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Practical Structural Design Approach of Multiconfiguration Planar Single‑Loop Metamorphic Mechanism with a Single Actuator

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Chinese Journal of Mechanical Engineering 2020年第5期33卷 19-33页

作者： Qiang Yang Guangbo Hao shujun li Hongguang Wang Haiyang li College of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Department of Electrical and Electronic Engineering University College CorkCork T12 K8AFIreland State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China

As a type of multiconfiguration mechanism that can operate in an under-actuated state,metamorphic mechanisms were proposed more than two decades ago and attracted significant *** on structural synthesis of metamorphic mechanisms tend to focus more on metamorphic techniques and the structural synthesis of source mechanisms for metamorphic *** designing different constraint architectures of metamorphic joints,multistructures can be obtained from the same source metamorphic *** determine the constraint architectures of metamorphic joints and their different assembly combinations,a kinematic status matrix and a corresponding constraint status matrix are constructed based on the metamorphic cyclogram of a source *** to the equivalent resistance gradient model and the constraint status matrix,an equivalent resistance matrix for the metamorphic joints is proposed.A structural synthesis matrix of the metamorphic mechanism is then obtained from the equivalent resistance matrix by deducing the constraint form vectors of the metamorphic ***,a kinematic diagram synthesis of the source metamorphic mechanism of a planar single-loop metamorphic mechanism is proposed,which is based on only the 14 one-or zero-degrees-of-freedom linkage *** entire structural design method of a metamorphic mechanism is based on the structural synthesis matrix and is presented as a systematic ***,the proposed structural design approach is illustrated by two examples to verify its feasibility and *** study provides an effective method for designing a practical multi-mobility and multiconfiguration planar single-loop metamorphic mechanism with a single actuator.

关键词： Metamorphic mechanism Structural design Form of metamorphic joints Multiconfiguration Equivalent resistance Single actuator

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Study on hydrodynamic diffusion law of the swelling particle slurry in karst pipeline

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Particuology 2024年第4期87卷 218-231页

作者： Bingchuan Cheng Haibo li Guangming Pan Runhuai Deng Yu'an Gong shujun Xu Kun Zhou Zhuo Zheng School of Civil Engineering Geotechnical and Structural Engineering Research CenterShandong UniversityJinan250061China The Fourth Prospecting of Shandong Coal Geology Bureau Weifang261000China China Railway 14th Bureau Group Corporation limited Jinan250101China School of Trafic Engineering Shandong Jianzhu University.Fengming RoadLingang Development ZoneJinan250101China

The swelling particle grouting material has demonstrated remarkable plugging effectiveness in high-pressure and large-flow burst water within karst ***,current research on the rheolog-ical model,flow computation theory,and plugging mechanism of this material is *** conven-tional grouting slurry diffusion process,using the liquid-liquid two-phase flow method,fails to accurately simulate high solubility slurry and particle *** address these limitations,this study established a precise constitutive model to describe the swelling particle slurry diffusion process in dynamic ***,a coupling calculation method was proposed to analyze the spatiotemporal heterogeneity of viscosity during slurry diffusion by considering the migration of slurry and the changes in *** investigate the interaction between particle swelling and flow field changes,a Compu-tational Fluid Dynamics-Discrete Element Method(CFD-DEM)coupling model was developed for the diffusion of swelling particle *** is demonstrated that slurry viscosity increases exponentially within the diffusion front as the particle swelling rate rises,and the drag force exhibits an intriguing behavior of initially increasing and then decreasing as the slurry flows through the ***-more,the CFD-DEM coupling model proved to be more accurate in describing viscosity distribution and diffusion distance compared to the finite element *** primary objective of this paper is to reveal the plugging mechanism and provide theoretical support for the engineering application of the swelling particle grouting material.

关键词： Karst pipeline Swelling particle grouting material Dynamic water diffusion Spatiotemporal variation of viscosity CFD-DEM coupling model

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Isolation and Identification of Fungi Carried by Tobacco Plants in Luoyang Area and Their Inhibitory Effect on Tobacco Soil-borne Pathogenic Fungi

Isolation and Identification of Fungi Carried by Tobacco Pla...

