共查询到20条相似文献,搜索用时 15 毫秒
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G. Passatore 《Nuclear Physics A》1975,248(3):509-517
The predictions of the energy dependence of the real part of the empirical optical potential implied by the formulations based on nuclear reaction theories and on the multiple scattering approach are compared. The recent data on the nucleon-nucleon forward scattering amplitude obtained from phase-shift analyses, direct measurements and dispersion relations are used. The meaning of the local expression obtained in the multiple scattering formalism is discussed and it is shown that its implications agree with those derived by the nuclear-theories approach. 相似文献
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V. A. Kuz’min N. N. Mikhailov N. A. Skibitskaya 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2013,7(5):907-912
The influence of microstructure wettability on the oil distribution in pores is studied for oil-saturated deposits with highly viscous oil. The character of the oil distribution in the pores, depending on the degree of their hydrophobicity, is shown for carbonate rocks with different oil saturation. The given data indicate the relation between the character of the oil distribution in the pores and the microstructure wettability. 相似文献
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V. I. Nefedov 《Journal of Electron Spectroscopy and Related Phenomena》1995,70(3):207-215
The influence of the molecular cavity shape and of the angular dependence of the dielectric constants in a low symmetry crystal on the polarization energy Epol, induced by electron holes in the bulk and on the surface of the molecular solids, is investigated. The analytical expressions are obtained and evaluated for SF6, SO2, CS2 and seven aromatic organic compounds. The theory is in good agreement with the experimental data. The deviation of the molecular cavity shape from a sphere has a marked influence on the calculated extra-atomic relaxation energy in large molecules. The Epol value depends on the hole position. In SF6 this value is larger for F atom photoionization than for S atom photoionization. The angular dependence of the dielectric constants has a smaller effect on the Epol value than does that of the cavity shape. The Epol value on the surface of a single crystal depends on the crystallographic plane. The polarization energy for CO molecules on the top of Xe layers on Al(111) is calculated in dependence on the number of Xe layers. The calculated extra-atomic relaxation energy is in good agreement with experiment. 相似文献
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M. M. El-Nicklawy A. F. Hassan S. M. M. Salman A. Abdel-Aty 《Optics & Laser Technology》2005,37(5):363-368
The bistability behavior of a nonlinear absorbing medium inside a Fabry–Perot resonator driven by an external quasi-monochromatic field is studied. The driving field is considered to be of a Gaussian and Lorentzian spectral line profile. The effect of the spectral half-width on the bistability is discussed. The mathematical treatment is carried out through an interferometric point of view. The dependence of the driving intensity required to initiate bistability on the standing wave established inside the resonator is represented. 相似文献
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We obtain the solution to the problem of the skin effect in a metal with specular-diffusion boundary conditions for arbitrary
values of the anomaly parameter in the form of the Neumann series. For this purpose, we develop a method based on the idea
of representation of not only the boundary condition imposed on the field (as is conventionally done), but also the boundary
condition imposed on the distribution function, in the form of a source. The specular reflectance is an arbitrary function
of the angle of incidence of electrons on the metal surface. 相似文献
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S. S. Anan’ev S. A. Dan’ko Yu. G. Kalinin Fan Ye Yi Qin Shuqing Jiang Feibiao Xue Zhenghong Li Jianlun Yang Rongkun Xu 《JETP Letters》2010,92(11):735-741
The dynamics of the hot component of the plasma of imploding multiwire arrays has been analyzed using the time behavior of
the X-ray spectral lines of multicharge ions. The spectra of H- and He-like aluminum ions with nanosecond time resolution
have been detected using electron-optical chronography in experiments on the implosion of multiwire arrays by mega-ampere
currents. The simultaneous appearance of the resonance lines of H- and He-like ions implies that the hot plasma whose electron
temperature is higher than 0.5 keV has existed on the axis before the implosion of the main mass of the liner. The further
dynamics of the intensity of the lines is primarily attributed to an increase in the mass of the emitting plasma. 相似文献
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The influence of the wear of a tube graphite furnace and the morphological features of its surface on the formation of an atomic-absorption signal has been investigated. Electron-microscopic and mass-spectrometric investigations have shown that, prior to atomization, copper in the form of elementary metal microparticles is found not only on the surface of the furnace but also in the bulk of its pores. Free atoms are formed as a result of the concurrent processes of atomization of a sample on the surface of the furnace and in the bulk of its pores. The change in the apparent energy of formation of free atoms of metals interacting actively with graphite in the process of atomization and the inflection on their Arrhenius plot have been explained qualitatively. 相似文献
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The possible influence of the gravitation on the solidification of the binary systems in the framework of the stochastic theory is discussed. The considerations are based on the change of the kinetic parameters of the phase transformation with the change of the concentration of clusters in the melt. 相似文献
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The formation and destruction of the surface silicide on W(100) after cleaning of the sample surface and bulk in various regimes
is studied by high-resolution Auger electron spectroscopy. It is shown that the cleanness of the bulk has practically no influence
on the laws governing the formation of the surface silicide when Si atoms are adsorbed on a heated W surface and that almost
up to completion of its formation all the silicon atoms impinging on the surface, from the very first, remain on it and are
incorporated into the surface silicide. The destruction of the surface silicide depends in a definite manner on the state
of the bulk, and at T=1400 K it is apparently limited in the early stages by the passage of Si atoms from the surface to the subsurface layer and
in subsequent stages by the diffusion of silicon within the substrate. The bulk silicon density that limits the destruction
of the surface silicide is estimated.
