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Effect of ECAP process on liquid distribution of AZ80M alloy during semi-solid isothermal heat treatment

Transactions of Nonferrous Metals Society of China 2021年第6期31卷 1599-1611页

作者： Ling-ling FAN Ming-yang ZHOU Yang-yang GUO Yu-wen-xi ZHANG Gao-feng QUAN Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China

Two kinds of semi-solid samples of AZ80−0.2Y−0.15Ca(wt.%)(AZ80M)magnesium alloy were prepared by semi-solid isothermal heat treatment of materials with and without equal channel angular pressing(ECAP)*** microstructures of initial and semi-solid treated samples were compared and *** results showed a significant difference in the liquid phase distribution between three-pass ECAP processed(3P)and as-received samples during the isothermal heating *** semi-solid 3P sample showed a more uniform liquid distribution due to its smaller dihedral ***,the coarsening processes of solid grains of as-received and 3P samples were dominated by the coalescence and Ostwald ripening mechanism,*** difference of coarsening processes was mainly related to the proportion of the high-angle grain boundaries in materials,which further affected the evolution behavior of the liquid pools.

关键词： AZ80M equal channel angular pressing semi-solid microstructure liquid phase distribution coarsening mechanism

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Nondestructive Detection of Low Concentrations Glucose via Broadband Background-Free Mid-Infrared Absorption Spectroscopy

Nondestructive Detection of Low Concentrations Glucose via B...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Shinta Ozawa Neil Irvin Cabello Yue Zhao Takao Fuji Laser Science Laboratory Toyota Technological Institute Nagoya Japan Graduate School of Engineering College of Design and Manufacturing Technology Muroran Institute of Technology Hokkaido Japan

We have developed a background-free infrared absorption spectroscopy using sub-cycle pulses. This system has a broad detection bandwidth that covers the entire mid-infrared region and high sensitivity to detect ~50 mM... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Spectroscopy Sensitivity Absorption Bandwidth Lasers and electrooptics Glucose Broadband communication

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Optimal Minimum Energy Path Planning of Mobile Robot Based on Improved WOA-GA with Hybrid Strategy for Community-Centric Application

Optimal Minimum Energy Path Planning of Mobile Robot Based o...

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2023 International Conference on Machine Learning and Cybernetics, ICMLC 2023

作者： Du, Jiang Da-Lin, Zhou Gong-Fa, Li Bao-Li, Lu Jun-Tong, Yun Ying, Liu Wuhan University of Science and Technology Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan430081 China School of Computing University of Portsmouth PortsmouthPO1 3HE United Kingdom China Three Gorges University Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance Yichang443002 China Wuhan University of Science and Technology Key Laboratory of Mechanical Transmission and Manufacturing Engineering of Hubei Province Wuhan430081 China Precision Manufacturing Research Institute Wuhan University of Science and Technology Wuhan430081 China Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Research Center for Biomimetic Robot and Intelligent Measurement and Control Wuhan University of Science and Technology Wuhan430081 China

ISBN: (纸本)9798350303780

The path planning of mobile robots is investigated to minimize energy loss in intelligent manufacturing. To achieve optimal energy consumption planning, this paper proposes a hybrid strategy that enhances the whale optimization algorithm (WOA) and the genetic algorithm (GA). The WOA-GA algorithm combines their respective advantages and effectively mitigates premature convergence exhibited by the standard traditional algorithm. To enhance the global and local search capabilities of the standard WOA, we employ adaptive weighting and a Cauchy mutation strategy. Additionally, we introduce an adaptive crossover mutation probability and an elite strategy to mitigate the detrimental effects of the genetic algorithm's evolutionary operation in the late iterations, thereby improving its performance. This paper compares the performance of the standard GA, the standard WOA-GA algorithm, and the enhanced WOA-GA algorithm. The experimental results demonstrate that the enhanced WOA-GA algorithm can achieve optimal energy-efficient path planning using the hybrid strategy. The average energy consumption of the enhanced WOA-GA algorithm can be reduced by 30%, while the maximum energy consumption can be reduced by 47%. The results confirm the effectiveness and feasibility of the proposed method in enhancing the level of green manufacturing. © 2023 IEEE.

