超高光束质量研究

提出了边界波具有p 跃变性质的假说,作为惠更斯–菲涅耳原理的补充。根据该假说,在腔外和腔内实现了一系列新光束。重要的是,实现了等效光束质量因子小于1的新光束CO2激光器。这可看作是可控非线性自聚焦的结果。     

SBR——膜联用技术在中水回用中的发展与应用

SBR-膜联用技术是集SBR和膜技术各自优点的一种新技术,该技术可以在中水回用中起到积极作用。介绍了SBR-膜联用技术的几种工艺及其特点,指出该技术应用于中水回用,为解决水资源短缺问题提供了强有力的技术支持。     

Phase behaviour of polyethylene knotted ring chains

The phase behaviour of polyethylene knotted ring chains is investigated by using molecular dynamics simulations. In this paper, we focus on the collapse of the polyethylene knotted ring chain, and also present the results of linear and ring chains for comparison. At high temperatures, a fully extensive knot structure is observed. The mean-square radius of gyration per bond ² / (Nb²) and the shape factor <δ^*> depend on not only the chain length but also the knot type. With temperature decreasing, chain collapse is observed, and the collapse temperature decreases with the chain length increasing. The actual collapse transition can be determined by the specific heat capacity C_v, and the knotted ring chain undergoes gas-liquid-solid-like transition directly. The phase transition of a knotted ring chain is only one-stage collapse, which is different from the polyethylene linear and ring chains. This investigation can provide some insights into the statistical properties of knotted polymer chains.     

浅谈企业人力资源的开发与管理

阐述了企业人力资源的开发与管理问题,包括实现人力资源管理者的专业化,实现人力资源的战略规划,实现人力资源招聘的科学化,以及实现人力资源的有效培训.     

制药废水二级出水混凝沉淀对比试验

选定3种混凝剂对某制药厂制药废水的二级出水进行混凝沉淀对比试验。首先用单因素试验确定3种药剂的最佳用量和pH值范围,然后用正交实验方法对影响混凝效果的因素进行了研究。结果表明：在室温（15℃）条件下,CODcr去除率主要受pH值影响,浊度去除率主要受混凝剂种类影响。PAC投加量为120mg/L,pH值为8.0时,CODcr去除率效果最好,去除率为69.89%,浊度去除率为61.95%,使水质较差的二级出水得到进一步净化。