Journal of Physics-Condensed Matter
The vibrational densities of states for a deterministic self-affine aggregate and the two-dimensional Eden hulls are computed numerically by the continued-fraction recursion method. It is shown that in contrast with the geometrical complexity the density of states for the diagonally self-affine fractals exhibits a simple power-law scaling. Motivated by these suggestive results, we extend the work done by Alexander and Orbach in 1982 and conclude that the concept of fractons is still valid in characterizing the vibrational spectra of all diagonally self-affine fractals. We also relate the fracton dimensionality to other exponents.
关键词:
effective-medium approximation;diffusion-limited aggregate;silica;aerogels;clusters;density;states;surfaces;network;model
Journal De Physique Iv
The disordered systems are of fractal structures. Alexander and Orbach showed that the vibrational density of states for fractal nets follow. the universal law:D(omega) similar to omega(2-:) where d is the spectral (fracton) dimensionality;d=4/3 for any Euclidean dimension d. The excitations belonging to this class were named ''fractons''. We have employed a novel numerical method developed by Williams er al. and performed computer simulation. We have pointed out that the connection between the vibration spectrum and the ultrasonic attenuation in sintered metal powders.
关键词:
fractons
Physics of Life Reviews
Commentaries by Philip W.T. Pong, Nongyue He, S.D. Liang, Tao Song, Yuri Gaididei and Sergey Volkov and Alexander Y. Grosberg on my review article (Pang, 2011 [1]) are answered. The validity of Davydov's mechanism of bio-energy transport, the completeness of theory, outstanding problems, the normalization and validity of wave function of the system in Pang' model as well as other related problems are elucidated in detail. (C) 2011 Elsevier B.V. All rights reserved.
关键词:
biological temperature;3 channels;soliton;model
崔可航
,
辛公明
,
程林
,
邹勇
工程热物理学报
通过建立相关测试平台,对一系列环路热管用烧结毛细芯的有效导热系数进行了实验研究,分析了组元配比,孔隙率和浸润工质等参数对有效导热系数的影响.研究发现烧结镍铜毛细芯有效导热系数显著低于单一组元毛细芯,并随着孔隙率的增加而降低,饱和了水的毛细芯导热系数相比干态毛细芯的导热系数有所增加.实验结果与文献中的有效导热系数模型比较,Alexander模型与实验数据拟合最为良好.
关键词:
环路热管
,
毛细芯
,
有效导热系数
吕超
,
张子木
,
赵秋月
,
王淑婵
,
刘燕
,
张廷安
稀有金属
doi:10.13373/j.cnki.cjrm.2015.06.011
采用k-ε湍流模型与Eulerian多相流模型耦合,选择Morsi-Alexander相间曳力模型,对高效澄清萃取槽中液-液两相流做了数值模拟.对不同条件下萃取槽水相出口中油相杂质含量做了详细考察.结果表明:在不同入口流量、不同澄清室搅拌转速、不同搅拌桨离底高度条件下物理实验与数值模拟所得到的水相出口油相杂质含量整体趋势保持一致.澄清室增加搅拌装置能有效降低水相出口油杂质含量,加速油、水两相的澄清分离.通过数值模拟确定了实验条件水油两相入口流量分别为40和80 L·h-1、搅拌转速10 r·min-1、澄清室内搅拌桨离底高度9 cm时水油两相达到了最佳的澄清分离效果.在其他条件一定的情况下,粘度越低,两相间界面张力越小,沉降分离效果越明显.而粘度越高,两相间界面张力越大,搅拌加速分离的效果越明显.
关键词:
双搅拌
,
高效萃取槽
,
实验条件
,
FLUENT模拟
