全文获取类型
收费全文 | 37篇 |
免费 | 12篇 |
国内免费 | 8篇 |
专业分类
化学 | 6篇 |
力学 | 23篇 |
数学 | 4篇 |
物理学 | 24篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 1篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 7篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1995年 | 2篇 |
1993年 | 1篇 |
排序方式: 共有57条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
对于较厚复合材料弯曲问题,已有锯齿型厚板理论最大误差超过35%。为了合理地分析较厚复合材料弯曲问题,发展了准确高效的锯齿型厚板理论。此理论位移变量个数独立于层合板层数,其面内位移不含有横向位移一阶导数,构造有限元时仅需C0插值函数,故称此理论为C0型锯齿厚板理论。基于发展的锯齿理论,构造了六节点三角形单元并推导了复合材料层合/夹层板弯曲问题有限元列式。为验证C0型锯齿厚板理论性能,分析了复合材料层合/夹层厚板弯曲问题,并与已有C1型锯齿理论对比。结果表明,本文的C0型锯齿厚板理论最大误差15%,比已有锯齿型厚板理论准确高效。 相似文献
35.
The present paper reports the first investigation on a turbulent jet issuing from a diamond orifice(hereafter termed a "diamond jet") with an aspect ratio of 1.7.Velocity measurements were conducted in the transitional region,and the exit Reynolds number of the jet was 50000.For comparison,a round jet with identical normalized boundary conditions was also measured.It is shown that the diamond jet decays and spreads faster than the round jet does over the measured flow region.The axis-switching phenomenon is observed in the diamond jet.Although both jets display primary coherent structures in the near field,these structures are found to break down more rapidly in the diamond jet,due to the higher three-dimensionality of the flow.Moreover,the streamwise components of the Reynolds normal stress and all the shear stresses reach their maxima around the location of the maximal mean shear while the maxima of the lateral components of the Reynolds normal stresses occur around the centreline of the jet. 相似文献
36.
D. TRIPATHI N.ALI T. HAYAT M. K. CHAUBE A. A. HENDI 《应用数学和力学(英文版)》2011,32(10):1231-1244
The present investigation studies the peristaltic flow of the Jeffrey fluid through a tube of finite length. The fluid is
electrically conducting in the presence of an applied magnetic field. Analysis is carried out under the assumption of long
wavelength and low Reynolds number approximations. Expressions of the pressure gradient, volume flow rate, average volume
flow rate, and local wall shear stress are obtained. The effects of relaxation time, retardation time, Hartman number on pressure,
local wall shear stress, and mechanical efficiency of peristaltic pump are studied. The reflux phenomenon is also investigated.
The case of propagation of a non-integral number of waves along the tube walls, which are inherent characteristics of finite
length vessels, is also examined. 相似文献
37.
38.
利用分子动力学方法研究了金属钨中螺位错在剪切力作用下的运动特性.根据弹性理论在BCC晶体中形成位错线沿<111>的螺位错,在合适的边界条件下获得平衡态的位错结构.发现位错由{110}平面沿<112>方向三个呈对称的皱褶组成.对平衡态结构施加剪切力,发现剪力很小时,位错核心不动,核心形状有畸变;当剪力增大到一定程度时位错开始运动.位错运动后,剪切力较小时,核心呈“之”字形运动;在较大剪力下,位错开始阶段呈“之”字形运动,一段距离后主要沿[211]方向作直线运动.位错运动的速度随着剪切力的增加而增大. 相似文献
39.
A multiscale model for analyzing the synergy of CS and WSS on the endothelium in straight arteries 总被引:3,自引:0,他引:3
A multiscale model was proposed to calculate the circumferential stress (CS) and wall shear stress (WSS) and analyze the effects
of global and local factors on the CS, WSS and their synergy on the arterial endothelium in large straight arteries. A parameter
pair [Zs,SPA] (defined as the ratio of CS amplitude to WSS amplitude and the phase angle between CS and WSS for different harmonic components,
respectively) was proposed to characterize the synergy of CS and WSS. The results demonstrated that the CS or WSS in the large
straight arteries is determined by the global factors, i.e. the preloads and the afterloads, and the local factors, i.e. the
local mechanical properties and the zero-stress states of arterial walls, whereas the Zs and SPA are primarily determined by the local factors and the afterloads. Because the arterial input impedance has been shown to
reflect the physiological and pathological states of whole downstream arterial beds, the stress amplitude ratio Zs and the stress phase difference SPA might be appropriate indices to reflect the influences of the states of whole downstream arterial beds on the local blood
flow-dependent phenomena such as angiogenesis, vascular remodeling and atherosgenesis.
The project supported by the National Natural Science Foundation of China (10132020 and 10472027). The English text was polished
by Yunming Chen. 相似文献
40.
研究的目的是确立用单一倾斜热线探头进行三维湍流测试的基础技术.在阐明基本原理,基础方程式的基础上,对比实验结果,证明应用所阐明的方法、用单一倾斜热线探头进行三维湍流测试是切实可行的.对边界层壁面附近的测试结果表明考虑平均速度和变动速度的高次相关项后可以得到更加精确的实验结果. 相似文献