玄武岩纤维材料在酸、碱性环境下的耐久性试验研究*

为了解玄武岩纤维本身的耐酸、耐碱性能,对其在80℃2 mol/L盐酸和氢氧化钠溶液中腐蚀不同周期后的质量变化、单丝强度进行了试验研究,并与聚丙烯纤维、耐碱玻璃纤维的耐酸碱性进行了对比。结果表明,在耐酸性能方面,玄武岩纤维最优,其次是聚丙烯纤维,耐碱玻璃纤维表现最差;在耐碱性能方面,表现优劣依次为聚丙烯纤维、玄武岩纤维和耐碱玻璃纤维。试验结果为玄武岩纤维新材料在水泥混凝土中的推广应用提供参考。     

Improvement of oil/water selectivity by stearic acid modified expanded perlite for oil spill cleanup

Ecological disasters and economic losses resulting from oil spills have reminded us the necessity for finding an environmentally friendly, cost-effective, and available in large-scale materials to minimize the oil spill effects. The development of high oil/water selectivity mineral sorbent for the removal of oil from the water is of great interest for oil spill cleanup. In this work, highly oil/water selectivity sorbent of expanded perlite modified with stearic acid was prepared by solution-immersion processes, and the characterization of sorbent was analyzed by Fourier transformation infrared (FT-IR) spectroscopy technique. The optimized amount of loaded stearic acid (SA) on the expanded perlite surface was found to be 2.0%. Then the sorption characteristics of unmodified expanded perlite (UMEP) and stearic acid modified expanded perlite (SMEP) were tested. The effects of different particles size, oil/water volume ratio and sorption simulated condition were investigated. It was found that expanded perlite modified with stearic acid could adsorb selectively oil from water in oil/water system. The maximum oil/water sorption ratio of SMEP was 46, which was about 191 times that of UMEP (0.24) in studied experimental range. The FT-IR analysis demonstrated the presence of long-chain alkyl group in the SMEP samples, which played an important role in oil/water selectivity of SMEP samples. The equilibrium were tested with Langmuir and Freundlich isotherm models, and oil sorption process of SMEP showed good correlation with the Langmuir isotherm model.     

BIOCHEMICAL STUDIES ON GLUCOAMINOGLYCANS CONTENT IN AFFECTED CARTILAGE HYALURONIC ACID LEVELS IN SERUM AND SYNOVIAL FLUID OF IDIOPATHIC FEMORAL HEAD NECROSIS

Ｍｏｓｔｏｆｒｅｓｅａｒｃｈｅｓｏｎｔｈｅｐａｔｈｏｇｅｎｅ－ｓｉｓｏｆｉｄｉｏｐａｔｈｉｃｏｓｔｅｏｎｅｃｒｏｓｉｓｌａｉｄｐａｒｔｉｃｕｌａｒｅｍｐｈａｓｉｓｏｎｔｈｅｏｓｔｅｏｐａｔｈｏｌｏｇｙ，ｈｅｍｏｒｒｈｅｏｌｏｇｙ，ｂｉｏｍｅｃｈａｎｉｃａｌａｎｄｃｈｏｎｄｒｏｐａｔｈｏｌｏｇｙ〔１，２〕．Ｔｈｅｒｅｈａｓｂｅｅｎｎｏｓｔｕｄｙｏｎｔｈｅｃｈｏｎｄｒａｌｆｕｎｃｔｉｏｎｂｉｏｃｈｅｍｉｃａｌｃｈａｎｇｅａｎｄｉｔ′ｓｒｏｌｅｓｉｎｓｔｅｒｏｉｄａｖａｓｃｕｌａｒｎｅｃｒｏｓｉｓｏｆ…     

机车专用10 kW放电机的设计

介绍了一种基于BOOST拓扑电路的铁路机车专用110V／10kW放电机。主要从其电路拓扑结构、参数选择、控制系统的设计等方面进行了研究，最后给出了试验波形。     

柠檬酸酸洗废液处理中活性污泥的培养与驯化

针对柠檬酸酸洗废液的处理，取大连开发区污水处理厂经脱水干化的活性污泥作种泥，将生活污水与柠檬酸废水以一定比例混合，进行污泥的培养与驯化．驯化中不断增加柠檬酸废水的比例，使CODcr从330mg／L逐渐上升到1982mg/L，在水温：20℃～25℃，溶解氧：4．0～5．0mg／L，pH值：6．5～8．0，SVI：30％左右，MLSS：2～4mg/L的条件下，经过7d的培养驯化，柠檬酸废液CODcr的去除率达到90％以上，15d，生物反应器中微生物繁殖良好，形成稳定的活性菌胶团絮体，结果表明：试验控制条件适宜，驯化好的活性污泥对柠檬酸酸洗废液中的有机物去除效果稳定，达到了预期的目的。     

羟胺酸金属络合物的合成

通过Ｎ－芳基羟胺酸在水或醇中与金属卤化物直接反应生成了一系列羟胺酸过渡金属络合物，并由元素分析、红外光谱分析得到证实。     

酸雨环境下钢管混凝土柱轴压性能研究

通过通电方法对钢管混凝土试件进行加速腐蚀,分析混凝土强度、长细比和酸雨溶液p H值等参数对受酸雨腐蚀后钢管混凝土柱的轴压力学性能影响,并与未腐蚀钢管混凝土柱的轴压力学性能进行对比。分析结果表明:钢管腐蚀会引起钢管混凝土柱的套箍系数降低,从而导致钢管混凝土柱承载力和刚度下降,最终影响结构的安全性;酸雨腐蚀后钢管混凝土柱的承载力随内填混凝土的强度等级提高而增大;随钢管混凝土短柱的长细比增大而减小。     

CO2电化学还原合成甲酸的研究

研究了电解液中的阳、阴离子以及KHCO3浓度对CO2合成甲酸电流效率的影响,并分析了反应的初始物种.结果表明,在含有不同阳、阴离子的电解液中.甲酸电流效率的高低顺序为K >Na >Li >NH 4和PO3-4相似文献   

聚羧酸高性能减水剂在南宁枢纽工程中应用

聚羧酸高性能减水剂作为新一代混凝土减水剂,以其优异的性能在高速铁路工程建设中发挥了积极的作用。根据施工现场的试验,在分析了聚羧酸高效减水剂性能特点的基础上,针对桥梁桩基、墩身、承台、现浇梁等结构用混凝土的特殊要求,提出了适合于工程各个部位应用聚羧酸减水剂的性能要求和优选原则,并阐述了聚羧酸减水剂在工程混凝土应用中遇到的问题和解决方案。     

腐殖酸污染膜的超声波强化清洗

中水回用过程中制约超滤有效运行的关键是有机物污染问题.以腐殖酸污染的聚醚砜（PES）超滤膜为研究对象,利用超声波清洗方法,在不同的清洗环境中对污染的超滤膜进行强化恢复研究.结果表明,与传统化学清洗工艺相比,超声波清洗可以显著提高清洗效果,缩短清洗时间.当超声波传播方向与膜垂直时,利用超滤出水作为清洗介质,在37℃水温下,清洗效果较好,通量可恢复至93%.