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Mechanical properties of steel mesh in anchor-mesh support for rocky tunnels

Journal of Mountain Science 2024年第10期21卷 3487-3502页

作者： SUN Keguo JIA Jinglong XU Weiping ZHANG Yu WANG Jinjin WANG Yichao liu yongkui Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSchool of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Intelligent Geotechnics and Tunnelling Chengdu 610031China Chengdu Rail Transit Group Co. Ltd.Chengdu 610036China China Railway 14th Bureau Group 2nd Engineering Corporation Limited China Railway Construction Corporation LimitedTaian 271000China

Underground geotechnical engineering encounters persistent challenges in ensuring the stability and safety of surrounding rock structures, particularly within rocky tunnels. Rock reinforcement techniques, including the use of steel mesh, are critical to achieving this goal. However, there exists a knowledge gap regarding the comprehensive understanding of the mechanical behavior and failure mechanisms exhibited by steel mesh under diverse loading conditions. This study thoroughly explored the steel mesh's performance throughout the entire loading-failure process, innovating with detailed analysis and modeling techniques. By integrating advanced numerical modeling with laboratory experiments, the study examines the influence of varying reinforcement levels and geometric parameters on the steel mesh strength and deformation characteristics. Sensitivity analysis, employing gray correlation theory, identifies the key factors affecting the mesh performance, while a BP (Backpropagation) neural network model predicts maximum vertical deformation with high accuracy. The findings underscore the critical role of steel diameter and mesh spacing in optimizing peak load capacity, displacement, and energy absorption, offering practical guidelines for design improvements. The use of a Bayesian Regularization (BR) algorithm further enhances the predictive accuracy compared to traditional methods. This research provides new insights into optimizing steel mesh design for underground applications, offering an innovative approach to enhancing structural safety in geotechnical projects.

关键词： Tunnel Steel mesh BP neural network Anchor-mesh support Rock reinforcement technique

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基于深度强化学习的机器人轴孔装配策略仿真研究

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系统仿真学报 2024年第6期36卷 1414-1424页

作者：朱子璐刘永奎张霖王力翚林廷宇西安电子科技大学机电工程学院陕西西安710071 北京航空航天大学自动化科学与电气工程学院北京100191 瑞典皇家理工学院生产工程系斯德哥尔摩25175 北京仿真中心北京市复杂产品先进制造系统工程技术研究中心北京100854

针对现有轴孔装配方法存在的依赖于精确的接触状态模型、数据采集困难、采样效率低、安全性差等问题,提出了一种基于DRL的机器人轴孔装配策略仿真研究方法。搭建了基于ROSGazebo机器人轴孔装配仿真环境,提出了基于最小二乘法对力/力矩... 详细信息

针对现有轴孔装配方法存在的依赖于精确的接触状态模型、数据采集困难、采样效率低、安全性差等问题,提出了一种基于DRL的机器人轴孔装配策略仿真研究方法。搭建了基于ROSGazebo机器人轴孔装配仿真环境,提出了基于最小二乘法对力/力矩传感器进行重力补偿的方法;基于RL的范式对轴孔装配问题建模,并提出了一种基于SAC(soft actor-critic)算法的机器人轴孔装配方法;通过ROS建立了仿真环境与深度强化学习算法的通信机制。实验结果表明:该算法能够使机器人自主且柔顺地完成轴孔装配任务,并具有较好的泛化性。

关键词：轴孔装配 DRL 柔顺控制装配策略仿真 ROS-Gazebo仿真环境

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Agent-based simulation platform for cloud manufacturing

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International Journal of Modeling, Simulation, and Scientific Computing 2017年第3期8卷 1-20页

作者： Chun Zhao Lin Zhang yongkui liu Zhiqiang Zhang Gengjiao Yang Bo Hu Li School of Automation Science and Electrical Engineering Beihang University Xueyuan Street 37Haidian District 100083BeijingP.R.China Engineering Research Center of Complex Product Advanced Manufacturing Systems Ministry of Education 100191BeijingP.R.China

Cloud manufacturing is a new manufacturing paradigm which creates an open environment for transactions among the *** on transaction modes and regularities in a cloud manufacturing environment is important for promoting the applications of cloud *** this end,we design and implement a simulation platform according to the typical transaction processes of enterprises in the cloud manufacturing *** the simulation platform,enterprises are encapsulated into Service Agents,and thus the activities of service agents can be used to describe enterprise *** defining different rules,simulations for different business models can be *** descriptions of the platform architecture,functions,and key technologies are *** feasibility of the simulation platform is verified through a case study.

