全文获取类型
收费全文 | 18407篇 |
免费 | 1252篇 |
国内免费 | 1895篇 |
专业分类
化学 | 853篇 |
晶体学 | 17篇 |
力学 | 638篇 |
综合类 | 286篇 |
数学 | 9406篇 |
物理学 | 2118篇 |
综合类 | 8236篇 |
出版年
2024年 | 30篇 |
2023年 | 165篇 |
2022年 | 211篇 |
2021年 | 279篇 |
2020年 | 308篇 |
2019年 | 336篇 |
2018年 | 331篇 |
2017年 | 388篇 |
2016年 | 425篇 |
2015年 | 403篇 |
2014年 | 802篇 |
2013年 | 962篇 |
2012年 | 818篇 |
2011年 | 1010篇 |
2010年 | 917篇 |
2009年 | 1173篇 |
2008年 | 1212篇 |
2007年 | 1412篇 |
2006年 | 1206篇 |
2005年 | 1086篇 |
2004年 | 898篇 |
2003年 | 912篇 |
2002年 | 812篇 |
2001年 | 683篇 |
2000年 | 722篇 |
1999年 | 613篇 |
1998年 | 579篇 |
1997年 | 507篇 |
1996年 | 406篇 |
1995年 | 294篇 |
1994年 | 299篇 |
1993年 | 234篇 |
1992年 | 194篇 |
1991年 | 181篇 |
1990年 | 160篇 |
1989年 | 141篇 |
1988年 | 113篇 |
1987年 | 71篇 |
1986年 | 36篇 |
1985年 | 39篇 |
1984年 | 33篇 |
1983年 | 13篇 |
1982年 | 28篇 |
1981年 | 16篇 |
1980年 | 19篇 |
1979年 | 19篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1976年 | 8篇 |
1936年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
211.
Ioannis K. Argyros 《Journal of Mathematical Analysis and Applications》2004,298(2):374-397
We provide a local as well as a semilocal convergence analysis for two-point Newton-like methods in a Banach space setting under very general Lipschitz type conditions. Our equation contains a Fréchet differentiable operator F and another operator G whose differentiability is not assumed. Using more precise majorizing sequences than before we provide sufficient convergence conditions for Newton-like methods to a locally unique solution of equation F(x)+G(x)=0. In the semilocal case we show under weaker conditions that our error estimates on the distances involved are finer and the information on the location of the solution at least as precise as in earlier results. In the local case a larger radius of convergence is obtained. Several numerical examples are provided to show that our results compare favorably with earlier ones. As a special case we show that the famous Newton-Kantorovich hypothesis is weakened under the same hypotheses as the ones contained in the Newton-Kantorovich theorem. 相似文献
212.
A mapping from a subset of the real axis to a metric space with finite generalized variation is shown to admit extension to a mapping of the whole real axis with the same variation. This result leads to characterization of the generalized essential variation of a mapping. 相似文献
213.
Zhangjian Hu 《Journal of Mathematical Analysis and Applications》2004,296(2):435-454
We define an extended Cesàro operator Tg with holomorphic symbol g in the unit ball B of Cn. For a large class of weights w we characterize those g for which Tg is bounded (or compact) from Bergman space Lpa,w(B) to Lqa,w(B), 0<p,q<∞. In addition, we obtain some results about equivalent norms, the norm of point evaluation functionals, and the interpolation sequences on Lpa,w(B). 相似文献
214.
In this paper, we continue the analysis of the image regularity condition (IRC) as introduced in a previous paper where we have proved that IRC implies the existence of generalized Lagrange-John multipliers with first component equal to 1. The term generalized is connected with the fact that the separation (in the image space) is not necessarily linear (when we have classic Lagrange-John multipliers), but it can be also nonlinear. Here, we prove that the IRC guarantees, also in the nondifferentiable case, the fact that 0 is a solution of the first-order homogeneized (linearized) problem obtained by means of the Dini-Hadamard derivatives. 相似文献
215.
引进集值映射的锥真拟凹概念,讨论一类具有集值映射的广义向量衡问题解的存在性与解集的凸性。 相似文献
216.
In this paper, the authors obtain the endpoint estimates for a class of non-standard commutators with higher order remainders and their variants. Moreover, the authors show that these operators are actually not bounded in certain cases.
217.
杨大春 《中国科学A辑(英文版)》2003,46(5)
This paper introduces the fractional Sobolev spaces on spaces of homogeneous type,includingmetric spaces and fractals. These Sobolev spaces include the well-known Hajfasz-Sobolev spaces as specialmodels.The author establishes varions chaaracterizations of(sharp)maximal functions for these spaces.Asapplications,the author identifies the fractional Sobolev spaces with some Lipscitz-type spaces.Moreover;some embedding theorems are also given. 相似文献
218.
Ryo Ikehata 《Journal of Mathematical Analysis and Applications》2003,288(2):803-818
We generalize a previous result of Ikehata (Math. Methods Appl. Sci., in press), which studies the critical exponent problem of a semilinear damped wave equation in the one-dimensional half space, to the general N-dimensional half space case. That is to say, one can show the small data global existence of solutions of a mixed problem for the equation utt−Δu+ut=|u|p with the power p satisfying p∗(N)=1+2/(N+1)<p?N/[N−2]+ if we deal with the problem in the N-dimensional half space. 相似文献
219.
该文给出赋0rlicz范数的Musielak-Orlicz序列空间中Gateaux可微点(光滑点)与Frechet可微点(强光滑点)的判定准则.在此基础上推出了该空间具有光滑性或强光滑性的充分必要条件. 相似文献
220.