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Insight into pore-throat size distribution and the controls on oil saturation of tight sandstone reservoirs using nuclear magnetic resonance parameters: A case study of the Lower Cretaceous Quantou Formation in the southern Songliao Basin, China 期刊论文
AAPG Bulletin, 2020
作者:  Kelai Xi;  Yingchang Cao;  Ke Li;  Keyu Liu;  Rukai Zhu;  Beyene Girma Haile
收藏  |  浏览/下载:17/0  |  提交时间:2020/11/20
An operational statistical downscaling prediction model of the winter monthly temperature over China based on a multi-model ensemble 期刊论文
Atmospheric Research, 2020
作者:  Ying Liu, Ke Fan, Lijuan Chen, Hong-Li Ren, ... Changzheng Liu
收藏  |  浏览/下载:7/0  |  提交时间:2020/09/22
Co-variability of July precipitation between North China and the Kazakhstan-Xinjiang region and its precursory atmospheric signals 期刊论文
Atmospheric Research, 2020
作者:  Di Li, Ge Liu, Ren-Guang Wu, Ke-Jun He, ... Chang-Yan Zhou
收藏  |  浏览/下载:8/0  |  提交时间:2020/09/08
Global modeling of heterogeneous hydroxymethanesulfonate chemistry 期刊论文
Atmospheric Chemistry and Physics, 2020
作者:  Shaojie Song, Tao Ma, Yuzhong Zhang, Lu Shen, Pengfei Liu, Ke Li, Shixian Zhai, Haotian Zheng, Meng Gao, Fengkui Duan, Kebin He, and Michael B. McElroy
收藏  |  浏览/下载:20/0  |  提交时间:2020/08/09
Exploring the inconsistent variations in atmospheric primary and secondary pollutants during the 2016 G20 summit in Hangzhou, China: implications from observations and models 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (9) : 5391-5403
作者:  Zhang, Gen;  Xu, Honghui;  Wang, Hongli;  Xue, Likun;  He, Jianjun;  Xu, Wanyun;  Qi, Bing;  Du, Rongguang;  Liu, Chang;  Li, Zeyuan;  Gui, Ke;  Jiang, Wanting;  Liang, Linlin;  Yan, Yan;  Meng, Xiaoyan
收藏  |  浏览/下载:12/0  |  提交时间:2020/05/13
Engineering covalently bonded 2D layered materials by self-intercalation 期刊论文
NATURE, 2020, 581 (7807) : 171-+
作者:  Shang, Jian;  Ye, Gang;  Shi, Ke;  Wan, Yushun;  Luo, Chuming;  Aihara, Hideki;  Geng, Qibin;  Auerbach, Ashley;  Li, Fang
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/03

Two-dimensional (2D) materials(1-5) offer a unique platform from which to explore the physics of topology and many-body phenomena. New properties can be generated by filling the van der Waals gap of 2D materials with intercalants(6,7)  however, post-growth intercalation has usually been limited to alkali metals(8-10). Here we show that the self-intercalation of native atoms(11,12) into bilayer transition metal dichalcogenides during growth generates a class of ultrathin, covalently bonded materials, which we name ic-2D. The stoichiometry of these materials is defined by periodic occupancy patterns of the octahedral vacancy sites in the van der Waals gap, and their properties can be tuned by varying the coverage and the spatial arrangement of the filled sites(7,13). By performing growth under high metal chemical potential(14,15) we can access a range of tantalum-intercalated TaS(Se)(y), including 25% Ta-intercalated Ta9S16, 33.3% Ta-intercalated Ta7S12, 50% Ta-intercalated Ta10S16, 66.7% Ta-intercalated Ta8Se12 (which forms a Kagome lattice) and 100% Ta-intercalated Ta9Se12. Ferromagnetic order was detected in some of these intercalated phases. We also demonstrate that self-intercalated V11S16, In11Se16 and FexTey can be grown under metal-rich conditions. Our work establishes self-intercalation as an approach through which to grow a new class of 2D materials with stoichiometry- or composition-dependent properties.


  
2013-2019 increases of surface ozone pollution in China: anthropogenic and meteorological influences 期刊论文
Atmospheric Chemistry and Physics, 2020
作者:  Ke Li, Daniel J. Jacob, Lu Shen, Xiao Lu, Isabelle De Smedt, and Hong Liao
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
Laser spectroscopy of pionic helium atoms 期刊论文
NATURE, 2020, 581 (7806) : 37-+
作者:  Shang, Jian;  Ye, Gang;  Shi, Ke;  Wan, Yushun;  Luo, Chuming;  Aihara, Hideki;  Geng, Qibin;  Auerbach, Ashley;  Li, Fang
收藏  |  浏览/下载:20/0  |  提交时间:2020/07/03

Charged pions(1) are the lightest and longest-lived mesons. Mesonic atoms are formed when an orbital electron in an atom is replaced by a negatively charged meson. Laser spectroscopy of these atoms should permit the mass and other properties of the meson to be determined with high precision and could place upper limits on exotic forces involving mesons (as has been done in other experiments on antiprotons(2-9)). Determining the mass of the pi(-) meson in particular could help to place direct experimental constraints on the mass of the muon antineutrino(10-13). However, laser excitations of mesonic atoms have not been previously achieved because of the small number of atoms that can be synthesized and their typically short (less than one picosecond) lifetimes against absorption of the mesons into the nuclei(1). Metastable pionic helium (pi He-4(+)) is a hypothetical(14-16) three-body atom composed of a helium-4 nucleus, an electron and a pi(-) occupying a Rydberg state of large principal (n approximate to 16) and orbital angular momentum (l approximate to n - 1) quantum numbers. The pi He-4(+) atom is predicted to have an anomalously long nanosecond-scale lifetime, which could allow laser spectroscopy to be carried out(17). Its atomic structure is unique owing to the absence of hyperfine interactions(18,19) between the spin-0 pi(-) and the He-4 nucleus. Here we synthesize pi He-4(+) in a superfluid-helium target and excite the transition (n, l) = (17, 16) -> (17, 15) of the pi(-)-occupied pi He-4(+) orbital at a near-infrared resonance frequency of 183,760 gigahertz. The laser initiates electromagnetic cascade processes that end with the nucleus absorbing the pi(-) and undergoing fission(20,21). The detection of emerging neutron, proton and deuteron fragments signals the laser-induced resonance in the atom, thereby confirming the presence of pi He-4(+). This work enables the use of the experimental techniques of quantum optics to study a meson.


Long-lived pionic helium atoms (composed of a helium-4 nucleus, an electron and a negatively charged pion) are synthesized in a superfluid-helium target, as confirmed by laser spectroscopy involving the pion-occupied orbitals.


  
Temporal variation and long-range transport of gaseous elemental mercury (GEM) over a coastal site of East China 期刊论文
ATMOSPHERIC RESEARCH, 2020, 233
作者:  Yi, Hui;  Tong, Lei;  Lin, Jia-mei;  Cai, Qiu-liang;  Wang, Ke-qiang;  Dai, Xiao-rong;  Li, Jian-rong;  Chen, Jin-sheng;  Xiao, Hang
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/02
GEM  Temporal variation  K-means clustering  Backward trajectory  Concentration weighted trajectory (CWT)  
Effect of changing NOx lifetime on the seasonality and long-term trends of satellite-observed tropospheric NO2 columns over China 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (3) : 1483-1495
作者:  Shah, Viral;  Jacob, Daniel J.;  Li, Ke;  Silvern, Rachel F.;  Zhai, Shixian;  Liu, Mengyao;  Lin, Jintai;  Zhang, Qiang
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02