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11.
An algorithm for the recovery of the parameter field of elastic waves by the method diffraction tomography is suggested. A priori information is taken into account in probabilistic form. Under different assumptions on the statistical correlations of the parameter field, different modifications of the algorithm are considered. The notion of the information sensitivity of the measurement field with respect to a fixed linear parameter field is introduced. It is shown that the greater the energy of the useful signal that has passed through the medium with a nonhomogeneity, the higher the information sensitivity of a given system of tomographic functionals.Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 239, 1997, pp. 225–235.This work was supported in part by the Russian Foundation for Basic Research (Grant No. 96-05-65904). 相似文献
12.
V. D. Borman A. V. Zenkevich S. Ch. Lai V. N. Nevolin M. A. Pushkin V. N. Tronin V. I. Troyan J. Chevallier 《JETP Letters》2000,72(3):148-152
The results of experimental studies on pulsed laser deposition of the Au atoms on the NaCl(100) surface are reported. Under the conditions far from thermodynamic equilibrium, the spatial ordering was observed in an ensemble of gold clusters at the initial deposition stage. A mechanism based on the idea of fractal structure decomposition caused by the development of unstable concentration modes in the condensed substance is proposed. 相似文献
13.
V. D. Borman A. A. Belogorlov A. M. Grekhov G. V. Lisichkin V. N. Tronin V. I. Troyan 《Journal of Experimental and Theoretical Physics》2005,100(2):385-397
The paper presents the results of an experimental study of the percolation transition in filling by nonwetting liquids of nanoporous bodies of various natures with different specific surface areas and mean pore and granule sizes. The liquid that we used was an aqueous solution of ethylene glycol. The hysteresis and non-outflow phenomena observed in this transition at various (known) surface energies of liquids were studied by varying the concentration of ethylene glycol. This helped us explain the mechanism of the percolation transition in filling nanoporous bodies with nonwetting liquids. It was shown that, to quantitatively describe the observed dependences in terms of percolation theory taking into account energy barriers to filling, we must use a non-scaling distribution function of clusters of accessible and filled pores that admits the formation of pore clusters of arbitrary dimensions. 相似文献
14.
Ermizin K. V. Bondaletov V. G. Lyapkov A. A. Bondaletova L. I. Troyan A. A. Ionova E. I. Manankova A. A. Manzhai V. N. 《Russian Journal of Applied Chemistry》2009,82(12):2230-2237
Production of a wide range of hydrocarbon oligomers on the basis of boiler outputs of column K-27 in Plant EP-300 (Manufacture
“Etilen”, Tomsk). A successful outcome can be attained without a radical change in the column operation by governing the rectification
mode and by insignificant reorganization of the movement of flows that simultaneously improve the technical performance of
heavy pyrolysis tar obtained in the same setup. The possibility of obtaining both aromatic and cycloaliphatic oligomers of
different compositions and structures using catalytic systems based on titanium chlorides and organoaluminum compounds (OAC)
produced in the catalyst manufacture Tomskneftechim was demonstrated. 相似文献
15.
Aksenov S. N. Mironovich A. A. Lyubutin I. S. Ivanova A. G. Troyan I. A. Sadykov R. A. Saxen-Montua Siddharth S Gavriliuk A. G. 《JETP Letters》2021,114(12):742-750
JETP Letters - The vibrational properties of yttrium iron garnet Y3Fe5O12 at a high quasihydrostatic pressure are studied by the Raman spectroscopy method. Raman spectra are measured in a... 相似文献
16.
The propagation of current perturbations on superconducting cosmic strings is considered. The conditions for the existence
of discontinuities similar to shock waves have been found. The formulas relating the string parameters and the discontinuity
propagation speed are derived. The current growth law in a shock wave is deduced. The propagation speeds of shock waves with
arbitrary amplitudes are calculated. The reason why there are no shock waves in the case of time-like currents (in the “electric”
regime) is explained; this is attributable to the shock wave instability with respect to perturbations of the string world
sheet. 相似文献
17.
