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Effect of void size and Mg contents on plastic deformation behaviors of Al-Mg alloy with pre-existing void:Molecular dynamics study

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Chinese Physics B 2022年第6期31卷 580-588页

作者： Ning Wei Ai-Qiang Shi Zhi-Hui Li Bing-Xian Ou Si-Han Zhao Jun-Hua Zhao Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan UniversityWuxi 214122China China Aerodynamics Research and Development Center Mianyang 621000China National Laboratory for Computational Fluid Dynamics Beijing 100191China National Graphene Products Quality Supervision and Inspection Center Special Equipment Safety Supervision Inspection Institute of Jiangsu ProvinceWuxi 214174China

The plastic deformation properties of cylindrical pre-void aluminum-magnesium(Al-Mg)alloy under uniaxial tension are explored using molecular dynamics simulations with embedded atom method(EAM)*** factors of Mg content,void size,and temperature are *** results show that the void fraction decreases with increasing Mg in the plastic deformation,and it is almost independent of Mg content when Mg is beyond 5%.Both Mg contents and stacking faults around the void affect the void *** phenomena are explained by the dislocation density of the sample and stacking faults distribution around the *** variation trends of yield stress caused by void size are in good agreement with the Lubarda ***,temperature effects are explored,the yield stress and Young’s modulus obviously decrease with *** results may enrich and facilitate the understanding of the plastic mechanism of Al-Mg with defects or other alloys.

关键词： Al-Mg alloys molecular dynamics nanovoid plastic deformation

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A Compliant Traction Method of Manipulator Based on Online Calibration of Force Sensor Zero-Point 6

A Compliant Traction Method of Manipulator Based on Online C...

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6th International Conference on Automation, Control and Robots, ICACR 2022

作者： Xu, Zhilu Wang, Weijun Feng, Wei Chinese Academy of Sciences Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Shenzhen China Shenzhen Institute of Advanced Technology Cas Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen China

ISBN: (数字)9781665498739

ISBN: (纸本)9781665498739

With the increasing number of cooperative robots, it is becoming increasingly important to improve the safety and operability of human-robot interaction. Installing a six-dimensional force sensor at the end of the manipulator can realize the drag of the manipulator in Cartesian space. A compliant traction method of manipulator based on online calibration of force sensor zero-point is proposed in this paper. Aiming at the problem of "zero drift"of force sensor, after calculating the gravity of the end tool, the zero-point of the force sensor is calibrated online by means of mean processing, so as to obtain more accurate external force. Then, the relationship between the end position of the manipulator and the external force, the end moving speed of the manipulator and the external force is established, and the change of the position and speed of the manipulator is controlled by the external force at the same time. Finally, experiments show the effectiveness of this method and ensure the safety and reliability in the traction process. © 2022 IEEE.

关键词： Manipulators

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Recent advances in the application of MXenes for neural tissue engineering and regeneration

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Neural Regeneration Research 2024年第2期19卷 258-263页

作者： Menghui Liao Qingyue Cui Yangnan Hu Jiayue Xing Danqi Wu Shasha Zheng Yu Zhao Yafeng Yu Jingwu Sun Renjie Chai State Key Laboratory of Digital Medical Engineering Department of Otolaryngology Head and Neck SurgeryZhongda HospitalSchool of Life Sciences and TechnologyAdvanced Institute for Life and HealthJiangsu Province High-Tech Key Laboratory for Bio-Medical ResearchSoutheast UniversityNanjingJiangsu ProvinceChina Co-Innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Oto-Rhino-Laryngology West China HospitalSichuan UniversityChengduSichuan ProvinceChina First Affiliated Hospital of Soochow University SuzhouJiangsu ProvinceChina Department of Otolaryngology-Head and Neck Surgery The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina Department of Otolaryngology Head and Neck Surgery Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijingChina Beijing Key Laboratory of Neural Regeneration and Repair Capital Medical UniversityBeijingChina

Transition metal carbides and nitrides(MXenes)are crystal nanomaterials with a number of surface functional groups such as fluorine,hydroxyl,and oxygen,which can be used as carriers for proteins and *** have excellent biocompatibility,electrical conductivity,surface hydrophilicity,mechanical properties and easy surface ***,at present,the stability of most MXenes needs to be improved,and more synthesis methods need to be *** are good substrates for nerve cell regeneration and nerve reconstruction,which have broad application prospects in the repair of nervous system *** the application of MXenes in neuroscience,mainly at the cellular level,the long-term in vivo biosafety and effects also need to be further *** review focuses on the progress of using MXenes in nerve regeneration over the last few years;discussing preparation of MXenes and their biocompatibility with different cells as well as the regulation by MXenes of nerve cell regeneration in two-dimensional and three-dimensional environments in *** have great potential in regulating the proliferation,differentiation,and maturation of nerve cells and in promoting regeneration and recovery after nerve *** addition,this review also presents the main challenges during optimization processes,such as the preparation of stable MXenes and long-term in vivo biosafety,and further discusses future directions in neural tissue engineering.

