Water Bloom Precursor Analysis Based on Two Direction S-Rough Set

In the field of water quality management, it is vital to determine the main precursory anomalies from the precursor of intricate water bloom in the context of a given area. In this paper, a water bloom precursor analysis method, based on two direction singular rough set, was proposed. This approach was produced on the basis of the different sections and pre-water bloom of water bloom precursor anomalies and characteristic of elements transferred in singular rough set. For testing the validity of two direction singular rough set application in water bloom precursor analysis, Xiangxi River, which is one of the typical tributaries of Three Gorges Reservoir in China, was selected as study area. The result showed that compared with other indexes, pH and dissolved oxygen (DO) are the most valuable indicators of water bloom in the precursory anomalies. Furthermore, regarding with water bloom precursory anomalies in Xiangxi River, most of the nutrient loading and biological community are the key indicators. Hence, this method can determine the main precursory anomaly for water bloom in the study area, which provides powerful knowledge support to water quality specialists for them to comprehensively analyze precursory anomaly so as to find out its relationship with occurrence law of water bloom.     

分离有机水溶液的聚离子复合膜（Ⅱ）

本文研究用聚离子昨合膜进行渗透汽化分离乙醇水溶液的特性，探讨了进料温度、浓度、膜后压力，进料液循环量等操作条件对膜分离性能的影响。     

大气回转反吹风袋收尘器在水泥库顶的应用

我公司现有水泥生产能力100万t,现有水泥库12个,水泥输送采用单仓泵气力输送,库顶收尘采用Z×75-42机械扁带除尘袋式收尘器,多年来水泥生产能力增加,收尘器未增加,加之该收尘器结构     

1，1＇－二（1，3－二氧代长链烷基）二茂铁的合成与表征

用１，１＇－二乙酰基二茂铁与酯的Ｃｌａｉｓｅｎ缩合反应合成了５个新的１，１＇－二（１，３－二氧代长链烷基）二茂铁，其通式为Ｃ５Ｈ４ＦｅＣ５Ｈ４（ＣＯＣＨ２ＣＯＣｎＨ２ｎ＋１）２，ｎ＝５～９。通过元素分析、紫外－可见光谱、红外光谱、核磁共振氢谱和质谱对这些化合物进行了表征。结果表明，这些β－二酮仅以烯醇式存在。     

Graft copolymerization of styrene and acrylonitrile onto EPDM

Acrylonitrile–EPDM–styrene (AES) graft copolymers were synthesized by solution graft polymerization of styrene (St) and acrylonitrile (AN) onto EPDM in an n‐hexane/benzene solvent with benzoyl peroxide (BPO) as an initiator. The structure changes were studied by an FTIR spectrophotometer. The grafting parameters were calculated gravimetrically. The influence of the polymerization conditions, such as the reaction time, concentration of the initiator, EPDM content, and weight ratio of St/AN, on the structure of the products was investigated. It was found that a proper initiator concentration and EPDM content will give a high grafting ratio of the AES resin. The thermal property of the copolymer was studied using programmed thermogravimetric analysis (TGA). The results showed that the copolymer has a better heat‐resistant property than that of ABS, especially for the initial decomposition temperature (T_in) and the maximum weight loss rate temperature (T_max). Also, the mechanism of the graft reaction was discussed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 428–432, 2002     

Effects of the electrospray ionization parameters on the formation and morphology of colloidal microspheres of polyacrylonitrile

Polyacrylonitrile colloidal microspheres have been successfully prepared with different concentrations of electrospraying polyacrylonitrile solutions. The morphology of the colloidal spheres has two kinds of structures and is strongly affected by electrospray‐ionization parameters, such as the polymer concentration, applied voltage, and distance between the electrodes. The solvent can also affect the morphology of polyacrylonitrile. The optimum conditions for preparing colloidal spheres have been found, and differential scanning calorimetry results indicate that polyacrylonitrile colloid spheres are amorphous. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2889–2893, 2006     

絮凝沉淀,过滤处理合成苯乙烯污水

本文通过对合成苯乙烯污水水质考察，提出了利用污水中本身所含有的ＡｌＣｌ３作为絮凝剂，对该污水进行絮凝沉淀过滤工艺处理。试验结果表明，处理后污水ＣＯＤ、ＰＨ值１、悬浮物含量等各项指标均能达到新建污水处理装置的排放标准，此工艺个有投资少、运行简单、易操作管理、处理成本低等特点。     

Studies on syntheses and properties of novel CeO2/polyimide nanocomposite films from Ce(Phen)3 complex

A series of cerium dioxide (CeO₂)/polyimide (PI) nanocomposites were successfully prepared from Ce(Phen)₃ and polyamic acid (PAA) via the solution direct-dispersing method, followed by a step thermal imidization process. TGA and XPS studies showed that the cerium complex decomposed to form CeO₂ during the thermal imidization process at 300 °C. SEM observation showed that the formed CeO₂ as nanoparticles was well dispersed in polyimide matrix with a size of about 50-100 nm for samples with different contents of CeO₂. Thermal analysis indicated that the introduction of CeO₂ decreased the thermal stability of nanocomposite films due to the decomposition of Ce(Phen)₃ in the imidization process, while the glass transition temperature (T_g) increased obviously, especially nanocomposite films with high loading of CeO₂ exhibited a trend of disappearance of T_g. DMTA and static tensile measurements showed that the storage modulus of nanocomposite films increased, while the elongation at break decreased with increasing CeO₂ content.     

二苯并噻吩合成方法的改进

对文献报道的由联苯和硫在AlCl3催化下反应合成二苯并噻吩(DBT方法中的提纯过程作了改进，大大简化了提纯步骤，使制备DBT的时间缩短了一半，产率为63．4％，经提纯后的成品含量达99．7％，其纯度、外观、晶相均优于进口试剂，但成本远低于进口试剂。产品用FT-IR、LRS、XRD和^1H NMR表征结果与文献报道完全相符合。