关键词： Genetic algorithms

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Boosting the intrinsic anomalous Hall effect through a topological phase transition in the magnetic Weyl semimetal Co3Sn2S2

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Physical Review B 2023年第20期107卷 205138-205138页

作者： Hongyi Sun Qihang Liu Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China International Quantum Academy Shenzhen 518048 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen 518055 China

The anomalous Hall Effect (AHE) is one of the most fundamental phenomena related to band topology and holds great potential for technological applications. A promising approach to search for large AHE is to begin with a magnetic Weyl semimetal (WSM) and manipulate the Weyl nodes in the momentum-energy (k−E) space. However, controlling the Weyl points is generally difficult because Weyl nodes can robustly exist at a generic momentum. Here we realize this approach in an experimentally confirmed ferromagnetic WSM Co3Sn2S2 via tension. Our calculations systematically demonstrate that the tension applied to Co3Sn2S2 can drive the movement and annihilation of Weyl nodes in the k−E space, triggering a high-Chern-number three-dimensional quantum AHE topological phase transition and thus greatly boosting the AHE. We also found a rare way of annihilation of Weyl nodes occurring near the Brillouin zone boundary. Our work offers a promising way to boost the AHE and sheds light on the search for three-dimensional quantum anomalous Hall insulators.

关键词： Anomalous Hall effect First-principles calculations Quantum anomalous Hall effect Topological materials Topological phase transition

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一种具有分形结构的弹黏塑性材料建模及其求解方法

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Acta Mechanica Sinica 2024年第3期40卷 176-190页

作者：李德建祁浩张鸣原霍君豪刘江硕饶远昊 State Key Laboratory for GeoMechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China Institute for Deep Underground Science and Engineering Beijing100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China China Academy of Urban Planning and Design Beijing100044China

本文建立了一种具有分形结构的元件模型,用于描述材料弹粘塑性特性,并可以在无需求解相应的无限阶微分方程的情况下获得各载荷作用下模型的力学反应.首先,基于这种建模方法,建立了表征具有复杂无限阶分形结构材料弹黏塑性特性的混联元... 详细信息

本文建立了一种具有分形结构的元件模型,用于描述材料弹粘塑性特性,并可以在无需求解相应的无限阶微分方程的情况下获得各载荷作用下模型的力学反应.首先,基于这种建模方法,建立了表征具有复杂无限阶分形结构材料弹黏塑性特性的混联元件模型(L-R模型).然后,利用MATLAB/Simulink,借助弹簧(弹性)、黏壶(黏性)和塑性体(塑性)单元的本构关系来描述材料的基本力学性能.之后,将宾厄姆模型作为基本模型按照分形理论进行迭代,通过求解得到描述材料在各种载荷作用下的力学(弹黏塑性)反应.最后,为了验证该建模方法及其求解结果的可靠性,在钢、板岩、煤、红砂岩和盐岩五种不同分形结构的材料上进行了循环载荷实验.将实验结果与求解结果进行比较,表明所建立的模型能够有效地描述材料的弹黏塑性性能.

关键词： Infinite order fractal structure Elastic-viscous-plastic properties Element model Experimental simulation

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Epigenetics in the modern era of crop improvements

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science China Life sciences 2025年第6期68卷 1570-1609页

