全文获取类型
收费全文 | 22998篇 |
免费 | 2413篇 |
国内免费 | 2327篇 |
专业分类
化学 | 2370篇 |
晶体学 | 30篇 |
力学 | 1887篇 |
综合类 | 554篇 |
数学 | 16329篇 |
物理学 | 6568篇 |
出版年
2024年 | 30篇 |
2023年 | 185篇 |
2022年 | 361篇 |
2021年 | 404篇 |
2020年 | 479篇 |
2019年 | 487篇 |
2018年 | 516篇 |
2017年 | 639篇 |
2016年 | 735篇 |
2015年 | 554篇 |
2014年 | 1165篇 |
2013年 | 1513篇 |
2012年 | 1172篇 |
2011年 | 1401篇 |
2010年 | 1287篇 |
2009年 | 1582篇 |
2008年 | 1565篇 |
2007年 | 1664篇 |
2006年 | 1478篇 |
2005年 | 1379篇 |
2004年 | 1130篇 |
2003年 | 1076篇 |
2002年 | 892篇 |
2001年 | 835篇 |
2000年 | 763篇 |
1999年 | 656篇 |
1998年 | 599篇 |
1997年 | 546篇 |
1996年 | 405篇 |
1995年 | 312篇 |
1994年 | 264篇 |
1993年 | 198篇 |
1992年 | 170篇 |
1991年 | 145篇 |
1990年 | 148篇 |
1989年 | 99篇 |
1988年 | 99篇 |
1987年 | 80篇 |
1986年 | 73篇 |
1985年 | 101篇 |
1984年 | 77篇 |
1983年 | 57篇 |
1982年 | 75篇 |
1981年 | 64篇 |
1980年 | 43篇 |
1979年 | 41篇 |
1978年 | 35篇 |
1977年 | 27篇 |
1976年 | 37篇 |
1973年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
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
162.
163.
K-强凸空间的一些性质 总被引:4,自引:0,他引:4
结合Banach空间的Drop性,利用K维体积给出了K—强凸空间的一个新的定义,同时也给出了K—强光滑空间定义的K维体积表示,然后利用单位圆的切片证明了K—强凸空间是自反空间,进而证明了K—强凸空间与K—强光滑空间是一对对偶空间.最后利用Drop性的切片描述证明了K—强凸空间具有Drop性. 相似文献
164.
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
165.
Shui Cao ZHENG Huo Nan LIN Di He HU 《数学学报(英文版)》2005,21(5):1137-1148
In this paper, we investigate the Hausdorff measure for level sets of N-parameter Rd-valued stable processes, and develop a means of seeking the exact Hausdorff measure function for level sets of N-parameter Rd-valued stable processes. We show that the exact Hausdorff measure function of level sets of N-parameter Rd-valued symmetric stable processes of index α is Ф(r) = r^N-d/α (log log l/r)d/α when Nα 〉 d. In addition, we obtain a sharp lower bound for the Hausdorff measure of level sets of general (N, d, α) strictly stable processes. 相似文献
166.
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.
167.
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.
168.
We study the stationary measure for the two-dimensional Boussinesq equation with random forcing. We prove the ergodicity for the two-dimensional stochastically forced Boussinesq equation. We also study the Galerkin truncations of the three-dimensional Boussinesq equations under degenerate stochastic forcing. We follow closely the previous results on the stochastically forced Navier–Stokes equations. 相似文献
169.
Simple Entanglement Measure for Multipartite Pure States 总被引:3,自引:0,他引:3
Feng Pan Feng Pan Feng Pan Dan Liu Guoying Lu J. P. Draayer 《International Journal of Theoretical Physics》2004,43(5):1241-1247
A simple entanglement measure for multipartite pure states is formulated based on the partial entropy of a series of reduced density matrices. Use of the proposed new measure to distinguish disentangled, partially entangled, and maximally entangled multipartite pure states is illustrated. 相似文献
170.
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