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131.
A. V. Potapov V. A. Panfilov L. A. Surin B. S. Dumesh 《Journal of Experimental and Theoretical Physics》2010,111(5):770-775
A second-order perturbation theory, developed for calculating the energy levels of the He-CO binary complex, is applied to
small He
N
-CO clusters with N = 2−4, the helium atoms being considered as a single bound object. The interaction potential between the CO molecule and
HeN is represented as a linear expansion in Legendre polynomials, in which the free rotation limit is chosen as the zero approximation
and the angular dependence of the interaction is considered as a small perturbation. By fitting calculated rotational transitions
to experimental values it was possible to determine the optimal parameters of the potential and to achieve good agreement
(to within less than 1%) between calculated and experimental energy levels. As a result, the shape of the angular anisotropy
of the interaction potential is obtained for various clusters. It turns out that the minimum of the potential energy is smoothly
shifted from an angle between the axes of the CO molecule and the cluster of θ = 100° in He-CO to θ = 180° (the oxygen end)
in He3-CO and He4-CO clusters. Under the assumption that the distribution of helium atoms with respect to the cluster axis is cylindrically
symmetric, the structure of the cluster can be represented as a pyramid with the CO molecule at the vertex. 相似文献
132.
On the basis of the three-dimensional theory of elasticity, we consider the features of propagation of harmonic waves in a
hollow cylinder with screw anisotropy. The main attention is focused on studying axisymmetrical oscillations. To describe
low-frequency long-wavelength longitudinal-torsional oscillations by perturbation theory methods, we construct an applied
theory and evaluate the area of its applicability. To analyze high-frequency oscillations, a numerical method of determining
the critical frequencies and dispersion curves is developed and implemented. It is shown that in the axisymmetrical case,
screw anisotropy generates a relation between longitudinal and torsion oscillations, which is mathematically described by
the amplitude coefficients of homogeneous waves. 相似文献
133.
E. N. Borodin S. Seyedkavoosi D. Zaitsev B. Drach K. N. Mikaelyan P. E. Panfilov M. Yu. Gutkin I. Sevostianov 《Physics of the Solid State》2018,60(1):120-128
Theoretical models of viscoelastic behavior and plastic deformation mechanisms of human dentin are considered. Using the linear viscoelasticity theory in which creep and relaxation kernels have the form of fraction-exponential functions, numerical values of instantaneous and long-time Young’s moduli and other characteristics of dentin viscoelasticity under uniaxial compression are found. As dentin plastic deformation mechanisms, mutual collagen fiber sliding in the region of contact of their side surfaces, separation of these fibers from each other, and irreversible tension of some collagen fibers, are proposed. It is shown that the second mechanism activation requires a smaller stress than that for activating others. The models of plastic zones at the mode I crack tip, which correspond to these mechanisms, are studied. It is shown that the plastic zone size can increase from a few hundreds of nanometers to hundreds of micrometers with increasing applied stress. 相似文献
134.
V. L. Auslender V. E. Nekhaev A. D. Panfilov A. A. Tuvik 《Radiation Physics and Chemistry》1999,54(6):400-618
The ILU-type industrial electron accelerators are developed in BINP sins 1967. Their energy range is 0.7–4.0 MeV at beam power of 20–50 kW. The comparison of the irradiation results after bilateral and four-sided irradiation of cables and tubes is given. It is shown that the required electron energy and beam power in the case of four-sided irradiation are sufficiently lower than in the case of bilateral irradiation, resulting in an increase of productive rate of the process and improvement of treatment quality. The installations for four-sided irradiation of cables and tubes are based on the industrial electron accelerators type ILU. 相似文献