作者： Yan Xue Xiaofeng Cao Xiangsong Chen Xian Deng Xing Wang Deng Yong Ding Aiwu Dong Cheng-Guo Duan Xiaofeng Fang Lei Gong Zhizhong Gong Xiaofeng Gu Chongsheng He Hang He Shengbo He Xin-Jian He Yan He Yuehui He Guifang Jia Danhua Jiang Jianjun Jiang Jinsheng Lai Zhaobo Lang Chenlong Li Qing Li Xingwang Li Bao Liu Bing Liu Xiao Luo Yijun Qi Weiqiang Qian Guodong Ren Qingxin Song Xianwei Song Zhixi Tian Jia-Wei Wang Yuan Wang Liang Wu Zhe Wu Rui Xia Jun Xiao Lin Xu Zheng-Yi Xu Wenhao Yan Hongchun Yang Jixian Zhai Yijing Zhang Yusheng Zhao Xuehua Zhong Dao-Xiu Zhou Ming Zhou Yue Zhou Bo Zhu Jian-Kang Zhu Qikun Liu State Key Laboratory of Wheat Improvement Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences in Weifang State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences State Key Laboratory of Hybrid Rice College of Life Sciences Wuhan University School of Life Sciences Division of Life Sciences and Medicine University of Science and Technology of China State Key Laboratory of Genetic Engineering Collaborative Innovation Center of Genetics and Development Department of Biochemistry and Biophysics Institute of Plant Biology School of Life Sciences Fudan University Key Laboratory of Plant Design National Key Laboratory of Plant Molecular Genetics Shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant Sciences Chinese Academy of Sciences Center for Plant Biology School of Life Sciences Tsinghua University Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE) Northeast Normal University State Key Laboratory of Plant Environmental Resilience Frontiers Science Center for Molecular Design Breeding College of Biological Sciences China Agricultural University College of Life Sciences Institute of Life Science and Green Development Hebei University Biotechnology Research Institute Chinese Academy of Agricultural Sciences College of Biology Hunan Key Laboratory of Plant Functional Genomics and Developmental Regulation Hunan Engineering and Technology Research Center of Hybrid Rapeseed Hunan University Institute of Advanced Agricultural Sciences School of Advanced Agricultural Sciences Peking University State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural University National Institute of Biological Sciences Key Laboratory of Seed Innovation Institute of Genetics and Developme

Epigenetic mechanisms are integral to plant growth, development, and adaptation to environmental stimuli. Over the past two decades, our comprehension of these complex regulatory processes has expanded remarkably, producing a substantial body of knowledge on both locus-specific mechanisms and genome-wide regulatory patterns. Studies initially grounded in the model plant Arabidopsis have been broadened to encompass a diverse array of crop species, revealing the multifaceted roles of epigenetics in physiological and agronomic traits. With recent technological advancements, epigenetic regulations at the single-cell level and at the large-scale population level are emerging as new focuses. This review offers an in-depth synthesis of the diverse epigenetic regulations, detailing the catalytic machinery and regulatory functions. It delves into the intricate interplay among various epigenetic elements and their collective influence on the modulation of crop traits. Furthermore, it examines recent breakthroughs in technologies for epigenetic modifications and their integration into strategies for crop improvement. The review underscores the transformative potential of epigenetic strategies in bolstering crop performance, advocating for the development of efficient tools to fully exploit the agricultural benefits of epigenetic insights.

关键词： epigenetics plant development plant immunity crop improvement stress responses

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A machine learning-based calibration method for strength simulation of self-piercing riveted joints

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Advances in Manufacturing 2024年第3期12卷 465-483页

作者： Yu-Xiang Ji Li Huang Qiu-Ren Chen Charles K.S.Moy Jing-Yi Zhang Xiao-Ya Hu Jian Wang Guo-Bi Tan Qing Liu Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing210009People’s Republic of China Design School Xi’an Jiaotong-Liverpool UniversitySuzhou215123JiangsuPeople’s Republic of China Materials Bigdata and Applications Division Materials Academy JitriSuzhou215131JiangsuPeople’s Republic of China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094People’s Republic of China

This paper presents a new machine learning-based calibration framework for strength simulation models of self-piercing riveted(SPR)*** simulations were conducted through the integrated modeling of SPR joints from process to performance,while physical quasi-static tensile tests were performed on combinations of DP600 high-strength steel and 5754 aluminum alloy sheets under lap-shear loading conditions.A sensitivity study of the critical simulation parameters(e.g.,friction coefficient and scaling factor)was conducted using the controlled variables method and Sobol sensitivity analysis for feature ***,machine-learning-based surrogate models were used to train and accurately represent the mapping between the detailed joint profile and its load-displacement *** of the simulation model is defined as a dual-objective optimization task to minimize errors in key load displacement features between simulations and experiments.A multi-objective genetic algorithm(MOGA)was chosen for *** three combinations of SPR joints illustrated the effectiveness of the proposed framework,and good agreement was achieved between the calibrated models and experiments.

