有机硅改性丙烯酸酯共聚乳液合成方法及胶膜性能的研究

用一次投料法、单体乳液滴加法和引发剂滴加法有机硅改性丙烯酸酯共聚乳液，聚合过程、胶粒形态及乳液稳定性的观测结果表明：单体乳液滴加法是合成该类乳液的最佳方法，研究了单体乳液滴加法中有机硅含量与聚合反及胶膜性能的关系，结果表明：有机硅含量在１５％以下时，聚合反应可以顺利进行，胶膜性能不仅依赖于聚合时有机硅单体的总量，而且还依赖于有机硅单体中活性硅氧烷所占的比例。  

TiO2负载膜的制备、表征及光催化性能

采用溶胶－凝胶法制备了ＴｉＯ２纳米浸渍 法将其负载于颗粒形活性炭的表面制成ＴｉＯ２负载，利用ＳＥＭ，ＥＤＳ和ＸＲＤ等手段对膜的形貌、均匀性及晶型等进行了表征，并通过甲基橙水溶液的光催化降解反应考察了该负载膜的光催化活性。  

Critical flux concept for microfiltration fouling

Several constant-flux filtration experiments for yeast cell suspensions, yeast cell debris, and dodecane-water emulsion were performed at various operating conditions in both flat-sheet and tubular-membrane systems. The aim of the paper is two-fold. Firstly the relationship between constant-flux behaviour and membrane fouling is discussed. In some cases constant-flux filtration was realized at a constant transmembrane pressure which was below a critical value. In general constant-flux filtration was obtained with moderately increasing transmembrane pressure, and this approach is shown to have some advantages over normal constant-pressure filtration because it clearly provides for the possibility of avoiding over-fouling and so reduces the severity of fouling. Secondly, the concept of critical flux is introduced. Whilst it has long been recognised that low-pressure microfiltration is much more effective than high-pressure microfiltration, the emphasis in this work is upon the possible existence of a critical flux and the desirability of starting filtration operations at a low flux. The critical-flux hypothesis is that on start-up there exists a flux below which a decline of flux with time does not occur. Equations which may enable identification of the appropriate flux level are included.  

多孔TiO2薄膜自洁净玻璃的亲水性和光催化活性

亲水性多孔TiO2薄膜自洁净玻璃以含聚乙二醇的钛醇盐溶胶前驱体中通过浸渍提拉法制备;随着前驱物中聚乙二醇加入量的增加, 多孔TiO2薄膜表面的羟基含量也增加, 薄膜表面的亲水性增强, 水与薄膜表面的接触角下降为0°. 该亲水性多孔TiO2薄膜自洁净玻璃具有明显的自洁净和易清洗功能. 紫外-可见光透过光谱分析表明, 随着TiO2薄膜中孔径的增大, 光的散射增强, 透光率减小. 该TiO2镀膜玻璃对于紫外线具有吸收作用. 甲基橙水溶液的光催化降解实验表明, 在TiO2薄膜中引入适当大小的微孔可显著增强薄膜的光催化活性, 但当孔径接近400 nm时, 薄膜的光催化活性减弱.  

气体辅助注塑成型技术—一项向传统注塑工艺挑战的未来技术

气辅注塑成型技术是为克服传统注塑成型和发泡成型的局限性面发展起来，近几年来才开始进入实用阶段的一种新工艺。它利用高压气体在注塑件内部产生中空截面，实现气体积压，消除制品缩痕，完成充填过程。  

碱式碳酸锌煅烧制备纳米氧化锌

The reaction process of nanometer ZnO preparation through basic zinc carbonate calcination was investigated via TG-DTG-DTA, IR, XRD and TEM methods. The spectra features and morphology variations of precursor and target products calcinated at different temperatures were investigated. The reaction process was deduced to be three stages, which include breaking of precursor crystallites, their decomposition, and growth of ZnO crystal nucleus. The most appropriate temperature for this reaction was demonstrated to be about 300℃.  

中药材三七提取液近红外光谱的支持向量机回归校正方法

提出近红外光谱的支持向量机回归校正建模方法，以中药材三七渗漉提取液为实际分析对象，对其近红外光谱数据进行预处理和主成分分析后。用支持向量机回归算法建立人参皂苷Rg1,Rb1,Rd以及三七总皂苷的近红外光谱校正模型．以Rg1,Rb1和Rd的HPLC测定值及三七总皂苷的比色法测定值为参照，将本文方法与偏最小二乘回归和径向基神经网络建模方法相比较。结果表明,本文所建模型的预测准确性优于后两者，可推广应用于中药提取过程的近红外光谱分析。  

杂多酸催化剂连续法合成乙酸乙酯

乙酸乙酯是重要的化工原料,它是油漆、人造制革等的溶剂,也是制药、染料、香料等基本有机合成的原料。工业上乙酸乙酯多采用硫酸法间歇生产,存在着设备腐蚀、环境污染、生产不连续、选择性差、最高收率只有70％左右等缺点。近年来有人用分子筛、固载杂多酸为催化剂进行气相合成,活性高,选择性好,但存在着催化剂易流失,原料需汽化到150℃,产品酸值和醇含量不易控制等缺点。我们采用饱和1:12系  

香菇多糖的成分及其分子量研究

从香菇子实体中用０．９％ＮａＣｌ水溶液，８５％乙醇，热水，１％草酸铵，５％ＮａＯＨ／０．０５％ＮａＢＨ４和２％ＮａＯＨ／２％尿素分别提取出四种杂多糖（Ｌ－ＦＩ－Ｌ－ＦⅣｎ）和两种葡聚糖（Ｌ－ＦⅤ和Ｌ－ＦⅥｎ），红外光谱和高效液相色谱分析结果表明杂多糖主要由葡萄糖，葡萄糖醛酸，木糖，甘露糖，半乳糖和鼠李糖组成，而且按照分离过程的进行多糖葡萄糖含量递增，由光散射和膜渗透压法研究了多糖的重均分子量Ｍ，匀  

一种用于中药纯化过程的近红外光谱分析新方法

针对中药大孔吸附树脂纯化过程缺乏在线检测分析手段等问题，提出基于光纤近红外透射光谱的过程分析新方法．以黄连提取物为例，采用HPLC分析测定值作参比，用偏最小二乘算法建立了近红外透射光谱校正模型，并成功地用于预测黄连生物碱在大孔树脂纯化过程中的洗脱曲线．本方法实时、快速，可同时测定洗脱物中盐酸小檗碱、盐酸巴马亭、盐酸药相碱和黄连总生物碱的浓度．预测精度满足工业过程分析要求，为提高中药质量分析水平提供了新的途径．