关键词： Cloud manufacturing simulation platform service agent transaction process

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Transcriptome Analysis Provides New Insights into Host Response to Hepatopancreatic Necrosis Disease in the Black Tiger Shrimp Penaeus monodon

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Journal of Ocean University of China 2021年第5期20卷 1183-1194页

作者： ZHAO Jichen CHEN Xieyan HE Zihao CHEN Guoliang LIN Zhaojian liu yongkui SUN Chengbo WANG Wei College of Fisheries Guangdong Ocean UniversityZhanjiang 524088China Guangdong Haimao Investment Co. Ltd.Zhanjiang 524088China

The hepatopancreatic necrosis disease(HPND)is a common shrimp *** of the black tiger shrimp Penaeus monodon has suffered with the frequent outbreak of *** the molecular mechanisms of host response to HPND is of pivotal importance for improving its farming *** this study,the RNA-Seq platform was utilized to investigate transcriptomic changes of the hepatopancreas in pond-cultured *** with HPND symptoms.A total of 62071 genes with an average length of 953 bp were obtained,and a lot of simple sequence repeat(SSR)loci related to these genes were ***,5204 differentially expressed genes(DEGs)were detected between healthy shrimp and HPND shrimp,with 3399 genes upregulated and 1,805 genes *** genes had a wide range of biological functions,and several well-known immunerelated genes including integrin alpha 5,integrin beta 1,C type lectin and catalase were among the *** signaling pathways including the extracellular matrix(ECM)receptor interaction,phagosome and lysosome pathways were significantly upregulated in HPND-infected shrimps,indicating their involvement in the immune responses of shrimp against *** data obtained in this study offers new insights into the molecular mechanisms of shrimp host response to HPND disease,and provides a resource for molecular marker development and genetic breeding studies of ***.

关键词： Penaeus monodon shrimp HPND transcriptome hepatopancreas

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Smart manufacturing systems for Industry 4.0： Conceptual framework, scenarios, and future perspectives

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Frontiers of Mechanical Engineering 2018年第2期13卷 137-150页

作者： Pai ZHENG Honghui WANG Zhiqian SANG Ray Y. ZHONG yongkui liu Chao liu Khamdi MUBAROK Shiqiang YU Xun XU Department of Mechanical Engineering University of Auckland Auckland New Zealand

Information and communication technology is undergoing rapid development, and many disruptive technologies, such as cloud computing, Internet of Things, big data, and artificial intelligence, have emerged. These technologies are permeating the manufacturing industry and enable the fusion of physical and virtual worlds through cyber-physical systems （CPS）, which mark the advent of the fourth stage of industrial production （i.e., Industry 4.0）. The widespread application of CPS in manufacturing environments renders manufacturing sys- tems increasingly smart. To advance research on the implementation of Industry 4.0, this study examines smart manufacturing systems for Industry 4.0. First, a conceptual framework of smart manufacturing systems for Industry 4.0 is presented. Second, demonstrative scenarios that pertain to smart design, smart machining, smart control, smart monitoring, and smart scheduling, are presented. Key technologies and their possible applications to Industry 4.0 smart manufacturing systems are reviewed based on these demonstrative scenarios. Finally, challenges and future perspectives are identified and discussed.

