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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Liao, Haisu Wang, Yidi Shi, Qiuyu Huang, Ruisen Gao, Fei Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy System

ISBN: (纸本)9798350320831

The concept of extracting energy from the human body to recharge depleted energy sources has gained significant attention. Recently, scientists have focused on harnessing biomechanical energy from the human body while walking. The aim of this study is to optimize a piezoelectric bending beam-based human knee energy harvester to enhance performance. Specifically, the shape of the bending beam (the substrate: a carbon fiber plate) is optimized to modulate the deformation, such that the average strain of the piezoelectric macro fiber composites (MFC) attached to the bending beam is improved to generate more electricity. In addition, the effects of the substrate's thickness and the hinge base's height for the bending beam on the output power are also analyzed. Experimental testing on a subject is conducted to validate our design and test the performance. The harvester generates an average power output of 24.55 mW when walking at 4 km/h on a treadmill. The harvester's total weight is 278g. © 2023 IEEE.

关键词： Energy harvesting

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Thermal safety of dendritic lithium against non-aqueous electrolyte in pouch-type lithium metal batteries

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Journal of Energy Chemistry 2022年第9期31卷 158-165,I0005页

作者： Feng-Ni Jiang Shi-Jie Yang Xin-Bing Cheng Peng Shi Jun-Fan Ding Xiang Chen Hong Yuan Lei Liu Jia-Qi Huang Qiang Zhang College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211189JiangsuChina Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

A quantitative relationship between safety issues and dendritic lithium(Li) has been rarely investigated yet. Herein the thermal stability of Li deposits with distinct surface area against non-aqueous electrolyte in pouch-type Li metal batteries is probed. The thermal runaway temperatures of Li metal batteries obtained by accelerating rate calorimeter are reduced from 211 ℃ for Li foil to 111 ℃ for cycled *** initial exothermic temperature is reduced from 194 ℃ for routine Li foil to 142 ℃ for 49.5 m~2g^(-1) dendrite. Li with different specific surface areas can regulate the reaction routes during the temperature range from 50 to 300 ℃. The mass percent of Li foil and highly dendritic Li reacting with ethylene carbonate is higher than that of moderately dendritic Li. This contribution can strengthen the understanding of the thermal runaway mechanism and shed fresh light on the rational design of safe Li metal batteries.

关键词： Pouch-type cell Battery safety Lithium metal anode Lithium dendrite growth Thermal runaway

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Effect of Doping on the Morphology and Dimethylamine Gas Sensing Properties of Hexagonal Pine Needle-Like Wo3 Structures with Highly Exposed (100) Facet

SSRN

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SSRN 2023年

作者： Li, Xin Wan, Ziyuan Hu, Qixuan Yi, Nanxin Guan, Rongfeng Yue, Lu Zhang, Wenhui Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu224051 China

Novel hexagonal pine needle-like Sn-WO3 structures were synthesized using the hydrothermal method. The present study aimed to evaluate the impact of Sn/W ratios and the introduction of several metal elements (Fe, Zn, Cu, and In) on both the morphology and gas sensing properties of WO3. The hexagonal pine needle-like 1% Sn-WO3 sensor had a significantly elevated response of 89 and a faster response/recovery time of 11/15 s when exposed to 10 ppm dimethylamine (DMA) at the optimal operating temperature of 180 oC. This sensor displayed notable characteristics such as excellent selectivity, repeatability, long-term stability and a detection limit of 100 ppb. The excellent sensing performances of this sensor can be attributed to their highly (100) facet, abundant defective oxygen, and distinctive hexagonal pine needle-like morphology. © 2023, The Authors. All rights reserved.

