酸碱综合腐蚀条件下混凝土的防护研究

针对混凝土在腐蚀环境中的防护工作,特别是在酸碱综合腐蚀条件下混凝土防护出现的问题,采用材料腐蚀学基本原理,分析不同类型混凝土防护材料的特性、腐蚀机理及其对混凝土防护失效的影响因素。为在酸碱综合腐蚀苛刻条件下混凝土的防腐蚀可靠性设计及正确使用提供重要依据。     

添加NaCl对亚甲基蓝电化学脱色过程的影响研究

以Pt片做工作电极和辅助电极,NaCl为活性电解质构成实验用50mL电化学反应器,研究了水相中亚甲基蓝的电化学脱色过程。通过改变pH值、电流密度、染料浓度和NaCl浓度等调控因子,考察了不同条件下的降解过程。实验结果表明,添加NaCl可提高电解效率,在NaCl浓度为0．2mol／L、电流密度为10mA／cm^2和室温条件下,5mg／L的亚甲基蓝经电化学降解1h,脱色率可达91．8％。pH对亚甲基蓝的脱色率影响较大,初始pH越小,脱色率越高。     

PFOS受控的公约进展及中国消防行业使用PFOS情况

介绍《关于持久性有机污染物的斯德哥尔摩公约》受控物名单增列PFOS的基本情况,特别是针对消防行业使用PFOS的控制措施,以及中国相关部门针对PFOS受控状况开展的相关研究及应对策略。介绍中国消防行业针对PFOS受控所展开的相关基础性研究,分析中国含PFOS泡沫灭火剂的生产及库存情况、应用情况以及替代品/替代技术研究情况,以此为基础提出初步战略对策。     

介电性弹性体的研究进展

综述了介电弹性体的种类、性能、制备方法与主要发展方向,概述了介电弹性体驱动性能的表征方法,提出了制备高介电低模量介电弹性体的几点建议。     

仲氨改性剂制备低黄变氨基硅油的研究

以仲氨改性剂γ-环己基甲基二甲氧基硅烷（氨基硅烷偶联剂）和八甲基环四硅氧烷（D4）为原料,在氢氧化钾（KOH）催化下,制备了低黄变的氨基硅油。较佳合成条件为：氨基偶联剂用量为4.0%,反应时间为4.5 h,反应温度120℃,催化剂用量为0.10%,制得氨基硅油,将其用于纯棉布后整理,能赋予织物较好的柔软性、平滑性、蓬松性、低黄变性以及亲水性。     

A ruggedness test strategy for procedure related factors: experimental set-up and interpretation

A strategy to perform ruggedness tests for mainly procedure related factors is described. The different steps in the set-up of the experiments and in the interpretation of the results are given. The described strategy is based on a number of case studies and allows a statistical interpretation of the significance of the effects. It was implemented in a software tool. This original strategy was completed with a number of minimal screening designs which reduce the number of experiments to perform, but in consequence only allow a limited or no statistical interpretation of the effects. Some of the minimal designs are expandable to designs with characteristics similar to those of the original strategy.     

Characterization of a subunit structure and stability of the recombinant porin from Neisseria gonorrhoeae

An outer membrane PIA protein from Neisseria gonorrhoeae strain FA19 was expressed in Escherichia coli and refolded in vitro in the presence of zwitterionic detergent. Its proper folding and subunit organization was confirmed by comparison with the native counterpart. The unfolding of PIA has been investigated using fluorescence spectroscopy and analytical size-exclusion chromatography methods. Analysis of the denaturation pathway of the PIA revealed that it forms an unusually labile quaternary structure. In the presence of 1 M guanidinium chloride (GdmCl) or upon heating up to 50 degrees C, dissociation of the PIA oligomer was observed resulting in the formation of folded monomeric intermediates. Unfolding of monomers occurs at 80 degrees C or in the presence of 4.3 M GdmCl, indicating high intrinsic stability toward both GdmCl and elevated temperatures. Both oligomeric and monomeric forms of PIA exhibited affinity to the hydrophobic probe 1-anilinonaphthalene-8-sulfonic acid (ANS) and bind with Kd=80 and 130 microM, respectively. Denaturation of the PIA completely abolished affinity to ANS, suggesting that hydrophobicity is a property of the folded state of the porin.     

Borrelia burgdorferi sensu lato in Russia and neighbouring countries: high incidence of mixed isolates

A total of 365 isolates of Borrelia burgdorferi sensu lato from 12 major administrative territories of Russia (from St. Petersburg in the west to South Sakhalin in the east) and from the Czech Republic, Estonia, Lithuania, Byelorussia, Moldavia, Ukraine and Kirghizia were identified by analysis of restriction polymorphism of ribosomal rrf-rrl spacer amplicons. The isolates were obtained mainly from ixodes persulcatus and I. ricinus ticks. Other sources included small mammals, human patients and I. trianguliceps ticks. The results showed that B. garinii (two variants) together with B. afzelii circulated throughout the territories studied. The distribution of the variant NT29 of the species B. garinii, the most frequently isolated, was associated with that of I. persulcatus ticks. B. burgdorferi sensu stricto, and the species B. valaisiana and B. lusitaniae (formerly the genomospecies VS116 and PotiB2, respectively) were isolated only from I. ricinus ticks in the western part of the studied territories. None of these three species were found in 327 isolates from Russia where I. persulcatus is the most frequently distributed vector. This work also provides evidence for a high incidence of mixed Borrelia infections within vectors and hosts (9.3% of isolates were mixtures of Borrelia species). A detailed analysis of Borrelia species distribution over the territories studied is presented.