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2011Lin E. E. Detonation zone width determination based on uncertainty principle // Technical Physics Letters. 2011. Т. 37. № 5. С. 449 - 450.Russian Federal Nuclear Center (VNIIEF), Sarov, Russia A phenomenological approach to describing detonation phenomena in high explosives is proposed, according to which the zone of relaxation processes (detonation zone) is treated as an excited quantum - mechanical system in the coherent state. The corresponding definition of the detonation zone width is not related to the kinematic parameters of the detonation wave. Lin E. E. Cluster mechanism of diamond synthesis under severe cavitation conditions // Technical Physics Letters. 2011. Т. 37. № 7. С. 593 - 595. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia The process of diamond synthesis is considered as the formation and growth of nanoclusters in the presence of phonon excitations in their crystal lattices. Theoretical estimations obtained within this approach qualitatively agree with experimental data on the cavitation synthesis of a diamond. Egorov N. I., Boriskov G. V., Bykov A. I., Kuropatkin Y. P., Lukyanov N. B., Mironenko V. D., Pavlov V. N. Use of pulsed radiography for investigation of equations of state of substances at megabar pressures // Contributions to Plasma Physics. 2011. Т. 51. № 4. С. 333 - 338. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia A method of density measurement for substances that are isentropically compressed up to megabar pressures is described in the paper. Measurement results for condensed hydrogen isotopes and aluminum are presented. These results, afterwards, are used for construction of hydrogen isotopes «cold» isentropes. Experimental x - ray images of the facilities with the hydrogen isotopes, compressed up to several megabars are presented in the paper. Reshetov A1., Beygelzimer Y.1, Varyukhin V.1, Korshunov A.2, Smolyakov A.2, Kaganova I.2, Morozov A.2 Distribution of mechanical properties by volume in titanium billets processed by twist extrusion // Materials Science Forum. 2011. Т. 667 - 669. С. 851 - 856. 1Donetsk Institute for Phisics&Engineering of the National Academy of Science of Ukraine 2Russian Federal Nuclear Center (VNIIEF), Sarov, Russia The influence of multipass processing by Twist Extrusion ( TE ) on distribution of mechanical properties by volume in commercially pure ( CP ) titanium billets is investigated. Experiments show that the mechanical properties are almost homogeneous in the billet cross - section already after the second pass of TE. This can be explained by mixing effect and saturation of properties as well. Warm TE leads to the formation of high strength properties in combination with high plasticity. Ultimate and yield stresses of the billet processed by two cycles of TE increased, in comparison with initial state, by 30% and 60% respectively. The value of the reduction in area remained at the initial value. This fact is indicating a high technological plasticity of the material, i.e. its ability for further shaping by metal forming methods. Gorbatenko M. V., Neznamov V. P. Uniqueness and self - conjugacy of dirac hamiltonians in arbitrary gravitational fields // Physical Review D - Particles, Fields, Gravitation and Cosmology. 2011. Т. 83. № 10. С. 105. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia Proofs of two statements are provided in this paper. First, the authors prove that the formalism of the pseudo - Hermitian quantum mechanics allows describing the Dirac particles motion in arbitrary stationary gravitational fields. Second, it is proved that using the Parker weight operator and the subsequent transition to the eta - representation gives the transformation of the Schroedinger equation for nonstationary metric, when the evolution operator becomes self - conjugate. The scalar products in the eta - representation are flat, which makes possible the use of a standard apparatus for the Hermitian quantum mechanics. Based on the results of this paper the authors draw a conclusion about solution of the problem of uniqueness and self - conjugacy of Dirac Hamiltonians in arbitrary gravitational fields including those dependent on time. The general approach is illustrated by the example of Dirac Hamiltonians for several stationary metrics, as well as for the cosmologically flat and the open Friedmann models. Vilkov Yu. V., Kravchenko A. S., Selemir V. D., Terekhin V. A. Simulation of the effect of a lightning current pulse using energy sources based on magneto cumulative generators //instruments and experimental techniques 2011 Volume 54, Number 3, 375 – 383. