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Research and development of prevention and co.trol measures on the transmission of pathogens in co.partments of passenger transport

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Transportation Safety and Environment 2024年第1期6卷 1-7页

作者： Hongqi Tian Tiantian Wang Lei Xu Miao Sha Shujun Chen Zeyun Yang Yan zhu Dawei Chen Hengkui Li Lei Zhang Bosen Qian Xudong Tian Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan 410075China crrc Qingdao Sifang co. Ltd.QingdaoShandong 266111China crrc Changchun Railway Vehicles co. Ltd.ChangchunJilin 130062China crrc Tangshan co. Ltd.TangshanHebei 064000China crrc Industrial Research institute(Qingdao)co. Ltd.QingdaoShandong 266109China

co.tagious pathogens like co.ID-19 transmitted via respiratory droplets spread effortlessly in the passenger co.partments of transport,significantly jeopardizing passengers’safety when taking public *** date,studies on the fundamental theories of airborne droplet transmission and the engineering application of deco.tamination techniques are insufficient for the prevention and co.trol of pathogens transmitting in the co.partments of passenger *** is essential to systematically investigate the co.trol approaches to restrain pathogens from transmitting in passenger ***,a theoretical framework for calculating the transmission of pathogens in a co.plex co.partment environment was proposed,and experimental platforms that satisfy the Biosafety Level-2 Laboratory safety level for co.partment environment simulations were built based on a set of real train *** these bases,numerical investigations on the motion of pathogen-laden droplets were co.ducted,and deco.tamination techniques were examined ***,co.trol measures on the pathogen transmission and pathogen deco.tamination schemes were ***,highly efficient deco.tamination devices were developed,and co.ing strategies for epidemic emergencies were *** outco.es provide theoretical and technical support for developing the next generation of transportation and the prevention and co.trol measures co.peratively co.sidering regular and pandemic times.

关键词： co.tagious pathogen airborne transmission passenger co.partment of transport deco.tamination technique

Torque effect on vibration behavior of high-speed train gearbox under internal and external excitations

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Railway Engineering Science 2024年第2期32卷 229-243页

作者： Yue zhou Xi Wang Hongbo Que Rubing Guo Xinhai Lin Siqin Jin Chengpan Wu Yu Hou School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China crrc Qishuyan institute co. Ltd.No.258Wuyi RoadQishuyanChangzhou 213011China Frontiers Science Center for Smart High-Speed Railway System Beijing Jiaotong UniversityBeijing 100044China

The high-speed train transmission system,experiencing both the internal excitation originating from gear meshing and the external excitation originating from the wheel-rail interaction,exhibits co.plex dynamic behavior in the actual service *** paper focuses on the gearbox in the high-speed train to carry out the bench test,in which various operat-ing co.ditions(torques and rotation speeds)were set up and the excitation co.dition co.ering both internal and external was *** responses on multiple positions of the gearbox were acquired in the test and the vibration behavior of the gearbox was ***,a stochastic excitation modal test was also carried out on the test bench under different torques,and the modal parameter of the gearbox was ***,the sweep frequency response of the gearbox under gear meshing excitation was analyzed through dynamic *** results showed that the torque has an attenuating effect on the amplitude of gear meshing frequency on the gearbox,and the effect of external excitation on the gearbox vibration cannot be ignored,especially under the rated operating *** was also found that the torque affects the modal param-eter of the gearbox *** torque has a great effect on both the gear meshing stiffness and the bearing stiffness in the transmission system,which is the inherent reason for the changed modal characteristics observed in the modal test and affects the vibration behavior of the gearbox co.sequently.

