15 results on '"Zhongbei Li"'
Search Results
2. Insight into proactive inertisation strategies for spontaneous combustion management during longwall mining of coal seams with various orientations
- Author
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Ming Qiao, Ting Ren, Jon Roberts, Xiaohan Yang, Zhongbei Li, and Jianming Wu
- Subjects
Fuel Technology ,Nuclear Energy and Engineering ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology - Published
- 2023
3. New insight into proactive goaf inertisation for spontaneous combustion management and control
- Author
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Ming Qiao, Ting Ren, Jon Roberts, Xiaohan Yang, Zhongbei Li, and Jianming Wu
- Subjects
Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2022
4. The Influence of Fused Deposition Modeling Parameters on the Properties of PA6/PA66 Composite Specimens by the Taguchi Method and Analysis of Variance
- Author
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Zhongbei Li, Youcai Liu, Zihai Liang, and Yaochi Liu
- Subjects
Materials Science (miscellaneous) ,Industrial and Manufacturing Engineering - Published
- 2023
5. Full-scale pore structure characterization of different rank coals and its impact on gas adsorption capacity: A theoretical model and experimental study
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Zhongbei Li, Ting Ren, Xiangchun Li, Yuanping Cheng, Xueqiu He, Jia Lin, Ming Qiao, and Xiaohan Yang
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General Energy ,Mechanical Engineering ,Building and Construction ,Electrical and Electronic Engineering ,Pollution ,Industrial and Manufacturing Engineering ,Civil and Structural Engineering - Published
- 2023
6. Gas seepage characteristics of loaded coal under negative suction pressure
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Zhongbei Li, Li Xiangchun, Gao Jiaxing, Qi Zhang, Fan Zhang, and Lei Xie
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Materials science ,Correlation coefficient ,020209 energy ,Effective stress ,02 engineering and technology ,Loaded coal ,complex mixtures ,Permeability ,Negative suction pressure ,Stress (mechanics) ,020401 chemical engineering ,otorhinolaryngologic diseases ,0202 electrical engineering, electronic engineering, information engineering ,Coal ,0204 chemical engineering ,Composite material ,skin and connective tissue diseases ,Porosity ,Deformation (mechanics) ,business.industry ,technology, industry, and agriculture ,TK1-9971 ,Permeability (earth sciences) ,General Energy ,Gas seepage ,Electrical engineering. Electronics. Nuclear engineering ,sense organs ,business ,Porous medium - Abstract
ANSYS was used in this study to simulate the change in permeability of loaded coal under negative pressure. The ANSYS transient structural module was employed to simulate the coal loading conditions and to calculate the coal volumetric strain and coal porosity change. In the ANSYS Fluent module, the porosity of the porous medium was changed to replace the coal deformation, and the outlet pressure was changed to simulate the change of negative pressure. By using 1stOpt software, the relationships among the negative pressure, effective stress, and permeability of coal were fitted, and the binary nonlinear function of permeability varying with effective stress and negative pressure was obtained, and the correlation coefficient was excellent. Results showed that the coal permeability had a negative exponential relationship with effective stress. Hence, the permeability decreased with the increase of the effective stress. The change in stress loading mode caused a sudden change in porosity and permeability. The coal permeability had an approximately linear relationship with negative pressure. Hence, permeability increased with an increase in negative pressure. However, with the increase of effective stress, the influence of negative pressure on coal permeability was gradually weakened.
