全文获取类型
收费全文 | 9410篇 |
免费 | 881篇 |
国内免费 | 1197篇 |
专业分类
化学 | 107篇 |
力学 | 392篇 |
综合类 | 204篇 |
数学 | 9339篇 |
物理学 | 1446篇 |
出版年
2024年 | 16篇 |
2023年 | 95篇 |
2022年 | 104篇 |
2021年 | 139篇 |
2020年 | 205篇 |
2019年 | 259篇 |
2018年 | 260篇 |
2017年 | 280篇 |
2016年 | 305篇 |
2015年 | 205篇 |
2014年 | 443篇 |
2013年 | 724篇 |
2012年 | 397篇 |
2011年 | 542篇 |
2010年 | 512篇 |
2009年 | 718篇 |
2008年 | 687篇 |
2007年 | 724篇 |
2006年 | 643篇 |
2005年 | 568篇 |
2004年 | 463篇 |
2003年 | 500篇 |
2002年 | 468篇 |
2001年 | 312篇 |
2000年 | 350篇 |
1999年 | 320篇 |
1998年 | 279篇 |
1997年 | 265篇 |
1996年 | 168篇 |
1995年 | 87篇 |
1994年 | 75篇 |
1993年 | 49篇 |
1992年 | 44篇 |
1991年 | 31篇 |
1990年 | 23篇 |
1989年 | 18篇 |
1988年 | 20篇 |
1987年 | 11篇 |
1986年 | 5篇 |
1985年 | 17篇 |
1984年 | 34篇 |
1983年 | 14篇 |
1982年 | 28篇 |
1981年 | 16篇 |
1980年 | 23篇 |
1979年 | 12篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1936年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
101.
Deguang Han 《应用数学学报(英文版)》1994,10(2):213-219
In this paper we will prove some theorems on theM-ideals of compact operators and the best approximation of quasitriangular operator algebras. These results improve and extend the known results in [4, 5, 7].This work is supported in part by the National Natural Science Foundation of China. 相似文献
102.
一类广义维里拉普拉斯,把在白噪声分析构架中通常定义的维里拉普拉斯作为特殊情形而包含。 相似文献
103.
A multidimensional version of the first Darboux problem is considered for a model second-order degenerating hyperbolic equation. Using the technique of functional spaces with a negative norm, the correct formulation of this problem in the Sobolev weighted space is proved. 相似文献
104.
AClassofCauchyProblemforQuasilinearHyperbolicSystemswiththeWeaklyDissipativeTerms¥LiuFagui;YangQiao(NorthChinaInstituteofWate... 相似文献
105.
FIXEDPOINTSANDCOUPLEDFIXEDPOINTSFORINCREASINGOPERATORSWITHAPPLICMIONSTODIFFERENTIALINCLUSIONSINBANACHSPACESZHANGSHISHENGANDHU... 相似文献
106.
Esa Nummelin 《Journal of Theoretical Probability》1994,7(4):739-756
The paper is concerned with characterization results for distributional regeneration. It is shown that distributional regeneration is equivalent to renewal representation of the associated (shift) Markov operator. A sufficient condition for the distributional regeneration of the transfer operator in terms of variation is also formulated. Finally, a minorization condition is formulated and proved to be sufficient for recurrent co-Feller operators. 相似文献
107.
Lei Liu 《Journal of Mathematical Analysis and Applications》2007,328(2):1484-1486
In this note, we generalize the inequality about the trace of positive semidefinite matrix trk(AB)?k(trA)k(trB) to Hilbert space, and obtain a relevant inequality about positive trace class operator. 相似文献
108.
Roberta Filippucci 《Journal of Mathematical Analysis and Applications》2007,334(1):604-620
In this paper we study first nonexistence of radial entire solutions of elliptic systems of the mean curvature type with a singular or degenerate diffusion depending on the solution u. In particular we extend a previous result given in [R. Filippucci, Nonexistence of radial entire solutions of elliptic systems, J. Differential Equations 188 (2003) 353-389]. Moreover, in the scalar case we obtain nonexistence of all entire solutions, radial or not, of differential inequalities involving again operators of the mean curvature type and a diffusion term. We prove that in the scalar case, nonexistence of entire solutions is due to the explosion of the derivative of every nonglobal radial solution in the right extremum of the maximal interval of existence, while in that point the solution is bounded. This behavior is qualitatively different with respect to what happens for the m-Laplacian operator, studied in [R. Filippucci, Nonexistence of radial entire solutions of elliptic systems, J. Differential Equations 188 (2003) 353-389], where nonexistence of entire solutions is due, even in the vectorial case, to the explosion in norm of the solution at a finite point. Our nonexistence theorems for inequalities extend previous results given by Naito and Usami in [Y. Naito, H. Usami, Entire solutions of the inequality div(A(|Du|)Du)?f(u), Math. Z. 225 (1997) 167-175] and Ghergu and Radulescu in [M. Ghergu, V. Radulescu, Existence and nonexistence of entire solutions to the logistic differential equation, Abstr. Appl. Anal. 17 (2003) 995-1003]. 相似文献
109.
多线性Calderón-Zygmund算子的加权有界性 总被引:2,自引:0,他引:2
建立了多线性Calderón-Zygmund算子在比幂权空间更一般的Herz空间和Herz型Hardy空间上的有界性.作为推论,得到了该算子的幂权估计.在这些幂权估计中,权指标可以突破Ap权的指标限制,显示出和经典Calderón-Zygmund算子本质的区别. 相似文献
110.
On the harmonic Bergman space of the half-space, we give characterizations for an arbitrary positive Toeplitz operator to
be a Schatten (or Schatten-Herz) class operator in terms of averaging functions and Berezin transforms. Examples are provided
to show that various results are sharp.
This research was supported by KOSEF(R01-2003-000-10243-0). 相似文献