氯离子对碳钢在混凝土孔隙液中腐蚀行为的影响

采用重量法、线性伏安扫描法、弱极化法和SEM,研究C l-对碳钢在模拟混凝土孔隙液(饱和Ca(OH)2溶液)中的腐蚀行为的影响.结果表明,高pH值的混凝土孔隙液能减缓氯离子对碳钢的腐蚀;当pH≥13.6时,在NaC l浓度小于3%的混凝土孔隙液中,碳钢表面因生成钝化膜而不被腐蚀;当pH≤9时,混凝土孔隙液中无论是否存在C l-,碳钢均会被腐蚀;当pH=12.5时,混凝土孔隙液中NaC l浓度小于0.05%,碳钢则不被腐蚀;当混凝土孔隙液中的C l-浓度达到临界氯离子浓度时,碳钢表面的钝化膜开始损坏而被腐蚀,碳钢的腐蚀速度随着C l-浓度的增加而增大.     

论贾瑞之死

论贾瑞之死王志尧，仝海天人生自古谁无死？这的确是一条亘古不变的自然法则，任何人也无法幸免。但死的意义有不同，同样是匆须争论的公理。一部《红楼梦》，扬扬洒洒，百余万字，写死人的事也占了相当的份量。从女性来说，较为重要的就有“贾夫人仙逝扬州城”；“秦可卿...     

Tl^3^+─H2O2─Fe^2^+体系的反应动力学研究

本文用Tl(I)离子选择性电极测定了Tl^3^+-H2O2-Fe^2^+体系的反应参数, 据此计算了该体系的反应级数, 得到了反应速率方程式, 对该反应体系的反应机理进行了探讨, 并用稳态处理法对所提出机理进行验证, 其结论与实验所得速率方程完全符合。     

红细胞生成素单克隆抗体制备及初步鉴定

为获取高效价的红细胞生成素（ＥＰ）单抗,以建立重组人红细胞生成素（ｈＥＰＯ）测定方法。用基因重组ｈＥＰＯ与小鼠血清白蛋白经Ｎ－羟基琥珀酰亚胺基－３（２－吡啶基二硫）丙酸酯胞;用间接ＥＬＩＳＡ和免疫印迹技术将ｈＥＰＯＭｃＡｂ与白色念珠菌胞质抗原的ＭｃＡｂ,嗜肺性军团病杆菌ＭｃＡｂ,ＨＣＶ核心肽ＭｃＡｂ,人μ链ＭｃＡｂ,ＩＦＮ－γＭｃＡｂ的间接ＥＬＩＳＡ同时进行特异性鉴定。经融合后检测获取一株分泌ｈＥ     

Preparation of a novel self-assembling nonlinear optical (NLO) polymer film

A novel self-assembling crosslinking second harmonic generation nonlinear optical (SHG/NLO) film with high SHG coefficient (2×10-7 e.s,u.by IR dichroism) was prepared by morecular design and "in-situ poling and sol-gel process".The content of the NLO chromophore (S)-(-)-1-(4)-mtrophenyl-2-pyrrolidinemethanol (NPP) is as high as 50 mol% since NPP molecules probably disperse in the film at a molecular level The film is rigid,uni form and transparent.This designed clathrate supermolecular structure was poved by IR,atomic force microseopv (AFM) and differential scanning calorimetry (DSC) detection.The title film exhibits a long-term temporal stability with 95% of the initial value of SHG coefficient maintained even after 20 d at 65℃(by UV spectroscopy)     

SYNTHESES OF THE SOLUBLE,HIGH MOLECULAR WEIGHT AND LADDERLIKE POLYPH ENYLSILSESQUIOXAN E AND COPOLYMETHYLPHENYLSILSESQUIOXANES BY PREAMMINOLYSIS METHOD

Soluble, high molecular weight (MW) and ladderlike polyphenylsilsesquioxane (LPPSQ) and its copolymers, ladderlike random and block copolymethyiphenylsilsesquioxanes(LR-PMPSQ and LB-PMPSQ)have been prepared by preamminolysis, hydrolysis and polycondensation reactions. The preparation method can be carried out easily at the temperature below 95℃with high yield of 95 %, instead of the conventional way by using high-boiling solvent and any reaction activator or by precipitation with methanol. Three kinds of ladderlike polymers have been characterized. The MW's of the polymers reached to 10~6 without noticeable gelling. The scheme for synthetic route has been proposed.     

无线-光混合接入技术和光纤无线技术方案研究

基于无线接入和光纤技术的特点,介绍了目前无线-光混合接入技术和光纤无线技术的研究现状,并针对每种研究方案进行了分析与比较同时,提出了基于用户端上变频技术的无线-光混合接入方案,从而为无线-光混合接入技术的研究提供一些参考.     

开展拓展训练对大学生整体素质的影响研究

本文通过对拓展训练的介绍,深入分析拓展训练作为体验式学习模式的先进性。根据当前高等院校学生的特点,系统地阐述了拓展训练在发展学生健康的体质、培养良好的沟通能力、创造性思维、团队协作、社会适应能力等方面的作用,旨在为探索高校大学生整体素质的提高提供新途径。     

用DPCI-Os(Ⅳ)-OP-10体系分光光度法测定痕量锇的研究

研究了在OP-10存在下用二苯碳酰二肼测定痕量Os(Ⅳ)的分光光度法。8_570nm=3.50×10⁵L·mol^-1·cm^-1,特征灵敏度为0.057μg/10mL(对应1％吸收)。Os(Ⅳ)与DPCI的组成比为1:1。在0.1～5.0μg/10mL范围内符合比耳定律。