全文获取类型
收费全文 | 1814篇 |
免费 | 131篇 |
国内免费 | 161篇 |
专业分类
化学 | 39篇 |
力学 | 247篇 |
综合类 | 56篇 |
数学 | 1520篇 |
物理学 | 244篇 |
出版年
2024年 | 3篇 |
2023年 | 19篇 |
2022年 | 14篇 |
2021年 | 29篇 |
2020年 | 31篇 |
2019年 | 41篇 |
2018年 | 35篇 |
2017年 | 51篇 |
2016年 | 46篇 |
2015年 | 51篇 |
2014年 | 95篇 |
2013年 | 90篇 |
2012年 | 66篇 |
2011年 | 111篇 |
2010年 | 99篇 |
2009年 | 106篇 |
2008年 | 115篇 |
2007年 | 118篇 |
2006年 | 120篇 |
2005年 | 127篇 |
2004年 | 73篇 |
2003年 | 77篇 |
2002年 | 81篇 |
2001年 | 80篇 |
2000年 | 67篇 |
1999年 | 68篇 |
1998年 | 40篇 |
1997年 | 52篇 |
1996年 | 45篇 |
1995年 | 36篇 |
1994年 | 27篇 |
1993年 | 21篇 |
1992年 | 14篇 |
1991年 | 4篇 |
1990年 | 12篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有2106条查询结果,搜索用时 15 毫秒
91.
The problem is studied of reducing the amount of discrete information required for achieving a prescribed accuracy of solving Fredholm integral equations of the first kind on a half-line. The equations are solved by the finite-section method combined with piecewise constant interpolation of the kernel and the right-hand side at uniform grid points. The approximating properties of the discretization schemes are examined, and the corresponding computational costs are analyzed. 相似文献
92.
The geometric characterization identifies the sets of nodes such that the Lagrange polynomials are products of factors of
first degree. We offer a detailed classification of all known sets satisfying the geometric characterization in the plane.
The defect, which takes into account the number of lines containing more nodes than the degree, plays a fundamental role in
this classification.
Partially supported by the Spanish Research Grant MTM2006-03388, by Gobierno de Aragón and Fondo Social Europeo. 相似文献
93.
有理插值问题不适定的根本原因 总被引:2,自引:2,他引:0
盛中平 《高等学校计算数学学报》2001,23(3):227-236
1 在 Rm,n中的有理插值问题本文记 Pn为次数不超过 n的一元多项式函数类 ,约定零多项式的次数为 -∞ ,即deg(0 ) =-∞ ;记 Rm,n为分子属于 Pm,分母属于 Pn\{ 0 }的一元有理函数类 .对既约分式Am/Bn∈Rm,n,如果 Bn满足尾项规范条件 (即 Wuytack条件 ) [2 ] ,则称其为标准既约分式 .引进一个新的有理函数类 ,记Rl =Rl- 1 ,0 ∪ Rl- 2 ,1 ∪…∪ R0 ,l- 1 .称 Rl 是自由度为 l的一元有理函数类 .并称其中有理函数类 Rl- 1 - i,i为有理函数类 Rl 的基本子类 ,(i=0 ,1 ,… ,l-1 ) .我们约定 :本文中“有理插值问题”如不特殊声明 ,系指文… 相似文献
94.
The purpose of this work is to describe an abstract theory of Hardy-Sobolev spaces on doubling Riemannian manifolds via an atomic decomposition. We study the real interpolation of these spaces with Sobolev spaces and finally give applications to Riesz inequalities. 相似文献
95.
We give a Newton type rational interpolation formula (Theorem 2.2). It contains as a special case the original Newton interpolation, as well as the interpolation formula of Liu, which allows to recover many important classical q-series identities. We show in particular that some bibasic identities are a consequence of our formula. 相似文献
96.
It is applied the interpolation procedure to calculate the stationary probability distribution of colored-gain-noise model of a single-mode dye laser which operates above threshold with correlation time τ covering a very wide rang. By use of Stochastic Runge-Kutta Algorithm, it also has carried out numerical simulations of the steady-state properties. Comparing the results of the interpolation procedure and the unified colored-noise approximation with simulation results, the agreement between the results of the interpolation procedure and simulation results is much better than that of the unified colored-noise approximation when correlation time τ covers range from moderate to large. 相似文献
97.
Flavia Ventriglia 《Rendiconti del Circolo Matematico di Palermo》2008,57(2):203-212
We introduce asymptotically exhaustive functions defined on Vitali Spaces with values in a Hausdorff commutative topological
group and we prove for them some classical convergence theorems.
This article was supported by MURST, project “Analisi Reale” 相似文献
98.
Abstract. We propose C
1
Hermite interpolants generated by the general subdivision scheme introduced by Merrien [17] and satisfying monotonicity
or convexity constraints. For arbitrary values and slopes of a given function f at the end-points of a bounded interval, which are compatible with the contraints, the given algorithms construct shape-preserving
interpolants. Moreover, these algorithms are quite simple and fast as well as adapted to CAGD. We also give error estimates
in the case of interpolation of smooth functions. 相似文献
99.
Quasi-interpolation is very useful in the study of the approximation theory and its applications, since the method can yield solutions directly and does not require solving any linear system of equations. However, quasi-interpolation is usually discussed only for gridded data in the literature. In this paper we shall introduce a generalized Strang–Fix condition, which is related to nonstationary quasi-interpolation. Based on the discussion of the generalized Strang–Fix condition we shall generalize our quasi-interpolation scheme for multivariate scattered data, too.
AMS subject classification 41A63, 41A25, 65D10Zong Min Wu: Supported by NSFC No. 19971017 and NOYG No. 10125102. 相似文献
100.
The application of light sectioning to the accurate measurement of a rail cross-section, from a train moving at high speed, is described. The intensity distribution through the thickness of the illuminating light sheet is deliberately graded, allowing the shape of the object to be recovered more accurately by interpolation of the sampled image. Rail profiles are extracted with a definition approximately ten-times better than that of the sampled image. 相似文献