全文获取类型
收费全文 | 1324篇 |
免费 | 51篇 |
国内免费 | 186篇 |
专业分类
力学 | 12篇 |
综合类 | 20篇 |
数学 | 1501篇 |
物理学 | 28篇 |
出版年
2024年 | 2篇 |
2023年 | 10篇 |
2022年 | 9篇 |
2021年 | 9篇 |
2020年 | 19篇 |
2019年 | 17篇 |
2018年 | 41篇 |
2017年 | 49篇 |
2016年 | 32篇 |
2015年 | 8篇 |
2014年 | 36篇 |
2013年 | 190篇 |
2012年 | 39篇 |
2011年 | 43篇 |
2010年 | 57篇 |
2009年 | 108篇 |
2008年 | 100篇 |
2007年 | 67篇 |
2006年 | 77篇 |
2005年 | 64篇 |
2004年 | 60篇 |
2003年 | 80篇 |
2002年 | 76篇 |
2001年 | 55篇 |
2000年 | 59篇 |
1999年 | 49篇 |
1998年 | 57篇 |
1997年 | 42篇 |
1996年 | 33篇 |
1995年 | 17篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1982年 | 6篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1936年 | 1篇 |
排序方式: 共有1561条查询结果,搜索用时 36 毫秒
171.
Strong convergence of Krasnoselskii and Mann's type sequences for one-parameter nonexpansive semigroups without Bochner integrals 总被引:3,自引:0,他引:3
Tomonari Suzuki 《Journal of Mathematical Analysis and Applications》2005,305(1):227-239
In this paper, we prove Krasnoselskii and Mann's type convergence theorems for nonexpansive semigroups without using Bochner integral and without assuming the strict convexity of Banach spaces. One of our main results is the following: let C be a compact convex subset of a Banach space E and let be a one-parameter strongly continuous semigroup of nonexpansive mappings on C. Let {tn} be a sequence in [0,∞) satisfying
172.
173.
174.
175.
Volker Runde 《Transactions of the American Mathematical Society》2006,358(1):391-402
Let be a locally compact group, and let denote the space of weakly almost periodic functions on . We show that, if is a -group, but not compact, then the dual Banach algebra does not have a normal, virtual diagonal. Consequently, whenever is an amenable, non-compact -group, is an example of a Connes-amenable, dual Banach algebra without a normal, virtual diagonal. On the other hand, there are amenable, non-compact, locally compact groups such that does have a normal, virtual diagonal.
176.
《Mathematical Methods in the Applied Sciences》2018,41(1):438-456
This paper deals with a stochastic system which models the population dynamics of a chemostat including species death rate. On the basis of the theory on Markov semigroup, we demonstrate that the probability densities of the distributions for the solutions are absolutely continuous. The densities will convergence in L1 to an invariant density or weakly convergence to a singular measure under appropriate conditions. We also give the sufficient criteria for extinction exponentially of the species. To be specific, when D1>D and the strength of perturbation is relatively small, we derive a precise threshold for the species survival. 相似文献
177.
Michael Röckner Weina Wu Yingchao Xie 《Stochastic Processes and their Applications》2018,128(6):2131-2151
We prove the existence and uniqueness of probabilistically strong solutions to stochastic porous media equations driven by time-dependent multiplicative noise on a general measure space , and the Laplacian replaced by a negative definite self-adjoint operator . In the case of Lipschitz nonlinearities , we in particular generalize previous results for open and Laplacian to fractional Laplacians. We also generalize known results on general measure spaces, where we succeeded in dropping the transience assumption on , in extending the set of allowed initial data and in avoiding the restriction to superlinear behavior of at infinity for -initial data. 相似文献
178.
Michael P. Drazin 《Linear and Multilinear Algebra》2018,66(1):184-192
179.
Matthew M. Lin 《Linear and Multilinear Algebra》2018,66(7):1279-1298
This work is to propose an iterative method of choice to compute a stable subspace of a regular matrix pencil. This approach is to define a sequence of matrix pencils via particular left null spaces. We show that this iteration preserves a semigroup property depending only on the initial matrix pencil. Via this recursion relationship, we propose an accelerated iterative method to compute the stable subspace and use it to provide a theoretical result to solve the principal square root of a given matrix, both nonsingular and singular. We show that this method can not only find out the matrix square root, but also construct an iterative approach which converges to the square root with any desired order. 相似文献
180.
Existence and Blowup of Solutions for Neutral Partial Integro-differential Equations with State-dependent Delay
下载免费PDF全文
![点击此处可从《Journal of Nonlinear Modeling and Analysis》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In this paper, we study the existence and blowup of solutions for a neutral partial functional integro-differential equation with state-dependent delay in Banach space. The mild solutions are obtained by Sadovskii fixed point theorem under compactness condition for the resolvent operator, the theory of fractional power and α-norm are also used in the discussion since
the nonlinear terms of the system involve spacial derivatives. The strong
solutions are obtained under the lipschitz condition. In addition, based on the
local existence result and a piecewise extended method, we achieve a blowup
alternative result as well for the considered equation. Finally, an example is
provided to illustrate the application of the obtained results. 相似文献