传统的电力通信支撑网主要依靠光纤网络等有线接入技术实现生产控制与信息管理,随着配电自动化、精准负荷控制、用电信息智能采集、输变电巡检监测、充电桩管理以及视频监控等数字化、智能化业务的需求日益旺盛,采用移动通信技术配合光...传统的电力通信支撑网主要依靠光纤网络等有线接入技术实现生产控制与信息管理,随着配电自动化、精准负荷控制、用电信息智能采集、输变电巡检监测、充电桩管理以及视频监控等数字化、智能化业务的需求日益旺盛,采用移动通信技术配合光纤技术共同实现的可智能感知、灵活组网且成本可控的新一代电力通信支撑网逐渐被电力行业客户所认可。移动通信技术经过多年发展,目前已经迈入了第五代发展时代(5G移动通信技术),并在技术层面逐步成熟,我国基本形成了5G、4G移动通信网以及由频分双工-长期演进(Frequency Division Duplexing-Long Term Evolution,FDD-LTE)技术演进而来的窄带物联网(Narrow Band Internet of Things,NB-IoT)协同发展的新局面。结合自身工作实践,就5G移动通信技术在新一代电力通信支撑网中的应用展开部分探讨性分析。展开更多
Determining initial pretension values of pre-stressed cables is one of the key problems for a steel mega frame and pre-stressed composite bracing structure.Through the mechanical analysis of the composite bracing unde...Determining initial pretension values of pre-stressed cables is one of the key problems for a steel mega frame and pre-stressed composite bracing structure.Through the mechanical analysis of the composite bracing under vertical loading,the critical factors deciding the initial pretention value were found.According to these factors,a rule for the initial pretension value was put forward.The determination equations were acquired based on the principle of force equilibrium at nodes.The numerical results indicate that the internal force disequilibrium in composite bracings resulted from symmetrical load can be eliminated only in a symmetrical way,so that initial pretention values are decided only by vertical loads.The influencing coefficient leveling method,taking into account interactions between story and story,is accurate and feasible.展开更多
Restraining the aggregation and polysulfide dissolution of edge-enriched metal sulfides is of significance for their applications as anode materials of lithium-ion batteries(LIBs)with high capacity and long cycle-life...Restraining the aggregation and polysulfide dissolution of edge-enriched metal sulfides is of significance for their applications as anode materials of lithium-ion batteries(LIBs)with high capacity and long cycle-life.In this work,we have reported the incorporation of MoS2 nanocrystals into amorphous carbon on the surface of reduced graphene oxide(rGO)by balancing the decomposition rates of phenolic resin(PF)-impregnated ammonium thiomolybdate(ATM),which subsequently forms the MoS2@C/rGO film through redispersion and vacuum filtration.Such structural design effectively avoids the aggregation of MoS2 nanocrystals and Li2S loss,and meanwhile ion enrichment in amorphous carbon and diffusion reinforcement can greatly accelerate the electrochemical reaction kinetics.When applied as the selfstanding anode,the MoS2@C/rGO film possesses high reversible capacities of 1164 mA h g^-1 at the current density of 0.2 A g^-1 and 810 mA h g^-1 at 6.4 A g^-1.It also exhibits quite a high capacity retention after 1000 cycles at 3.2 A g^-1.This work develops the formation theory of incorporation structures and promotes their applications in energy storage devices.展开更多
文摘传统的电力通信支撑网主要依靠光纤网络等有线接入技术实现生产控制与信息管理,随着配电自动化、精准负荷控制、用电信息智能采集、输变电巡检监测、充电桩管理以及视频监控等数字化、智能化业务的需求日益旺盛,采用移动通信技术配合光纤技术共同实现的可智能感知、灵活组网且成本可控的新一代电力通信支撑网逐渐被电力行业客户所认可。移动通信技术经过多年发展,目前已经迈入了第五代发展时代(5G移动通信技术),并在技术层面逐步成熟,我国基本形成了5G、4G移动通信网以及由频分双工-长期演进(Frequency Division Duplexing-Long Term Evolution,FDD-LTE)技术演进而来的窄带物联网(Narrow Band Internet of Things,NB-IoT)协同发展的新局面。结合自身工作实践,就5G移动通信技术在新一代电力通信支撑网中的应用展开部分探讨性分析。
基金Project of Ministry of Housing and Urban-Rural Development of China(No.2012-K2-28)
文摘Determining initial pretension values of pre-stressed cables is one of the key problems for a steel mega frame and pre-stressed composite bracing structure.Through the mechanical analysis of the composite bracing under vertical loading,the critical factors deciding the initial pretention value were found.According to these factors,a rule for the initial pretension value was put forward.The determination equations were acquired based on the principle of force equilibrium at nodes.The numerical results indicate that the internal force disequilibrium in composite bracings resulted from symmetrical load can be eliminated only in a symmetrical way,so that initial pretention values are decided only by vertical loads.The influencing coefficient leveling method,taking into account interactions between story and story,is accurate and feasible.
基金supported by the National Natural Science Foundation of China(21975074 and 21838003)the Basic Research Program of Shanghai(17JC1402300)+1 种基金Shanghai Scientific and Technological Innovation Project(18JC1410500)the Fundamental Research Funds for the Central Universities(222201718002)。
文摘Restraining the aggregation and polysulfide dissolution of edge-enriched metal sulfides is of significance for their applications as anode materials of lithium-ion batteries(LIBs)with high capacity and long cycle-life.In this work,we have reported the incorporation of MoS2 nanocrystals into amorphous carbon on the surface of reduced graphene oxide(rGO)by balancing the decomposition rates of phenolic resin(PF)-impregnated ammonium thiomolybdate(ATM),which subsequently forms the MoS2@C/rGO film through redispersion and vacuum filtration.Such structural design effectively avoids the aggregation of MoS2 nanocrystals and Li2S loss,and meanwhile ion enrichment in amorphous carbon and diffusion reinforcement can greatly accelerate the electrochemical reaction kinetics.When applied as the selfstanding anode,the MoS2@C/rGO film possesses high reversible capacities of 1164 mA h g^-1 at the current density of 0.2 A g^-1 and 810 mA h g^-1 at 6.4 A g^-1.It also exhibits quite a high capacity retention after 1000 cycles at 3.2 A g^-1.This work develops the formation theory of incorporation structures and promotes their applications in energy storage devices.
