全文获取类型
收费全文 | 3790篇 |
免费 | 362篇 |
国内免费 | 360篇 |
专业分类
化学 | 209篇 |
晶体学 | 7篇 |
力学 | 400篇 |
综合类 | 96篇 |
数学 | 2769篇 |
物理学 | 1031篇 |
出版年
2024年 | 7篇 |
2023年 | 56篇 |
2022年 | 45篇 |
2021年 | 92篇 |
2020年 | 116篇 |
2019年 | 125篇 |
2018年 | 102篇 |
2017年 | 97篇 |
2016年 | 126篇 |
2015年 | 110篇 |
2014年 | 208篇 |
2013年 | 269篇 |
2012年 | 142篇 |
2011年 | 140篇 |
2010年 | 180篇 |
2009年 | 213篇 |
2008年 | 256篇 |
2007年 | 261篇 |
2006年 | 208篇 |
2005年 | 184篇 |
2004年 | 206篇 |
2003年 | 192篇 |
2002年 | 187篇 |
2001年 | 136篇 |
2000年 | 124篇 |
1999年 | 127篇 |
1998年 | 111篇 |
1997年 | 96篇 |
1996年 | 82篇 |
1995年 | 51篇 |
1994年 | 58篇 |
1993年 | 31篇 |
1992年 | 36篇 |
1991年 | 28篇 |
1990年 | 14篇 |
1989年 | 16篇 |
1988年 | 8篇 |
1987年 | 16篇 |
1986年 | 12篇 |
1985年 | 11篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1957年 | 2篇 |
排序方式: 共有4512条查询结果,搜索用时 31 毫秒
151.
Let be a compact immersed surface in the unit sphere with constant mean curvature . Denote by the linear map from into , , where is the linear map associated to the second fundamental form and is the identity map. Let denote the square of the length of . We prove that if , then is either totally umbilical or an -torus, where is a constant depending only on the mean curvature .
152.
153.
Hiroyasu Izeki 《Proceedings of the American Mathematical Society》2002,130(12):3731-3740
We give a sufficient condition for a higher dimensional Kleinian group to be convex cocompact in terms of the critical exponent of . As a consequence, we see that the fundamental group of a compact conformally flat manifold with positive scalar curvature is hyperbolic in the sense of Gromov. We give some other applications to geometry and topology of conformally flat manifolds with positive scalar curvature.
154.
We construct the intertwining operator superalgebras and vertex tensor categories for the superconformal unitary minimal models and other related models.
155.
Simon Gindikin Bernhard Krö tz 《Transactions of the American Mathematical Society》2002,354(8):3299-3327
In this paper we define a distinguished boundary for the complex crowns of non-compact Riemannian symmetric spaces . The basic result is that affine symmetric spaces of can appear as a component of this boundary if and only if they are non-compactly causal symmetric spaces.
156.
E. Vasserot 《Compositio Mathematica》2002,131(1):51-60
It was proved by Ginzburg, Mirkovic and Vilonen that the G(O)-equivariant perverse sheaves on the affine Grassmannian of a connected reductive group G form a tensor category equivalent to the tensor category of finite dimensional representations of the dual group G
. In this paper we construct explicitly the action of G
on the global cohomology of a perverse sheaf. 相似文献
157.
Di Zhao 《中国科学A辑(英文版)》1999,42(9):897-904
LetM be a compact Riemann manifold with the Ricci curvature ≽ - R(R = const. > 0) . Denote by d the diameter ofM. Then the first eigenvalue λ1 ofM satisfies
. Moreover if
, then
相似文献
158.
The spaces of linear differential operators
acting on -densities on
and the space
of functions on
which are polynomial on the fibers are not isomorphic as modules over the Lie algebra Vect (n) of vector fields of n. However, these modules are isomorphic as sl(n + 1,)-modules where
is the Lie algebra of infinitesimal projective transformations. In addition, such an
-equivariant bijection is unique (up to normalization). This leads to a notion of projectively equivariant quantization and symbol calculus for a manifold endowed with a (flat) projective structure. We apply the
-equivariant symbol map to study the
of kth-order linear differential operators acting on -densities, for an arbitrary manifold M and classify the quotient-modules
. 相似文献
159.
Emilio Musso Lorenzo Nicolodi 《Abhandlungen aus dem Mathematischen Seminar der Universit?t Hamburg》1999,69(1):123-138
We study surfaces with plane lines of curvature in the framework of Laguerre geometry and provide explicit representation
formulae for these surfaces in terms of a potential function. As an application, we explicitly integrate allL- minimal surfaces with plane curvature lines.
Partially supported by MURST 40. 相似文献
160.