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Wearable Leg Movement Monitoring System for High-Precision Real-Time Metabolic Energy Estimation and Motion Recognition

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Research 2024年第2期2023卷 417-429页

作者： Jinfeng Yuan Yuzhong Zhang shiqiang liu Rong Zhu State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Comprehensive and quantitative assessment of human physical activity in daily life is valuable for healthcare,especially for those who suffer from obesity and neurological disorders or are at high risk of *** wearable devices,e.g.,smartwatches,are insufficient and inaccurate for monitoring highly dynamic limb movements and assessing human ***,we report a new wearable leg movement monitoring system incorporating a custom-made motion sensor with machine learning algorithm to perceive human motion accurately and comprehensively during diverse walking and running *** system enables real-time multimodal perceptions of personal identity,motion state,locomotion speed,and energy expenditure for wearers.A general law of extracting real-time metabolic energy from leg movements is verified although individual gaits show *** addition,we propose a novel sensing configuration combining unilateral lower leg movement velocity with its angular rate to achieve high accuracy and good generalizability while simplifying the wearable *** performances in personal identification(accuracy of 98.7%)and motion-state recognition(accuracy of 93.7%)are *** wearable system also exhibites high-precision real-time estimations of locomotion speed(error of 3.04%to 9.68%)and metabolic energy(error of 4.18%to 14.71%)for new subjects across various time-varying *** wearable system allows reliable leg movement monitoring and quantitative assessment of bodily kinematic and kinetic behaviors during daily activities,as well as safe identity authentication by gait parameters,which would greatly facilitate smart life,personal healthcare,and rehabilitation training.

关键词： smart enable monitoring

Effect of Supersonic Fine Particles Bombarding on the Service Life of Thermal Barrier Coating

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 911-916页

作者： LIN Xiaoping DONG Yun WANG Zhiping liu shiqiang REN Zhimin DING Kunying Department of Materials Science and Engineering Northeastern Universi（y at Qinhuangdao Qinhuangdao 066004 China College of Science Civil Aviation University of China Tianjin 300300 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China

Thermally Grown Oxide（TGO） is a dominating component in controlling the effectiveness of thermal barrier *** the growth of TGO,whether we could homogeneously distribute Al atom on the TGO and the intermediate metal layer will be the key factor in forming TGO with continuous,uniform and single-ingredient（Al2O3）.In this experiment,we bombarded particles on to the metallic bound *** studied the influence of supersonic particle bombardment on the diffusion of *** hope to control the growth of TGO by monitoring the diffusion of *** barrier coating（TBC）,which consists of a NiCoCrAlY bond coat and a ZrO2-8Y2O3（wt.%） topcoat（TC）,is fabricated on the nickel-base superalloy by air plasma spray（APS）.NiCoCrAlY bond coat is treated by supersonic fine particles bombarding（SFPB）.The morphology,oxidation behavior of TBC and phase are characterized by scanning electron microscope（SEM） equipped with an energy dispersive spectromrter（EDS） and X-ray diffractometer（XRD）.The influence of supersonic fine particles bombarding technique on the service life of thermal barrier coating is *** results show that SFPB technique improves the flaw of excessive surface undulation in the as-sprayed bond coat.A continuous,uniform and single-ingredient（Al2O3） TGO can quickly form in the SFPB TBC during high temperature oxidation *** thickening of TGO is relatively *** will effectively suppress the formation of other non-protective ***,SFPB technique reduces the growth stress level generated by the continuous growth of TGO,and also avoids the stress concentration induced by formation of the large particle spinal *** barrier coating still remains well after 350 thermal *** service life of TBC is *** proposed research provides theoretical basis and technical references to further improve and enhance the SFPB technique.

关键词： thermal barrier coating stress concentration supersonic fine particles bombarding thermally grown oxide

Identification and Characterization of Tonoplast Sugar Transporter (TST) Gene Family in Cucumber

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Horticultural Plant Journal 2020年第3期6卷 145-157页

作者： Weifeng Huang Bin Hu Jialin liu Yong Zhou shiqiang liu National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of EducationJiangxi Agricultural UniversityNanchang 330045China College of Bioscience and Bioengineering Jiangxi Agricultural UniversityNanchang 330045China

