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A review of the health effects and exposure-responsible relationship of diesel particulate matter for underground mines

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International Journal of Mining Science and Technology 2017年第5期27卷 831-838页

作者： Chang Ping xu guang Department of Mining Engineering and Metallurgical Engineering Western Australian School of MinesCurtin UniversityKalgoorlie 6430Australia

The increasing use of diesel-powered equipment in confined spaces(underground mines) has the potential to over expose underground miners under the threat of diesel particulate matter(DPM). Miners in underground mines can be exposed to DPM concentrations far more than works in other industries. A great number of animal and epidemiological studies have shown that both short-term and long-term DPM exposure have adverse health effect. Based on reviews of related studies, especially some recent evidence, this paper investigated the long and short-term health effects based on animal studies and epidemiological studies. The exposure-response relationship studies were also explored and compared to the current DPM regulation or standards in some countries. This paper found that the DPM health effect studies specifically for miners are not sufficient to draw solid conclusions, and a recommendation limit of DPM concentration can be put in place for better protection of miners from DPM health risk. Current animal studies lack the use of species that have similar lung functions as human for understanding the cancer mode of action in human. And finally, the DPM health hazard will continue to be a challenging topic before the mode of action and reliable exposure-response relationship are established.

关键词： Diesel particulate matter (DPM) Underground mines Lung cancer Exposure-response relationship

Electronic and magnetic structures of ternary iron telluride KF2T2

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Frontiers of physics 2015年第4期10卷 61-66页

作者： xu, xu-guang Li, Wei Chinese Academy of Sciences State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity Shanghai Institute of Microsystem and Information Technology Shanghai China (GRID:grid.9227.e) (ISNI:***)

We examine the electronic and magnetic structures of iron telluride KFe2Te2 using first-principle calculations. We demonstrate that the ground state of this compound is in bicollinear antiferromag- netic order with Fe local moments （- 2.6 μB） that are ferromagnetically aligned along a diagonal direction and antiferromagnetically aligned along the other diagonal in the Fe-Fe square lattice, sim- ilar to the alignment discovered in the parent compound of superconductor α-FeTe. This bicollinear antiferromagnetic order results from the interplay among the nearest, next-nearest, and next-next- nearest neighbor exchange interactions, which are mediated by Te 5p orbitals. This finding may aid our understanding of the interplay between magnetism and superconductivity in the family of iron-based materials.

关键词： iron-basel materials electronic and magnetic structures

Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions

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Nuclear Science and Techniques 2017年第2期28卷 70-98页

作者： Koichi Hattori xu-guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan University Shanghai 200433 China RIKEN-BNL Research Center Brookhaven National Laboratory Upton NY 11973-5000 USA Department of Physics Brookhaven National LaboratoryUpton NY 11973-5000 USA

The relativistic heavy-ion collisions create both hot quark–gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent years, it has been shown that such an interplay can generate a number of interesting quantum phenomena in hadronic and quark–gluon matter. In this short review, we first discuss some properties of the magnetic fields in heavy-ion collisions and then give an overview of the magnetic fieldinduced novel quantum effects. In particular, we focus on the magnetic effect on the heavy flavor mesons, the heavyquark transports, and the phenomena closely related to chiral anomaly.

关键词： Relativistic heavy-ion collisions Strong magnetic fields Anomalous transports Quarkonium Heavy quark diffusion dynamics

Spin polarization formula for Dirac fermions at local equilibrium

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 121-128页

作者： Yu-Chen Liu xu-guang Huang Physics Department and Center for Field Theory and Particle Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

We derive a Cooper-Frye type spin polarization formula for Dirac fermions at local thermal equilibrium described by a grand canonical ensemble specified by temperature, fluid velocity, chemical potential, and spin potential. We discuss the physical meaning of different contributions to spin polarization and compare them with previous work. The present formula provides machinery to convert the spin potential computed in, e.g., relativistic spin hydrodynamics to the spin polarization observable in,e.g., heavy-ion collisions.