关键词： Industry 4.0 smart manufacturing systems Intemet of Things cyber-physical systems big data analytics framework

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Directional design and synthesis of high-yield hollow Fe-MFI zeolite encapsulating ultra-small Fe_(2)O_(3) nanoparticles by using mother liquid

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Nano Research 2021年第11期14卷 4304-4313页

作者： Yi Zhai Fumin Wang Xubin Zhang Guojun Lv Yuzhou Wu Tao Jiang Qing Zhang Mengyue Li Mengyao Li yongkui liu School of Chemical Engineering and Technology Tianjin UniversityTianjin300350China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

How to directionally design the hollow zeolite via a green route is of great significance. Here, we successfully synthesized the hollow Fe-silicate-1 encapsulated ultra-small Fe_(2)O_(3) nanoparticles (2.5 nm) with higher yield (85.2%) by mother liquid than traditional dissolution-recrystallization for the first time, which was achieved by precisely regulating the number and distribution of defects in zeolite and cleverly utilizing the TPAOH and nuclei in mother liquor. The effects of synthetic temperature, synthetic period and addition amount of parent zeolite on the formation of hollow zeolite have been investigated and the effect of synthetic conditions on the defects in parent zeolite has been also firstly quantified. The corresponding formation mechanism has been proposed. The abundant inner defects provided by the zeolite synthesized at 130 °C for 1 day and large amount of TPAOH remaining in mother liquid are conducive to the formation of hollow zeolite. Meanwhile, both parent zeolite and nuclei (4-, 5-member rings and structure units) in mother liquid obtained at 130 °C play the crucial roles in enhancing the zeolite yield. Notably, Fe_(2)O_(3) nanoparticles could decompose into small fragments by the interaction with nuclei in mother liquid. Partial ultra-small Fe_(2)O_(3) nanoparticles would be encapsulated in cavity and the rest could be inserted in the zeolite framework, which is significantly different from the conventional dissolution-recrystallization mechanism. The obtained encapsulated catalyst shows the superior catalytic performance and stability in phenol and tetracycline degradation reactions.

关键词： mother liquid hollow zeolite high yield defect sites degradation reaction

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An efficient approach for the treatment of radioactive waste perfluoropolyether lubricants via a synergistic effect of thermal catalysis and immobilization

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Journal of Environmental Sciences 2024年第2期136卷 512-522页

作者： Xinhang Du Wenhua Tong Xinyu Zhou Jia Luo Yuqiu liu Yabo Wang Panyu Li yongkui Zhang Department of Pharmaceutical&Biological Engineering School of Chemical EngineeringSichuan UniversityChengdu 610065China

Perfluoropolyether(PFPE)lubricants are a kind of high-molecular polymer with many excellent ***,the use of PFPEs in the nuclear industry can lead to partial decomposition and carrying radionuclides,resulting in a large amount of radioactive waste PFPE lubricants ***,radioactive waste PFPE lubricants are difficult to be effectively treated due to their high stability,the risk of possible leakage of radionuclides,and hypertoxic fluorine-containing *** this study,without any precedent,a strategy of Mn O_(2)-catalyzed decomposition and Na_(2)CO_(3)-immobilized conversion was proposed for PFPE lubricant decomposition and fluorine immobilization simultaneously based on the Lewis acid-base and oxygen vacancies concept.A high fluorine conversion efficiency of 95.4%was ***,the mechanism of decomposition suggested that Mn O_(2)mainly provided Lewis acid sites and attacked the(basic)fluorine or oxygen atoms in PFPE *** decomposition of PFPE chains was proceed down and volatile fluorine-containing gas was released by partial electron transfer,intramolecular disproportionation reaction,and unzipping ***,gas by-products could be further oxidized and then immobilized into fluoride salts by carbonate solid ***,this study provides a simple,safe,and potentially practical strategy for the harmless conversion of refractory fluorinated organic wastes,especially perfluoropolymers.

