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Numerical study of reactive pollutants diffusion in urban street canyons with a viaduct

Building Simulation 2022年第7期15卷 1227-1241页

作者： Tingzhen Ming cao Nie Wenyu Li Xin Kang Yongjia Wu Mengjie Zhang Chong Peng School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China School of Architectural Engineering Huonggang Normal UniversityNo.146 Xingang Second RoadHuanggang 438000China mechanical Engineering department University of CaliforniaBerkeleyCA 94720USA School of Urban Planning and Architecture Huazhong University of Science and TechnologyWuhan 430074China

In this paper,the influences of the ambient wind speed and the height and width of a viaduct in a 2.dimensional street canyon on the diffusion of reactive pollutants emitted by motor vehicles were investigated using computational fluid dynamics(CFD)*** were treated as reactive by including a NO-NO_(2.-O_(3. photochemical reaction mechanism in the *** Reynolds-averaged Navier-Stokes(RANS)k-ε turbulence model and the discrete phase model were used to simulate the airflow movement and the concentration distribution,respectively,of the reactive pollutants in the street *** indices,i.e.,the chemical reaction contribution of NO(CRC_(NO)),the chemical reaction contribution of NO_(2.(CRC_(NO_(2.)),and the O_(3. depletion rate,were used to evaluate the relative importance of the photochemical *** was found that the presence of a viaduct changed the flow field structure in the street *** CRC_(NO) and CRC_(NO_(2.)decreased from the windward side to the leeward side of the *** maximum values of the CRC_(NO) and CRC_(NO_(2.) were observed at the pollution source(x=2.5 m)due to the influence of a clockwise vortex in the street *** the height and width of the viaduct increased,concentration of the ground pollutants and the O_(3. depletion rate *** O_(3. depletion rate was much higher on the leeward side(90%)than on the windward *** pollutant concentrations after the reaction were twice as high with the viaduct as without the viaduct when the viaduct height was the same as the building *** viaduct had a significantly larger influence on the concentration of the reactive pollutants than the chemical *** O_(3. depletion rate in the canyon and the pollutant concentrations decreased as the ambient wind speed increased,whereas the CRC_(NO_(2.) increased.

关键词： street canyon viaduct reactive pollutant-photochemical reaction CFD

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Soft-rigid coupling grippers:Collaboration strategies and integrated fabrication methods

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science China(Technological sciences) 2023年第11期66卷 3051-3069页

作者： CHEN Han ZHU JiaQi cao Yu XIA ZhiSheng CHAI ZhiPing DING Han WU ZhiGang State Key Laboratory of Digital Manufacturing Equipment and technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China department of mechanical and Automation Engineering The Chinese University of Hong KongHong Kong SAR 999077China

Continuously increasing applications of robot technologies in unstructured environments put higher requirements on the robotic grippers'performance,such as interaction capability,output force range,and ***,currently,it is hard for either rigid or soft grippers to meet these requirements,as single soft or rigid structures alone are difficult to effectively overcome/alleviate their inherent defects,e.g.,low compliance of rigid structures and low output force of soft *** deal with these difficulties,soft-rigid coupling grippers,or hybrid grippers are ***,the soft-rigid coupling is a promising design that combines soft and rigid structures,in order to exploit their respective advantages,such as the strength of rigid structures and compliance of soft structures,in the same set of the gripper *** the first time,herein,this paper systematically discusses the collaboration strategies of the existing hybrid robotic grippers,by classifying them as Rigid-activesoft-passive,Rigid-passive-soft-active,and *** the same time,we introduce the integrated fabrication methods of hybrid grippers,through which the soft and rigid structures with great stiffness and property differences can be coupled together to construct a stable ***,possible performance improvements on soft-rigid coupling design for gripper systems are discussed.

