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Passenger management strategy and evacuation in subway station under Covid-19

Chinese Physics B 2022年第7期31卷 657-668页

作者： Xiao-Xia Yang Hai-Long Jiang yuan-lei kang Yi Yang Yong-Xing Li Chang Yu School of Information and Control Engineering Qingdao University of TechnologyQingdao 266520China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China CRRC Qingdao Sifang CO. LTD.Qingdao 266111China Beijing Key Laboratory of Traffic Engineering Beijing University of TechnologyBeijing 100124China

Under the background of Covid-19 sweeping the world,safe and reasonable passenger flow management strategy in subway stations is an effective means to prevent the spread of *** on the social force model and the minimum cost model,the movement and path selection behavior of passengers in the subway station are modeled,and a strategy for passenger flow management to maintain a safe social distance is put *** Qingdao Jinggangshan Road subway station of China as the simulation scene,the validity of the simulation model is verified by comparing the measured value and simulation value of the time required for passengers from getting off the train to the ticket *** results indicate that controlling the time interval between incoming passengers at the entrance can effectively control the social distance between passengers and reduce the risk of epidemic *** comparing the evacuation process of passengers under different initial densities,it is found that the greater the initial density of passengers is,the longer the passengers are at risk social *** the process of passenger emergency evacuation,the stairs/escalators and ticket gates are bottleneck areas with high concentration of passenger density,which should be strictly disinfected many times on the basis of strictly checking the health code of incoming passengers and controlling the arrival time *** simulation results of this paper verify the harmfulness of passenger emergency evacuation without protective measures,and provide theoretical support for the operation and management of subway station under the epidemic situation.

关键词： COVID-19 social force model subway station evacuation

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A promising approach for quantifying focal stroke modeling and assessing stroke progression:optical resolution photoacoustic microscopy photothrombosis

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Neural Regeneration Research 2025年第7期20卷 2029-2037页

作者： Xiao Liang Xingping Quan Xiaorui Geng Yujing Huang Yonghua Zhao lei Xi Zhen yuan Ping Wang Bin Liu Faculty of Health Sciences University of MacaoMacao Special Administrative RegionChina Center for Cognitive and Brain Sciences University of MacaoMacao Special Administrative RegionChina Department of Biomedical Engineering Southern University of Science and TechnologyShenzhenGuangdong ProvinceChina State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoTaipaMacao Special Administrative RegionChina Department of Emergency Zhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

To investigate the mechanisms underlying the onset and progression of ischemic stroke,some methods have been proposed that can simultaneously monitor and create embolisms in the animal cerebral ***,these methods often require complex systems and the effect of age on cerebral embolism has not been adequately studied,although ischemic stroke is strongly *** this study,we propose an optical-resolution photoacoustic microscopy-based visualized photothrombosis methodology to create and monitor ischemic stroke in mice simultaneously using a 532 nm pulsed *** observed the molding process in mice of different ages and presented age-dependent vascular embolism ***,we integrated optical coherence tomography angiography to investigate age-associated trends in cerebrovascular variability following a *** imaging data and quantitative analyses underscore the differential cerebrovascular responses to stroke in mice of different ages,thereby highlighting the technique's potential for evaluating cerebrovascular health and unraveling age-related mechanisms involved in ischemic strokes.

关键词： age-dependent cerebral cortex ischemic stroke mouse model optical coherence tomography angiography photoacoustic microscopy photothrombosis vascular imaging

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冲击点火反应过程中RDX基PBX炸药的热辐射特性

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高压物理学报 2025年第1期39卷 44-52页

作者：施鑫辉杨雷杨雪康洪亮袁文硕刘福生西南交通大学物理科学与技术学院高温高压物理研究所四川成都610031

研究冲击波流场中聚合物黏结炸药的热辐射特性可能是获取相关物质组分温度数据的重要途径。利用二级轻气炮加载技术、瞬态辐射测温方法及粒子速度剖面测量技术,探讨了聚合物黏结炸药/氟化锂窗口界面的热辐射特性及其与界面压力之间的相... 详细信息

研究冲击波流场中聚合物黏结炸药的热辐射特性可能是获取相关物质组分温度数据的重要途径。利用二级轻气炮加载技术、瞬态辐射测温方法及粒子速度剖面测量技术,探讨了聚合物黏结炸药/氟化锂窗口界面的热辐射特性及其与界面压力之间的相关性;同时,还优化了聚合物黏结炸药样品制备方法,显著抑制了包裹气体和界面间隙发光背景,给出了界面辐亮度数据及界面温度数据。结果表明,在连续2次冲击加载过程中,界面温度随时间衰减特征与反应产物的等熵膨胀行为密切相关,界面温度反映了界面处产物温度的演化行为,为直接观测点火反应和起爆释能期间非均质复合炸药的反应产物温度数据提供了一种可行的技术途径。

