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Research on the improvement of the LaneGCN trajectory prediction algorithm

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Transportation Safety and Environment 2022年第4期4卷 121-129页

作者： Bing Zhou Junjun Zou Xiaojian Wu Tian Chai Renjie Zhou Qianxi Pan Ruixuan Zhou State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082HunanChina School of Mechatronics Engineering Nanchang Nanchang UniversityNanchang 330027JiangxiChina College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082HunanChina Internation Business School Hunan University of Technology and BusinessChangsha 410205HunanChina.

The LaneGCN proposed by Uber has achieved good performance in trajectory prediction, but it has shortcomings in capturing longrange information, expressing road information and modelling the strong and weak relationships of interaction between actors. Inthis paper, the LaneGCN is improved from three parts. Firstly, multi-scale long short-term memory is introduced to encode multiscaletrajectory information. Secondly, relative distance information is added to enhance the spatial expressive capacity of themodelin the process of road information encoding. Finally, we build a weighted interaction model based on Graph Attention Networksin the process of road information encoding. In order to verify the performance of the improved model, ablation and comparisonexperiments are designed in this paper. The results showed that all the evaluation metrics are lower than the LaneGCN and theoverall performance of the model is improved.

关键词： Autonomous driving trajectory prediction graph neural network

金属离子辅助转化法助力Ti_(3)C_(2)T_(x)前驱体衍生制备儿茶酚基MOF

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Science Bulletin 2023年第19期68卷 2180-2189,M0004页

作者：王维康白岩杨品袁帅李飞阳赵为为金贝贝张璇刘淑娟袁大强赵强 State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&TelecommunicationsNanjing 210023China College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts&TelecommunicationsNanjing 210023China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China

MXene具有丰富的高电负性末端原子、较大的比表面积和较小的原子厚度等优点,已被用作前驱体制备多种纳米材料.然而,目前已报道的用于衍生金属有机框架(MOF)的MXene仅限于V_(2)CT_(x).因此,通过增加MXene和有机配体的种类,合理设计和合... 详细信息

MXene具有丰富的高电负性末端原子、较大的比表面积和较小的原子厚度等优点,已被用作前驱体制备多种纳米材料.然而,目前已报道的用于衍生金属有机框架(MOF)的MXene仅限于V_(2)CT_(x).因此,通过增加MXene和有机配体的种类,合理设计和合成新型MOF,并进一步深入探索其合成机理仍是目前面临的重要挑战.本文采用金属离子辅助转化策略,以二维Ti_(3)C_(2)T_(x)为前驱体,合成了具有非互穿SrSi2(srs)框架的基于儿茶酚的三维(3D)TiCu-HHTP(HHTP=2,3,6,7,10,11-六羟基三苯)MOF.该策略表现出了良好的普适性,Ti3C2和辅助Cu^(2+)离子可以扩展到V2C MXene和其他辅助金属离子Mn^(+)(M=Ni^(2+)、Co^(2+),Mn^(2+)和Zn^(2+)).转化机制包括从Ti3C2纳米片到辅助金属离子的电荷转移、Ti-C键断裂促进释放Ti^(4+)离子以及Ti^(4+)/Mn^(+)与HHTP之间的强螯合配位协同促进TiCu-HHTP的形成.独特的3D导电网络和丰富的氧化还原位点赋予了TiCu-HHTP-7/PPy复合柔性透明电极快速的离子/电子传输和可逆的法拉第反应.在0.02 mA cm^(-2)电流密度下,TiCu-HHTP/PPy透明电极的面积比电容值达到3.63 mF cm^(-2),明显高于纯PPy电极的面积电容值(1.79 mF cm^(-2)).TiCu-HHTP/PPy透明电容器在0.75μW cm^(-2)的功率密度下,能量密度为0.042μWh cm^(-2).

关键词：金属有机框架儿茶酚离子辅助电荷转移有机配体电负性电子传输透明电极

An Improved Toughness Process for High-Temperature Hot-Rolled Hsla Steel Via Inclusion-Induced Acicular Ferrite Nucleation

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SSRN 2023年

作者： Wang, Xin Wu, Zihan Zhang, Nannan Wang, Chao Yuan, Guo School of Materials Science and Engineering Shenyang University of Technology 110870 China Provincial Key Laboratory of Advanced Welding Technology and Automation 110870 China State Key Laboratory of Rolling and Automation Northeastern University 110819 China Shenyang University of Technology China

A feasible method of enhancing the impact toughness (-20°C) of high-temperature hot-rolled HSLA steels was proposed. The results show that the toughness of the improved hot-rolled steel containing TiOx-CaO-ZrO2 oxide particles was significantly enhanced by ~132 J compared with conventional steel containing Al-Ca oxide particles. The fine (Ti, Ca, Zr) Ox particles with high-density of ~937 counts/mm2 significantly promotes anti-cracking acicular ferrite (AF) nucleation. Moreover, the fractional volume of AF increased from ~ 79% to ~ 85% when the rolling temperature was increased from ~ 1055°C to ~ 1085°C. © 2023, The Authors. All rights reserved.

