全文获取类型
收费全文 | 297319篇 |
免费 | 1982篇 |
国内免费 | 610篇 |
专业分类
化学 | 133834篇 |
晶体学 | 4663篇 |
力学 | 15882篇 |
综合类 | 5篇 |
数学 | 45780篇 |
物理学 | 99747篇 |
出版年
2021年 | 1658篇 |
2020年 | 1797篇 |
2019年 | 2003篇 |
2018年 | 10898篇 |
2017年 | 11683篇 |
2016年 | 7570篇 |
2015年 | 3107篇 |
2014年 | 3734篇 |
2013年 | 9210篇 |
2012年 | 11352篇 |
2011年 | 20530篇 |
2010年 | 12927篇 |
2009年 | 12880篇 |
2008年 | 18050篇 |
2007年 | 21589篇 |
2006年 | 7922篇 |
2005年 | 13450篇 |
2004年 | 9685篇 |
2003年 | 8938篇 |
2002年 | 6870篇 |
2001年 | 6572篇 |
2000年 | 5230篇 |
1999年 | 3832篇 |
1998年 | 3082篇 |
1997年 | 3069篇 |
1996年 | 2965篇 |
1995年 | 2712篇 |
1994年 | 2553篇 |
1993年 | 2412篇 |
1992年 | 2759篇 |
1991年 | 2737篇 |
1990年 | 2669篇 |
1989年 | 2477篇 |
1988年 | 2536篇 |
1987年 | 2531篇 |
1986年 | 2356篇 |
1985年 | 3051篇 |
1984年 | 3316篇 |
1983年 | 2717篇 |
1982年 | 2885篇 |
1981年 | 2863篇 |
1980年 | 2714篇 |
1979年 | 2819篇 |
1978年 | 2925篇 |
1977年 | 2850篇 |
1976年 | 2950篇 |
1975年 | 2717篇 |
1974年 | 2691篇 |
1973年 | 2857篇 |
1972年 | 1794篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
N. B. Voznesensky E. V. Gavrilov A. P. Zhevlakov V. K. Kirillovskiĭ P. V. Orlov 《Technical Physics》2007,52(2):271-275
Methods and schemes to inspect the EUV mirror shape are developed on the basis of a point diffraction interferometer with computer processing of interferograms. A measurement accuracy to within 0.001 of a wavelength in the visual range is achieved. 相似文献
992.
A. D. Krisch 《The European Physical Journal A - Hadrons and Nuclei》2007,31(4):417-423
There will be a review of the history of polarized proton beams, and a discussion of the unexpected and still unexplained
large transverse spin effects found in several high-energy proton-proton spin experiments at the ZGS, AGS and Fermilab. Next,
there will be a discussion of present and possible future experiments on the violent elastic collisions of polarized protons
at IHEP-Protvino's 70GeV U-70 accelerator in Russia and the new high-intensity 50GeV J-PARC facility being built at Tokai
in Japan. 相似文献
993.
M. D. Guay 《Acta Mathematica Hungarica》2004,105(3):241-248
Axioms are given for a preconvexity space and certain consequences obtained. In particular, it is shown that in a very natural
way, a preconvexity on a space yields an abstract convexity space in much the same manner as a proximity yields a topological
space.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
994.
In this note we make a correction in the paper [1] by two of the authors. Specifically we modify an auxiliary localization
result and prove that the applications to the saturation theory of some outstanding conservative operators remain valid. Moreover,
we enrich a corollary dealing with the well-known Szász-Mirakjan operators.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
995.
P. Danchev 《Lithuanian Mathematical Journal》2007,47(2):129-134
We prove the following theorem: Any abelian p-group is an n-Σ-group which is a strong ω-elongation of a totally projective group by a p
ω+n
-projective group precisely when it is totally projective. In particular, each p-torsion p
ω+n
-projective n-Σ-group is a direct sum of countable p-groups of length not exceeding ω + n and vice versa. These two claims generalize our recent results in [6] and [7].
Published in Lietuvos Matematikos Rinkinys, Vol. 47, No. 2, pp. 155–162, April–June, 2007. 相似文献
996.
Motivated by the central limit problem for convex bodies, we study normal approximation of linear functionals of high-dimensional
random vectors with various types of symmetries. In particular, we obtain results for distributions which are coordinatewise
symmetric, uniform in a regular simplex, or spherically symmetric. Our proofs are based on Stein’s method of exchangeable
pairs; as far as we know, this approach has not previously been used in convex geometry. The spherically symmetric case is
treated by a variation of Stein’s method which is adapted for continuous symmetries.
This work was done while at Stanford University. 相似文献
997.
Sans résumé
相似文献
相似文献
998.
999.
S. M. Natanzon 《Proceedings of the Steklov Institute of Mathematics》2007,259(1):137-148
We prove that the quaternionic miniversal deformations of an A
n singularity have the structure of a noncommutative Frobenius manifold in the sense of the extended cohomological field theory. 相似文献
1000.
Runge–Kutta based convolution quadrature methods for abstract, well-posed, linear, and homogeneous Volterra equations, non
necessarily of sectorial type, are developed. A general representation of the numerical solution in terms of the continuous
one is given. The error and stability analysis is based on this representation, which, for the particular case of the backward
Euler method, also shows that the numerical solution inherits some interesting qualitative properties, such as positivity,
of the exact solution. Numerical illustrations are provided. 相似文献