全文获取类型
收费全文 | 3078篇 |
免费 | 140篇 |
国内免费 | 265篇 |
专业分类
化学 | 69篇 |
力学 | 64篇 |
综合类 | 41篇 |
数学 | 2987篇 |
物理学 | 322篇 |
出版年
2024年 | 3篇 |
2023年 | 37篇 |
2022年 | 44篇 |
2021年 | 58篇 |
2020年 | 100篇 |
2019年 | 90篇 |
2018年 | 83篇 |
2017年 | 86篇 |
2016年 | 95篇 |
2015年 | 65篇 |
2014年 | 112篇 |
2013年 | 291篇 |
2012年 | 77篇 |
2011年 | 170篇 |
2010年 | 147篇 |
2009年 | 197篇 |
2008年 | 211篇 |
2007年 | 201篇 |
2006年 | 167篇 |
2005年 | 162篇 |
2004年 | 114篇 |
2003年 | 149篇 |
2002年 | 124篇 |
2001年 | 101篇 |
2000年 | 104篇 |
1999年 | 95篇 |
1998年 | 83篇 |
1997年 | 79篇 |
1996年 | 62篇 |
1995年 | 32篇 |
1994年 | 24篇 |
1993年 | 15篇 |
1992年 | 7篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 14篇 |
1988年 | 5篇 |
1987年 | 12篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1936年 | 2篇 |
排序方式: 共有3483条查询结果,搜索用时 15 毫秒
991.
Roderick WONG 《数学年刊B辑(英文版)》2007,28(1):1-34
In this paper, we study the asymptotics of the Krawtchouk polynomials KnN(z;p,q) as the degree n becomes large. Asymptotic expansions are obtained when the ratio of the parameters n/N tends to a limit c∈(0,1) as n→∞. The results are globally valid in one or two regions in the complex z-plane depending on the values of c and p; in particular, they are valid in regions containing the interval on which these polynomials are orthogonal. Our method is based on the Riemann-Hilbert approach introduced by Deift and Zhou. 相似文献
992.
Vanessa Bertoni 《Journal of Mathematical Analysis and Applications》2007,332(1):418-427
Two sequences of polynomials are studied. One satisfies a three term recurrence relation for specific parameters and another a para-orthogonality property. Using the fact that these polynomials have their zeros lying on the unit circle and some other properties, we establish a criterion in order that the polynomials be univalent in the open unit disk. 相似文献
993.
Hamza Chaggara 《Journal of Mathematical Analysis and Applications》2007,332(1):11-21
In this paper, we use operational rules associated with three operators corresponding to a generalized Hermite polynomials introduced by Szegö to derive, as far as we know, new proofs of some known properties as well as new expansions formulae related to these polynomials. 相似文献
994.
Claude Lefèvre 《Methodology and Computing in Applied Probability》2007,9(2):243-262
This paper provides a review of recent results, most of them published jointly with Ph. Picard, on the exact distribution
of the first crossing of a Poisson or discrete compound Poisson process through a given nondecreasing boundary, of curved
or linear shape. The key point consists in using an underlying polynomial structure to describe the distribution, the polynomials
being of generalized Appell type for an upper boundary and of generalized Abel–Gontcharoff type for a lower boundary. That
property allows us to obtain simple and efficient recursions for the numerical determination of the distribution.
相似文献
995.
Giorgio Mantica 《Numerical Algorithms》2007,45(1-4):269-281
Measures generated by Iterated Function Systems can be used in place of atomic measures in Gaussian integration. A stable
algorithm for the numerical solution of the related approximation problem – an inverse problem in fractal construction – is
proposed.
Dedicated to Walter Gautschi. 相似文献
996.
本文在Bergman空间Bqp(p>0,q>1)中得到了关于用多项式逼近该空间函数的最佳逼近误差的阶的估计的逆定理. 相似文献
997.
B. Z. Shavarovskii 《Computational Mathematics and Mathematical Physics》2006,46(8):1283-1292
A certain standard form is found for a complex matrix with respect to equivalent transformations by quasi-diagonal matrices. The solvability of certain matrix equations in the rings of quasi-diagonal matrices is examined using this standard form. 相似文献
998.
Saralees Nadarajah 《Journal of Mathematical Analysis and Applications》2007,334(2):1492-1494
Two elegant representations are derived for the modified Chebyshev polynomials discussed by Witula and Slota [R. Witula, D. Slota, On modified Chebyshev polynomials, J. Math. Anal. Appl. 324 (2006) 321-343]. 相似文献
999.
Zhi Yuan HUANG Pei Yan LI Ying WU 《数学学报(英文版)》2008,24(2):201-214
The classical Levy-Meixner polynomials are distinguished through the special forms of their generating functions. In fact, they are completely determined by 4 parameters: c1, c2,γ and β. In this paper, for-1 〈q〈 1, we obtain a unified explicit form of q-deformed Levy-Meixner polynomials and their generating functions in term of c1, c2, γand β, which is shown to be a reasonable interpolation between classical case (q=1) and fermionic case (q=-1).In particular, when q=0 it's also compatible with the free case. 相似文献
1000.
Among the bivariate polynomials over a finite field, most are irreducible. We count some classes of special polynomials, namely the reducible ones, those with a square factor, the “relatively irreducible” ones which are irreducible but factor over an extension field, and the singular ones, which have a root at which both partial derivatives vanish. 相似文献