Ethylene Oligomerization and Polymerization： Alternative Iron Catalysts beyond 2,6-Bisiminopyridyl Iron Complexes

Polyolefin industry arrives the option to transfer from multiple-site systems of the classical Ziegler-Natta catalysts to more sophisticated single-site catalysts. The late-transition metal compounds were traditionally assumed with poor polymerization properties due to the highly competitive chain-termination step, and produced the short-chain oligomers up to 40 carbon atoms （SHOP catalysts）. Recently the polyolefins employing latetransition metal complexes as catalysts became a hot research subject with the pioneering works by Brookhart and Gibson. It is promising for nickel catalysts to use solely ethylene as monomer for highly branched polyethylenes, and the designed nickel catalysts were not useful in industry. It is critical time to investigate the relationship of coordination modes of nickel complexes and its catalytic activities and the properties of resultant polyethylenes.     

镍基催化剂上丙酮常压气相加氢

研究了常压下丙酮的氢反应的镍基催化剂，确定了可以获得较高异丙醇选择性的催化剂较为适宜的活化时间、活化温度和反应温度等工艺条件，对于丙酮／异丙醇化学热泵的实际工业应用具有指导意义。     

La2O3对Ni/α-Mg2Al4SiO5O18催化剂表面结构作用机理的计算机图像纹理解析

应用计算机图像纹理分析的理论与方法探讨了稀土氧化物 (La2 O3 )对Ni/α Mg2 Al4 SiO5O18催化剂表面结构的影响 .研究表明 ,空间灰度值共生矩阵 (SGLCM)法所抽取的纹理熵和纹理能特征是催化剂表面镍的分散状态和稳定性的有效度量 ,将所获得的信息与催化剂表面的镍晶粒度及活性相关联 ,均取得较好的一致性 ,说明计算机图像纹理分析是催化剂设计和结构分析的新途径 .     

New Explorations for Decision Trees

1. INTannVCTIONThere axe mny techulques to rePresat and soho a decision Problem, such as deci8ion trees, game trees, strategicforms, algebric aPproathes, chence diapams, sequentiaJ decision diagrams, edation bos [1~7]. AinongtheIn, a fundameniaJ and allo the most populaI mathOd is decision tree. All Other methods are the edensionsor genertheation of decision trees. Bat nearly all these te~s are used to the an OPthoal sohibo to adecision prob1em. Whn we rePMed and sOlve a decision pro…     

二烷基膦酸载体液膜中Zn(II)的传输研究

研究了以烷基膦酸 PC-88A为流动载体的液膜中 Zn( II)的迁移规律 ,并考察了料液相 p H、温度、载体浓度及解析相组成对 Zn( II)迁移过程的影响。结果表明 ,增加载体浓度或升高温度 ,Zn( II)迁移速率明显增大 ,料液相 p H在 2 .4～ 5.1时可获得较大的 Zn( II)迁移速率。确定了最佳传质条件 ,探讨了各种因素影响机理 ,实现了 Zn( II)与 Cd( II)的分离。     

Bioaccumulation of Au(Ⅲ) by cyanobacteria Anabaena azollae

The gold accumulation efficiency of culturing Anbaena azollae (a filamentous speciees of cyanobacteria in gold bearing medium is observed. It is indicated that it is possible to produce metal combined proteins by culturing metal tolerating cyanobacteria ain metal bearing solution.     

胶东一个新发现金矿床--辉寨金矿床成矿特征研究

研究了胶东地区新发现的辉寨金矿床,依据围岩蚀变分带特征,成矿热液组分、成矿温度、氢氧同位素、Rb-Sr等时线数据等,该矿床为产于黄铁绢英岩中的蚀变岩型金矿床,由此扩大了该区找金前景.