蒙脱石热处理产物的MASNMR研究

本文对广东和平蒙脱石及其热处理产物进行了化学分析、差热和热重分析、Ｘ射线粉末衍射分析、红外吸收光谱分析、原子力显微镜及魔角旋转核磁共振等研究。结果表明,蒙脱石在热处理温度为５００～７００℃时,其Ｓｉ、Ａｌ的ＭＡＳ ＮＭＲ谱表现为变蒙脱石的谱学特征。加热至６５９℃时,蒙脱石八面体片中的羟基开始脱失,但层状结构仍然保持,这种羟基的脱失过程对应着八面体片中Ａｌ（ＶＩ）向Ａｌ（ＩＶ）的转变。温度达到９００     

蒙脱石酸处理产物的微结构变化研究

本文对广东和平蒙脱石及其酸处理产物进行了化学分析、Ｘ线射线粉末衍射分析、红外吸收光谱分析、电子顺磁共振谱、原子力显微镜及魔角旋转核磁共振等研究,结果表明,酸处理浓度对蒙脱石的表面结构有很大的影响,当酸处理浓度达到２０％时,蒙脱石的Ｑ＾３Ｓｉ结构有部分转变为畸变的Ｑ＾３Ｓｉ结构和Ｑ＾４Ｓｉ结构,而Ａｌ的结构状态则没有发生任何变化,这与原子力显微镜的观察结果相一致。     

A technique for simultaneous in situ MAS NMR and on-line gas chromatographic studies of hydrocarbon conversions on solid catalysts under flow conditions

A new technique is introduced allowing simultaneous in situ MAS NMR investigations of hydrocarbon conversions on solids under flow conditions and on-line gas chromatography. For adsorption of methanol on zeolite HBeta, equal amounts of adsorbed molecules were determined by both analytical methods. Studying the synthesis of methyl tertiary-butyl ether (MTBE) on zeolite HBeta using an MAS NMR rotor reactor, a constant yield of MTBE of Y_mtbe= 27% was obtained up to a weight hourly space velocity of 1.4 h^-1. The variation of the reaction temperature led to a simultaneous change of the ¹³C MAS NMR signals of isobutoxy species and of the yield of MTBE determined by on-line gas chromatography which indicates that isobutoxy species act as chemically active compounds. In this first application, the new in situ technique has demonstrated its advantage for a simultaneous investigation of compounds with a long residence time on the catalyst surface and of compounds rapidly leaving the catalyst surface. This revised version was published online in July 2006 with corrections to the Cover Date.     

Mid‐node admissible spaces for quadratic triangular 2D finite elements with one edge curved

A robust element distortion metric, based on the new concept of mid‐node admissible spaces, for two‐dimensional quadratic triangular finite elements is developed. The metric is based on the Jacobian determinant over the entire element, without requiring that it actually be computed everywhere on the element. The metric is relatively inexpensive to compute, especially for mildly distoted elements. The metric is able to detect elementsof poor quality that other distortion metrics fall to detect. It also has the ability to approve elements of good quality regardless of the extent to which they may appear geometrically distorted. Copyright © 2001 John Wiley & Sons, Ltd.     

Gene Mapping,Cloning and Association Analysis for Salt Tolerance in Rice

Soil salinization caused by the accumulation of sodium can decrease rice yield and quality. Identification of rice salt tolerance genes and their molecular mechanisms could help breeders genetically improve salt tolerance. We studied QTL mapping of populations for rice salt tolerance, period and method of salt tolerance identification, salt tolerance evaluation parameters, identification of salt tolerance QTLs, and fine-mapping and map cloning of salt tolerance QTLs. We discuss our findings as they relate to other genetic studies of salt tolerance association.     

添加了线状MA/AA/MAS聚羧酸分散剂陶瓷坯体料浆流变模型的确立

采用流变仪测定添加了线状MA/AA/MAS聚羧酸分散剂陶瓷坯体料浆的流变特性,用Power-law、Binghamplastic、Herschel-Bulkley、Casson和Sisko等五种模型方程对添加了线状MA/AA/MAS聚羧酸分散剂陶瓷坯体料浆的流变曲线进行拟合,结果发现Herschel-Bulkley模型是一种最适合研究添加了线状MA/AA/MAS聚羧酸分散剂陶瓷坯体料浆流变性和触变性的流变模型.     

基于多Agent的电力市场技术支持系统研究

将多Agent技术引入电力市场技术支持系统设计中,提出了基于多Agent的广义电力市场技术支持系统模型和电力市场技术支持系统的设计方案。该方案将电力市场技术支持系统设计为由用户Agent、通信Agent、数据管理Agent、协调Agent和多个应用Agent构成的多Agent系统。对Agent的功能和结构进行了设计,并讨论了多Agent系统开发的关键技术。     

含储能装置的直流微电网控制系统研究

分析了基于Multi Agent系统（MAS）技术的控制系统。提出了一个典型的直流微电网系统和基于逆系统方法的定交流电压控制策略,建立了PSCAD/EMTDC模型。仿真结果表明,在风速波动情况下,该系统能够保证有功的平衡和直流电压的稳定,且能有效地维持交流母线电压和频率的恒定,即使在孤岛运行时,也能保证对用户的可靠供电。     

基于RS485总线的组合开关保护测控系统

提出一种基于RS485总线、具有多代理结构（MAS）的新型组合开关保护测控系统,实际运行表明该组合开关保护测控系统可靠性高、实时性好,可实现组合开关的任意组合。