关键词： Perfluoropolyether lubricants Catalyzed decomposition Fluorine-containing gas Immobilized conversion Fluoride

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New structure transistors for advanced technology node CMOS ICs

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National Science Review 2024年第3期11卷 24-41页

作者： Qingzhu Zhang yongkui Zhang Yanna Luo Huaxiang Yin Integrated Circuit Advanced Process R&D Center Institute of Microelectronics of Chinese Academy of Sciences(IMECAS) State key Lab of Fabrication Technologies for Integrated Circuits Institute of Microelectronics of Chinese Academy of Sciences School of Integrated Circuits University of Chinese Academy of Sciences

Over recent decades, advancements in complementary metal-oxide-semiconductor integrated circuits(ICs)have mainly relied on structural innovations in transistors. From planar transistors to the fin field-effect transistor(FinFET) and gate-all-around FET(GAAFET), more gate electrodes have been added to three-dimensional(3D) channels with enhanced control and carrier conductance to provide higher electrostatic integrity and higher operating currents within the same device footprint. Beyond the 1-nm node, Moore's law scaling is no longer expected to be applicable to geometrical shrinkage. Vertical transistor stacking, e.g. in complementary FETs(CFET), 3D stack(3DS) FETs and vertical-channel transistors(VFET), for enhanced density and variable circuit or system design represents a revolutionary scaling approach for sustained IC development. Herein, innovative works on specific structures, key process breakthroughs, shrinking cell sizes and design methodologies for transistor structure research and development are reviewed. Perspectives on future innovations in advanced transistors with new channel materials and operating theories are also discussed.

关键词： transistor CMOS GAAFET CFET 3DS FET

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文化认同及文化版图演化现象的社会计算模型

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计算机研究与发展 2013年第12期50卷 2590-2602页

作者：云健刘向东刘勇奎大连民族学院计算机科学与工程学院辽宁大连116600

文化认同以及由于文化认同感的演变结果与地理边界的不一致性在文化版图上形成的文化侵蚀现象、文化融合现象等文化安全问题是文化领域的核心问题之一.在社会计算方法引入之前,该问题是典型的不能假设、无法进行计算实验的社会科学问题... 详细信息

文化认同以及由于文化认同感的演变结果与地理边界的不一致性在文化版图上形成的文化侵蚀现象、文化融合现象等文化安全问题是文化领域的核心问题之一.在社会计算方法引入之前,该问题是典型的不能假设、无法进行计算实验的社会科学问题.将社会计算方法引入这一核心问题,使对该问题的实验研究进入到一个无风险的实验空间;运用基于多智能体的人工社会建模技术,确定了若干可刻画跨文化交流或文化内部环境稳定性的计算因子、文化抗消解惯性因子、文化身份状态因子、异族群的智能体间地理距离因子、"安土重迁"心理特征因子及"安土重迁"行为特征因子等;在此基础上,给出了刻画文化认同及其版图边界演变过程中文化侵蚀、文化融合与文化保护等现象的社会计算模型,并进行了大量的社会计算实验.实验结果表明:所选取的各种计算因子都是影响文化认同及其版图演化过程的重要因素,但作用各不相同;文化认同感演化的诸多规律也由该模型得出.该计算模型今后可在各类文化保护方案设计和方案效果评估等实际社会工作中发挥作用.

关键词：社会计算文化安全文化认同文化版图演化计算实验人工社会

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图形裁剪算法研究

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计算机工程与应用 2005年第21期41卷 18-23页

作者：刘勇奎大连民族学院计算机图形图像技术研究所大连民族学院计算机系大连116600

本文介绍和研究直线、曲线和多边形的最新裁剪算法,包括作者近期的研究成果。首先对于矩形窗口,介绍了直线裁剪算法,圆和椭圆裁剪算法以及参数曲线的裁剪算法。然后,介绍了多边形窗口的直线裁剪算法和多边形窗口的多边形裁剪算法以及区... 详细信息

本文介绍和研究直线、曲线和多边形的最新裁剪算法,包括作者近期的研究成果。首先对于矩形窗口,介绍了直线裁剪算法,圆和椭圆裁剪算法以及参数曲线的裁剪算法。然后,介绍了多边形窗口的直线裁剪算法和多边形窗口的多边形裁剪算法以及区域间的“交”、“差”和“并”操作。最后,介绍了圆形和椭圆形窗口的直线裁剪算法。

关键词：计算机图形学裁剪曲线多边形算法

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