Synthesis and Spectral Properties of Mixed-Ligand Complexes of Lanthanide Perchlorate with Bis-(phenylsulfinyl)ethane and Organic Lewis Bases

ＳｙｎｔｈｅｓｉｓａｎｄＳｐｅｃｔｒａｌＰｒｏｐｅｒｔｉｅｓｏｆＭｉｘｅｄＬｉｇａｎｄＣｏｍｐｌｅｘｅｓｏｆＬａｎｔｈａｎｉｄｅＰｅｒｃｈｌｏｒａｔｅｗｉｔｈＢｉｓ（ｐｈｅｎｙｌｓｕｌｆｉｎｙｌ）ｅｔｈａｎｅａｎｄＯｒｇａｎｉｃＬｅｗｉｓＢａｓｅ...     

甲基磺酸镧催化缩醛化反应性能的研究

以正辛醛和乙二醇为原料,甲基磺酸镧为催化剂,合成了正辛醛缩乙二醇。采用正交实验法考察了影响收率的因素。其最优条件为,正辛醛∶乙二醇∶催化剂∶带水剂为1m o l∶1.2m o l∶7.5g∶75mL,反应在回流温度下进行,反应时间3.0h,收率可达87.2%。用此方法合成了其它三种缩醛,同样获得满意结果。证明甲基磺酸镧对缩醛化反应具有较高的催化活性。     

天然气制液态烃新工艺

丰富的天然气资源,特别是边远地区分散的中小天然气田和油气共生的油气田的天然气,由于产量达不到管线长输的规模效益,又远离消费市场,很难开发利用.为此,作者在天然气两段催化氧化制合成气和费-托合成研究的基础上,提出了一种流程较短、投资和操作费用较低的天然气合成液态烃新工艺,可将丰富的天然气资源,特别适合将边远地区分散的中小天然气田的天然气转化为无硫、无氮、无芳烃、无重金属污染和便于输运的优质石蜡基液态产品.该产品可经轻度加氢改质得到高品质的柴油掺合组分、润滑油基础油高等附加值产品.该工艺副产的燃料气可用于发电,或作为燃料气使用.     

高层建筑损伤识别中的补偿算法

本文在已有研究工作的基础上，提出了处理激励测量信息不完备情况下的补偿算法。此方法主要针对高层建筑动力检测中强迫激励的情况，是一种基于时域的识别方法，该方法实际上是利用客观工程实际中结构系统激励所具有的物理持征作为识别计算的辅助条件，来解决测量信息的不完备性问题。算例分析表明了该方法的可行性。     

IC—V100电台锁相环频率合成器

本文从频率合成器的结构、功能入手,详细阐述了频率编程的原理及方法。     

丙烯酸高碳醇酯的合成

介绍了降凝剂中间体丙烯酸高碳醇酯的合成和产品分离提纯方法。考察了合成条件对酯化反应的影响，结果表明，在原料丙烯酸与十八醇摩尔比1．2：1，阻聚剂对苯二酚用量占原料总量1．5％，催化剂对甲苯磺酸用量占原料总量1．5％，反应温度80-86℃，回流反应时间6h条件下，酯化率最高达89％。产品分离提纯方法与传统分离方法比较，所需分离时间短，洗涤用水量少，而产品收率远高于传统分离方法，达95％以上。     

环氧乙烷合成乙二醇的研究进展

介绍了环氧乙烷合成乙二醇的主要生产方法，包括以壳牌、联碳化学公司以及Halcon—SD公司为代表的环氧乙烷直接水合法，环氧乙烷催化水合法和碳酸乙烯酯法，后两种乙二醇生产方法是目前国内外研究开发的热点。催化剂体系是催化水合法工艺的关键，重点介绍了国内外各主要公司对催化剂体系的研究进展及使用效果；碳酸乙烯酯法分为乙二醇和碳酸二甲酯联产法以及碳酸乙烯酯水解法，详细介绍了国内外各主要公司对该技术的研究进展，包括工艺流程、催化剂体系等方面。将3种乙二醇生产方法进行技术经济比较，结果表明，催化水合法和碳酸乙烯酯法在原料消耗和能耗方面占优势。并对我国乙二醇生产工艺技术提出建议。     

INCORPORATING PRACTICAL AND SYNTHESIS CONTENTS IN UNDERGRADUATE CONTROL EDUCATION

This paper revisits the effort over the last decade in making undergraduate control education more useful and attractive to both the control engineers and the engineers at large. With the help of further coverage in new textbooks, more practical and synthesis contents in the control courses have been incorporated. Gaps still exist, particularly in the areas of PID control and auto‐tuning, fuzzy control, overall control strategy, control structure and systems thinking, and these will be elaborated. A major challenge is in the coverage of more practical and synthesis contents in the introductory common control course for all engineers. How this may be resolved is discussed. Finally, the need for new teaching approaches such as the use of interesting case studies and the use of problem‐based learning will be outlined.     

Studies on the structural and ionic transport properties at elevated temperatures of La1−xMnO3±δ synthesized by a wet chemical method

Structural transformation and ionic transport properties are investigated on wet-chemically synthesized La_1−xMnO₃ (x=0.0–0.18) compositions. Powders annealed in oxygen/air at 1000–1080 K exhibit cubic symmetry and transform to rhombohedral on annealing at 1173–1573 K in air/oxygen. Annealing above 1773 K in air or in argon/helium at 1473 K stabilized distorted rhombohedral or orthorhombic symmetry. Structural transformations are confirmed from XRD and TEM studies. The total conductivity of sintered disks, measured by four-probe technique, ranges from 5 S cm⁻¹ at 298 K to 105 S cm⁻¹ at 1273 K. The ionic conductivity measured by blocking electrode technique ranges from 1.0×10⁻⁶ S cm⁻¹ at 700 K to 2.0×10⁻³ S cm⁻¹ at 1273 K. The ionic transference number of these compositions ranges from 3.0×10⁻⁵ to 5.0×10⁻⁵ at 1273 K. The activation energy deduced from experimental data for ionic conduction and ionic migration is 1.03–1.10 and 0.80–1.00 eV, respectively. The activation energy of formation, association and migration of vacancies ranges from 1.07 to 1.44 eV.