Issue 1/2012

ABSTRACTS:

UDK 532.529: 544.72: 544.772

THE CALCULATING METHOD OF RESUSPENSION BASED ON THE COMBINATION DETERMINISTIC AND STATISTICAL APPROACHES / D. V. Tsaplin, V. N. Piskunov // Р. 3
The calculating method of process repeated dust formation uniting deterministic and statistical approaches to the description of wind lift (resuspension) of immovable and rolling particles on a surface is presented. This method uses the rock’n roll model based on the statistical approach, restricting its performance by threshold diameter of particles separating the immobile particles from rolling. It is considered, that resuspension of rolling particles occurs immediately if aerodynamic lift force acting on them exceeds their weight. In calculations it is taken into account that too large and heavy particles still rolling on a surface, not taking part in resuspension. On the basis described algorithm the calculations are performed, results of these calculations good agree to experiment.

UDK 519.642.2: 532.529: 544.772

ANALYTICAL SOLUTIONS FOR COAGULATION AND CONDENSATION KINETICS OF COMPOSITE PARTICLES / V.N.Piskunov // Р. 9
The following results have been obtained for simultaneous coagulation and condensation of composite particles: equations have been set providing short (impurity integrated) information on kinetics of composite particles due to coagulation and condensation; new analytical solutions have been obtained for spectra and impurity content in particles of blend composition; results have been generalized in case of arbitrary coagulation coefficients with analytical solution of one-component problem.
It is reasonable to use the obtained solutions to verify the numerical programs for computation of kinetics of composite particles formation in problems of practical importance.

UDK 621.039.1

ON THE ISSUE OF IMPROVING NM SAFETY GUARANTEES IN NUCLEAR FUEL PROCESSING / A. V. Anisin, A. A. Anischenko, I. A. Davydov, P. V. Ermakov, S. S. Zhikharev, K. V. Zadorozhny, K. V. Ivanov, N. M. Mikiychuk, E. E. Santalova, A. I. Saifullin // Р. 15
One of the most important practical tasks of nuclear states is nuclear material safeguards in nuclear fuel reprocessing. These safeguards refer to nuclear material safety in reprocessing, continuous monitoring of processes, environmental sampling and additional measures such as policy of containment and supervision. The most important component of these safeguards is construction of computer-aided NM accounting and control system at an enterprise for nuclear fuel reprocessing. The paper provides a generalized physics and computer model describing basic features of a typical reprocessing enterprise (we chose Purex-process which is not principal). The paper presents methods of measuring nuclear materials at a typical enterprise. We constructed a flexible expandable computer model that does not require much effort to be adjusted for special features of specific enterprises.  Additional measures to protect and safe information in the enterprise model are described. The test plan was developed and tests were performed using prototype data. This model can be widely used at enterprises of nuclear materials reprocessing.

UDK 539.125.523

SOLUTION OF TRANSIENT TWO-REGION MILNE’S PROBLEM IN NEUTRON TRANSFER THEORY / N. B. Babichev, P. S. Bondarev // Р. 25
Neutron distribution function has been found in a system of two semi-infinite uniform media with a plane interface between them.

UDK 530.145; 514.764.2; 530.145.7

STATIONARY BOUND STATES OF DIRAC PARTICLES IN COLLAPSAR FIELDS / M. V. Gorbatenko, V. P. Neznamov // Р. 30
It is the first time stationary bound states of elementary spin 1/2 particles that do not decay with time are obtained for a Schwarzschild gravitational field using a self-conjugate Hamiltonian with a flat scalar product in a wide range of gravitational coupling constant. In order to obtain a discrete energy spectrum, we introduce a boundary condition such that the radial current density of Dirac particles near the “event horizon” is zero. 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 539.14.01

THE ATOMIC NUCLEUS CLUSTER MODEL AND EXITED STATES OF NUCLEI. PART I. AN EXAMPLE OF THE NUCLEUS TWO-CLUSTER MODEL OF Bе⁸ CONSTRUCTION / A. A. Sadovoy, A. S. Ulyanov // VANT. Ser.: Theoret. i prikl. fizika. 2012. N 1. Р. 34?39.
Various types of models are used in the theory of atomic nuclei to describe their excited states. In recent times, research activities of scientists are focused on the excited states, which are treated as cluster states (for example, long-lived heavy-nucleus isomers). The available cluster models have some disadvantages. For example, the well-known Brink model [1] does not allow describing the main state 0⁺ of beryllium as a quasi-steady state of two α-particles. The developed cluster model allows studying the cluster states of identical particles. For this purpose, we introduce the cluster system of coordinates by an example of the main state of Be⁸ nucleus. The paper describes an algorithm for constructing a cluster wave function and methods used to calculate the overlapping integrals using the main state of  Be⁸ as an example. Analytical calculations are carried out with the generalized functions. The method complexity stems from the non-orthogonal basis used to describe clusters.

UDK 533.6.07

TO FREE TRAJECTORY DATA RECORDING TECHNIQUE / S. I. Gerasimov, V. I. Kostin, V. A. Kikeev, M. A. Khairullin // Р. 40
To solve modern problems in experimental aeroballistics means to obtain the accurate free trajectory data as initial material for determining the aerodynamic parameters. Thereto the optical facility of aeroballistics range /1/ deals with constant toughening demands. Gradual exclusion of analogous cameras with digital ones, that is  irreversible process in modern photography, defines modernization of the optical recording facility (ORF) by changing the traditional but moral and physically outmoded wide-angle cameras AFA-41/100 with new digital ones. The possibility of using semi-professional cameras of middle level in cost and complexity (Canon EOS-IDs и Kodak DCS Pro SLR/n) is estimated below for solving the photogrammetric  free trajectory problems.  Creating a digital photogrammetric stereo-mate facility (PSMF) on the base of the cameras demanded to solve some interconnected tasks: to modernize the digital non-measurement cameras for short-distance ORF photography and to provide the certification of its technical characteristics; to adapt the cameras to be an accurate photogrammetrc instrument that means to develop methodic and software assets  for photogrammetric certification, to make metrological certification with photogrammetric test of technical characteristics; to develop ancillary equipment,  to make assembling, tooling, adjustment for checking space and angle coordinates of PSMF cameras in the system of ORF coordinates; to apply PSMF for recording free trajectory data in real aeroballistics experiments.
While creating the PSMF there were developed model of calibration facility and calibration method based on photographing  the fields of fixed signs with any camera from 4 different locations. The photogrammetric calibration and cameras certification were made. There were performed assembling, toolings, adjustment for PSMF and its approbation in systematic aeroballistics experiments. There was estimated accuracy of received free trajectory data with respect to results obtained with regular analogous system.

UDK 533.6.011

HYPERSONIC FLOW INFLUENCE ON SPHERES FROM DIFFERENT MATERIALS IN FREE FLIGHT / S. I. Gerasimov, V. A. Kikeev, V. E. Lysenkov, S. I. Oseeva, K. V. Totychev, A. P. Fomkin // Р. 52
Hypersonic flow visualization around different materials (alloys, composites) is presented. The data obtained in aeroballistics experiments show the possibility for studying the aerophysical destruction of materials in hypersonic free flight that is of interest for problem of asteroid danger.