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排序方式: 共有96条查询结果,搜索用时 437 毫秒
1.
Bulanyi M. F. Gorban' A. A. Kovalenko A. V. Polezhaev B. A. Prokof'ev T. A. Khmelenko O. V. 《Russian Physics Journal》2002,45(12):1215-1219
The photoluminescence spectra of ZnS : Mn plastically deformed single crystals are investigated. It is established that the plastic strain causes the relative concentrations of individual manganese emission centers to change together with conditions of excitation of the centers whose nearest environment has been rearranged upon plastic strain. 相似文献
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T.?A.?Prokof’evEmail author B.?A.?Polezhaev A.?V.?Kovalenko 《Journal of Applied Spectroscopy》2005,72(6):865-871
The mechanisms of photoluminescence excitation of Mn2+ ions in ZnS crystals have been investigated on the basis of complex analysis of the temperature dependences of the photoluminescence
and photoluminescence-excitation spectra of ZnS:Mn crystals. The activation energy of a manganese luminescence center was
estimated at Ea = 0.17 ± 0.05 eV. It is shown that Ea represents an energy band with a width ΔEa = 0.1 eV, within which a manganese luminescence center can experience radiationless recombination.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 788–793, November–December, 2005. 相似文献
6.
V. V. Randoshkin V. A. Polezhaev N. N. Sysoev Yu. N. Sazhin 《Physics of the Solid State》2003,45(3):513-518
The dependence of the domain-wall velocity V on the acting magnetic field H is investigated for (Bi,Yb)3(Fe,Ga)5O12 garnet ferrite single-crystal films in the vicinity of the angular momentum compensation point at different temperatures. The films are grown by liquid-phase epitaxy from a supercooled solution melt on Cd3Ga5O12 substrates with the (111) orientation. It is demonstrated that, in these films, the precessional mechanism is not responsible for the motion of domain walls but there arises an internal effective magnetic field that weakens the acting magnetic field. 相似文献
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The development of two-dimensional thermo-gravitational convection in an elongated horizontal layer bounded by solid surfaces with the bottom instantaneously heated is investigated. The characteristics of the transition from the heat conduction regime to the convective regime are considered. The flow pattern and the heat transfer properties are described from the initial instant, which corresponds to the isothermal fluid at rest, up to the attainment of the steady-state roll-convection regime. A criterial dependence between the Rayleigh number and the nondimensional time of onset of the influence of thermo-gravitational convection on heat transfer is obtained. 相似文献
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A mathematical model and numerical method are developed and used to investigate nonstationary flow and heat and mass transfer regimes in a melt appropriate to the conditions of Czochralski crystal growth. A study is made of the separate and combined influence of rotation and thermal, concentration, and thermocapillary convection on the distribution of the temperature and the dopant in the range of regime parameters corresponding to large charging masses of the melt with small value of the kinematic viscosity. Large-scale fluctuations are found to occur when rotation and thermal convection interact. Thermocapillary convection is shown to have an important influence on the resulting motion when it interacts with the thermal and concentration forms of convection. A comparison is made with the results of experimental and theoretical investigations of other authors.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 55–65, January–February, 1981. 相似文献
9.
B. A. Polezhaev T. A. Prokof’ev A. V. Kovalenko M. F. Bulanyi 《Journal of Applied Spectroscopy》2006,73(5):707-713
By means of comprehensive analysis of the temperature dependences of the photoluminescence for ZnS:Mn crystals, we have observed
persistent changes in the intensity, shape, and position of the maximum in the emission spectrum associated with changes in
the immediate environment of the manganese luminescence centers. We have also observed inflection points on the voltage vs.
brightness characteristics of the samples, the position of which depends on the frequency of the exciting voltage and the
temperature. The observed dependences are explained using concepts describing the mechanisms of pre-breakdown luminescence.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 5, pp. 631–636, September–October, 2006. 相似文献
10.
Thermal convection in an elongated parallelepiped is considered in the case when different temperatures are maintained on the short faces while the other faces are thermally insulated. On the basis of a stability analysis of the main flow in an infinite channel and of the numerical solution of the three-dimensional Navier-Stokes equations in the Boussinesq approximation in a closed channel, the spatial convection structure is studied as a function of the Grashof number, the length, and the width of the domain.Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 28–37, July–August, 1996. 相似文献