Here we describe tHuashancyprinus robustispinus, gen. et sp. nov, a fossil cyprinin fish from the Oligocene of Ningming Ba- sin, Guangxi, South China. It differs from all other cyprinin fishes in the following apomorp...Here we describe tHuashancyprinus robustispinus, gen. et sp. nov, a fossil cyprinin fish from the Oligocene of Ningming Ba- sin, Guangxi, South China. It differs from all other cyprinin fishes in the following apomorphic characters： extremely robust last unbranched dorsal and anal fin rays with very fine serrations along posterior edge, the crowns of pharyngeal teeth A2 and A3 with a number of deep grooves on the lateral wall, rather large A3, and relatively deep infraorbital 2. Among the members of the Tribe Cyprinini sensu stricto, it mostly resembles the extant genus Cyprinus, particularly to species Cyprinus micristius and C. fuxianensis, which are restricted to Yunnan, southwestern China. The discovery of the cyprinin Huashancyprinus from southern China, along with the previously known late Eocene tCyprinus maomingensis, indicates an early branching of the Cyprininae （Cyprinidae） in this area.展开更多
功率半导体器件以其优越的电特性在许多领域取代了传统的双极型晶体管。功率半导体器件导通电阻由于受击穿电压限制而存在一个极限即硅限而无法再降低。"超级结理论"的应用,使导通电阻相对于传统技术降低了80%~90%,打破了硅限...功率半导体器件以其优越的电特性在许多领域取代了传统的双极型晶体管。功率半导体器件导通电阻由于受击穿电压限制而存在一个极限即硅限而无法再降低。"超级结理论"的应用,使导通电阻相对于传统技术降低了80%~90%,打破了硅限,提高了开关速度。通过对腔体压力、温度、RF功率、气体流量、硅片图形密度和刻蚀面积等各种工艺参数的实验,研究其对深沟槽超级结(Deep Trench Super Junction)高压器件干法刻蚀工艺的影响与作用,实现单步干法刻蚀就在硅衬底上形成深沟槽。展开更多
基金supported by National Natural Science Foundation of China(Grant Nos.40432003 and 40662001)State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology,CAS)(Grant No.063106)Cypriniformes Tree of life under the U.S.National Science Foundation to R.Mayden(Grant No. EFO431326),and the Culture Department of Guangxi Zhuang Autonomous Region
文摘Here we describe tHuashancyprinus robustispinus, gen. et sp. nov, a fossil cyprinin fish from the Oligocene of Ningming Ba- sin, Guangxi, South China. It differs from all other cyprinin fishes in the following apomorphic characters： extremely robust last unbranched dorsal and anal fin rays with very fine serrations along posterior edge, the crowns of pharyngeal teeth A2 and A3 with a number of deep grooves on the lateral wall, rather large A3, and relatively deep infraorbital 2. Among the members of the Tribe Cyprinini sensu stricto, it mostly resembles the extant genus Cyprinus, particularly to species Cyprinus micristius and C. fuxianensis, which are restricted to Yunnan, southwestern China. The discovery of the cyprinin Huashancyprinus from southern China, along with the previously known late Eocene tCyprinus maomingensis, indicates an early branching of the Cyprininae （Cyprinidae） in this area.
文摘功率半导体器件以其优越的电特性在许多领域取代了传统的双极型晶体管。功率半导体器件导通电阻由于受击穿电压限制而存在一个极限即硅限而无法再降低。"超级结理论"的应用,使导通电阻相对于传统技术降低了80%~90%,打破了硅限,提高了开关速度。通过对腔体压力、温度、RF功率、气体流量、硅片图形密度和刻蚀面积等各种工艺参数的实验,研究其对深沟槽超级结(Deep Trench Super Junction)高压器件干法刻蚀工艺的影响与作用,实现单步干法刻蚀就在硅衬底上形成深沟槽。
