全文获取类型
收费全文 | 3174篇 |
免费 | 173篇 |
国内免费 | 199篇 |
专业分类
化学 | 194篇 |
晶体学 | 1篇 |
力学 | 89篇 |
综合类 | 47篇 |
数学 | 2721篇 |
物理学 | 494篇 |
出版年
2024年 | 3篇 |
2023年 | 35篇 |
2022年 | 29篇 |
2021年 | 57篇 |
2020年 | 40篇 |
2019年 | 62篇 |
2018年 | 64篇 |
2017年 | 82篇 |
2016年 | 68篇 |
2015年 | 71篇 |
2014年 | 134篇 |
2013年 | 253篇 |
2012年 | 124篇 |
2011年 | 136篇 |
2010年 | 132篇 |
2009年 | 177篇 |
2008年 | 236篇 |
2007年 | 231篇 |
2006年 | 179篇 |
2005年 | 151篇 |
2004年 | 135篇 |
2003年 | 138篇 |
2002年 | 144篇 |
2001年 | 93篇 |
2000年 | 107篇 |
1999年 | 81篇 |
1998年 | 78篇 |
1997年 | 85篇 |
1996年 | 57篇 |
1995年 | 52篇 |
1994年 | 42篇 |
1993年 | 24篇 |
1992年 | 26篇 |
1991年 | 15篇 |
1990年 | 29篇 |
1989年 | 14篇 |
1988年 | 14篇 |
1987年 | 20篇 |
1986年 | 8篇 |
1985年 | 16篇 |
1984年 | 14篇 |
1983年 | 7篇 |
1982年 | 15篇 |
1981年 | 19篇 |
1980年 | 8篇 |
1979年 | 16篇 |
1978年 | 7篇 |
1977年 | 11篇 |
1976年 | 2篇 |
1975年 | 2篇 |
排序方式: 共有3546条查询结果,搜索用时 31 毫秒
11.
S. Mancini D. Vitali V. Giovannetti P. Tombesi 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,22(3):417-422
We show that the optomechanical coupling between an optical cavity mode and two movable cavity mirrors is able to entangle
two different macroscopic oscillation modes of the mirrors. This continuous variable entanglement is maintained by the light
bouncing between the mirrors and is robust against thermal noise. In fact, it could be experimentally demonstrated using present
technology.
Received 2 September 2002 / Received in final form 10 October 2002 Published online 7 January 2003 相似文献
12.
M. A. Bertolim M. P. Mello K. A. de Rezende 《Transactions of the American Mathematical Society》2005,357(10):4091-4129
In this article the main theorem establishes the necessity and sufficiency of the Poincaré-Hopf inequalities in order for the Morse inequalities to hold. The convex hull of the collection of all Betti number vectors which satisfy the Morse inequalities for a pre-assigned index data determines a Morse polytope defined on the nonnegative orthant. Using results from network flow theory, a scheme is provided for constructing all possible Betti number vectors which satisfy the Morse inequalities for a pre-assigned index data. Geometrical properties of this polytope are described.
13.
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
14.
For vector quasivariational inequalities involving multifunctions in topological vector spaces, an existence result is obtained without a monotonicity assumption and with a convergence assumption weaker than semicontinuity. A new type of quasivariational inequality is proposed. Applications to quasicomplementarity problems and traffic network equilibria are considered. In particular, definitions of weak and strong Wardrop equilibria are introduced for the case of multivalued cost functions. 相似文献
15.
Li-ming Wu~ Zheng-liang Zhang~ Laboratoire de Mathématiques Appliquées.CNRS-UMR Université Blaise Pascal Aubière France 《应用数学学报(英文版)》2004,(3)
Using the method of Girsanov transformation,we establish the Talagrand's T_2-inequality for dif-fusion on the path space C([0,N],R~d) with respect to a uniform metric,with the constant independent of N.This improves the known results for the L~2-metric. 相似文献
16.
美式期权定价中非局部问题的有限元方法 总被引:2,自引:1,他引:1
在本文中 ,我们关心的是美式期权的有限元方法 .首先 ,根据 [4 ]我们对所讨论的问题引进一个新奇的实用的方法 ,它涉及到对原问题重新形成准确的数学公式 ,使得数值解的计算可以在非常小的区域上进行 ,从而该算法计算速度快精度高 .进而 ,我们利用超逼近分析技术得到了有限元解关于 L2 -模的最优估计 . 相似文献
17.
The projective method for solving linear matrix inequalities 总被引:2,自引:0,他引:2
Numerous problems in control and systems theory can be formulated in terms of linear matrix inequalities (LMI). Since solving
an LMI amounts to a convex optimization problem, such formulations are known to be numerically tractable. However, the interest
in LMI-based design techniques has really surged with the introduction of efficient interior-point methods for solving LMIs
with a polynomial-time complexity. This paper describes one particular method called the Projective Method. Simple geometrical
arguments are used to clarify the strategy and convergence mechanism of the Projective algorithm. A complexity analysis is
provided, and applications to two generic LMI problems (feasibility and linear objective minimization) are discussed. 相似文献
18.
We establish the optimal asymptotic decay rate of per-session queue length tail distributions for a two-queue system where
a single constant rate server serves the two queues using the Generalized Processor Sharing (GPS) scheduling discipline. The
result is obtained using the sample-path large deviation principle and has implications in call admission control for high-speed
communication networks.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
19.
In this paper, we present a unified treatment and analysis of a dynamic traffic network model with elastic demands formulated and studied as a projected dynamical system. We propose a travel route choice adjustment process that satisfies the projected dynamical system. Under certain conditions, stability and asymptotical stability of the equilibrium patterns are then derived. Finally, two discrete-time algorithms, the Euler method and the Heun method, are proposed for the computation of the solutions, and convergence results established. The convergence results depend crucially on stability analysis. The performance of the algorithms is then illustrated on several transportation networks. 相似文献
20.
对一类变形的变分不等式:求,使得提出了一类投影收缩算法,并得到了该算法的收敛性及相关性质. 相似文献