关键词：聚合物黏结炸药冲击加载界面热辐射点火反应等熵膨胀界面温度

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Highly enantioselective construction of CF_(3) -bearing all-carbon quaternary stereocenters: Chiral spiro-fused bisoxazoline ligands with 1,1'-binaphthyl sidearm for asymmetric Michael-type Friedel-Crafts reaction

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Chinese Chemical Letters 2022年第5期33卷 2415-2419页

作者： Robert Li-yuan Bao lei Shi kang Fu School of Science Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

A novel class of chiral spiro-fused bisoxazoline ligands possessing a deep chiral pocket was *** developed ligands have been employed in the nickel-catalyzed highly enantioselective Michael-type Friedel-Crafts reaction, affording the products bearing a trifluoromethylated all-carbon quaternary stereocenter with moderate to excellent yields(up to 99%) and good to excellent enantioselectivies(up to> 99.9% ee). Moreover, a proposed model of chiral pocket revealed that the attack of indole from the Re-face of β-CF_(3)-β-disubstituted nitroalkene was favorable.

关键词： Chiral bisoxazoline ligand Chiral pocket Chiral spiro ligand Friedel-Crafts reaction Trifluoromethylated all-carbon quaternary stereocenter

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Review of Si IGBT and SiC MOSFET Based on Hybrid Switch

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Chinese Journal of Electrical Engineering 2019年第3期5卷 20-29页

作者： Puqi Ning Tianshu yuan Yuhui kang Cao Han lei Li Key Laboratory of Power Electronics and Electric Drive Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

SiC Hybrid switch(HyS)combines low conduction loss of Si IGBT and low switching loss of SiC MOSFET,and the cost is closer to that of Si *** promising high performances of HyS will bring considerable achievement in terms of enhancing power density of a converter *** reviewing the gate drive pattern,gate drive hardware,current sharing,module design,converter design,and cost,this paper introduces state-of-the-art SiC HyS.

关键词： Hybrid module SiC device Si IGBT SiC MOSFET

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“Power curve”key factor affecting metallurgical effects of an induction heating tundish

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Journal of Iron and Steel Research International 2022年第1期29卷 151-164页

作者： Bin Yang An-yuan Deng Peng-fei Duan Xiao-lei kang En-gang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110004LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110004LiaoningChina

The key to acquire good metallurgical effects with induction heating tundish is to understand the flow field,temperature field and the movement of inclusions in the tundish with different induction heating power *** on the production of a factory,this work established a multi-field coupling mathematical model to find out the link between the heating power curve and the metallurgical effects of the *** results indicated that the heating efficiency of an induction heating tundish not only was affected by the heating power,but also related to the flow and temperature field in the *** the induction heater was used intermittently and the induction heater was turned on,the molten steel was controlled by electromagnetic force,and the flow field basically remained ***,when the induction heater was turned off,the velocity of molten steel got small,and the thermal buoyancy could greatly change the flow,forming short-circuit flow;besides,large number of inclusions suddenly escaped from the outlet of the *** the molten steel was heated continuously,the flow field,temperature field and inclusions behavior remained basically *** both energy saving and maintaining good metallurgical effects,continuous heating(the power increasing stepwise over time)should be selected.

关键词： Tundish Induction heating Inclusions Flow Temperature

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Oxygen vacancies enriched Ir/WOx catalysts for the directly chem-catalytic conversion of cellulose to ethanol

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Tungsten 2025年第1期 88-99页

作者： Yu-Jing Weng Zhao-Ying Ding Ying-Chao Li yuan-Feng Wu yuan-Yang Xu Rui Chen Xiao-lei Zhao Hai-Yong Wang Da-lei Zhang Yu-Long Zhang Henan Key Laboratory of Coal Green Conversion and International Joint Laboratory of Coal Clean Utilization College of Chemistry and Chemical Engineering Henan Polytechnic University Key Laboratory of Renewable Energy Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Liaoning Institute of Energy Technology