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia The results of tests of energy sources based on magneto cumulative generators, which were obtained during simulation of the effect of a lightning current pulse on a typical grounding system, are presented. A proposed numerical model of the operation of such energy sources and models of the pulsed resistance of a grounding rod satisfactorily agree with the experimental results. In the performed experiments, the amplitude of the current pulse in the grounding rod was as high as 90 kA. L’vov I. L., Sadovoy S. A., Selemir V.D., Vyalykh D. V., Dubinov A. E. Moderate - Pressure Glow Discharges With Foamy Electrolytic Cathodes // Plasma Science, IEEE Transactions on2011, T 39, №: 11, С 2500 – 2501. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia Photographic images of cathode areas of moderate-pressure glow discharges with foamy electrolytic cathodes are presented in this paper. A stationary discharge with the foamy cathode has been obtained for an aqueous solution of CuSO4 near its boiling threshold. A dynamic glow discharge with the foamy cathode has been obtained for an aqueous solution of NaHCO3. The foam in this case is formed at the expense of CO2 bubbles released in the solution. In both cases, the discharge leans on a «3 - D cathode spot» having the finite volume. Dubinov A. E., Kolotkov D. Yu., Sazonkin M. A. Nonlinear ion acoustic waves in a quantum degenerate warm plasma with dust grains // Plasma physics reports, 2011, Т 37, № 1, С. 64 – 74. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia A study is made of the propagation of ion acoustic waves in a collision less unmagnetized dusty plasma containing degenerate ion and electron gases at nonzero temperatures. In linear theory, adispersion relation for isothermal ion acoustic waves is derived and an exact expression for the linear ion acoustic velocity is obtained. The dependence of the linear ion acoustic velocity on the dust density in plasma is calculated. An analysis of the dispersion relation reveals parameter ranges in which the problem has soliton solutions. In nonlinear theory, an exact solution to the basic equations is found and examined. The analysis is carried out by Bernoulli’s pseudo potential method. The ranges of the phase velocities of periodic ion acoustic waves and the velocities of solitons are determined. It is shown that these ranges do not overlap and that the soliton velocity cannot be lower than the linear ion acoustic velocity. The profiles of the physical quantities in a periodic wave and in a soliton are evaluated, as well as the dependence of the critical velocity of solitons on the dust density in plasma. Dubinov A. E., Saikov S. K., Tsatskin A. P. Nonlinear theory of electrostatic baryonic waves in ambiplasma // Journal of experimental and theoretical physics 2011, T. 112, № 6, C. 1051 – 1060. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia A collision less nonmagnetized ambiplasma consisting of Maxwellian gases of protons, antiprotons, electrons, and a positron is considered. The dispersion relation for electrostatic baryonic waves is derived and analyzed and exact expressions for the linear wave phase velocities are obtained. Two types of such waves are shown to be possible in ambiplasma: acoustic and plasma ones. Analysis of the dispersion relation has allowed the ranges of parameters in which nonlinear solutions should be sought in the form of solitons to be found. A nonlinear theory of baryonic waves is developed and used to obtain and analyze the exact solution to the basic equations. The analysis is performed by the method of a fictitious potential. The ranges of phase velocities of periodic baryonic waves and soliton velocities (Mach numbers) are determined. It is shown that in the plasma under consideration, these ranges do not overlap and that the soliton velocity cannot be lower than the linear velocity of the corresponding wave. The profiles of physical quantities in a periodic wave and a soliton (wave scores) are plotted. Dubinov A. E., Kolotkov D. Yu. Wake waves generated by a proton bunch in an electron – positron - ion plasma // Technical physics 2011, T. 56, № 2, С. 204 – 206. Russian Federal Nuclear Center (VNIIEF), Sarov, Russia A nonlinear 1D model of longitudinal wake waves generated in relativistic epi plasma by an ultra relativistic modulated proton bunch is developed. The model is used for constructing the score of concentration profiles of the concentrations of the plasma component in the wake wave. It is shown that the wave period increases with the concentration of the ion component of the plasma and with the proton bunch density.
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