基于生物膜法和双膜工艺的PVC离心母液回用研究

介绍了采用生物膜法与双膜法联合工艺对PVC离心母液进行深度处理的工艺流程,和在新疆中泰化学股份有限公司进行的中试试验。试验结果表明:基于生物膜反应器的HBF工艺和双膜法的组合工艺处理效果良好,稳定可行,离心母液水中COD去除率在98.5%以上,氨氮质量浓度小于1 mg/L。     

汽轮机调速系统失稳原因分析与处理

解决某N25-35-1型汽轮机调速系统长期失稳问题。通过对该汽轮机调速系统长期失稳现象进行分析、研究,发现机组润滑油油量过多,影响调速系统油量,是导致机组调速系统失稳的主要原因。通过重新分配、调整汽轮机润滑油油量,汽轮机调速系统运行稳定,在机组启动、升速、切换油泵、空载、并网和试带负荷阶段均能正常运行。     

随机系统均方稳定的Lyapunov—型定理

本文研究矩阵方程ＰＡ＋ Ａ′Ｐ＋ Ｃ′ＰＣ＝ － Ｑ 与随机系统ｄｘ ＝ Ａｘｄｔ＋ Ｃｘｄ Ｗ 均方稳定性的关系,所得结果推广了确定性系统ｄｘ ＝ Ａｘｄｔ 渐近稳定性的Ｌｙａｐｕｎｏｖ 定理     

Structure and Formation Mechanism of Antimicrobial Peptides Temporin B- and L-Induced Tubular Membrane Protrusion

Temporins are a family of antimicrobial peptides (AMPs) isolated from frog skin, which are very short, weakly charged, and highly hydrophobic. They execute bactericidal activities in different ways from many other AMPs. This work investigated morphological changes of planar bilayer membranes composed of mixed zwitterionic and anionic phospholipids induced by temporin B and L (TB and TL) using all-atom and coarse-grained molecular dynamics simulations. We found that TB and TL fold to α-helices at the membrane surface and penetrate shallowly into the bilayer. These short AMPs have low propensity to induce membrane pore formation but possess high ability to extract lipids out. At relatively high peptide concentrations, the strong hydrophobicity of TB and TL promotes them to aggregate into clusters on the membrane surface. These aggregates attract a large amount of lipids out of the membrane to release compression induced by other dispersed peptides binding to the membrane. The extruded lipids mix evenly with the peptides in the cluster and form tubule-like protrusions. Certain water molecules follow the movement of lipids, which not only fill the cavities of the protrusion but also assist in maintaining the tubular structures. In contrast, the peptide-free leaflet remains intact. The present results unravel distinctive antimicrobial mechanisms of temporins disturbing membranes.