全文获取类型
收费全文 | 2373篇 |
免费 | 70篇 |
国内免费 | 28篇 |
专业分类
化学 | 1551篇 |
晶体学 | 27篇 |
力学 | 57篇 |
数学 | 448篇 |
物理学 | 388篇 |
出版年
2023年 | 20篇 |
2022年 | 71篇 |
2021年 | 83篇 |
2020年 | 50篇 |
2019年 | 53篇 |
2018年 | 45篇 |
2017年 | 43篇 |
2016年 | 91篇 |
2015年 | 75篇 |
2014年 | 99篇 |
2013年 | 145篇 |
2012年 | 137篇 |
2011年 | 145篇 |
2010年 | 99篇 |
2009年 | 103篇 |
2008年 | 136篇 |
2007年 | 139篇 |
2006年 | 117篇 |
2005年 | 106篇 |
2004年 | 97篇 |
2003年 | 80篇 |
2002年 | 55篇 |
2001年 | 40篇 |
2000年 | 39篇 |
1999年 | 32篇 |
1998年 | 37篇 |
1997年 | 24篇 |
1996年 | 28篇 |
1995年 | 29篇 |
1994年 | 25篇 |
1993年 | 20篇 |
1992年 | 26篇 |
1991年 | 23篇 |
1990年 | 17篇 |
1989年 | 16篇 |
1988年 | 16篇 |
1987年 | 8篇 |
1986年 | 11篇 |
1985年 | 20篇 |
1984年 | 16篇 |
1983年 | 8篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 8篇 |
1976年 | 3篇 |
1974年 | 4篇 |
1966年 | 1篇 |
排序方式: 共有2471条查询结果,搜索用时 8 毫秒
41.
42.
Litak Grzegorz Margielewicz Jerzy Gąska Damian Yurchenko Daniil Dąbek Krzysztof 《Nonlinear dynamics》2020,102(4):2125-2142
Nonlinear Dynamics - This paper examines the oscillations of a spherical pendulum with horizontal Lissajous excitation. The pendulum has two degrees of freedom: a rotational angle defined in the... 相似文献
43.
44.
45.
We present a detailed study of the Schrödinger picture space of states in theSU(2) Chern-Simons topological gauge theory in the simplest geometry. The space coincides with that of the solutions of the chiral Ward identities for the WZW model. We prove that its dimension is given by E. Verlinde's formulae. 相似文献
46.
Envelopes of splines in the projective plane 总被引:2,自引:0,他引:2
In this paper a family of curvesRiemannian cubicsinthe unit sphere and the real projective plane is investigated.Riemannian cubics naturally arise as solutions to variationalproblems in Riemannian spaces. It is remarkable to find thatan envelope of lines generated by a Riemannian cubic in onespace is (nearly) a Riemannian cubic in another space. 相似文献
47.
Monika Karpierz Jan Suchanicz Krzysztof Konieczny Dorota Sitko Pascal Marchet Urszula Lewczuk 《Phase Transitions》2015,88(7):662-667
The 0.5K0.5Bi0.5TiO3–0.5PbTiO3 ceramics were prepared by following a standard solid-state method. The Raman, thermal and dielectric properties of these ceramics were investigated. The X-ray measurements showed that samples have single perovskite-type structure with tetragonal symmetry. Dielectric study revealed that the dielectric behaviour of the investigated ceramics is rather of normal ferroelectrics with large thermal hysteresis. The transition temperature observed by means of differential scanning calorimetry measurements is in good agreement with that obtained from dielectric study. 相似文献
48.
A vanishing theorem and constraints are given for the Betti numbers of compact 3-Sasakian manifolds. 相似文献
49.
We study a boundary version of the gauged WZW model with a Poisson–Lie group G as the target. The Poisson–Lie structure of G is used to define the Wess–Zumino term of the action on surfaces with boundary. We clarify the relation of the model to the topological Poisson sigma model with the dual Poisson–Lie group G
* as the target and show that the phase space of the theory on a strip is essentially the Heisenberg double of G introduced by Semenov–Tian–Shansky. 相似文献
50.
We prove that the sequence of finite reflecting branching Brownian motion forests defined by Burdzy and Le Gall ([1]) converges in probability to the “super-Brownian motion with reflecting historical paths.” This solves an open problem posed in [1], where only tightness was proved for the sequence of approximations. Several results on path behavior were proved in [1] for all subsequential limits–they obviously hold for the unique limit found in the present paper.Mathematics Subject Classification (2000): Primary 60H15, Secondary 35R60Supported in part by NSF Grant DMS-0071486, Israel Science Foundation Grants 12/98 and 116/01 - 10.0, and the U.S.-Israel Binational Science Foundation (grant No. 2000065). 相似文献