论文分析了交通规划类科研和实验教学的实际特点,考虑现有科研项目数据的类型、科研项目分散式管理需求以及开放式实验教学的发展趋势,基于动态服务器页面ASP(Active Server Pages)和结构化查询语言SQL(Structured Query Language)网络...论文分析了交通规划类科研和实验教学的实际特点,考虑现有科研项目数据的类型、科研项目分散式管理需求以及开放式实验教学的发展趋势,基于动态服务器页面ASP(Active Server Pages)和结构化查询语言SQL(Structured Query Language)网络技术,采用三层网络结构模型,设计并开发了为科研项目管理和实验教学服务的支持多用户、多进程的道路交通规划项目信息管理平台。展开更多
结合科研和教学实际,根据现有项目分散管理的特点、项目数据的格式以及办公系统的现状和管理的要求,基于动态服务器页面ASP(active server pages)和结构化查询语言SQL(structured query language)网络技术,采用三层网络结构模型,开发、...结合科研和教学实际,根据现有项目分散管理的特点、项目数据的格式以及办公系统的现状和管理的要求,基于动态服务器页面ASP(active server pages)和结构化查询语言SQL(structured query language)网络技术,采用三层网络结构模型,开发、实现了支持多用户、多进程的道路交通规划项目信息管理平台。展开更多
The synthesis of pyridine from aldehydes and ammonia was performed over ZSM-5 catalyst. The catalytic activity in reaction was correlated with the acidity of the zeolite catalysts. A few of ZSM-5 (m(SiO2)/m(Al2O3)=120...The synthesis of pyridine from aldehydes and ammonia was performed over ZSM-5 catalyst. The catalytic activity in reaction was correlated with the acidity of the zeolite catalysts. A few of ZSM-5 (m(SiO2)/m(Al2O3)=120) were prepared and modified with Co2+, Fe3+. The surface acidity was determined by Py-IR technique. It was found that CoZSM-5 and FeZSM-5 have fewer Lewis acid sites than HZSM-5. The decrease of Lewis acid sites leads to decreasing the ability of NH3 adsorption, this phenomenon insures that there are adequate acid sites discovering and reacting with aldehydes. It is advantageous to the reaction. By using a CoZSM-5 catalyst, the yields of pyridine base can reach 78%. The study provides a theoretical base for preparing high activity and high selective catalyst for pyridine synthesis.展开更多
文摘论文分析了交通规划类科研和实验教学的实际特点,考虑现有科研项目数据的类型、科研项目分散式管理需求以及开放式实验教学的发展趋势,基于动态服务器页面ASP(Active Server Pages)和结构化查询语言SQL(Structured Query Language)网络技术,采用三层网络结构模型,设计并开发了为科研项目管理和实验教学服务的支持多用户、多进程的道路交通规划项目信息管理平台。
文摘结合科研和教学实际,根据现有项目分散管理的特点、项目数据的格式以及办公系统的现状和管理的要求,基于动态服务器页面ASP(active server pages)和结构化查询语言SQL(structured query language)网络技术,采用三层网络结构模型,开发、实现了支持多用户、多进程的道路交通规划项目信息管理平台。
文摘The synthesis of pyridine from aldehydes and ammonia was performed over ZSM-5 catalyst. The catalytic activity in reaction was correlated with the acidity of the zeolite catalysts. A few of ZSM-5 (m(SiO2)/m(Al2O3)=120) were prepared and modified with Co2+, Fe3+. The surface acidity was determined by Py-IR technique. It was found that CoZSM-5 and FeZSM-5 have fewer Lewis acid sites than HZSM-5. The decrease of Lewis acid sites leads to decreasing the ability of NH3 adsorption, this phenomenon insures that there are adequate acid sites discovering and reacting with aldehydes. It is advantageous to the reaction. By using a CoZSM-5 catalyst, the yields of pyridine base can reach 78%. The study provides a theoretical base for preparing high activity and high selective catalyst for pyridine synthesis.
