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Human movement monitoring and behavior recognition for intelligent sports using customizable and flexible triboelectric nanogenerator

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Science China(Technological Sciences) 2022年第4期65卷 826-836页

作者： YANG Yun HOU XiaoJuan GENG WenPing MU JiLiang ZHANG Le WANG XiangDong he Jian XIONG Ji jun CHOU XiuJian Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China Department of Mining Engineering Luliang UniversityLvliang 033000China Physical Education Institute Jimei UniversityXiamen 361021China

Effective collection,recognition,and analysis of sports information is the key to intelligent sports,which can help athletes to improve their skills and formulate scientific training plans and competition *** present,wearable electronic devices used for movement monitoring still have some limitations,such as high cost and energy consumption,incompatibility of suitable flexibility and personalized spatial structure,dissatisfactory data analysis methods,*** this work,a novel three-dimensionalprinted thermoplastic polyurethane is introduced as the elastic shell and friction layer,and it endows the proposed customizable and flexible triboelectric nanogenerator(CF-TENG)with personalized spatial structure and robust correlation to external *** practical application,it exhibits highly sensitive responses to the joint-bending motion of the finger,wrist,or ***,a pressure-sensing insole and smart ski pole based on CF-TENG are manufactured to build a comprehensive sports monitoring system to transmit the athletes’motion information from feet and hands through the plantar pressure distribution and ski pole *** recognize the movement status,the self-developed automatic peak recognition algorithm(P-Find)and machine learning algorithm(subspace K-Nearest Neighbors)were introduced to accurately distinguish the four typical motion behaviors and three primary sub-techniques of cross-country skiing,with accuracy rates of 98.2%and 100%.This work provides a novel strategy to promote the personalized applications of TENGs in intelligent sports.

关键词： triboelectric nanogenerator flexible movement monitoring behavior recognition intelligent sports

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椭圆轨迹对超声波椭圆振动切削的影响

制造业自动化 2013年第2期35卷 43-47页

作者：何俊邓成军四川大学制造科学与工程学院成都610065

运用有限元仿真技术,从影响椭圆轨迹的参数入手,模拟了不同椭圆轨迹下TC4钛合金超声波椭圆振动切削过程,得到了不同椭圆轨迹下切削力和切削温度的变化曲线。经过对比分析,结果表明TC4钛合金超声波椭圆振动切削切削力、切削温度随相位差... 详细信息

运用有限元仿真技术,从影响椭圆轨迹的参数入手,模拟了不同椭圆轨迹下TC4钛合金超声波椭圆振动切削过程,得到了不同椭圆轨迹下切削力和切削温度的变化曲线。经过对比分析,结果表明TC4钛合金超声波椭圆振动切削切削力、切削温度随相位差增大先减小后增大,切削力随切削方向、切屑流出方向振幅和振动频率的增大而减小,而切削温度随切削方向振幅增大而增大,随切屑流出方向振幅、振动频率增大而减小。

关键词：超声波椭圆振动切削相位差振幅振动频率

A meteorologically adjusted ensemble Kalman filter approach for inversing daily emissions:A case study in the Pearl River Delta,China

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Journal of Environmental Sciences 2022年第4期34卷 233-248页

作者： Guanglin Jia Zhijiong Huang Xiao Tang Jiamin Ou Menghua Lu Yuanqian Xu Zhuangmin Zhong Qing’e Sha Huangjian Wu Chuanzeng Zheng Tao deng Duohong Chen Min he junyu Zheng School of Environment and Energy South China University of TechnologyUniversity Town CampusGuangzhou 510006China Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511486China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Faculty of Social and Behavioural Sciences Utrecht UniversityUtrechtCH 3584the Netherlands Guangzhou Institute of Tropical and Marine Meteorology China Meteorological AdministrationGuangzhou 510640China State Environmental Protection Key Laboratory of Regional Air Quality Monitoring Guangdong Environmental Monitoring CenterGuangzhou 510308China Department of Environmental Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China