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中国植物病理学会2023年学术年会

作者：李涵 li shujun 康业斌 College of Horticulture and Plant Protection Henan University of Science and Technology

To identify the species of fungi carried by tobacco plants in the Luoyang area and to investigate the inhibitory effect of endophytic fungi on soil-borne pathogens of *** experiment was conducted in the tobacco fields ofLuoning,Yiyang and Ruyang counties in Luoyang *** tobacco plants were selected by the five-point sampling method or random sampling method and brought back to the laboratory during the cluster,vigorous and mature *** taxonomic status of the isolates was determined based on a combination of morphological observation and ITS-rDNA sequence *** inhibition of Phytophthora nicotianae,Fusarium oxysporum,Pythium aphanidermatum and Rhizoctonia solani by endophytic fungi was determined using a plate confrontation *** results showed that a total of 52 fungi were isolated and purified,and the fungi carried by the tobacco strains were identified as ***,***,***,***,***,*** and ***,of which *** and ***,*** and ***(Fei Zhouyang et al.,2009) and ***(Zhou Kaiyi et al.,2015) are endophytic *** percentages of inhibition of mycelial growth of ***,***,*** and *** by *** were 50.23%,52.29%,41.37% and 52.67%,and the percentages of inhibition of mycelial growth of ***,***,*** and *** by *** were 51.72%,53.13%,40.53% and44.86%,The four soil-borne pathogenic fungi were not inhibited by ***,Aniger and ***,*** and *** have been reported in the literature as the causal agent of tobacco erysipelas(Shew H D,1991);*** mixed with *** and *** causes Fusarium root rot of tobacco(Sang Weijun et al.,1998).

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“变电+充电”多功能站的负荷安全裕度评估方法

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农村电气化 2024年第7期 20-24页

作者：王蕾孙渤岩李树军侯鑫潼秦方宇孙明鹏国家电网天津市电力公司城西供电分公司天津南开300072 清华四川能源互联网研究院四川成都610042

随着电动汽车快速发展,城市大型充电站的站址愈发紧张,与110 kV或35 kV变电站集成的“变电+充电”多功能站(简称变充电多功能站)可以充分利用已有变电站的空间资源,成为一种可行选择。然而,快速普及的电动汽车-电网互动技术为变充电多... 详细信息

随着电动汽车快速发展,城市大型充电站的站址愈发紧张,与110 kV或35 kV变电站集成的“变电+充电”多功能站(简称变充电多功能站)可以充分利用已有变电站的空间资源,成为一种可行选择。然而,快速普及的电动汽车-电网互动技术为变充电多功能站的安全评估引入了新的边界条件,传统的变电站负荷裕度评估方法已不再适用。文章提出一种考虑车网互动以及N–1准则的变充电多功能站负荷安全裕度评估方法,首先构建了变充电多功能站的系统安全模型,然后采用降维投影可视化方法,进一步提出变压器负荷安全裕度的指标,最后结合实际电网算例验证方法有效性。本文方法为以变充电多功能站及其所属的城市配电网安全分析提供了理论基础。

关键词：变充电多功能站电力变压器负荷安全裕度车网互动

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Longitudinal Compression Behavior of Functionally Graded Ti–6Al–4V Meshes

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Journal of Materials Science & Technology 2016年第11期32卷 1098-1104页

作者： Shangzhou Zhang Cong li Wentao Hou Shuo Zhao shujun li School of Environmental and Materials Engineering Yantai University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The compressive deformation behavior in the longitudinal direction of graded Ti–6Al–4V meshes fabricated by electron beam melting was investigated using experiments and finite element methods（FEM）.The results indicate that the overall strain along the longitudinal direction is the sum of the net strain carried by each uniform mesh constituent and the deformation behavior fits the Reuss model well. The layer thickness and the sectional area have no effect on the elastic modulus, whereas the strength increases with the sectional area due to the edge effect of each uniform mesh constituent. By optimizing3 D graded/gradient design, meshes with balanced superior properties, such as high strength, energy absorption and low elastic modulus, can be fabricated by electron beam melting.