关键词： Tungsten compounds

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Synthesis of Hierarchical Sno2 Structures Assembled by Willow-Like Porous Nanosheets with Enhanced Gas-Sensing Performance

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SSRN 2023年

作者： Zhang, Wenhui Kong, Meng Li, Xin Ma, Junyao Cheng, Shui Guan, Rongfeng Yue, Lu Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu224051 China

A simple hydrothermal method aided by sodium dodecylbenzene sulfonate (SDBS) was used to successfully synthesize novel hierarchical SnO2 structures assembled by porous willow-like nanosheets. The effect of SDBS at various concentrations on the structure and morphology of SnO2 was studied. The gas sensor based on hierarchical SnO2 structures assembled by porous willow-like nanosheets prepared with 0.375 g SDBS has the highest response (Ra/Rg) of 35.4 to 50 ppm ethanol at a low operating temperature of 180 oC, which is nearly twice that of SnO2 microflowers prepared without SDBS. The sensor based on hierarchical SnO2 structures assembled by porous willow-like nanosheets has a short response/recovery time (30 s and 9 s), good selectivity, excellent repeatability, and long-term stability to ethanol. The unique hierarchical porous structures, abundant oxygen defects, and large specific surface area of the hierarchical SnO2 structures may account for their excellent gas sensing properties. © 2023, The Authors. All rights reserved.

关键词： Ethanol

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Attention-enhanced BLSTM Network for Liquid Volume Estimation based on Tactile Sensing

Attention-enhanced BLSTM Network for Liquid Volume Estimatio...

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Su, Yuanzhe Wang, Jingnan Huang, Binhua Li, Xiaoyu Liu, Yiwen Liu, Chengliang Zhou, Zhenning Yi, Zhengkun Wu, Xinyu Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China Shenzhen Institute of Artificial Intelligence and Robotics for Society Siat Branch Shenzhen518055 China

ISBN: (纸本)9798350327182

The task of liquid volume estimation based on tactile sensing is challenging. Previous researches mainly focused on the classification of different contents in the container, rather than achieving accurate estimation of a certain property of the contents in container, such as volume or viscosity. In addition, few studies are conducted for the regression task with advanced tactile sensors, but the performance is unsatisfactory. We propose a new deep-learning algorithm for processing the tactile signals collected from the photoresistors in the task of liquid content estimation. The proposed algorithm doesn't need hand-crafted features. In addition, we use attention after BLSTM, so that more important features can be selected to achieve better performance for liquid volume estimation. We utilize a bi-directional Long Short-Term Memory (BLSTM) architecture, which allows for the incorporation of information from both preceding and subsequent time, thereby providing a more comprehensive and informative feature set for learning. Additionally, we employ an attention mechanism following the BLSTM, allowing for the selection of more critical features and improved performance in liquid volume estimation. To prove the effectiveness of our method, we conduct experiments utilizing tactile sensors on a physical robot, achieving superior performance in liquid volume estimation. © 2023 IEEE.

关键词： Containers

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The key Role of Subtle Substitution for a High-Performance Ester-Modified Oligothiophene-Based Polymer Used in Photovoltaic Cells

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Chinese Journal of Chemistry 2022年第24期40卷 2867-2874页

作者： Sunsun Li Yuan Ding Lei Xu Wenchao Zhao Jianqi Zhang Jinzhao Qin Yuyang Zhang Jingjing Zhao Chang He Qiming Peng Jianhui Hou Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)NanjingJiangsu211816 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjingJiangsu210037 China State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190 China Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing100190 China Jiangsu Seenbom Flexible Electronics Institute Co.Ltd NanjingJiangsu210043 China

In organic solar cells (OSCs), developing high-performing easily synthesized photoactive materials is essential for pursuing cost- effective balance. Herein, we have designed and synthesized a pair of wide-band-gap polymers (PBDE4T-0F and PBDE4T-2F), using the low synthesis cost dicarboxylic ester-substituted quaterthiophene as the building block. Despite the minor change of molecular structure for polymer PBDE4T-xF, the fluorine substituent in polymer PBDE4T-2F greatly enhances its interchain aggregation. The higher aggregation tendency of ester-modified polymer in solution is beneficial for reducing both the aggregate size and π-π stacking distance of blend film, which contribute to the highly efficient exciton dissociation and symmetric charge transport. An impressive power-conversion efficiency (PCE) of 16.1% is achieved for the PBDE4T-2F:BTP-eC9-based device, while its counterpart only delivers a PCE of 5.8% with distinctly lower short-circuit current density (J_(sc)) and fill factor. Notably, the aggregation effect of donor polymer has also been found to be associated with the energy level shifts, and thus the variation of charge transfer energy and voltage losses for blend system. The results suggest that simultaneously reduced voltage loss and increased J_(sc) can be expected by further finely tuning the aggregation behavior of the ester-modified oligothiophene-based donor polymer.