关键词： Machine learning Self-piercing riveting(SPR) Sensitivity analysis Multi-objective optimization

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Fine-particle separation in heavy metal soil remediation using innovative hydrocyclone technology

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science of the Total Environment 2025年 971卷 179062页

作者： Zhang, Ruiqi Xing, Leyao Li, Yang Shen, Ran Yang, Jixian Gao, Lixin School of Architecture and Design Harbin Institute of Technology Harbin150090 China Key Laboratory of Cold Region Urban and Rural human Settlement Environment Science and Technology Ministry of industry and Information Technology Harbin150090 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China

Heavy metal pollution in soils poses significant threats to ecosystems and human health. Traditional remediation methods (such as phytoremediation, thermal treatment, and electrokinetic remediation) are frequently limited by high costs and low efficiency. This study presents a novel approach using a small-scale hydrocyclone designed through numerical simulations to effectively separate fine-particle-contaminated soil. While heavy metals primarily adhere to particles smaller than 20 μm, previous studies have focused on rough separation of particles up to 200 μm. Our design innovation focuses specifically on the key particle size range of 20 μm. Using the Reynolds Stress Model (RSM), Volume of Fluid model, and discrete phase model, we investigated the effects of vortex finder diameter on flow field and classification efficiency and analyzed particle trajectories and separation performance. Under optimal conditions (1:25 water-to-soil ratio, 1.1 m3/h flow rate), the © 2025

关键词： Soil pollution

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Construction of 3-Azabicyclo[3.1.0]hexane Backbone by the Reaction of Allenes with Allylamines via Tandem Michael Addition and Copper-Mediated Oxidative Carbanion Cyclization

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Chinese Journal of Chemistry 2021年第3期39卷 666-670页

作者： Hui Xu Teng Han Xiaoyan Luo Wei-Ping Deng Shanghai Key Laboratory of New Drug Design and School of Pharmacy East China University of Science and Technology130 Meilong RoadShanghai 200237China

Main observation and conclusion A facile synthetic method for the construction of 3-azabicyclo[3.1.0]hexane in the presence of copper catalyst system was *** reaction proceeds through Michael addition of allylamines with allenes followed by copper-mediated intramolecular oxidative carbanion 5-exo-trig radical cyclization,affording potential biologically active 3-azabicyclo[3.1.O]hexane derivatives in moderate to high yields(42%-85%).

关键词： Oxidative coupling Allenes Allylamine 3-Azabicyclo[3,1,0]hexane Miachel addition

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Analysis and Optimization of Flow-Guided Structure Based on Fluid-Structure Interaction

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1573-1584页

作者： Yue Cui Liyuan Wang Jixing Ru Jian Wu Key Laboratory of Intelligent Equipment Digital Design and Process Simulation Hebei ProvinceTangshan UniversityTangshan063000China Department of Intelligent Manufacturing Tangshan Vocational College of Science and TechnologyTangshan063001China Beijing Materials Handling Research Instituted Co. Ltd.Beijing100010China

Gases containing sulfur oxides can cause corrosion and failure of bellows used as furnace blowers in high-temperature *** order to mitigate this issue,the behavior of an effective blast furnace blower has been examined in ***,the Sereda corrosion model has been introduced to simulate the corrosion rate of the related bellows taking into account the effects of temperature and SO_(2) gas;such results have been compared with effective measurements;then,the average gas velocity in the pipeline and the von Mises stress distribution of the inner draft tube have been analyzed using a Fluid-Structure Interaction ***,the semi-closed internal corrosion environment caused by a 5 mm radial gap between the inner draft tube and the bellows has been *** gas flow rate in the residential space has been found to be low(0.5 ms–this value leads to a stable semi-closed internal corrosion environment for exhaust gas exchange);water phase in the exhaust gas is prone to accelerate the corrosion *** this basis,a bellows with an optimized inner draft tube has proposed,which includes corrosion-resistant honeycomb buffer rings.

关键词： Bellows optimized inner draft tube FSI(Fluid-structure interaction) corrosion rate

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