辽化裂解装置技术改造

辽阳石化烯烃厂裂解装置于2001年检修期间，完全采用国内技术，完成了120kt/a乙烯装置扩能改造工作，介绍了装置改造的主要内容和特点，生产运行和考核情况，以及扩能改造存在的问题和解决措施。     

High temperature polymerization of propylene catalyzed by MgCl2‐supported Ziegler–Natta catalyst with various cocatalysts

Four cocatalysts, referred to as ethylaluminoxanes, were synthesized by the reaction between triethylaluminium (AIEt₃) and water under various molar ratios of H₂O/Al at ?78°C. Aluminoxanes were used as cocatalysts for a MgCl₂‐supported Ziegler–Natta catalyst for propylene polymerization at temperatures ranging from 70 to 100°C. When the polymerization was activated by AlEt₃, the activity as well as the molecular weight and isotacticity of the resulting polymer gradually dropped as the temperature varied from 70 to 100°C. When ethylaluminoxane was employed as the cocatalyst, good activity and high molecular weight and isotacticity were obtained at 100°C. Furthermore, when the cocatalyst varied from AlEt₃ to ethylaluminoxane, the atactic fraction and polymer fraction with moderate isotacticity decreased and the high isotactic fraction slightly increased, which indicated that the variation of the cocatalyst significantly affects the isospecificity of active sites. It was suggested that the reactivity of the Al‐Et group and the size of the cocatalyst were correlated to the performance of the Ziegler–Natta catalyst at different temperatures. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1978–1982, 2006     

加压下二氧化碳在二甲基甲酰胺中的溶解度研究

本文报道了二氧化碳在二甲基甲酰胺中的溶解度,实验温度分别为15、20、25、30、35、40、45℃,实验压力为207.21—1684.02kPa.并且提出一个考虑了过量熵的、用溶度参数表示的活度系数方程.     

探讨概率应用的几个典型问题

概率应用遍及自然科学和社会生活之中,科学的概率不仅应当服务于科学,更重要的是能够服务于概率应用。这里通过解决典型问题,剖析概率研究方法的特殊性,探讨概率应用的一般方法。     

浅谈电子产品对儿童的影响及对策

在现代社会中,平板电脑、智能手机在人们日常生活的方方面面发挥着巨大的作用。通过分析电子产品在儿童和青少年的视力、身体发育、社交能力和学习能力等方面的负面影响,提出了加强亲子陪伴、合理引导控制等应对措施。     

电子陶瓷和器件的低温共烧技术

较系统地介绍了电子器件用低温共烧陶瓷(low temperature cofired ceramics,LTCCs)材料,探讨了其工艺中的若干问题。电子器件用低温共烧陶瓷材料包括:玻璃/陶瓷复合材料、结晶化玻璃、晶化玻璃/陶瓷复合材料以及液相烧结陶瓷,其中典型的和最为常用的LTCCs为玻璃/陶瓷(特别是氧化铝)复合材料。正在研究的一些陶瓷介质材料中,Bi基介质材料引起了人们的关注。玻璃/陶瓷复合材料的制备工艺中,应当着重关注和加深了解玻璃的流动性和结晶性、玻璃的起泡、玻璃和陶瓷颗粒间的反应、共烧材料的匹配等问题,从优选材料配方和优化工艺着手,从而获得优质可靠的材质和器件。     

Study of different effect on foaming process of biodegradable bionolle in supercritical carbon dioxide

Microcellular foaming of biodegradable Bionolle in supercritical CO₂ has been produced. The effects of a series of variable factors, such as saturation temperature, saturation pressure, and depressurization time and step on the foam structures and density, were studied through measurement of density and SEM observation. The experimental results show that higher saturation temperatures lead to an increase in bulk densities; and different depressurization time and step result in different product cell morphology. In addition, at some saturation temperature, the orientation of the cells can be found in the product morphology. XRD experimental results show that the foaming treatment with SC CO₂ increased the crystallinity of Bionolle. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2901–2906, 2006     

Solid state interfacial reactions in electrodeposited Ni/Sn couples

Ni/Sn couples,prepared by sequentially electroplating Ni layers and Sn layers on metallized Si wafers,were employed to study the mierostructures and growth kinetics of Ni-Sn intermediate phases,when the Ni/Sn couples were aged at room temperature or annealed at temperatures from 150 to 225℃for various times.The results show that the NiSn phase and Ni_3Sn_4 phase are formed,respectively,in the aged couples and annealed couples.The Ni_3Sn_4 layer is continuously distributed between the Ni and Sn sides in t...     

一锅法催化合成N-苄基-4-甲基苯胺

以Raney-Ni为催化剂,对甲基硝基苯和苯甲醛为原料一锅法催化合成了N-苄基-4-甲基苯胺.考察了氢压、反应温度、反应时间、催化剂用量及物料配比等对N-苄基-4-甲基苯胺合成的影响,探讨了一锅法催化合成了N-苄基-4-甲基苯胺的反应机理.实验结果表明,以对甲基硝基苯和苯甲醛为原料一锅法催化合成N-苄基-4-甲基苯胺的反应过程是分二步进行的.优化的合成N-苄基-4-甲基苯胺工艺条件为:苯甲醛与对甲基硝基苯的摩尔比为1:1.0～1:1.02;Raney-Ni催化剂用量为5%(以对甲基硝基苯用量计);氢压为1.0 Mpa;反应温度为353 K;反应时间为90 min.在此所选择的条件下,N-苄基-4-甲基苯胺的收率达99.1%～99.7%.     

3种花卉在山区及平原越夏的效果评价

通过对金宝剑（Vrieseamarjolcin）、安祖花（Anthuriumandraeanum）和一品红（Euphorbiapulcherrima）3种花卉在萧山区海拔500m山区越夏与海拔9m平原越夏的比较试验,结果显示：山区越夏后,金宝剑的叶片数、叶片长度、叶宽、株高和冠径分别比平原越夏后增长了6．9％,28．6％,7．1％,7．5％和9．7％,叶色较深,生长好又快;安祖花的植株高,花蕾多,叶片深绿、有光泽,其平均株高和单株花蕾数分别比平原越夏后高3．2cm和多0．8个;一品红的平均株高55．8cm,每株最大苞片平均7．8cm,且完全转红,达到市场销售的要求,而平原越夏后则出现下部叶片掉落的现象（平均株高57．1cm,每株最大苞片平均7．2cm）,不完全转红,不能形成成品,达不到市场销售的要求。表明这三种花卉在山区越夏的生长情况都要好于平原越夏。