关键词： Organic solar cells Polymers Ester-modified oligothiophene Fluorine Aggregation

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FLAPWISE BENDING VIBRATIONS OF ROTATING AXIALLY FUNCTIONALLY GRADED VARIABLE SECTION BEAMS 1

FLAPWISE BENDING VIBRATIONS OF ROTATING AXIALLY FUNCTIONALLY...

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1st International Conference on Mechanical System Dynamics, ICMSD 2022

作者： Yin, Bo Fang, Jianshi School of Materials Science and Engineering Nanjing Institute of Technology Nanjing China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

Free flapwise bending vibrations of rotary axially functionally graded (FG) beams with non-uniform cross-section are presented according to the Euler-Bernoulli beam theory. The dynamic equations are derived from the second-kind Lagrange's equations, in which the potential and kinetic energy functions are described by using a set of hybrid deformation variables. The modal characteristics are calculated from the dimensionless eigenvalue equation by the assumed mode approach. The accuracy and effectiveness of the proposed approach are confirmed by comparative and convergence studies. The effects of dimensionless parameters, such as the taper ratios of height and breadth,the hub radius ratio, the angular velocity, and the material gradient parameter, on mode shapes and natural frequencies of tapered rotary beams with axially varying Young's modulus and mass density are studied in detail. The numerical results presented in this work are benefit to the optimization design of rotating tapered non-homogeneous beams. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Kinetic energy

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Enhancing the creep resistance in a RE-free cast Mg-Al-Ca alloy through microalloying of Ti

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Journal of Magnesium and Alloys 2025年第1期13卷 414-428页

作者： Zhuang Cui Yang Liu Ying Zeng Manping Liu Xiaochun Liu Shiwei Xu Xuefei Chen Qudong Wang School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

High temperature performance of magnesium alloys can be tailored by either grain size or precipitates in the grain *** this study,exceptional creep resistance was successfully acquired in a RE-free cast Mg-Al-Ca-Ti(AC51Ti)*** of Ti(0.01 wt.%)has been found to be beneficial to the improvement of the tensile creep resistance in a RE-free cast Mg-5Al-0.35Mn-(1Ca)(AC51)alloy,showing a low state creep rate(SCR)of 2.70×10^(−9)s^(−1)at 200℃/50 MPa,which is even better than that of many reported RE-containing Mg *** presence of trace Ti contributes to the substantial refinement and more uniform distribution of Al_(2)Ca precipitates in the *** the same time,the microalloying of Ti improves the solubility of Al and Ca in the *** is reasonable to believe that the microalloying of Ti induced re-organization of Al_(2)Ca precipitates,dissolved a larger amount of Al and Ca atoms into magnesium lattice,and increased the possibility of interaction between GB/dislocations and precipitates,which strongly correlates with the high temperature *** creep strengthening mechanisms primarily attributed to both second phase strengthening and solid solution strengthening were separately proposed based on the experimental investigations.

