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71.
Homotopy analysis solutions for the asymmetric laminar flow in a porous channel with expanding or contracting walls 总被引:6,自引:1,他引:5
Xin-Hui Si · Lian-Cun Zheng · Xin-Xin Zhang · Ying Chao Applied Science School University of Science Technology Beijing Beijing China Department of Mechanical Engineering China Research Institute of Chemical Defense of the P.L.A. Beijing China 《Acta Mechanica Sinica》2011,27(2):208-214
In this paper, the asymmetric laminar flow in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using suitable similar transformations. Homotopy analysis method (HAM) is employed to obtain the expres- sions for velocity fields. Graphs are sketched for values of parameters and associated dynamic characteristics, especially the expansion ratio, are analyzed in detail. 相似文献
72.
在超高真空系统中制备了C60的Yb填隙化合物薄膜.用x射线光电子能谱研究了Yb和C60结合过程中C 1s,Yb 4f和Yb 4d的变化.利用Yb 4f和C 1s的谱峰强度确定出相纯样品的化学组分接近Yb2.75C60,这一结果与晶体x射线衍射结果一致.Yb 4f和Yb 4d的峰形与峰位表明化合物中Yb的价态为Yb2+.相纯样品(Yb2.75C60)的C
关键词:
60的Yb填隙化合物薄膜')" href="#">C60的Yb填隙化合物薄膜
x射线光电子能谱
Yb价态 相似文献
73.
XuHuagen XuHushan LiWenfei ZhanWenlong XiaoGuoqing GuoZhongyan SunZhiyu LiChen ChenRuofu MaYue ZhangXueying JiaFei 《近代物理研究所和兰州重离子加速器实验室年报》2003,(1):115-115
With the construction of the new Radioactive Ion Beam Line in Lanzhou (RIBLL Ⅱ) which connecting the CSRm and the CSRe, an experimental setup.The Time-of-Flight (ToF) technique was recognized as one of the best ways for neutron detection and it, is employed by the neutrons wall. Considering the high neutron multiplicity, the detector shouldal so have the ability to resolve the multiple hits. Moreover, a high detection efficiency for the neutrons with energies ranging from 100MeV to 1 GeV is also required besides the high granularity. In this case, the sampling hadronic calorimeter type of detector has been selected. In order to estimate the performance of the detector and 相似文献
74.
75.
论述了在塔里木盆地皮山-沙雅连线西北的塔克拉玛干沙漠西北边缘地带的流动沙漠区域进行的现场风洞试验.在试验中采用了四种形状的防沙墙,分别为直线型、半圆型、三角型、M字型.观测和测试了用不同形状的防沙墙时,沙波形成和性质的改变,同时进行了对比分析,为今后的计算机数值模拟提供了试验依据. 相似文献
76.
77.
Monte Carlo simulation is used to study the low energy He ion channelling in a (17, 0) single-wall nanotube and its rope. The simulation shows that the channelling critical angle ψc = 48E^-1/2 (E is incident energy) for a 1.31-nm-diameter initial beam into the nanotube, while ψc = 45E^-1/2 for the 1.31-nm-diameter initial beam into its rope. 相似文献
78.
79.
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
80.