: 6 July 2000; in final form: 10 September 2000 / Published online: 25 June 2001 相似文献
9.
R J Nozza R N Rossman L C Bond S L Miller 《The Journal of the Acoustical Society of America》1990,87(1):339-350
The effects of noise on 7- to 11-month-old infants' speech-sound discrimination (/ba/vs/ga/) were determined using a conditioned head-turn procedure. Variation in performance as a function of signal-to-noise ratio (S/N) was estimated by testing each infant at four S/N's (-8, 0, 8, and 16 dB). Adults were tested for comparison at four S/N's (-12, -8, -4, and 0 dB). The S/N's were chosen based on pilot data. Performance varied monotonically with S/N for both age groups, but infants required greater S/N than adults to achieve comparable levels of performance. Both groups were also tested using an adaptive (1-up, 1-down) threshold procedure with a 3-dB step size. There was a group mean difference in threshold of 5.8-dB S/N favoring the adults. Weighted group psychometric functions, derived from the responses obtained in the adaptive runs, showed good correspondence with the data points at the four S/N's. The slopes of these functions were the same (7.5%/dB) for infants and adults. The results suggest that infants are at a greater disadvantage than adults when processing speech in noise and that concern over the effects of a noisy environment on the acquisition of language is justified. In addition, the adaptive threshold procedure can be used as an efficient way to estimate the limits of discrimination ability as a function of S/N or intensity, both for individual subjects and for groups of subjects, in developmental research. 相似文献
10.
The family of embedded, singly periodic minimal surfaces of Riemann have as limit-surfaces the helicoid, the catenoid, a single plane, or an infinite set of equally-spaced parallel planes. 相似文献