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Enhancing output performance of triboelectric nanogenerator by increasing charge storage capacity of electrodes

Nano Research 2025年第1期18卷 395-403页

作者： congcong Hao Zekun Wang Mingzhe Cai Shuaining Cheng Zhongxin Wang cong zhai Juan Cui Yongqiu Zheng Chenyang Xue Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education North University of ChinaTaiyuan 030051China

ABSTRACT:The practical application of rotating triboelectric nanogenerators is often limited by the wear of high-friction surface materials and low surface charge *** addition to the charge pump replenishment strategy,suppressing charge decay is also crucial for increasing surface charge ***,we present a high performance rotary triboelectric nanogenerator(HPR-TENG)based on a coplanar charge pumping strategy and polyvinyl chloride(PVC)*** has been demonstrated that applying PVC film to the surface of the storage electrode of the main TENG(M-TENG)significantly enhances the M-TENG’s output ***,the HPR-TENG with three layers of PVC film pasted achieved the best output performance,with a peak-topeak output voltage of 2828 V,a peak-to-peak output current of 327μA and a charge transfer of 0.81μC at 500 *** addition,the output improvement effects of different materials are *** TENG with 3 layers of PVC film pasted on it has a maximum output power of 748 mW at a load resistance of 4×10^(6)Ω.HPR-TENG’s output performance remains consistent after 100,000 cycles,which shows excellent *** excellent electrical performance of the HPR-TENG can be used as the energy supply for the tip high-voltage breakdown sensor system,which can achieve 14 breakdowns in 10 *** to its extraordinary electrical performance,HPRTENG can not only serve as an energy supply for cutting-edge high-voltage breakdown sensor systems,but also has the potential to serve as an energy supply for high-pressure sterilization,high-pressure vacuum and water electrolysis.

关键词： triboelectric nanogenerator coplanar charge pump enhancing charge density suppressing charge decay polyvinyl chloride(PVC)film

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A new continuum model with driver's continuous sensory memory and preceding vehicle's taillight

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Communications in Theoretical Physics 2020年第10期72卷 29-41页

作者： cong zhai Weitiao Wu School of Transportation and Civil Engineering and Architecture Foshan UniversityFoshan 528000 GuangdongChina School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641 GuangdongChina

Car taillights are ubiquitous during the deceleration process in real traffic,while drivers have a memory for historical *** collective effect may greatly affect driving behavior and traffic flow *** this paper,we propose a continuum model with the driver's memory time and the preceding vehicle's *** better reflect reality,the continuous driving process is also *** this end,we first develop a unique version of a car-following *** converting micro variables into macro variables with a macro conversion method,the micro carfollowing model is transformed into a new continuum *** on a linear stability analysis,the stability conditions of the new continuum model are *** proceed to deduce the modified KdV-Burgers equation of the model in a nonlinear stability analysis,where the solution can be used to describe the propagation and evolution characteristics of the density wave near the neutral stability *** results show that memory time has a negative impact on the stability of traffic flow,whereas the provision of the preceding vehicle's taillight contributes to mitigating traffic congestion and reducing energy consumption.

关键词： memory time preceding vehicle's taillight continuum model stability modified KdV-Burgers equation

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Heterogeneous traffic flow modeling with drivers’ timid and aggressive characteristics

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Chinese Physics B 2021年第10期30卷 219-230页

作者： cong zhai Weitiao Wu Songwen Luo School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China School of Transportation and Civil Engineering and Architecture Foshan UniversityFoshan 528000China

The driver’s characteristics(e.g.,timid and aggressive)has been proven to greatly affect the traffic flow performance,whereas the underlying assumption in most of the existing studies is that all drivers are *** the real traffic environment,the drivers are distinct due to a variety of factors such as personality *** better reflect the reality,we introduce the penetration rate to describe the degree of drivers’heterogeneity(i.e.,timid and aggressive),and proceed to propose a generalized heterogeneous car-following model with different driver’s *** the linear stability analysis,the stability conditions of the proposed heterogeneous traffic flow model are obtained based on the perturbation *** impacts of the penetration rate of drivers with low intensity,the average value and standard deviation of intensity parameters characterizing two types of drivers on the stability of traffic flow are analyzed by *** show that higher penetration of aggressive drivers contributes to traffic flow *** average value has a great impact on the stability of traffic flow,whereas the impact of the standard deviation is trivial.

