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51.
In the asymptotic limit, the interlayer exchange coupling decays as D-2, where D is the spacer thickness. A systematic procedure for calculating the preasymptotic corrections, i.e., the terms of order D-n with ,is presented. The temperature dependence of the preasymptotic corrections is calculated. The results are used to discuss
the preasymptotic corrections for the Co/Cu/Co(001) system.
Received 7 January 1999 相似文献
52.
Q. Guo Y.P. Feng H.C. Poon C.K. Ong 《The European Physical Journal B - Condensed Matter and Complex Systems》1999,9(1):29-36
A new approach based on the invariant embedding method for the self-consistent calculation of electronic structure of quantum
wells is presented and is applied to both neutral quantum well and parabolic quantum well. Numerical results obtained for
these structures agree very well with those of previous theoretical and experiment studies. The present approach is expected
to lead to a more efficient and stable scheme for the calculation of electronic band structure of quantum structures. Realistic
boundary conditions are naturally taken into account in the present calculation which provides a convenient way for studying
boundary effects.
Received 21 September 相似文献
53.
S. Pokrant K.B. Whaley 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,6(2):255-267
We utilize a tight-binding model to study the effects of surface structure on electronic properties of CdSe clusters. The
model takes into account experimental information about structure and shape of the nanocrystals, as well as the nature and
distribution of capping ligands. The effects of both organic capping ligands and inorganic capping shells on the densities
of states (DOS) and on the single-particle absorption spectra of the clusters are calculated for various cluster shapes and
sizes, and are compared to results for clusters with truncated surfaces. For organic capping ligands, the effect of ligand
hybridization is investigated and a simple model of surface reconstruction is developed. Both ligand hybridization and surface
reconstruction are seen to have a major influence on the band edge electronic and optical properties. Inorganic capping shells
give rise to differential localization of valence and conduction band edge states, with the hole primarily confined to the
core region and the electron more evenly distributed over both core and shell.
Received 21 September 1998 / Received in final form: 15 December 1998 相似文献
54.
S. Wehrli D. Poilblanc T.M. Rice 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,23(3):345-350
We study the charge profile of a C60-FET (field effect transistor) as used in the experiments of Sch?n, Kloc and Batlogg. Using a tight-binding model, we calculate
the charge profile treating the Coulomb interaction in a mean-field approximation. At low doping, the charge profile behaves
similarly to the case of a continuous space-charge layer and becomes confined to a single interface layer for doping higher
than ∼
0.3 electron (or hole) per C60 molecule. The morahedral disorder of the C60 molecules smoothens the structure in the density of states.
Received 21 June 2001 相似文献
55.
This work reviews the different techniques proposed and used to grow ultra-thin layers by Liquid Phase Epitaxy. Some of these approaches have allowed the production of quantum-well heterostructures for optoelectronic devices with performances comparable to devices made by Molecular Beam Epitaxy or Metal Organic Chemical Vapor Deposition. 相似文献
56.
B. Tanatar N. Mutluay 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,1(4):409-417
We study the spin correlations in two- and three-dimensional electron liquids within the sum-rule version of the self-consistent
field approach of Singwi, Tosi, Land, and Sj?lander. Analytic expressions for the spin-antisymmetric static structure factor
and the corresponding local-field correction are obtained with density dependent coefficients. We calculate the spin-dependent
pair-correlation functions, paramagnon dispersion, and static spin-response function within the present model, and discuss
the spin-density wave instabilities in double-layer electron systems.
Received: 22 September 1997 / Revised: 1 December 1997 / Accepted: 4 December 1997 相似文献
57.
K. R. Sreenivasan 《Pramana》2008,70(6):959-963
I summarize here the remarks made at the closing of the Conference and Research Workshop: Perspectives on Nonlinear Dynamics,
held in Trieste in July 2007.
相似文献
58.
X. Lü J.H. Chu 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,26(3):375-378
Thermal conductivity of silicon and porous silicon nanowires based on the equation of phonon radiative transport is theoretically
evaluated. The thermal conductivities of silicon nanowires with square cross-sections are found to match molecular dynamics
simulation results reasonably well. It is shown that the results of meso-porous silicon nanowires are about two orders of
magnitude lower than that of silicon nanowires in a wide range of temperature (50 K-300 K).
Received 24 April 2001 and Received in final form 23 December 2001 相似文献
59.
M. Geddo R. Ferrini G. Guizzetti M. Patrini S. Franchi P. Frigeri G. Salviati L. Lazzarini 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,16(1):19-24
We report on a photoreflectance investigation in the 0.8-1.5 eV photon energy range and at temperatures from 80 to 300 K on
stacked layers of InAs/GaAs self-assembled quantum dots (QDs) grown by Atomic-Layer Molecular Beam Epitaxy. We observed clear
and well-resolved structures, which we attribute to the optical response of different QD families. The dependence of the ground
state transition energy on the number of stacked QD layers is investigated and discussed considering vertical coupling between
dots of the same column. It is shown that Coulomb interaction can account for the observed optical response of QD families
with different morphology coexisting in the same sample.
Received 17 November 1999 相似文献
60.
D. Lee S. Lee H. Kim D.-J. Jang 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,24(1-3):303-306
DNA-connected strings of gold nanoparticles are arranged
to form very uniformly annular arrays having various diameters
of a few micrometers by adjusting evaporation conditions as well
as the concentrations of gold nanoparticles and
phosphorothioate-modified oligonucleotides. The circles are
formed by the dry hole-opening mechanism rather than by the
Marangoni effect. However, their sizes are very diverse and
their circumferences are approaching to show single-particle
thinness instead of close-packed particle cluster thickness
owing to DNA-linked gold nanoparticle strands. 相似文献