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951.
Some direct relations are given between soliton solutions of integrable hierarchies and thermodynamic quantities of the Coulomb plasmas on the plane. We find that certain soliton solutions of the Kadomtsev–Petviashvili (KP) and B-type KP (BKP) hierarchies describe 2D one- or two-component lattice plasmas at special boundary conditions and fixed temperatures. It is shown that different reductions of integrable hierarchies describe pure or dipole Coulomb gases on 1D submanifolds embedded in the 2D space. 相似文献
952.
L. Gruber J.P. Holder B.R. Beck J. Steiger J.W. McDonald J. Glassman H. DeWitt D.A. Church D. Schneider 《Hyperfine Interactions》2000,127(1-4):215-222
The investigation of highly charged ion Coulomb crystallization in mixed strongly coupled plasmas is of interest in many areas:
white dwarf astrophysical plasmas are believed to have very similar thermodynamic properties, cold highly charged ions can
be used as an object for high precision laser spectroscopy of fine and hyperfine transitions in the visible due to the absence
of Doppler broadening and, an entirely new area of research is the potential application to highly charged ion based quantum
computing schemes.
We report the formation of such plasmas in a cryogenic Penning trap. These plasmas consisting of many species including Be+ and Xe44+ or Be+ and Xe15+ ions, are formed at a temperature of less than 4 K. The temperatures were obtained by applying a laser based sympathetic
cooling scheme. The determination of the temperature and density from the laser resonance width and the fluorescence imaging
of the Be+ clouds, respectively, yields a Coulomb coupling constant for the centrifugally separated Xe plasma high enough for crystallization.
A molecular dynamics code, developed just for this purpose, was run to clarify the understanding of these plasmas and it was
possible to show consistency between experiment and simulation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
953.
954.
C B Dwivedi 《Pramana》2000,55(5-6):843-848
Colloidal plasma is a distinct class of the impure plasmas with multispecies ionic composition. The distinction lies in the
phase distribution of the impurity-ion species. The ability to tailor the electrostatic interactions between these colloidal
particles provides a fertile ground for scientists to investigate the fundamental aspects of the Coulomb phase transition
behavior. The present contribution will review the basic physics of the charging mechanism of the colloidal particles as well
as the physics of the collective normal mode behavior of the general multi-ion species plasmas. Emphasis will be laid on the
clarification of the prevailing confusing ideas about distinct qualities of the various acoustic modes, which are likely to
exist in colloidal plasmas as well as in normal multi-ion species plasmas. Introductory ideas about the proposed physical
models for the Coulomb phase transition in colloidal plasma will also be discussed.
An erratum to this article is available at . 相似文献
955.
We present methods for computing a nearby partial Jordan-Schur form of a given matrix and a nearby partial Weierstrass-Schur
form of a matrix pencil. The focus is on the use and the interplay of the algorithmic building blocks – the implicitly restarted
Arnoldi method with prescribed restarts for computing an invariant subspace associated with the dominant eigenvalue, the clustering
method for grouping computed eigenvalues into numerically multiple eigenvalues and the staircase algorithm for computing the
structure revealing form of the projected problem. For matrix pencils, we present generalizations of these methods. We introduce
a new and more accurate clustering heuristic for both matrices and matrix pencils. Particular emphasis is placed on reliability
of the partial Jordan-Schur and Weierstrass-Schur methods with respect to the choice of deflation parameters connecting the
steps of the algorithm such that the errors are controlled. Finally, successful results from computational experiments conducted
on problems with known canonical structure and varying ill-conditioning are presented.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
956.
957.
利用Bathe模型,理论模拟了氩团簇在飞秒强激光中(100 fs, 1016 W/cm2)的电离和爆炸过程.研究结果显示,在团簇尺寸较小时,离子平均能量与团簇初始半径平方成正比,爆炸机制为典型的库仑爆炸.随着团簇尺寸的增加,能量增加的速度趋缓并在一定团簇尺寸后趋于饱和.模拟结果与实验数据有较好的吻合. 相似文献
958.