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Proton-assisted growth of ultra-flat graphene films 期刊论文
NATURE, 2020, 577 (7789) : 204-+
作者:  Yuan, Guowen;  Lin, Dongjing;  Wang, Yong;  Huang, Xianlei;  Chen, Wang;  Xie, Xuedong;  Zong, Junyu;  Yuan, Qian-Qian;  Zheng, Hang;  Wang, Di;  Xu, Jie;  Li, Shao-Chun;  Zhang, Yi;  Sun, Jian;  Xi, Xiaoxiang;  Gao, Libo
收藏  |  浏览/下载:33/0  |  提交时间:2020/07/03

Graphene films grown by chemical vapour deposition have unusual physical and chemical properties that offer promise for applications such as flexible electronics and high-frequency transistors(1-10). However, wrinkles invariably form during growth because of the strong coupling to the substrate, and these limit the large-scale homogeneity of the film(1-4,11,12). Here we develop a proton-assisted method of chemical vapour deposition to grow ultra-flat graphene films that are wrinkle-free. Our method of proton penetration(13-17) and recombination to form hydrogen can also reduce the wrinkles formed during traditional chemical vapour deposition of graphene. Some of the wrinkles disappear entirely, owing to the decoupling of van der Waals interactions and possibly an increase in distance from the growth surface. The electronic band structure of the as-grown graphene films shows a V-shaped Dirac cone and a linear dispersion relation within the atomic plane or across an atomic step, confirming the decoupling from the substrate. The ultra-flat nature of the graphene films ensures that their surfaces are easy to clean after a wet transfer process. A robust quantum Hall effect appears even at room temperature in a device with a linewidth of 100 micrometres. Graphene films grown by proton-assisted chemical vapour deposition should largely retain their intrinsic performance, and our method should be easily generalizable to other nanomaterials for strain and doping engineering.


  
Negative supercoil at gene boundaries modulates gene topology 期刊论文
NATURE, 2020, 577 (7792) : 701-+
作者:  Yuan, Guowen;  Lin, Dongjing;  Wang, Yong;  Huang, Xianlei;  Chen, Wang;  Xie, Xuedong;  Zong, Junyu;  Yuan, Qian-Qian;  Zheng, Hang;  Wang, Di;  Xu, Jie;  Li, Shao-Chun;  Zhang, Yi;  Sun, Jian;  Xi, Xiaoxiang;  Gao, Libo
收藏  |  浏览/下载:55/0  |  提交时间:2020/07/03

Transcription challenges the integrity of replicating chromosomes by generating topological stress and conflicts with forks(1,2). The DNA topoisomerases Top1 and Top2 and the HMGB family protein Hmo1 assist DNA replication and transcription(3-6). Here we describe the topological architecture of genes in Saccharomyces cerevisiae during the G1 and S phases of the cell cycle. We found under-wound DNA at gene boundaries and over-wound DNA within coding regions. This arrangement does not depend on Pol II or S phase. Top2 and Hmo1 preserve negative supercoil at gene boundaries, while Top1 acts at coding regions. Transcription generates RNA-DNA hybrids within coding regions, independently of fork orientation. During S phase, Hmo1 protects under-wound DNA from Top2, while Top2 confines Pol II and Top1 at coding units, counteracting transcription leakage and aberrant hybrids at gene boundaries. Negative supercoil at gene boundaries prevents supercoil diffusion and nucleosome repositioning at coding regions. DNA looping occurs at Top2 clusters. We propose that Hmo1 locks gene boundaries in a cruciform conformation and, with Top2, modulates the architecture of genes that retain the memory of the topological arrangements even when transcription is repressed.


  
Thermodynamically stabilized beta-CsPbI3-based perovskite solar cells with efficiencies > 18% 期刊论文
SCIENCE, 2019, 365 (6453) : 591-+
作者:  Wang, Yong;  Dar, M. Ibrahim;  Ono, Luis K.;  Zhang, Taiyang;  Kan, Miao;  Li, Yawen;  Zhang, Lijun;  Wang, Xingtao;  Yang, Yingguo;  Gao, Xingyu;  Qi, Yabing;  Gratzel, Michael;  Zhao, Yixin
收藏  |  浏览/下载:23/0  |  提交时间:2019/11/27
Temporal disparity of the atmospheric systems contributing to interannual variation of wintertime haze pollution in the North China Plain 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019
作者:  Chen, Shangfeng;  Guo, Jianping;  Song, Linye;  Cohen, Jason B.;  Wang, Yong
收藏  |  浏览/下载:18/0  |  提交时间:2019/11/26
atmospheric circulations  haze pollution  interdecadal change  mid-1990s  North China Plain  
Synoptic Conditions and Moisture Sources for Extreme Snowfall Events Over East China 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (2) : 601-623
作者:  Yang, Zifan;  Huang, Wenyu;  He, Xinsheng;  Wang, Yong;  Qiu, Tianpei;  Wright, Jonathon S.;  Wang, Bin
收藏  |  浏览/下载:28/0  |  提交时间:2019/04/09
extreme snowfall events  circumglobal teleconnection  central Siberian blocking activities  evaporative moisture source  moisture recycling  Lagrangian approach  
大别-苏鲁造山带橄榄岩中橄榄石异常组构成因研究 项目
项目编号:41872230; 经费:660000(CNY); 起止日期:2019 / dc_date_end
项目负责人:  王永锋
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/27
青藏高原东北缘临夏盆地生物-有机地球化学记录的干旱化研究 项目
项目编号:41831176; 经费:3020000(CNY); 起止日期:2019 / dc_date_end
项目负责人:  王永莉
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27
松软煤层钻进钻杆传力特性与煤体动力波动辨识 项目
项目编号:41872188; 经费:660000(CNY); 起止日期:2019 / dc_date_end
项目负责人:  王永龙
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
对虾AHPND致病性弧菌毒力基因pirAB及其载体质粒的水平传播机制与进化关系研究 项目
项目编号:41876195; 经费:620000(CNY); 起止日期:2019 / dc_date_end
项目负责人:  王永杰
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/27
Linking Stochasticity of Convection to Large-Scale Vertical Velocity to Improve Indian Summer Monsoon Simulation in the NCAR CAM5 期刊论文
JOURNAL OF CLIMATE, 2018, 31 (17) : 6985-7002
作者:  Wang, Yong;  Zhang, Guang J.;  Jiang, Yiquan
收藏  |  浏览/下载:20/0  |  提交时间:2019/04/09
Monsoons  Climate models  Clouds  Convective parameterization