Effects of mechanical pressure on potassium tantalate UHF dielectric resonators
Effects of mechanical pressure on potassium tantalate UHF dielectric resonators
G.V. Belokopytov, I.V. Ivanov, N.E. Lebedev, A.A. Kharin
A study has been made of the effects of uniaxial mechanical pressure on the dielectric constant and dielectric loss of $KTaO_3$ crystals at 4.2 К over the range 0.5-1.28 GHz. As the pressure increases, the resonant frequency of the $H_{01\delta}$ mode in a cylindrical resonator decreases monotonically. There is a considerable increase in the dielectric loss in $KTaO_3$ when an inhomogeneous pressure is applied. This agrees with the view that charged line defects (dislocations) multiply in $KTaO_3$ crystals under pressure.
Show AbstractA metal-insulator resonator in a three-circuit frequency-stabilization system
A metal-insulator resonator in a three-circuit frequency-stabilization system
I.I. Minakova, B.G. Simeonova (Bulgaria)
Results are presented on a UHF oscillator stabilized by a metal-dielectric resonator. Frequency-response curves and quality-factor data are given for the resonator modes and the stabilization coefficients at room temperature.
Show AbstractTheory of orientational self-focussing in a light wave of ordinary type
Theory of orientational self-focussing in a light wave of ordinary type
A.S. Zolot'ko, V.F. Kitaeva, N.N. Sobolev, A.P. Sukhorukov
A theoretical study is made of the interaction between the director for a homeotropically oriented nematic liquid crystal and a light wave of ordinary type at inclined incidence. Various methods are employed to calculate the director-reorientation threshold in response to a plane wave and a bounded beam. An oscillatory state is detected from the numerical solution of the equations describing the director reorientation within the framework of a simple model.
Show AbstractAn automated laser system for examining nonlinear molecular absorption
An automated laser system for examining nonlinear molecular absorption
M.S. Dzhidzhoev, A.V. Chugunov
A laser system is described that has an automated recording system and is used for examining processes in molecular gases under conditions of IR-IR and UV excitation.
Show AbstractA spin stabilizer containing $^{129}Хе$ nuclei oriented by exchange interaction
A spin stabilizer containing $^{129}Хе$ nuclei oriented by exchange interaction
Z.B. Iskandarov, L.S. Kornienko, A.L. Kotkin, R.M. Umarkhodzhaev
Experimental studies have been performed on a $^{129}Хе$ stabilizer, with the nuclei polarized by exchange interaction with potically oriented $^{133}Cs$ atoms. This spin stabilizer based on oriented $^{129}Хе$ operates with magnetic fields of 5-500 nT.
Show AbstractEnergy dependence of the direct-photoionization polarization and correlation characteristics for the 3P state of the sodium atom
Energy dependence of the direct-photoionization polarization and correlation characteristics for the 3P state of the sodium atom
V.V. Balashov, A.N. Grum-Grzhimailo, B. Zhadamba (Mongolia)
A theoretical study is made of photoionization for excited states of the sodium atom $1s^22s^22p^23p^2P_J$ at energies up to 3 Rу. The energy dependence of the parameters completely describing the process has been derived. The photoabsorption cross section, the polarization, and the angular distributions of the photoelectrons are examined for conditions characteristic of current experiments.
Show AbstractPolarization effects in the propagation of magnetoelastic waves in hematite
Polarization effects in the propagation of magnetoelastic waves in hematite
T.A. Mamatova, V.G. Prokoshev
Studies have been made on the effects of the magnitude and direction of an external magnetic fied in the frequency range 10-45 MHz on the polarization, damping, and velocity of magnetoelastic waves in hematite. It is found that the damping is strongly dependent on frequency for field strengths less than 2 kOe. When the field is reduced from 4 kOe to 0.05 kOe, the velocity is reduced by more than 40%. It has been shown by experiment that one can rotate the shear-wave's plane of polarization through 90° by altering the field strength and direction.
Show AbstractTernary correlations in liquids
Ternary correlations in liquids
P.V. Elyutin
Determining the three-particle distribution $g_3$ is considered for an equilibrium system in which the particles interact via a pair potential. The form of $g_3$ is determined from a variational principle for the free energy by the use of the second equation in the BBHCI chain to provide additional conditions in conjunction with the correlation-attenuation principle. A study is made of the behavior of $g_3$ in configurations near the most likely one; this agrees with published data from computer experiments and virial expansion.
Show AbstractDescribing the properties of a substance in a wide range around the critical point
Describing the properties of a substance in a wide range around the critical point
L.P. Filippov
It is shown that one can use variables characterizing the distance of a point in the $\rho T$ diagram from the spinodal and the symmetry line to obtain a phase diagram that is the same for different substances. In this diagram, segments of straight lines represent the spinodal, binodal, critical isotherm, and symmetry line. These variables also enable one to formulate a simple equation of state for a wide region around the critical point.
Show AbstractThe effects of oxygen on electron transport in green-leaf photosynthetic apparatus
The effects of oxygen on electron transport in green-leaf photosynthetic apparatus
A. Vasaros (Hungary), M.K. Solntsev, A.K. Kukushkin, V.A. Karavaev
Oxygen has an effect on green-leaf thermoluminescence. The strengths of the peaks apart from the A one are dependent on the environment $O_2$ concentration. The sum of the B and С peaks falls to zero in the absence of $O_2$. To produce these peaks requires the presence of oxygen only during the heating. There is assumed to be negative feedback between the oxygen producing system and the $O_2$ concentration.
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