Tonoplast sugar transporters(TSTs)play essential roles in regulating plant growth,development,and response to various biotic and abiotic *** this study,a total of three TST genes were identified by a genome-wide analysis in *** analysis showed that TST proteins from cucumber and other plant species can be classified into five groups,and nearly all TST members in the same groups displayed similarmotif distributions,transmembrane(TM)domains,and gene *** of the three CsTST genes possess a number of development-,stress-,and hormone-related cis-elements in the promoter ***,qRT-PCR assays revealed that the CsTST1 was expressed in fruits,flowers,leaves,and other tissues,and its expression varied significantly under various abiotic stresses such as cold,salt,drought(PEG),and abscisic acid(ABA).Finally,functional analysis of CsTST1 in yeast revealed that it was able to complement the deficiency in galactose,mannose and sucrose *** results revealed that CsTST1 can act as a functional sugar transporter to play important roles in cucumber growth and response to abiotic stress probably through affecting carbohydrate distribution.

关键词： Cucumber Cucumis sativus L. TST Phylogenetic analysis Gene expression Abiotic stress Sugar transport

Study about thermal runaway behavior of high specific energy density Li-ion batteries in a low state of charge

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Journal of Energy Chemistry 2021年第1期30卷 20-27,I0002页

作者： shiqiang liu Tianyi Ma Zhen Wei Guangli Bai Huitian liu Dapeng Xu Zhongqiang Shan Fang Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Evaluation Technology for Electric Vehicles China Automotive Technology and Research Center Co.Ltd.(CATARC)Tianjin 300300China

Lithium-ion batteries are widely used in electric vehicles and electronics, and their thermal safety receives widespread attention from consumers. In our study, thermal runaway testing was conducted on the thermal stability of commercial lithium-ion batteries, and the internal structure of the battery was analyzed with an in-depth focus on the key factors of the thermal runaway. Through the study of the structure and thermal stability of the cathode, anode, and separator, the results showed that the phase transition reaction of the separator was the key factor affecting the thermal runaway of the battery for the condition of a low state of charge.

关键词： Lithium-ion battery Thermal runaway State of charge Thermal stability

Effect of Preload Force on Heat Generation of Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)/SiO_(x)-C System Batteries:The Discharge Process

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Journal of Thermal Science 2024年第5期33卷 1809-1825页

作者： LIN Chunjing LAI Zhenxing BAI Guangli MA Biao WEI Zhen QI Chuang liu shiqiang Key Laboratory of Advanced Manufacturing Technology for Automobile Parts Ministry of EducationChongqing University of TechnologyChongqing 400054China China Auto Research New Energy Vehicle Inspection Center(Tianjin)Co Tianjin 300300China

Lithium-ion batteries(LIBs)undergo various degradation phenomena such as material decomposition,structural change and uneven lithium ion distribution during long-term cycles,which would affect their performance and *** order to improve the performance of the LIBs during their life cycle,preload force is preset when the batteries are *** preload forces will in turn affect the cycle life and heat generation of the *** order to address this issue,this work carries out charge/discharge cycle tests on a NCM811 battery under different preload *** calorimetry tests are performed to investigate the battery heat generation under different states of health(SOHs)and preload *** on the test results,an empirical prediction model for heat generation power as a function of SOH is *** show that when the preload force is 5 N·m,the battery capacity decreases in the slowest rate and the average heat generation power is the *** in peaks of the incremental capacity curve can be used to characterize the loss of lithium at the electrode,which in turn characterizes the change of heat generation power of the *** average heat generation power is mainly affected by the SOH,going through a period of trough with the decrease of the SOH and continuing to increase after crossing the critical *** general,these findings emphasize the relationship between preload force,SOH and heat generation power,which is helpful for the judgment of optimal preload to improve the efficiency of LIBs.

关键词： lithium ion battery cyclic aging preload force heat generation characteristic

Comparative Study on Traction Battery Charging Strategies from the Perspective of Material Structure

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Automotive Innovation 2022年第4期5卷 427-437页

作者： Mengyang Gao Liduo Chen Tianyi Ma Weijian Hao Zhipeng Sun Yuhan Sun shiqiang liu China Automotive Technology and Research Center Co.Ltd Tianjin 300300China CAT ARC NEV Test Center(Tianjin)Co.Ltd Tianjin 300300China

The service life of an electric vehicle is,to some extent,determined by the life of the traction battery.A good charging strat-egy has an important impact on improving the cycle life of the lithium-ion ***,this paper presents a comparative study on the cycle life and material structure stability of lithium-ion batteries,based on typical charging strategies currently applied in the market,such as constant current charging,constant current and constant voltage charging,multi-stage constant current charging,variable current intermittent charging,and pulse *** with the reference charging strategy,the charging capacity of multi-stage constant current charging reaches 88%.Moreover,the charging time is reduced by 69%,and the capacity retention rate after 500 cycles is 93.3%.Through CT,XRD,SEM,and Raman spectroscopy analysis,it is confirmed that the smaller the damage caused by this charging strategy to the overall structure of the battery and the layered structure and particle size of the positive electrode material,the higher the capacity retention rate *** work facilitates the development of a better charging strategy for a lithium-ion battery from the perspective of material structure.