Tungsten and its oxides are highly versatile catalysts with unique properties that hold great promise for a wide array of applications,including biological pathways and chemical *** chemo-catalysis of cellulose to ethanol presents a promising avenue for ethanol synthesis with the potential for enhanced efficiency compared to conventional methods,offering a sustainable and carbon-neutral alternative to existing petrochemical and biological ***,Ir/WOxcatalysts enriched with oxygen vacancies were meticulously prepared and demonstrated remarkable catalytic performance in converting cellulose to ethanol directly in the presence of tungstic *** catalyst achieved a high ethanol yield of 66.5%under optimal reaction conditions,approaching the theoretical yield limit of traditional ethanol *** results revealed the presence of oxygen defects,Bronsted/Lewis acidity,and Ir nanoclusters on the catalyst surface,working synergistically to facilitate the cascade catalysis of cellulose hydrolysis,sugar retro-aldol condensation reaction,and C2 intermediate hydrodeoxygenation to *** situ Fourier transform infrared spectrometer analysis confirmed the catalyst's ability to enhance the adsorption and activation of ethylene glycol for ethanol *** manipulating subtle structural features,this study offers a fresh perspective on tungsten group catalyst design and underscores the importance of synergistic effects among catalytic sites for the efficient production of ethanol from cellulose.

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The unique magnetic damping enhancement in epitaxial Co2Fe1-xMnxAl films

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Chinese Physics B 2019年第9期28卷 332-337页

作者： Shu-Fa Li Chu-yuan Cheng kang-kang Meng Chun-lei Chen College of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiang 524000China State-Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Uniform precession dynamics and its magnetic damping are investigated in epitaxial Co2Fe1-xMnxAl films by using the time-resolved magneto-optical Kerr effect under out-of-plane *** decay time of uniform precession mode decreases, and thus the magnetic damping increases with the increase of external ***, the decay time decreases as x decreases, so that the enhancement of magnetic damping occurs in Fe-rich ***, the decay time decreases as the excitation fluence increases, which drops rapidly at low magnetic field comparing with the slow reduction at high magnetic *** unique magnetic damping enhancement is attributed to the enhancement of homogeneous magnetization.

关键词： ultrafast dynamics pump-probe magnetic damping Heusler alloy

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MINIMIZATION PROBLEM FOR SYMMETRIC ORTHOGONAL ANTI-SYMMETRIC MATRICES

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Journal of Computational Mathematics 2007年第2期25卷 211-220页

作者： yuan lei Anping Liao lei Zhang College of Mathematics and Econometrics Hunan University Changsha 410082 China Department of Information and Computing Science Changsha University Changsha 410003 China

By applying the generalized singular value decomposition and the canonical correlation decomposition simultaneously, we derive an analytical expression of the optimal approximate solution ^-X, which is both a least-squares symmetric orthogonal anti-symmetric solu- tion of the matrix equation A^TXA = B and a best approximation to a given matrix X^＊. Moreover, a numerical algorithm for finding this optimal approximate solution is described in detail, and a numerical example is presented to show the validity of our algorithm.

关键词： Symmetric orthogonal anti-symmetric matrix Generalized singular value decomposition Canonical correlation decomposition

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High-efficiency trace Na extraction from crystal quartz ore used for fused silica-——A pretreatment technology

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1075-1086页

作者： Min Lin Zhen-yu Pei yuan-yuan Liu Zhang-jie Xia kang Xiong Shao-min lei En-wen Wang School of Resources and Environmental Engineering Wuhan University of Technology School of Resources and Environmental Engineering Anshun University

Trace Na sources, extraction dynamics of trace Na, and influences of calcination temperature on quartz lattice, fluid inclusions, and muscovite were studied in detail herein for trace Na extraction from the quartz ore with water leaching at 90℃. Experimental results suggested that the trace Na sources included quartz lattice, fluid inclusions, and muscovite. The extraction rate of the trace Na in quartz ores can reach 31.0wt% after calcination at 900℃ for 5 h and water leaching at 90℃ for 24 h. The extraction process consisting of the dissolution of unfree Na and diffusion of free Na was dominated by calcination temperature. Calcination at 900℃ for 5 h was effective for extraction of the trace Na in fluid inclusions and muscovite. The extraction of the trace Na was mainly affected by the decrepitation of fluid inclusions when the calcination temperature ranged from 400 to 600℃ and by the damage of muscovite when the calcination temperature ranged from 600 to 900℃. Based on the extraction rates at different calcination temperatures, approximately 20.1wt% of the trace Na occurred in fluid inclusions, approximately 10.9wt% existed in muscovite, and 69.0wt% mainly occurred in quartz lattice.

关键词： trace sodium extraction quartz ore fluid inclusion muscovite decrepitation calcination water leaching

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