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11.
Fiber optic sensors are typically used with expensive tunable lasers or optical spectrum analyzers for wavelength interrogation. We propose to replace the tunable laser by a broadband optical source incorporated with a novel thin linewidth acousto-optic tunable filter. It utilizes optical beam expanders constituted by photonic crystal rows of air holes in LiNbO(3) waveguide. A new design is numerically studied for a short structure (with 32 photonic crystal rows) by a two-dimensional finite-difference time-domain method. Extrapolation of these results to larger structure sizes (about 1 cm) demonstrates the possibility to develop compact interrogators with 0.4 pm wavelength resolution and 40 nm tunable range around 1550 nm. 相似文献
12.
A. V. Tsarev 《Journal of Mathematical Sciences》2007,144(2):4013-4022
We study quotient divisible mixed groups. For these groups we consider the pseudorational rank, a new invariant introduced
by A. A. Fomin.
__________
Translated from Fundamentalnaya i Prikladnaya Matematika, Vol. 11, No. 3, pp. 201–213, 2005. 相似文献
13.
It is shown that the lattice of all totally composition formations of finite groups is algebraic.
相似文献14.
15.
A dependence of the thickness of the surface layer on the mechanical and wave characteristics of polymers has been obtained from joint solution of the equations of surface-wave motion and surface-layer equilibrium. From the dependence derived, the thicknesses of the surface layers have been calculated for four polymers. The dependence of surface-layer thickness on mechanical properties of the polymers and loading characteristics has been established.Institute of the Chemistry of High-Molecular-Weight Compounds, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Mekhanika Polimerov, No. 2, pp. 195–201, March–April, 1972. 相似文献
16.
17.
Journal of Applied Spectroscopy - 相似文献
18.
A. V. Tsarev 《Siberian Mathematical Journal》2008,49(4):758-764
We study various morphisms of modules over the ring of pseudorational numbers R. We obtain a criterion for a quasi-isomorphism between finitely generated R-modules, introduce the concept of a pseudohomomorphism, and prove that the Krull-Remak-Schmidt theorem holds in the category of pseudohomomorphisms of finitely generated R-modules. 相似文献
19.
I. V. Mashechkin M. I. Petrovskii D. V. Tsarev 《Moscow University Computational Mathematics and Cybernetics》2016,40(4):179-184
A new method for detecting user access to irrelevant documents based on estimating the document text membership in typical subject areas of the analyzed user is proposed. The typical subject areas are formed using subject area modeling implemented via orthonormal nonnegative matrix factorization. An experimental study with real corporate correspondence formed from an Enron data set demonstrates the high classification accuracy of the proposed method, compared to traditional approaches. 相似文献
20.
V. N. Tsarev S. I. Konkin N. M. Loim E. S. Kelbysheva L. N. Popova P. V. Petrovskii V. A. Davankov K. N. Gavrilov 《Russian Journal of Coordination Chemistry》2007,33(9):656-660
The planar chiral diaryl phosphorimidite ligand containing additional C-stereocenters and neutral and cationic palladium(II) chelates with this ligand, cis-[Pd(η2-P,N)Cl2] and [Pd(Allyl)(η2-P,N)]BF4, were synthesized for the first time. The possibility of using these compounds in asymmetric allylic alkylation of 1,3-diphenylallyl acetate with dimethyl malonate in an optical yield of up to 73% was demonstrated. 相似文献