关键词： spin polarization local equilibrium spin kinetic theory

Physical and computational study of a novel submerged entry nozzle design for twin-roll casting process

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Journal of Iron and Steel Research International 2021年第11期28卷 1390-1399页

作者： Mian-guang xu Miao-yong Zhu School of Mechanical Engineering Shandong University of TechnologyZibo 255000ShandongChina School of Metallurgy Northeastern UniversityShenyang 100819LiaoningChina

With significant emphasis on reducing the turbulence in the bath and the need for effective distribution of metal along the roller length in twin-roll casting,a novel submerged entry nozzle(SEN)configuration with two“gap regions”was ***“gap regions”of the new SEN divide the bath into two parts,the“upper melt bath”(casting region)and the“lower melt bath”(rolling region).The newly designed SEN was tested by using both full-scale water modeling experiments and numerical *** demonstrated that the turbulence could only be found near the rotating roller ***“gap regions”can make the near-wall flows more *** can also prevent the instabilities in the“upper melt bath”to be transferred to the“lower melt bath”,thus improving the stability of the ***,the novel SEN can stabilize the meniscus where the initial solidification *** is achieved by increasing the SEN immersion depth,which in turn,can enlarge the volume of the upper part of the bath.

关键词： Twin-roll casting Submerged entry nozzle Water model Numerical simulation

Numerical study on DPM dispersion and distribution in an underground development face based on dynamic mesh

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International Journal of Mining Science and Technology 2020年第4期30卷 471-475页

作者： Ping Chang guang xu Jinxin Huang WA School of Mines MineralsEnergy and Chemical EngineeringCurtin UniversityKalgoorlieWA 6430Australia Department of Mining Engineering Missouri University of Science and TechnologyRollaMO 65409USA

In 2012,the International Agency for Research on Cancer(IARC)classified diesel particulate matter(DPM)as a carcinogen to *** the increased usage of diesel equipment in underground mines,miners have a high risk of over-exposure to DPM,which has drawn many concerns from the *** study used computational fluid dynamics(CFD)to analyse the DPM dispersion and concentration distribution characteristics in an underground development face based on an onsite *** DPM emitted from a moving loader under a forcing auxiliary ventilation system was *** motion of the load-haul-dump(LHD)in the tunnel was represented by a dynamic mesh *** species transport approach was applied to study the DPM *** DPM concentration zones were then identified based on the simulation *** results could provide guidelines for work practices and be helpful to an optimum auxiliary ventilation design to reduce underground miner exposure.

关键词： Diesel particulate matter Underground mines Ventilation Computational fluid dynamics Dynamic mesh

Research on flow stress in ferrite deformation of a Ti-IF steel

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Journal of University of Science and Technology Beijing 2006年第1期13卷 34-36页

作者： guang xu Chushao xu Jiarong Zhao Xianjun Liu College of Material Science and Engineering Chongqing University 400044 Chongqing China College of Materials and Metallurgy Wuhan University of Science and Technology 430081 Wuhan China

The experiments of the ferrite warm deformation of ultra-low carbon （ULC） Ti-IF steel were carded out on a hot simulator and the influences of deformation temperature, strain, and strain rate on the flow stress were analyzed. New flow stress models suitable to ferrite warm forming of Ti-IF steel were given on the basis of analyzing the influence of deformation technology parameters on the flow stress.

关键词： ULC Ti-IF steel ferrite deformation flow stress model

Anomalous chiral transports and spin polarization in heavy-ion collisions

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Nuclear Science and Techniques 2020年第6期31卷 30-51页

作者： Yu-Chen Liu xu-guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

Relativistic heavy-ion collisions create hot quark–gluon plasma as well as very strong electromagnetic(EM)and fluid vortical *** strong EM field and vorticity can induce intriguing macroscopic quantum phenomena such as chiral magnetic,chiral separation,chiral electric separation,and chiral vortical effects as well as the spin polarization of *** phenomena provide us with experimentally feasible means to study the nontrivial topological sector of quantum chromodynamics,the possible parity violation of strong interaction at high temperature,and the subatomic spintronics of quark–gluon *** studies,both in theory and in experiments,are strongly connected with other subfields of physics such as condensed matter physics,astrophysics,and cold atomic physics,and thus form an emerging interdisciplinary research *** give an introduction to the aforementioned phenomena induced by the EM field and vorticity and an overview of the current status of experimental research in heavy-ion *** also briefly discuss spin hydrodynamics as well as chiral and spin kinetic theories.

关键词： Heavy-ion collision Chiral magnetic effect Spin polarization Quark–gluon plasma

Raman Scattering from Fine Zn Particles Coated with ZnO

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Chinese Physics Letters 1996年第10期13卷 765-767页

作者： xu Jian-feng CHENG guang-xu DU You-wei Department of Physics and Laboratory of Solid State Microstructures Center of Materials Analysis Nanjing UniversityNanjing 210093

Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.

关键词： Raman scattering theory