- Published
- 2021
7. Mechanism and Classification of Coal and Gas Outbursts in China
- Author
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Qi Zhang, Yi Li, Chun-li Yang, Zhongbei Li, and Li Xiangchun
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Astrophysics::High Energy Astrophysical Phenomena ,Seepage field ,0211 other engineering and technologies ,02 engineering and technology ,010502 geochemistry & geophysics ,complex mixtures ,01 natural sciences ,Mining engineering ,otorhinolaryngologic diseases ,Coal ,021108 energy ,Short duration ,Physics::Atmospheric and Oceanic Physics ,0105 earth and related environmental sciences ,Civil and Structural Engineering ,business.industry ,Single factor ,In situ stress ,Engineering (General). Civil engineering (General) ,respiratory tract diseases ,Gas pressure ,Environmental science ,TA1-2040 ,Experimental methods ,business ,Mechanism (sociology) - Abstract
Coal and gas outburst is a kind of complex dynamic disaster with short duration and strong explosiveness, and the modes and strength of the outburst are determined by the in situ stress, gas pressure, and physical and mechanical properties of the coal mass. In this paper, the status quo of research on the mechanism of coal and gas outburst in China is described from three aspects: the controlling effect of single factor, the controlling effect of multi-factor, and new understandings of the outburst mechanism in recent years. Firstly, controlling factors of coal and gas outburst are classified for an in-depth analysis of the main factors of the same type of disasters, and the research progress and new understandings of the mechanism of coal and gas outburst are systematically sorted out. Secondly, the influencing factors of the strength coal mass are analyzed, and the related issues of coal mass strength on coal and gas outburst disaster mechanism are discussed. The results show that the stages of incubation, occurrence, development, and stop on coal and gas outburst are affected by the coupling effects of in situ stress field, gas pressure field, and seepage field, and the coal strength becomes an important factor affecting outburst strength under the same in situ stress and gas pressure. Therefore, the scientific and reasonable improvement methods of such similar simulation experiment devices are proposed according to the existing experimental methods and devices, which is of great significance to provide ideas for the continuous transferring to deep mining and preventing coal and gas outburst in China in the future.
- Published
- 2021
8. Epigenetic Regulation in Urothelial Carcinoma
- Author
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Yuan Li, Ke Li, Lin Qi, Guyu Tang, Haozhe Xu, Zhi Li, Bo Fan, and Zhongbei Li
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Molecular Medicine ,General Medicine ,Molecular Biology ,Biochemistry - Abstract
Abstract: Urothelial carcinoma (UC) is a common malignancy that remains a clinical challenge: Non-muscle-invasive urothelial carcinoma (NMIUC) has a high rate of recurrence and risk of progression, while muscle-invasive urothelial carcinoma (MIUC) has a high mortality. Although some new treatments, such as immunotherapies, have shown potential effects on some patients, most cases of advanced UC remain incurable. While treatments based on epigenetic mechanisms, whether combined with traditional platinum-based chemotherapy or emerging immunotherapy, show therapeutic advantages. With the advancement of sequencing and bioinformatics, the study of epigenomics, containing DNA methylation, histone modifications, chromatin remodeling, and non-coding RNA, is increasingly linked with the occurrence and progression of UC. Since the epigenetics of UC is a constantly developing field of medicine, this review aims to summarize the latest research on epigenetic regulation of UC, generalize the mechanism of epigenetics in UC, and reveal the potential epigenetic therapies in the clinical setting, in order to provide some new clues on the discovery of new drugs based on the epigenetics.
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- 2022
9. Corrigendum to 'New insight into proactive goaf inertisation for spontaneous combustion management and control' Process Saf. Environ. Prot., vol 161 (May 2022) 739–757
- Author
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Ming Qiao, Ting Ren, Jon Roberts, Xiaohan Yang, Zhongbei Li, and Jianming Wu
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Environmental Engineering ,General Chemical Engineering ,Environmental Chemistry ,Safety, Risk, Reliability and Quality - Published
- 2022
10. Mechanical Heterogeneity Characterization of Coal Materials Based on the Nano-Indentation Experiment
- Author
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Qi Zhang, Xiangchun Li, Zhongbei Li, Yaoyu Shi, Junqing Meng, Baisheng Nie, and Weidong Lu
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2021
11. Nanopore Structure of Different Rank Coals and Its Quantitative Characterization
- Author
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Fan Zhang, Meng Yangyang, Zhongbei Li, Baisheng Nie, Li Xiangchun, and Qi Zhang
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Materials science ,Small-angle X-ray scattering ,business.industry ,020209 energy ,Biomedical Engineering ,Analytical chemistry ,Bioengineering ,02 engineering and technology ,General Chemistry ,Condensed Matter Physics ,Nanopore ,Adsorption ,020401 chemical engineering ,Volume (thermodynamics) ,Desorption ,Specific surface area ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Coal ,0204 chemical engineering ,Absorption (chemistry) ,business - Abstract
