全文获取类型
收费全文 | 9088篇 |
免费 | 733篇 |
国内免费 | 488篇 |
专业分类
化学 | 1254篇 |
晶体学 | 145篇 |
力学 | 708篇 |
综合类 | 72篇 |
数学 | 6573篇 |
物理学 | 1557篇 |
出版年
2024年 | 20篇 |
2023年 | 76篇 |
2022年 | 110篇 |
2021年 | 117篇 |
2020年 | 238篇 |
2019年 | 237篇 |
2018年 | 241篇 |
2017年 | 253篇 |
2016年 | 262篇 |
2015年 | 215篇 |
2014年 | 386篇 |
2013年 | 856篇 |
2012年 | 329篇 |
2011年 | 503篇 |
2010年 | 504篇 |
2009年 | 571篇 |
2008年 | 634篇 |
2007年 | 575篇 |
2006年 | 498篇 |
2005年 | 454篇 |
2004年 | 394篇 |
2003年 | 355篇 |
2002年 | 322篇 |
2001年 | 253篇 |
2000年 | 210篇 |
1999年 | 211篇 |
1998年 | 165篇 |
1997年 | 162篇 |
1996年 | 143篇 |
1995年 | 109篇 |
1994年 | 99篇 |
1993年 | 78篇 |
1992年 | 66篇 |
1991年 | 53篇 |
1990年 | 48篇 |
1989年 | 33篇 |
1988年 | 41篇 |
1987年 | 24篇 |
1986年 | 43篇 |
1985年 | 46篇 |
1984年 | 55篇 |
1983年 | 40篇 |
1982年 | 50篇 |
1981年 | 42篇 |
1980年 | 38篇 |
1979年 | 45篇 |
1978年 | 30篇 |
1977年 | 17篇 |
1976年 | 20篇 |
1973年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
一类泛函微分方程周期解的存在性与应用 总被引:6,自引:1,他引:5
本文给出了一类滞后型泛函微分方程有一个周期解的四个充分性定理,其结果明显地优于著名的Yoshizawa周期解定理,最后给出了应用实例。 相似文献
72.
Jean-Franç ois Coulombel 《Proceedings of the American Mathematical Society》2006,134(3):683-688
This paper is devoted to the convergence of solutions of the compressible Euler equations towards solutions of the pressureless gas dynamics system, when the pressure tends to 0. The goal is to prove accurate uniform bounds for particular solutions of the Euler equations.
73.
关于一类空间齐次推广的耗散碰撞Boltzmann方程Cauchy问题 ,对于一般的初始条件得到了正古典解的存在唯一性 . 相似文献
74.
Peter A. Markowich Gerhard Rein Gershon Wolansky 《Journal of statistical physics》2002,106(5-6):1221-1239
We consider the Schrödinger–Poisson system in the repulsive (plasma physics) Coulomb case. Given a stationary state from a certain class we prove its nonlinear stability, using an appropriately defined energy-Casimir functional as Lyapunov function. To obtain such states we start with a given Casimir functional and construct a new functional which is in some sense dual to the corresponding energy-Casimir functional. This dual functional has a unique maximizer which is a stationary state of the Schrödinger–Poisson system and lies in the stability class. The stationary states are parameterized by the equation of state, giving the occupation probabilities of the quantum states as a strictly decreasing function of their energy levels. 相似文献
75.
P. Kh. Atanasova T. L. Bojadjiev S. N. Dimova 《Computational Mathematics and Mathematical Physics》2006,46(4):666-679
Partial critical dependences of the form current-magnetic field in a two-layered symmetric Josephson junction are modeled. A numerical experiment shows that, for the zero interaction coefficient between the layers of the junction, jumps of the critical currents corresponding to different distributions of the magnetic fluxes in the layers may appear on the critical curves. This fact allows a mathematical interpretation of the results of some recent experimental results for two-layered junctions as a consequence of discontinuities of partial critical curves. 相似文献
76.
This paper is concerned with the existence of positive solutions of two-point Dirichlet singular and nonsingular boundary problems for second-order quasi-linear differential equations with changing sign nonlinearities. 相似文献
77.
This article will combine the finite element method, the interpolated coefftcient finite element method, the eigenfunction expansion method, and the search-extension method to obtain the multiple solutions for semilinear elliptic equations. This strategy not only grently reduces the expensive computation, but also is successfully implemented to obtain multiple solutions for a class of semilinear elliptic boundary value problems with non-odd nonlinearity on some convex or nonconvex domains. Numerical solutions illustrated by their graphics for visualization will show the efficiency of the approach. 相似文献
78.
关于非线性Schrodinger方程混合问题解的破裂和质量集中 总被引:1,自引:0,他引:1
本文讨论了一类非线性Schrodinger方程混合问题解的破裂现象,blow-up时刻的估计和质量集中定理,并推广和改进了[l~3]中的结果. 相似文献
79.
This paper describes a numerical realization of an extended continuous Newton method defined by Diener. It traces a connected set of locally one-dimensional trajectories which contains all critical points of a smooth functionf:
n
. The results show that the method is effectively applicable.The authors would like to thank L. C. W. Dixon for pointing out some errors in the original version of this paper and for several suggestions of improvements. 相似文献
80.
We consider the Stackelberg problem corresponding to a two-player game in which one of the two players has the leadership in playing the game. We present a general approach for approximating the considered hierarchical programming problem by a sequence of two-level optimization problems. From a practical point of view, we also give some results for asymptotically Stackelberg approximating sequences and for problems with perturbed constraints.This paper is based upon results first presented at Journées Fermat: Mathematics for Optimization, Toulouse, France, May 1985. 相似文献