重庆中坝遗址地层Rb、Sr、Hg及TOC研究表明:Rb、Sr和Rb/Sr值较好地反映了约4250 a B.P.以来气候变化过程,主要干冷期可与敦德冰川δ18O曲线谷值、湖光岩沉积物磁化率和Ti曲线峰值、以及大气14C浓度峰值和太阳活动水平较长期变化的低谷对...重庆中坝遗址地层Rb、Sr、Hg及TOC研究表明:Rb、Sr和Rb/Sr值较好地反映了约4250 a B.P.以来气候变化过程,主要干冷期可与敦德冰川δ18O曲线谷值、湖光岩沉积物磁化率和Ti曲线峰值、以及大气14C浓度峰值和太阳活动水平较长期变化的低谷对比,反映出地层中Rb、Sr不易受人类活动干扰的特性。结合考古遗存对比还发现,Hg、P、Ca、Mg和TOC记录了该遗址约4250 a B.P.以来人类活动的三个不同演变阶段。进一步研究认为,盐业遗址的衰落可能与洪水事件。展开更多
Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the ...Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the silic on body thickness,are comprehensively analyzed and optimized.The optimal region of feasible Ge mole fraction and the silicon body thickness for low operating po wer device are given.As the simulation results show that through changing Ge mole fraction coupl ed with the silicon body thickness tuning,UTB device with good performance can b e obtained.展开更多
文摘重庆中坝遗址地层Rb、Sr、Hg及TOC研究表明:Rb、Sr和Rb/Sr值较好地反映了约4250 a B.P.以来气候变化过程,主要干冷期可与敦德冰川δ18O曲线谷值、湖光岩沉积物磁化率和Ti曲线峰值、以及大气14C浓度峰值和太阳活动水平较长期变化的低谷对比,反映出地层中Rb、Sr不易受人类活动干扰的特性。结合考古遗存对比还发现,Hg、P、Ca、Mg和TOC记录了该遗址约4250 a B.P.以来人类活动的三个不同演变阶段。进一步研究认为,盐业遗址的衰落可能与洪水事件。
文摘Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the silic on body thickness,are comprehensively analyzed and optimized.The optimal region of feasible Ge mole fraction and the silicon body thickness for low operating po wer device are given.As the simulation results show that through changing Ge mole fraction coupl ed with the silicon body thickness tuning,UTB device with good performance can b e obtained.
