针对高层结构在水平及竖向(双向)地震共同作用下的振动控制问题,基于隔震和调谐质量阻尼器振动控制原理,文章研究单一组合调谐质量阻尼器(single combined tuned mass damper,SC-TMD)体系、多重组合调谐质量阻尼器(multiple combined tu...针对高层结构在水平及竖向(双向)地震共同作用下的振动控制问题,基于隔震和调谐质量阻尼器振动控制原理,文章研究单一组合调谐质量阻尼器(single combined tuned mass damper,SC-TMD)体系、多重组合调谐质量阻尼器(multiple combined tuned mass damper,MC-TMD)体系、隔震体系、SC-TMD与隔震混合体系、MC-TMD与隔震混合体系5种控制策略在双向地震作用下结构的振动控制效果,选取20层钢结构Benchmark模型,采用ANSYS软件建立各体系的有限元模型,分析对比结构在双向地震作用下水平和竖向的振动响应。结果表明:MC-TMD体系、SC-TMD体系及SC-TMD与隔震混合体系对水平振动的控制效果更优;隔震体系抑制水平响应明显但会放大竖向加速度;MC-TMD与隔震混合体系对2个方向的结构振动响应均有良好的抑制效果。展开更多
In order to enable quality-aware web services selection in the process of service composition,this paper first describes the non-functional requirements of service consumers and the quality of elementary service or co...In order to enable quality-aware web services selection in the process of service composition,this paper first describes the non-functional requirements of service consumers and the quality of elementary service or composite service as a quality vector,and then models the QoS（quality of service）-aware composition as a multiple criteria optimization problem in extending directed graph.A novel simulated annealing algorithm for QoS-aware web services composition is presented.A normalizing for composite service QoS values is made,and a secondary iterative optimization is used in the algorithm.Experimental results show that the simulated annealing algorithm can satisfy the multiple criteria and global QoS requirements of service consumers.The algorithm produces near optimum solution with much less computation cost.展开更多
Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theo...Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theory. At the same time, the possibility of increasing yield and protein content in the grain through cultivation technique was also studied. The conclusions were：展开更多
文摘针对高层结构在水平及竖向(双向)地震共同作用下的振动控制问题,基于隔震和调谐质量阻尼器振动控制原理,文章研究单一组合调谐质量阻尼器(single combined tuned mass damper,SC-TMD)体系、多重组合调谐质量阻尼器(multiple combined tuned mass damper,MC-TMD)体系、隔震体系、SC-TMD与隔震混合体系、MC-TMD与隔震混合体系5种控制策略在双向地震作用下结构的振动控制效果,选取20层钢结构Benchmark模型,采用ANSYS软件建立各体系的有限元模型,分析对比结构在双向地震作用下水平和竖向的振动响应。结果表明:MC-TMD体系、SC-TMD体系及SC-TMD与隔震混合体系对水平振动的控制效果更优;隔震体系抑制水平响应明显但会放大竖向加速度;MC-TMD与隔震混合体系对2个方向的结构振动响应均有良好的抑制效果。
基金The National Natural Science Foundation of China(No.60773217)Free Exploration Project(985 Project of Renmin University of China)(No.21361231)
文摘In order to enable quality-aware web services selection in the process of service composition,this paper first describes the non-functional requirements of service consumers and the quality of elementary service or composite service as a quality vector,and then models the QoS（quality of service）-aware composition as a multiple criteria optimization problem in extending directed graph.A novel simulated annealing algorithm for QoS-aware web services composition is presented.A normalizing for composite service QoS values is made,and a secondary iterative optimization is used in the algorithm.Experimental results show that the simulated annealing algorithm can satisfy the multiple criteria and global QoS requirements of service consumers.The algorithm produces near optimum solution with much less computation cost.
文摘Different ratios of NPK were adopted in this research to study its effects on the objective traits of 2 early forage-rice varieties, and to obtain the optimum ratio to further improve the application technique in theory. At the same time, the possibility of increasing yield and protein content in the grain through cultivation technique was also studied. The conclusions were：
