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Rapid estimation of disaster losses for the M6.8 Luding earthquake on September 5,2022

science China Earth sciences 2023年第6期66卷 1334-1344页

作者： Wenqiang WANG Yilong LI Zhenguo ZHANG Danhua XIN Zhongqiu HE Wei ZHANG Xiaofei CHEN Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology Southern University of Science and TechnologyShenzhen 518055China

An M6.8 earthquake occurred in Luding,Sichuan Province,China,on September 5,*** towns and villages in the earthquake-stricken area are densely populated,the earthquake caused severe fatalities and economic *** estimation of earthquake intensity and disaster losses is significantly important for post-earthquake emergency rescue,scientific anti-seismic deployment,and the reduction of casualties and economic ***,we make a preliminary rapid estimation of the earthquake intensity and disaster losses in the aftermath of the Luding *** seismic intensity represents the distribution of earthquake disasters and the degree of ground damage and can be directly converted from the peak ground velocity(PGV)*** obtain a reliable PGV distribution map of this earthquake,we combined the finite-fault model constrained by seismic observations,with the complex three-dimensional(3D)geological environment and topographical features to perform strong ground motion ***,we compared the consistency between the simulated ground motion waveforms and observations,indicating the plausibility and reliability of *** addition,we transformed the PGV simulation results into intensity and obtained a physics-based map of the intensity distribution of the Luding *** maximum simulated intensity of this earthquake is IX,which is consistent with the maximum intensity determined from the postearthquake field *** on the simulated seismic intensity map of the Luding earthquake and the earthquake disaster loss estimation model,we rapidly estimated the death and economic losses caused by this *** estimated results show that the death toll caused by this earthquake is probably 50-300,with a mathematic expectation of *** the government should launch a Level II earthquake emergency response *** economic losses are likely to be 10-100 billion RMB,with a mathematical expectation of 23.205 billion *** seismic

关键词： Luding earthquake Ground motion simulation Seismic intensity Estimation of disaster losses Fatality Economic losses

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Magnetic field annealing of FeCo-based amorphous alloys to enhance thermal stability and Curie temperature

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Rare Metals 2023年第6期42卷 2000-2006页

作者： Zai-Dao Li Wei-Wei Zhang Ge-Tian Li Song-Song Li Hong-Sheng Ding Tao Zhang Yu-Jun Song Center for Modern Physics Technology Department of Applied PhysicsBeijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceUniversity of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Annealing temperatures and applied magnetic fields are two important parameters for the performance modification of magnetic *** article investigated the effect of different annealing temperatures on crystallization condition,magnetic properties and thermal stability of the amorphous magnetic alloy Co_(36)Fe_(36)Si_(4.8)B1_(9.2)Nb_(4)(at%).Results indicate that the annealing temperature can significantly affect the size and content of precipitated nanocrystals in the amorphous alloy,and the precipitation of nanocrystalline phases can result in the distinct change of magnetic properties and Curie *** the annealing was performed at 595 ℃ for 30 min under an applied transverse external magnetic field of 9550.0A·m^(-1),the amorphous alloy shows excellent soft magnetic properties with the saturation magnetization of alloy reaching 110.00 mA·m^(2)·g^(-1),the residual magnetic induction intensity of 4 × 10^(-6) T and the coercivity as low as57.3 A·m^(-1).Furthermore,the Curie temperature of the field-annealed samples can reach up to 440 0C,approximately 58℃ higher than that of the as-quenched species.

