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588 results on '"ZHANG Jiqiang"'

67. A generative hypergraph model for double heterogeneity.

Author

Li, Zhao, Zhang, Jing, Zheng, Guozhong, Chen, Li, Zhang, Jiqiang, and Cai, Weiran

Subjects
HETEROGENEITY, COMPUTER simulation, HYPERGRAPHS
Abstract

While network science has become an indispensable tool for studying complex systems, the conventional use of pairwise links often shows limitations in describing high-order interactions properly. Hypergraphs, where each edge can connect more than two nodes, have thus become a new paradigm in network science. Yet, we are still in lack of models linking network growth and hyperedge expansion, both of which are commonly observable in the real world. Here, we propose a generative hypergraph model by employing the preferential attachment mechanism in both nodes and hyperedge formation. The model can produce bi-heterogeneity, exhibiting scale-free distributions in both hyperdegree and hyperedge size. We provide a mean-field treatment that gives the expression of the two scaling exponents, which agree with the numerical simulations. Our model may help to understand the networked systems showing both types of heterogeneity and facilitate the study of complex dynamics thereon. [ABSTRACT FROM AUTHOR]

Published
2024
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90. Development overview of paste backfill technology in China’s coal mines: a review

Author

Ke Yang, Zhen Wei, Zhang Jiqiang, and Zhao Xinyuan

Subjects
Engineering, Mining engineering, business.industry, Health, Toxicology and Mutagenesis, Technology system, Coal mining, Environmental Chemistry, Coal, General Medicine, business, Pollution
Abstract

After years of development, paste backfill technology has become an important part of China’s green safety mine construction and coal green mining technology system in the new era. In this paper, the research status of paste backfill technology in China’s coal mines is expounded from the aspects of paste backfill materials, strata control theory, and paste backfill technological process. Based on the statistics of the distribution number of coal mines adopting paste backfill technology, several typical paste backfill mines are listed, and the parameters of backfill panel, geological conditions, and paste backfill effect are analyzed, the general conditions of applying paste backfill technology in coal mines are summarized. Finally, some problems in the application of paste backfill technology are pointed out, and the future development of backfill mining is prospected from the research and development of backfill materials, deep underground backfill mining, intelligent paste backfill, and other aspects. This paper provides a reference for a comprehensive and in-depth understanding of the current development status of paste backfill technology in China.

Published
2021

91. Mechanical properties and instability analysis of concrete specimens with horizontal holes of different diameters

Author

Fang, Juejing, Yang, Ke, Lyu, Xin, Tang, Jinzhou, and Zhang, Jiqiang

Subjects
General Earth and Planetary Sciences
Abstract

Uniaxial compression tests were carried on 12 concrete specimens with six different diameter holes using a rigid test machine, and the stress–strain relationship was analyzed in different hole diameter specimens. The effects of different hole diameters on specimen compression strength, elastic modulus, and Poisson’s ratio were studied, and the failure form and instability mode of concrete specimens with holes of different diameters were evaluated. The results show that the larger the compression strength of the specimen, the larger the axial and horizontal strains. As the hole diameter increased from 0 to 50 mm, the compression strength and elastic modulus reduced. The decreasing trend slowed down, and the relationships between the hole diameter and compression strength, and elastic modulus could be represented by negative liner functions. The Poisson ratio of the specimen increased in waves with the increase in hole diameter from 0 to 50 mm. A crack in the concrete specimen with 0–20 mm diameter hole started at the upper and lower diagonal angles of the hole wall; a crack in the concrete specimen with 30–50 mm diameter hole started at the left and right parts of the hole wall. The instability mode of concrete specimens with horizontal holes of different diameters was divided into shear dislocation instability and planar splitting instability.

Published
2022

94. Accumulation of Co, Ni, Cu, Zn and Cd in Aboveground Organs of Chinese Winter Jujube from the Yellow River Delta, China

Author

Zhang, Zaiwang, primary, Zhang, Qiong, additional, Liu, Guoli, additional, Zhao, Jian, additional, Xie, Wenjun, additional, Shang, Shuai, additional, Luo, Jie, additional, Liu, Juanjuan, additional, Huang, Wenwen, additional, Li, Jialiang, additional, Zhang, Yanpeng, additional, Xu, Jikun, additional, and Zhang, Jiqiang, additional

Published
2022
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