关键词： Nucleation

Nanomultilayer Gradation Strategy to Improve Mechanical Properties of Tisin/Alcrn Hard Coatings

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SSRN 2024年

作者： Li, Qizhong Liu, Fazhen Yang, Mai Gao, Tenghua Ji, Baifeng Zhang, Song Tu, Rong Zhang, Lianmeng Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Xiangxing Road 6 Guangdong Zhongshan528400 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology 122 Luoshi Road Wuhan430070 China School of Civil Engineering and Architecture Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

The structures design and optimization of multilayer coatings, which are utilized to surmount the trade-off between hardness and toughness, has been a current hot topic in the field of hard ceramic coatings. Herein, multi-layered TiSiN/AlCrN coatings with a constant and gradient sublayer thickness (Λ, modulation periods) ranging from 20 to 3.8 nm were prepared by the Cathodic Arc Ion plating. The microstructure, mechanical properties, residual stress and fracture toughness of four gradient structures were investigated systematically. All coatings exhibit a typical FCC crystal structure. In the coating with a monotonous decrease of modulation period (G2 gradient structure), the interface between the TiSiN layer and the AlCrN layer transformed from a partially semi-coherent interface at the bottom layers of Λ = 20 nm, to a fully coherent interface at the top layers of Λ = 3.8 nm, showing the higher mechanical properties than those of G2 (reverse structure of G1). The coating with dual-gradient V2 structure (G1+G2) demonstrated the highest hardness (37.6 ± 1.0 GPa), H/E and H3/E2 ratios (0.095 and 0.34 GPa), and bonding strength (75.3 N), as well as lowest friction coefficient (0.34) and wear rate (6.7×10-6 mm3/Nm). The remarkable resistance to damage and toughness displayed by the V2 structure could be ascribed to its intrinsic capacity for effectively alleviating stress concentration and accommodating incompatibilities during the plastic deformation process. This work offers insights into employing gradient architecture design to enhance the strength and toughness of coatings. © 2024, The Authors. All rights reserved.

关键词： Silicon compounds

Grain Orientation and Prediction of Thermal Shock Fatigue of Sn-3Ag-0.5Cu Solder Joints for Fan-Out Wafer Level Packaging

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Grain Orientation and Prediction of Thermal Shock Fatigue of...

Electronic Components and technology Conference (ECTC)

作者： Shuye Zhang Xinyi Jing Peng He Kyung-Wook Paik State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin China Department of Materials Science and Engineering KAIST Daejeon South Korea

In this study, the grain orientation, microstructure evolution and fatigue life prediction of Sn-3Ag-0.5Cu (SAC305) solder joints in fan-out wafer level packaging are studied in terms of thermal shock tests. The heterogenous evolution of microstructures in SAC305 solder joints was investigated using thermal shock and electron backscattered diffraction (EBSD) analysis. When the number of thermal shocks reached 600, the local deformation caused by the thermal expansion mismatch caused the heterolattices in the joint to rotate toward the corners. During deformation, the formation of sub-grains is accompanied by increasing misorientation, accumulation of plastic slip in the strained local area, and activation of the slip system. After that, the stress-strain distribution of SAC305 solder joints during thermal shock was studied using the multi-physics coupling model, and the Coffin-Manson life model was used to simulate the number of failure cycles of solder joints after thermal shock. It is found that for a single solder joint, the number of failure cycles of the solder joints with the upper and lower parts in contact with other materials is basically 600–700 times. The work in this paper provides new insights into the further study of the early stages of grain orientation, microstructural deformation and the accumulation of stored energy associated with these deformations, providing support for a more in-depth study of recrystallization and crack propagation phenomena during thermal shock.

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Transition-Free Indirect Bonding Towards 3d Multi-Layer Glass Stacking

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SSRN 2023年

作者： Qi, Xiaoyun Li, Ge Yan, Han Tong, Junhe Ma, Guanying Zhao, Na Wang, Chenxi State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Beijing Institute of Control Engineering Beijing100194 China

Optical and photonic devices comprised of fused-silica glass portfolios play an important role in astronomical detections, which requires the bonding interfaces to own robust mechanical properties and less optical loss. Indirect bonding lowers the difficulty of the bonding process than direct bonding by introducing the intermediate or transition layers introduced but will inversely diminish the optical properties. In this study, a transition-free indirect bonding (TFB) strategy was developed to realize glass bonding without interfacial transition boundary. In the process, the oxygen plasma activation was applied to reconstruct the glass surface. Owing to the produced chemical sites with the plasma surface activation, multiple paths could be provided for surface and interface reactions than conventional indirect bonding method hydroxide-catalyzed bonding (HCB). These adequate reactions constructed a whole and uniform Si-O network crossing the bonding interfaces, which was transition-free between the interface and bulk substrates. The uniform and non-transition interface performed higher bonding strength and excellent optical transmittance with less loss than HCB. Based on the TFB strategy, multilayer chips were combined together enabling a 3D multi-layer chip stacking with low transmittance loss and stable mechanical structure for state-of-the-art optical applications in astronomical detection, laser instruments, and optical sensors. © 2023, The Authors. All rights reserved.

