絮凝法提取木薯黄浆废水中植物蛋白质的效果研究

文章采用混凝技术提取木薯黄浆废水中的植物蛋白质物质,实验通过选取最佳的混凝剂和助凝剂种类及其最佳用量,并研究p H、沉淀时间对混凝效果的影响,为木薯黄浆废水的资源化利用提供科学依据。单因素实验结果表明:分别以1%的PAC、1%的氯化铁和1%的改性玉米淀粉处理木薯黄浆废水,三种絮凝剂的最佳投加量分别为0.133g/L、0.133g/L和0.05g/L,最佳絮凝p H分别为9、2和8,三种絮凝剂的沉淀时间均大于15min时处理效果较佳,此时木薯黄浆淀粉废水的浊度去除率均到达80%以上,COD去除率达到50%。复配实验结果表明:PAC与PAM的复配投加后,PAC投加量为0.02g/L,PAM投加量为0.002g/L,浊度去除率从80%左右上升至98.2%,COD去除率上升至51.8%,复配絮凝剂相比单一絮凝剂提取植物蛋白效果更好。     

酸析-絮凝法处理青霉素、头孢废液的实验研究

采用酸析-絮凝法预处理废液。研究发现当单独处理青霉素废液,COD去除率平均为66.9%,但废液pH值不稳定。而头孢废液处理效果不明显。将两种废液混合处理取得了良好的效果,COD去除率平均达到了89.3%,且pH值比较稳定。达到预处理目的,大大降低了处理费用。     

中国互联网的无尺度现象研究

互联网自1994年进入中国以来,一直保持快速增长. 基于数年来积累的大量一手实际测量数据,我们从不同层面验证了中国互联网无尺度现象的存在,并推算出中国的无尺度网络幂次定律公式.     

Quantum phenomena in Communities of Practice

Although Communities of Practice have become a core concept in understanding how knowledge is managed within organizations, there have been few studies of the praxis of formation of Communities of Practice. In this article, we report on a Grounded Theory study of the members of a previously identified Community of Practice within the UK Higher Education Academy Psychology Network. In addition to providing data on the functioning of the community, the study also revealed a hitherto unrecognized form of community that exhibits all of the characteristics of CoPs yet has only a transient existence that seems to nucleate around an existing core community. Drawing on the metaphor of quantum behaviour, we termed these communities Quantum Communities of Practice. We describe a theory to explain this phenomenon that is grounded in the data from the study. We conclude by discussing the value and validity of our findings and methodology and indicating the next steps we will take in our research.     

Weather phenomena of the Colorado rockies

From field observations in the mountain region of Colorado, it was determined that the major portion of the state's moisture is brought in by the winter cyclones. Winter winds redistribute the snow, and Chinook winds remove a portion of it from the mountain region and adjacent plains.Summer storms of three types tend to redistribute the moisture derived from melting snow. Two types, of almost daily summer occurrence, the regional and local or valley storms, are topographically-confined convection phenomena, which daily transfer small amounts of moisture across divides. Cyclones tend to augment the violence of both other types; anticyclones inhibit the regional storms, but have a negligible effect on the local storms.Numerous barometric, electrical, and optical phenomena of great interest but minor climatic importance are briefly described. Hypotheses explaining the various major and minor phenomena are presented, and possible applications of the results of this and further studies of mountain weather conditions are suggested.