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High-speed railway track components inspection framework based on YOLOv8 with high-performance model deployment

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High-Speed Railway 2024年第1期2卷 42-50页

作者： Youzhi tang yu Qian Department of Civil and Environmental Engineering University of South CarolinaColumbia 29208USA

Railway inspection poses significant challenges due to the extensive use of various components in vast railway networks,especially in the case of high-speed *** networks demand high maintenance but offer only limited inspection *** response,this study focuses on developing a high-performance rail inspection system tailored for high-speed railways and railroads with constrained inspection *** system leverages the latest artificial intelligence advancements,incorporating YOLOv8 for *** research introduces an efficient model inference pipeline based on a producer-consumer model,effectively utilizing parallel processing and concurrent computing to enhance *** deployment of this pipeline,implemented using C++,TensorRT,float16 quantization,and oneTBB,represents a significant departure from traditional sequential processing *** results are remarkable,showcasing a substantial increase in processing speed:from 38.93 Frames Per Second(FPS)to 281.06 FPS on a desktop system equipped with an Nvidia RTX A6000 GPU and from 19.50 FPS to 200.26 FPS on the Nvidia Jetson AGX Orin edge computing *** proposed framework has the potential to meet the real-time inspection requirements of high-speed railways.

关键词： High-speed railway Track inspection Computer vision Deep learning Edge computing Real-time decision making

Fully polarized Compton scattering in plane waves and its polarization transfer

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Matter and Radiation at Extremes 2024年第3期9卷 45-56页

作者： Suo tang yu Xin Meng Wen Mamat Ali Bake Baisong Xie College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdaoShandong 266100China Department of Physics Hubei UniversityWuhan 430062China Xinjiang Key Laboratory of Solid State Physics and Devices School of Physics Science and TechnologyXinjiang UniversityUrumqi 830017China Key Laboratory of Beam Technology of the Ministry of Education and College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China

Fully polarized Compton scattering from a beam of spin-polarized electrons is investigated in plane-wave backgrounds in a broad intensity region from the perturbative to the nonperturbative *** the perturbative regime,polarized linear Compton scattering is considered for investigating polarization transfer from a single laser photon to a scattered photon,and in the high-intensity region,the polarized locally monochromatic approximation and locally constant field approximation are established and are employed to study polarization transfer from an incoming electron to a scattered *** numerical results suggest an appreciable improvement of about 10%in the scattering probability in the intermediate-intensity region if the electron’s longitudinal spin is parallel to the laser *** longitudinal spin of the incoming electron can be transferred to the scattered photon with an efficiency that increases with laser intensity and collisional *** collision between an optical laser with frequency1 eV and a 10 GeV electron,this polarization transfer efficiency can increase from about 20%in the perturbative regime to about 50%in the nonperturbative regime for scattered photons with relatively high energy.

关键词： polarized scattered transfer

Investigating the elliptic anisotropy of identified particles in p-Pb collisions with a multi-phase transport model

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Nuclear Science and Techniques 2024年第2期35卷 160-169页

作者： Si-yu tang Liang Zheng Xiao-Ming Zhang Ren-Zhuo Wan School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200China School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China

The elliptic azimuthal anisotropy coefficient(v_(2))of the identified particles at midrapidity(|η|<0.8)was investigated in p-Pb collisions at√s_(NN)=5.02 TeV using a multi-phase transport model(AMPT).The calculations of differential v_(2)based on the advanced flow extraction method of light flavor hadrons(pions,kaons,protons,andΛ)in small collision systems were extended to a wider transverse momentum(p_(T))range of up to 8 GeV/c for the first *** string-melting version of the AMPT model provides a good description of the measured p_(T)-differential v_(2)of the mesons but exhibits a slight deviation from the baryon v_(2).In addition,we observed the features of mass ordering at low p_(T)and the approximate number-of-constituentquark(NCQ)scaling at intermediate p_(T).Moreover,we demonstrate that hadronic rescattering does not have a significant impact on v_(2)in p-Pb collisions for different centrality selections,whereas partonic scattering dominates in generating the elliptic anisotropy of the final *** study provides further insight into the origin of collective-like behavior in small collision systems and has referential value for future measurements of azimuthal anisotropy.

