全文获取类型
收费全文 | 865篇 |
免费 | 58篇 |
国内免费 | 17篇 |
专业分类
化学 | 70篇 |
力学 | 506篇 |
综合类 | 3篇 |
数学 | 198篇 |
物理学 | 163篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 11篇 |
2020年 | 26篇 |
2019年 | 22篇 |
2018年 | 27篇 |
2017年 | 15篇 |
2016年 | 25篇 |
2015年 | 19篇 |
2014年 | 23篇 |
2013年 | 54篇 |
2012年 | 51篇 |
2011年 | 35篇 |
2010年 | 23篇 |
2009年 | 43篇 |
2008年 | 49篇 |
2007年 | 50篇 |
2006年 | 44篇 |
2005年 | 52篇 |
2004年 | 48篇 |
2003年 | 32篇 |
2002年 | 39篇 |
2001年 | 21篇 |
2000年 | 24篇 |
1999年 | 22篇 |
1998年 | 25篇 |
1997年 | 24篇 |
1996年 | 22篇 |
1995年 | 14篇 |
1994年 | 16篇 |
1993年 | 13篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 11篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1982年 | 1篇 |
1978年 | 2篇 |
排序方式: 共有940条查询结果,搜索用时 22 毫秒
101.
本文考虑出现在人口动力学及稳定分层粘性湍动慢剪切流的热与质量传输理论中一类拟抛物粘性扩散方程解的渐近性态.证明了有限维整体吸引子的存在性. 相似文献
102.
Interaction between two spheres with an interstitial fluid is essential in Discrete Element modeling for simulating the behaviors of ‘wet‘ particulate materials. In this paper the interaction between two spheres with an interstitial Power-law fluid was approximately resolved as normal and tangential interactive models respectively, for which the governing equations were simplified on the basis of Reynolds approximation. These equations were then solved analytically together with the boundary conditions to obtain the pressure distributions for each individual model, and event ually solutions of the viscous squeeze force and the tangential viscous resistance were obtained, which provide a set of solutions for implementing into DEM code or other purposes. 相似文献
103.
Madjid Birouk BarryJ. Azzopardi Thomas Stbler 《Particle & Particle Systems Characterization》2003,20(4):283-289
This article presents an experimental study of the primary break‐up of a viscous liquid jet interacting with a cross airflow. This experiment was carried out in an open circuit wind tunnel. The measurement test section was made of clear acrylic resin to allow optical access for visualizing and imaging the jet break‐up in the cross airflow. The working liquid used in the present experiment was the aero‐engine lubrication oil, which was injected at 90° into the airflow, via a nozzle from the top wall of the test‐section. The effects of liquid viscosity, and the jet and cross airflow velocities on the primary break‐up mechanisms of the jet were studied. The main results showed that different break‐up regimes were identified; column break‐up and bag break‐up separated by a transition zone, and new correlations have been proposed for predicting the jet transverse and streamwise penetrations before break‐up. 相似文献
104.
105.
气轨上简谐振子运动规律的探讨 总被引:1,自引:0,他引:1
本文探讨了空气粘滞阻力诸因素对气轨上简谐振子运动规律的影响,澄清了一些模糊认识,提出了减小影响的最直接有效的方法。 相似文献
106.
107.
本文讨论了三维粘流一无粘干扰流动方程组部分正则性问题,引入了新的三维粘流-无粘干扰流动假设,并得到了相应的结论。 相似文献
108.
A new analytic technique is applied to solve the unsteady viscous flow due to an infinite rotating disk, governed by a set
of two fully coupled nonlinear partial differential equations deduced directly from the exact Navier-Stokes equations. The
system of coupled nonlinear partial differential equations is replaced by a sequence of uncoupled systems of linear ordinary
differential equations. Different from all other previous analytic results, our series solution is accurate and valid for
all time in the whole spatial region. Accurate expressions for skin friction coefficients are given, which are valid for all
time. Such kind of series solutions have not been reported, to the best of our knowledge.
相似文献
109.
Rajiv R. Thareja James R. Stewart Obey Hassan Ken Morgan Jaime Peraire 《国际流体数值方法杂志》1989,9(4):405-425
An upwind finite element technique that uses cell-centred quantities and implicit and/or explicit time marching has been developed for computing hypersonic laminar viscous flows using adaptive triangular grids. The approach is an extension to unstructured grids of the LAURA algorithm due to Gnoffo. A structured grid of quadrilaterals is laid out near a solid surface. For inviscid flows the method is stable at Courant numbers of over 100000. A first-order basic scheme and a higher-order flux-corrected transport (FCT) scheme have been implemented. This technique has been applied to the problem of predicting type III and IV shock wave interactions on a cylinder, with a view to simulating the pressure and heating rate augmentation caused by an impinging shock on the leading edge of a cowl lip of an engine inlet. The predictions of wall pressure and heating rates compare very well with experimental data. The flow features are distinctly captured with a sequence of adaptively generated grids. 相似文献
110.
The flow of steady incompressible viscous fluid rotating about the z-axis with angular velocity ω and moving with velocity u past a sphere of radius a which is kept fixed at the origin is investigated by means of a numerical method for small values of the Reynolds number Reω. The Navier–Stokes equations governing the axisymmetric flow can be written as three coupled non-linear partial differential equations for the streamfunction, vorticity and rotational velocity component. Central differences are applied to the partial differential equations for solution by the Peaceman–Rachford ADI method, and the resulting algebraic equations are solved by the ‘method of sweeps’. The results obtained by solving the non-linear partial differential equations are compared with the results obtained by linearizing the equations for very small values of Reω. Streamlines are plotted for Ψ = 0·05, 0·2, 0·5 for both linear and non-linear cases. The magnitude of the vorticity vector near the body, i.e. at z = 0·2, is plotted for Reω = 0·05, 0·24, 0·5. The correction to the Stokes drag as a result of rotation of the fluid is calculated. 相似文献