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| 1 | Directional hydraulic fracturing to control hard-roof rockburst in coal mines显示文摘Hard roof is the main factor that induces rock-burst.In view of the present obvious weakness of control measures for hard roof rockburst in domestic collieries,the mechanism and field application of directional hydraulic fracturing technology for rock-burst prevention have been investigated in this paper using theoretical analysis and numerical simulation.The results show that the weighting span of the main roof and the released kinetic energy as well as the total elastic energy decreased greatly after the directional fracturing of hard roof with the mining progression,thereby reducing the rockburst hazard degree to coal body.The directional hydraulic fracturing technology was carried out in 6305 working face of Jisan Coal Mine to prevent rockburst.Field practices have proved that this technology is much simpler and safer to operate with better prevention effect compared with blasting.By optimizing the operation procedures and developing a new technology of automated high-pressure delivery pipe,the maximum fracturing radius now reaches more than 9 m and the borehole depth exceeds 20 m.Additionally,drilling cutting method was applied to monitor the stress of the coal mass before and after the fracturing,and the drill cuttings dropped significantly which indicates that the burst prevention effect of directional hydraulic fracturing technology is very remarkable.The research results of this paper have laid a theoretical and practical foundation for the widespread application of the directional hydraulic fracturing technology in China. | Fan Jun Dou Linming He Hu Du Taotao Zhang Shibin Gui Bing Sun Xinglin | 2012 | International Journal of Mining Science and Technology2012，22，2： | 28 |
| 2 | Deep-hole directional fracturing of thick hard roof for rockburst prevention显示文摘 | Hu He Linming Dou Jun Fan Taotao Du Xinglin Sun | 2012 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2012，，： | 2 |
| 3 | Fluid-driven seismicity in relatively stable continental regions:Insights from the February 3^(rd),2020 M_(S)5.1 Qingbaijiang isolated earthquake显示文摘On February 3rd,2020,an isolated MS5.1 earthquake occurred in the northern section of the Longquanshan fault zone.This study aims at defining the geometry of seismogenic structures of this earthquake.In detail,centroid moment tensor inversion results show that the earthquake is characterized by a focal depth of 3.8 km with no corresponding surface faults.The strike/dip/rake angles for the two nodal planes are 205°/54°/96°and 15°/36°/82°,respectively.With the analyses of coseismic deformation of the surface obtained from InSAR measurements,together with the information of relocated hypocenters for a small number of aftershocks,it is concluded that a northwest-dipping nodal plane corresponds well to the source fault.The fault is suggested to have a length of about 2.8 km and a depth range of 2-5 km,and the centroid of the earthquake is located at 104.48°E and 30.71°N.Furthermore,multiple pieces of evidence indicate that this earthquake is partly driven by the overpressure effect associated with the adjacent natural gas packets,which is similar to several other moderate natural earthquakes in Sichuan Basin. | Xinglin Lei Jianbao Sun Jinrong Su | 2021 | Earthquake Research Advances2021，1，1： | 2 |
| 4 | Ultrasonic Welding of Magnesium–Titanium Dissimilar Metals:A Study on Thermo-mechanical Analyses of Welding Process by Experimentation and Finite Element Method显示文摘Ultrasonic welding is an effective ways to achieve a non-reactive/immiscible heterogeneous metal connection, such as the connection of magnesium alloy and titanium alloy. But the thermal mechanism of magnesium alloy/titanium alloy ultrasonic welding has not been defined clearly. In this paper, the experimental and the finite element analysis were adopted to study the thermal mechanism during welding. Through the test, the temperature variation law during the welding process is obtained, and the accuracy of the finite element model is verified. The microscopic analysis indicates that at the welding time of 0.5 s, the magnesium alloy in the center of the solder joint is partially melted and generates the liquid phase. Through the finite element analysis, the friction coefficient of the magnesium–titanium ultrasonic welding interface can be considered as an average constant value of 0.28. The maximum temperature at the interface can exceed 600 ℃ to reach the melting point temperature of the magnesium alloy. The plastic deformation begins after 0.35 s and occurs at the magnesium side at the center of the interface. | Dewang Zhao Daxin Ren Kunmin Zhao Pan Sun Xinglin Guo Liming Liu | 2019 | Chinese Journal of Mechanical Engineering2019，32，6： | 2 |
