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1,028 results on '"Liu, Xuehua"'

151. Sodium Niobate with a Large Interlayer Spacing: A Fast‐Charging, Long‐Life, and Low‐Temperature Friendly Lithium‐Storage Material

Author

Gao, Jiazhe, primary, Yang, Liting, additional, Huang, Cihui, additional, Liang, Guisheng, additional, Lei, Yi, additional, Li, Songjie, additional, Wang, Wenze, additional, Ou, Yinjun, additional, Gao, Shangfu, additional, Liu, Xuehua, additional, Cheng, Yifeng, additional, Zhang, Jincang, additional, Liu, Zhongzhu, additional, Guo, Aiming, additional, Monteiro, Robson, additional, Parreira, Luanna, additional, Ribas, Rogerio, additional, Lin, Chunfu, additional, Wu, Limin, additional, and Che, Renchao, additional

Published
2023
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159. Carbon Nanofibers Decorated by MoS 2 Nanosheets with Tunable Quantity as Self-Supporting Anode for High-Performance Lithium Ion Batteries.

Author

Dang, Liyan, Yuan, Yapeng, Wang, Zongyu, Li, Haowei, Yang, Rui, Fu, Aiping, Liu, Xuehua, and Li, Hongliang

Subjects
LITHIUM-ion batteries, NANOSTRUCTURED materials, IONIC conductivity, NANOFIBERS, ELECTRIC conductivity, CARBON nanofibers, ANODES
Abstract

Two-dimensional molybdenum disulfide (MoS2) is considered as a highly promising anode material for lithium-ion batteries (LIBs) due to its unique layer structure, large plane spacing, and high theoretical specific capacity; however, the overlap of MoS2 nanosheets and inherently low electrical conductivity lead to rapid capacity decay, resulting in poor cycling stability and low multiplicative performance. This severely limits its practical application in LIBs. To overcome the above problems, composite fibers with a core//sheath structure have been designed and fabricated. The sheath moiety of MoS2 nanosheets is uniformly anchored by the hydrothermal treatment of the axial of carbon nanofibers derived from an electrospinning method (CNFs//MoS2). The quantity of the MoS2 nanosheets on the CNFs substrates can be tuned by controlling the amount of utilized thiourea precursor. The influence of the MoS2 nanosheets on the electrochemical properties of the composite fibers has been investigated. The synergistic effect between MoS2 and carbon nanofibers can enhance their electrical conductivity and ionic reversibility as an anode for LIBs. The composite fibers deliver a high reversible capacity of 866.5 mA h g−1 after 200 cycles at a current density of 0.5 A g−1 and maintain a capacity of 703.3 mA h g−1 after a long cycle of 500 charge–discharge processes at 1 A g−1. [ABSTRACT FROM AUTHOR]

Published
2023
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180. 3D deep electrical structure and seismogenic environment in the western section of the Zhangjiakou-Bohai fault zone

Author

Peng, Yuanqian, Sun, Xiangyu, Zhan, Yan, Zhao, Lingqiang, Luo, Quanxing, Liu, Xuehua, Ran, Zhijie, and Wang, Lisen

Subjects
General Earth and Planetary Sciences
Abstract

The Zhangjiakou-Bohai fault zone (ZBFZ) is an important NW-trending active tectonic zone in North China. The western section of ZBFZ is characterized by frequent moderate and strong earthquakes. This is a typical tectonic area for studying seismic and volcanic activities. The three-dimensional (3D) deep electrical structure of the region was revealed by using 3D electromagnetic inversion of 143 magnetotelluric stations. The results suggest that the deep electrical structure in the western part of the ZBFZ is laterally heterogeneous. To the north of the Shangyi-Chicheng Fault (F4), the upper crust has a high resistivity structure (R), corresponding to the exposed Hanuoba basalts and metamorphic rocks. To the south of F4, high and low resistivity zones alternate, which is attributed to the complex faults and basin-range structures. In the middle crust, the low-resistivity structures (C1 and C2) gradually appear in the northwest and southeast of the study area, showing the characteristics of a high-resistivity structure sandwiched between two low-resistivity structures. In the lower crust, the two low-resistivity structures (C1 and C2) gradually join each other and the whole region becomes characterized by low resistivity. The Shangyi-Chicheng Fault (F4), the northern margin fault of the Huai’an Basin (F7), and the northern margin fault of the Huaizhuo Basin (F11) are definite electrical difference zones, which are connected to a low-resistivity layer in the crust. The results indicate that the focal depth of the 1998 M6.2 Zhangbei earthquake was between 12 km and 15 km and its seismogenic fault was the Dahezhen-Hailiutu Fault (F3), which is concealed beneath the Hanuoba basalt area. It is speculated that owing to the neotectonic activities, the magma originated in the asthenosphere mantle rose and erupted on the surface near Datong, forming the Datong volcanic group. Then the magma continued to migrate and overflow along with the fractures in the NE direction, forming the Hannuoba basalts in the Zhangbei area. The existence of mantle thermal material in this area led to the migration of accompanying fluids to the middle and upper crust, resulting in fault sliding and frequent occurrence of moderate and strong earthquakes in this region.

Published
2022

191. Research on Threat Information Network Based on Link Prediction

Author

Jin Du, Yuan Feng, Liu Xuehua, Ding Liping, and Guangxuan Chen

Subjects
Computer science, Link (knot theory), Data science, Software
Abstract

The study of complex networks is to discover the characteristics of these connections and to discover the nature of the system between them. Link prediction method is a classic in the study of complex networks. It ca not only reflect the relationship between the node similarity. More can be estimated through the edge, which reveals the intrinsic factors of network evolution, namely the network evolution mechanism. Threat information network is the evolution and development of the network. The introduction of such a complex network of interdisciplinary approach is an innovative research perspective to observe that the threat intelligence occurs. The characteristics of the network show, at the same time, also can predict what will happen. The evolution of the network for network security situational awareness of the research provides a new approach.

Published
2021

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