关键词： Magnesium alloy Creep mechanisms Al_(2)Ca phase Microalloying of Ti

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Synergy of Alloy and Ligand for Co2 Hydrogenation to Formic Acid on Pdau/Hpc-Ap

SSRN

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SSRN 2024年

作者： Wang, Zhenzhen Liu, Encheng Sun, Zhonghua Zhang, Zhihui He, Mingyang Chen, Qun Qian, Junfeng Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Jiangsu Changzhou213164 China

Formic acid (FA) is of great significance given its extensive applications in various industrial fields. At present, methanol carbonylation is the main industrial production process of FA. However, this process uses two kinds of raw materials from fossil fuels and emits a large amount of CO2. Alternatively, converting CO2 into FA can not only achieve the production of value-added chemicals but also effectively address environmental issues caused by CO2 emission. To improve the low reactivity of CO2, homogeneous and heterogeneous catalytic systems have been widely evaluated, among which heterogeneous catalytic systems are attracting ever-increasing attention owing to their great industrialization prospects. However, some of these heterogeneous catalysts suffer from low catalytic performance. Herein, PdAu alloy nanoparticles anchored on amine-functionalized hierarchical porous carbon (PdAu/HPC-AP) were constructed to drive efficient converting of CO2 into FA. Characterization and testing results demonstrated that the introduced Au atoms caused lattice distortion and charge redistribution on the surface of the bimetallic catalyst, facilitating the adsorption and activation of reaction molecules. Furthermore, the modification of HPC with an appropriate amount of amine ligands was found important to the chemical adsorption of CO2 and the dispersion of PdAu NPs. The Pd60Au40/HPC-AP catalyst with the optimum synergy of alloy and ligand demonstrated excellent activity for the target reaction with a TOF value of 516 h–1 at 100 oC. Moreover, it can even catalyze the reaction at room temperature with a TOF value of 13 h–1. © 2024, The Authors. All rights reserved.

关键词： Formic acid

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Chemical characteristics and sources apportionment of volatile organic compounds in the primary urban area of Shijiazhuang,North China Plain

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Journal of Environmental Sciences 2025年第3期149卷 465-475页

作者： Xiao Zhang Junfeng Wang Jiangwei Zhao Junliang He Yali Lei Kai Meng RuiWei Xue Zhang Miaomiao Zhang Shuangying Ni Eleonora Aruffo College of geographical sciences and Environment Shijiazhuang UniversityShijiazhuang 050035China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Hebei Province Ecology Environmental Monitoring Center Shijiazhuang 050037China Key Lab of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Hebei Provincial Institute of Meteorological Sciences Shijiazhuang 050021China Key Laboratory of Meteorology and Ecological Environment of Hebei Province Shijiazhuang 050021China Hebei Provincial Academy of Ecological Environmental Science Shijiazhuang 050037China Department of Advanced Technologies in Medicine&Dentistry University“G.d’Annunzio”of Chieti-PescaraChieti 66100Italy Center for Advanced Studies and Technology-CAST Chieti 66100Italy

VOCs(Volatile organic compounds)exert a vital role in ozone and secondary organic aerosol production,necessitating investigations into their concentration,chemical characteristics,and source apportionment for the effective implementation of measures aimed at preventing and controlling atmospheric *** to October 2020,onlinemonitoringwas conducted in the main urban area of Shijiazhuang to collect data on VOCs and analyze their concentrations and ***,the PMF(positive matrix factorization)method was utilized to identify the VOCs *** indicated that the TVOCs(total VOCs)concentration was(96.7±63.4μg/m^3),with alkanes exhibiting the highest concentration of(36.1±26.4μg/m^3),followed by OVOCs(16.4±14.4μg/m^3).The key active components were alkenes and aromatics,among which xylene,propylene,toluene,propionaldehyde,acetaldehyde,ethylene,and styrene played crucial roles as reactive *** sources derived from PMF analysis encompassed vehicle emissions,solvent and coating sources,combustion sources,industrial emissions sources,as well as plant sources,the contribution of which were 37.80%,27.93%,16.57%,15.24%,and 2.46%,***,reducing vehicular exhaust emissions and encouraging neighboring industries to adopt low-volatile organic solvents and coatings should be prioritized to mitigate VOCs levels.

关键词： Volatile organic compounds Pollution characteristics Ozone formation potential OH radical loss rate Source apportionment

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