To study the seismic performance of double-skin steelconcrete composite box（ DSCB） piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the ste...To study the seismic performance of double-skin steelconcrete composite box（ DSCB） piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the steel plate thickness, the axial load ratio, the slenderness ratio and the aspect ratio were taken into consideration. The damage evolution process and failure modes of the tested specimens are presented in detail. Test results are also discussed in terms of the hysteretic curve, skeleton curve, ductility and energy dissipation capacity of DSCB pier specimens. It can be concluded that the hysteretic performance of DSCB piers in one direction is affected and weakened by the cyclic loading in the other direction. DSCB piers under bidirectional cyclic loading exhibit good performance in terms of load carrying capacity, ductility, and energy dissipation capacity. Overall, DSCB piers can meet the basic aseismic requirements. The research results can be taken as a reference for using DSCB piers as high piers in bridges in strong earthquakeprone areas.展开更多
A novel SCR on-chip ESD device is proposed to protect IC chips against ESD stressing in two opposite direc- tions. The triggering voltages of four types of dual direction SCRs （DDSCR） are compared and analyzed, pMOS...A novel SCR on-chip ESD device is proposed to protect IC chips against ESD stressing in two opposite direc- tions. The triggering voltages of four types of dual direction SCRs （DDSCR） are compared and analyzed, pMOS or nMOS are embedded into the structures to adjust their triggering voltages. Both MOSFETs embedded DDSCRs have tunable triggering voltage,low DC leakage （～pA）, and fast turn on speed snapback I-V characteristics without latch-up problem. It achieves high ESD performance of ～94V/μm. The new ESD protection devices are area efficient and can reduce the parasitic effects significantly.展开更多
The embedding technique based on an operator appeared in [Liu, Y. P., Scientia Sinica, Special Issue on Math,1 (1979),191-201 (in Chinese)] for determining the maximum non-orientable genus of a graph is developed to o...The embedding technique based on an operator appeared in [Liu, Y. P., Scientia Sinica, Special Issue on Math,1 (1979),191-201 (in Chinese)] for determining the maximum non-orientable genus of a graph is developed to obtain the general theorem which presents a necessary and sufficient condition for a graph to be embeddable into either the orientable or the non-orientable surface of genus k. Furthermore,the greatest lower bound of the lengths of genus ranges of the class of nonplanar graphs which are up-embeddable is also obtained.展开更多
基金The National Natural Science Foundation of China(No.5117810151378112)the Doctoral Fund of Ministry of Education(No.20110092110011)
文摘To study the seismic performance of double-skin steelconcrete composite box（ DSCB） piers, a total of 11 DSCB pier specimens were tested under bidirectional cyclic loading. The effects of the loading pattern, the steel plate thickness, the axial load ratio, the slenderness ratio and the aspect ratio were taken into consideration. The damage evolution process and failure modes of the tested specimens are presented in detail. Test results are also discussed in terms of the hysteretic curve, skeleton curve, ductility and energy dissipation capacity of DSCB pier specimens. It can be concluded that the hysteretic performance of DSCB piers in one direction is affected and weakened by the cyclic loading in the other direction. DSCB piers under bidirectional cyclic loading exhibit good performance in terms of load carrying capacity, ductility, and energy dissipation capacity. Overall, DSCB piers can meet the basic aseismic requirements. The research results can be taken as a reference for using DSCB piers as high piers in bridges in strong earthquakeprone areas.
基金the Natural Science Foundation of Jiangsu Province(No.BK2007026)the Natural Science Foundation of Zhejiang Province(No.Y107055)~~
文摘A novel SCR on-chip ESD device is proposed to protect IC chips against ESD stressing in two opposite direc- tions. The triggering voltages of four types of dual direction SCRs （DDSCR） are compared and analyzed, pMOS or nMOS are embedded into the structures to adjust their triggering voltages. Both MOSFETs embedded DDSCRs have tunable triggering voltage,low DC leakage （～pA）, and fast turn on speed snapback I-V characteristics without latch-up problem. It achieves high ESD performance of ～94V/μm. The new ESD protection devices are area efficient and can reduce the parasitic effects significantly.
文摘The embedding technique based on an operator appeared in [Liu, Y. P., Scientia Sinica, Special Issue on Math,1 (1979),191-201 (in Chinese)] for determining the maximum non-orientable genus of a graph is developed to obtain the general theorem which presents a necessary and sufficient condition for a graph to be embeddable into either the orientable or the non-orientable surface of genus k. Furthermore,the greatest lower bound of the lengths of genus ranges of the class of nonplanar graphs which are up-embeddable is also obtained.
