Issue 1/2009

UDK 539.17
SOLUTIONS TO DEGENERATED AND NEARLY DEGENERATED NEUTRON TRANSPORT EQUATION / N. B. Babichev, I. V. Lutikov, V. P. Neznamov // P. 3

General properties of eigenfuntions (EF) and eigenvalues (EV) of degenerated kinetic equation are studied. Approximate analytical solutions are derived for a homogeneous sphere of an arbitrary material in degenerated or nearly degenerated stats.

UDK 539.17
APPROXIMATE ANALYTICAL SOLUTIONS FOR MILNE’S PROBLEM IN NEUTRON TRANSPORT THEORY / N. B. Babichev, P. V. Zabusov // P. 11

Approximate analytical solutions for Milne’s problem have been determined. In contrast to known accurate solutions, approximate solutions, due to their simplicity allowed establishing various physical values dependences on arguments and parameters. This yields visual notion of neutron kinetics processes.

UDK 539.17
NEUTRON FIELD IN ABOVE-CRITICAL ACTIVE SYSTEM CONSISTING OF TWO TOUCHING SEMI-INFINITE MEDIA / N. B. Babichev, P. S. Bondarev // P. 17

Exact analytic solution for neutron distribution problem in above-critical active system consisting of two semi-infinite media contacting at flat interface have been found.

UDK 539.219.1
THERMAL DESORTION OF DEUTERIUM FROM TUNGSTEN AFTER ION IMPLANTATION / Y. M. Gasparian, C. O. Stepanov, A. A. Rusinov, N. N. Trifonov, A. A. Pisarev // P. 26

Programmed thermal desorption of deuterium from tungsten after ion implantation at room temperature was investigated in this work. Mass and energy separated molecular D₂⁺ ions with the energy of 10 keV and polycrystalline W foil 20 µm thick were used. Release of D₂, HD, HDO, and D₂O molecules containing implanted D atoms was monitored. Relation between the desorption components depends on experimental conditions and on the ion fluence. TDS consist of several peaks with the temperatures in the range T_m=400-1050 K. Features of the spectra are discussed.

UDK 532.517.4+519.63
RESULTS OF GAS DYNAMIC SIMULATIONS OF TURBULENT 2D FLOW MIXING EXPERIMENTS USING KORONA CODE / V. I. Kozlov, A. N. Razin, E. V. Shaporenko, I. Yu. Shebarshina // P. 31

Gas dynamic experiments on shock-induced turbulent mixing at interfaces of three-layer gas systems have been simulated numerically. The simulations were performed using the KORONA code with a 2D version of the modified Nikiforov model for turbulent mixing. The simulation data are compared with the experiments based on the width of turbulent mixing zones.

UDK 539.219.1
THERMAL DESORPTION COMPUTATIONAL STUDIES OF ION-IMPLANTED HYDROGEN IN TUNGSTEN / S. S. Yarko, I. V. Tsvetkov, A. A. Pisarev // P. 39

Analyzed here is the effect of various factors on the form and location of thermal desorption peak. The computations were made using hydrogen desorption by tungsten. Shown here are thermal desorption transitions between various conditions: limited either by defect releasing, or diffusion, or surface recombination. The effect of ion deceleration profile shape is shown, as well as pattern thickness, hydrogen initial concentration, binding energy with traps, and recombination activation energy. It is shown that the first order desorption model is applicable to the field of small trap concentration.

UDK 524.822, 827, 854; 521.933, 934; 530.12; 533.9
ACCELERATING EXPANSION OF THE UNIVERSE / V. V. Popov // P. 49

Considered here is the accelerating expansion of the model Universe. It is shown that cosmological red shift effect is associated with nonlinearity of time scale. The obtained effects agree with observations.
Considered here are the common principles of Lagrange and Euler coordinates transformation of solids relative to the reference system of the expanding Universe when: τ – is true scalar, с_τ=const (с – is velocity of light, τ – is time interval duration).
Given here is a number of effects. The wording of motion detection experiment as well as non-relict nature of cosmic micro-wave background hypothesis is given.

UDK 532.517.4
CONVERSION MODEL OF THE RAYLEIGH-TAYLOR INSTABILLITY / Murat D. Kamchibekov // P. 58

The model being offered describes the evolution of both single mode Rayleigh-Taylor (R-T) instability and R-T bubble and spike fronts. The results of our calculations have been compared with the findings from LEM experiments, as well as those received from the existing models.