关键词： hydrogels MXenes nerve regeneration neural cells neural stem cells organoids spiral ganglion neurons

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Hierarchical porous yolk-shell Co-N-C nanocatalysts encaged in graphene nanopockets for high-performance Zn-air battery

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Nano Research 2023年第7期16卷 8893-8901页

作者： Yisi Liu Zongxu Li Shizhu Wang Jinnan Xuan Dongbin Xiong Lina Zhou Jianqing Zhou Jun Wang Yahui Yang Yue Du Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China Jiangsu Key Laboratory of Materials and Technology for Energy Conversion College of Material Science and EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China National&Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China

The rational design and preparation of promising cathode electrocatalysts with excellent activity and strong stability for metal-air batteries is a huge *** this work,we innovate an approach of combining solvothermal with high-temperature pyrolysis utilizing zeolitic imidazolate framework(ZIF)-8 and ZIF-67 as the template to synthesize a novel hybrid material of hierarchical porous yolk-shell Co-N-C polyhedron nanocatalysts engaged in graphene nanopocket(yolk-shell Co-N-C@GNP).The obtained catalyst exhibits prominent bifunctional electrocatalytic performance for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)in the alkaline condition,in which the half-wave potential is 0.86 V for ORR,and the over-potential for OER is 0.42 V at 10 mA·cm^(-2).The rechargeable aqueous Zn-air battery fabricated with yolk-shell Co-N-C@GNP cathode deliveries an open circuit voltage(OCV)of 1.60 V,a peak power density of 236.2 mW·cm^(-2),and excellent cycling stability over 94 h at 5 mA·cm^(-2).The quasi-solid-state Zn-air battery(ZAB)using yolk-shell Co-N-C@GNP displays a high OCV of 1.40 V and a small voltage gap of 0.88 V in continuous cycling tests at 2 mA·cm^(-2).This work provides a valuable thought to focus attention on the design of high-efficient bifunctional catalysts with hierarchical porous yolk-shell framework and high-density metal active sites for metal-air battery technologies.

关键词： zeolitic imidazolate framework(ZIF)-67@ZIF-8 yolk-shell graphene nanopocket Bi-functional catalysts Zn-air battery

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Step-edge controlled fast growth of wafer-scale MoSe_(2)films by MOCVD

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Nano Research 2023年第7期16卷 9577-9583页

作者： Rui Ji Jing Liao Lintao Li Rongji Wen Mengjie Liu Yifeng Ren Jianghua Wu Yunrui Song Minru Qi Zhixing Qiao Liwei Liu Chengbing Qin Yu Deng Yongtao Tian Suotang Jia Yufeng Hao Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Medical Imaging Shanxi Medical UniversityTaiyuan 030001China MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Integrated Circuits and ElectronicsBeijing Institute of TechnologyBeijing 100081China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs),due to their unique physical properties,have a wide range of applications in the next generation of electronics,optoelectronics,and ***-scale preparation of high-quality TMDCs films is critical to realize these potential *** we report a study on metal-organic chemical vapor deposition(MOCVD)growth of wafer-scale MoSe_(2)films guided by the crystalline step edges of miscut sapphire *** established that the nucleation density and growth rate of MoSe_(2)films were positively correlated with the step-edge density and negatively with the growth *** a certain temperature,the MoSe_(2)domains on the substrate with high step-edge density grow faster than that with low *** a result,wafer-scale and continuous MoSe_(2)films can be formed in a short duration(30 min).The MoSe_(2)films are of high crystalline quality,as confirmed by systematic Raman and photoluminescence(PL)*** results provide an important methodology for the rapid growth of wafer-scale TMDCs,which may promote the application of 2D semiconductors.

