全文获取类型
收费全文 | 581篇 |
免费 | 24篇 |
国内免费 | 14篇 |
专业分类
化学 | 310篇 |
晶体学 | 7篇 |
力学 | 14篇 |
数学 | 187篇 |
物理学 | 101篇 |
出版年
2023年 | 7篇 |
2022年 | 15篇 |
2021年 | 15篇 |
2020年 | 23篇 |
2019年 | 27篇 |
2018年 | 31篇 |
2017年 | 24篇 |
2016年 | 31篇 |
2015年 | 14篇 |
2014年 | 19篇 |
2013年 | 36篇 |
2012年 | 35篇 |
2011年 | 37篇 |
2010年 | 28篇 |
2009年 | 19篇 |
2008年 | 43篇 |
2007年 | 29篇 |
2006年 | 28篇 |
2005年 | 16篇 |
2004年 | 21篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 12篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 7篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有619条查询结果,搜索用时 15 毫秒
51.
We derive the leading-order equations that govern the dynamics of the flow in a falling, free-standing soap film. Starting with the incompressible Navier?CStokes equations, we carry out an asymptotic analysis using parameters that correspond to a common experimental setup. We account for the effects of inertia, surface elasticity, pressure, viscous stresses, gravity, and air drag. We find that the dynamics of the flow is dominated by the effects of inertia, surface elasticity, gravity, and air drag. We solve the leading-order equations to compute the steady-state profiles of velocity, thickness, and pressure in an experiment in which the film is in the Marangoni elasticity regime. The computational results, which include a Marangoni shock, are in good accord with the experimental measurements. 相似文献
52.
Hoang Luc Nguyen Huy Tuan Nguyen Yong Zhou 《Mathematical Methods in the Applied Sciences》2019,42(10):3481-3495
In this paper, we deal with the backward problem of determining initial condition for Rayleigh‐Stokes where the data are given at a fixed time. The problem has many applications in some non‐Newtonian fluids. We give some regularity properties of the solution to backward problem. 相似文献
53.
Nguyen Du Vi Nhan Dinh Thanh Duc Vu Kim Tuan Tran Dinh Phung 《Journal of Mathematical Analysis and Applications》2019,469(1):342-357
We prove some Picone-type identities and inequalities for a class of first-order nonlinear dynamic systems and derive various weighted inequalities of Wirtinger type and Hardy type on time scales. As applications we study oscillatory and related properties of these systems including Reid's roundabout theorem on disconjugacy, Sturm's separation and comparison theorems, as well as a variational method in the oscillation theory. 相似文献
54.
Positivity - The main goal of this note is to formulate sequence-based necessary second-order optimality conditions for a semilinear elliptic optimal control problem, with a pointwise pure state... 相似文献
55.
Tetraarylthiophenes were prepared by regioselective Suzuki cross-coupling reactions of tetrabromothiophene. 相似文献
56.
57.
Sufficient conditions are given for linear processes and ARMA processes to have the Gaswirth and Rubin mixing condition. The mixing rates are also determined. 相似文献
58.
59.
60.
This paper concerns the asymptotic validity of the bootstrap method in a non-regular model. Specifically, it is shown that the parametric bootstrap of the change-point parameter in the change-point hazard rate model works. 相似文献