关键词： Soft magnetic alloys Amorphous alloy Field annealing

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Maxwell Demon and Einstein–Podolsky–Rosen Steering

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Chinese physics Letters 2024年第5期41卷 12-16页

作者：胡孟军胡晓敏张永生 Beijing Academy of Quantum Information Sciences Beijing 100193China Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Research of Maxwell demon and quantum entanglement is important because of its foundational significance in physics and its potential applications in quantum information. Previous studies on the Maxwell demon have primarily focused on thermodynamics, taking into account quantum correlations. Here we consider from another perspective and ask whether quantum non-locality correlations can be simulated by performing work. The Maxwell demon-assisted Einstein–Podolsky–Rosen(EPR) steering is thus proposed, which implies a new type of loophole. The application of Landauer's erasure principle suggests that the only way to close this loophole during a steering task is by continuously monitoring the heat fluctuation of the local environment by the *** construct a quantum circuit model of Maxwell demon-assisted EPR steering, which can be demonstrated by current programmable quantum processors, such as superconducting quantum computers. Based on this quantum circuit model, we obtain a quantitative formula describing the relationship between energy dissipation due to the work of the demon and quantum non-locality correlation. The result is of great physical interest because it provides a new way to explore and understand the relationship between quantum non-locality, information, and thermodynamics.

关键词： quantum Maxwell Einstein

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Study on the effect of focal position change on the expansion velocity and propagation mechanism of plasma generated by millisecond pulsed laser-induced fused silica

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Plasma science and technology 2023年第3期25卷 171-180页

作者：王立雪蔡继兴 Jilin Key Laboratory of Solid-state Laser Technology and Application School of PhysicsChangchun University of Science and TechnologyChangchun 130022People’s Republic of China

In this work, by controlling the positional relationship between the target and the focal point, the surface damage, shock wave phenomenon and propagation mechanism involved in the plasma generation of fused silica by millisecond pulsed laser irradiation at different focal positions were studied. Laser energy is an important experimental variable. The dynamic process of plasma was detected by optical shadow method, and the influence of surface film damage on plasma propagation and the propagation mechanism at different focal positions were discussed. The study found that the plasma induced by the pulsed laser at the focus position within 0–20 μs exploded, the micro-droplets formed around 20 μs. At the same time, a shock wave is formed by the compressed air, the micro-droplets are compressed under the action of the shock wave recoil pressure, and the micro-droplets channel phenomenon is observed in the micro-droplets. The peak velocities of plasma and combustion wave appear earlier in the pre-focus position than in the post-focus position. This research provides a reference for the field of laser processing using fused silica as the substrate.

关键词： relationship of different focal positions plasma combustion wave shock wave dynamic mechanism damage morphology

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Pressure evolution in shock-compacted granular media

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Petroleum science 2023年第6期20卷 3736-3751页

作者： Jia-Rui Li Jun-Sheng Zeng Kun Xue State Key Laboratory of Explosive Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Applied Physics and Computational Mathematics Beijing100094China

The pressure evolution associated with the transient shock-induced infiltration of gas flow through granular media consisting of mobile particles is numerically investigated using a coupled Eulerian–Lagrangian *** coupling between shock compaction and interstitial flow has been revealed.A distinctive two-stage diffusing pressure field with deflection occurring at the tail of the compaction front is found,with corresponding spikes in both gaseous velocity and temperature profiles emerging within the width of the compaction *** compaction front,together with the deflection pressure,reaches a steady state during the later *** analytical prediction of the steady deflection pressure that considers the contributions of porosity and the non-isothermal effect is *** isothermal single-phase method we developed,combining the porosity jump condition across the compaction front,shows consistent pressure evolution with the non-isothermal CMP-PIC one under weak shock strength and low column ***,the microscale mechanism governing the formation of not only pressure deflection but also gaseous velocity and temperature spikes within the width of the compaction front has been *** aforementioned evolutions of the flow field are shown to arise from the nozzling effects associated with the particle-scale variations in the volume fraction.