关键词： Azimuthal anisotropy Small collision systems Transport model

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变频激励响应分析及模态阻尼反演理论研究

船舶力学 2019年第11期23卷 1339-1350页

作者：唐宇航王雪仁李欣中国人民解放军92578部队北京100161 陆军装甲兵学院北京10072

实际工程结构中阻尼参数的获取往往依据规范经验或传统试验测试方法,然而经验取值普适性弱,传统测试方法中模态混叠难以有效分离、测点布置复杂以及某些情况下激励时序信号不易测量等问题,均给阻尼参数识别带来了困难。文章从多自由度... 详细信息

实际工程结构中阻尼参数的获取往往依据规范经验或传统试验测试方法,然而经验取值普适性弱,传统测试方法中模态混叠难以有效分离、测点布置复杂以及某些情况下激励时序信号不易测量等问题,均给阻尼参数识别带来了困难。文章从多自由度模态叠加法动响应分析入手,提出了运用共振频率及其邻近频率激励响应反演系统模态阻尼的方法,推导了响应与阻尼比的理论关系,给出了“复合比例因子”的概念,并指出忽视系统共振响应与最大响应间的差异,往往会造成某些计算结果的大幅偏差。以某船船体梁数值计算为例,结合规范验证了阻尼反演理论及其公式的可靠性,并进一步对其进行了二维推广,完成了3块不同型式复合材料局部船体板单元结构模型的阻尼比测试,就其阻尼性能与钢材进行对比,发现复合材料在减振降噪方面有诱人的应用前景。该理论为潜艇总振动阻尼估算方法以及分布式阻尼研究提供了技术支撑。

关键词：模态阻尼比识别反演理论共振激励变频激励船体梁局部板单元

Patient-derived induced pluripotent stem cells with a MERTK mutation exhibit cell junction abnormalities and aberrant cellular differentiation potential

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World Journal of Stem Cells 2024年第5期16卷 512-524页

作者： hang Zhang Ling-Zi Wu Zhen-yu Liu Zi-Bing Jin Beijing Institute of Ophthalmology Beijing Tongren Eye CenterBeijing Tongren HospitalCapital Medical UniversityBeijing 100730China

BACKGROUND Human induced pluripotent stem cell(hiPSC)technology is a valuable tool for generating patient-specific stem cells,facilitating disease modeling,and invest-igating disease ***,iPSCs carrying specific mutations may limit their clinical applications due to certain inherent *** To investigate the impact of MERTK mutations on hiPSCs and determine whether hiPSC-derived extracellular vesicles(EVs)influence anomalous cell junction and differentiation *** We employed a non-integrating reprogramming technique to generate peripheral blood-derived hiPSCs with and hiPSCs without a MERTK ***-somal karyotype analysis,flow cytometry,and immunofluorescent staining were utilized for hiPSC *** and proteomics were employed to elucidate the expression patterns associated with cell junction abnormalities and cellular differentiation ***,EVs were isolated from the supernatant,and their RNA and protein cargos were examined to investigate the involvement of hiPSC-derived EVs in stem cell junction and *** The generated hiPSCs,both with and without a MERTK mutation,exhibited normal karyotype and expressed pluripotency markers;however,hiPSCs with a MERTK mutation demonstrated anomalous adhesion capability and differentiation potential,as confirmed by transcriptomic and proteomic ***,hiPSC-derived EVs were involved in various biological processes,including cell junction and *** HiPSCs with a MERTK mutation displayed altered junction characteristics and aberrant differentiation ***,hiPSC-derived EVs played a regulatory role in various biological processes,including cell junction and differentiation.

关键词： Cell junction Cellular differentiation Extracellular vesicle Human induced pluripotent stem cells Transcriptomics Proteomics

High-performance carbon-electrode-based self-powered optoelectronic synaptic devices

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Science China(Information Sciences) 2024年第5期67卷 339-340页

作者： Wen HUANG Xuwen XIA Huixing Zhang Tenglong GUO Pengjie hang Bin LI Jiawei tang Biao LI Chen ZHU Lei WANG Deren YANG Xuegong yu Xing'ao LI Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science Nanjing University of Posts and Telecommunications College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University

A two-terminal self-powered optoelectronic structure could mimic synaptic functions of a human brain synapse unit(Figure 1(a)) based on the photovoltaic effects [1], demonstrating the potential for decreasing energy consumption for future computing. However, current self-powered optoelectronic synaptic devices face issues of stability and cost,which mainly arise from noble metal electrodes and independent hole transport layers used in these structures. Substituting low-cost carbon for these metal electrodes and carrier transport layers may promise to solve these challenges.

