For a semi-submersible platform in repair, the eight old main brackets which connect columns with pontoons need to be replaced by new ones. In order to ensure the safety of the cutting operation of the old main bracke...For a semi-submersible platform in repair, the eight old main brackets which connect columns with pontoons need to be replaced by new ones. In order to ensure the safety of the cutting operation of the old main bracket and calculate the initial stress condition of new main bracket, the structural stress monitoring of eight key spots is carried out, and then the calibrated finite element model is established according to the field monitoring results. Before cutting the main bracket and all associated structures, eight rectangular rosettes were installed, and a tailored cutting scheme was proposed to release the initial stress, in which the main bracket and associated column and pontoon plates were partly cut. During the cutting procedure, the strains of the monitoring spots were measured, and then the structural stress of the monitored spots were obtained. The stress variation characteristics at different spots during the initial cutting operation were shown and the initial stress condition of the monitored spots was figured out. The loading and support conditions of the semi-submersible platform were calibrated based on the measured initial stress condition, which made the finite element model more credible. The stress condition with the main bracket and associated structures being entirely cut out is analyzed by the Finite Element Method (FEM), which demonstrates the cutting operation to be safe and feasible. In addition, the calibrated finite element model can be used to calculate the initial stress condition of the new main bracket, which will be very helpful for the long-term stress monitoring on the main bracket.展开更多
Objective:To analyze the prescription of Huang Lijuan in the treatment of chronic heart failure based on the TCM inheritance platform. Methods:Professor Huang Lijuan's outpatient medical treatment for chronic hear...Objective:To analyze the prescription of Huang Lijuan in the treatment of chronic heart failure based on the TCM inheritance platform. Methods:Professor Huang Lijuan's outpatient medical treatment for chronic heart failure was collected, and the medical record database was established by using the Chinese medicine inheritance auxiliary platform. Based on the software's integrated rule analysis, improved mutual information method, complex system entropy clustering analysis and other data mining methods, Professor Huang Lijuan summed up the treatment of chronic heart failure. Results:A total of 114 prescriptions for treating chronic cardiac insufficiency were prepared by Professor Huang Lijuan. A total of 108 Chinese herbal medicines were used. The frequency of use was the highest in jaundice, salvia, and medlar. The four gases of the drug are mainly temperate;the drug has the most sweet taste in the five flavors;the drug is followed by the liver, and the heart rate is the highest. There are 32 groups of commonly used drug combinations;48 groups of common horn drugs are combined, and the map shows the drug association degree network, 6 core groups, and 3 new sites. Conclusions:Professor Huang Lijuan is treating the chronic heart failure with the benefits of temperature and yang, promoting blood circulation and diuresis as the basic treatment, and also relies on diarrhea and lung water and replenishing heart and yin.展开更多
虚拟电厂(virtual power plant,VPP)可聚合多利益主体的分布式资源(distributed energy resources,DER)参与电力市场,以深入挖掘分布式能源的调度潜力,如何考虑各运行主体的协同调度,提高整体收益成为当前亟需解决的重要问题。基于此,...虚拟电厂(virtual power plant,VPP)可聚合多利益主体的分布式资源(distributed energy resources,DER)参与电力市场,以深入挖掘分布式能源的调度潜力,如何考虑各运行主体的协同调度,提高整体收益成为当前亟需解决的重要问题。基于此,提出了计及风光及市场电价不确定风险和多主体协同的虚拟电厂参与主辅市场联合优化策略。首先,建立电动汽车群体(electric vehicle duster,EVC)的可调度域评估模型,在此基础上考虑VPP与EVC两主体的利益均衡,提出VPP与EVC主从博弈的主能量市场日前竞标模型;其次,考虑电池储能系统(battery energy storage system,BESS)快速充放电的特性,进一步提出VPP参与主能量市场和辅助调频市场的日前联合投标模型和VPP实时调整及调频响应模型;最后,在日前联合投标模型中引入条件风险价值(condition value at risk,CVaR),衡量日前投标收益与不确定风险的关系。基于某省电力市场规则进行算例仿真表明,所提VPP优化策略能通过提供调频服务和鼓励EV响应调度提高VPP的综合收益。展开更多
Recently,natural draft dry cooling system with the main-auxiliary integrated air-cooled heat exchangers in the up and lower layers,has drawn attention to the electric power industry.This research firstly develops two ...Recently,natural draft dry cooling system with the main-auxiliary integrated air-cooled heat exchangers in the up and lower layers,has drawn attention to the electric power industry.This research firstly develops two physical models for the integrated cooling system,namely Case A and Case B.In Case A,the main air-cooled heat exchanger is arranged in the upper layer and the auxiliary air-cooled heat exchanger arranged in the lower layer,while in Case B,the two heat exchanger systems are arranged in the opposite way.And then,directing at the engineering TMCR and TRL 1 working conditions,the unit-local-overall thermo-flow characteristics of Case A and Case B are obtained and compared by numerical simulation.The findings show that,for the auxiliary air-cooled exchanger,Case A has obviously higher cooling performances than Case B,with the difference varying from 5.46%to 7.55%.Whereas,for the main air-cooled exchanger,Case B shows the recovered cooling performances,with the difference changing from 1.15%to 2.99%.Case A is preferably recommended to the engineering application in consideration of more strict cooling demand of the auxiliary cooling system.Conclusively,this research will provide some theoretical guidelines for the design and construction of the main-auxiliary integrated natural draft dry cooling system.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.51709170 and 51979167)the Ministry of Industry and Information Technology of China(Project No.[2016] 546)+1 种基金the Shanghai Sailing Program(Grant No.17YF1409700)the Open Foundation of State Key Laboratory of Ocean Engineering(Grant No.1716)
