提出了一种连续梁桥高效阻尼体系(efficient damping system of continuous girder bridge, EDB),通过放大阻尼器的相对位移来提高耗能效率.为了研究该阻尼体系在连续梁桥抗震中的适用性,设计制作了3倍位移放大型阻尼器和普通阻尼器的...提出了一种连续梁桥高效阻尼体系(efficient damping system of continuous girder bridge, EDB),通过放大阻尼器的相对位移来提高耗能效率.为了研究该阻尼体系在连续梁桥抗震中的适用性,设计制作了3倍位移放大型阻尼器和普通阻尼器的试验模型,并在正弦波作用下进行往复加载试验.分析了不同试验工况下阻尼器的滞回曲线,并将理论值与试验值进行了对比,验证了其放大效果.以一座6跨连续桥梁为工程背景,基于有限元软件建立其多质点模型,分析了不同减震方案在3条地震波作用下的墩底剪力、墩底弯矩、位移、滞回曲线、能量耗散曲线.研究结果表明,连续梁桥高效阻尼体系有效地耗散了地震能量,减小了桥梁结构的地震响应.展开更多
Within a wireless opportunistic network,one of the lucky users gets an opportunity to utilize thewhole radio resource.However some of the unlucky users keep silent during an unexpected period result-ing from severe wi...Within a wireless opportunistic network,one of the lucky users gets an opportunity to utilize thewhole radio resource.However some of the unlucky users keep silent during an unexpected period result-ing from severe wireless environment and imperfect scheduling algorithms .An opportunistic cooperationprotocol is proposed that can achieve equivalent performance measured in terms of outage probability,inwhich scheme the opportunistic user helps to relay what need retransmitting indicated by the destinationand selects the appropriate power allocation to pursue fairness.The proposed scheme deploys superposi-tion coding and successive interference cancellation at relay and destination,respectively .To improve thespectral efficiency,the modified cooperation architecture involves two opportunistic users which work inturn.The simulation results demonstrate that the protocol obtains better performance compared with theconventional methods.展开更多
Aqueous organic flow batteries have attracted dramatic attention for stationary energy storage due to their resource sustainability and low cost. However, the current reported systems can normally be operated stably u...Aqueous organic flow batteries have attracted dramatic attention for stationary energy storage due to their resource sustainability and low cost. However, the current reported systems can normally be operated stably under a nitrogen or argon atmosphere due to their poor stability. Herein a stable airinsensitive biphenol derivative cathode, 3,30,5,50-tetramethylaminemethylene-4,40-biphenol(TABP), with high solubility(>1.5 mol L^(-1)) and redox potential(0.91 V vs. SHE) is designed and synthesized by a scalable one-step method. Paring with silicotungstic acid(SWO), an SWO/TABP flow battery shows a stable performance of zero capacity decay over 900 cycles under the air atmosphere. Further, an SWO/TABP flow battery manifests a high rate performance with an energy efficiency of 85% at a current density of60 m A cm^(-2) and a very high volumetric capacity of more than 47 Ah L^(-1). This work provides a new and practical option for next-generation practical large-scale energy storage.展开更多
文摘提出了一种连续梁桥高效阻尼体系(efficient damping system of continuous girder bridge, EDB),通过放大阻尼器的相对位移来提高耗能效率.为了研究该阻尼体系在连续梁桥抗震中的适用性,设计制作了3倍位移放大型阻尼器和普通阻尼器的试验模型,并在正弦波作用下进行往复加载试验.分析了不同试验工况下阻尼器的滞回曲线,并将理论值与试验值进行了对比,验证了其放大效果.以一座6跨连续桥梁为工程背景,基于有限元软件建立其多质点模型,分析了不同减震方案在3条地震波作用下的墩底剪力、墩底弯矩、位移、滞回曲线、能量耗散曲线.研究结果表明,连续梁桥高效阻尼体系有效地耗散了地震能量,减小了桥梁结构的地震响应.
基金supported by the National Nature Science Foundation of China(No.60674009)the High Technology Research and Development Programme of China(No.2006AA01Z270)
文摘Within a wireless opportunistic network,one of the lucky users gets an opportunity to utilize thewhole radio resource.However some of the unlucky users keep silent during an unexpected period result-ing from severe wireless environment and imperfect scheduling algorithms .An opportunistic cooperationprotocol is proposed that can achieve equivalent performance measured in terms of outage probability,inwhich scheme the opportunistic user helps to relay what need retransmitting indicated by the destinationand selects the appropriate power allocation to pursue fairness.The proposed scheme deploys superposi-tion coding and successive interference cancellation at relay and destination,respectively .To improve thespectral efficiency,the modified cooperation architecture involves two opportunistic users which work inturn.The simulation results demonstrate that the protocol obtains better performance compared with theconventional methods.
基金The authors acknowledge financial support from the National Natural Science Foundation of China(21925804,21935003)CASDOE Collaborative Project(121421KYSB20170032)+1 种基金CAS Engineering Laboratory for Electrochemical Energy Storage,Liaoning Revitalization Talents Program(XLYC1802050)China and DICP funding,China(ZZBS201707)。
文摘Aqueous organic flow batteries have attracted dramatic attention for stationary energy storage due to their resource sustainability and low cost. However, the current reported systems can normally be operated stably under a nitrogen or argon atmosphere due to their poor stability. Herein a stable airinsensitive biphenol derivative cathode, 3,30,5,50-tetramethylaminemethylene-4,40-biphenol(TABP), with high solubility(>1.5 mol L^(-1)) and redox potential(0.91 V vs. SHE) is designed and synthesized by a scalable one-step method. Paring with silicotungstic acid(SWO), an SWO/TABP flow battery shows a stable performance of zero capacity decay over 900 cycles under the air atmosphere. Further, an SWO/TABP flow battery manifests a high rate performance with an energy efficiency of 85% at a current density of60 m A cm^(-2) and a very high volumetric capacity of more than 47 Ah L^(-1). This work provides a new and practical option for next-generation practical large-scale energy storage.