The conventional Ensemble Kalman filter(EnKF),which is now widely used to calibrate emission inventories and to improve air quality simulations,is susceptible to simulation errors of meteorological inputs,making accurate updates of high temporal-resolution emission inventories *** this study,we developed a novel meteorologically adjusted inversion method(MAEInv)based on the EnKF to improve daily emission *** new method combines sensitivity analysis and bias correction to alleviate the inversion biases caused by errors of meteorological *** demonstration,we used the MAEInv to inverse daily carbon monoxide(CO)emissions in the Pearl River Delta(PRD)region,*** the case study,60%of the total CO simulation biases were associated with sensitive meteorological inputs,which would lead to the overestimation of daily variations of posterior *** the new inversion method,daily variations of emissions shrank dramatically,with the percentage change decreased by 30%.Also,the total amount of posterior CO emissions estimated by the MAEInv decreased by 14%,indicating that posterior CO emissions might be overestimated using the conventional *** evaluations using independent observations revealed that daily CO emissions estimated by MAEInv better reproduce the magnitude and temporal patterns of ambient CO concentration,with a higher correlation coefficient(R,+37.0%)and lower normalized mean bias(NMB,-17.9%).Since errors of meteorological inputs are major sources of simulation biases for both low-reactive and reactive pollutants,the MAEInv is also applicable to improve the daily emission inversions of reactive pollutants.

关键词： Emission inversion Daily emissions Meteorological adjustment Ensemble Kalman filter

Identification of differential proteins in colorectal cancer cells treated with caffeic acid phenethyl ester

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World Journal of Gastroenterology 2014年第33期20卷 11840-11849页

作者： Yu-jun he Wan-Ling Li Bao-Hua Liu Hui Dong Zhi-Rong Mou Yu-Zhang Wu Institute of Immunology of PLA the Third Military Medical University Department of General Surgery Daping Hospital and Research Institute of Surgery the Third MilitaryMedical University

AIM: To investigate the molecular mechanisms of the anti-cancer activity of caffeic acid phenethyl ester (CAPE).

关键词： Caffeic acid phenethyl ester Colorectal cancer Proteomics Two-dimensional electrophoresis Mass spectrometry

A theory for three-dimensional response of micropolar plates

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1403-1414页

作者： Dianwu HUANG Linghui he College of Civil Engineering and Architectural Jiaxing UniversityJiaxing 314001Zhejiang ProvinceChina Department of Modern Mechanics and State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

Through combined applications of the transfer-matrix method and asymptotic expansion technique,we formulate a theory to predict the three-dimensional response of micropolar *** ad hoc assumptions regarding through-thickness assumptions of the field variables are made,and the governing equations are two-dimensional,with the displacements and microrotations of the mid-plane as the *** the deformation of the mid-plane is solved,a three-dimensional micropolar elastic field within the plate is generated,which is exact up to the second order except in the boundary region close to the plate *** an illustrative example,the bending of a clamped infinitely long plate caused by a uniformly distributed transverse force is analyzed and discussed in detail.

关键词： micropolar plate transfer-matrix asymptotic expansion three-dimensional response

DYNAMIC PORTFOLIO CHOICE UNDER The TIME-VARYING,JUMPS,AND KNIGHT UNCERTAINTY OF ASSET RETURN PROCESS

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Journal of Systems Science & Complexity 2012年第5期25卷 896-908页

作者： Chaolin he Weidong MENG School of Management Engineering Anhui Polytechnic University College of Economics and Business Administration Chongqing University

