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3,123 results on '"WANG An-hu"'

1. Time-frequency characteristics of acoustic-electric signals induced by coal fracture under uniaxial compression based on full-waveform

Author

LOU Quan, HE Xue-qiu, SONG Da-zhao, LI Zhen-lei, WANG An-hu, and SUN Ran

Subjects
coal fracture, full-waveform, acoustic emission, electromagnetic radiation, time-frequency characteristics, Mining engineering. Metallurgy, TN1-997, Environmental engineering, TA170-171
Abstract

The geological conditions of coal mines in China are complicated. In recent years, with the continuous increase of intensity and depth of coal mining, coal and rock dynamic disasters are becoming more and more serious, and an important factor threatening the safety of coal mining. The accurate monitoring and early warning of coal and rock dynamic disasters are of great significance for disaster prevention. A large number of experiments conducted on both laboratory and field scales have demonstrated that the energy accumulated in rock material under loading can be released in the forms of acoustic emission (AE), electromagnetic radiation (EMR), etc. Therefore, AE and EMR, as the real-time, dynamic and continuous geophysical monitoring methods, have been widely used and played important roles in the field of monitoring and early-warning of coal and rock dynamic disasters in mines. To further study the time-frequency characteristics of AE and EMR and the relationships between these characteristics and load, and to provide the experimental basis for the monitoring and early warning of coal and rock dynamic disasters, an acoustic-electric full-waveform synchronous acquisition system of coal and rock fracture under loading was constructed in this paper. Using this system, the full-waveforms of AE and EMR of failure processes of coal samples under uniaxial compression were collected. The correlations among AE energy, EMR energy and load drop were studied, and the spectral characteristics of AE and EMR were analyzed. The results show that, (1) obvious acoustic-electric signals are emitted during the process of coal failure under loading. EMR is the paroxysmal signal, only accompanied by load drop and higher intensity AE. (2) Compared with AE, EMR has a higher correlation with load drop. There are high positive correlations among the cumulative values, relating to the cumulative released energy of coal fracture under loading, of AE energy, EMR energy and load drop. (3) The superiority frequency band of EMR is narrower than that of AE, with the former mainly concentrated in 1-25 kHz and the latter mainly in 1-280 kHz. Influenced by the initiation and propagation of the same crack, AE and EMR have similar low frequency components in the spectrum and main-frequency distribution.

Published
2019
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23. Probing Top-philic New Physics via Four-Top-Quark Production

Author

Cao, Qing-Hong, Fu, Jun-Ning, Liu, Yandong, Wang, Xiao-Hu, and Zhang, Rui

Subjects
High Energy Physics - Phenomenology
Abstract

We explore constraints on various new physics resonances from four top-quark production based on current experimental data. Both light and heavy resonances are studied in the work. A comparison of full width effect and narrow width approximation is also made., Comment: 7 pages, 10 figures; published version of Chinese Physics C; English typo corrected

Published
2021
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24. Key Technology Research of VR-Based Substation Practice Teaching System

Author

Wang, Da-Hu, Han, Guo-Chen, Fan, Zhen-Zhen, Gong, Zhi-Peng, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Jia, Yingmin, editor, Zhang, Weicun, editor, Fu, Yongling, editor, and Wang, Jiqiang, editor

Published
2023
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35. Discrete effect on the anti-bounce-back boundary condition of lattice Bhatnagar-Gross-Krook model for convection-diffusion equations

Author

Wang, Liang, Meng, Xuhui, Wu, Hao-Chi, Wang, Tian-Hu, and Lu, Gui

Subjects
Physics - Computational Physics, Physics - Fluid Dynamics
Abstract

The discrete effect on the boundary condition has been a fundamental topic for the lattice Boltzmann method in simulating heat and mass transfer problems. In previous works based on the halfway anti-bounce-back (ABB) boundary condition for convection-diffusion equations (CDEs), it is reported that the discrete effect cannot be commonly removed in the Bhatnagar-Gross-Krook (BGK) model except for a special value of relaxation time. Targeting this point in the present paper, we still proceed within the framework of BGK model for two-dimensional CDEs, and analyze the discrete effect on a non-halfway ABB boundary condition which incorporates the effect of the distance ratio. By analyzing an unidirectional diffusion problem with a parabolic distribution, the theoretical derivations with three different discrete velocity models show that the numerical slip is a combined function of the relaxation time and the distance ratio. Different from previous works, we definitely find that the relaxation time can be freely adjusted by the distance ratio in a proper range to eliminate the numerical slip. Some numerical simulations are carried out to validate the theoretical derivations, and the numerical results for the cases of straight and curved boundaries confirm our theoretical analysis. Finally, it should be noted that the present analysis can be extended from the BGK model to other lattice Boltzmann (LB) collision models for CDEs, which can broaden the parameter range of the relaxation time to approach 0.5., Comment: 23 pages, 12 figures

Published
2019
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37. Liver-resident NK cells suppress autoimmune cholangitis and limit the proliferation of CD4+ T cells

Author

Zhao, Zhi-Bin, Lu, Fang-Ting, Ma, Hong-Di, Wang, Yin-Hu, Yang, Wei, Long, Jie, Miao, Qi, Zhang, Weici, Tian, Zhigang, Ridgway, William M, Cao, Jie, Gershwin, M Eric, and Lian, Zhe-Xiong

Subjects
Biomedical and Clinical Sciences, Immunology, Liver Disease, Biotechnology, Autoimmune Disease, Chronic Liver Disease and Cirrhosis, Digestive Diseases, Aetiology, 2.1 Biological and endogenous factors, Oral and gastrointestinal, Inflammatory and immune system, Adoptive Transfer, Animals, Autoimmune Diseases, B-Lymphocytes, Basic-Leucine Zipper Transcription Factors, CD4-Positive T-Lymphocytes, CD8-Positive T-Lymphocytes, Cytokines, Disease Models, Animal, Disease Progression, Female, Hybridomas, Killer Cells, Natural, Liver, Liver Cirrhosis, Biliary, Male, Mice, Mice, Inbred C57BL, Mice, Knockout, Receptor, Transforming Growth Factor-beta Type II, Liver-resident NK, Cholangitis, CD4(+) T cell, Suppression, CD4+ T cell, Biochemistry and Cell Biology
Abstract

Liver-resident NK cells are distinct from conventional NK cells and play an important role in the maintenance of liver homeostasis. How liver-resident NK cells participate in autoimmune cholangitis remains unclear. Here, we extensively investigated the impact of NK cells in the pathogenesis of autoimmune cholangitis utilizing the well-established dnTGFβRII cholangitis model, NK cell-deficient (Nfil3-/-) mice, adoptive transfer and in vivo antibody-mediated NK cell depletion. Our data demonstrated that disease progression was associated with a significantly reduced frequency of hepatic NK cells. Depletion of NK cells resulted in exacerbated autoimmune cholangitis in dnTGFβRII mice. We further confirmed that the DX5-CD11chi liver-resident NK cell subset colocalized with CD4+ T cells and inhibited CD4+ T cell proliferation. Gene expression microarray analysis demonstrated that liver-resident NK cells had a distinct gene expression pattern consisting of the increased expression of genes involved in negative regulatory functions in the context of the inflammatory microenvironment.

Published
2020

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