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Construction of spontaneously polarized ceramic via synergistic mechanical activation-Biomimetic mineralization for activating air and water

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Journal of Materials Science & Technology 2023年第34期165卷 132-142页

作者： wuxiang zhang Hongguang zhang Ying Zhu Zuqiang Huang Yanjuan zhang Tao Gan Huayu Hu Yuben Qin School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous RegionNanning 530004China

Spontaneously polarized crystals with intrinsic electric dipole moment have attracted immense interest as excellent functional materials for extensive applications.It is of great significance to engineer sustainable spontaneously polarized materials with fascinating characteristics and performance for activating air and water.Herein,a novel strategy based on the synergy of mechanical activation(MA)and biomimetic mineralization(BM)was created to construct spontaneously polarized ceramic.MA induced the structural damage of clay and promoted the dissolution of ions and the release of free proteins,contributing to the formation of silicate precursor in BM process.After high temperature firing,the silicate precursor in clay was converted to form KCa_(3)AlCa_(3)Si_(4)O_(16)(hexagonal crystal system,L^(6)symmetry type,and P63 space group)in the resulting spontaneously polarized ceramic.The non-centrosymmetric structure of KCa_(3)AlCa_(3)Si4O_(16)and the high intrinsic electric dipole moments contributed by K(1)polyhedrons resulted in high spontaneous polarization(0.2322μC/cm^(2))and far-infrared emissivity(0.951)of spontaneously polarized ceramic.In air,spontaneously polarized ceramic can activate H_(2)O and O_(2)molecules to form negative air ions owing to surface electric field.In water,spontaneously polarized ceramic can disaggregate large water clusters to form small water clusters ascribed to surface electric field and far-infrared emission;water pH can be regulated from weak acidity to approximate neutrality via the capture of electrons by H+ions to produce releasable hydrogen gas.This work provides great promise for rational design and synthesis of spontaneously polarized materials for functional applications.

关键词： Ceramic Spontaneous polarization Mechanical activation Biomimetic mineralization Activation of air and water

Overview of current design and analysis of potential theories for automated fibre placement mechanisms

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Chinese Journal of Aeronautics 2022年第4期35卷 1-13页

作者： wuxiang zhang Fei LIU Tao JIANG Minghui YI Weiqiang CHEN Xilun DING School of Mechanical Engineering and Automation Beihang University37 Xueyucm RoadBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 315832China Beijing Weixing Manufacturing Plant Co. LtdBeijing 100191China

Automated fibre placement(AFP) systems have successfully intensified the demand for high-quality composite component manufacturing in both the military and civilian fields. One of the main elements of these systems is the AFP mechanism for accomplishing individual fibre delivery,clamp/cut/restart(CCR) and the consolidation process, and it consists of several functional submechanisms presenting strong coupling relationships and motion sequences. This review aims to summarize the development of AFP mechanisms and the associated research achievements and provide insight into the research challenges in promoting innovative design in such mechanisms. The systematic development of AFP systems is reviewed in detail, and subsequently, engineering tendency and the general principle of AFP mechanisms are introduced. Focusing on the mechanism design of AFP sub-mechanisms, including the creel assembly CCR and compaction mechanisms,the mechanical schemes as well as the AFP process parameter control are discussed. To improve system reliability and fully optimise AFP mechanisms, the essential theoretical foundation for AFP mechanisms are provided. It is believed that this attempt will help to change the design and optimisation of similar complete mechanisms. Based on the reviewed research, overall remarks and perspectives are presented to serve as a guide for exploring the possibility of novel easy-to-use and cost-effective integrated AFP applications.

关键词： Automated fibre placement systems Sub-mechanisms Structure design Layup performance Theoretical foundation

Review of human–robot coordination control for rehabilitation based on motor function evaluation

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Frontiers of Mechanical Engineering 2022年第2期17卷 37-50页

作者： Di SHI Liduan WANG Yanqiu zhang wuxiang zhang Hang XIAO Xilun DING School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China School of Rehabilitation Medicine Weifang Medical UniversityWeifang 261053China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100191China

As a wearable and intelligent system, a lower limb exoskeleton rehabilitation robot can provide auxiliary rehabilitation training for patients with lower limb walking impairment/loss and address the existing problem of insufficient medical resources. One of the main elements of such a human–robot coupling system is a control system to ensure human–robot coordination. This review aims to summarise the development of human–robot coordination control and the associated research achievements and provide insight into the research challenges in promoting innovative design in such control systems. The patients’ functional disorders and clinical rehabilitation needs regarding lower limbs are analysed in detail, forming the basis for the human–robot coordination of lower limb rehabilitation robots. Then, human–robot coordination is discussed in terms of three aspects: modelling, perception and control. Based on the reviewed research, the demand for robotic rehabilitation, modelling for human–robot coupling systems with new structures and assessment methods with different etiologies based on multi-mode sensors are discussed in detail, suggesting development directions of human–robot coordination and providing a reference for relevant research.

