This paper is concerned with the motion of water-droplet on rotating disk.It is found that the contact angle hysteresis [1] plays the essential role to deviate the droplet against the Coriolis force d
Microcapillary-based BioMEMS systems have recently gained increasing attention with special interest in precisely positioning and electrically analyzing single cells [1-3].Existing fabrication schemes
In this study,a stable and fast method for culturing mouse neural stem/progenitor cells (mNS/PCs) in three-dimensional (3D) type I collagen gels,based on microfluidics,is described.First,the collagen-
We have developed an originally designed microfluidic device for single cell isolation [1].For the detection of expressed gene in isolated cells on the device,hot cell-direct RT-PCR method was invente
For protable devices,fuel cells have been a competitive candidate as a microscale power source and methanol is a suitable liquid fuel for producing hydrogen because of its high production capacity and
Raman-activated cell sorting (RACS) offers prospects to complement the widely applied fluorescence-activated cell sorting.RACS enables the separation of cells according to their intrinsic chemical ‘fi
应用分数阶导数湍流扩散理论考察不同初始条件下悬移质含沙量垂向分布的演化过程.基于对流-扩散方程和分数阶导数动力学理论,发展了一维非平衡状态下的分数阶导数方程模型,模拟了静水和稳态分布初始条件下悬移质的动态演化过程,分析了影响含沙量变化的因素.
以蛋清为试验材料,模拟黏性泥石流残留层,通过40组试验数据进行分析研究.试验研究了残留层平均厚度、平均密度和斜坡坡度的变化对糙率的影响.试验结果表明:糙率与残留层平均厚度和平均密度成正比关系,与斜坡坡度成反比关系.
通过理论和数值模拟研究发现:三方程模型并没有以往所公认的"耗能在长距离内大于产能"缺陷;实际上,无论是三方程模型还是四方程模型,泥沙再悬浮越多,产能相对于耗能越多,符合浊流的自加速特性.这是因为泥沙再悬浮进入异重流后,沿陡坡向下游运动过程中,重力势能转化为异重流湍流能量所致.
在实验水槽中进行了16组清水冲刷实验,以研究均匀与非均匀推移质在恒定与非恒定流条件下的输移规律.实验结果表明:在非恒定流条件下,均匀或者非均匀推移质输沙率比等水量恒定流条件下的输沙率要大;并且,床沙越粗,这种非恒定流对推移质输移的增强作用就越明显;反之亦然.另外,不管是在恒定流还是非恒定流条件下,混合床沙中的细沙都会促进粗沙的输移,而粗沙则会抑制细沙的输移;并且,这种促进/抑制作用会随着床沙中细沙