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排序方式: 共有636条查询结果,搜索用时 609 毫秒
631.
J.L. Bubendorff C. Mény E. Beaurepaire P. Panissod J.P. Bucher 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,17(4):635-643
The crystallographic structure and morphology of electrodeposited cobalt films on Au(111) is found to be very sensitive on
the electrolyte pH value and on the overpotential applied during deposition. The samples, 2 to 500 nm thick, where characterized
by nuclear magnetic resonance (NMR), atomic force microscopy (AFM) and electron diffraction. The latter technique shows that
the Co films grow in registry with the gold underlayer, reproducing the Au(111) texture. During the first stage of growth
and depending on overpotential and pH value, either continuous hcp Co films or hcp Co islands are formed. Only the latter
growth mode leads to an out of plane magnetization with 100% of remanence. Increasing the thickness, fcc Co becomes the prevailing
phase. Eventually the fcc to hcp ratio saturates at the same value regardless the overpotential. The thickness for which the
equilibrium fcc to hcp ratio is obtained as well as the sample structure and morphology before saturation, depend strongly
on the overpotential value. In any case, the predominance of the fcc Co phase leads to an in plane magnetization of the thick
samples. This study opens up new opportunities of engineering the properties of electrodeposited cobalt films.
Received 29 February 2000 and Received in final form 3 July 2000 相似文献
632.
J. Altmann W. Brenig A.P. Kampf 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(3):429-433
We have investigated the evolution of the electronic properties of the t-t'-U Hubbard model with hole doping and temperature. Due to the shape of the Fermi surface, scattering from short wavelength spin
fluctuations leads to strongly anisotropic quasi-particle scattering rates at low temperatures near half-filling. As a consequence,
significant variations with momenta near the Fermi surface emerge for the spectral functions and the corresponding ARPES signals.
At low doping the inverse lifetime of quasiparticles on the Fermi surface is of order varying linearly in temperature from energies of order t down to a very low energy scale set by the spin fluctuation frequency while at intermediate doping a sub-linear T-dependence is observed. This behavior is possibly relevant for the interpretation of photoemission spectra in cuprate superconductors
at different hole doping levels.
Received 31 July 2000 相似文献
633.
D. Sa C. Gros 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(3):421-428
An effective intra- and inter-ladder charge-spin Hamiltonian for the quarter-filled ladder compound α'-NaV2O5 has been derived by using the standard canonical transformation method. In the derivation, it is clear that a finite inter-site
Coulomb repulsion is needed to get a meaningful result otherwise the perturbation becomes ill-defined. Various limiting cases
depending on the values of the model parameters have been analyzed in detail and the effective exchange couplings are estimated.
We find that the effective intra-ladder exchange may become ferromagnetic for the case of zig-zag charge ordering in a purely
electronic model. We estimate the magnitude of the effective inter-rung Coulomb repulsion in a ladder and find it to be about
one-order of magnitude too small in order to stabilize charge-ordering.
Received 24 March 2000 and Received in final form 30 August 2000 相似文献
634.
R. Popescu D. Macovei A. Devenyi R. Manaila P.B. Barna A. Kovacs J.L. Lábár 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,13(4):737-743
Structure of metal clusters and of the C60 matrix in Au/C60 and Cu/C60 nanosystems was investigated by X-ray diffraction. Results support a charge-transfer-type interaction at the metal-C60 interface, which affects the size distribution of metal clusters, favouring interstitial location of metal ions in the fullerite
lattice.
Received 5 February 1999 and Received in final form 7 July 1999 相似文献
635.
C.F. Kaminski X.S. Bai J. Hult A. Dreizler S. Lindenmaier L. Fuchs 《Applied physics. B, Lasers and optics》2000,71(5):711-716
High-speed planar laser-induced fluorescence (PLIF) and 3-D large eddy simulations (LES) are used to study turbulent flame
kernel growth, wrinkling and the formation of separated flame pockets in methane/air mixtures. Turbulence was effected by
a set of rotary fans situated in a cylindrical enclosure. Flame wrinkling was followed on sequential 2-D OH images captured
at kHz repetition rates. Under stoichiometric conditions and low turbulence levels the flame kernel remains singly connected
and close to spherical in shape. By increasing turbulence or reducing the stoichiometry of the mixture the formation of separated
pockets could be observed and studied. The mechanisms behind these phenomena are investigated qualitatively by LES of a level-set
G-equation describing the flame surface propagation in turbulent flows.
Received: 12 April 2000 / Revised version: 26 June 2000 / Published online: 5 October 2000 相似文献
636.
We report on metal (Cr, Ni, or Pd)-induced solid-phase crystallization (MISPC) of plasma-enhanced chemical-vapor-deposited
hydrogenated amorphous silicon at annealing temperatures ≤600 °C. MISPC is found to significantly reduce the thermal budget
of crystallization at annealing temperatures as low as ∼400 °C. The lowest achievable annealing temperature is found to depend
on the metal type. The metal type is also found to influence grain size and the conductivity of the polycrystalline silicon.
Received: 21 June 1999 / Accepted: 20 October 1999 / Published online: 23 February 2000 相似文献