TiO2胶粒在铝合金表面的电泳沉积及所制薄膜的光催化性能研究

TiO₂ membranes were prepared on aluminum-alloy thin plates by electrophoretic deposition and dip coating in a colloid solution of TiO₂, respectively. The photocatalytic activity of TiO₂ membrane was compared using ethylene as reactant, and the crystal and morphological structure of the membrane were characterized by XRD and SEM. The results showed that a more compact membrane with high loading of TiO₂ but lower photocatalytic activity of unit TiO₂ mass was obtained by electrophoresis compared with dip coating method. The addition of polyethylene glycol (PEG) to the sol of TiO₂ could improve the specific photocatalytic activity (ethylene conversion per unit mass TiO₂ and unit area of membrane piece) of the electrophoresis-membrane prepared from the sol, but could not change the specific photocatalytic activity of the dip-coating membrane from the sol. The ethylene conversion on the electrophoresis membrane prepared from the sol containing PEG (50 g·L^-1) was 9 times of that on the dip coating membrane. The effect of PEG on the properties of electrophoresis-membrane of TiO₂ was attributed to the change of electrokinetic properties of sol. Addition of PEG decreased ζ potential value of the sol and the mobility of the sol particle, increased viscidity of the colloid, thus decreasing both the electrophoresis deposition velocity of colloid particles and the electroosmosis velocity of diffuse layer of colloid particles. These favored the formation of a low compact and porous membrane on the electrode in electric field, and thus increasing the availability of TiO₂ in photocatalytic process.     

镝铁氧体／聚丙烯酰胺磁性复合微球的制备及其表征

微舍微乳液聚合和纳米反应器两种技术。在W／O微乳液体系中制备出镝铁氧体／聚丙烯酰胺磁性复合微球。通过IR，XRD，TEM，TG等分析测试手段对产物结构、粒径、形貌等进行了表征。同时对复合微球的磁响应性进行了初步研究。结果表明：所制得的磁性复合微球具有良好的磁响应性和悬浮稳定性。     

注射用舒尔哌酮的高效液相色谱分析

建立了高效液相色谱法分离与测定复方制剂舒尔哌酮中斯巴坦及头孢哌酮的含量。采用Ｃ_（１８），１０μｍ，４．６ｍｍ×２５０ｍｍ（大连化物所Ｓｐｈｅｒｉｓｏｒｂ）柱，以０．２５％三乙胺溶液（用磷酸调ｐＨ６．０）＋乙腈（８６．５＋１３．５）为流动相，在紫外检测器２１０ｎｍ波长处进行检测，线性范围０．０５～０．６ｍｇ／ｍＬ，γ＝０．９９９９（ｎ＝５），精密度：斯巴坦及头孢哌酮的日内平均ＲＳＤ分别为０．６％及０．７５％（ｎ＝１８），日间平均ＲＳＤ分别为０．８６％及０．８７％（ｎ＝１２）。     

深圳蔬菜安全风险评估与抽样检验方案设计

运用模糊数学模型和食品安全指数IFS模型进行安全风险评估,对深圳市新鲜蔬菜批发市场、农贸市场、超市及零售店等常规渠道与其他输入渠道进行模糊评价,得出食品安全风险等级,构建了蔬菜安全风险评估层次结构模型,评估出深圳市新鲜蔬菜安全风险较高。对已有的抽样方案进行改进,设计了两套深圳市新鲜蔬菜抽样检验方案,分别适用于深圳市所有的蔬菜交易市场和销售蔬菜的超市、零售店以及蔬菜产地、蔬菜加工厂的样本抽取及实验室试样的制备。     

一类具有四条分界射线的近哈密顿系统的极限环分支（英文）

应用分片光滑近哈密顿系统一阶Melnikov函数方法,研究一类由四个角形区域合成的全局中心的极限环扰动分支.当扰动项为n次多项式时,给出由中心分支出来的极限环的个数的上下界.     

微积分教学改革的一些做法和体会

97—98学年是我的学术休假年，因上海交大的邀请，来交大应用数学系工作．我在美国工作的学校—威斯康星州立大学—LaCrosse校区的数学系曾在美国自然科学基金会资助下搞微积分教学改革，主要是传统的微积分教学与计算机使用的相结合，使原来的理论学习变为计算机屏幕上可见的图形，从而加深了学生的印象，也使学生更能理解和掌握．微积分作为一门大学生入学时的基础课，能打好计算机的基础很重要，为以后学习其他需要与计算机结合的课程打下了良好的基础．另外，由于计算机的迅速发展，其他的数学学科，如数值分析、微分方程、数理统计等…     

Synthesis and structure of catena cadmium complex with 2-hydroxo-l-naphthaldehyde thiosemicarbazono tetradentate ligand

The tide ligand (H2L) and its complex [CdL(py)2]py (L= C12H9N3OS dianionic) have been synthesized and characterized. The complex structure determination indicates that Cd( Ⅱ ) atom has a distorted octahedral coordination geometry. As an unusual tetradentate ligand, one L2- chelates one Cd( Ⅱ ) atom using the 0, S atoms and one N atom of the hydrazino group while its another N atom links to the neighbouring Cd atom. The bridging hydrazono groups extend the compound into a catena chain. The naphthoxy rings of each neighbouring unit are alternatively arranged at opposite sides of the chain, and the ring planes on the same side are parallel.     

蔬菜重金属污染研究进展与防治措施

通过对国内外蔬菜重金属污染的研究现状、污染来源、蔬菜对重金属的吸收与富集规律、重金属对蔬菜生理生化效应的影响等方面的论述,探讨了蔬菜中重金属污染的控制方法,为开展蔬菜重金属污染防治提供参考和借鉴.