关键词： human–robot coupling lower limb rehabilitation exoskeleton robot motor assessment dynamical model perception

A Review on Lower Limb Rehabilitation Exoskeleton Robots

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Chinese Journal of Mechanical Engineering 2019年第4期32卷 2-12页

作者： Di Shi wuxiang zhang Wei zhang Xilun Ding School of Mechanical Engineering and AutoMation Beihang University Beijing 100191 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100191 China.

Lower limb rehabilitation exoskeleton robots integrate sensing, control, and other technologies and exhibit the characteristics of bionics, robotics, information and control science, medicine, and other interdisciplinary areas. In this review, the typical products and prototypes of lower limb exoskeleton rehabilitation robots are introduced and stateof-the-art techniques are analyzed and summarized. Because the goal of rehabilitation training is to recover patients’ sporting ability to the normal level, studying the human gait is the foundation of lower limb exoskeleton rehabilitation robot research. Therefore, this review critically evaluates research progress in human gait analysis and systematically summarizes developments in the mechanical design and control of lower limb rehabilitation exoskeleton robots. From the performance of typical prototypes, it can be deduced that these robots can be connected to human limbs as wearable forms;further, it is possible to control robot movement at each joint to simulate normal gait and drive the patient’s limb to realize robot-assisted rehabilitation training. Therefore human–robot integration is one of the most important research directions, and in this context, rigid-flexible-soft hybrid structure design, customized personalized gait generation, and multimodal information fusion are three key technologies.

关键词： Control method Lower limb exoskeleton Mechanical design Rehabilitation robot

Recent development on innovation design of reconfigurable mechanisms in China

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Frontiers of Mechanical Engineering 2019年第1期14卷 15-20页

作者： wuxiang zhang Shengnan LU Xilun DING School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

Reconfigurable mechanisms can deliberately reconfigure themselves by rearranging the connectivity of components to meet the different requirements of tasks.Metamorphic and origami-derived mechanisms are two kinds of typical reconfigurable mechanisms,which have attracted increasing attention in the field of mechanisms since they were proposed.Improving the in dependent design level,innovation,and international competitive powers of reconfigurable mechanical products is important.Summarizing related significant innovation research and application achievements periodically will shed light on research directions and promote academic exchanges.This paper presents an overview of recent developments in innovation design of reconfigurable mechanisms in China,including metamorphic and origami mechanisms and their typical applications.The future development trends are analyzed and forecasted.

关键词： innovation design reconfigurable mechanisms metamorphic mechanisms origami-derived mechanisms development trends

九翅豆蔻叶绿体基因组特征及其密码子偏好性分析

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基因组学与应用生物学 2024年第1期43卷 17-30页

作者：傅武祥郭雨桐张雪梅马占霞滇西应用技术大学普洱茶学院普洱665000 云南农业大学农学与生物技术学院昆明650201 中国科学院西双版纳热带植物园勐仑666303

为探究九翅豆蔻(Amomum maximum)叶绿体全基因组(chloroplast DNA,cpDNA)特征和密码子使用偏好性,本研究利用Illumina HiSeq测序平台对九翅豆蔻叶绿体全基因组进行测序,通过组装与注释得到叶绿体基因组全序列,使用MISA、IQTREE和CodonW... 详细信息

为探究九翅豆蔻(Amomum maximum)叶绿体全基因组(chloroplast DNA,cpDNA)特征和密码子使用偏好性,本研究利用Illumina HiSeq测序平台对九翅豆蔻叶绿体全基因组进行测序,通过组装与注释得到叶绿体基因组全序列,使用MISA、IQTREE和CodonW等软件对九翅豆蔻叶绿体全基因组的微卫星位点(microsatellite site)、密码子偏好性及系统发育进行分析。结果表明,九翅豆蔻完整叶绿体全基因组长度为163602 bp,基因组平均G+C含量为36.1%,其大单拷贝(large single copy,LSC)区和小单拷贝(small single copy,SSC)区长度分别为88626 bp和15426 bp,两个反向重复(inverted repeat,IR)区长度为29775 bp。九翅豆蔻叶绿体基因组共编码132个基因,包含86个蛋白编码基因、38个tRNA基因和8个rRNA基因。叶绿体基因组序列上共检测到132个简单重复序列(simple sequence repeat,SSR)位点。其中单核苷酸、二核苷酸、三核苷酸、四核苷酸和五核苷酸数量分别为65、35、5、24、3个,绝大多数属于单碱基重复的A/U类型。系统发育分析显示九翅豆蔻在豆蔻属(Amomum)植物中单独聚为一支。这为九翅豆蔻种质资源鉴定、评价及物种形成机制研究奠定了基础。

