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颅骨测量数据揭示欧亚大陆东部史前人群扩散的"二层"模式

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南方文物 2020年第2期 226-241页

作者：松村博文洪晓纯 Charles Higham 张弛山形真理子 Lan Cuong Nguyen 李珍范雪春 Truman Simanjuntak Adhi Agus Oktaviana 何嘉宁陈仲玉潘建国贺刚孙国平黄渭金李新伟魏兴涛 Kate Domett Sin Halcrow Kim Dung Nguyen Hoang Hiep Trinh Chi Hoang Bui Khanh Trung Kien Nguyen Andreas Reinecke 邓婉文(译) 赵春光(译) 洪晓纯(校) 不详北京大学考古文博学院武汉大学历史学院考古学系澳大利亚国立大学考古与自然史学系

本文是基于考古发掘获取的人骨遗存在内的89组古代及现代的人群样本而做的颅骨形态测量研究,侧重说明解剖学意义上的现代人(anatomically modern humans)在欧亚大陆东部演化分布的“二层”模式。距今6.5万~5万年以前,“第一层”现代人... 详细信息

本文是基于考古发掘获取的人骨遗存在内的89组古代及现代的人群样本而做的颅骨形态测量研究,侧重说明解剖学意义上的现代人(anatomically modern humans)在欧亚大陆东部演化分布的“二层”模式。距今6.5万~5万年以前,“第一层”现代人经东南亚大陆向东、向南扩散,他们与现今安达曼人、澳大利亚人、巴布亚人的祖先以及日本绳纹时代人群最为接近。距今约九千年前,拥有东北亚血统的“第二层”现代人出现在中国中部地区,并于距今四千年前后向南扩张至东南亚地区,这些人群在颅骨形态上与西伯利亚人具有密切的亲缘关系。上述两大人群最初交流有限,在农业能够支撑增加人口密度的情境下,“第二层”现代人增长速度较快,人口数量较多。这两层人群显著的二重结构特征,表明了现代人在欧亚大陆南、北不同迁移路线间的历时性差异。

关键词：欧亚大陆澳大利亚人二重结构中国中部地区东南亚地区增长速度考古发掘绳纹时代

An easily-prepared impedance matched Josephson parametric amplifier

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Chinese Physics B 2021年第6期30卷 48-51页

作者： Ya-Peng Lu Quan Zuo Jia-Zheng Pan Jun-Liang Jiang Xing-Yu Wei Zi-Shuo Li Wen-Qu Xu Kai-Xuan Zhang Ting-Ting Guo Shuo Wang Chun-Hai Cao Wei-Wei Xu Guo-Zhu Sun Pei-Heng Wu Research Institute of Superconductor Electronics School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Purple Mountain Laboratories Nanjing 211111China

An impedance matched parametric amplifier(IMPA)with Josephson junctions is fabricated and characterized.A hybrid structure containing coplanar and strip structures is implemented to realize an impedance taper line and a plate capacitor in an LC nonlinear resonator based on Josephson *** upper plate of the capacitor is isolated with SiNx without grounding as well as the *** easily-prepared designs greatly reduce the requirements for lithography alignment and precision,which makes the fabrication process more *** experimental results show that in such IMPA a gain higher than 25 dB with a bandwidth of about 100 MHz can be *** broadband amplifier operates close to the quantum *** adjusting the working point,a higher bandwidth of about 400 MHz can be obtained with a gain of about 17 dB.

关键词： Josephson junction parametric amplification impedance matching gain and bandwidth

Compact NbN resonators with high kinetic inductance

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Chinese Physics B 2020年第12期29卷 107-111页

作者： Xing-Yu Wei Jia-Zheng Pan Ya-Peng Lu Jun-Liang Jiang Zi-Shuo Li Sheng Lu Xue-Cou Tu Qing-Yuan Zhao Xiao-Qing Jia Lin Kang Jian Chen Chun-Hai Cao Hua-Bing Wang Wei-Wei Xu Guo-Zhu Sun Pei-Heng Wu Research Institute of Superconductor Electronics School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Purple Mountain Laboratories Nanjing 211111China

We design and fabricateλ/2 coplanar waveguide NbN resonators,the thickness and length of which are only several nanometers and hundred microns,*** quality factor of such compact resonators can reach up to 7.5×10~4 at single photon power level at 30 m K with the resonance frequency around 6.835 *** order to tune the resonant frequency,the resonator is terminated to the ground with a *** tuning the magnetic flux in the dc-SQUID,the effective inductance of the dc-SQUID is varied,which leads to the change in the resonant frequency of the *** tunability range is more than 30 MHz and the quality factor is about 3×10~*** compact and tunable NbN resonators have potential applications in the quantum information processing,such as in the precision measurement,coupling and/or reading out the quantum states of qubits.

关键词： superconducting resonator NbN kinetic inductance tunable resonator