文摘For a semi-submersible platform in repair, the eight old main brackets which connect columns with pontoons need to be replaced by new ones. In order to ensure the safety of the cutting operation of the old main bracket and calculate the initial stress condition of new main bracket, the structural stress monitoring of eight key spots is carried out, and then the calibrated finite element model is established according to the field monitoring results. Before cutting the main bracket and all associated structures, eight rectangular rosettes were installed, and a tailored cutting scheme was proposed to release the initial stress, in which the main bracket and associated column and pontoon plates were partly cut. During the cutting procedure, the strains of the monitoring spots were measured, and then the structural stress of the monitored spots were obtained. The stress variation characteristics at different spots during the initial cutting operation were shown and the initial stress condition of the monitored spots was figured out. The loading and support conditions of the semi-submersible platform were calibrated based on the measured initial stress condition, which made the finite element model more credible. The stress condition with the main bracket and associated structures being entirely cut out is analyzed by the Finite Element Method (FEM), which demonstrates the cutting operation to be safe and feasible. In addition, the calibrated finite element model can be used to calculate the initial stress condition of the new main bracket, which will be very helpful for the long-term stress monitoring on the main bracket.
文摘Objective:To analyze the prescription of Huang Lijuan in the treatment of chronic heart failure based on the TCM inheritance platform. Methods:Professor Huang Lijuan's outpatient medical treatment for chronic heart failure was collected, and the medical record database was established by using the Chinese medicine inheritance auxiliary platform. Based on the software's integrated rule analysis, improved mutual information method, complex system entropy clustering analysis and other data mining methods, Professor Huang Lijuan summed up the treatment of chronic heart failure. Results:A total of 114 prescriptions for treating chronic cardiac insufficiency were prepared by Professor Huang Lijuan. A total of 108 Chinese herbal medicines were used. The frequency of use was the highest in jaundice, salvia, and medlar. The four gases of the drug are mainly temperate;the drug has the most sweet taste in the five flavors;the drug is followed by the liver, and the heart rate is the highest. There are 32 groups of commonly used drug combinations;48 groups of common horn drugs are combined, and the map shows the drug association degree network, 6 core groups, and 3 new sites. Conclusions:Professor Huang Lijuan is treating the chronic heart failure with the benefits of temperature and yang, promoting blood circulation and diuresis as the basic treatment, and also relies on diarrhea and lung water and replenishing heart and yin.
文摘虚拟电厂(virtual power plant,VPP)可聚合多利益主体的分布式资源(distributed energy resources,DER)参与电力市场,以深入挖掘分布式能源的调度潜力,如何考虑各运行主体的协同调度,提高整体收益成为当前亟需解决的重要问题。基于此,提出了计及风光及市场电价不确定风险和多主体协同的虚拟电厂参与主辅市场联合优化策略。首先,建立电动汽车群体(electric vehicle duster,EVC)的可调度域评估模型,在此基础上考虑VPP与EVC两主体的利益均衡,提出VPP与EVC主从博弈的主能量市场日前竞标模型;其次,考虑电池储能系统(battery energy storage system,BESS)快速充放电的特性,进一步提出VPP参与主能量市场和辅助调频市场的日前联合投标模型和VPP实时调整及调频响应模型;最后,在日前联合投标模型中引入条件风险价值(condition value at risk,CVaR),衡量日前投标收益与不确定风险的关系。基于某省电力市场规则进行算例仿真表明,所提VPP优化策略能通过提供调频服务和鼓励EV响应调度提高VPP的综合收益。
基金The financial supports for this research,from the National Natural Science Foundation of China(Grant No52006065)Fundamental Research Funds for Central Universities(2022BJ0273,2023JC001)。
文摘Recently,natural draft dry cooling system with the main-auxiliary integrated air-cooled heat exchangers in the up and lower layers,has drawn attention to the electric power industry.This research firstly develops two physical models for the integrated cooling system,namely Case A and Case B.In Case A,the main air-cooled heat exchanger is arranged in the upper layer and the auxiliary air-cooled heat exchanger arranged in the lower layer,while in Case B,the two heat exchanger systems are arranged in the opposite way.And then,directing at the engineering TMCR and TRL 1 working conditions,the unit-local-overall thermo-flow characteristics of Case A and Case B are obtained and compared by numerical simulation.The findings show that,for the auxiliary air-cooled exchanger,Case A has obviously higher cooling performances than Case B,with the difference varying from 5.46%to 7.55%.Whereas,for the main air-cooled exchanger,Case B shows the recovered cooling performances,with the difference changing from 1.15%to 2.99%.Case A is preferably recommended to the engineering application in consideration of more strict cooling demand of the auxiliary cooling system.Conclusively,this research will provide some theoretical guidelines for the design and construction of the main-auxiliary integrated natural draft dry cooling system.
