全文获取类型
收费全文 | 11290篇 |
免费 | 801篇 |
国内免费 | 1022篇 |
专业分类
化学 | 680篇 |
晶体学 | 5篇 |
力学 | 781篇 |
综合类 | 156篇 |
数学 | 9719篇 |
物理学 | 1772篇 |
出版年
2024年 | 10篇 |
2023年 | 125篇 |
2022年 | 138篇 |
2021年 | 186篇 |
2020年 | 261篇 |
2019年 | 293篇 |
2018年 | 267篇 |
2017年 | 316篇 |
2016年 | 284篇 |
2015年 | 258篇 |
2014年 | 482篇 |
2013年 | 901篇 |
2012年 | 445篇 |
2011年 | 588篇 |
2010年 | 510篇 |
2009年 | 670篇 |
2008年 | 751篇 |
2007年 | 760篇 |
2006年 | 664篇 |
2005年 | 649篇 |
2004年 | 533篇 |
2003年 | 550篇 |
2002年 | 451篇 |
2001年 | 372篇 |
2000年 | 328篇 |
1999年 | 331篇 |
1998年 | 326篇 |
1997年 | 279篇 |
1996年 | 197篇 |
1995年 | 138篇 |
1994年 | 121篇 |
1993年 | 108篇 |
1992年 | 83篇 |
1991年 | 88篇 |
1990年 | 60篇 |
1989年 | 59篇 |
1988年 | 53篇 |
1987年 | 32篇 |
1986年 | 37篇 |
1985年 | 58篇 |
1984年 | 47篇 |
1983年 | 32篇 |
1982年 | 45篇 |
1981年 | 41篇 |
1980年 | 27篇 |
1979年 | 46篇 |
1978年 | 28篇 |
1977年 | 26篇 |
1976年 | 22篇 |
1973年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Dmitry Dolgopyat 《Transactions of the American Mathematical Society》2004,356(4):1637-1689
We consider a large class of partially hyperbolic systems containing, among others, affine maps, frame flows on negatively curved manifolds, and mostly contracting diffeomorphisms. If the rate of mixing is sufficiently high, the system satisfies many classical limit theorems of probability theory.
82.
José L. Ló pez Nico M. Temme 《Transactions of the American Mathematical Society》2004,356(11):4323-4342
Taylor expansions of analytic functions are considered with respect to several points, allowing confluence of any of them. Cauchy-type formulas are given for coefficients and remainders in the expansions, and the regions of convergence are indicated. It is explained how these expansions can be used in deriving uniform asymptotic expansions of integrals. The method is also used for obtaining Laurent expansions in several points as well as Taylor-Laurent expansions.
83.
关于任意随机变量序列泛函的强极限定理 总被引:1,自引:1,他引:0
本文在k是固定的正整数,{fn}是R^k 1上的Borel可测函数列时,得到了任意随机变量序列{Xrn≥0}的泛函{fn(Xn-k,…,Xn)}的强极限定理,它是Chung的关于独立随机变量序列的强大数律的推广,作为推论,得到了k重非齐次马尔科夫链的一类强极限定理. 相似文献
84.
§ 1. IntroductionRecently ,thedifferentialequationswithdeviatingargumentswereusuallydiscussed(see[1 ],[4],[5 ]) .In [1 ],AGARWALRPandO’REGANDconsideredequationy″(t) =f(t,y(t) ,y(σ(t) ) ) , a.e .t∈ [0 ,1 ]y(t) =ψ(t) , t∈ [-r ,0 ]y( 1 ) =a ,( )andtheydiscussedtheexistenceofatleastonesolutionforequation ( ) .Inthispaper ,weconsideramoregeneralequation-x″(t) =f(t ,xt) , t∈ [0 ,1 ]x(t) =ψ(t) , t∈ ( -∞ ,0 ]x( 0 ) =x( 1 ) =0 ,( 1 .1 )andsomeexistencetheor… 相似文献
85.
Jean-Pierre Dedieu Gregorio Malajovich Mike Shub 《Foundations of Computational Mathematics》2005,5(2):145-171
We prove a linear bound on the average total curvature of the
central path of linear programming theory in terms of the number
of independent variables of the primal problem, and independent of
the number of constraints. 相似文献
86.
多目标半定规划的互补弱鞍点和G-鞍点最优性条件 总被引:1,自引:0,他引:1
对于含矩阵函数半定约束和多个目标函数的多目标半定规划问题,给出Lagrange函数在弱有效意义下的互补弱鞍点和Geofrrion恰当有效意义下的G-鞍点的定义及其等价定义.然后,在较弱的凸性条件下,利用含矩阵和向量约束的择一性定理,建立多目标半定规划的互补弱鞍点和G-鞍点充分必要条件. 相似文献
87.
本文将在切触有理插值中起重要作用的Salzer定理推广到了多元向量的情形. 相似文献
88.
Nicholas Buchdahl 《Annals of Global Analysis and Geometry》2003,23(2):189-204
The classical conjectures of Weil on K3 surfaces – that the set of suchsurfaces is connected; that a version of the Torelli theorem holds; thateach such surface is Kähler; and that the period map issurjective – are reconsidered in the light of a generalisation of theNakai–Moishezon criterion, and short proofs of all the conjectures aregiven. Most of the proofs apply equally or with minor variation tocomplex 2-tori, the only other compact Kähler surfaces with trivialcanonical bundle. 相似文献
89.
We establish some liminf theorems on the increments of a (N,d)-Gaussian process with the usual Euclidean norm, via estimating upper bounds of large deviation probabilities on the suprema
of the (N,d)-Gaussian process.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
90.
The load-carrying capacity of circular plates made of a fiber-reinforced composite and loaded with axisymmetric transverse forces under axisymmetric boundary conditions is investigated. The plates can be freely supported or clamped along their contour. To the known yield condition used, in the plane of main bending moments, there correspond irregular hexagons, which depend on the mechanical properties of composite constituents and some characteristic geometrical parameters. It is shown that, depending on the ratio of ultimate radial and circumferential bending moments, in the plastic state, the circular plates (the central part of the clamped plates) take the form of a cone or a frustum of cone. For each of the cases, the limit load is found, which is a function of the above-mentioned mechanical parameters. The statically allowable fields of bending moments and the corresponding allowable fields of deflection rates are determined. The solutions found are exact. Special cases for the freely supported plates are analyzed, and the results obtained are presented in the form of graphs.__________Translated from Mekhanika Kompozitnykh Materialov, Vol. 41, No. 2, pp. 177–192, March–April, 2005. 相似文献