微栓过滤器的技术设计

近些年来,心脏外科专家们对在体外循环过程中使用微栓滤器以消除转流血液中的微栓的重要性已有共识,因为它常常是体外循环手术成败的关键所在。设计和生产出安全可靠、符合临床要求的微栓过滤器是心脏外科专家们的普遍呼声。为此,本文着重探讨一下微栓过滤器的设计原理和设计技术。 一、微栓过滤器的过滤原理 去除液体中非溶性物质的基本方法主要有吸附和滤隔两种。

抽水试验中常遇问题的分析

分析了水利水电工程钻孔抽水试验工作中如何选择抽水设备、确定抽水孔结构。

Research on Percolation Network and Physical Properties of Graphite/Antimony Composites

The microstructure, friction and wear behaviour of graphite preform and graphite/antimony composites are analysed based on the percolation theory of hydrodynamics to investigate the relationship between the percolation net- work and physical properties of graphite/antimony composites. The result shows that there are two important factors to enhance friction and wear behaviour of graphite/antimony composites at high temperature: 1) the formation of the pore network in the preform, which is called the first percolation and 2) the optimization of infiltration method in the process of infiltrating antimony, which is called the second percolation. By adding some pyrolysate and controlling the roasting process, perfect net pores and sub-micron percolation microstructure may be formed in the graphite preform. By con- trolling the infiltration process, the saturation of molten antimony infiltrating into perfect pores can be optimized.