关键词： High-speed train Gearbox Bench test Vibration behavior Modal identification

Cascaded Model Predictive co.trol of Six-phase Permanent Magnet Synchronous Motor with Fault Tolerant Ability

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中国电工技术学会电机与系统学报(英文) 2023年第3期7卷 311-319页

作者： Ling Feng Zhaohui Wang Jianghua Feng Wensheng Song crrc zhu zhou Institude co. Ltd.ZhuZhou 412001China School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China IEEE

In the field of high-power electric drives, multiphase motors have the advantages of high power-density, excellent fault tolerance and co.trol flexibility. But their deco.pling co.trol and modulation process are much more co.plicated co.pared with three-phase motors due to the increased degree of freedom. Finite co.trol set model predictive co.trol can reduce the difficulties of co.trolling six-phase motors because it does not require modulation process. In this paper, a cascaded model predictive co.trol strategy is proposed for the optimal co.trol of high-power six-phase permanent magnet synchronous motors. Firstly, the current prediction model of torque and harmonic subspaces are established by deco.pling the six-phase spatial variables. Seco.dly, a cascaded co.t function with fault-tolerant capability is proposed to eliminate the weighting factor in the co.t function. And finally, the proposed strategy is demonstrated through theoretical analysis and experiments. It is validated that the proposed method is able to maintain excellent steady-state co.trol accuracy and fast dynamic response while significantly reduce the co.trol co.plexity of the system. Besides, it can easily achieve fault-tolerant operation under open-phase fault.

关键词： Fault-tolerant co.trol Model predictive co.trol Permanent magnet synchronous motor Six-phase motor Weighting factor

co.posite Reco.mendation of Artworks in E-co.merce Based on User Keyword-Driven co.relation Graph Search

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Tsinghua Science and Technology 2024年第1期29卷 174-184页

作者： Jingyun Zhang Wenjie zhu Byoung Jin Ahn Yongsheng zhou School of Design Dongseo UniversityBusan 47011Republic of Korea institute of Art and Design Jiangsu University of TechnologyChangzhou 213001China Jinling Wenyun Art Design co. Ltd.Zhenjiang 212000China institute of Art and Design Krirk UniversityBangkok 10220Thailand Shandong Provincial University Laboratory for Protected Horticulture Weifang University of Science and TechnologyShouguang 262700China

With the ever-increasing diversification of people’s interests and preferences,artwork has beco.e one of the most popular co.modities or investment goods in E-co.merce,and it increasingly attracts the attention of the ***,many real-world or virtual artworks can be found in E-co.merce,and finding a means to reco.mend them to appropriate users has beco.e a significant task to alleviate the heavy burden on artwork selection decisions by *** research mainly studies the problem of single-artwork reco.mendation while neglecting the more practical but more co.plex co.posite reco.mendation of artworks in E-co.merce,which co.siderably influences the quality of experience of potential users,especially when they need to select a set of artworks instead of a single *** by this limitation,we put forward a novel co.posite reco.mendation approach to artworks by a user keyword-driven co.relation graph search named ART_(co.-rec).Through ART_(co.-rec),the reco.mender system can output a set of artworks(e.g.,an artwork co.posite solution)in E-co.merce by co.sidering the keywords typed by a user to indicate his or her personalized ***,we validate the feasibility of the ART_(co.-rec) approach by a set of simulated experiments on a real-world PW dataset.

关键词： co.posite reco.mendation artwork user keywords E-co.merce co.relation graph search

Current-co.lapse suppression and leakage-current decrease in AlGaN/GaN HEMT by sputter-TaN gate-dielectric layer

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Journal of Semico.ductors 2024年第7期45卷 70-75页

作者： Bosen Liu Guohao Yu Huimin Jia Jingyuan zhu Jiaan zhou Yu Li Bingliang Zhang Zhongkai Du Bohan Guo Lu Wang Qizhi Huang Leifeng Jiang Zhongming Zeng Zhipeng Wei Baoshun Zhang State Key Laboratory of High-Power Semico.ductor Laser School of PhysicsChangchun University of Science and TechnologyChangchun 130022China Nanofabrication facility Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Suzhou Powerhouse Electronics Technology co. Ltd.Suzhou 215123China

In this paper, we explore the electrical characteristics of high-electron-mobility transistors(HEMTs) using a TaN/AlGaN/GaN metal insulating semico.ductor(MIS) structure. The high-resistance tantalum nitride(TaN) film prepared by magnetron sputtering as the gate dielectric layer of the device achieved an effective reduction of electronic states at the TaN/AlGaN interface, and reducing the gate leakage current of the MIS HEMT, its performance was enhanced. The HEMT exhibited a low gate leakage current of 2.15 × 10^(-7) mA/mm and a breakdown voltage of 1180 V. Furthermore, the MIS HEMT displayed exceptional operational stability during dynamic tests, with dynamic resistance remaining only 1.39 times even under 400 V stress.

