全文获取类型
收费全文 | 592篇 |
免费 | 86篇 |
国内免费 | 40篇 |
专业分类
化学 | 17篇 |
晶体学 | 3篇 |
力学 | 4篇 |
综合类 | 2篇 |
数学 | 418篇 |
物理学 | 274篇 |
出版年
2024年 | 1篇 |
2023年 | 14篇 |
2022年 | 22篇 |
2021年 | 22篇 |
2020年 | 37篇 |
2019年 | 16篇 |
2018年 | 25篇 |
2017年 | 20篇 |
2016年 | 23篇 |
2015年 | 16篇 |
2014年 | 19篇 |
2013年 | 70篇 |
2012年 | 15篇 |
2011年 | 23篇 |
2010年 | 22篇 |
2009年 | 27篇 |
2008年 | 40篇 |
2007年 | 30篇 |
2006年 | 29篇 |
2005年 | 38篇 |
2004年 | 20篇 |
2003年 | 31篇 |
2002年 | 30篇 |
2001年 | 14篇 |
2000年 | 21篇 |
1999年 | 25篇 |
1998年 | 20篇 |
1997年 | 13篇 |
1996年 | 9篇 |
1995年 | 3篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有718条查询结果,搜索用时 31 毫秒
71.
Holonomy algebras of Weyl connections in Lorentzian signature are classified. In particular, examples of Weyl connections with all possible holonomy algebras are constructed. 相似文献
72.
A rank-three condition for invariant (1, 2)-symplectic almost Hermitian structures on flag manifolds
Nir Cohen Caio J.C. Negreiros Luiz A.B. San Martin 《Bulletin of the Brazilian Mathematical Society》2002,33(1):49-73
This paper considers invariant (1, 2)-symplectic almost Hermitian structures on the maximal flag manifod associated to a
complex semi-simple Lie group G. The concept of cone-free invariant almost complex structure is introduced. It involves the rank-three subgroups of G, and generalizes the cone-free property for tournaments related to 𝕊l (n,ℂ) case. It is proved that the cone-free property is necessary for an invariant almost-complex structure to take part in
an invariant (1, 2)-symplectic almost Hermitian structure. It is also sufficient if the Lie group is not B
l , l ≥ 3, G
2 or F
4. For B
l and F
4 a close condition turns out to be sufficient.
Received: 28 October 2001 相似文献
73.
Barbara Opozda 《Geometriae Dedicata》1998,73(2):215-223
The notion of infinitesimal homogeneity is extended to arbitrary connections on G-structures. Two theorems of Singer type are proved for the extended notion. The results are applied to conformal and Weyl structures. 相似文献
74.
R. J. Baston 《Journal of Geometry and Physics》1992,8(1-4):29-52
Each regular or semi-regular integral affine orbit of the Weyl group of gl(2n + 2,
) invariantly determines a locally exact differential complex on a 4n dimensional quaternionic manifold. This gives quaternionic analogues of Dolbeault cohomology on complex manifolds. We compute the index of such complexes in the hyper-Kähler case, showing that quaternionic cohomology is not trivial. 相似文献
75.
NovelWavefrontCorrectorforAdaptiveLaserResonatorNovelWavefrontCorrectorforAdaptiveLaserResonator¥ZHANGGuoping;YEJiaxiong;LIZh... 相似文献
76.
E. Horozov 《Bulletin des Sciences Mathématiques》2002,126(7):605-614
In this paper we give another characterization of the strictly nilpotent elements in the Weyl algebra, which (apart from the polynomials) turn out to be all bispectral operators with polynomial coefficients. This also allows to reformulate in terms of bispectral operators the famous conjecture, that all the endomorphisms of the Weyl algebra are automorphisms (Dixmier, Kirillov, etc). 相似文献
77.
We study bounded and unbounded *-representations of Twisted Generalized Weyl Algebras and algebras similar to them for different choices of involutions. 相似文献
78.
79.
用解析方法来确定由二种因素引起的Corkscrew振荡所造成的归一发射度增长的表达式。这二种因素是电子束的非理想注入以及聚焦磁场相对于系统轴的随机偏斜。 相似文献
80.
We give a birational realization of affine Weyl group of type A
(1)
m–1 × A
(1)
n–1. We apply this representation to construct some discrete integrable systems and discrete Painlevé equations. Our construction has a combinatorial counterpart through the ultra-discretization procedure. 相似文献