全文获取类型
收费全文 | 4766篇 |
免费 | 738篇 |
国内免费 | 264篇 |
专业分类
化学 | 299篇 |
晶体学 | 11篇 |
力学 | 498篇 |
综合类 | 42篇 |
数学 | 3351篇 |
物理学 | 1567篇 |
出版年
2024年 | 11篇 |
2023年 | 102篇 |
2022年 | 92篇 |
2021年 | 156篇 |
2020年 | 272篇 |
2019年 | 249篇 |
2018年 | 233篇 |
2017年 | 252篇 |
2016年 | 196篇 |
2015年 | 163篇 |
2014年 | 298篇 |
2013年 | 431篇 |
2012年 | 244篇 |
2011年 | 275篇 |
2010年 | 182篇 |
2009年 | 241篇 |
2008年 | 266篇 |
2007年 | 266篇 |
2006年 | 209篇 |
2005年 | 183篇 |
2004年 | 187篇 |
2003年 | 176篇 |
2002年 | 165篇 |
2001年 | 119篇 |
2000年 | 147篇 |
1999年 | 121篇 |
1998年 | 76篇 |
1997年 | 67篇 |
1996年 | 48篇 |
1995年 | 39篇 |
1994年 | 29篇 |
1993年 | 32篇 |
1992年 | 19篇 |
1991年 | 28篇 |
1990年 | 14篇 |
1989年 | 17篇 |
1988年 | 14篇 |
1987年 | 22篇 |
1986年 | 13篇 |
1985年 | 16篇 |
1984年 | 13篇 |
1983年 | 5篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1979年 | 10篇 |
1978年 | 4篇 |
1977年 | 8篇 |
1976年 | 5篇 |
1973年 | 11篇 |
1936年 | 4篇 |
排序方式: 共有5768条查询结果,搜索用时 31 毫秒
1.
2.
3.
This work is concerned with the extension of the Jacobi spectral Galerkin method to a class of nonlinear fractional pantograph differential equations. First, the fractional differential equation is converted to a nonlinear Volterra integral equation with weakly singular kernel. Second, we analyze the existence and uniqueness of solutions for the obtained integral equation. Then, the Galerkin method is used for solving the equivalent integral equation. The error estimates for the proposed method are also investigated. Finally, illustrative examples are presented to confirm our theoretical analysis. 相似文献
4.
Alessandro Morando Paola Trebeschi Tao Wang 《Journal of Differential Equations》2019,266(9):5397-5430
We show the short-time existence and nonlinear stability of vortex sheets for the nonisentropic compressible Euler equations in two spatial dimensions, based on the weakly linear stability result of Morando and Trebeschi (2008) [20]. The missing normal derivatives are compensated through the equations of the linearized vorticity and entropy when deriving higher-order energy estimates. The proof of the resolution for this nonlinear problem follows from certain a priori tame estimates on the effective linear problem in the usual Sobolev spaces and a suitable Nash–Moser iteration scheme. 相似文献
5.
6.
Mourad Kainane Mezadek Mohamed Kainane Mezadek Michael Reissig 《Mathematical Methods in the Applied Sciences》2020,43(6):3117-3147
In this paper, we study the global (in time) existence of small data solutions to the Cauchy problem for the semilinear wave equation with friction, viscoelastic damping, and a power nonlinearity. We are interested in the connection between regularity assumptions for the data and the admissible range of exponents p in the power nonlinearity. 相似文献
7.
8.
9.
S.-Y. Sheu D.-Y. Yang H.L. Selzle E.W. Schlag 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,20(3):557-563
Charge transport is one important example of signal transduction in a protein which is responsible for action at a distance,
and is a fundamental process in biochemical action. A model is presented in which electronic effects interact with motional
processes to combine into a bifunctional model. This model is investigated with new detailed molecular dynamics calculations
and successfully explains such action at a distance.
Received 1st February 2002 / Received in final form 26 May 2002 Published online 13 September 2002 相似文献
10.