全文获取类型
收费全文 | 864篇 |
免费 | 39篇 |
国内免费 | 71篇 |
专业分类
化学 | 31篇 |
力学 | 44篇 |
综合类 | 1篇 |
数学 | 783篇 |
物理学 | 115篇 |
出版年
2023年 | 10篇 |
2022年 | 12篇 |
2021年 | 10篇 |
2020年 | 18篇 |
2019年 | 5篇 |
2018年 | 16篇 |
2017年 | 28篇 |
2016年 | 33篇 |
2015年 | 28篇 |
2014年 | 51篇 |
2013年 | 71篇 |
2012年 | 57篇 |
2011年 | 57篇 |
2010年 | 69篇 |
2009年 | 76篇 |
2008年 | 39篇 |
2007年 | 51篇 |
2006年 | 62篇 |
2005年 | 31篇 |
2004年 | 34篇 |
2003年 | 28篇 |
2002年 | 35篇 |
2001年 | 37篇 |
2000年 | 19篇 |
1999年 | 19篇 |
1998年 | 22篇 |
1997年 | 14篇 |
1996年 | 11篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 9篇 |
1987年 | 1篇 |
排序方式: 共有974条查询结果,搜索用时 15 毫秒
71.
蒋美群 《高等学校计算数学学报(英文版)》1994,(1)
In this paper the Schwarz alternating method for a fourth-order elliptic variational inequality problem is considered by way of the equivalent form, and the geometric convergence is obtained on two subdomains. 相似文献
72.
郭伟平 《数学物理学报(A辑)》2007,27(5):907-914
在非紧集上证明了两类多值算子的 Hartman-Stampacchia 变分不等式, 作为应用, 讨论了多值算子的相补问题. 相似文献
73.
研究具有未知扰动的随机广义系统的故障检测问题,在合理的条件下,利用状态变换从原系统中分离出一个与未知扰动解耦的降阶子系统,构造了该随机子系统稳定的滤波器,给出了输出偏差量的统计特性,在此基础上,实现了系统故障的检测. 相似文献
74.
Periodic and almost periodic solutions of nonlinear discrete Volterra equations with unbounded delay
The existence of periodic and almost periodic solutions of nonlinear discrete Volterra equations with unbounded delay is obtained by using stability properties of a bounded solution. 相似文献
75.
Klaus DENECKE 《中国科学A辑(英文版)》2007,50(5):715-726
Let G be a finite group and S be a finite simple group. In this paper, we prove that if G and S have the same sets of all orders of solvable subgroups, then G is isomorphic to S, or G and S are isomorphic to Bn(q), Cn(q), where n≥3 and q is odd. This gives a positive answer to the problem put forward by Abe and Iiyori. 相似文献
76.
On the boundedness of solutions of the Chen system 总被引:1,自引:0,他引:1
By constructing a suitable Lyapunov function, we show that for the system parameters in some specified regions, the solutions of the Chen system are globally bounded. 相似文献
77.
In this paper, we consider a risk process with stochastic return on investments. The basic risk process is the classical risk process while the return on the investment generating process is a compound Poisson process plus a Brownian motion with positive drift. We obtain an integral equation for the ultimate ruin probability which is twice continuously differentiable under certain conditions. We then derive explicit expressions for the lower bound for the ruin probability. We also study a joint distribution related to exponential functionals of Brownian motion which is required in the derivations of the explicit expressions for the lower bound. 相似文献
78.
Let K
m,nbe a complete bipartite graph with two partite sets having m and n vertices, respectively. A K
p,q-factorization of K
m,n is a set of edge-disjoint K
p,q-factors of K
m,n which partition the set of edges of K
m,n. When p = 1 and q is a prime number, Wang, in his paper “On K
1,k
-factorizations of a complete bipartite graph” (Discrete Math, 1994, 126: 359—364), investigated the K
1,q
-factorization of K
m,nand gave a sufficient condition for such a factorization to exist. In the paper “K
1,k
-factorizations of complete bipartite graphs” (Discrete Math, 2002, 259: 301—306), Du and Wang extended Wang’s result to the
case that q is any positive integer. In this paper, we give a sufficient condition for K
m,n to have a K
p,q-factorization. As a special case, it is shown that the Martin’s BAC conjecture is true when p : q = k : (k+ 1) for any positive integer k. 相似文献
79.
We introduce first a sort of gray-scale morphological dilations and erosions, which might have some further applications in image analysis. Then we show that the dilation and the erosion defined here form adjunctive pairs. The duality between the dilation and the erosion and some other properties, such as the commuting property with translation and homothety, of these operators are discussed as well. 相似文献
80.
Let AlgL be a J-subspace lattice algebra on a Banach space X and M be an operator in AlgL. We prove that if δ : AlgL → B(X) is a linear mapping satisfying δ(AB) = δ(A)B + Aδ(B)for all A, B ∈ AlgL with AMB = 0, then δ is a generalized derivation. This result can be applied to atomic Boolean subspace lattice algebras and pentagon subspace lattice algebras. 相似文献