石墨基PTFE涂层阴极动态隔膜电解池产H2O2效能

采用自制的石墨基聚四氟乙烯(PTFE)涂层电极做阴极,以Nafion117阳离子交换膜为隔膜,构建动态隔膜电解池,重点研究隔膜、PTFE添加量、阴极电解液循环流量对体系产H₂O₂性能的影响,并考察电极的重复使用性能。结果表明：动态隔膜电解池产H₂O₂的性能明显高于无隔膜或静态实验的方式。当PTFE乳液(质量分数60%)添加量为0.7 mL、电解液初始pH为3、电流密度为5 mA/cm²、阴极电解液循环流量为0.3 L/min时,体系产H₂O₂效果最佳,反应180 min时的H₂O₂产量达到27.43 mg/(L·cm²),此时的电流效率为72.09%,能耗为7.87 kW·h/kg。但是电极的重复使用性能不佳,连续使用5次后,180 min时的H₂O₂产量降至8.99 mg/(L·cm²)。     

歌唱呼吸及其训练方法管窥

本文阐述了正确歌唱呼吸方法的重要性,以及总结了中外多种歌唱呼吸的训练方法.其目的在于端正学生对歌唱呼吸的正确认识,强调正确的呼吸方法是建立歌声之基础.     

不同因素对三维电极体系电极电位的影响

反应器采用颗粒状活性炭为填料，中间位置添加隔膜，研究了不同条件下三维电极体系电极电位的分布规律及其影响因素．结果表明，三维电极阴极和阳极区靠近隔膜处的电极电位绝对值明显高于靠近两极处的电极电位，且阴极和阳极区电极电位绝对值都随外加电压的增大而上升．阴极板材料性质决定了阴极板电极电位的高低：阴极板材料还原性能愈强，其极板电极电位负值绝对值愈大；阴极板材料还原性能愈弱，其极板电极电位负值绝对值愈小．不同厚度隔膜处理不会影响极板电极电位高低，也不会影响阳极反应区电极电位大小，但能提高三维电极体系还原区的还原能力．与低浓度的反应溶液相比不仅提高了阴极反应区电极电位，还能影响极板电极电位的高低．     

高铁酸钡的制备及电化学性能研究

主要研究了正极材料BaFeO4的合成并利用XPS法对产品纯度进行检测。将BaFeO4作为一次性碱性电池中的正极活性物质，研究不同电解质溶液浓度下和不同材质的隔膜下的放电性能，发现以饱和Ba(OH)2和13mol／LKOH混合液为电解质溶液的电池放电比容量最高。另外采用WhatmanGF／A隔膜也可以明显改善高铁酸盐碱性电池的放电性能。     

Evaluation of virus removal in MBR using coliphages T4

A membrane bioreactor (MBR) with gravity drain was tested for domestic wastewater for 65 days. Resultss howed that the effluent quality was excellent, and met with the reuse water standard of China (GB/T 18920-2002). Virus removal in the membrane separation process was investigated by employing coliphages T4 as a tracer. Two microfiltration membrane modules, with pore sizes of 0.22 and 0.1 μm, were used to investigate their effects on virus rejection at the transmembrane pressure of 8.5 kPa. It was found that 0.1 μm membrane had complete rejection of virus, and 0.22 μm membrane had significant rejection of virus. In the longterm operation of this MBR, no significant difference was observed between both pore sizes because the virus concentrations of the effluent in both cases were in the same order. Effluent virus concentration at steady state of MBR running was less than 2 PFU/mL. The removal ratios of coliphage T4 in MF processes were more than 10^5.5. The membrane surface deposits played an important role in the rejection of virus. The formation of cake clay on the membrane surface was the main cause of high rejection of colipbage T4 with MF of 0.22 μm.     

叹人生隔膜伤爱情已逝——鲁迅《伤逝》新论

长期以来,文学史家对《伤逝》的"权威"解读都将《伤逝》局限于五四文本,这些解读几乎都认定《伤逝》是写知识分子追求个性解放的失败,与《伤逝》"原生态"形象的确存在着差距。本文回到"原生态"的形象去细读《伤逝》,认为《伤逝》真实地揭示了人生的困境,将人生隔膜、爱情伤逝上升到了形而上的层面,是一个可以超越五四的文本。     

膨体聚四氟乙烯外科隔膜作为心包替代物在小儿外科临床应用的评价

为了评价膨体聚四氟乙烯外科隔膜（ＳＭ）作为心包替代物在小儿心脏外科的临床应用效果，从５９７例应用实例中随机选出２５６例应用ＳＭ者与７４４例未应用ＳＭ者进行对照观察。结果显示外科隔膜可预防术后心脏和近心大血管与胸骨后的粘连，从而减少再手术时的危险。ＳＭ组在术后出血、心包填塞、感染等并发症方面与对照组差别无显著性（Ｐ＞００５），提示此种外科隔膜可作为一种有效的，并发症少的心包替代物。     

膨体聚四氟乙烯外科隔膜作为心包替代物在小儿外科？…

为了评价膨体聚甲氟乙烯外科隔膜（ＳＭ）作为心包替代物在小儿心脏外科的临床应用效果，从５９７例应用实例中随机选出２５６例应用ＳＭ者与７４４例未应用ＳＭ者进行对照观察。结果显示外科隔膜可预防术的心脏和近心大血管与胸骨后的粘连，从而减少再手术时的危险。ＳＭ组在术后出血、心包填塞、感染等并发症方面与对照组差别无显著性（Ｐ〉０．０５），提示此种外科隔膜可作为一种有效的，并发症少的心包替代物。     

Nano-Structured Proton Exchange Membrane for Fuel Cell

Nano-structured materials are characterized by long range ordering of the nano-dimensioned quantum dot units. They have been found to deliver substantially different （electric, optical, magnetic and physical） properties from that of the bulk. The differences are mainly due to the increases of surface charge with large fraction of grain boundaries, and the periodical potential field created by the ordered nano-domains. Specifically, the issues considered in “nano ionics” are the degree of interaction, the charge distribution on the interfaces where they become obvious in ionic properties and thermodynamics such as mobility of charge carriers. Major efforts in this direction are focused on：