关键词： Graded Ti–6Al–4V meshes Electron beam melting Reuss model Compressive deformation Edge effect

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Electrochemical behavior of open-cellular structured Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid:the significance of pore characteristics

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Journal of Materials Science & Technology 2022年第2期97卷 272-282页

作者： Xin Gai Rui liu Yun Bai shujun li Yang Yang Shenru Wang Jianguo Zhang Wentao Hou Yulin Hao Xing Zhang Rui Yang R.D.K.Misra Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Department of Orthopedic Surgery Peking Union Medical College Hospital(PUMCH)Peking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China Department of Metallurgical Materialsand Biomedical EngineeringThe University of Texas at El Paso500W.University AvenueEl PasoTX 79968United States

The cellular structured titanium alloys have attracted significant attention for implants because of their lower Young’s modulus,which is comparable to human bone and has the capability of providing space for bone tissue ***,there is a gap in the knowledge in regard to the relationship between the pore characteristics and the electrochemical performance of open-cellular structured titanium *** this study,we elucidate the influence of pore characteristics on the electrochemical performance of open-cellular structured Ti-6Al-4V alloys produced by electron beam melting(EBM).Intriguingly,the passive film formed on cellular structured Ti-6Al-4V alloy with a larger pore size was more stable and protective,and the corrosion performance was superior compared to the samples with a smaller pore size in phosphate buffered saline(PBS),mainly because of relatively smaller exposed surface area and unlimited flow of ***,in acidic PBS containing fluoride ions,the pore characteristics did not play an important role in the corrosion *** was considered that the protective film breaks down such that the corrosion performance of cellular structured alloys was comparable to each other in this harsh environment.

关键词： Cellular structure Ti-6Al-4V Electron beam melting Corrosion resistance Fluoride ion

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Molecular Epidemiological Study of a Human Brucellosis Outbreak—Weihai City,Shandong Province,China,2022

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China CDC weekly 2024年第12期6卷 230-234页

作者： Yan li Yifan Yu Jian Zhao shujun Ding Guoying Zhang Xiaolin Yu Zengqiang Kou Shandong Provincial Center for Disease Control and Prevention Jinan CityShandong ProvinceChina Shandong First Medical University Shandong Academy of Medical SciencesJinan CityShandong ProvinceChina Weihai Municipal Center for Disease Control and Prevention Weihai CityShandong ProvinceChina

What is already known about this topic?Brucellosis,mainly caused by Brucella melitensis(***),is regarded as a significant zoonotic disease in *** Weihai,located at the eastern end of the Shandong Peninsula,brucellosis has been in a low epidemic phase for the past five *** is added by this report?This was the initial report of a brucellosis outbreak in the last five *** of *** bv.3 from Weihai and other cities showed a close genetic relationship,suggesting a potential common *** are the implications for public health practice?Epidemiological investigations depend on standardized and effective molecular typing methods and analysis tools for public health laboratories to identify and trace *** the circulation patterns of livestock in free-range households in heavily affected areas is essential for controlling the spread of brucellosis.

关键词： Shandong China. break

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Effect of Elastic Modulus on Biomechanical Properties of Lumbar Interbody Fusion Cage

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Journal of Materials Science & Technology 2009年第3期25卷 325-328页

作者： Yue Zhu Fusheng li shujun li Yulin Hao Rui Yang Department of Orthopaedics the First Affiliated Hospital of China Medical University Shenyang 110001 China Department of Bone Tumor The Peoplers Hospital of Liaoning Province Shenyang 110016 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

This work focuses on the influence of elastic modulus on biomechanical properties of lumbar interbody fusion cages by selecting two titanium alloys with different elastic modulus. They were made by a new β type alloy with chemical composition of Ti-24Nb-4Zr-7.6Sn having low Young＇s modulus -50 GPa and by a conventional biomedical alloy Ti-6Al-4V having Young＇s modulus -110 GPa. The results showed that the designed cages with low modulus （LMC） and high modulus （HMC） can keep identical compression load -9.8 kN and endure fatigue cycles higher than 5× 10^6 without functional or mechanical failure under 2.0 kN axial compression. The anti-subsidence ability of both group cages were examined by axial compression of thoracic spine specimens （T9-T10） dissected freshly from the calf with averaged age of 6 months. The results showed that the LMC has better anti-subsidence ability than the HMC （p〈0.05）. The above results suggest that the cage with low elastic modulus has great potential for clinical applications.

