全文获取类型
收费全文 | 80741篇 |
免费 | 454篇 |
国内免费 | 410篇 |
专业分类
化学 | 25908篇 |
晶体学 | 800篇 |
力学 | 6764篇 |
数学 | 32447篇 |
物理学 | 15686篇 |
出版年
2022年 | 51篇 |
2021年 | 110篇 |
2020年 | 79篇 |
2019年 | 116篇 |
2018年 | 10517篇 |
2017年 | 10293篇 |
2016年 | 6162篇 |
2015年 | 957篇 |
2014年 | 388篇 |
2013年 | 486篇 |
2012年 | 3967篇 |
2011年 | 10714篇 |
2010年 | 5754篇 |
2009年 | 6183篇 |
2008年 | 6773篇 |
2007年 | 8903篇 |
2006年 | 430篇 |
2005年 | 1479篇 |
2004年 | 1631篇 |
2003年 | 2069篇 |
2002年 | 1112篇 |
2001年 | 280篇 |
2000年 | 314篇 |
1999年 | 189篇 |
1998年 | 215篇 |
1997年 | 171篇 |
1996年 | 230篇 |
1995年 | 131篇 |
1994年 | 88篇 |
1993年 | 105篇 |
1992年 | 66篇 |
1991年 | 72篇 |
1990年 | 53篇 |
1989年 | 63篇 |
1988年 | 62篇 |
1987年 | 58篇 |
1986年 | 57篇 |
1985年 | 50篇 |
1984年 | 46篇 |
1983年 | 40篇 |
1982年 | 42篇 |
1981年 | 39篇 |
1980年 | 47篇 |
1979年 | 49篇 |
1978年 | 38篇 |
1914年 | 45篇 |
1913年 | 40篇 |
1912年 | 40篇 |
1909年 | 41篇 |
1908年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 397 毫秒
171.
Christian Remling 《Communications in Mathematical Physics》2007,271(1):275-287
I present an example of a discrete Schrödinger operator that shows that it is possible to have embedded singular spectrum and, at the same time, discrete eigenvalues that approach the edges of the essential spectrum (much) faster than exponentially. This settles a conjecture of Simon (in the negative). The potential is of von Neumann-Wigner type, with careful navigation around a previously identified borderline situation. 相似文献
172.
Maxim V. Pavlov 《Communications in Mathematical Physics》2007,272(2):469-505
The algebro-geometric approach for integrability of semi-Hamiltonian hydrodynamic type systems is presented. The class of
symmetric hydrodynamic type systems is defined and the calculation of the associated Riemann surfaces is greatly simplified for this
class. Many interesting and physically motivated examples are investigated. 相似文献
173.
174.
Kwang-Hua W. Chu 《International Journal of Theoretical Physics》2007,46(12):3230-3233
The modified Gross–Pitaevskii equation was derived and solved to obtain the 1D solution in the zero-energy limit. This stationary
solution could account for the dominated contributions due to the kinetic effect as well as the chemical potential in inhomogeneous
Bose gases. 相似文献
175.
Djamel Meraghni Abdelhakim Necir 《Methodology and Computing in Applied Probability》2007,9(4):557-572
The characteristic exponent α of a Lévy-stable law S
α
(σ, β, μ) was thoroughly studied as the extreme value index of a heavy tailed distribution. For 1 < α < 2, Peng (Statist. Probab. Lett. 52: 255–264, 2001) has proposed, via the extreme value approach, an asymptotically normal estimator for the location parameter μ. In this paper, we derive by the same approach, an estimator for the scale parameter σ and we discuss its limiting behavior.
相似文献
176.
177.
178.
179.
Maxim Perelstein 《Pramana》2006,67(5):813-820
Little Higgs models are an interesting extension of the Standard Model at the TeV scale. They provide a simple and attractive
mechanism of electroweak symmetry breaking. We review one of the simplest models of this class, the Littlest Higgs model,
and its extension with T parity. The model with T parity satisfies precision electroweak constraints without fine-tuning, contains an attractive dark matter candidate, and
leads to interesting phenomenology at the Large Hadron Collider (LHC). 相似文献
180.
Elizabeth Wulcan 《Arkiv f?r Matematik》2007,45(1):157-178
With a given holomorphic section of a Hermitian vector bundle, one can associate a residue current by means of Cauchy–Fantappiè–Leray
type formulas. In this paper we define products of such residue currents. We prove that, in the case of a complete intersection,
the product of the residue currents of a tuple of sections coincides with the residue current of the direct sum of the sections. 相似文献