全文获取类型
收费全文 | 1682篇 |
免费 | 96篇 |
国内免费 | 16篇 |
专业分类
化学 | 1126篇 |
晶体学 | 4篇 |
力学 | 55篇 |
数学 | 338篇 |
物理学 | 271篇 |
出版年
2024年 | 3篇 |
2023年 | 21篇 |
2022年 | 46篇 |
2021年 | 56篇 |
2020年 | 39篇 |
2019年 | 50篇 |
2018年 | 34篇 |
2017年 | 32篇 |
2016年 | 51篇 |
2015年 | 58篇 |
2014年 | 72篇 |
2013年 | 91篇 |
2012年 | 144篇 |
2011年 | 157篇 |
2010年 | 98篇 |
2009年 | 85篇 |
2008年 | 104篇 |
2007年 | 106篇 |
2006年 | 89篇 |
2005年 | 66篇 |
2004年 | 77篇 |
2003年 | 81篇 |
2002年 | 67篇 |
2001年 | 31篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 16篇 |
1997年 | 14篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1975年 | 3篇 |
1969年 | 1篇 |
1938年 | 1篇 |
1930年 | 1篇 |
排序方式: 共有1794条查询结果,搜索用时 0 毫秒
101.
In this paper, te edge mode variation is studied with three different methods: the reciprocal work method, already used by Torvik [J. Acoust. Soc. Am. 41 (1967) 346] to model this phenomenon, the S-parameter method and a finite element model that are applied for the first time to the study of the edge resonance. Moreover, laser probe measurements of the edge mode have also been performed and compared to the numerical predictions. The good agreement between the numerical predictions and the experimental data allows full understanding of the resonant phenomenon. The edge resonance is linked to the strong increase in amplitude of two complex Lamb waves, and the edge mode is proved to radiate into the plate as the first symmetrical Lamb mode S(0). Displacements at the edge and away from the edge have been computed and measured to evaluate the spatial and temporal behaviour of the edge mode. The dependence of the edge resonance frequency and amplitude on the Poisson coefficient has also been studied. 相似文献
102.
103.
104.
A new paclitaxel prodrug intended for use in Antibody-Directed Prodrug Therapy (ADEPT) or Prodrug Monotherapy (PMT) has been prepared. This prodrug was originally designed to be activated into the drug by human beta-glucuronidase. In order to enhance the liberation rate of paclitaxel, an elongated spacer system including a nitro-aromatic derivative and a N,N'-methylethylenediamine was incorporated between the sugar moiety and the drug. Indeed, this new prodrug proved to be activated significantly faster than a former paclitaxel prodrug containing a conventional spacer. 相似文献
105.
Guillou C Beunard JL Gras E Thal C 《Angewandte Chemie (International ed. in English)》2001,40(24):4745-4746
106.
107.
Emmanuel Montini 《Transactions of the American Mathematical Society》2003,355(4):1415-1441
In this article, we study the pointwise convergence of the spherical partial integral operator when it is applied to functions with a certain amount of smoothness. In particular, for , , , we prove that -quasieverywhere on , where is such that almost everywhere. A weaker version of this result in the range as well as some related localisation principles are also obtained. For and , we construct a function such that diverges everywhere.
108.
Let denote an elliptic curve over and the modular curve classifying the elliptic curves over such that the representations of in the 7-torsion points of and of are symplectically isomorphic. In case is given by a Weierstraß equation such that the invariant is a square, we exhibit here nontrivial points of . From this we deduce an infinite family of curves for which has at least four nontrivial points.
109.
We investigate the effects of temperature on the properties of the time relaxation to equilibrium and nonequilibrium steady states of correlation functions of some Langevin harmonic systems. We consider commonly used dissipative and conservative Langevin dynamics, and show that the time relaxation rate depends on the temperature in the case of thermal reservoirs at different temperatures connected to the system, but it does not happen in the case of relaxation to equilibrium, i.e., if all the heat bath are at the same temperature. Our formalism maps the initial stochastic problem on a noncanonical quantum field theory, and the calculations of the relaxation rates are based on a perturbative analysis. We argue to show the reliability of the perturbative computation. 相似文献
110.
Julia Lindberg Peter Saetre Seiji Nishino Emmanuel Mignot Elena Jazin 《BMC neuroscience》2007,8(1):34