全文获取类型
收费全文 | 10680篇 |
免费 | 2543篇 |
国内免费 | 793篇 |
专业分类
化学 | 2069篇 |
晶体学 | 76篇 |
力学 | 2546篇 |
综合类 | 137篇 |
数学 | 2348篇 |
物理学 | 6840篇 |
出版年
2024年 | 28篇 |
2023年 | 115篇 |
2022年 | 200篇 |
2021年 | 241篇 |
2020年 | 336篇 |
2019年 | 259篇 |
2018年 | 293篇 |
2017年 | 363篇 |
2016年 | 374篇 |
2015年 | 333篇 |
2014年 | 608篇 |
2013年 | 693篇 |
2012年 | 650篇 |
2011年 | 785篇 |
2010年 | 635篇 |
2009年 | 651篇 |
2008年 | 733篇 |
2007年 | 732篇 |
2006年 | 688篇 |
2005年 | 655篇 |
2004年 | 622篇 |
2003年 | 576篇 |
2002年 | 446篇 |
2001年 | 433篇 |
2000年 | 363篇 |
1999年 | 285篇 |
1998年 | 276篇 |
1997年 | 236篇 |
1996年 | 190篇 |
1995年 | 190篇 |
1994年 | 138篇 |
1993年 | 152篇 |
1992年 | 127篇 |
1991年 | 121篇 |
1990年 | 86篇 |
1989年 | 82篇 |
1988年 | 67篇 |
1987年 | 53篇 |
1986年 | 32篇 |
1985年 | 28篇 |
1984年 | 27篇 |
1983年 | 17篇 |
1982年 | 28篇 |
1981年 | 17篇 |
1980年 | 12篇 |
1979年 | 15篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1973年 | 6篇 |
1971年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
1.
2.
Sha Xia Dan Wang Nian-Ke Chen Dong Han Xian-Bin Li Hong-Bo Sun 《Annalen der Physik》2020,532(3):1900318
Defects play a central role in controlling the electronic properties of two-dimensional (2D) materials and realizing the industrialization of 2D electronics. However, the evaluation of charged defects in 2D materials within first-principles calculation is very challenging and has triggered a recent development of the WLZ (Wang, Li, Zhang) extrapolation method. This method lays the foundation of the theoretical evaluation of energies of charged defects in 2D materials within the first-principles framework. Herein, the vital role of defects for advancing 2D electronics is discussed, followed by an introduction of the fundamentals of the WLZ extrapolation method. The ionization energies (IEs) obtained by this method for defects in various 2D semiconductors are then reviewed and summarized. Finally, the unique defect physics in 2D dimensions including the dielectric environment effects, defect ionization process, and carrier transport mechanism captured with the WLZ extrapolation method are presented. As an efficient and reasonable evaluation of charged defects in 2D materials for nanoelectronics and other emerging applications, this work can be of benefit to the community. 相似文献
3.
Tsuguo SUNAMURA 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2015,91(9):481-500
Substantial progress in research on the recession of coastal cliffs composed of soft materials has been made in recent years and data with higher accuracy have been accumulated. This paper provides the state of the art review in the recession studies and highlights two new findings obtained from the reanalysis of existing data. The review topics are: episodic and localized nature of cliff recession; the development of cliffline; the relationship between cliff height and recession rate; mechanisms of cliff toe erosion by waves; a fundamental equation for wave-induced toe erosion; factors controlling toe erosion; and slope instabilities and mass movements. The findings are presented on (1) the temporal change in cliffline recession mode and (2) the effect of beach sediment at the cliff base on the cliff erosion. 相似文献
4.
5.
Bobby Wilson 《偏微分方程通讯》2015,40(8):1521-1542
This article explores the questions of long time orbital stability in high order Sobolev norms of plane wave solutions to the NLSE in the defocusing case. 相似文献
6.
The zero dissipation limit of the one-dimensional non-isentropic micropolar equations is studied in this paper. If the given rarefaction wave which connects to vacuum at one side, a sequence of solution to the micropolar equations can be constructed which converge to the above rarefaction wave with vacuum as the viscosity and the heat conduction coefficient tend to zero. Moreover, the uniform convergence rate is obtained. The key point in our analysis is how to control the degeneracies in the vacuum region in the zero dissipation limit process. 相似文献
7.
《Annales de l'Institut Henri Poincaré (C) Analyse Non Linéaire》2020,37(2):417-456
We study the energy-critical nonlinear wave equation in the presence of an inverse-square potential in dimensions three and four. In the defocussing case, we prove that arbitrary initial data in the energy space lead to global solutions that scatter. In the focusing case, we prove scattering below the ground state threshold. 相似文献
8.
In this paper, we consider a viscoelastic wave equation of variable coefficients in the presence of past history with nonlinear damping and delay in the internal feedback and dynamic boundary conditions. Under suitable assumptions, we establish an explicit and general decay rate result without imposing restrictive assumption on the behavior of the relaxation function at infinity by Riemannian geometry method and Lyapunov functional method. 相似文献
9.
10.