Hydrogen atom in discrete space-time
Hydrogen atom in discrete space-time
V.V. Kislov
A generalization of the well-known Snyder apprpach to quantum space is developed. The problem of the hydrogen atom in discrete space is considered. Energy-level values of a hydrogen-like atom with characteristic corrections required by the discreteness of space are obtained.
Show AbstractMechanism of the formation of a riparian current in forward channel flow
Mechanism of the formation of a riparian current in forward channel flow
O.N. Mel'nikova, G.G. Khundzhua
The results of experimental investigation of the flow-velocity field in the region of an autonomous riparian current usually existing in forward channel flows are presented. A physical model of the formation of the liquid boundary separating the riparian current from the basic flow is proposed.
Show AbstractKinetic effects in Ni-Cu alloys
Kinetic effects in Ni-Cu alloys
R.P. Vasil'eva, A.V. Cheremushkina
The Hall and Nernst-Ettinghausen effects and the electrical resistivity in nickel and cupronickel alloys with a Cu concentration of 4.6-30 wt.% are investigated in the temperature range from 78 K to the Curie temperature. On the basis of the data obtained on the magnitude and sign of the anomalous Hall and Nernst-Ettinghausen constants, the basic type of carriers of the anomalous Hall current in the alloys is determined. It is shown that variation in the given effects with concentration is associated with the state density of the d band.
Show AbstractSpinodal and equation of state of liquids in the region of reduced stability
Spinodal and equation of state of liquids in the region of reduced stability
L.P. Filippov
On the basis of the analysis of experimental data, the equations of a binodal $\omega=\pm B\theta^{0,323}+(B-1)\theta$ and a spinodal $\omega=\pm B \frac{2-l}{l}\theta^{0,323}+(B-1)\theta$ are obtained, where $\omega=\rho/\rho_k-1,\theta=1-T/T_k$; the plus sign refers to the liquid branch and the minus sign to the vapor branch. The value of l is universal and close to 1.20; B is an individual characteristic. New variables characterizing the remoteness of the state of the material at temperature T and density $\rho$ relative to the spinodal and the "rectilinear-diameter" line, $\omega = (B-1)\theta$, are introduced. In the new variables $\tau = \frac{l}{2-l}[\omega+(B-1)\tau], X=\tau+|Y|^{1/0,323}$ where $\tau=-\theta$, the spinodal converts to the axis Y, the "rectilineardiameter" line to the axis X; the binodal and critical isotherm are shown by symmetric curves. For the region adjacent to the spinodal, an equation of state is proposed: $\pi-\pi_c = \Pi YX^{1,26}$, where $\pi=\rho/\rho_k$; $\pi_c$ is the reduced pressure at the spinodal (for $\theta>0$) or the pressure at Y = 0 (for $\theta<0$). This equation describes the singularity of the compressibility at the spinodal and at the critical point, and ensures the calculation of the PVT relations in the metastable region, at the binodal, and in the adjacent regions of state.
Show AbstractTemperature relaxation of electron-stimulated cathode luminescence of GaN:Zn
Temperature relaxation of electron-stimulated cathode luminescence of GaN:Zn
G.A. Perlovskii, S.K. Obyden, G.V. Saparin, S.I. Popov
The temperature relaxation of stimulated local cathode luminescence in GaN:Zn is investigated. Two rates of relaxation are observed. The two relaxation times and the corresponding activation energies are found. The storage time of the activated state in the temperature range 0-l00°C is estimated.
Show AbstractCreation of an electron-positron pair by a neutrino in a constant external field
Creation of an electron-positron pair by a neutrino in a constant external field
M.Yu. Knizhnikov, A.V. Tatarintsev
In the low-energy approximation of the Weinberg-Salam model, an accurate expression is obtained for the probability of electron-positron pair formation by a neutrino in a constant crossed field. Asymptotes are obtained for the case of high and low initial neutrino energies.
Show AbstractStructure and composition of Gd-Fe films obtained in a discharge with oscillating electrons
Structure and composition of Gd-Fe films obtained in a discharge with oscillating electrons
G.V. Smirnitskaya, E.M. Reikhrudel, N.N. Kononkova
The structure and chemical composition of Gd-Fe films obtained in a discharge with oscillating electrons in Kr are investigated. The films are of thickness 0.6-5.5 μm. It is shown that films applied in plasma discharge conditions ($\rho_{Kr}=5\cdot 10^{-4}$ mm Hg) are amorphous, whereas films obtained in low-pressure discharge conditions ($\rho_{Kr}=2\cdot 10^{-4}$ mm Hg) are amorphous-crystalline, with crystalline oxide inclusions. The change in structure and chemical composition of the films on prolonged storage in the atmosphere is investigated.
Show AbstractSonic beams of finite amplitude
Sonic beams of finite amplitude
V.G. Andreev, A.A. Karabutov, O.V. Rudenko
The form of the ultrasonic waves of finite amplitude in a bounded beam is investigated experimentally. Asymmetric distortion of the compression and rarefaction phases due to diffractional divergence of the wave is observed. The variation in degree of asymmetry of the profile with distance is found to be nonmonotonic. The wave profiles recorded practically coincide with those obtained earlier by numerical calculation.
Show AbstractConvective mechanism of the appearance of currents
Convective mechanism of the appearance of currents
V.V. Alekseev, A.S. Knyazkov
Experimental results on the formation of currents in an annular rotating cuvette heated from below are given. It is shown that vertical convective cycles induce horizontal flow along the axis of the annular cuvette. Trajectories of the motion of liquid particles are constructed for two rates of rotation. The results of the investigation are of interest for an understanding of the mechanisms of current flow in geophysical processes.
Show AbstractResonant photoionization of helium in the region between the second and third thresholds
Resonant photoionization of helium in the region between the second and third thresholds
S.M. Burkov, S.I. Strakhova
The total and partial cross sections of resonant photoionization of helium in the region between the second and third thresholds are calculated using the method of interacting configurations in complex-number representation. In the calculation, account is taken of the interaction of four configurations of open channels and 20 configurations of closed channels. The curves and characteristics of the resonances obtained are compared, where possible, with existing experimental data.
Show Abstract