Based on gas adsorption theory, high-pressure mercury intrusion (HPMI), low-temperature liquid nitrogen gas adsorption (LT-N2GA), CO2 adsorption, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and small-angle X-ray scattering (SAXS) techniques were used to analyze the pore structures of six coal samples with different metamorphisms in terms of pore volume, specific surface area (SSA), pore size distribution (PSD) and pore shape. Combined with the gas adsorption constant a, the influence and mechanism of the pore structure of different coal ranks on gas adsorption capacity were analyzed. The results show that there are obvious differences in the pore structure of coals with different ranks, which leads to different adsorption capacities. To a large extent, the pore shapes observed by SEM are consistent with the LT-N2GA isotherm analysis. The pore morphology of coal samples with different ranks is very different, indicating the heterogeneity among the coal surfaces. Adsorption analysis revealed that mesopore size distributions are multimodal and that the pore volume is mainly composed of mesopores of 2–15 nm. The adsorption capacity of the coal body micropores depends on the 0.6–0.9 nm and 1.5–2.0 nm aperture sections. The influence of coal rank on gas desorption and diffusion is mainly related to the difference in pore structure. The medium metamorphic coal sample spectra show that the number of peaks in the high-wavenumber segment is small and that it is greater in the high metamorphic coal. The absorption intensity of the C–H stretching vibration peak of naphthenic or aliphatic hydrocarbons varies significantly among the coal samples. Over a small range of angles, as the scattering angle increases, the scattering intensity of each coal sample gradually decreases, and as the degree of metamorphism increases, the scattering intensity gradually increases. That is, the degree of metamorphism of coal samples is directly proportional to the scattering intensity. The influence of coal rank on gas adsorption capacity is mainly related to the difference in pore structure. The gas adsorption capacity shows an asymmetric U-shaped relationship with coal rank. For higher rank coals (Vdaf < 15%), the gas adsorption consistently decreases significantly with increasing Vdaf. In the middle and low rank coal stages (Vdaf > 15%), it increases slowly with the increase of Vdaf. We believe that the results of this study will provide a theoretical basis and practical reference value for effectively evaluating coal-rock gas storage capacity, revealing the law of CBM enrichment and the development and utilization of CBM resources.
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- 2020
12. Nanopore Characteristics of Coal and Quantitative Analysis of Closed Holes in Coal
- Author
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Tao Yang, Xiaolong Chen, Fan Zhang, Qi Zhang, Li Xiangchun, Baisheng Nie, and Zhongbei Li
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Materials science ,business.industry ,General Chemical Engineering ,technology, industry, and agriculture ,General Chemistry ,Microporous material ,respiratory system ,complex mixtures ,respiratory tract diseases ,chemistry.chemical_compound ,Chemistry ,Adsorption ,chemistry ,Chemical engineering ,Volume (thermodynamics) ,Specific surface area ,Carbon dioxide ,Volume fraction ,otorhinolaryngologic diseases ,Coal ,Mesoporous material ,business ,QD1-999 - Abstract
Methane gas is mainly present in coal in two forms: free and adsorbed. There are a large number of closed pores inside the coal, which makes it difficult to measure the gas content of the coal. Therefore, studying the nanoscale closed pores of coal is of great importance for gas control. To study the pore structure characteristics of coal with different deformation degrees and to analyze the volume fraction of closed pores in coal, various coal samples were analyzed by the low-temperature liquid nitrogen adsorption method (LT-N2GA), the carbon dioxide adsorption method, and small-angle X-ray scattering (SAXS). The variation of parameters such as the pore size, pore volume, specific surface area, and degree of metamorphism was compared by using different methods to obtain the proportion of the closed pore volume of different coal samples. The results show that with the increase of the degree of coal metamorphism, the total pore volume and specific surface area of coal samples show a decreasing trend first and then an increasing trend, while the average pore diameter of coal samples gradually increases first and then decreases sharply. When the degree of deterioration of coal is low (volatile content > 20%), the closed pores of coal account for more than 48% of the open pores. When the degree of deterioration of coal samples is relatively high (volatile content
- Published
- 2020
13. Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal
- Author
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Li Xiangchun, Nie Baisheng, Ting Ren, Ying Jiang, Zhongbei Li, Sheng Bai, Tao Huang, and Lei Xie
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Materials science ,010504 meteorology & atmospheric sciences ,Diffusion ,Thermodynamics ,010502 geochemistry & geophysics ,01 natural sciences ,Isothermal process ,Adsorption ,Diffusion process ,Phase (matter) ,Desorption ,General Earth and Planetary Sciences ,Gaseous diffusion ,Particle size ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
A self-developed gas desorption and diffusion experimental system was used to conduct isothermal methane gas desorption and diffusion experiments, and the pore structure of coal samples was analyzed. A new mathematical model for gas diffusion in coal particles was established, and the diffusion coefficient was calculated using the new model. The influences of particle size and the adsorption equilibrium pressure on the methane gas diffusion rate, gas diffusion quantity, and diffusion coefficient were analyzed and discussed. The results show that under different adsorption equilibrium pressures and different particle sizes, the diffusion rate and quantity vary substantially. The larger the particle size, the slower the initial gas diffusion rate and the longer the time required to reach desorption equilibrium. The larger the adsorption pressure, the greater the initial gas diffusion rate and the larger the quantity of diffusion gas accumulated. However, the coal particle size has little influence on the amount of gas diffusion. It was found that as the particle size decreases, the diffusion coefficient in the first diffusion phase is significantly reduced, which decays with a negative exponential function over time. However, the adsorption equilibrium pressure has no obvious influence on the diffusion coefficient. In addition, the methane gas diffusion process was divided into three phases, namely, phase I, rapid diffusion phase (0–10 min); phase II, slow diffusion phase (10–100 min); and phase III, smooth diffusion phase (100 min); and the diffusion mechanism corresponding to each phase was analyzed. These research results provide a theoretical and practical reference value for gas prevention and control in coal mines.