关键词： MoSe_(2) nucleation density transition metal dichalcogenides metal-organic chemical vapor deposition(MOCVD) waferscale two-dimensional(2D)semiconductor

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Chiral carbon dots from glucose by room temperature alkaliassisted synthesis for electrocatalytic oxidation of tryptophan enantiomers

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Nano Research 2023年第7期16卷 8929-8936页

作者： Mengling Zhang Xing Fan Xin Du Yurong Ma Xiting Wang Hui Huang Yang Liu Youyong Li Zhenhui Kang Macao Institute of Materials Science and Engineering(MIMSE) MUST-SUDA Joint Research Center for Advanced Functional MaterialsMacao University of Science and TechnologyTaipaMacao 999078China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Research Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China

Chiral catalysis is one of the most direct and effective approach to obtain pure optical *** carbon dots(CDs)as carbon-based chiral catalysts show great potential in chiral ***,we report a facile one step base-catalyzed aldol condensation to fabricate the chiral CDs from glucose at ambient temperature and *** formation of chiral CDs involves the processes of isomerization and aldol *** chiral CDs have been demonstrated that they have selective capacity for electrocatalytic oxidization of tryptophan enantiomers.L type of CDs(LCDs)is more likely to catalyze L-tryptophan(Trp)than D-Trp with the selective factor(I_(L)/I_(D))of 1.60,whereas the D type of CDs(DCDs)tends to catalyze D-Trp(I_(L)/I_(D):0.63).Theoretical calculations combined with various contrast experiments(temperature and pH)demonstrate that the selectively electrocatalytic capacity of chiral CDs toward Trp isomers is due to the different hydrogen-bond interactions between chiral CDs and Trp.

关键词： chiral carbon dots synthesis mechanism electrocatalysis chiral catalysis

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Stable α-CsPbI3 with extremely red emission for expanding the color gamut

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Science China(Information Sciences) 2024年第5期67卷 311-317页

作者： Yong ZHANG Xin WEI Lei GAO Weijie ZHAO Changjiu SUN Junli WEI Mingjian YUAN Zhenhua NI Junpeng LU Hongwei LIU School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Jiangsu Key Lab on Opto-Electronic Technology School of Physics and TechnologyNanjing Normal University

The wider color gamut represents the better reproducibility of the real natural colors. Perovskite materials exhibit promising potential in full-color wide-gamut displays because of the wide tunability and high saturability of their photon emission. However, the full-color wide gamut(>100% Rec.2020) has not been constructed due to the lack of the extreme red primary color(～700 nm). Herein, the widest color gamut is realized, whereinα-CsPbI3 is used to generate the extreme red primary color. An in-situ encapsulation approach is advised to stabilizeα-CsPbI3 at room temperature by means of polyvinylpyrrolidone(PVP).Theα-CsPbI3 encapsulated by PVP(denoted as P-CPI) shows highly saturated(FWHM(full width at half maximum) ～28 nm) and extremely(～697 nm) red emission. The green emission is provided by P-CPBr(CsPbBr3 with PVP) which is also synthesized using the universal in-situ encapsulation approach. With the assistance of a commercial Ga N chip, the RGB gamut is extended to the widest(151% NTSC, 113%Rec.2020).

关键词： all-inorganic perovskite wide color gamut LED display carrier recombination

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Lignin‐derived carbon with pyridine N‐B doping and a nanosandwich structure for high and stable lithium storage

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Carbon Energy 2024年第8期6卷 232-247页

作者： Dichao Wu Jiayuan Li Yuying Zhao Ao Wang Gaoyue Zhang Jianchun Jiang Mengmeng Fan Kang Sun Key Lab of Biomass Energy and Material Jiangsu ProvinceNational Engineering Lab for Biomass Chemical UtilizationKey and Open Lab on Forest Chemical EngineeringSFAInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjingChina Jiangsu Co‐Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjingChina School of Energy and Environment Southeast UniversityNanjingChina Department of Chemistry Tsinghua UniversityBeijingChina Fujian Provincial Key Laboratory of Biomass Low‐Carbon Conversion Academy of Advanced Carbon Conversion TechnologyHuaqiao UniversityXiamenChina Chinese Academy of Sciences Xinjiang Lihua Institute of Technology UrumqiChina

Biomass‐derived carbon is a promising electrode material in energy storage ***,how to improve its low capacity and stability,and slow diffusion kinetics during lithium storage remains a *** this research,we propose a“self‐assembly‐template”method to prepare B,N codoped porous carbon(BN‐C)with a nanosandwich structure and abundant pyridinic N‐B *** nanosandwich structure can increase powder density and cycle stability by constructing a stable solid electrolyte interphase film,shortening the Li^(+) diffusion pathway,and accommodating volume expansion during repeated charging/*** abundant pyridinic N‐B species can simultaneously promote the adsorption/desorption of Li^(+)/PF_(6)^(−) and reduce the diffusion *** BN‐C electrode showed a high lithium‐ion storage capacity of above 1140 mAh g^(−1) at 0.05 A g^(−1) and superior stability(96.5% retained after 2000 cycles).Moreover,owing to the synergistic effect of the nanosandwich structure and pyridinic N‐B species,the assembled symmetrical BN‐C//BN‐C full cell shows a high energy density of 234.7Wh kg^(−1),high power density of 39.38 kW kg−1,and excellent cycling stability,superior to most of the other cells reported in the *** the density functional theory simulation demonstrated,pyridinic N‐B shows enhanced adsorption activity for Li^(+) and PF_(6)^(−),which promotes an increase in the capacity of the anode and cathode,***,the relatively lower diffusion barrier of pyridinic N‐B promotes Li^(+) migration,resulting in good rate ***,this study provides a new approach for the synergistic modulation of a nanostructure and an active site simultaneously to fabricate the carbon electrode material in energy storage devices.

