In order to realize the coordination oriented management of the economy resource environment(Ec R Ev) composite system,its optimal aggregate coordinating measurement model is established.A self learning method is...In order to realize the coordination oriented management of the economy resource environment(Ec R Ev) composite system,its optimal aggregate coordinating measurement model is established.A self learning method is presented,which combines the optimizing technology and stability analysis together to achieve a tradeoff between the optimizing objective and system stability.So a model for chaos control of the composite system based on coordination is proposed.展开更多
阐述了发电厂厂用电监控系统ECS(Electric Control System)由简易到先进的3个发展阶段,即一对一的控制方式,电气监控纳入集散控制系统(DCS)的控制方式,全数字化的电气监控系统、并为DCS提供所需信息接口和控制接口的控制方式。分析表明...阐述了发电厂厂用电监控系统ECS(Electric Control System)由简易到先进的3个发展阶段,即一对一的控制方式,电气监控纳入集散控制系统(DCS)的控制方式,全数字化的电气监控系统、并为DCS提供所需信息接口和控制接口的控制方式。分析表明DCS和ECS控制层之间的通信介质采用基于TCP/IP的以太网,通信规约采用IEC-104或OPC(OLE for Process Control)是合适的。实例说明了在600 MW等大机组电厂的工程设计中,只要优化好ECS系统的组网方案、选择恰当的通信规约,就能满足DCS通过ECS系统对参与顺序控制的电气量进行软采集和控制的高速要求。展开更多
厂用电监控系统ECS(Electric Control System)纳入集散控制系统DCS(Distributed Control System)在2×300MW机组脱硫发电厂获得成功应用。通过分析表明,ECS组网方案的优化及通信规约的恰当选择,不仅完全满足DCS通过ECS对参与顺序控...厂用电监控系统ECS(Electric Control System)纳入集散控制系统DCS(Distributed Control System)在2×300MW机组脱硫发电厂获得成功应用。通过分析表明,ECS组网方案的优化及通信规约的恰当选择,不仅完全满足DCS通过ECS对参与顺序控制的电气量进行软采集和控制的要求,还能在建设中节约投资,在生产运行过程中减少运行及维护的工作量,提高电气设备的管理水平。展开更多
高炉煤气余压透平发电TRT-(Blast Furnace Top Gas Recovery Turbine Unit,以下简称TRT)是冶金行业中公认的节能手段。本文采用浙大中控WebField ECS-100 DCS控制系统实现攀钢新#3高炉TRT透平发电装置的控制。通过对DCS系统硬件、软件...高炉煤气余压透平发电TRT-(Blast Furnace Top Gas Recovery Turbine Unit,以下简称TRT)是冶金行业中公认的节能手段。本文采用浙大中控WebField ECS-100 DCS控制系统实现攀钢新#3高炉TRT透平发电装置的控制。通过对DCS系统硬件、软件的设计与调试,成功实现了TRT装置的并网运行,为企业创造了较大的经济效益、为TRT装置的控制积累了大量的经验。展开更多
Surgery following neoadjuvant chemoradiotherapy(NCRT) is a common multidisciplinary treatment for resectable esophageal cancer(EC). After analyzing 12 randomized controlled trials(RCTs), we discuss the key issues of s...Surgery following neoadjuvant chemoradiotherapy(NCRT) is a common multidisciplinary treatment for resectable esophageal cancer(EC). After analyzing 12 randomized controlled trials(RCTs), we discuss the key issues of surgery in the management of resectable EC. Along with chemoradiotherapy, NCRT is recommended for patients with squamous cell carcinoma(SCC) and adenocarcinoma(AC), and most chemotherapy regimens are based on cisplatin, fluorouracil(FU), or both(CF). However, taxane-based schedules or additional studies, together with newer chemotherapies, are warranted. In nine clinical trials, post-operative complications were similar without significant differences between two treatment groups. In-hospital mortality was significantly different in only 1 out of 10 trials. Half of the randomized trials that compare NCRT with surgery in EC demonstrate an increase in overall survival or disease-free survival. NCRT offers a great opportunity for margin negative resection, decreased disease stage, and improved loco-regional control. However, NCRT does not affect the quality of life when combined with esophagectomy. Future trials should focus on the identification of optimum regimens and selection of patients who are most likely to benefit from specific treatment options.展开更多
In order to improve the effect of the induction motor controller of the electric vehicle and meet the special requirements of the electric vehicle,an improved method-vector control method is put forward.By analyzing t...In order to improve the effect of the induction motor controller of the electric vehicle and meet the special requirements of the electric vehicle,an improved method-vector control method is put forward.By analyzing the traditional vector control method,a model of induction motor is established considering stator iron loss and rotor iron loss.This model contains physical model and mathematical model.Mathematical model is set up based on the special requirements of electric vehicles on the induction motor,that is,the induction motor must have a wide speed range and fast torque response.Then,through the extraction of the formula,the dynamic compensation proposal and static compensation proposal can be got.Ultimately,the simulation analysis testifies the effectiveness of the method.展开更多
基金Supported by National Natural Science Foundation of China(No.79970 0 4 3)
文摘In order to realize the coordination oriented management of the economy resource environment(Ec R Ev) composite system,its optimal aggregate coordinating measurement model is established.A self learning method is presented,which combines the optimizing technology and stability analysis together to achieve a tradeoff between the optimizing objective and system stability.So a model for chaos control of the composite system based on coordination is proposed.
