全文获取类型
收费全文 | 1886篇 |
免费 | 168篇 |
国内免费 | 4篇 |
专业分类
化学 | 1309篇 |
晶体学 | 5篇 |
力学 | 54篇 |
数学 | 349篇 |
物理学 | 341篇 |
出版年
2023年 | 38篇 |
2022年 | 20篇 |
2021年 | 55篇 |
2020年 | 118篇 |
2019年 | 84篇 |
2018年 | 49篇 |
2017年 | 42篇 |
2016年 | 128篇 |
2015年 | 96篇 |
2014年 | 98篇 |
2013年 | 105篇 |
2012年 | 134篇 |
2011年 | 141篇 |
2010年 | 82篇 |
2009年 | 68篇 |
2008年 | 89篇 |
2007年 | 83篇 |
2006年 | 65篇 |
2005年 | 54篇 |
2004年 | 29篇 |
2003年 | 38篇 |
2002年 | 43篇 |
2001年 | 23篇 |
2000年 | 15篇 |
1999年 | 10篇 |
1998年 | 11篇 |
1996年 | 15篇 |
1995年 | 10篇 |
1994年 | 18篇 |
1993年 | 8篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1986年 | 10篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1978年 | 9篇 |
1977年 | 8篇 |
1976年 | 6篇 |
1974年 | 7篇 |
1968年 | 6篇 |
1967年 | 10篇 |
1963年 | 6篇 |
1912年 | 7篇 |
1909年 | 5篇 |
排序方式: 共有2058条查询结果,搜索用时 15 毫秒
1.
Edelsbacher Philipp Redhammer Gnther Monkowius Uwe 《Monatshefte für Chemie / Chemical Monthly》2020,151(4):543-547
Monatshefte für Chemie - Chemical Monthly - Four members of a new series of paddle-wheel copper(II) complexes bearing cyclobutanecarboxylate as bridging ligand with pyridine derived ligands in... 相似文献
2.
3.
Richard F. W. Bader 《International journal of quantum chemistry》1994,49(3):299-308
The physics of a system is determined by a variation of the action integral, i.e., by a variation of the space–time volume integral of the Lagrange function. If one demands that the properties of an atom in a molecule be derived from physics, the atom must generate its own space–time volume, requiring that its boundaries be defined in real space. The variations in the action are related to the actions of generators of infinitesimal unitary transformations. In the general case, the action integral is altered by generators acting in both the spacelike and timelike surface bounding the space–time volume, whereas for a total isolated system, the physics is totally determined by their action in just the spacelike surfaces at the two time endpoints. It is shown and illustrated for a one-dimensional system that the definition of an atom corresponds to the possibility of choosing a subsystem in such a way that the contributions to the change in action resulting from the evolution in time of its spatial boundaries vanishes identically. The properties of these subsystems and of the total system of which they are a part are, therefore, determined by one and the same action principle. This choice of subsystem corresponds to the possibility of augmenting the Lagrange function by the divergence of the gradient of the electron density a step that, while leaving the equations of motion unchanged, modifies the generating operators in the required manner. © 1994 John Wiley & Sons, Inc. 相似文献
4.
5.
6.
We study property (T) and the fixed-point property for actions on L
p
and other Banach spaces. We show that property (T) holds when L
2 is replaced by L
p
(and even a subspace/quotient of L
p
), and that in fact it is independent of 1≤p<∞. We show that the fixed-point property for L
p
follows from property (T) when 1<p< 2+ε. For simple Lie groups and their lattices, we prove that the fixed-point property for L
p
holds for any 1< p<∞ if and only if the rank is at least two. Finally, we obtain a superrigidity result for actions of irreducible lattices
in products of general groups on superreflexive spaces.
Bader partially supported by ISF grant 100146; Furman partially supported by NSF grants DMS-0094245 and DMS-0604611; Gelander
partially supported by NSF grant DMS-0404557 and BSF grant 2004010; Monod partially supported by FNS (CH) and NSF (US). 相似文献
7.
Laura Bader Nicola Durante Maska Law Guglielmo Lunardon Tim Penttila 《Designs, Codes and Cryptography》2003,29(1-3):41-50
We do the tentative beginnings of a study of BLT-sets of generalised quadrangles via their symmetries. In particular, the study of whorls about a line leads us to hyperbolic reflections preserving a BLT-set of Q(4, q). 相似文献
8.
9.
10.