关键词： high cycling stability high energy density lithium‐ion batteries pyridinic N‐B species sandwich structure carbon nanosheet

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Accurate Prediction of Knee Joint Angles Using a Hybrid CNN-LSTM-Attention Network from Surface Electromyography

Accurate Prediction of Knee Joint Angles Using a Hybrid CNN-...

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2024 IEEE International Conference on robotics and Biomimetics, ROBIO 2024

作者： Wang, Zhuo Chen, Hui Yang, Fangliang Wang, Xiangyang Wu, Xinyu Chen, Chunjie Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen518055 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781665481090

In various fields such as robotics, rehabilitation, biomechanics, human-machine interfaces, and clinical research, human motion prediction has extensive applications. A hybrid networks model based on Convolutional Neural Network-Long Short-Term Memory-Attention (CNN-LSTM-Attention) was employed in this paper to extract features from the high-dimensional space and time series of surface electromyography (sEMG) data for continuous prediction of knee angles. Five able-bodied subjects participated in the study, walking at a self-selected pace while six surface electromyography (sEMG) signals from muscles involved in knee flexion and extension, along with knee angles, were synchronously recorded. The performance was assessed using the root mean square error (RMSE), Pearson Correlation Coefficient (r), and coefficient of determination (R2) between estimated and measured knee joint angles. Compared to the CNN, LSTM, and CNN-LSTM algorithms, the adopted method estimated knee angles more accurately, achieving an average RMSE, ρ, and R2 of 3.09± 0.90,\ 0.9911 ± 0.0052, and 0.9817± 0.0108, respectively. As the advance time increased, the accuracy of knee joint angle estimation decreased, particularly when the advance time reached 100 ms, at which point the RMSE is 4.83 degress. In addition, the computing time of the prediction model was less than 1 ms, which was shorter than the advance time 100 ms it could predict, thereby facilitating real-time computation in practical environments. Compared to previous studies, the proposed method excelled at extracting features directly from raw signals, avoiding the need for handcrafted feature extraction. Consequently, the model effectively achieved continuous and accurate predictions of joint motion angles and demonstrated potential to reduce latency in the human-machine interface. © 2024 IEEE.

关键词： Clinical research

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Resin transfer molding process and performance of paraffin based energy storage composites framed on polyurethane foam

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Materials Science for Energy Technologies 2022年 5卷 252-261页

作者： Zusheng, Hang Zichun, Lv Yongsheng, Zhang Qing, Zhang Xu, Wang Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167 China School of Materials Science and Engineering Nanjing Institute of Technology Nanjing211167 China School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China

With the continuous exploration and development in the field of energy storage, phase Change Material (PCM) are good energy storage materials. Paraffin wax is a good low-temperature phase change material because of its high enthalpy of phase change, stable chemical properties, no subcooling and low cost. However, it has disadvantages such as easy leakage of phase change and low thermal conductivity in practical applications. In this paper, octadecane with a melting point of 22 °C and 52# paraffin wax with a melting point of 54 °C were used as raw materials, and paraffin wax with a melting point of 35 °C was prepared by blending with a mass ratio of 1: 1.5 (52# paraffin wax: octadecane), and then the blended paraffin wax was compounded with polyurethane frame structure by resin transfer molding (RTM) method, and finally aluminum foil was used to encapsulate the composite phase change material and enhance its thermal conductivity. The properties of the composite phase change material were investigated by DSC (Differential Scanning Calorimeter), FTIR (Fourier Transform infrared spectroscopy), TG (glass transition temperature), and tensile tests. The results show that the tensile strength decreases with the increase of RTM infusion pressure, and the minimum is 6.5 kPa, at which time the elongation at break is 55.2%, and the thermal conductivity of the composite material after aluminum foil encapsulation is 1.83 W/(m·K), and the thermal conductivity is found to be stable after residual analysis. This paper provides a technical reference for the rapid batch preparation of PCM composite system by RTM molding method with polymer material as the frame structure. © 2022

关键词： Phase change materials

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