全文获取类型
收费全文 | 19765篇 |
免费 | 2208篇 |
国内免费 | 2029篇 |
专业分类
化学 | 2211篇 |
晶体学 | 30篇 |
力学 | 1720篇 |
综合类 | 502篇 |
数学 | 13698篇 |
物理学 | 5841篇 |
出版年
2024年 | 20篇 |
2023年 | 157篇 |
2022年 | 244篇 |
2021年 | 351篇 |
2020年 | 402篇 |
2019年 | 420篇 |
2018年 | 435篇 |
2017年 | 565篇 |
2016年 | 638篇 |
2015年 | 489篇 |
2014年 | 1005篇 |
2013年 | 1270篇 |
2012年 | 1042篇 |
2011年 | 1251篇 |
2010年 | 1126篇 |
2009年 | 1379篇 |
2008年 | 1351篇 |
2007年 | 1437篇 |
2006年 | 1286篇 |
2005年 | 1218篇 |
2004年 | 1000篇 |
2003年 | 912篇 |
2002年 | 763篇 |
2001年 | 707篇 |
2000年 | 651篇 |
1999年 | 561篇 |
1998年 | 508篇 |
1997年 | 479篇 |
1996年 | 346篇 |
1995年 | 286篇 |
1994年 | 237篇 |
1993年 | 180篇 |
1992年 | 152篇 |
1991年 | 125篇 |
1990年 | 136篇 |
1989年 | 91篇 |
1988年 | 85篇 |
1987年 | 75篇 |
1986年 | 67篇 |
1985年 | 81篇 |
1984年 | 66篇 |
1983年 | 46篇 |
1982年 | 63篇 |
1981年 | 59篇 |
1980年 | 38篇 |
1979年 | 34篇 |
1978年 | 31篇 |
1977年 | 26篇 |
1976年 | 30篇 |
1973年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
141.
We show that functions which are invariant for suitable product semigroups (one of which is a quasi-Poisson semigroup on a general state space) decompose into a singular eigen-function and a mixture of products of minimal eigen-functions. 相似文献
142.
Let Um be an m×m Haar unitary matrix and U[m,n] be its n×n truncation. In this paper the large deviation is proven for the empirical eigenvalue density of U[m,n] as m/n→λ and n→∞. The rate function and the limit distribution are given explicitly. U[m,n] is the random matrix model of quq, where u is a Haar unitary in a finite von Neumann algebra, q is a certain projection and they are free. The limit distribution coincides with the Brown measure of the operator quq. 相似文献
143.
144.
We prove that all invariant distances on the universal Teichmuller space agree and are determined by the Grunsky coefficients of the naturally related conformal maps. This fact yields various important consequences; in particular, we obtain solutions of certain well-known geometric problems in complex analysis and related fields. 相似文献
145.
146.
本文讨论了复调和函数在无穷远点的性质,揭示出有界区域上复调和函数的两类表示式之间的关系. 相似文献
147.
YAN Zhen-Ya 《理论物理通讯》2003,39(2)
More recently, sixteen families of Jacobian elliptic function solutions of mKdV equation have been foundby using our extended Jacobian elliptic function expansion method. In this paper, we continue to improve our methodby using another eight pairs of the closed Jacobian elliptic functions. The mKdV equation is chosen to illustrate theimproved method such that another eight families of new Jacobian elliptic function solutions are obtained again. Thenew method can be more powerful to be applied to other nonlinear differential equations. 相似文献
148.
Hirofumi Tsumura. 《Mathematics of Computation》2004,73(245):251-258
In this paper, we give some evaluation formulas for Tornheim's type of alternating series by an elementary and combinatorial calculation of the uniformly convergent series. Indeed, we list several formulas for them by means of Riemann's zeta values at positive integers.
149.
This note investigates two long-standing conjectures on the Krull dimension of integer-valued polynomial rings and of polynomial rings in the context of (locally) essential domains.
150.
O. Wibbelhoff C. Meier A. Lorke P. Schafmeister A. D. Wieck 《Physica E: Low-dimensional Systems and Nanostructures》2004,21(2-4):516
We use frequency-dependent capacitance–voltage spectroscopy to study the dynamic charging of self-assembled InAs quantum dots. With increasing frequency, the AC charging becomes suppressed, beginning with the low-energy states. By applying an in-plane magnetic field, we generate an additional magnetic confinement that alters the tunneling barrier and hence the charging dynamics. In traveling through the potential barrier, the electrons acquire an additional momentum k0, proportional to the magnetic field B. As the tunneling is enhanced, when k0 matches the maximum of the electronic wave function Ψ (in momentum representation), we are able to map out the shape of Ψ by varying B. 相似文献