关键词：九翅豆蔻叶绿体基因组微卫星位点密码子偏好性系统发育分析

纳米限域强化催化降解典型环境污染物的研究进展

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复合材料学报 2024年第4期41卷 1726-1736页

作者：李子涵张武翔郭庆勇史明月包美烁杨福潘建明江苏科技大学环境与化学工程学院镇江212003 江苏大学化学化工学院镇江212013

环境水污染对人类健康和生态环境构成了潜在的威胁,水资源的保护和污染治理是当前全球面临的重要环境问题。然而,传统水处理技术在处理水体中有机污染物时存在一定的限制,如去除机制、去除效率、选择性和稳定性等。近年来,纳米限域催化... 详细信息

环境水污染对人类健康和生态环境构成了潜在的威胁,水资源的保护和污染治理是当前全球面临的重要环境问题。然而,传统水处理技术在处理水体中有机污染物时存在一定的限制,如去除机制、去除效率、选择性和稳定性等。近年来,纳米限域催化作为一种新兴技术在水处理领域引起了广泛关注。该技术通过纳米限域介导的强化催化,能够实现纳米材料内部的催化调控,在降解环境污染物方面展现了独特的优势。本文综述了纳米限域在热强化催化、光强化催化、电强化催化和膜强化催化降解典型环境污染物方面的研究进展。其中,对催化原理、催化效率及影响因素等进行总结,并展望了限域催化未的来研究方向和挑战。

关键词：纳米限域催化高级氧化技术降解有机污染物环境水污染

Fe-Co普鲁士蓝比色法检测过氧化氢和谷胱甘肽

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闽南师范大学学报（自然科学版） 2024年第2期37卷 52-63页

作者：叶佳佳张武翔倪建聪胡世荣闽南师范大学化学化工与环境学院福建漳州363000 江苏科技大学环境与化工学院江苏镇江212003

采用一锅水热法合成的Fe-Co普鲁士蓝类似物(PBAs)作为类过氧化物酶,基于H_(2)O_(2)与3,3',5,5'-四甲基联苯胺(TMB)的显色反应和GSH对氧化TMB(ox-TMB)的还原反应,建立一种用于H_(2)O_(2)和GSH定量分析的比色传感器.在H_(2)O_(2)为2.0~50... 详细信息

采用一锅水热法合成的Fe-Co普鲁士蓝类似物(PBAs)作为类过氧化物酶,基于H_(2)O_(2)与3,3',5,5'-四甲基联苯胺(TMB)的显色反应和GSH对氧化TMB(ox-TMB)的还原反应,建立一种用于H_(2)O_(2)和GSH定量分析的比色传感器.在H_(2)O_(2)为2.0~50μmol/L和GSH为6.6~50.63μmol/L范围内均表现出良好的线性关系,检测限分别为0.36和0.32μmol/L.

关键词：比色传感器 Fe-Co类普鲁士蓝谷胱甘肽过氧化氢一锅水热法

Design and Stability of Operating Mechanism for a Spacecraft Hatch

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Chinese Journal of Aeronautics 2009年第4期22卷 453-458页

作者： zhang wuxiang Ding Xilun Dai Jiansheng Institute of Roboticx Beijing University of Aeronautics and Astronautics Beijing 100191 China Mechanism and Robotics Department of Mechanical Engineering Kings College London University of London WC2R 2LS UK

This article introduces the working principles of a spacecraft hatch including its operating process and moving trajectory. On this basis, an operating mechanism is designed to execute automatic open and close action of the hatch and measure the operating torques. Analysis on the mechanism＇s configuration and topological structure of each phase of movement proves that it is a typical variable freedom mechanism. The mechanism manipulates the hatch in accordance with the moving trajectory requirements through configuration transformation. Kinematic analysis and simulation of some typical configurations show that the velocity differences among mechanism components themselves and the components and their abutting components could exert influences on its working stability during configuration transformation. To solve the problem, stability conditions of configuration transformation are proposed. Appropriate control models are established for the output velocity curves of the driving servo motor and solved based on the stability conditions and rules of movement. Results from another simulation demonstrate that the proposed control models ensure smooth configuration transform and stable operation.

关键词： spacecraft hatch mechanism configuration transformation variable freedom mechanism stability