Mn-SOD的纯化方法研究

以嗜热芽孢杆菌B．S110—2所产Mn—SOD为研究对象,对其纯化方法进行了研究,用碱处理的方法替代了传统的硫酸铵分级沉淀蛋白的方法;通过对金属螯合层析中二价金属离子的选择及洗脱液pH的选择,初步建立了一套适合分离纯化Mn-SOD的金属螯合层析体系,为实际生物产品的分离奠定了基础。     

蒸汽冷凝水回收系统改造及效益分析

章简要介绍了疏水阀的类型及选型原则。选择质量好且耐背压的倒吊桶型疏水阀，选择热动力式疏水泵和合适的闪蒸罐，合理敷设管道，将原分散的就地排放的蒸汽冷凝水及其产生的二次蒸汽加以回收利用；通过对疏水阀性价比的比较，得出性能优良的疏水阀及其回收系统在节能上的巨大优势；借鉴国内外同行的先进经验，还提出了今后蒸汽疏水系统改造的方向和应注意的问题。     

Cyanide ions transport from aqueous solutions by using quaternary ammonium salts through bulk liquid membranes

Extraction experiments were carried out to determine the suitable solvent and carrier type. Five different solvents and carriers were used and verified. Trichloromethane and tetraoctyl ammonium chlorides were found to be the most appropriate solvent and carrier type for this study. The coupled transport of cyanide ions in aqueous solutions through bulk liquid membrane (BLM) was investigated using various stirring speeds and temperatures. Cyanide ion transport through BLM technique was analyzed according to coupled non-steady state kinetics of two consecutive irreversible first order reactions. The influences of the kinetic parameters (k_1d, k_2m, k_2a, R_m^max, t_max, J_d^max, J_a^max) for the various stirring speeds in the system were established. The removal and recovery efficiencies of the cyanide ions transported from aqueous solutions in 360 min were 99.4 and 82%, respectively. As the stirring speed was increased, both the efficiency of transport and recovery of cyanide ions from aqueous solutions were increased. On the other hand, for maximum membrane entrance (J_d^max) and exit (J_a^max) fluxes the activation energies were calculated as 21.6 kcal/mol and 10.5 kcal/mol, respectively.     

Use of a liquid chromatograph-ion trap mass spectrometer for end-group characterization of various polyethoxylate materials

The separation and detection properties of various ethoxylated polymers were investigated with atmospheric pressure ionization liquid chromatography/mass spectrometry (LC/MS). Interesting chromatographic elution behavior based on functionality was noted. LC/MS using in-source CID (collision-induced dissociation) and tandem mass spectrometry (MS/MS) detection was compared for end-group identification. Excellent end-group identification was achieved when the end-group molecular weight (MW) was greater than 100 Da and the average MW of the polymer was less than 400 Da by both MS/MS and in-source CID. In cases where the end-group MW was less than 100 Da, because of the low mass cut-off in a quadrapole ion trap analyzer, in-source CID produced the only characteristic end-group ions. The use of a dual scan function allowed investigation of the oligomeric distribution followed by a narrow low-mass scan using in-source CID to generate end-group information. This approach is applicable on instruments without MS/MS capability.     

Improvement of electrochemical properties of PEO–LiTFSI electrolyte by incorporation of boroxine polymers with different backbone lengths

A series of boroxine polymers (BP) with different backbone lengths were synthesized. Polymer electrolytes prepared by blending poly(ethylene oxide) (PEO) and BP with Li(N(SO ₂CF₃)₂) (LiTFSI) were evaluated. Better performance was observed by addition of BP in the PEO based polymer electrolyte. The effect of the backbone length of BP on electrochemical properties of PEO–BP–LiTFSI electrolyte systems was investigated. Compared with the PEO–LiTFSI system, about five times higher ionic conductivity at low temperature and five times higher lithium ion transference number at 70°C were achieved by incorporation of long chain BP in the electrolyte. Short chain BP exhibited outstanding performance in decreasing interfacial resistances on both anode and cathode surfaces. Good battery performance was also observed for these BP containing hybrid polymer electrolytes.     

离子注入Cu薄膜的氧化行为研究

研究了用强流金属蒸汽弧离子源（ＭＥＶＶＡ源）注入Ｃｒ对Ｃｕ薄膜的抗氧化性能、导电性能和氧化特征的影响。利用Ｘ射线衍射、Ｒｕｔｈｅｒｆｏｒｄ背散射和扫描电镜 离子注入前后氧化物结构和氧化物形态演变。结果表明,在薄膜的表面层注入一定剂量的Ｃｒ能有效地改善Ｃｕ薄膜的抗氧化性能,而对薄膜的电导性能无显著影响;离子注入显著影响薄膜表面氧化铜的结构和形态。探讨了离子注入对氧化铜结构和形态的影响机理。     

铜合金表面元素的飞行时间二次离子质谱微区原位分析

铜合金中含有Pb、Sn、Zn、Ni等元素,其分布和相对含量对铜合金的性能具有重要影响。本工作采用飞行时间二次离子质谱（TOF-SIMS）法对铜合金标准样品GBW02137和GBW02140的表面进行了微区原位分析;采用束斑直径约5 μm的一次离子束轰击500 μm×500 μm区域内的混合固体合金样品,实现了Cu、Pb、Ni、Sn和Zn元素的表面成像,并测量了各元素在铜合金样品表面的分布情况;利用标样校准法对GBW02137、GBW02140中的⁶⁴Zn/¹²⁰Sn、²⁰⁸Pb/¹²⁰Sn值进行相对含量分析。实验结果表明：TOF-SIMS法可用于铜合金中Cu、Pb、Ni、Sn和Zn等元素的表面成像和相对含量测定;采用标样校准法进行相对含量分析时,测得的⁶⁴Zn/¹²⁰Sn相对误差小于5.1%,RSD优于2.5%,²⁰⁸Pb/¹²⁰Sn的测量相对误差较大,接近27%,但其RSD仍低于5%。     

不同氧化剂对单镍盐电解着色的影响

研究了不同氧化剂对单镍盐电解着色的影响。结果表明,无钠宽温氧化剂与常温氧化剂对单镍盐电解着色影响甚微,可以生产稳定的香槟色铝型材料,但含钠宽温氧化助剂对单镍盐电解着色影响较大,不易得到均匀稳定的香槟色铝型材料。     

中原油田注水系统控制SRB和硫离子技术研究

实验研究了注水系统控制SRB和硫离子的技术.结果表明:氧化剂投加浓度达到30mg/L时,来水中的SRB基本除去;SRB在pH值为6.0~8.0比较活跃,7.0~8.0最适宜生长,9.0以上SRB生长受到抑制;pH值在6.0~8.0时硫离子的含量降低不明显,在36h后降低70%以内,而pH在9.0~10.0时72h后降低85%以上;随pH的增加含硫量降低,在9.0~10.0时降低比较显著.     

Cl-对CO2环境下的碳钢腐蚀影响

为了研究Cl-对CO2环境下的碳钢腐蚀影响,通过挂片失重实验、腐蚀产物膜形貌观察和腐蚀电化学测试,从多角度分析了Cl-对CO2环境下的碳钢腐蚀影响规律.失重实验表明,20#低碳钢的腐蚀速率随氯离子浓度的增大,出现先增大后逐渐减小的趋势.从腐蚀形貌观测的结果来看,腐蚀产物膜产生由疏松到致密的变化.腐蚀电化学测试则反映出随着Cl-浓度的增大,扩散控制作用逐渐增强以及试样表面活化面积不断的减少.