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The effect of Ti and Zr content on the structure,mechanics and energy-release characteristics of Ti—Zr—Ta alloys

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Defence Technology（防务技术） 2024年第1期31卷 343-350页

作者： Jia-yu Meng Jing-zhi He Bin Zhang Jin Chen Shun Li Dun Niu yu tang Xi’an Modern Chemistry Research Institute Xi'an710065China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China

Energetic structural materials(ESMs)are a new type of structural materials with bearing and damage *** this work the microstructure,mechanical properties and energy release characteristics of multi-element Ti-Zr-Ta alloys with good casting performance were *** microstructure of the Ti_(x)ZrTa alloys gradually change from BCC+HCP to single BCC structure with the increase of *** the Ti_(2)Zr_(y)Ta alloys was still uniform and single BCC structure with the increase of *** evolution of microstructure and composition then greatly affect the mechanical properties and energy-release characteristics of Ti-Zr-Ta *** synergistic effect of dual phase structure increases the fracture strain of Ti_(x)ZrTa(x=0.2,0.5)with the Ti content decreases,while the fracture strain of Ti_(x)ZrTa(x=2.0,3.0,4.0)gradually increase with the Ti content increases caused by the annihilation of the obstacles for dislocation *** as Zr content increases,the fracture strain of Ti_(2)Zr_(y)Ta alloys decrease,then the oxidation reaction rate and fragmentation degree gradually *** higher oxidation rate and the lager exposed oxidation area jointly leads the higher releasing energy efficiency of Ti_(x)ZrTa alloys with low Ti content and Ti_(2)Zr_(y)Ta alloys with high Zr content.

关键词： Energetic structural materials Ti-Zr-Ta Multi-element alloy Energy release characteristics

Systematic engineering of BiVO_(4)photoanode for efficient photoelectrochemical water oxidation

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Carbon Energy 2024年第4期6卷 12-21页

作者： Zhiting Liang Meng Li Kai‐hang Ye Tongxin tang Zhan Lin yuying Zheng Yongchao Huang Hongbing Ji Shanqing Zhang Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhouChina Chemical Engineering Guangdong Laboratory Jieyang Branch of ChemistryJieyangChina Key Laboratory for Water Quality and Conservation of the Pearl River Delta Institute of Environmental Research at Greater Bay AreaMinistry of EducationGuangzhou UniversityGuangzhouChina State Key Laboratory Breeding Base of Green‐Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhouChina School of Environment and Science Centre for Catalysis and Clean EnergyGriffith UniversityGold Coast CampusSouthportQueenslandAustralia

BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),weak photogenerated charge separation efficiency(Φ_(Sep)),and low water oxidation efficiency(Φ_(OX)).Herein,we tackle these challenges of the BiVO_(4)photoanodes using systematic engineering,including catalysis engineering,bandgap engineering,and morphology *** particular,we deposit a NiCoO_(x)layer onto the BiVO_(4)photoanode as the oxygen evolution catalyst to enhance theΦ_(OX)of Fe‐g‐C_(3)N_(4)/BiVO_(4)for PEC water oxidation,and incorporate Fe‐doped graphite‐phase C_(3)N_(4)(Fe‐g‐C_(3)N_(4))into the BiVO_(4)photoanode to optimize the bandgap and surface areas to subsequently expand the light absorption range of the photoanode from 530 to 690 nm,increase the LHE andΦ_(Sep),and further improve the oxygen evolution reaction activity of the NiCoO_(x)catalytic ***,the maximum photocurrent density of the as‐prepared NiCoO_(x)/Fe‐g‐C_(3)N_(4)/BiVO_(4)is remarkably boosted from 4.6 to 7.4 mA cm^(−2).This work suggests that the proposed systematic engineering strategy is exceptionally promising for improving LHE,Φ_(Sep),andΦ_(OX)of BiVO_(4)‐based photoanodes,which will substantially benefit the design,preparation,and large‐scale application of next‐generation high‐performance photoanodes.

关键词： bismuth vanadate carbon nitride charge separation heterojunction water oxidation

Supporting-electrolyte-free electrochemical[2+2+1]annulation of benzo[d]isothiazole 1,1-dioxides,N-arylglycines and paraformaldehyde

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Chinese Chemical Letters 2024年第6期35卷 327-330页

作者： Hai-Yang Song Jun Jiang yu-hang Song Min-hang Zhou Chao Wu Xiang Chen Wei-Min He School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

The H-bond promoted electrochemical[2+2+1]annulation of benzo[d]isothiazole 1,1-dioxides,Narylglycines and paraformaldehyde for the synthesis of various benzo[d]imidazo[1,5-b]isothiazole 5,5-dioxide derivatives under ... 详细信息

关键词： H-bond N-Arylglycines Paraformaldehyde Organic electro-synthesis Electrolyte-free