学界对大汶口文化的研究大多依据墓葬材料,通过对墓葬材料的研究学者发现,海岱地区在大汶口时期发生了剧烈的社会变革,如私有制的产生,阶级的出现以及早期文明的曙光等等,与之相比,对居址材料的研究稍显不足.已有学者注意到,大汶口文化的墓葬材料与居址材料是有较大差别的,尤其是在陶色和纹饰方面.这只是一个小的...
The present invention is for high performance UV-cross-linked membranes from polymers of intrinsic microporosity (PIMs) and the use of such membranes for separations. More specifically, the invention involves the methods of making UV-cross-linked membranes from PIMs. These membranes were prepared by...