关键词： Shock compaction Pressure evolution Transport in porous media Transient gas infiltration Mobile granular column

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Insights into the deformation mechanisms of an Al1Mg0.4Si alloy at cryogenic temperature:An integration of experiments and crystal plasticity modeling

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Journal of Materials science & technology 2024年第33期200卷 69-82页

作者： Youhong Peng Danyang Li He Wu Kesong Miao Chenglu Liu Li Wang Wei Liu Chao Xu Lin Geng Peidong Wu Guohua Fan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 211816China

In this work,we investigated the mechanical properties and corresponding deformation mechanisms of an Al1Mg0.4Si alloy,which exhibited significantly higher strength and outstanding strain hardening capacity at 77 K compared to its counterparts at 298 *** deformation mechanisms responsible for the excellent strength-ductility synergy and extraordinary strain hardening capacity at cryogenic temperature were elucidated through a combined experimental and simulation *** results reveal the presence of numerous slip traces and microbands throughout grain surfaces during deformation at 298 K,whereas at 77 K,vague grain surfaces dominate,indicating the simultaneous operation of multiple slip *** electron microscopy(TEM)analysis using the two-beam diffraction technique demonstrates the presence of dislocations with several different Burgers vectors inside a grain at cryogenic temperature,confirming the activation of multiple slip *** accumulation of dislocations facilitated by these multiple slip systems,combined with the high dislocation density,contributes to strain hardening and remarkable uniform elongation at 77 K.A modified dislocation density-based crystal plasticity model,incorporating the effect of grain boundary hardening(GBH)and temperature,was developed to gain a better understanding of the underlying mechanisms governing alloy’s strength and *** GBH effect significantly enhances statistically stored dislocation(SSD)density and screw dislocation proportion,which promote homogeneous deformation and enhance strain hardening capacity at cryogenic *** findings deepen the understanding of plastic deformation at cryogenic temperatures and pave the way for the development of ultrahigh-performance metallic materials for cryogenic applications.

关键词： Aluminum alloy Cryogenic temperature Grain boundary hardening effect Deformation mechanism Crystal plasticity modeling

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Revealing the thermal stability of sodium-ion battery from material to cell level using combined thermal-gas analysis

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Journal of Energy Chemistry 2025年第4期103卷 838-849页

作者： Anqi Teng Yue Zhang Lihua Jiang Yue Zhang Hongbin Dang Chenchen Wang Zheng Fang Yong Liu Xuefeng Wang Huang Li Wenxin Mei Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Anhui Provincial Emergency Management Research Institute Hefei 230000AnhuiChina Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing 100049China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina

The future large-scale application of sodium-ion batteries(SIBs)is inseparable from their excellent electrochemical performance and reliable safety *** present,there are few studies focusing on their safety *** analysis of thermal stability and structural changes within a single material cannot systematically describe the complex interplay of components within the battery system during the thermal runaway ***,the reaction between the battery materials themselves and their counterparts within the system can stimulate more intense exothermic behavior,thereby affecting the safety of the entire battery ***,this study delved into the thermal generation and gas evolution characteristics of the positive electrode(Na_(x)Ni_(1/3)Fe_(1/3)Mn_(1/3)O_(2),NFM111)and the negative electrode(hard carbon,HC)in SIBs,utilizing various material *** the integration of microscopic and macroscopic characterization techniques,the underlying reaction mechanisms of the positive and negative electrode materials within the battery during the heating process were *** important results are derived from this study:(Ⅰ)The instability of the solid electrolyte interphase(SEI)leads to its decomposition at temperatures below 100℃,followed by extensive decomposition within the range of 100-150℃,yielding heat and the formation of inorganic compounds,such as Na_(2)CO_(3)and Na_(2)O;(Ⅱ)The reaction between NFM111 and the electrolyte constitutes the primary exothermic event during thermal abuse,with a discernible reaction also occurring between sodium metal and the electrolyte throughout the heating process;(Ⅲ)The heat production and gas generation behaviors of multi-component reactions do not exhibit complete correlation,and the occurrence of gas production does not necessarily coincide with thermal *** results presented in this study can provide useful guidance for the safety improvement of SIBs.

