全文获取类型
收费全文 | 7226篇 |
免费 | 187篇 |
国内免费 | 261篇 |
专业分类
化学 | 844篇 |
晶体学 | 29篇 |
力学 | 32篇 |
综合类 | 9篇 |
数学 | 6155篇 |
物理学 | 605篇 |
出版年
2023年 | 11篇 |
2022年 | 17篇 |
2021年 | 13篇 |
2020年 | 19篇 |
2019年 | 211篇 |
2018年 | 235篇 |
2017年 | 96篇 |
2016年 | 50篇 |
2015年 | 71篇 |
2014年 | 238篇 |
2013年 | 587篇 |
2012年 | 274篇 |
2011年 | 487篇 |
2010年 | 386篇 |
2009年 | 477篇 |
2008年 | 519篇 |
2007年 | 466篇 |
2006年 | 401篇 |
2005年 | 255篇 |
2004年 | 207篇 |
2003年 | 201篇 |
2002年 | 150篇 |
2001年 | 162篇 |
2000年 | 158篇 |
1999年 | 196篇 |
1998年 | 185篇 |
1997年 | 154篇 |
1996年 | 198篇 |
1995年 | 189篇 |
1994年 | 183篇 |
1993年 | 169篇 |
1992年 | 99篇 |
1991年 | 33篇 |
1990年 | 20篇 |
1989年 | 18篇 |
1988年 | 21篇 |
1987年 | 24篇 |
1986年 | 16篇 |
1985年 | 51篇 |
1984年 | 63篇 |
1983年 | 47篇 |
1982年 | 51篇 |
1981年 | 57篇 |
1980年 | 38篇 |
1979年 | 37篇 |
1978年 | 38篇 |
1977年 | 29篇 |
1976年 | 20篇 |
1975年 | 17篇 |
1973年 | 12篇 |
排序方式: 共有7674条查询结果,搜索用时 31 毫秒
91.
Christophe Cuny 《Journal of multivariate analysis》2006,97(8):1842-1869
Let (Xm,n)(m,n)∈Z2 be a Cp-valued wide sense stationary process. We study the prediction theory of such processes according to different total orders on Z2. In the case of a “rational order”, we give the spectral distribution of the resulting evanescent component and prove that for two different rational orders, the resulting evanescent components are mutually orthogonal. 相似文献
92.
Armen Shirikyan 《Probability Theory and Related Fields》2006,134(2):215-247
We consider a class of dissipative PDE's perturbed by an external random force. Under the condition that the distribution
of perturbation is sufficiently non-degenerate, a strong law of large numbers (SLLN) and a central limit theorem (CLT) for
solutions are established and the corresponding rates of convergence are estimated. It is also shown that the estimates obtained
are close to being optimal. The proofs are based on the property of exponential mixing for the problem in question and some
abstract SLLN and CLT for mixing-type Markov processes. 相似文献
93.
94.
Chang-Wan Kim 《Archiv der Mathematik》2007,88(4):378-384
We showed that any compact locally symmetric Finsler metric with positive flag curvature must be Riemannian.
Dedicated to Professor Karsten Grove on the occassion of his sixtieth birthday
Received: 8 May 2006 相似文献
95.
We study the large-time behavior and rate of convergence to the invariant measures of the processes dX
(t)=b(X)
(t)) dt + (X
(t)) dB(t). A crucial constant appears naturally in our study. Heuristically, when the time is of the order exp( – )/2 , the transition density has a good lower bound and when the process has run for about exp( – )/2, it is very close to the invariant measure. LetL
=(2/2) – U · be a second-order differential operator on d. Under suitable conditions,L
z has the discrete spectrum
- \lambda _2^\varepsilon ...and lim \varepsilon ^2 log \lambda _2^\varepsilon = - \Lambda \hfill \\ \varepsilon \to 0 \hfill \\ \end{gathered} $$
" align="middle" vspace="20%" border="0"> 相似文献
96.
Jenó Szigeti 《Order》1990,7(1):77-81
Given a linearly ordered set (A,
R
) and an R-monotone function f: AA, we give a necessary and sufficient condition on A, f,
R
, involving generating sets and forbidden subalgebras, for
R
to be a well-ordering.Partially supported by Hungarian National Foundation for Scientific Research Grant nr. 1813. 相似文献
97.
Kazimierz Bragiel 《Letters in Mathematical Physics》1990,20(3):251-257
It is proved that C(S
U(N)) is a type I C
*-algebra. 相似文献
98.
Lothar Berg 《Aequationes Mathematicae》1990,40(1):44-53
Summary A certain class of entire functionsF(s) of order zero which are asymptotically equal to the sum of just two neighbouring terms of their power series when |s| with |args| < – for any fixed > 0, is investigated. Which two terms one has to take, depends upons. It is shown that these functions have infinitely many negative zeros, and the asymptotic behaviour of the zeros is also determined. 相似文献
99.
IfK is a field of characteristic 0 then the following is shown. Iff, g, h: M
n
(K) K are non-constant solutions of the Binet—Pexider functional equation
|
设为首页 | 免责声明 | 关于勤云 | 加入收藏 |
Copyright©北京勤云科技发展有限公司 京ICP备09084417号 |