文摘阐述了发电厂厂用电监控系统ECS(Electric Control System)由简易到先进的3个发展阶段,即一对一的控制方式,电气监控纳入集散控制系统(DCS)的控制方式,全数字化的电气监控系统、并为DCS提供所需信息接口和控制接口的控制方式。分析表明DCS和ECS控制层之间的通信介质采用基于TCP/IP的以太网,通信规约采用IEC-104或OPC(OLE for Process Control)是合适的。实例说明了在600 MW等大机组电厂的工程设计中,只要优化好ECS系统的组网方案、选择恰当的通信规约,就能满足DCS通过ECS系统对参与顺序控制的电气量进行软采集和控制的高速要求。
文摘厂用电监控系统ECS(Electric Control System)纳入集散控制系统DCS(Distributed Control System)在2×300MW机组脱硫发电厂获得成功应用。通过分析表明,ECS组网方案的优化及通信规约的恰当选择,不仅完全满足DCS通过ECS对参与顺序控制的电气量进行软采集和控制的要求,还能在建设中节约投资,在生产运行过程中减少运行及维护的工作量,提高电气设备的管理水平。
文摘高炉煤气余压透平发电TRT-(Blast Furnace Top Gas Recovery Turbine Unit,以下简称TRT)是冶金行业中公认的节能手段。本文采用浙大中控WebField ECS-100 DCS控制系统实现攀钢新#3高炉TRT透平发电装置的控制。通过对DCS系统硬件、软件的设计与调试,成功实现了TRT装置的并网运行,为企业创造了较大的经济效益、为TRT装置的控制积累了大量的经验。
文摘Surgery following neoadjuvant chemoradiotherapy(NCRT) is a common multidisciplinary treatment for resectable esophageal cancer(EC). After analyzing 12 randomized controlled trials(RCTs), we discuss the key issues of surgery in the management of resectable EC. Along with chemoradiotherapy, NCRT is recommended for patients with squamous cell carcinoma(SCC) and adenocarcinoma(AC), and most chemotherapy regimens are based on cisplatin, fluorouracil(FU), or both(CF). However, taxane-based schedules or additional studies, together with newer chemotherapies, are warranted. In nine clinical trials, post-operative complications were similar without significant differences between two treatment groups. In-hospital mortality was significantly different in only 1 out of 10 trials. Half of the randomized trials that compare NCRT with surgery in EC demonstrate an increase in overall survival or disease-free survival. NCRT offers a great opportunity for margin negative resection, decreased disease stage, and improved loco-regional control. However, NCRT does not affect the quality of life when combined with esophagectomy. Future trials should focus on the identification of optimum regimens and selection of patients who are most likely to benefit from specific treatment options.
文摘In order to improve the effect of the induction motor controller of the electric vehicle and meet the special requirements of the electric vehicle,an improved method-vector control method is put forward.By analyzing the traditional vector control method,a model of induction motor is established considering stator iron loss and rotor iron loss.This model contains physical model and mathematical model.Mathematical model is set up based on the special requirements of electric vehicles on the induction motor,that is,the induction motor must have a wide speed range and fast torque response.Then,through the extraction of the formula,the dynamic compensation proposal and static compensation proposal can be got.Ultimately,the simulation analysis testifies the effectiveness of the method.