| 5 | Correlated spatio-temporal data collection in wireless sensor networks based on low rank matrix approximation and optimized node sampling 显示文摘 | Piao Xinglin Hu Yongli Sun Yanfeng | 2014 | Sensors2014，14，23： | 1 |
| 6 | Incidence and Risk Factors of the Upper-Limb Musculoskeletal Disorders Among Occupational Groups in Key Industries—China,2018–2021显示文摘What is already known about this topic?The burden of illness and economic losses due to upper-limb work-related musculoskeletal disorders(UL-WMSDs)is high;thus,they have become a major global public health problem.At present,the epidemiological characteristics of UL-WMSDs in China's occupational population are still unknown.What is added by this report?The incidence of UL-WMSDs among key occupational groups in China is 22.5%,with distinct occupational characteristics.What are the implications for public health practice?This study has primarily determined the occurrence and potential risk factors of UL-WMSDs in key industries in China and provided data support for recommending prevention and control of the occurrence of such diseases in key industries in China,and in facilitating the addition into the China’s List of Legal Occupational Diseases. | Ning Jia Meibian Zhang Huadong Zhang Ruijie Ling Yimin Liu Gang Li Yan Yin Hua Shao Hengdong Zhang Bing Qiu Dongxia Li Dayu Wang Qiang Zeng Rugang Wang Jianchao Chen Danying Zhang Liangying Mei Xinglin Fang Yongquan Liu Jixiang Liu Chengyun Zhang Tianlai Li Jun Qi Qing Xu Ying Qu Xueyan Zhang Xin Sun Zhongxu Wang | 2022 | China CDC weekly2022，4，50： | 1 |
| 7 | Chiral effect on Aβ fibrillation from molecular-scale to nanoscale显示文摘β-Amyloid(Aβ)peptide fibrillation,one of the characteristic hallmarks of Alzheimer’s disease,is determined by many interfacial physical-chemical factors,e.g.,charge,hydrophobicity,etc.Despite extensive research,chiral effect in different-scales on the fibrillation process of Aβremains unclear.Herein,molecular-scale,sub-nanoscale,and nanoscale chiral-structures were constructed to investigate their chiral effect on the fibrillation of Aβ_(40) peptides.Chiral structures from molecular-scale to nanoscale were obtained from the different periods of the chemosynthesis process of chiral ZnS quantum-dots(QDs),confirmed by real-time monitoring of circular dichroism spectra.For molecular-scale,both L-penicillamine(L-P)and D-P ligands accelerated the fibrillation of Aβ_(40),and the speed-up effect of D-P was slightly stronger than L-P.For sub-nanoscale,both two chiral Zncomplexes(L-Zn and D-Zn)induced the agglomeration of Aβ_(40) without chirality discrimination.For nanoscale,both L-ZnS and DZnS QDs inhibited the fibrillation of Aβ_(40),and the inhibition effect of L-ZnS was notably better than that of D-ZnS.In-situ kinetics experiments of Aβ_(40) co-incubated with two chiral QDs demonstrated that L-ZnS completely prevents the misfolding of Aβ_(40) from unfolded toβ-sheet,while D-ZnS cannot achieve this.Further site-replacement experiments and simulation results revealed the underlying molecular mechanisms of the different inhibition efficiency of chiral ZnS QDs on Aβ_(40) fibrillation,which mainly attribute to the stereoselectivity interaction between the chiral ligands of ZnS QDs and electro-positive amino acid residues(R5,K16,and K28)of Aβ_(40).This work offers a microscopic insight of chiral effect on Aβfibrillation exerted by structures in different-scales,and provides a guidance in precise regulation of protein fibrillation via manipulating chiral structures in different-scales. | Guanbin Gao Guowei Zhu Liangchong Yu Zijun Zhang Ting Zhang Xinglin Liu Cheng Zhang Lin Zhou Taolei Sun | 2022 | Nano Research2022，15，7： | 0 |
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