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1.
MENG Jian REN Yu-Fang LI Xiao-GuangLaboratory of Rare Earth Chemistry Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin ChinaPopov V.V. Repin S.M. Smirnov LA. loffe Physicotechnical Institute Russian Academy of Sciences Saint Petersburg Russia 《中国化学》1994,12(5):419-424
YBa2Cu3-xVxO7-y(x=0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) superconductors have been prepared. X-ray diffraction shows that the system remains orthorhombic for all compositions studied, but for x > 0.4 V2O5 was detected as an impurity phase. Substitution of V5+ for Cu2+ occurs in the Cu(2) sites on the Cu(2)-O planes. The introduction of the high valence element, vanadium, produces the extra free-electrons. These electrons recombine with the positive carrier of the system. It makes depression of the mobility and the Hall number of YBa2Cu3-xVxO7-v and also results in a depression of TC. 相似文献
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Chairman of the International Organizing Committee of the Conference Slobodan Ani? Chairman of the Program Committee Ankica Anti?-Iovanovi? Vice-Chairman of the Local Organizing Committee ?eljko ?hupi? Deputy Editor-in-Chief of the Russian Journal of Physical Chemistry N.F. Stepanov 《Acoustical Physics》2009,55(3):451-452
Acoustical Physics - 相似文献
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Russian Text Ignored Russian Text Ignored 《等离子体物理论文集》1977,17(6):353-361
The parametric excitation of longitudinal waves in an infinite homogeneous plasma by a pump field E (t) = E 0(t) sin (ω0t + φ(t)) is studied on the basis of the Vlasov equation, where the amplitude E 0(t) and the phase φ(t) are slowly varying compared with ω0 periodic functions. Firstly it is assumed that ω0 is much larger than the electron plasma frequency ωLe. In the second part the parametric instabilities are considered under the resonance condition ω0 ≈ ωLe. In both parts the threshold fields for the excitation of the longitudinal waves and their growth rates are calculated. As an example these values are analysed for both a sequence of pump impulses and a phase-moduated pump field. They are compared with the results received for a monochromatic pump field. 相似文献
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Russian Text Ignored 《等离子体物理论文集》1978,18(1):51-56
The plasmon turbulence parametrically excited by two strong external waves with a frequency difference close to twice the electron plasma frequency is investigated in underdense plasmas. The nonlinear stabilization of the growing plasmons due to scattering by ions is described by a nonlinear integro-differential equation for the spectral plasmon energy density. The dependence of the turbulent relaxation of the plasmon energy and its stationary level on the parameters of the plasma and the pump waves is given by analytical and numerical solutions of this equation. 相似文献
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Russian Text Ignored 《等离子体物理论文集》1978,18(6):393-410
A nonlinear theory of the interaction of an external pump field with ion-acoustic and h.f. surface waves in a plasma layer with inhomogeneous boundary regions is presented for the case, when the pump field frequency is less than the electron plasma frequency. The evolution of the parametrically excited turbulence and its stationary state are both analytically treated and numerically demonstrated. Dependent on the pump field strength, two mechanisms are to be distinguished: (i) nonlinear generation of damped ion-acoustic harmonics, (ii) cascade excitation of secondary eigenmodes by growing surface oscillations. At only slight overthreshold values, mechanism (i) is responsible for the occurence of the steady state, whereas, for higher pump field strength, the wave amplitudes as well as their saturated levels are mainly determined by mechanism (ii). 相似文献
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Russian Text Ignored. 《Mathematische Nachrichten》1985,121(1):231-268
This paper will present some results on quasivariational inequality {C, E, P, Φ} in topological linear locally convex Hausdorff spaces. We shall be concerning with quasivariational inequalities defined on subsets which are convexe closed, or only closed. The compactness of the subset C is replaced by the condensing property of the mapping E. Further, we also obtain some results for quasivariational inequality {C, E, P, Φ}, where the multivalued mapping E maps C into 2X and satisfies a general inward boundary condition. 相似文献