全文获取类型
收费全文 | 6637篇 |
免费 | 397篇 |
国内免费 | 846篇 |
专业分类
化学 | 99篇 |
晶体学 | 1篇 |
力学 | 156篇 |
综合类 | 109篇 |
数学 | 7247篇 |
物理学 | 268篇 |
出版年
2024年 | 9篇 |
2023年 | 107篇 |
2022年 | 62篇 |
2021年 | 83篇 |
2020年 | 113篇 |
2019年 | 167篇 |
2018年 | 182篇 |
2017年 | 179篇 |
2016年 | 183篇 |
2015年 | 140篇 |
2014年 | 268篇 |
2013年 | 512篇 |
2012年 | 212篇 |
2011年 | 331篇 |
2010年 | 320篇 |
2009年 | 461篇 |
2008年 | 497篇 |
2007年 | 502篇 |
2006年 | 454篇 |
2005年 | 406篇 |
2004年 | 328篇 |
2003年 | 325篇 |
2002年 | 312篇 |
2001年 | 234篇 |
2000年 | 250篇 |
1999年 | 240篇 |
1998年 | 201篇 |
1997年 | 201篇 |
1996年 | 127篇 |
1995年 | 72篇 |
1994年 | 70篇 |
1993年 | 29篇 |
1992年 | 30篇 |
1991年 | 25篇 |
1990年 | 18篇 |
1989年 | 7篇 |
1988年 | 18篇 |
1987年 | 6篇 |
1986年 | 11篇 |
1985年 | 20篇 |
1984年 | 24篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 13篇 |
1980年 | 23篇 |
1979年 | 20篇 |
1978年 | 19篇 |
1977年 | 14篇 |
1976年 | 7篇 |
1974年 | 4篇 |
排序方式: 共有7880条查询结果,搜索用时 26 毫秒
61.
62.
Hirofumi Tsumura. 《Mathematics of Computation》2004,73(245):251-258
In this paper, we give some evaluation formulas for Tornheim's type of alternating series by an elementary and combinatorial calculation of the uniformly convergent series. Indeed, we list several formulas for them by means of Riemann's zeta values at positive integers.
63.
In this paper, we exhibit a unified treatment of the mixed initial boundary value problem for second order (in time) parabolic linear differential equations in Banach spaces, whose boundary conditions are of a dynamical nature. Results regarding existence, uniqueness, continuous dependence (on initial data) and regularity of classical and strict solutions are established. Moreover, several examples are given as samples for possible applications.
64.
§ 1. Introduction Anecessaryandsufficientconditionandasufficientconditiontoensurethataset valuedmappingandasingle valuedmappinginacompletemetricspaceandacompleteconvexmetricspacehavingacommonfixedpointarerespectivelygivenin [1 ] .Meanwhilethemainresultsin[2 ]— [5]areimprovedandextendedin [1 ] .Inthispaper ,theexistenceatcommonfixedpointsoftwoset valuedmappingandasing valuedmappingwerestudied ,andthecorrespond ingresultsin [1 ]— [5]wereextendedandimproved .Let(X ,d)beanon emptymetricspa… 相似文献
65.
Chi-Kwong Li Ilya M. Spitkovsky 《Journal of Mathematical Analysis and Applications》2003,282(1):329-340
Existence of the fractional powers is established in Banach algebra setting, in terms of the numerical ranges of elements involved. The behavior of the spectra and (for Hermitian ∗-algebras satisfying some additional hypotheses) the ∗-numerical range under taking these powers also is investigated. 相似文献
66.
Regularity of Harmonic Functions in Cheeger-Type Sobolev Spaces 总被引:3,自引:0,他引:3
We give a geometric approach to the study of the regularity of harmonic functions in Cheeger-type Sobolev spaces, and prove the Hölder continuity of such functions. In the proof, we give a definition of an upper curvature bound of the unit sphere of a Banach space, which seems to be of independent interest. 相似文献
67.
The notion of a fuzzy retract was introduced by Rodabaugh (1981). The notion of a fuzzy pairwise retract was introduced in 2001. Some weak forms and some strong forms of α-continuous mappings were introduced in 1988 and 1997. The authors extend some of these forms to the L-fuzzy bitopological setting and construct various α-fuzzy pairwise retracts. The concept of weakly induced spaces in the case L = [0,1] was introduced by Martin (1980). Liu and Luo (1987) generalized this notion to the case that L is an arbitrary F-lattice and introduced the notion of induced L-fts. Several results are obtained, especially, for L-valued pairwise stratification spaces. 相似文献
68.
刘继成 《数学物理学报(B辑英文版)》2004,24(2)
Let X be a two parameter smooth semimartingale and (~X) be its process of the product variation. It is proved that (~X) can be approximated as D∞-limit of sums of its discrete product variations as the mesh of division tends to zero. Moreover, this result can be strengthen to yield the quasi sure convergence of sums by estimating the speed of the convergence. 相似文献
69.
In this paper, the authors study the inclusion relations between Dirichlet type spaces DT and α-Bloch spacesβα by means of higher radial derivative. The strictness and the best possibility of the inclusion relations are shown with constructive methods.Furthermore, they sharpen one of the results when T = n, which proves that a conjecture in [7] is true. 相似文献
70.
Yen-Shung TSAI 《中国科学A辑(英文版)》2007,50(7):1026-1034
By means of further investigation of solid codes,the problem“Is every fd-domain uni- formly dense”proposed by Yuqi Guo,C.M.Reis and G.Thierrin in 1988 is solved in this paper. 相似文献