B. I. Ermolaev M. Greco S. I. Troyan 《The European Physical Journal C - Particles and Fields》2011,71(9):1750
In this paper we present a new derivation of QCD factorization. We deduce the k
T
and collinear factorizations for the DIS structure functions by consecutive reductions of a more general theoretical construction.
We begin by studying the amplitude of forward Compton scattering off a hadron target, representing this amplitude as a set
of convolutions of two blobs connected by the simplest, two-parton intermediate states. Each blob in the convolutions can
contain both the perturbative and non-perturbative contributions. We formulate conditions for separating the perturbative
and non-perturbative contributions and attributing them to the different blobs. After that the convolutions correspond to
QCD factorization. Then we reduce this totally unintegrated (basic) factorization first to k
T
-factorization and finally to collinear factorization. In order to yield a finite expression for the Compton amplitude, the
integration over the loop momentum in the basic factorization must be free of both ultraviolet and infrared singularities.
This obvious mathematical requirement leads to theoretical restrictions on the non-perturbative contributions (parton distributions)
to the Compton amplitude and the DIS structure functions related to the Compton amplitude through the Optical Theorem. In
particular, our analysis excludes the use of the singular factors x
−a
(with a>0) in the fits for the quark and gluon distributions because such factors contradict the integrability of the basic convolutions
for the Compton amplitude. This restriction is valid for all DIS structure functions in the framework of both k
T
-factorization and collinear factorization if we attribute the perturbative contributions only to the upper blob. The restrictions
on the non-perturbative contributions obtained in the present paper can easily be extended to other QCD processes where the
factorization is exploited. 相似文献
18.
Yu. A. Troyan S. G. Arakelyan A. V. Belyaev A. P. Ierusalimov E. B. Plekhanov A. Yu. Troyan 《Physics of Particles and Nuclei Letters》2011,8(6):557-561
The results of a search for and study of the scalar 0+ [0++] σ0 mesons in a π+π− system produced in the reaction np → npπ+π− at the quasi-monochromatic neutron beam momentum P
n
= (3.83 ± 0.12) GeV/c are presented as derived from analyzing the data obtained during the exposure of a 1-meter hydrogen bubble chamber at the
Laboratory of High Energy, Joint Institute for Nuclear Research (LHE JINR). It is found that there is a significant bump in
the effective mass distribution at Mp+ p- = (404 ±5)MeV/c2M_{\pi ^ + \pi ^ - } = (404 \pm 5)MeV/c^2 and Γresexp = (14±5.4) MeV/c
2, which is observed with more than four standard deviations from the background. The spin of this resonance is estimated to
be most likely equal to zero. Its quantum numbers are found to be 0+ [0++]. 相似文献
19.
V.I. Troyan P.V. BorisyukV.A. Kashurnikov A.V. KrasavinV.D. Borman V.I. Tronin 《Physics letters. A》2013
Results of experimental research of exciton-like two-hole states in nanoclusters of narrow-band metals (Ni, Cu) on surface of high-oriented pyrolitic graphite by X-ray photoelectron and Auger electron spectroscopy are presented. It was found that the evolution of the electronic structure in Ni nanoclusters with the decreasing of their sizes can lead to appearance of long-living two-hole states in the valence band. One-particle and two-particle density of states are analyzed, and the Auger-electron spectra confirming the presence of the bound and localized states are obtained. 相似文献
20.
We observed a strong difference of the pressure dependence of the infrared (IR) active molecular vibron of hydrogen in phase IV in the 200–310 GPa pressure range in comparison with the Raman vibrons. While the Raman vibron strongly splits (~250 cm?1) at the transition from phases III to IV at 220 GPa, the IR vibron nearly does not change. This small spitting of IR vibron is not described by the graphene-like structure proposed for phase IV. The combined pressure dependence of Raman and IR vibrons provides a sensitive test for further theoretical models of phase IV. 相似文献