全文获取类型
收费全文 | 7044篇 |
免费 | 277篇 |
国内免费 | 41篇 |
专业分类
化学 | 4617篇 |
晶体学 | 33篇 |
力学 | 236篇 |
综合类 | 9篇 |
数学 | 877篇 |
物理学 | 1590篇 |
出版年
2023年 | 43篇 |
2022年 | 70篇 |
2021年 | 79篇 |
2020年 | 106篇 |
2019年 | 110篇 |
2018年 | 128篇 |
2017年 | 93篇 |
2016年 | 169篇 |
2015年 | 207篇 |
2014年 | 187篇 |
2013年 | 395篇 |
2012年 | 460篇 |
2011年 | 434篇 |
2010年 | 292篇 |
2009年 | 195篇 |
2008年 | 422篇 |
2007年 | 396篇 |
2006年 | 357篇 |
2005年 | 336篇 |
2004年 | 280篇 |
2003年 | 284篇 |
2002年 | 234篇 |
2001年 | 146篇 |
2000年 | 152篇 |
1999年 | 84篇 |
1998年 | 109篇 |
1997年 | 70篇 |
1996年 | 100篇 |
1995年 | 64篇 |
1994年 | 67篇 |
1993年 | 66篇 |
1992年 | 61篇 |
1991年 | 42篇 |
1990年 | 47篇 |
1989年 | 39篇 |
1988年 | 48篇 |
1986年 | 33篇 |
1985年 | 62篇 |
1984年 | 65篇 |
1983年 | 34篇 |
1982年 | 55篇 |
1981年 | 58篇 |
1980年 | 46篇 |
1979年 | 43篇 |
1978年 | 49篇 |
1977年 | 52篇 |
1976年 | 65篇 |
1975年 | 37篇 |
1974年 | 32篇 |
1973年 | 36篇 |
排序方式: 共有7362条查询结果,搜索用时 11 毫秒
11.
In this paper we use real analysis techniques to establish a new real Paley-Wiener theorems for the Fourier-Bessel transform associated with the Weinstein operator. More precisely we characterize the C ∞-functions whose image under the Fourier-Bessel transform are functions with compact support through an L p growth condition, p ∈ [1, +∞] and we give another version of the real Paley-Wiener theorem for L 2-functions. 相似文献
12.
Bahattin Gümgüm Nermin Biricik Feyyaz Durap Ismail Özdemir Nevin Gürbüz Wee Han Ang Paul J. Dyson 《应用有机金属化学》2007,21(8):711-715
Palladium(II) complexes with N,N‐bis(diphenylphosphino)aniline ligands catalyse the Heck reaction between styrene and aryl bromides, affording stilbenes in good yield. The structures of two of the complexes used as pre‐catalysts have been determined by single‐crystal X‐ray diffraction. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
13.
Jan Annaert Griselda Deelstra Michèle Vanmaele 《Insurance: Mathematics and Economics》2007,41(3):299-316
In this paper, we elaborate a formula for determining the optimal strike price for a bond put option, used to hedge a position in a bond. This strike price is optimal in the sense that it minimizes, for a given budget, either Value-at-Risk or Tail Value-at-Risk. Formulas are derived for both zero-coupon and coupon bonds, which can also be understood as a portfolio of bonds. These formulas are valid for any short rate model that implies an affine term structure model and in particular that implies a lognormal distribution of future zero-coupon bond prices. As an application, we focus on the Hull-White one-factor model, which is calibrated to a set of cap prices. We illustrate our procedure by hedging a Belgian government bond, and take into account the possibility of divergence between theoretical option prices and real option prices. This paper can be seen as an extension of the work of Ahn and co-workers [Ahn, D., Boudoukh, J., Richardson, M., Whitelaw, R., 1999. Optimal risk management using options. J. Financ. 54, 359-375], who consider the same problem for an investment in a share. 相似文献
14.
15.
E. Liénard G. Ban J. Blieck D. Durand F. Duval X. Fléchard M. Herbane M. Labalme Y. Lemière F. Mauger A. Méry O. Naviliat-Cuncic D. Rodríguez J. C. Thomas 《Hyperfine Interactions》2006,172(1-3):29-33
We report on the status of the LPCTrap experiment, devoted to measure the β–ν angular correlation in the pure Gamow–Teller
decay of 6He. This measurement is motivated by the search for the presence of tensor type contributions to the weak interaction. The
6He ions are confined in a novel transparent Paul trap. The β particles and the recoil ions are detected in coincidence to
deduce the angular correlation parameter. The commissioning run performed in 2005 has given the proof of principle of this
experiment. Up to 105 coincidences were recorded during a second run in 2006. 相似文献
16.
Mathilde Kammerer-Colin de Verdière 《Comptes Rendus Mathematique》2004,339(9):625-629
For generic families of vector fields or transformations, normally hyperbolic invariant products of spheres appear near partially elliptic rest points. To cite this article: M. Kammerer-Colin de Verdière, C. R. Acad. Sci. Paris, Ser. I 339 (2004). 相似文献
17.
Pierre Crispel Pierre Degond Céline Parzani Marie-Hélène Vignal 《Comptes Rendus Mathematique》2004,338(4):327-332
In this Note, we propose three formulations of a model describing a quasi-neutral plasma with non-vanishing current. In order to study and compare the numerical efficiency of each formulation, two test-problems are implemented in one dimension. The first is a periodic perturbation of a uniform stationary plasma. The second is a case of plasma expansion in vacuum between two electrodes. To cite this article: P. Crispel et al., C. R. Acad. Sci. Paris, Ser. I 338 (2004). 相似文献
18.
We prove that given a simply connected compact manifold M and a
closed manifold N, any map in the Sobolev space W
1,2(M,N) can be
approximated weakly by smooth maps between M and N.
Submitted: September 2002, Final version: November 2002. 相似文献
19.
Pavol Brunovsky Geneviève Raugel 《Journal of Dynamics and Differential Equations》2003,15(2-3):571-658
We prove that for damped hyperbolic equations the Morse-Smale property (hyperbolicity of equilibria and transversal intersection of stable and unstable manifolds) is generic. More precisely, we prove that in an appropriate functional space of nonlinear terms in the equation, the set of functions for which the latter has the Morse-Smale property is residual, i.e., it is a countable intersection of open dense sets. The result extends a similar result proved in [1] for reaction diffusion equations. However, because of the absence of knowledge about nodal sets of polutions new ideas were needed in the proof. 相似文献
20.
Michèle Audin 《manuscripta mathematica》2007,124(4):533-550
In this paper, we investigate symplectic manifolds endowed with a Morse–Bott function with only two critical submanifolds,
one of which is Lagrangian while the other one is symplectic. 相似文献