By introducing a stochastic element to the double-jump diffusion framework to measure the Knight uncertainty of asset return process, this paper builds the model of dynamic portfolio choice, which maximizes the expected utility of terminal portfolio wealth. Through specifying the state function of uncertainty-aversion, it utilizes the max-min method to derive the analytical solution of the model to study the effect of the time-varying, jumps, and Knight uncertainty of asset return process on dynamic portfolio choice and their interactions. Results of comparative analysis show： The time-varying results in positive or negative intertemporal hedging demand of portfolio, which depends on the coefficient of investor＇s risk aversion and the correlation coefficient between return shift and volatility shift; the jumps in asset return overall reduce investor＇s demand for the risky asset, which can be enhanced or weakened by the jumps in volatility; due to the existing of the Knight uncertainty, the investor avoids taking large position on risky asset, and the resulting is the improving of portfolio＇s steady and immunity. At last, an empirical study is done based on the samples of Shanghai Exchange Composite Index monthly return data from January 1997 to December 2009, which not only tests the theoretical analysis but also demonstrates that the proposed method in the paper is useful from the aspect of portfotio＇s equivalent utility.

关键词： Conditional characteristic function dynamic portfolio jumps Knight uncertainty spec-tral generalized method of moments time-varying.

Dynamic Modeling for Gas-Electricity Combined Systems with Wind Power and its Stability Control

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2386-2393页

作者： Rui Ma Pingping he Changsha University of Science&Technology Changsha 410114China

The micro turbine(MT)is scheduled to address wind power uncertainties and thus lead to greater variations in the state of natural gas system(NGS).To meet this challenge,first,a dynamic model of a gas-electricity combined system with wind power is established,the dynamic model of the NGS is based on differential equations,so that it can easily connect with the MT model;and a droop control module is added to the Rowen's MT model,so that the improved model can adjust the output power according to the scheduling ***,a stability control method based on the variable regulation ratio gas pressure regulator is proposed,the essence of this method is to reduce the variation of natural gas storage in the gas pipeline,so as to ensure the stability of *** simulation results show that the dynamic model is correct and the stability control method is effective.

关键词： Dynamic behaviors integrated energy system stability control method wind power

ZnMn_(3)O_(7):A New Layered Cathode Material for Fast-Charging Zinc-Ion Batteries

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Chinese Journal of Structural Chemistry 2022年第5期41卷 85-92页

作者： Ruitao Sun Qin Liu Wenzhuo deng CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsState Key Laboratory of Structural ChemistryFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100039China

Low-cost and high-energy-density manganese-based compounds are promising cathode materials for rechargeable aqueous zinc-ion batteries(AZIBs),however,they often experience cycling instability issues and inferior rate ***,we report a new layered manganese-based cathode material,ZnMn_(3)O_(7)(ZMO),which possesses a large interlayer spacing of 4.8Åand allows the intercalation of~1.23 Zn-ions per formula unit(corresponding to a capacity of~170 mAh/g).Importantly,ZMO exhibits good cycling stability(72.9%capacity retention over 400 cycles),ultrafast-charging capability(73%state of charge in 1.5 min),and an ultrahigh power density(3510 W/kg at 88 Wh/kg).Through kinetic characterization,the favorable diffusion of ions and the dominant capacitor contribution are found to be conducive to the achievement of superior fast charging ***,the charge storage mechanism is revealed by ex-situ XRD and ex-situ *** work may shed light on the design of high-performance electrode materials for AZIBs.

关键词： layered structure zinc-manganese oxide cathode zinc-ion battery

Splitting of Operators and Operator Equations

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Acta Mathematica Sinica,English Series 2023年第6期39卷 1085-1100页

作者： Chun Yuan deng Wan Yu ZHANG School of Mathematics Science South China Normal UniversityGuangzhou 510631P.R.China

In this paper,we consider the splitting operators into the product of two positive *** given operators A and T∈B(H)with A≥0 and R(A)=R(T),if T can be splitted as T=AX for some positive operator X,then the existence of X and the properties of T are *** related research are the solutions of operator equations T=XAX and TX=XAX,which have some particular properties and broad applications in many *** conditions for the existence of solutions or idempotent solutions of these kinds of equations are studied and new representations of the general solutions are given.

关键词： Projection positive operator operator equation Moore-Penrose inverse