IEC-60870-5-104规约作为采用标准传输协议子集的IEC60870-5-101的网络访问,由于涉及到网络编程以及颁布时间较晚,在电力系统中还处于推广阶段。目前对104规约的探讨不论是应用还是研究都比较深入,并且取得了一定的成绩,但在软件设计方...IEC-60870-5-104规约作为采用标准传输协议子集的IEC60870-5-101的网络访问,由于涉及到网络编程以及颁布时间较晚,在电力系统中还处于推广阶段。目前对104规约的探讨不论是应用还是研究都比较深入,并且取得了一定的成绩,但在软件设计方面,还没有形成较统一的开发模式,迫切需要一个好的设计方法和工具帮助开发者设计开发通信软件。基于有限状态机理论提出一种设计方法用于104规约的实现。在这种设计方法中,结合通信协议的分层思想进行软件的总体设计,同时应用有限状态机(Finite State Machine,FSM)理论对104规约建模,抽象出有限状态机模型,并提出一种面向对象的FSM实现框架及其配置工具,利用配置工具自动实现FSM。展开更多
The first theoretical study on the mechanism of [RhCl（CO）2]2-catalyzed [5 ＋ 1] cycloadditions of 3- acyloxy-1,4-enyne （ACE） and CO has been performed using density functional theory （DFT） calculations. The effe...The first theoretical study on the mechanism of [RhCl（CO）2]2-catalyzed [5 ＋ 1] cycloadditions of 3- acyloxy-1,4-enyne （ACE） and CO has been performed using density functional theory （DFT） calculations. The effect of ester on reactivity of this reaction has been investigated. The computational results have revealed that the preferred catalytic cycle involves the sequential steps of 1,2-acyloxy migration, CO insertion, reductive elimination to form ketene intermediate, 6π-electroncyclization, and aromatization to afford the resorcinol product. The 1,2-acyloxy migration is found to be the rate-determining step of the catalytic cycle. The electron-rich p-dimethylaminobenzoate substrate promotes 1,2-acyloxy migration and significantly increases the reactivity by stabilizing the positive charge building up in the oxocyclic transition state.展开更多
文摘IEC-60870-5-104规约作为采用标准传输协议子集的IEC60870-5-101的网络访问,由于涉及到网络编程以及颁布时间较晚,在电力系统中还处于推广阶段。目前对104规约的探讨不论是应用还是研究都比较深入,并且取得了一定的成绩,但在软件设计方面,还没有形成较统一的开发模式,迫切需要一个好的设计方法和工具帮助开发者设计开发通信软件。基于有限状态机理论提出一种设计方法用于104规约的实现。在这种设计方法中,结合通信协议的分层思想进行软件的总体设计,同时应用有限状态机(Finite State Machine,FSM)理论对104规约建模,抽象出有限状态机模型,并提出一种面向对象的FSM实现框架及其配置工具,利用配置工具自动实现FSM。
基金Tianjin Natural Science Foundation (No.14JCYBJC20100 X.X.)MOE Innovation Teams (Nos.IRT-13R30 and IRT13022) of ChinaNIH (No.R01GM088285 W.T.) for financial support
文摘The first theoretical study on the mechanism of [RhCl（CO）2]2-catalyzed [5 ＋ 1] cycloadditions of 3- acyloxy-1,4-enyne （ACE） and CO has been performed using density functional theory （DFT） calculations. The effect of ester on reactivity of this reaction has been investigated. The computational results have revealed that the preferred catalytic cycle involves the sequential steps of 1,2-acyloxy migration, CO insertion, reductive elimination to form ketene intermediate, 6π-electroncyclization, and aromatization to afford the resorcinol product. The 1,2-acyloxy migration is found to be the rate-determining step of the catalytic cycle. The electron-rich p-dimethylaminobenzoate substrate promotes 1,2-acyloxy migration and significantly increases the reactivity by stabilizing the positive charge building up in the oxocyclic transition state.
