全文获取类型
收费全文 | 3949篇 |
免费 | 164篇 |
国内免费 | 2篇 |
专业分类
化学 | 2644篇 |
晶体学 | 9篇 |
力学 | 98篇 |
数学 | 556篇 |
物理学 | 808篇 |
出版年
2023年 | 28篇 |
2022年 | 21篇 |
2021年 | 30篇 |
2020年 | 51篇 |
2019年 | 34篇 |
2018年 | 67篇 |
2017年 | 36篇 |
2016年 | 93篇 |
2015年 | 101篇 |
2014年 | 107篇 |
2013年 | 200篇 |
2012年 | 276篇 |
2011年 | 289篇 |
2010年 | 145篇 |
2009年 | 124篇 |
2008年 | 198篇 |
2007年 | 228篇 |
2006年 | 193篇 |
2005年 | 178篇 |
2004年 | 158篇 |
2003年 | 119篇 |
2002年 | 118篇 |
2001年 | 62篇 |
2000年 | 32篇 |
1999年 | 25篇 |
1998年 | 23篇 |
1997年 | 23篇 |
1996年 | 20篇 |
1995年 | 20篇 |
1994年 | 20篇 |
1993年 | 19篇 |
1988年 | 16篇 |
1983年 | 18篇 |
1982年 | 16篇 |
1981年 | 23篇 |
1980年 | 15篇 |
1977年 | 15篇 |
1937年 | 20篇 |
1936年 | 16篇 |
1935年 | 17篇 |
1934年 | 26篇 |
1933年 | 24篇 |
1932年 | 29篇 |
1931年 | 18篇 |
1930年 | 24篇 |
1929年 | 24篇 |
1928年 | 20篇 |
1927年 | 28篇 |
1926年 | 15篇 |
1924年 | 20篇 |
排序方式: 共有4115条查询结果,搜索用时 46 毫秒
1.
In this paper, we design a Branch and Bound algorithm based on interval arithmetic to address nonconvex robust optimization problems. This algorithm provides the exact global solution of such difficult problems arising in many real life applications. A code was developed in MatLab and was used to solve some robust nonconvex problems with few variables. This first numerical study shows the interest of this approach providing the global solution of such difficult robust nonconvex optimization problems.
相似文献2.
3.
4.
5.
Naphthalimide‐phthalimide derivative based photoinitiating systems for polymerization reactions under blue lights
下载免费PDF全文
![点击此处可从《Journal of polymer science. Part A, Polymer chemistry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Pu Xiao Frédéric Dumur Jing Zhang Bernadette Graff Didier Gigmes Jean Pierre Fouassier Jacques Lalevée 《Journal of polymer science. Part A, Polymer chemistry》2015,53(5):665-674
Naphthalimide‐phthalimide derivatives (NDPDs) have been synthesized and combined with an iodonium salt, N‐vinylcarbazole, amine or 2,4,6‐tris(trichloromethyl)‐1,3,5‐triazine to produce reactive species (i.e., radicals and cations). These generated reactive species are capable of initiating the cationic polymerization of epoxides and/or the radical polymerization of acrylates upon exposure to very soft polychromatic visible lights or blue lights. Compared with the well‐known camphorquinone based systems used as references, the novel NDPD based combinations employed here demonstrate clearly higher efficiencies for the cationic polymerization of epoxides under air as well as the radical polymerization of acrylates. Remarkably, one of the NDPDs (i.e., NDPD2) based systems is characterized by an outstanding reactivity. The structure/reactivity/efficiency relationships of the investigated NDPDs were studied by fluorescence, cyclic voltammetry, laser flash photolysis, electron spin resonance spin trapping, and steady state photolysis techniques. The key parameters for their reactivity are provided. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 665–674 相似文献
6.
7.
Various physical systems of dispersive waves admit solutions in the form of generalized solitary waves. Such waves result from the resonance between a long localized wave and short periodic oscillations. Many estimates (rigorous and numerical) have been given for the amplitude of the ripples in the tail of the generalized solitary wave when its central part has a sech2 shape. This Note provides estimates (not yet rigorous) for the ripple amplitude when the central part is flat and wide. To cite this article: C. Fochesato, F. Dias, C. R. Acad. Sci. Paris, Ser. I 337 (2003). 相似文献
8.
L. Bugliaro J. Fröhlich G.M. Graf J. Stubbe C. Fefferman 《Communications in Mathematical Physics》1997,187(3):567-582
A Lieb-Thirring-Sobolev type inequality for Pauli Hamiltonians with magnetic fields is derived. The bound is in terms of an
effective field, whose energy is comparable to that of the magnetic field itself. An application to the stability of matter
in magnetic fields is given.
Received: 19 September 1996 / Accepted: 3 January 1997 相似文献
9.
This Note deals with optimal control problems with only one control variable and one state constraint, of arbitrary order. We consider the case of finitely many boundary arcs and touch times. We obtain a no-gap theory of second-order conditions, allowing us to characterize second-order quadratic growth. To cite this article: J.F. Bonnans, A. Hermant, C. R. Acad. Sci. Paris, Ser. I 343 (2006). 相似文献
10.