全文获取类型
收费全文 | 593篇 |
免费 | 25篇 |
国内免费 | 93篇 |
专业分类
化学 | 136篇 |
晶体学 | 2篇 |
综合类 | 1篇 |
数学 | 503篇 |
物理学 | 69篇 |
出版年
2024年 | 4篇 |
2023年 | 12篇 |
2022年 | 11篇 |
2021年 | 15篇 |
2020年 | 15篇 |
2019年 | 24篇 |
2018年 | 17篇 |
2017年 | 12篇 |
2016年 | 12篇 |
2015年 | 15篇 |
2014年 | 18篇 |
2013年 | 31篇 |
2012年 | 11篇 |
2011年 | 37篇 |
2010年 | 18篇 |
2009年 | 40篇 |
2008年 | 48篇 |
2007年 | 42篇 |
2006年 | 40篇 |
2005年 | 30篇 |
2004年 | 32篇 |
2003年 | 19篇 |
2002年 | 17篇 |
2001年 | 24篇 |
2000年 | 9篇 |
1999年 | 21篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 24篇 |
1995年 | 15篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 8篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有711条查询结果,搜索用时 15 毫秒
71.
Manuel Amann 《Topology and its Applications》2011,158(2):183-189
Positive Quaternion Kähler Manifolds are Riemannian manifolds with holonomy contained in Sp(n)Sp(1) and with positive scalar curvature. Conjecturally, they are symmetric spaces. In this article we are mainly concerned with Positive Quaternion Kähler Manifolds M satisfying b4(M)=1. Generalising a result of Galicki and Salamon we prove that M4n in this case is homothetic to a quaternionic projective space if 2≠n?6. 相似文献
72.
73.
Joachim Toft 《Bulletin des Sciences Mathématiques》2002,126(2):115-142
We study continuity properties for a family {sp}p?1 of increasing Banach algebras under the twisted convolution, which also satisfies that a∈sp, if and only if the Weyl operator aw(x,D) is a Schatten-von Neumann operator of order p on L2. We discuss inclusion relations between the sp-spaces, Besov spaces and Sobolev spaces. We prove also a Young type result on sp for dilated convolution. As an application we prove that f(a)∈s1, when a∈s1 and f is an entire odd function. We finally apply the results on Toeplitz operators and prove that we may extend the definition for such operators. 相似文献
74.
Martino Prizzi 《Journal of Differential Equations》2005,210(2):429-451
We study a non-autonomous parabolic equation with almost-periodic, rapidly oscillating principal part and nonlinear interactions. We associate to the equation a skew-product semiflow and, for a special class of nonlinearities, we define the Conley index of isolated compact invariant sets. As the frequency of the oscillations tends to infinity, we prove that every isolated compact invariant set of the averaged autonomous equation can be continued to an isolated compact invariant set of the skew-product semiflow associated to the non-autonomous equation. Finally, we illustrate some examples in which the Conley index can be explicitly computed and can be exploited to detect the existence of recurrent dynamics in the equation. 相似文献
75.
We study the Jordan structures and geometry of bounded matrix-valued harmonic functions on a homogeneous space and their analogue, the harmonic functionals, in the setting of Fourier algebras of homogeneous spaces.Supported by EPSRC grant GR/G91182 and NSERC grant 7679. 相似文献
76.
Consider the standard continuous percolation in ℝ4, and choose the parameters so that the induced percolation on a fixed two dimensional linear subspace is critical. Although
two dimensional critical percolation dies, we show that there are exceptional two dimensional linear subspaces, in which percolation
occurs.
Received: 1 April 1997 / Revised version: 20 January 1998 相似文献
77.
Francesca Astengo 《Differential Geometry and its Applications》2008,26(6):676-682
We prove that a Damek-Ricci space is symmetric if and only if the geodesic inversion preserves the set of horocycles. 相似文献
78.
P. Masani 《Journal of multivariate analysis》1977,7(2):292-335
We extend the Lévy inversion formula for the recovery of a bounded measure over from its Fourier-Stieltjes transform to bounded complex-valued, orthogonally scattered Hilbert space-valued, and spectral projection operator-valued measures over any first countable locally compact Abelian group. All our results are direct generalizations of known inversions for . 相似文献
79.
Summary We derive surface order large deviation estimates for the volume of the largest cluster and for the volume of the largest region surrounded by a cluster of a Bernoulli percolation process restricted to a big finite box, with sufficiently large parameter. We also establish a useful version of the isoperimetric inequality, which is the main tool of our proofs. 相似文献
80.
B. Cahen 《Letters in Mathematical Physics》1996,36(1):65-75
We suggest a realization of the deformation program for principal series representation of a semisimple Lie group by use of a generalized Weyl correspondence. 相似文献