The influence of Coulomb attraction in the electron-hole pair on luminescence of phosphor crystals with traps
The influence of Coulomb attraction in the electron-hole pair on luminescence of phosphor crystals with traps
A.N. Vasil'ev$^1$, A.V. Nesterov$^2$
Within the two-channel model of recombination luminescence, the dependence of recombination parameters on the initial distance between the electron-hole pair components was obtained. Taking into account Coulomb attraction in the electron-hole pair, the quantum yield and the recombination rate were calculated. The suggested model was shown to introduce substantial corrections into the results of calculations based on the model of a "black sphere" with a radius equal to the Onsager radius.
Show AbstractTwo-wavelength solid-state laser with spatial wave separation
Two-wavelength solid-state laser with spatial wave separation
V.G. Voronin, O.E. Nanii
A two-wavelength solid-state YAG:Nd$^{3+}$ laser generating radiation at wavelengths of 1.32 and 1.05 μm has been experimentally implemented and investigated. Weakening the competition between the waves generated in a specially designed dispersive cavity has improved the stability of two-wavelength generation mode.
Show AbstractDensity pulsations in turbulent flow in front of and behind a shock wave
Density pulsations in turbulent flow in front of and behind a shock wave
O.A. Azarova, E.A. Bratinkova, L.S. Shtemenko, F.V. Shugaev, V.E. Yanitskii
The density pulsations in front of and behind a shock wave in a turbulent gas have been studied experimentally and theoretically. The pulsations growth coefficient has been measured and calculated, the change in the pulsations correlation coefficient upon the transition over the shock wave front determined, and the turbulence scale for different shock wave Mach numbers evaluated. The experiments have been carried out in a shock tube, the flow has been turbulized using a net. Turbulence is modeled by a sequence of velocity pulses. The experimental and calculated data are in close agreement.
Show AbstractFormula for series resistance of a solar cell with a conducting antireflection coating
Formula for series resistance of a solar cell with a conducting antireflection coating
G.G. Untila, A.S. Osipov, A.B. Chebotareva
An analytic expression for the effective series resistance of an $(n^+$-$p)$Si solar cell with an antireflection coating made of an optically transparent conducting oxide such as indium-tin oxide (ITO) is derived. The obtained expression is the resistance dependence on the solar cell parameters, namely, the ITO film and the $n^+$-layer resistances, the contact resistance between the $n^+$-layer and ITO, the width of metallic bands in the current-collecting grid, and on the interband distance.
Show AbstractFair weather field over continents and oceans. Tidal electric fields over the Earth's surface
Fair weather field over continents and oceans. Tidal electric fields over the Earth's surface
V.I. Grigor'ev, V.S. Rostovskii
It is shown that the interpretation of the geoelectric field as a result of baroelectric redistribution of charges in the Earth caused by tidal effects makes it possible to explain the difference in time dependence of the fair weather field over continents and oceans.
Show AbstractВозможности исследования корреляций атомных электронов в экспериментах по двухкратной ионизации электронным ударом
Возможности исследования корреляций атомных электронов в экспериментах по двухкратной ионизации электронным ударом
Ю.В. Попов, К.А. Кузаков
Исследуется поведение дифференциальных сечений реакции A$(e,3e)$A$^{++}$ в гелии в зависимости от типа волновой функции атома. Теоретические расчеты этих сечений показали, что на основании угловых спектров $(e,3e)$ экспериментов можно делать по крайней мере качественные заключения о характере межэлектронных корреляций в волновой функции мишени.
Show AbstractРасчет скорости совпадений и одиночных фотоотсчетов при регистрации излучения невырожденного параметрического рассеяния
Расчет скорости совпадений и одиночных фотоотсчетов при регистрации излучения невырожденного параметрического рассеяния
А.В. Белинский
Описан численный эксперимент - приготовление и регистрация фотонных пар, интересный с точки зрения пpовеpки возможности описания квантовых процессов в рамках классической статистической физики - теории скрытых переменных - методом тестирования неравенств Белла. Получены аналитические формулы и проведены компьютерные расчеты для скоростей парных и одиночных фотоотсчетов, которые показали, что отношение скоpости паpных к скоpости одиночных может быть очень близким к квантовой эффективности детекторов $\eta$. Этот pезультат подтвеpждает принципиальную возможность опровержения теории скрытых переменных на основании теоремы Белла.
Show AbstractStatistical thermodynamics of nonspherical molecules systems
Statistical thermodynamics of nonspherical molecules systems
P.N. Nikolayev
An analytical expression has been obtained for the free energy of nonspherical molecnles systems in a solid-state approximation on the basis of an asymptotic expansion method. This expression makes it possible to identify thermodynamic characteristics, which are in good agreement with the experimental data for binary molecules and with the numerical experiment data within the limits of their accuracy.
Show AbstractCalculation of waveguide systems by parabolic correction and spectrum restriction methods
Calculation of waveguide systems by parabolic correction and spectrum restriction methods
A.N. Bogolyubov, M.E. Sukhov
The parabolic correction method and the method of spectrum restriction with spectral band isolation are used to construct stable numerical algorithms for calculating waveguide systems of superhigh-frequency electrodynamics and of integral and fiber optics. Examples of numerical calculations have been given.
Show AbstractEvolution of unstable magnetic field configurations in mean-field dynamo problem in a turbulent medium
Evolution of unstable magnetic field configurations in mean-field dynamo problem in a turbulent medium
A.A. Bykov, V.Yu. Popov
Approximate formulas for the drift velocity of a transition layer and for the lifetime of a nonstationary contrast structure in the problem of magnetic field generation in a turbulent medium have been derived.
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