全文获取类型
收费全文 | 11031篇 |
免费 | 1502篇 |
国内免费 | 647篇 |
专业分类
化学 | 1283篇 |
晶体学 | 95篇 |
力学 | 3714篇 |
综合类 | 165篇 |
数学 | 3147篇 |
物理学 | 4776篇 |
出版年
2024年 | 16篇 |
2023年 | 80篇 |
2022年 | 228篇 |
2021年 | 293篇 |
2020年 | 304篇 |
2019年 | 243篇 |
2018年 | 253篇 |
2017年 | 375篇 |
2016年 | 454篇 |
2015年 | 354篇 |
2014年 | 474篇 |
2013年 | 686篇 |
2012年 | 577篇 |
2011年 | 682篇 |
2010年 | 529篇 |
2009年 | 644篇 |
2008年 | 648篇 |
2007年 | 699篇 |
2006年 | 715篇 |
2005年 | 615篇 |
2004年 | 528篇 |
2003年 | 496篇 |
2002年 | 461篇 |
2001年 | 414篇 |
2000年 | 353篇 |
1999年 | 320篇 |
1998年 | 277篇 |
1997年 | 231篇 |
1996年 | 189篇 |
1995年 | 175篇 |
1994年 | 146篇 |
1993年 | 105篇 |
1992年 | 89篇 |
1991年 | 76篇 |
1990年 | 79篇 |
1989年 | 34篇 |
1988年 | 41篇 |
1987年 | 47篇 |
1986年 | 34篇 |
1985年 | 39篇 |
1984年 | 31篇 |
1983年 | 11篇 |
1982年 | 23篇 |
1981年 | 9篇 |
1980年 | 12篇 |
1979年 | 19篇 |
1978年 | 19篇 |
1977年 | 13篇 |
1976年 | 15篇 |
1974年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Paolo Dai Pra 《Journal of statistical physics》1994,76(5-6):1247-1265
We develop an empirical test aimed at detecting nonergodicity from a single sample of a spin system. We show that the test is asymptotically correct, and we give explicit asymptotics for the error probability. The key tool consists in some new large-deviation estimates. 相似文献
972.
Simos Meintanis George Iliopoulos 《Annals of the Institute of Statistical Mathematics》2003,55(1):137-151
In this paper a class of goodness-of-fit tests for the Rayleigh distribution is proposed. The tests are based on a weighted
integral involving the empirical Laplace transform. The consistency of the tests as well as their asymptotic distribution
under the null hypothesis are investigated. As the decay of the weight function tends to infinity the test statistics approach
limit values. In a particular case the resulting limit statistic is related to the first nonzero component of Neyman’s smooth
test for this distribution. The new tests are compared with other omnibus tests for the Rayleigh distribution. 相似文献
973.
The estimation problems for the conventional step-up method (the observed breakdown voltages are not given at all) and the new step-up method (some of the observed breakdown voltages are given) are analyzed when the underlying probability distribution (of breakdown voltage level) is assumed to be gumbel distributions for minima and maxima. The new step-up test method has advantages compared to the conventional method: (1) the confidence intervals of the estimates become smaller and (2) the estimates can be obtained with higher probability. In some case of real step-up breakdown voltage test, a fit of the gumbel distribution to the data case is found to be superior to that of the normal distribution, which suggests the usefulness of the gumbel distribution for the underlying distribution in the step-up breakdown voltage test. 相似文献
974.
975.
We describe a new parallel method for solving global optimization problems. The formulation of the decision rules of this method is presented. We examine convergence conditions of the proposed algorithm and establish conditions which guarantee a considerable speedup with respect to the sequential version of the algorithm. We also present some numerical experiments executed on Alliant FX/80 for one class of multiextremal functions.The authors are greatly indebted to R. G. Strongin who stimulated the fulfillment of this research. They also would like to thank the anonymous referees for their useful suggestions.The research of the first author was partially supported by Grant 9494/NC/89 from the Italian Government under the Italian-Soviet Agreement about the Cultural and Scientific Exchange in 1990–1991. He thanks the Systems Department, University of Calabria, where he was a Visitor. 相似文献
976.
977.
We describe an automatic quadrature routine which is specifically designed for real functions having a certain type of infinite oscillating tails. The algorithm is designed to integrate a vector function over an infinite interval. A FORTRAN implementation of the algorithm is included.The algorithm combines an adaptive subdivision strategy with extrapolation and requires that the decay of all the functions in the vector is the same. The algorithm is based on the assumption that the oscillating behavior is due to a periodic function with the property that it changes sign when evaluated at points of distance half a period. We assume that this period is known. The algorithm offers a choice of three different quasi-linear extrapolation procedures, namely the Euler transformation and two modifications of this transformation.This work was supported by The Norwegian Research Council for Science and the Humanities. 相似文献
978.
979.
计算物理前沿及其与计算技术的交叉 总被引:2,自引:0,他引:2
计算物理学是随着计算技术发展而形成的一门新兴的交叉学科。它是用现代计算技术武装起来的“实验的”理论物理学和“虚拟的”实验物理学。文章回顾了计算物理的发展历史,介绍了计算物理研究状况和前沿问题,并展望了新世纪计算物理面临的挑战。 相似文献
980.
金融资产收益分布的混合高斯分析 总被引:3,自引:0,他引:3
本文研究了金融资产收益的混合高斯分布模型 ,给出了混合高斯分布的 Kolmogorov-Smirnov检验的方法 ,分析了金融资产收益的非高斯性及市场价格运动的有效性 .此外 ,用成分数目 K*、拟合误差 DK*n和主成分系数 p*k 描述金融资产收益的性质 ,对外汇银行同业拆借市场和中国股票市场实证分析 相似文献