关键词： Titanium alloy Lumbar Interbody fusion cage Biomechanics

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Transition metal-mediated catalytic properties of gold nanoclusters in aerobic alcohol oxidation

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Nano Research 2018年第4期11卷 2139-2148页

作者： Chaolei Zhang Yongdong Chen Hong Wang Zhimin li Kai Zheng shujun li Gao li College of Chemistry and Chemical Engineering Southwest Petroleum University Chengdu 610500 China Gold Catalysis Research Center State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Heteroatom dopants can greatly modify the electronic and physical properties and catalytic performance of gold nanoclusters. In this study, we investigate the catalytic activity of [Au25-x（PET）18-xM]NH3 （PET = 2-phenylethanethiolate, and M = Cu, Co, Ni, and Zn） nanoclusters in aerobic alcohol oxidation. The [Au25-xPET）18-xM]NH3 nanoclusters are thoroughly characterized by matrix assisted laser desorption ionization （MALDI） mass spectrometry, X-ray photoelectron spectroscopy （XPS）, Fourier transform infrared spectroscopy （FT-IR）, and inductively coupled plasma-mass spectrometry （ICP-MS）. The XPS analyses suggest that the transition metals strongly interact with the gold atoms of the nanoclusters. The CeO2-supported nanoclusters show catalytic activity, based on the conversion of benzyl alcohol, in the order, [Au25-x（PET）18-xNi] 〉 [Au25-x（PET）18-xCu] 〉 [Au25-x（PET）18-xZn] 〉 [Au25-x（PET）18-xCo]. Regarding product selectivity, the [Au25-xPET）18-xZn] and [Au25-x（PET）18-xCo] catalysts preferably yield benzaldehyde, [Au25-x（PET）18-xCu] yields benzaldehyde and benzyl acid, and [Au25-x（PET）18-xNi] yields benzyl acid. The exposed metal atoms are considered as the catalytic active sites. Also, the catalytic performance （including activity and selectivity） of the [Au25-x（PET）18-xM] catalysts is greatly turned and mediated by the transition metal type.

关键词： gold nanoclusters heteroatom dopant transition metal oxidation alcohol

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Fibroblast Adhesion and Proliferation on a New β Type Ti-39Nb-13Ta-4.6Zr Alloy for Biomedical Application

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Journal of Materials Science & Technology 2006年第2期22卷 205-210页

作者： Yongkang ZHAO Yang YAO Weixian liU Caiyun ZHENG shujun li The Second Affiliated Hospital China Medical University Shenyang 110004 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Cell attachment and spreading on Ti-based alloy surfaces is a major parameter in implant technology. Ti-39Nb-13Ta-4.6Zr alloy is a new β type Ti alloy developed for biomedical application. This alloy has low modulus and high strength, which indicates that it can be used for medical purposes such as surgical implants. To evaluate the biocompatibility and effects of the surface morphology of Ti-39Nb-13Ta-4.6Zr on the cellular behaviour, the adhesion and proliferation of rat gingival fibroblasts were studied with substrates having different surface roughness and the results were also compared with commercial pure titanium and Ti-6Al-4V. The results indicate that fibroblast shows similar adhesion and proliferation on the smooth surfaces of commercial pure titanium （Cp Ti）, Ti-39Nb-13Ta-4.6Zr, and Ti-6Al-4V, suggesting that Ti-39Nb-13Ta-4.6Zr has similar biocompatibility to Cp Ti and Ti-6Al-4V. The fibroblast adhesion and spreading was lower on rough surfaces of Cp Ti, Ti-39Nb-13Ta-4.6Zr and Ti-6Al-4V than on smooth ones. Surface roughness appeared to be a dominant factor that determines the fibroblast adhesion and proliferation.

关键词： Biomaterials Titanium alloys Fibroblast Adhesion Proliferation Surface roughness

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