velocity sedimentation

Only there are three kinds of methods in separation that has been reported both at home and abroad at present sieve method , separation of pollens by velocity sedimentation of pollens , electrostatic separation of pollen ( which is designed mainly use for 2n pollen ) .

目前国内外已报道的分选方法仅有以下三种方法：筛选法、花粉在中间介质中分离的速度沉降法、花粉的静电分选法（主要针对分选2n花粉而设计的）。

Spermatogonia with high purity and viability can be obtained via the steps including digestions with enzymes , velocity sedimentation and discontinuous percoll density gradient centrifugation .

采用复合酶消化、差速贴壁结合非连续性Percoll密度梯度离心的方法纯化精原细胞，能获得纯度和活性较高的精原细胞。

Results The purity of spermatogonia was 91 % after velocity sedimentation separation . 94 % of spermatogonia was obtained after further pruification by attachment culture .

结果重力沉降法分离细胞后所获精原细胞纯度为91%，进一步经过贴壁培养纯化后，精原细胞纯度达到942%。

Several kinds of techniques of detecting DNA single strand breakage in cells are discussed , name-ly , velocity sedimentation , alkali unwinding , alkali elution , and single cell gel electrophoresis , with regard to their principle , limitations , and influence factors .

从检测的原理、局限性和影响因素等方面对几种主要的DNA单链断裂的检测技术包括快速沉降技术、碱性解旋、碱性洗脱和单细胞凝胶电泳进行了综述。

Discussion on Application of the overflow rate and intercept settling velocity for sedimentation tank

沉淀池表面负荷率与截留沉速应用讨论

Results showed that the sludge has good concentration effects when uplifted velocity in sedimentation tube is no more than 5m / h , which has some significance on the design of secondary sedimentation tank and wastewater treatment plants .

研究表明沉淀柱中上升流速小于5m/h时，污泥有较好的浓缩效果。试验结果对二沉池设计和污水厂改造有一定的指导作用。

This study adopts a combination of theoretical and experimental methods , as well as the product development and field application , and the main results achieved are as follows : ( 1 ) It established the relationship of power-law fluid particle settling velocity , sedimentation time and Reynolds number .

研究采用机理研究和室内试验，产品开发与现场应用相结合的方法，取得的主要成果有以下几方面：（1）建立了幂律液颗粒沉降速度，沉降时间和雷诺数的关系式。

In common cases , α - value is related to the velocity of silt sedimentation , depth and shear velocity , hence it is a variable .

在一般情况下，α值与泥沙沉速、水深、摩阻流速等有关，是一个变值。

Main research contents are as follows : The velocity field inside rectangular sedimentation tank is simulated , and the results show that : the inside velocity distributes unevenly , and there are eddy zones in the front-back of the baffle , which will influence the operating effect seriously ;

对平流式二沉池内流场进行了数值模拟，结果表明：沉淀池中的流速并不均匀分布，沉淀池的挡板前后都存在涡流区，影响沉淀池的运行效果。