全文获取类型
收费全文 | 12430篇 |
免费 | 1347篇 |
国内免费 | 1294篇 |
专业分类
化学 | 3049篇 |
晶体学 | 70篇 |
力学 | 1082篇 |
综合类 | 207篇 |
数学 | 7018篇 |
物理学 | 3645篇 |
出版年
2024年 | 16篇 |
2023年 | 121篇 |
2022年 | 175篇 |
2021年 | 206篇 |
2020年 | 302篇 |
2019年 | 275篇 |
2018年 | 307篇 |
2017年 | 392篇 |
2016年 | 432篇 |
2015年 | 274篇 |
2014年 | 558篇 |
2013年 | 902篇 |
2012年 | 650篇 |
2011年 | 658篇 |
2010年 | 519篇 |
2009年 | 733篇 |
2008年 | 789篇 |
2007年 | 824篇 |
2006年 | 737篇 |
2005年 | 690篇 |
2004年 | 573篇 |
2003年 | 585篇 |
2002年 | 539篇 |
2001年 | 491篇 |
2000年 | 422篇 |
1999年 | 405篇 |
1998年 | 341篇 |
1997年 | 310篇 |
1996年 | 278篇 |
1995年 | 226篇 |
1994年 | 176篇 |
1993年 | 109篇 |
1992年 | 150篇 |
1991年 | 135篇 |
1990年 | 105篇 |
1989年 | 76篇 |
1988年 | 69篇 |
1987年 | 71篇 |
1986年 | 61篇 |
1985年 | 67篇 |
1984年 | 50篇 |
1983年 | 30篇 |
1982年 | 37篇 |
1981年 | 37篇 |
1980年 | 33篇 |
1979年 | 35篇 |
1978年 | 23篇 |
1977年 | 19篇 |
1976年 | 17篇 |
1973年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 781 毫秒
11.
Lisa Lorentzen 《Numerical Algorithms》1995,10(1):69-111
Over the last 20 years a large number of algorithms has been published to improve the speed and domain of convergence of continued fractions. In this survey we show that these algorithms are strongly related. Actually, they essentially boil down to two main principles.We also prove some results on asymptotic expansions of tail values of limit periodic continued fractions.Dedicated to Luigi Gatteschi on his seventieth birthdayThis research was partially supported by The Norwegian Research Council and by the HMC project ROLLS, under contract CHRX-CT93-0416. 相似文献
12.
A likelihood-based method for haplotype association studies of case-control data with genotyping uncertainty 总被引:1,自引:0,他引:1
ZHU Wensheng & GUO Jianhua School of Mathematics Statistics Northeast Normal University Changchun China 《中国科学A辑(英文版)》2006,49(1):130-144
This paper discusses the associations between traits and haplotypes based on Fl (fluorescent intensity) data sets. We consider a clustering algorithm based on mixtures of t distributions to obtain all possible genotypes of each individual (i.e. "GenoSpec-trum"). We then propose a likelihood-based approach that incorporates the genotyping uncertainty to assessing the associations between traits and haplotypes through a haplotype-based logistic regression model. Simulation studies show that our likelihood-based method can reduce the impact induced by genotyping errors. 相似文献
13.
LIU Jixue ZHANG Sanguo & CHEN Xiru Department of Statistics Finance University of Science Technology of China Hefei China Department of Mathematics Graduate School of Chinese Academy of Sciences Beijing China 《中国科学A辑(英文版)》2006,49(6):752-769
This paper studies the linear EV model when replicate observations are made only on independent variables. We construct the estimates of regression coefficients and prove the consistency and asymptotic normality under some proper conditions. Results obtained reveal the difference between the case where the independent and dependent variables are observed repeatedly and simultaneously and the case studied in this article. 相似文献
14.
Blaise Faugeras Jé rô me Pousin Franck Fontvieille. 《Mathematics of Computation》2006,75(253):209-222
A numerical scheme based on an operator splitting method and a dense output event location algorithm is proposed to integrate a diffusion-dissolution/precipitation chemical initial-boundary value problem with jumping nonlinearities. The numerical analysis of the scheme is carried out and it is proved to be of order 2 in time. This global order estimate is illustrated numerically on a test case.
15.
16.
关于AOR迭代法的研究 总被引:5,自引:0,他引:5
陈恒新 《应用数学与计算数学学报》2002,16(1):40-46
本文论证了严格对角占优矩阵之AOR法的误差估计式中的误差估计常数hγ,ω(0≤γ≤ω0)的最小值是h1,1. 相似文献
17.
E. A. Bailov N. Temirgaliev 《Computational Mathematics and Mathematical Physics》2006,46(9):1515-1525
Sharp estimates (in the power scale) are obtained for the discretization error in the solutions to Poisson’s equation whose right-hand side belongs to a Korobov class. Compared to the well-known Korobov estimate, the order is almost doubled and has an ultimate value in the power scale. 相似文献
18.
《组合设计杂志》2002,10(5):283-293
An Orthogonal Double Cover (ODC) of the complete graph Kn by an almost‐hamiltonian cycle is a decomposition of 2Kn into cycles of length n?1 such that the intersection of any two of them is exactly one edge. We introduce a new class of such decompositions. If n is a prime, the special structure of such a decomposition allows to expand it to an ODC of Kn+1 by an almost‐hamiltonian cycle. This yields the existence of an ODC of Kp+1 by an almost‐hamiltonian cycle for primes p of order 3 mod 4 and its eventual existence for arbitrary primes p. © 2002 Wiley Periodicals, Inc. J Combin Designs 10: 283–293, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/jcd.10011 相似文献
19.
20.
曾六川 《数学年刊A辑(中文版)》2002,(6)
设X是p一致凸Banach空间,具有弱一致正规结构与非严格的Opial性质.又设C是X的非空凸弱紧子集.在适当的条件下,证明了C上每个渐近正则半群T={T(t):t∈S}都有不动点进一步,在类似的条件下,也讨论了一致凸Banach空间中渐近正则半群的不动点的存在性. 相似文献