Zh. Tekh. Fiz. 67, 137–140 (July 1997) 相似文献
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A prototype RPC with position resolution less than 1 mm has been produced and studied. Based on this RPC detector, the effect of the width of the integrated FADC time window on the position resolution of a RPC has been studied experimentally and theoretically. The results of theoretical calculation and experimental measurement have shown good agreement. 相似文献
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We propose one a variant of calculation of the energy spectrum of bound state systems with relativistic corrections. In the
framework of quantum field theory, an expression that takes into account relativistic corrections to the mass of the bound
state with a known nonrelativistic pair interaction potential is proposed on the basis of calculating the asymptotic behavior
of correlation functions of the corresponding field currents with the necessary quantum numbers. Excluding the time variables
allows one to determine nonperturbative corrections to the interaction potential. The following results have been obtained
in the framework of this approach. The nonperturbative corrections arising due to the relativistic nature of a system to the
interaction Hamiltonian are determined. The dependence of the constituent mass of bound-state forming particles on the free
state mass and on the orbital and radial quantum numbers is analytically derived. The energy level shift of muonic hydrogen
taking into account relativistic corrections is calculated. The energy spectrum of a wide class of potentials that describe
the Coulomb bound state is analytically derived with relativistic corrections. The mass spectrum of the glueballs and the
constituent masses of the gluons are analytically calculated taking into account spin-orbit, spin—spin, and tensor interactions.
Our numerical results have shown very good agreement with the lattice data. Taking into account nonperturbative and nonlocality
characters of interactions, the mass spectrum of the mesons consisting of light-light and light-heavy quarks with orbital
and radial excitations is determined. Our results show that good agreement with the experimental data for the slope and the
intercept of the Regge trajectory can be obtained only taking into account the nonperturbative and the nonlocal characters
of interactions. The dependences of the constituent masses of constituent particles on the masses of a free state are certain.
When quarks are light, then the difference between current and valent masses of quarks is greater than valent masses of quarks,
and when quarks are heavy, then the difference between these masses is insignificant. One of the alternative variants of taking
nonlocality into account has been suggested for the definition of properties of hadrons at large distances. The dependence
of the constituent masses of constituent particles on the radius of confinement is determined. 相似文献
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We report on the optical parameters of the semiconductor thin films determination. The method is based on the dynamical modeling of the spectral reflectance function combined with the genetic optimization of the initial model. The spectral dependency of the thin film optical parameters computation is based on the optical transitions modeling. The combination of the dynamical modeling and the genetic optimization enable comfortable analysis of the spectral dependences of the optical parameters and incorporation of the microstructure effects on the multilayer system optical properties. The results of the optical parameters of i-a-Si thin films determination are presented. 相似文献
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V. P. Filippov D. E. Lauer Yu. A. Lauer N. I. Kargin P. G. Goloborodko I. V. Goloborodko A. M. Poliakov 《Hyperfine Interactions》2013,214(1-3):157-162
A study of the sea atmosphere influence on the corrosion products of steel constructions near Sochi at difference distances from the sea has been made. The phases and compositions of the corrosion products formed on different sides of steel construction elements were examined by using Mössbauer spectroscopy (at 298 and 78 K). The results show that phases and composition distributions in oxide films are different on different parts of the constructions. The differences depend not only on the distance from the sea, but from their relative orientation to the sea also. The phase structure of the oxide films on different positions is identified. 相似文献
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A prototype RPC with position resolution less than 1 mm has been produced and studied. Based on this RPC detector, the effect of the width of the integrated FADC time window on the position resolution of a RPC has been studied experimentally and theoretically. The results of theoretical calculation and experimental measurement have shown good agreement. 相似文献