关键词： Glass

First-Principles Study of Discharge Products and Their Stability of Lithium-Nitrogen Batteries

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SSRN 2023年

作者： Qu, Guo-Xiong Zhao, Xu-Dong Wei, Cheng-Dong Zhang, Hong-Yi Yang, Yu-Tong Xue, Hong-Tao Tang, Fu-Ling State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

In this paper we adopted the first-principles approach to simulate and analyze the possible material changes in the discharge process of Li-N2 battery. The discharge process is simulated on a 4N-graphene anode substrate model, by analyzing its molecular configuration, electrostatic potential, density of states, HOMO, and LUMO. Experimental results confirmed that Li3N is the final stabilization product of Li-N2 battery. Furthermore, we found that the adsorption energy is proportional to the amount of charge transferred. The battery voltage-capacity is computed based on the change of Gibbs free energy curve. The electrical properties of the adsorption system indicate that the adsorption of Li-N2 transforms graphene from a semiconducting material to a metallic one. In addition, the differential charge also indicates that the Li-N substance has a strong adsorption interaction with the substrate, which can play the dual roles of electricity storage and nitrogen fixation. © 2023, The Authors. All rights reserved.

关键词： Electronic properties

A Precise Shape Sensing Method Considering Sectional Deformation for Slender Structures with Large Deformation

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SSRN 2024年

作者： Wu, Maoqi Tan, Shujun State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment Dalian University of Technology Dalian116024 China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of Technology Dalian116024 China School of Mechanics and Aerospace Engineering Dalian University of Technology Dalian University of Technology Dalian116024 China

Fiber-optic shape sensing is regarded as a promising solution for shape and structural health monitoring by researchers from different engineering fields due to its advantages in compactness and large-scale measurement. In this study, a shape sensing method considering warping for slender structures undergoing large deformation is proposed. Higher-order Absolute Nodal Coordinate Formulation beam elements with higher-order transverse interpolation function are used to capture sectional deformation. The inverse higher-order elements introduce non-contributing deformation modes that are similar to the hourglass mode, and a corresponding control method is proposed to solve this problem. Due to the requirement for computational efficiency, a mixed kinematic description incorporating Saint Venant's warping functions and slope vectors is introduced to significantly reduce the nodal degrees of freedom required to capture cross-sectional warping. The biharmonic spline function is used to obtain an approximate warping function. The results of the numerical cases show that the proposed method can not only accurately reconstruct the shape of slender structures with different sections, but also effectively reconstruct their mechanical states. © 2024, The Authors. All rights reserved.

关键词： Inverse kinematics

Effect of organic carbon sources on the anodic corrosion of magnesium AZ31B by sulfate-reducing prokaryote

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Journal of Central South University 2024年第10期31卷 3369-3381页

作者： LI Jin-rong ZHANG Jie KRISHNAMURTHY Mathivanan ZHU Qing-jun XING Shao-hua ZHANG Rui-yong SAND Wolfgang DUAN Ji-zhou HOU Bao-rong Key Laboratory of Advanced Marine Materials Key Laboratory of Marine Environmental Corrosion and Bio-foulingInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Institute of Marine Corrosion Protection Guangxi Academy of SciencesNanning 530007China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China Institute of Biosciences University of Mining and Technology09599 FreibergGermany Aquatic Biotechnology Faculty for ChemistryUniversity of Duisburg-Essen45141 EssenGermany

Corrosion caused by sulfate-reducing prokaryotes(SRP)is an important cause of magnesium alloy anode failure in oil *** this study,the effects of Desulfovibrio ***3 on the corrosion behavior of AZ31B magnesium alloy anode in organic carbon sources with different contents in simulated tidal flat environment were analyzed using weight loss test,surface analysis and electrochemical analysis *** results showed that the weight loss rate of coupons in low carbon sources contents(0%,1%,10%)was higher than that in 100%carbon *** analyses showed that the corrosion current density(J_(corr))under low carbon sources contents was larger,while the charge transfer resistance(R_(ct))was lower,leading to a higher corrosion rate compared to those under 100%carbon sources *** from scanning electron microscopy(SEM)and confocal laser scanning microscopy(CLSM)revealed more severe pitting corrosion on the alloy surface in the absence of carbon *** addition,a large number of nanowires were observed between bacteria on the alloy surface using *** with thermodynamic calculations,it was demonstrated that the corrosion of coupons by Desulfovibrio ***3 in the absence of carbon sources was achieved through extracellular electron transfer.

关键词： AZ31B magnesium anode organic carbon source microbiologically influenced corrosion(MIC) sulfatereducing prokaryotes