A new species, Aulonogria macroa, sp. nov. belonging to Lagriidae is described from China in the present paper. The type specimens are deposited in the Insect Collection of Southwest Agricultural University.
Two species of whitefly （Hemiptera： Aleyrodidae）, Aleuroclava ayyari （Sundararaj ＆ David） and Aleurotrachelus grewiae Takahashi, new to the known fauna of China, are redescribed with morphological illustrations ...Two species of whitefly （Hemiptera： Aleyrodidae）, Aleuroclava ayyari （Sundararaj ＆ David） and Aleurotrachelus grewiae Takahashi, new to the known fauna of China, are redescribed with morphological illustrations and photographs from a scanning electron microscope （SEM）. A. ayyari is characterized by the presence of two pairs of long subdorsal setae on the cephalic region and first abdominal segment. A. grewiae is characterized by the pupa case sclerotized, pointed at both ends and the base of abdomen rounded at the middle. Specimens are deposited in the Insect Collection of Yangzhou University.展开更多
Given the extensive utilization of cantilever retaining walls in construction and development projects,their optimal design and analysis with proper attention to seismic loads is a typical engineering problem.This res...Given the extensive utilization of cantilever retaining walls in construction and development projects,their optimal design and analysis with proper attention to seismic loads is a typical engineering problem.This research presents a new algorithm for pseudo-static analysis of retaining walls employing upper bound method.The algorithm can be utilized to design and check the external and internal stability of the wall based on the proposed mechanism.One of the main features of this algorithm is its ability to determine the critical condition of failure wedges,the minimum safety factor and maximum force acting on the wall,as well as the minimum weight of the wall,simultaneously,by effectively using the multi-objective optimization.The results obtained by the proposed failure mechanisms show that,while using the upper bound limit analysis approach,the active force should be maximized concurrent with optimizing the direction of the plane passing through the back of the heel.The present study also applies the proposed algorithm to determine the critical direction of the earthquake acceleration coefficient.The critical direction of earthquake acceleration coefficient is defined as the direction that maximizes the active force exerted on the wall and minimizes the safety factor for wall stability.The results obtained in this study are in good agreement with those of similar studies carried out based on the limit equilibrium method and finite element analysis.The critical failure mechanisms were determined via optimization with genetic algorithm.展开更多
基金Supported by National Natural Science Foundation of china (NNSFC39970095)
文摘A new species, Aulonogria macroa, sp. nov. belonging to Lagriidae is described from China in the present paper. The type specimens are deposited in the Insect Collection of Southwest Agricultural University.
基金funded by the Special Fund for Agro-scientific Research in the Public Interest of China (201303019)the Scientific Innovation Research of the Graduate College in Jiangsu Province,China (KYZZ-0366)
文摘Two species of whitefly （Hemiptera： Aleyrodidae）, Aleuroclava ayyari （Sundararaj ＆ David） and Aleurotrachelus grewiae Takahashi, new to the known fauna of China, are redescribed with morphological illustrations and photographs from a scanning electron microscope （SEM）. A. ayyari is characterized by the presence of two pairs of long subdorsal setae on the cephalic region and first abdominal segment. A. grewiae is characterized by the pupa case sclerotized, pointed at both ends and the base of abdomen rounded at the middle. Specimens are deposited in the Insect Collection of Yangzhou University.
文摘Given the extensive utilization of cantilever retaining walls in construction and development projects,their optimal design and analysis with proper attention to seismic loads is a typical engineering problem.This research presents a new algorithm for pseudo-static analysis of retaining walls employing upper bound method.The algorithm can be utilized to design and check the external and internal stability of the wall based on the proposed mechanism.One of the main features of this algorithm is its ability to determine the critical condition of failure wedges,the minimum safety factor and maximum force acting on the wall,as well as the minimum weight of the wall,simultaneously,by effectively using the multi-objective optimization.The results obtained by the proposed failure mechanisms show that,while using the upper bound limit analysis approach,the active force should be maximized concurrent with optimizing the direction of the plane passing through the back of the heel.The present study also applies the proposed algorithm to determine the critical direction of the earthquake acceleration coefficient.The critical direction of earthquake acceleration coefficient is defined as the direction that maximizes the active force exerted on the wall and minimizes the safety factor for wall stability.The results obtained in this study are in good agreement with those of similar studies carried out based on the limit equilibrium method and finite element analysis.The critical failure mechanisms were determined via optimization with genetic algorithm.