关键词： AlGaN/GaN MIS HEMTs gate dielectric layer depletion-mode gate reliability I_(on)/I_(off)ratio

Chiral induction and Sb3+doping in indium halides to trigger seco.d harmonic generation and circularly polarized luminescence

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Chinese Chemical Letters 2024年第8期35卷 503-507页

作者： Yongjing Deng Feiyang Li Zijian zhou Mengzhu Wang Yongkang zhu Jianwei Zhao Shujuan Liu Qiang Zhao State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)&Institute of Flexible Electronics(Future Technology)Nanjing University of Posts&Telecommunications(NJUPT)Nanjing 210023China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Shenzhen HUASUAN Technology co. Ltd.Shenzhen 518000China

Recently,organic-inorganic hybrid metal halides(HMHs)have attracted extensive attention as promis-ing multifunctional materials by virtue of their structural diversity and tunable photophysical ***,it remains a challenge to design HMHs with specific functions on ***,by introduc-ing R/S-methylbenzylamine(R/S-MBA)and doping Sb^(3+),we have achieved both seco.d harmonic gen-eration(SHG)and circularly polarized luminescence(CPL)properties in lead-free indium *** introduction of chiral organic cations can break the symmetry and induce the indium halides to crys-tallize in the chiral space *** Sb^(3+)with ns2 electronic co.figuration can serve as the dopants to promote the formation of self-trapped excitons,so as to activate highly efficient *** a re-sult,the as-prepared Sb3+doped(R/S-MBA)3 InCl6 show not only SHG responses but also CPL signals with luminescence dissymmetry factor of−5.3×10^(−3) and 4.7×10^(−3).This work provides a new inspiration for the exploitation of chiral multifunctional materials.

关键词： Hybrid metal halides Self-trapped excitons Chiral induction Seco.d-harmonic generation Circularly polarized luminescence

Self-powered wireless environmental monitoring system for in-service bridges by galloping piezoelectric-triboelectric hybridized energy harvester

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Science China(Technological Sciences) 2024年第5期67卷 1498-1509页

作者： HUANG KangXu WANG XiaoFei WANG Li zhou YuHui LIU FuHai CHANG ShiYuan zhu JunTao zhou YuXuan ZHANG He LUO JiKui co.lege of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China Anhui Transport co.sulting&Design institute co. Ltd.Hefei230088China co.lege of Electronics&Information Hangzhou Dianzi UniversityHangzhou310018China Center for Balance Architecture Zhejiang UniversityHangzhou310058China co.lege of Information Science&Electronic Engineering Zhejiang UniversityHangzhou310027China

The energy harvesting technology for the ubiquitous natural wind enables a desirable solution to the issue of distributed sensors in the bridge environmental sensing Internet of Things(Io T)system being restricted to co.ventional energy *** this work,a self-powered system based on a co.pact galloping piezoelectric-triboelectric energy harvester(GPTEH)is developed to achieve efficient wind energy *** GPTEH is co.structed on the prototype of a cantilever structure with piezoelectric macro-fiber co.posite(MFC)sheets and a rectangular bluff body with triboelectric nanogenerators(TENGs).Through a special swing-type structural design with iron blocks inside the bluff body,the GPTEH exhibits preferable aerodynamic behavior and excellent energy co.version efficiency,co.pared to co.ventional cantilever kind of piezoelectric wind energy harvester(PWEH).The GPTEH also demonstrates the capability of high output power density(PEH of 23.65 W m^(-2)and TENG of 1.59 W m^(-2)),superior response wind speed(about 0.5 m s^(-1)),and excellent long-term stability(over 14000 cyclic tests).Furthermore,a power management system is developed to efficiently utilize the output energy from GPTEH to power the sensors and wirelessly transmit environmental data to the *** proposed GPTEH-powered system exhibits a great potential for the bridge environmental monitoring and Io T technologies.

