| //Росатом/ ВНИИЭФ |
Контакты
En STATE CORPORATION ROSATOM
|
|
Issue 2/2012ABSTRACTS:UDK 621.039;519.224.2 ABOUT STATISTICAL CRITERIONS UNDER SAMPLING APPROACH FOR VALIDATING THE SAFE STORAGE OF CONTAINERS WITH NUCLEAR MATERIALS / A. M. Zlobin // Р. 3 It’s presented the comparison of the American statistical criterion for sampling inspections of the containers with nuclear materials with the normative statistical requirements of the Russian Federal Norms and Rules for Nuclear Materials Control and Accounting. It’s shown that american criterion essentially determines the zero-defects statistical sample size that is necessary for assuring established probability of the presence faulty containers less In the framework of this interpretation the statistical sample sizes, calculated by the computer program Spotcheck for the Pressure and Corrosion bin and Pressure only bin, are in good agreement with American data. The basic differences of the Russian criterions from the American statistical criterion are as for the value of the probability P0 as the quantity of the “inadmissible” number of defects in the bin. Moreover, wording of the Russian statistical criterions provide for eventuality of observing faulty items in the random sample (at the same time this criterion may be fulfilment under proper increasing random sample size). UDK 534.1 ON VISUALIZING NON-LINEAR STRAIN WAVES / S. I. Gerasimov, V. I. Erofeev, V. A. Kikeev, S. A. Kholin // Р. 18 The problems concerning realizing the solitary longitudinal wave visualization are shown. The possible improvements of known technique for the wave generation are analyzed. Both the experimental results with light sensitive energetic materials for confirming the simultaneous wave generation in different samples and the flow patterns as arguments in favor of using the shadow techniques are presented. UDK 530.145.7;514.764.2;530.145.7 PHISICAL NONEQUIVALENCE OF THE SCHWARZSCHILD METRIC AND METRICS OF A CENTRALLY SYMMETRIC UNCHARGED GRAVITATIONAL FIELD ALLOWING PROBE PARTICLES TO CROSS «EVENT HORIZONS» / M. V. Gorbatenko, V. P. Neznamov // Р. 24 The quantum mechanical analysis shows that the Schwarzschild metric, which forbids classical particles from crossing the «event horizon», and the metrics, which allow particles to cross the gravitational radius (the Eddington-Finkelstein, Painlevi-Gullstrand, Lemaitre-Finkelstein, and Kruskal metrics) are physically nonequivalent. The first case provides for the existence of stationary states of Dirac particles with a real energy spectrum, while in the second case, for all the listed metrics, there exist only complex energy levels of spin 1/2 particles decaying with time. The results can lead to revisiting some concepts of the standard cosmological model related to the evolution of the universe and interaction of collapsars with surrounding matter. UDK 539.1.01 THE CAUCHY PROBLEM FOR THE CONFORMAL GEOMETRODYNAMICS EQUATIONS / M. V. Gorbatenko // Р. 31 A proof of a possibility of a correct statement about the Cauchy problem for the general relativity equations with the conformally invariant energy-momentum tensor is presented. The proof is made for harmonic coordinates in that area of space-time in which 00-component of inverse metric tensor do not equal zero. Work formulas allowed to compose computer program for finding and researching of the solutions the initial equations by numerical modeling are given. UDK 539.89 COMPARISON OF HUGONIOTS AND SHOCK ATTENUATION IN ARMCO IRON AND STAINLESS STEEL / B. A. Nadykto, A. I. Lomaikin, I. N. Pavlusha, M. O. Shirshova // Р. 43 We analyze the equation of state of iron and stainless steels 304 and 12Kh18N10T. Iron and low-alloy steel undergo the α→ε phase transition, which is not present in stainless steels 304 and 12Kh18N10T and some other high alloys. We present calculated free surface velocities as a function of time for iron and steel under conditions corresponding to experiments known from open literature. Elastoplastic properties of the materials are determined based on the comparison of the calculated velocity profiles with experimental data measured by laser interferometry. Shock attenuation in iron and stainless steel is calculated for a shock travel distance in specimens equal to 10 to 20 projectile thicknesses. The presence of the α→ε phase transition in iron and its absence in stainless steel lead to higher (by a factor of 1.5 to 2) shock attenuation in iron at large shock travel distances than in stainless steel. UDK 524.352.3; 536.464 STUDY OF BURNING IN SUPERNOVA IA / S. I. Glazyrin // Р. 57 Supernovae Ia (SNIa) are outstanding cosmological objects, that have been of primary importance in determination of the composition of the Universe. Despite four decades of investigation the clear understanding of an explosion mechanism is absent. One of the principal problem is the description of propagation of a burning flame in the presupernova – white dwarf. Observations tell us that initially slow flame accelerates and pass into detonation. The mechanism of acceleration in SNIa is still unknown, but is considered to be due to different instabilities. In this work the Landau – Darrieus instability of thin thermonuclear burning front, spreading over presupernova, is studied. The direct numerical simulation using level-set method is presented. It is shown that all small perturbations of the front merge into one cusp. For the flame with limited sizes it leads only to insignificant speed increase and do not permit to achieve the speed of sound. |