关键词： Traction battery Charging strategy Cycle life Material evolution

Minimizing makespan of a production batch within concurrent systems:Seru production perspective

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Journal of Management Science and Engineering 2022年第1期7卷 1-18页

作者： Yin Gai Yong Yin Jiafu Tang shiqiang liu College of Management Science and Engineering Dongbei University of Finance and EconomicsDalian116025China Graduate School of Business Doshisha UniversityKyoto602-8580Japan School of Economics and Management Fuzhou UniversityFuzhou350108China

This paper discusses the makespan minimization of a production batch within a specific concurrent system,seru production system.A seru production system consists of multiple independent serus.A seru is a compact assembly origination in which products are assembled from-the-beginning-to-the-end without *** capability of a seru production system is its responsiveness.A performance measure used to evaluate a seru system’s responsiveness is the makespan of production batches assembled within the seru *** study addresses the makespan minimization problem through an optimal seru loading *** problem is formulated as a min-max integer optimization *** exact dimension-reduction Algorithm is developed to obtain the optimal allocation that minimizes the *** show that the solution space increases very *** contrast,our algorithm is efficient with a polynomial computational complexity of,where is the total number of serus in a seru *** verify the usefulness of the developed exact dimension-reduction algorithm,we compare it with a widely practiced greedy algorithm through *** find that our optimal algorithm is robust in most cases and the greedy algorithm is efficient when variability in production efficiencies is *** result can guide us to adopt different algorithms in different business *** the variability in production efficiencies is high,e.g.,new employees and/or new products assembly,the greedy algorithm is *** other cases,our optimal algorithm should be adopted to obtain the minimum *** also extend the method to the application of a rotating seru.

关键词： Assembly Greedy algorithm Dimension reduction Exact algorithm Variability Polynomial computational complexity

Study on influencing factors of ion current density measurement in corona discharge of HVDC transmission lines

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Plasma Science and Technology 2020年第4期22卷 1-7页

作者： shiqiang liu Shouzheng LI Yuze JIANG Nan JIANG Jie LI Yan WU School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China State Grid Shandong Electric Power Research Institute Jinan 250003People's Republic of China

The ground level ion current density produced by corona discharge in high voltage direct current(HVDC)transmission lines can reflect the operation status of the lines,but the distorted electric field at the edge of the Wilson plate seriously affects the measurement results of ion current *** order to measure the ground level ion current density accurately and directly,a new reduced scale wire-plate experimental device in which the Wilson plate is flush with the grounding plate is *** influence of protective annulus width and the height of the Wilson plate from the grounding plate on ground level ion current density are *** addition,the differences between the micro-current galvanometer method and the sampling resistance method in the measurement of ion current density are ***,the ground level ion current density distributions of unipolar and bipolar HVDC transmission lines are *** results show that the edge effect of the Wilson plate can be neglected when the width of protective annulus is less than 2 mm,and the ion current density is nonlinear with the height of the Wilson plate from the grounding ***,the internal resistance of the digital voltmeter seriously affects the measurement results and it is necessary to correct the ***,at the same applied voltage,the ground level ion current density in the negative conductor region is higher than that in the positive conductor region.

关键词： HVDC corona discharge reduced scale device Wilson plate ion current density

The Global Security Initiative: Its Relevance, Rationale and Delivery

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Contemporary World 2024年第2期 34-38页

作者： liu shiqiang School of Marxism at Southwestern University of Finance and Economics

Today,our world is undergoing profound changes unseen in a *** security landscape is becoming ever more unstable and *** the face of growing deficits in security,Chinese President Xi Jinping put forward the Global Security Initiative(GSI),offering a clear answer to the question of the times:what kind of security concept does the world need,and how can we achieve common security?It is of great significance to fully grasp the relevance of and the rationale for the GSI,and push for its strategic delivery,so as to contribute to the long-term peace and stability of the world.

关键词： Rational offering rational