全文获取类型
收费全文 | 3563篇 |
免费 | 280篇 |
国内免费 | 12篇 |
专业分类
化学 | 1969篇 |
晶体学 | 18篇 |
力学 | 79篇 |
数学 | 173篇 |
物理学 | 619篇 |
无线电 | 997篇 |
出版年
2024年 | 5篇 |
2023年 | 43篇 |
2022年 | 66篇 |
2021年 | 84篇 |
2020年 | 79篇 |
2019年 | 100篇 |
2018年 | 66篇 |
2017年 | 70篇 |
2016年 | 150篇 |
2015年 | 116篇 |
2014年 | 143篇 |
2013年 | 258篇 |
2012年 | 271篇 |
2011年 | 272篇 |
2010年 | 188篇 |
2009年 | 173篇 |
2008年 | 248篇 |
2007年 | 227篇 |
2006年 | 218篇 |
2005年 | 178篇 |
2004年 | 143篇 |
2003年 | 136篇 |
2002年 | 140篇 |
2001年 | 75篇 |
2000年 | 75篇 |
1999年 | 39篇 |
1998年 | 43篇 |
1997年 | 35篇 |
1996年 | 44篇 |
1995年 | 35篇 |
1994年 | 19篇 |
1993年 | 21篇 |
1992年 | 17篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 6篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1976年 | 5篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1963年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有3855条查询结果,搜索用时 15 毫秒
111.
112.
113.
114.
An integrated finite element method (FEM) is proposed to simulate incompressible two‐phase flows with surface tension effects, and three different surface tension models are applied to the FEM to investigate spurious currents and temporal stability. A Q2Q1 element is adopted to solve the continuity and Navier–Stokes equations and a Q2‐iso‐Q1 to solve the level set equation. The integrated FEM solves pressure and velocity simultaneously in a strongly coupled manner; the level set function is reinitialized by adopting a direct approach using interfacial geometry information instead of solving a conventional hyperbolic‐type equation. In addition, a consistent continuum surface force (consistent CSF) model is utilized by employing the same basis function for both surface tension and pressure variables to damp out spurious currents and to estimate the accurate pressure distribution. The model is further represented as a semi‐implicit manner to improve temporal stability with an increased time step. In order to verify the accuracy and robustness of the code, the present method is applied to a few benchmark problems of the static bubble and rising bubble with large density and viscosity ratios. The Q2Q1‐integrated FEM coupled with the semi‐implicit consistent CSF demonstrates the significantly reduced spurious currents and improved temporal stability. The numerical results are in good qualitative and quantitative agreements with those of the existing studies. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
115.
116.
117.
118.
Junwye Lee Jonghyun Koo Si Un Hwang Sunmin Min Sang Jung Ahn Yonghan Roh Sung Ha Park 《Current Applied Physics》2012,12(4):1207-1211
We report the structural and functional stabilities of artificially synthesized DNA ultra-thin films. Fully covered DNA ultra-thin films on a silica substrate were fabricated by the silica-assisted growth method and those samples were then incubated in various chemicals and physical conditions. The DNA ultra-thin films showed high maintainability under those harsh conditions and these results would aid to facilitate the use of artificial DNA ultra-thin films in advanced research areas such as biophotonics and bioelectronics. 相似文献
119.
120.