Thermokinetics of Liquid-Liquid Reaction of Dy（NO3 ）3 with Histidine

The thermokinetics of liquid-liquid reaction of dysprosium nitrate with histidine were studied using a microcalorimeter. On the basis of experimental and calculated results, threethermodynamic parameters (the activation enthalpy, the activation entropy and the activation free enegy),the rate constant, three kinetic parameters (the activation energy, the pre-exponential constant and the reaction order) wereobtained. On the basis of thermodynamics and kinetics, the for marion reaction of the complex was discussed.     

英力士淤浆工艺聚乙烯装置低压系统凝胶原因分析及对策

在英力士淤浆环管工艺生产钛系双峰聚乙烯产品期间,低压溶剂回收系统产生黄色凝胶物质,极难清理且影响装置的长周期生产。通过与国内同类装置工艺运行条件比对、样品元素分析,改变了生产期间催化剂配置流程,调整了低压溶剂回收温度,进而消除了凝胶产生。     

半球谐振陀螺的漂移机理及其控制

基于半球谐振陀螺的结构特点及制造工艺技术限制等因素,研究了半球谐振陀螺的漂移机理。文中重点介绍了正交漂移及其控制,推导出正交漂移分量的数学模型。针对正交漂移产生的漂移速率和漂移角,给出了补偿和控制漂移的正交控制法。     

使用不同催化剂转产过程中淤浆法HDPE脱气仓结块原因分析

在英力士淤浆环管工艺高密度聚乙烯(HDPE)装置上,由采用钛系催化剂生产PE100级管材专用HDPE转换成用铬系催化剂生产的过程中,使用钛系催化剂的停车期间以及使用铬系催化剂的开车期间,粉料输送至低压闪蒸脱气仓都会产生块状的聚乙烯,严重影响装置的正常运行;通过对块状聚乙烯进行密度与凝胶渗透色谱分析,发现结块的聚乙烯主要为低相对分子质量、低密度的聚乙烯粉料黏结物。停车期间,将第一反应器氢气进料量降低50%,提前终止1-己烯进料,从而完全消除结块的形成。     

日光节能温室荷兰豆高效栽培技术

荷兰豆是一种目前比较流行的时尚菜肴,它具有丰富的维生素、氨基酸和矿物质营养。通过对它的研究,简要说明荷兰豆的栽培技术与病虫害的防治办法。     

小型风光互补高频逆变器的设计方法

在世界环境污染日趋严重的情况下,清洁能源作为一种无污染的能源已经引起人们的注意.设计了一种风光互补逆变器,从它的特性和原理入手,用Matlab/Simulink作了仿真.该设计具有原理简单以及成本少的优点.     

工业平缝机挑线机构的优化综合

本文采用最优化方法，对工业缝纫机的连杆挑线机构进行了优化综合。分析结果表明，新机构的大多数参数均有所改善，结构更趋紧凑，振动得以减缓，实用性能明显改善。     

RE（NO3）3与Glu间配合行为的相平衡研究

测定了ＲＥ（ＮＯ３）３－Ｇｌｕ－Ｈ２Ｏ（ＲＥ＝Ｌａ、Ｇｄ、Ｅｒ）三元体系在２５℃时的溶解度和饱和溶液的折光率，绘制了相应的溶解度图与他和溶液的折光率曲线。各体系的溶解度曲线与折光率曲线均由两支组成，分别与ＲＥ（ＮＯ３）３·ｎＨ２Ｏ（ＲＥ＝Ｌａ、Ｇｏｌ、ｎ＝６；ＲＥ＝Ｅｒ，ｎ＝５）和Ｇｌｕ相对应。实验结果表明，在这些体系中不存在ＲＥ（ＮＯ３）３与Ｇｌｕ的配合物。     

Measurements of Enthalpy Change of Reaction of Formation, Molar Heat Capacity and Constant-Volume Combustion Energy of Solid Complex Yb（Et2dtc）3（phen）

A ternary solid complex Yb(Et2dtc)3(phen) was obtained from the reaction of hydrous ytterbium chloride with sodium diethyldithiocarbamate (NaEt2dtc), and 1, 10-phenanthroline (o-phen·H2O) in absolute ethanol.The bonding characteristics of the complex were characterized by IR.The result shows Yb3 bands with two sulfur atoms in the Na(Et2dtc)3 and two nitrogen atoms in the o-phen.The enthalpy change of liquid-phase reaction of formation of the complex ΔrHθm (l), was determined as being (-24.838±0.114) kJ·mol-1 at 298.15 K, by an RD-496 Ⅲ type heat conduction microcalormeter.The enthalpy change of the solid-phase reaction of formation of the complex ΔrHθm (s), was calculated as being (108.015±0.479) kJ·mol-1 on the basis of an appropriate thermochemistry cycle.The thermodynamics of liquid-phase reaction of formation of the complex was investigated by changing the temperature during the liquid-phase reaction.Fundamental parameters, the activation enthalpy, ΔHθ≠, the activation entropy, ΔSθ≠, the activation free energy, ΔGθ≠, the apparent reaction rate constant k, the apparent activation energy E, the pre-exponential constant A, and the reaction order n, were obtained by a combination of the reaction thermodynamic and kinetic equations with the data from the thermokinetic experiments.At the same time, the molar heat capacity of the complex cm, p, was determined to be (86.34±1.74) J·mol-1·K-1 by the same microcalormeter.The constant-volume combustion energy of the complex, ΔcU, was determined to be (-17954.08±8.11) kJ·mol-1 by an RBC-Ⅱ type rotating-bomb calorimeter at 298.15 K.Its standard enthalpy of combustion, ΔcHθm, and standard enthalpy of formation, ΔfHθm, were calculated to be (-17973.29±8.11) kJ·mol-1 and (-770.36±9.02) kJ·mol-1, respectively.     

Thermochemical Properties of Solid Complexes of Rare Earth Nitrates with Methionine

ＴｈｅｒｍｏｃｈｅｍｉｃａｌＰｒｏｐｅｒｔｉｅｓｏｆＳｏｌｉｄＣｏｍｐｌｅｘｅｓｏｆＲａｒｅＥａｒｔｈＮｉｔｒａｔｅｓｗｉｔｈＭｅｔｈｉｏｎｉｎｅＧａｏＳｈｅｎｇｌｉ（高胜利），ＹａｎｇＸｕｗｕ（杨旭武），ＲｅｎＤｅｈｏｕ（任德厚）ＳｈｉＱｉｚ...