关键词： heterogeneous car-following model driver characteristic penetration rate stability

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Interpolation and extrapolation with the CALPHAD method

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Journal of Materials Science & Technology 2019年第9期35卷 2115-2120页

作者： Qun Luo cong zhai Dongke Sun Wei Chen Qian Li State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering. Shanghai University & Shanghai Institute of Materials Genome & Materials Genome Institute Shanghai University333 Nanchen RoadShanghai 200444 China School of Mechanical Engineering Southeast UniversityNanjing 211189China Key Laboratory of Power Beam Processing AVIC Manufacturing Technology InstituteBeijing 100024China

It is widely reported that CALPHAD is an extrapolation method when the thermodynamic properties of a multicomponent system are approximated by its *** this work the meaning of the words extrapolation and interpolation is discussed in context of the CALPHAD *** assessing the properties in binary and ternary systems,extrapolation method is indeed often ***,after assessment,the Gibbs energies are in fact interpolated from the lower order systems into the higher order systems in the compositional *** metastable melting temperatures of bcc and hep in Re-W and the liquid miscibility gap in Mg-Zr system are predicted to illustrate the difference between interpolation and extrapolation.

关键词： CALPHAD Interpolation Extrapolation Gibbsenergy

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High performance rotary triboelectric nanogenerator based on wool charge supplementation strategy with low wear

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Science China(Technological Sciences) 2024年第11期67卷 3535-3545页

作者： CAI MingZhe HAO congcong WANG ZeKun zhai cong ZHENG YongQiu XUE ChenYang Key Laboratory of Instrumentation Science&Dynamic Measurement Ministry of Education North University of ChinaTaiyuan030051China

Triboelectric nanogenerator(TENG)is an emerging method for harvesting mechanical *** traditional rotary TENGs(RTENGs),the mutual friction between positive and negative friction materials significantly shortens their operational *** non-contact triboelectric nanogenerator addresses this issue effectively;however,its low output performance still limits practical *** this work,we introduce a novel charge supplementation strategy to enhance the performance of *** strategy involves directly affixing wool between the Cu electrodes of the NCR-TENG,while the negative friction material is modified by doping with MXene,resulting in a substantial enhancement of *** voltage,current,and charge transfer increased by 4.5,4.5,and 4.8 times,respectively,reaching 451 V,21.2μA and 47 ***,NCR-TENG demonstrates remarkable stability,maintaining 100%output characteristics after 33,600 *** output power reaches2.3 mW when load resistance is 107Ω.It takes only 0.8 s to charge a 0.1μF capacitor to 10 *** work not only improves the output performance of the NCR-TENG but also retains the capability of low-speed startup while maintaining high wear *** simple and effective charge supplementation strategy proposed here provides a new perspective for further improving the output characteristics of ***-TENG has potential application prospects in harvesting wind energy to power traffic flow sensor networks,detecting environmental and vehicle information,and optimizing traffic signal control.

关键词： triboelectric nanogenerators charge supplementation strategy high wear resistance wind energy harvesting

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Person Re-identification Across Multiple Non-overlapping Cameras by Grouping Similarity Comparison Model

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Chinese Journal of Electronics 2017年第5期26卷 905-911页

作者： TAN Feigang LIU Weiming HUANG Ling zhai cong SHI Wei LI Yanshan South China University of Technology Shenzhen Institute of Information technology ATR Key Laboratory of Defense Technology Shenzhen University

We propose a novel algorithm to solve the problem of person re-identification across multiple nonoverlapping cameras by grouping similarity comparison *** use an image sequence instead of an image as a probe,and divide image sequence into groups by the method of systematic *** we design the rule which uses full-connection in a group and non-connection between groups to calculate similarities between *** take the similarities as features,and train an Ada Boost classifier to match the persons across disjoint *** enhance Euclidean distance discriminative ability,we propose a novel measure of similarity which is called Significant difference distance(SDD).Extensive experiments are conducted on two public *** proposed person re-identification method can achieve better performance compared with the state-of-the-art.

关键词： Person re-identification Significant difference distance(SDD) Grouping similarity comparison model Across camera tracking Non-overlapping camera views

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An optical tweezer-based microdroplet imaging technology

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Nanotechnology and Precision Engineering 2023年第3期6卷 27-33页

作者： cong zhai Yujian Hong Zuzeng Lin Yulu Chen Han Wang Tong Guo Chunguang Hu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

Microspheres can break the diffraction limit and magnify nano-structure imaging,and with its advantages of low cost and label-free operation,microsphere-assisted imaging has become an irreplaceable tool in the life sciences and for precision ***,the tiny size and limited imaging field of traditional solid microspheres cause difficulties when imaging large sample ***,droplets have similar properties to those of microspheres,with large surface curvature and refractive-index difference from the surrounding environment,and they can also serve as lenses to focus light for observation and *** work has shown that droplets with controllable size can be generated using an optical tweezer system and can be driven by optical traps to move precisely like solid ***,a novel microdroplet-assisted imaging technology based on optical tweezers is proposed that better integrates the generation,manipulation,and utilization of droplets.