- Published
- 2019
14. Quantitative Analysis of Global Terrorist Attacks Based on the Global Terrorism Database
- Author
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Fan Zhang, Qi Zhang, Zhongbei Li, Li Xiangchun, Fanfan Guo, and Chen Dong
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Geography, Planning and Development ,0211 other engineering and technologies ,TJ807-830 ,Analytic hierarchy process ,02 engineering and technology ,Management, Monitoring, Policy and Law ,TD194-195 ,computer.software_genre ,Renewable energy sources ,spatiotemporal evolution ,terrorist attacks ,Political science ,050602 political science & public administration ,GE1-350 ,analytic hierarchy process ,021110 strategic, defence & security studies ,Government ,quantitative analysis ,Environmental effects of industries and plants ,Database ,Emergency management ,Renewable Energy, Sustainability and the Environment ,business.industry ,05 social sciences ,International community ,Hazard ,0506 political science ,Environmental sciences ,Quantitative analysis (finance) ,Global terrorism ,global terrorism database ,Terrorism ,K-means cluster analysis ,business ,computer - Abstract
Terrorist attacks have become a serious source of risk affecting the security of the international community. Using the Global Terrorism Database (GTD), in order to quantitatively study past terrorist attacks and their temporal and spatial evolution the analytic hierarchy process (AHP) was used to classify the degree of damage from terrorist attacks. The various factors influencing terrorist attacks were extracted and represented in three dimensions. Subsequently, using MATLAB for analysis and processing, the grading standards for terrorist attacks were classified into five levels according to the degree of hazard. Based on this grading standard, the top ten terrorist attacks with the highest degree of hazard in the past two decades were listed. Because the characteristics and habits of a terrorist or group exhibit a certain consistency, the K-means cluster analysis method was used to classify terrorists according to region, type of attack, type of target and type of weapon used by the terrorists. Several attacks that might have been committed by the same terrorist organization or individual at different times and in different locations were classified into one category, and the top five categories were selected according to the degree of sabotage inflicted by the organization or individual. Finally, the spatiotemporal evolution of terrorist attacks in the past three years was analyzed, considering the terrorist attack targets and key areas of terrorist attacks. The Middle East, Southeast Asia, Central Asia, and Africa were predicted to be the regions that will be most seriously affected by future global terrorist events. The terrorist attacks in Southeast Asia are expected to become more severe, and the scope of terrorist attacks in Africa is expected to widen. Civilians are the targets most at risk for terrorist attacks, and the corresponding risk index is considerably higher than it is for other targets. The results of this research can help individuals and the government to enable a better understanding of terrorism, improve awareness to prevent terrorism and enhance emergency management and rescue, and provide a solid and reliable basis and reference for joint counterterrorism in various countries and regions.
- Published
- 2021
15. Research on evaluation of safety literacy based on social network analysis
- Author
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Yunlong Zhu, Xiangchun Li, Zhongbei Li, Qin Li, Rong Liu, and Yuzhen Long
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Knowledge management ,business.industry ,General Chemical Engineering ,media_common.quotation_subject ,Social network analysis (criminology) ,Sociology ,Safety, Risk, Reliability and Quality ,business ,Literacy ,media_common - Published
- 2019
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