全文获取类型
收费全文 | 532篇 |
免费 | 71篇 |
国内免费 | 41篇 |
专业分类
化学 | 7篇 |
力学 | 1篇 |
数学 | 405篇 |
物理学 | 231篇 |
出版年
2023年 | 14篇 |
2022年 | 20篇 |
2021年 | 18篇 |
2020年 | 36篇 |
2019年 | 16篇 |
2018年 | 22篇 |
2017年 | 18篇 |
2016年 | 22篇 |
2015年 | 14篇 |
2014年 | 17篇 |
2013年 | 62篇 |
2012年 | 11篇 |
2011年 | 21篇 |
2010年 | 19篇 |
2009年 | 26篇 |
2008年 | 36篇 |
2007年 | 27篇 |
2006年 | 23篇 |
2005年 | 34篇 |
2004年 | 16篇 |
2003年 | 28篇 |
2002年 | 30篇 |
2001年 | 14篇 |
2000年 | 20篇 |
1999年 | 23篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 8篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有644条查询结果,搜索用时 15 毫秒
1.
2.
3.
Bogdan Nita 《General Relativity and Gravitation》2003,35(10):1865-1868
Algebraically special gravitational fields are described using algebraic and differential invariants of the Weyl tensor. A type III invariant is also given and calculated for Robinson-Trautman spaces. 相似文献
4.
The graded Hecke algebra for a finite Weyl group is intimately related to the geometry of the Springer correspondence. A
construction of Drinfeld produces an analogue of a graded Hecke algebra for any finite subgroup of GL(V). This paper classifies all the algebras obtained by applying Drinfeld's construction to complex reflection groups. By giving
explicit (though nontrivial) isomorphisms, we show that the graded Hecke algebras for finite real reflection groups constructed
by Lusztig are all isomorphic to algebras obtained by Drinfeld's construction. The classification shows that there exist
algebras obtained from Drinfeld's construction which are not graded Hecke algebras as defined by Lusztig for real as well
as complex reflection groups.
Received: July 25, 2001 相似文献
5.
Morten S. Risager 《Journal of Number Theory》2004,109(1):96-119
We define the counting function for Maass newforms of Hecke congruence groups and calculate the three main terms of this counting function. We then give necessary and sufficient conditions for this expansion to have the same shape as if it were counting eigenvalues related to cocompact surfaces. We relate the result to classical instances of the Jacquet-Langlands correspondence. 相似文献
6.
7.
Entanglement as a vital resource for information processing can be described by special properties of the quantum state. Using the well-known Weyl basis we propose a new Bloch decomposition of the quantum state and study its separability problem. This decomposition enables us to find an alternative characterization of the separability based on the correlation matrix. We show that the criterion is effective in detecting entanglement for the isotropic states, Bell-diagonal states and some PPT entangled states. We also use the Weyl operators to construct an detecting operator for quantum teleportation. 相似文献
8.
9.
Symmetric informationally complete measurements (SICs in short) are highly symmetric structures in the Hilbert space. They possess many nice properties which render them an ideal candidate for fiducial measurements. The symmetry of SICs is intimately connected with the geometry of the quantum state space and also has profound implications for foundational studies. Here we explore those SICs that are most symmetric according to a natural criterion and show that all of them are covariant with respect to the Heisenberg–Weyl groups, which are characterized by the discrete analog of the canonical commutation relation. Moreover, their symmetry groups are subgroups of the Clifford groups. In particular, we prove that the SIC in dimension 2, the Hesse SIC in dimension 3, and the set of Hoggar lines in dimension 8 are the only three SICs up to unitary equivalence whose symmetry groups act transitively on pairs of SIC projectors. Our work not only provides valuable insight about SICs, Heisenberg–Weyl groups, and Clifford groups, but also offers a new approach and perspective for studying many other discrete symmetric structures behind finite state quantum mechanics, such as mutually unbiased bases and discrete Wigner functions. 相似文献
10.