关键词： Optical tweezers Photogenerated droplets Assisted imaging Controllable generation

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考虑驾驶员预测特性的带有上匝道的宏观交通流模型

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交通运输系统工程与信息 2020年第4期20卷 119-127,157页

作者：翟聪巫威眺佛山科学技术学院交通与土木建筑学院广东佛山528000 华南理工大学土木与交通学院广州510640

高速公路入口匝道车流对高速公路主路车流存在较大影响,在未来车联网环境下,驾驶员能够获取更为丰富的交通信息,并对下一时段的交通状态做出预判.本文提出考虑有驾驶员预测特性的带有匝道的新格点流体动力学模型.基于线性稳定性分析方法... 详细信息

高速公路入口匝道车流对高速公路主路车流存在较大影响,在未来车联网环境下,驾驶员能够获取更为丰富的交通信息,并对下一时段的交通状态做出预判.本文提出考虑有驾驶员预测特性的带有匝道的新格点流体动力学模型.基于线性稳定性分析方法,得到关于新格点模型的中性稳定性条件;在非线性稳定性分析中,采用还原扰动法推导模型在临界点附近的mKdV(modified Korteweg de Vries)方程,求解方程所得的扭结—反扭结孤立波,可以用于描述交通密度波在中性稳定曲线附近的传播机制.最后,基于仿真算例验证匝道交通流率和驾驶员预测时间对交通流稳定性的重要影响.

关键词：智能交通预测效应格点模型匝道稳定

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考虑鸣笛效应和驾驶员异质性的新格子模型稳定性分析

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自动化学报 2020年第8期46卷 1738-1747页

作者：翟聪巫威眺佛山科学技术学院交通与土木建筑学院佛山528000 华南理工大学土木与交通学院广州510641

道路环境及密集交通流随机波动是交通扰动的诱因,文中考虑道路环境中的汽车鸣笛效应和驾驶员异质性的影响,提出鸣笛发生临界密度的概念,建立了更符合实际的格子流体动力学模型,并揭示非饱和交通状态下诱发交通流失稳的机理.在线性稳定... 详细信息

道路环境及密集交通流随机波动是交通扰动的诱因,文中考虑道路环境中的汽车鸣笛效应和驾驶员异质性的影响,提出鸣笛发生临界密度的概念,建立了更符合实际的格子流体动力学模型,并揭示非饱和交通状态下诱发交通流失稳的机理.在线性稳定性分析中利用扰动法得到了该模型的稳定性条件,并基于还原微扰法对该模型的非线性稳定性问题进行研究,通过求解mKDV方程获取的扭结–反扭结孤立波描述了在临界点附近密度波的传输规则.仿真结果表明,考虑有鸣笛效应的新格子模型相比于Nagatani模型的稳定性更强,而较大的临界密度对交通流稳定性存在消极影响;与以往微观模型相比,本文模型能解释鸣笛现象发生的自然条件,即密度高且流量低的地方,同时驾驶员特性也对交通流的稳定性存在着显著影响.

关键词：交通流格子模型稳定性分析鸣笛效应驾驶员异质性临界密度

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Modeling continuous traffic flow with the average velocity effect of multiple vehicles ahead on gyroidal roads

Digital Transportation and Safety

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Digital Transportation and Safety 2023年第2期2卷 124-138页

作者： cong zhai Weitiao Wu Yingping Xiao School of Transportation and Civil Engineering and Architecture Foshan UniversityFoshan 528000GuangdongChina School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641GuangdongChina

In the future connected vehicle environment,the information of multiple vehicles ahead can be readily collected in real-time,such as the velocity or headway,which provides more opportunities for information exchange and cooperative ***,gyroidal roads are one of the fundamental road patterns prevalent in mountainous *** effectively control the system,it is therefore significant to explore the evolution mechanism of traffic flow on gyroidal roads under a connected vehicle *** this paper,we present a new continuum model with the average velocity of multiple vehicles ahead on gyroidal *** stability criterion and KdV-Burger equation are deduced via linear and nonlinear stability analysis,*** the above KdV-Burger equation yields the density wave solution,which explores the formation and propagation property of traffic jams near the neutral stability *** examples verify that the model can reproduce complex phenomena,such as shock waves and rarefaction *** analysis of the local cluster effect shows that the number of vehicles ahead and the radius information,and the slope information of gyroidal roads can exert a great influence on traffic *** effect of the first and second terms are positive,while the last term is negative.

关键词： Average velocity of multiple vehicles ahead Gyroidal roads Continuum model Stability KdV-Burger equation

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