关键词： Sodium-ion battery safety Thermal stability Gas generation Decomposition

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Infrared optical absorption of Fr?hlich polarons in metal halide perovskites

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Chinese physics B 2023年第9期32卷 408-413页

作者：崔钰刘晓逸马旭菲邓加培刘怡言王子武 Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Department of PhysicsSchool of ScienceTianjin UniversityTianjin 300354China

The formation of Frohlich polarons in metal halide perovskites,arising from the charge carrier-longitudinal optical(LO)phonon coupling,has been proposed to explain their exceptional properties,but the effective identification of polarons in these materials is still a challenging ***,we theoretically present the infrared optical absorption of Frohlich polarons based on the Huang-Rhys *** find that multiphonon overtones appear as the energy of the incident photons matches the multiple LO phonons,wherein the average phonon number of a polaron can be directly evaluated by the order of the strongest *** multiphonon structures sensitively depend on the scale of electronic distribution in the ground state and the dimensionality of the perovskite materials,revealing the effective modulation of competing processes between polaron formation and carrier ***,the order of the strongest overtone shifts to higher ones with temperature,providing a potential proof that the carrier mobility is affected by LO phonon *** present model not only suggests a direct way to verify Frohlich polarons but also enriches our understanding of the properties of polarons in metal halide perovskites.

关键词： metal halide perovskites polaron Huang-Rhys factor

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Investigations of inelastic cross sections of H_(2)O molecule by He^(2+) and C^(6+) projectiles with energy range around the Bragg peak

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Nuclear science and Techniques 2025年第2期36卷 141-154页

作者： Guo-Zhuang Li Cheng-Ye Sun Rui Cheng Yan-Shi Zhang Liang-Wen Chen Sheng Zhang Xin-Xia Li Lei Yang School of Nuclear Science and Technology University of South ChinaHengyang 421001China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Interdisciplinary Center for Fundamental and Frontier Sciences Nanjing University of Science and TechnologyJiangyin 214443China Center for Basic Teaching and Experiment Nanjing University of Science and TechnologyJiangyin 214443China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Inelastic collisions are the dominant cause of energy loss in *** the energy range around the Bragg peak,single ionization(SI)and single-electron capture(SC)are the primary inelastic collisions that lead to energy *** study employs the classical trajectory Monte Carlo method to study the SI and SC processes of H_(2)O molecules using He^(2+) and C^(6+) projectiles in the energy range of 10 keV/u to 10 MeV/*** total cross sections,single differential cross sections,impact parameter dependence of SI and SC,and fragmentation cross sections were *** illustrate that the cross section for SI is the highest when the projectile energy is close to the Bragg peak *** the projectile energy is below the Bragg peak energy,the ionized electrons in the forward direction dominate,and the removal of electrons can be associated with large impact *** the projectile energy increases,the emission angle of the electrons gradually transitions from small angles(60°~120°)to large angles(60°~120°),and the removal of electrons is associated with small impact *** energy distributions of the ionized electron are similar when the projectile energy is equal to,below or above the Bragg peak *** fragmentation cross sections after SI and SC in the energy range around the Bragg peak were also estimated.

关键词： Classical trajectory Monte Carlo Heavy ion-water molecule collision Inelastic cross sections

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HEAT KERNEL ON RICCI SHRINKERS(II)

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Acta Mathematica Scientia 2024年第5期44卷 1639-1695页

作者： Yu LI Bing WANG Institute of Geometry and Physics University of Science and Technology of ChinaHefei230026China Hefei National Laboratory Hefei230088China

This paper is the sequel to our study of heat kernel on Ricci shrinkers[29].In this paper,we improve many estimates in[29]and extend the recent progress of Bamler[2].In particular,we drop the compactness and curvature boundedness assumptions and show that the theory of F-convergence holds naturally on any Ricci flows induced by Ricci shrinkers.

关键词： Ricci flow Ricci shrinker heat kernel

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