全文获取类型
收费全文 | 9575篇 |
免费 | 715篇 |
国内免费 | 769篇 |
专业分类
化学 | 148篇 |
力学 | 651篇 |
综合类 | 211篇 |
数学 | 9549篇 |
物理学 | 500篇 |
出版年
2024年 | 10篇 |
2023年 | 85篇 |
2022年 | 76篇 |
2021年 | 134篇 |
2020年 | 220篇 |
2019年 | 230篇 |
2018年 | 231篇 |
2017年 | 252篇 |
2016年 | 259篇 |
2015年 | 142篇 |
2014年 | 350篇 |
2013年 | 750篇 |
2012年 | 374篇 |
2011年 | 446篇 |
2010年 | 380篇 |
2009年 | 567篇 |
2008年 | 565篇 |
2007年 | 590篇 |
2006年 | 534篇 |
2005年 | 469篇 |
2004年 | 411篇 |
2003年 | 395篇 |
2002年 | 444篇 |
2001年 | 401篇 |
2000年 | 371篇 |
1999年 | 349篇 |
1998年 | 298篇 |
1997年 | 290篇 |
1996年 | 211篇 |
1995年 | 159篇 |
1994年 | 148篇 |
1993年 | 95篇 |
1992年 | 86篇 |
1991年 | 99篇 |
1990年 | 80篇 |
1989年 | 44篇 |
1988年 | 40篇 |
1987年 | 50篇 |
1986年 | 41篇 |
1985年 | 56篇 |
1984年 | 47篇 |
1983年 | 29篇 |
1982年 | 42篇 |
1981年 | 37篇 |
1980年 | 31篇 |
1979年 | 32篇 |
1978年 | 33篇 |
1977年 | 26篇 |
1976年 | 15篇 |
1973年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
We consider the problem of minimizing an SC1 function subject to inequality constraints. We propose a local algorithm whose distinguishing features are that: (a) a fast convergence rate is achieved under reasonable assumptions that do not include strict complementarity at the solution; (b) the solution of only linear systems is required at each iteration; (c) all the points generated are feasible. After analyzing a basic Newton algorithm, we propose some variants aimed at reducing the computational costs and, in particular, we consider a quasi-Newton version of the algorithm. 相似文献
32.
Lihong Wang 《Annals of the Institute of Statistical Mathematics》2004,56(2):251-264
The purpose of this paper is to investigate the asymptotic properties of the least squares estimates (L
2-estimates) and the least absolute deviation estimates (L
1-estimates) of the parameters of a nonlinear regression model subject to a set of equality and inequality restrictions, which
has a long-range dependent stationary process as its stochastic errors. Then we will compare the asymptotic relative efficiencies
of the above estimators. 相似文献
33.
Sh. M. Aitaliev 《International Applied Mechanics》2004,40(10):1065-1091
Some results on underground structures obtained by Kazakh mechanicians are reviewed. The review covers a period of the last forty years. Also results on the mechanics of special objects are discussed.Translated from Prikladnaya Mekhanika, Vol. 40, No. 10, pp. 3–36, October 2004. 相似文献
34.
35.
给出引理解决了方程非振动解与其各阶导数的符号关系,并由此得到了若干判别准则,用于判别三阶线性脉冲微分方程解的振动性与渐近性,举例说明了准则的有效性。本文推广了相关文献的结果。 相似文献
36.
Oracle inequality is a relatively new statistical tool for the analysis of nonparametric adaptive estimates. Oracle is a good pseudo-estimate that is based on both data and an underlying estimated curve. An oracle inequality shows how well an adaptive estimator mimics the oracle for a particular underlying curve. The most advanced oracle inequalities have been recently obtained by Cavalier and Tsybakov (2001) for Stein type blockwise estimates used in filtering a signal from a stationary white Gaussian process. The authors also conjecture that a similar result can be obtained for Efromovich–Pinsker (EP) type blockwise estimators where their approach, based on Stein's formula for risk calculation, does not work. This article proves the conjecture and extends it upon more general models which include not stationary and dependent processes. Other possible extensions, a discussion of practical implications and a numerical study are also presented. 相似文献
37.
YaoKui ChenZhixiang 《分析论及其应用》2003,19(2):115-120
This paper gives the weighted Lp convergence rate estimations of the Gruenwald interpolatory polynomials based on the zeros of Chebyshev polymomials of the first kind,and proves that the order of the estimations is optimal for p≥1. 相似文献
38.
We obtain exponential upper bounds for tails of distributions of generalized L-statistics based on a sample from an exponential distribution. We prove the asymptotic normality of generalized L-statistics based on a sample from the uniform distribution on [0,1] and of L-statistics with decomposed kernels (without any restrictions on the sample distribution type). 相似文献
39.
Kurt Majewski 《Queueing Systems》2005,50(2-3):199-230
We consider multiclass feedforward queueing networks under first in first out and priority service disciplines driven by long-range dependent arrival and service time processes. We show that in critical loading the normalized workload, queue length and sojourn time processes can converge to a multi-dimensional reflected fractional Brownian motion. This weak heavy traffic approximation is deduced from a deterministic pathwise approximation of the network behavior close to constant critical load in terms of the solution of a Skorokhod problem. Since we model the doubly infinite time interval, our results directly cover the stationary case.AMS subject classification: primary 90B15, secondary 60K25, 68M20 相似文献
40.