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111.
Surface plasmon-phonon polaritons (SPPP’s) of types 3 and 4 are investigated in doped anisotropic single crystals of hexagonal
silicon carbide (6H-SiC) in the orientation corresponding to K⊥C and xy⊥C. It is shown that a dispersion dependence of the type-3 SPPP’s bounded by K appears in 6H-SiC when the plasmon frequency increases to ν
p⊥⩾350 cm−1. At ν
p⊥⩾400 cm−1, ν
s(K) exists for type-4 SPPP’s in the frequency range Ω
∥
+
<ν<
⊥
+
. When the concentration of free charge carriers is increased, the dispersion curves are displaced toward higher frequencies.
The conditions for the existence of type-3 and type-4 SPPP’s in 6H-SiC are determined.
Fiz. Tverd. Tela (St. Petersburg) 40, 636–639 (April 1998) 相似文献
112.
A.G. Maksimochkin S.V. Pasechnik V.A. Tsvetkov D.A. Yakovlev G.I. Maksimochkin V.G. Chigrinov 《Optics Communications》2007,270(2):273-279
A simple experimental method and a set-up to control light beams in the plane of liquid crystal (LC) cell is developed. The main idea of the method is the reflection and the refraction of light beams propagating in a plane of LC layer from the boundary, which separates the regions of a liquid crystal cell with different director orientations and refractive indices. This boundary can be produced by electric field applied to the LC layer with a planar homogeneous orientation. The disclination lines that separate the extremely sharp changes of LC orientation can be also used for this purpose. The possibility of discrete deflection of light beam from the initial direction is shown. A computer simulation confirmed that the proposed experimental geometry was most suitable to control intensity of extraordinary rays propagating in the plane of liquid crystal layer. 相似文献
113.
114.
Sergey Pasechnik Ildar Nasibullayev Dina Shmeliova Valentin Tsvetkov Liu Zhijian 《Liquid crystals》2013,40(10):1153-1165
We present an experimental study of thin liquid crystal (LC) layers under the action of a harmonically varied pressure gradient. Optical measurements were performed to register the linear oscillations of a nematic director related to homeotropic and homeoplanar (hybrid) initial states. In the latter case one of the inner surfaces of the rectangular channels was treated by ultraviolet light to provide a relatively weak planar anchoring. The optical response of hybrid and homeotropic LC cells under an oscillating pressure gradient was investigated in relation to on the amplitude and frequency of the pressure gradient. A hydrodynamic model is developed taking into account the LC polar anchoring strength and the surface viscosity responsible for a fast LC surface dynamics. Our estimates show that the thickness of the boundary layer corresponding to the surface viscosity does not exceed 10?6 m, and further experiments are needed with thinner LC cells and higher frequency oscillations to achieve a more precise value. An oscillating Poiseuille flow in the hybrid cell was found to be useful for characterizing elastic and viscous properties of a weakly anchoring LC surface layer in a fast surface dynamic process. 相似文献
115.
R. S. Pasechnik B. Z. Kopeliovich 《The European Physical Journal C - Particles and Fields》2011,71(12):1827
We consider the diffractive Drell–Yan process in proton–(anti)proton collisions at high energies in the color dipole approach.
The calculations are performed at forward rapidities of the leptonic pair. The effect of eikonalization of the universal “bare”
dipole–target elastic amplitude in the saturation regime takes into account the principal part of the gap survival probability.
We present predictions for the total and differential cross sections of the single-diffractive lepton-pair production at RHIC
and LHC energies. We analyze implications of the QCD factorization breakdown in the diffractive Drell–Yan process, which is
caused by a specific interplay of the soft and hard interactions, resulting in rather unusual properties of the corresponding
observables. 相似文献
116.
Dmitrii V. Pasechnik 《European Journal of Combinatorics》1996,17(8):751-755
It is shown that there is only one extension of GQ(3, 9) namely the one admitting the sporadic simple groupMcLas a flag-transitive automorphism group. The proof depends on a computer calculation. 相似文献
117.
G. V. Bodrin M. P. Pasechnik A. G. Matveeva R. R. Aysin S. V. Matveev E. I. Goryunov T. V. Strelkova V. K. Brel 《Russian Journal of General Chemistry》2018,88(9):1792-1799
1-Hydroxy-3-(5,7-dimethyl-2-oxo-1,2-dihydro-1,8-naphthyridin-1-yl)propylidenebisphosphonic acid has been synthesized. The structure of the acid and its precursors synthesized for the first time, 3-(5,7-dimethyl-2-oxo-1,2-dihydro-1,8-naphthyridin-1-yl)propionic acid and the corresponding methyl ester, in the solid state and in the DMSO solution has been elucidated by means of vibrational (IR and Raman) and multinuclear (1H, 13C, and 31P) NMR spectroscopy. 相似文献
118.
M. P. Pasechnik Z. A. Starikova A. I. Yanovsky I. M. Aladzheva E. I. Matrosov T. A. Mastryukova M. I. Kabachnik 《Russian Chemical Bulletin》1997,46(4):805-812
The reaction of (carbamoylmethyl)diphenylphosphine sulfide with AgNO3 yields the polymeric complex [Ag2{Ph2P(S)CH2C(O)NH2}2(NO3)2]
n
. Its structure was established by X-ray diffraction analysis. The coordination environments about both Ag+ cations are formed by five donor atoms, two of which are bonded to the metal atom substantially more weakly than the remaining
three atoms. The compositions of the coordination polyhedra are different: ({AgSO′(C)O(N)O2(N′)} and {AgS′ SO(C)O2(N)}). The coordinated ligands differ in their functions: one ligand chelates the metal cation and its sulfur atom is additionally
bonded to the second cation, while the second ligand acts as a bridge between the two different cations. The structure of
the complex and the character of the interaction between the ligand and AgNO3 are substantially affected by the network of hydrogen bonds.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 838–845, April, 1997. 相似文献
119.
V. A. Balandin S. V. Pasechnik V. I. Prokopjev O. Ya. Shmelyoff 《Liquid crystals》2013,40(10):1319-1325
Abstract The results of a low frequency ultrasonic study of 4-n-butyloxybenzylidene-4'-n-butylaniline (BBBA) in the vicinity of the smectic A-nematic transition are presented. The frequency and temperature dependence of the parameters describing the anisotropic ultrasound absorption are determined experimentally and compared with the predictions of fluctuation and relaxation theories of the smectic A-nematic transition. It is shown that no single theory could explain all of the experimental data. 相似文献
120.
Margarit P. Pasechnik Inga M. Aladzeva Olga V. Bykhovskaya Aleksandr P. Pisarwskii Eugenii L Matrosov Tatyana A. Mastryukova 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4)
Abstract Under conditions of interphase catalysis complexiDg agenta L1, L2 and L3 have been synthesizedl. Using spectral and X-ray methods complex fomation of thises ligands with AgNO3 has been studied 相似文献