On the basis of study on structure and mass transfer , ideal model of membrane structure was built up , in which skin layer should be as thin as possible ensure resisting water to pass though membrane ; finger pore should be as long as possible in the membrane ; proper pore size ; loose sponge tissue 首先对利用相转化法制备的微孔膜形态结构进行研究，确定传导阻力较小的理想结构模型，致密层在能阻止微孔被浸润的情况下尽可能薄；指状孔在膜厚方向所占比例尽可能大；孔径大小适宜；海绵状组织结构疏松。
A review with 27 references , introducing the variety , ch aracte ristics and pathogen of transmissible spengiform encephalopathy ( tse ) , and the s ympotom of bovine spongiform encephalopathy ( bse ) and it s infectious pathways , summarizing relations between bse and creutzfeldt jakob disease ( cjd ) bas ed on a large number results of experiment research 介绍了传染性海绵状脑病的种类、特点和病原体，以及牛海绵状脑病( bse )的病征及感染途径，并根据大量实验研究结果对牛海绵状脑病与人海绵状脑病之间的关系进行了综述。
Even though hms can be prepared much more easily than mcm - 41 and has certain advantages such as thicker framework walls , superior thermals stability , and a smaller crystalline size . hms have more recently been shown to possess wormhole - like or sponge - like framework structure rather than the long - range hexagonal framework structures characteristics of electrostatically assembled mcm - 41 . the wormhole channel motif is a potentially important structure feature for favorable catalytic reactivity , in part , because channel branching within the framework can facilitate access to reactive sites on the framework walls . furthermore the wormhole channel motif suggest that they could serves as ideal hosts for rational nanomanufacturing 1995年， tanev和pinnavaia报道，用中性模板剂合成了一类新的六方介孔固体( hms ) ，它具有不同于用静电路径合成的mcm - 41介孔固体的物理和化学性能，如制备工艺简单、孔壁厚、热稳定性好和晶粒尺寸小等。 hms还具有蜂巢或海绵状结构特征，而不象mcm - 41那样是长程有序的六方结构。这种蜂巢或海绵状结构特征除有利于催化反应，反应物易于接近孔壁上的反应位外。