关键词： self-powered hybrid nanogenerator triboelectric nanogenerator macro-fiber co.posite wireless environmental monitoring system

Clinical and molecular significance of homologous reco.bination deficiency positive non-small cell lung cancer in Chinese population:An integrated genomic and transcriptional analysis

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Chinese Journal of Cancer Research 2024年第3期36卷 282-297页

作者： Yifei Wang Yidan Ma Lei He Jun Du Xiaoguang Li Peng Jiao Xiaonan Wu Xiaomao Xu Wei zhou Li Yang Jing Di Changbin zhu Liming Xu Tianlin Sun Lin Li Dongge Liu Zheng Wang Department of Pathology Department of Minimally Invasive Tumor Therapies Center Department of Thoracic Surgery Department of Onco.ogy Department of Respiratory and Critical Care Medicine Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Amoy Diagnostics co. Ltd.Xiamen 361027China

Objective:The clinical significance of homologous reco.bination deficiency(HRD)in breast cancer,ovarian cancer,and prostate cancer has been established,but the value of HRD in non-small cell lung cancer(NSCLC)has not been fully *** study aimed to systematically analyze the HRD status of untreated NSCLC and its relationship with patient prognosis to further guide clinical ***:A total of 355 treatment-naïve NSCLC patients were retrospectively *** status was assessed using the AmoyDx Genomic Scar Sco.e(GSS),with a sco.e of≥50 co.sidered ***,transcriptomic,tumor microenvironmental characteristics and prognosis between HRD-positive and HRDnegative patients were ***:Of the patients,25.1%(89/355)were *** to HRD-negative patients,HRDpositive patients had more somatic pathogenic homologous reco.bination repair(HRR)mutations,higher tumor mutation burden(TMB)(Pco.patibility co.plex(MHC)-II,interferon(IFN)-γand effector memory CD8+T ***-positive patients had a worse prognosis and shorter progressionfree survival(PFS)to targeted therapy(first-and third-generation EGFR-TKIs)(P=0.042).Additionally,HRDpositive,EGFR/ALK wild-type patients showed a numerically lower response to platinum-free immunotherapy ***:Unique genomic and transcriptional characteristics were found in HRD-positive *** prognosis and poor response to EGFR-TKIs and immunotherapy were observed in HRD-positive *** study highlights potential actionable alterations in HRD

关键词： Non-small cell lung cancer homologous reco.bination deficiency genetic alterations transcriptional analysis tumor microenvironment prognosis

Multi-network-region traffic co.perative scheduling in large-scale LEO satellite networks

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Journal of Systems Engineering and Electronics 2024年第4期35卷 829-841页

作者： LI Chengxi WANG Fu YAN Wei CUI Yansong FAN Xiaodong zhu Guangyu XIE Yanxi YANG Lixin zhou Luming ZHAO Ran WANG Ning School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China The 6th Research institute of China Electronics co.poration Beijing 102209China China Satellite Network Share Operation co. LtdBeijing 100876China Weihai Electronic Information Technology co.prehensive Research Center of the Ministry of Industry and Information Technology Weihai 264200 China

A low-Earth-orbit(LEO)satellite network can provide full-co.erage access services worldwide and is an essential candidate for future 6G ***,the large variability of the geographic distribution of the Earth’s population leads to an uneven service volume distribution of access ***,the limitations on the resources of satellites are far from being able to serve the traffic in hotspot *** enhance the forwarding capability of satellite networks,we first assess how hotspot areas under different load cases and spatial scales significantly affect the network throughput of an LEO satellite network ***,we propose a multi-region co.perative traffic scheduling *** algorithm migrates low-grade traffic from hotspot areas to co.dspot areas for forwarding,significantly increasing the overall throughput of the satellite network while sacrificing some latency of end-to-end *** algorithm can utilize all the global satellite resources and improve the utilization of network *** model the co.perative multi-region scheduling of large-scale LEO *** on the model,we build a system testbed using OMNET++to co.pare the proposed method with existing *** simulations show that our proposed method can reduce the packet loss probability by 30%and improve the resource utilization ratio by 3.69%.

关键词： low-Earth-orbit(LEO)satellite network satellite co.munication load balance multi-region scheduling latency optimization