全文获取类型
收费全文 | 6186篇 |
免费 | 433篇 |
国内免费 | 490篇 |
专业分类
化学 | 114篇 |
力学 | 269篇 |
综合类 | 155篇 |
数学 | 6368篇 |
物理学 | 203篇 |
出版年
2024年 | 5篇 |
2023年 | 56篇 |
2022年 | 59篇 |
2021年 | 94篇 |
2020年 | 137篇 |
2019年 | 154篇 |
2018年 | 149篇 |
2017年 | 172篇 |
2016年 | 176篇 |
2015年 | 112篇 |
2014年 | 245篇 |
2013年 | 481篇 |
2012年 | 281篇 |
2011年 | 320篇 |
2010年 | 265篇 |
2009年 | 382篇 |
2008年 | 346篇 |
2007年 | 386篇 |
2006年 | 328篇 |
2005年 | 290篇 |
2004年 | 248篇 |
2003年 | 234篇 |
2002年 | 258篇 |
2001年 | 252篇 |
2000年 | 245篇 |
1999年 | 207篇 |
1998年 | 191篇 |
1997年 | 182篇 |
1996年 | 135篇 |
1995年 | 107篇 |
1994年 | 88篇 |
1993年 | 69篇 |
1992年 | 49篇 |
1991年 | 48篇 |
1990年 | 51篇 |
1989年 | 26篇 |
1988年 | 20篇 |
1987年 | 24篇 |
1986年 | 23篇 |
1985年 | 29篇 |
1984年 | 27篇 |
1983年 | 15篇 |
1982年 | 30篇 |
1981年 | 20篇 |
1980年 | 16篇 |
1979年 | 18篇 |
1978年 | 20篇 |
1977年 | 14篇 |
1976年 | 11篇 |
1974年 | 3篇 |
排序方式: 共有7109条查询结果,搜索用时 15 毫秒
21.
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
22.
23.
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
24.
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
25.
26.
One of the most ignored, but urgent and vital challenges confronting society today is the vulnerability of urban areas to extreme events. Current organization of response systems, predominantly based on a command and control model, limits their effectiveness and efficiency. Particularly, in decision‐making processes where a large number of actors may be involved. In this article, a new distributed collaborative decision‐making model is proposed to overcome command and control limitations encountered in stressful, hostile, chaotic, and large‐scale settings. This model was derived by borrowing concepts from the collective decision making of honeybees foraging, a successful process in solving complex tasks within complex settings. The model introduced in this article was evaluated through differential equations, i.e., continuous analysis, and difference equations, i.e., discrete analysis. The most important result found is that the best available option in any large‐scale decision‐making problem can be configured as an attractor, in a distributed and timely manner. We suggest that the proposed model has the potential to facilitate decision‐making processes in large‐scale settings. © 2005 Wiley Periodicals, Inc. Complexity 11:28–38, 2005 相似文献
27.
On General Mixed Quasivariational Inequalities 总被引:5,自引:0,他引:5
In this paper, we suggest and analyze several iterative methods for solving general mixed quasivariational inequalities by using the technique of updating the solution and the auxiliary principle. It is shown that the convergence of these methods requires either the pseudomonotonicity or the partially relaxed strong monotonicity of the operator. Proofs of convergence is very simple. Our new methods differ from the existing methods for solving various classes of variational inequalities and related optimization problems. Various special cases are also discussed. 相似文献
28.
The aim of this article is to give some property of continued fraction with matrices arguments, about their convergence and
others applications. At the end of this work, we present a resolution of the Algebraic Riccati Equation by giving an explicit
continued fraction development of its solution.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
29.
In this paper, a unified approach for analysing finite dimensional approximations to a class of partial differential equations boundary value problems (second‐kind Fredholm differential equations) is introduced. The approach is shown to be general despite of its extremely simple form. In particular, it is expected to be useful in the convergence analysis of finite element methods for solving PDE problems. Three specific examples are presented to illustrate the broad applicability of the approach. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
30.
Typical behaviour of the solution of a linear system of equations obtained iteratively by Krylov methods can be characterized by three stages. Initially the residual diminishes steadily; this is followed by stagnation and finally rapid convergence near the algebraic grade. This study examines this behaviour in terms of the concepts of approximately invariant subspace and what we have called the analytic grade of a Krylov sequence. It is shown how the small Ritz values play a vital role in the convergence and how this knowledge helps in the construction of an effective preconditioner. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献