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71.
V. S. Sadovskii 《Journal of Applied Mechanics and Technical Physics》1990,31(3):406-407
Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 3, pp. 71–72, May–June, 1990. 相似文献
72.
73.
74.
It is shown that the slope of the upper critical field
in superconductors with d pairing drops rapidly with increasing concentration of normal impurities, while in superconductors with anisotropic s pairing
increases and reaches the well-known asymptotic level characteristic for the isotropic case. This difference makes it possible,
in principle, to employ measurements of H
c
2 in disordered superconductors as an experimental method for determining the type of pairing in high-T
c
superconductors and systems with heavy fermions.
Pis’ma Zh. éksp. Teor. Fiz. 63, No. 5, 347–352 (10 March 1996) 相似文献
75.
E. Z. Kuchinskii M. V. Sadovskii 《Journal of Experimental and Theoretical Physics》2016,122(3):509-524
We briefly review the generalized dynamic mean-field theory DMFT+Σ applied to both repulsive and attractive disordered Hubbard models. We examine the general problem of metal–insulator transition and the phase diagram in the repulsive case, as well as the BCS–BEC crossover region of the attractive model, demonstrating a certain universality of single-electron properties under disordering in both models. We also discuss and compare the results for the density of states and dynamic conductivity in the repulsive and attractive cases and the generalized Anderson theorem behavior of the superconducting critical temperature in the disordered attractive case. A brief discussion of the behavior of Ginzburg–Landau coefficients under disordering in the BCS–BEC crossover region is also presented. 相似文献
76.
77.
We report LDA calculated band structure, densities of states and Fermi surfaces for recently discovered Pt-pnictide superconductors APt3P (A = Ca, Sr, La), confirming their multiple band nature. Electronic structure is essentially three dimensional, in contrast to Fe pnictides and chalcogenides. LDA calculated Sommerfeld coefficient agrees rather well with experimental data, leaving little space for very strong coupling super-conductivity, suggested by experimental data on specific heat of SrPt3P. Elementary estimates show, that the values of critical temperature can be explained by rather weak or moderately strong coupling, while the decrease in superconducting transition temperature T c from Sr to La compound can be explained by corresponding decrease in total density of states at the Fermi level N(E F). The shape of the density of states near the Fermi level suggests that in SrPt3P electron doping (such as replacement Sr by La) decreases N(E F) and T c , while hole doping (e.g., partial replacement of Sr with K, Rb or Cs, if possible) would increase N(E F) and possibly T c . 相似文献
78.
We present a consistent way of treating a double counting problem unavoidably arising within the LDA + DMFT combined approach
to realistic calculations of electronic structure of strongly correlated systems. The main obstacle here is the absence of
systematic (e.g., diagrammatic) way to express LDA (local density approximation) contribution to exchange correlation energy
appearing in the density functional theory. It is not clear then, which part of interaction entering DMFT (dynamical mean-field
theory) is already taken into account through LDA calculations. Because of that, up to now there is no accepted unique expression
for the double counting correction in LDA + DMFT. To avoid this problem we propose here the consistent LDA’ + DMFT approach,
where LDA exchange correlation contribution is explicitly excluded for correlated states (bands) during self-consistent band
structure calculations. What is left out of Coulomb interaction for those strongly correlated states (bands) is its non-local
part, which is not included in DMFT, and the local Hartreelike contribution. Then the double counting correction is uniquely
reduced to the local Hartree contribution. Correlations for strongly correlated states are then directly accounted for via
the standard DMFT. We further test the consistent LDA’ + DMFT scheme and compare it with conventional LDA + DMFT calculating
the electronic structure of NiO. Opposite to the conventional LDA + DMFT our consistent LDA’ + DMFT approach unambiguously
produces the insulating band structure in agreement with experiments. 相似文献
79.
A. A. Airapetov L. B. Begrambekov S. V. Vergazov A. E. Evsin A. S. Kaplevskii Ya. A. Sadovskii P. A. Shigin 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(6):708-711
Experiments are performed to study particle trapping in a graphitized carbon composite upon its exposure to a flux of deuterium atoms. It is shown that irradiation by deuterium atoms with thermal velocities ensures trapping according to a potential mechanism: atoms of the irradiating flux and hydrogen atoms from a layer of water molecules sorbed on the surface are both trapped. Mechanisms of trapping are discussed. Based on the experimental results, the contribution to deuterium-atom trapping in CFC irradiated in deuterium plasma is determined for each component-ions, electrons, and atoms. 相似文献
80.