关键词： grasping grippers hybrid design soft-rigid coupling soft-rigid collaboration

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Erosion–corrosion behavior of SAF3.0}7 hyper-duplex stainless steel

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1415-1426页

作者： Hong-liang Xiang Yu-rui Hu Hua-tang cao Dong Liu Xuan-pu Dong School of mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China Jinjiang science and Education Park Fuzhou UniversityJinjiang 362251China department of Advanced Production Engineering Engineering and Technology Institute GroningenUniversity of GroningenNijenborgh 49747AGThe Netherlands State Key Laboratory of Materials Processing and Die&Mould technology Huazhong University of Science and TechnologyWuhan 430074China

Polarization curves and mass losses of SAF3.0}7 hyper-duplex stainless steel under various conditions were *** damaged surfaces after erosion–corrosion tests were characterized by scanning electron *** results showed that an increase in flow velocity could enhance the electrochemical corrosion and consequently decrease the passivation properties of the *** erosion–corrosion damage of the samples increased substantially when the flow velocity exceeded the critical value of 4 m·s^-*** mass loss rate increased as the sand content increased,reaching a maximum at 7 wt%sand content,corresponding to the most severe electrochemical corrosion *** the sand content was increased further,however,the mass loss rate decreased and then tended *** mass loss was divided into incubation,sustained,and stationary periods,with a maximum mass loss rate of 12.97 g·h^-1·m^-2.after an erosion period of 2.5 *** erosion–corrosion mechanism was investigated in detail.

关键词： hyper duplex stainless steel erosion corrosion flow velocity electrochemical corrosion microstructure morphology

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Roles of mechanosensitive channel Piezo 1/2.proteins in skeleton and other tissues

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Bone Research 2021年第4期9卷 456-472页

作者： Lei Qin Tailin He Sheng Chen Dazhi Yang Weihong Yi Huiling cao Guozhi Xiao department of Orthopedics Huazhong University of Science and Technology Union Shenzhen HospitalShenzhenGuangdongChina department of Biochemistry School of MedicineGuangdong Provincial Key Laboratory of Cell Microenvironment and Disease ResearchShenzhen Key Laboratory of Cell MicroenvironmentSouthern University of Science and TechnologyShenzhenGuangdongChina department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiChina

Mechanotransduction is a fundamental ability that allows living organisms to receive and respond to physical signals from both the external and internal *** mechanotransduction process requires a range of special proteins termed mechanotransducers to convert mechanical forces into biochemical signals in *** Piezo proteins are mechanically activated nonselective cation channels and the largest plasma membrane ion channels reported thus *** regulation of two family members,Piezol and Piezo2.has been reported to have essential functions in mechanosensation and transduction in different organs and ***,the predominant contributions of the Piezo family were reported to occur in the skeletal system,especially in bone development and mechano-stimulated bone *** we review current studies focused on the tissue-specific functions of Piezol and Piezo2.in various backgrounds with special highlights on their importance in regulating skeletal cell *** this review,we emphasize the diverse functions of Piezol and Piezo2.and related signaling pathways in osteoblast lineage cells and *** also summarize our current understanding of Piezo channel structures and the key findings about PIEZO gene mutations in human diseases.

关键词： mec sensation organs

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3. Printed Biomimetic Metamaterials with Graded Porosity and Tapering Topology for Improved Cell Seeding and Bone Regeneration

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Bioactive Materials 2023年第7期25卷 677-688页

作者： Lei Zhang Bingjin Wang Bo Song Yonggang Yao Seung-Kyum Choi cao Yang Yusheng Shi State Key Laboratory of Material Processing and Die&Mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China George W.Woodruff School of mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA

Biomimetic metallic biomaterials prepared for bone scaffolds have drawn more and more attention in recent ***,the topological design of scaffolds is critical to cater to multi-physical requirements for efficient cell seeding and bone regeneration,yet remains a big scientific challenge owing to the coupling of mechanical and mass-transport properties in conventional scaffolds that lead to poor control towards favorable modulus and permeability ***,inspired by the microstructure of natural sea urchin spines,biomimetic scaffolds constructed by pentamode metamaterials(PMs)with hierarchical structural tunability were additively manufactured via selective laser *** mechanical and mass-transport properties of scaffolds could be simultaneously tuned by the graded porosity(B/T ratio)and the tapering level(D/d ratio).Compared with traditional metallic biomaterials,our biomimetic PM scaffolds possess graded pore distribution,suitable strength,and significant improvements to cell seeding efficiency,permeability,and impact-tolerant capacity,and they also promote in vivo osteogenesis,indicating promising application for cell proliferation and bone regeneration using a structural innovation.

关键词： Biomimetic biomaterials Pentamode metamaterials Selective laser melting Mass-transport properties Bone scaffolds

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Improved electrical resistance-pressure strain sensitivity of carbon nanotube network/polydimethylsiloxane composite using filtration and transfer process

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Chinese science Bulletin 2010年第3期55卷 326-330页

作者： LU Qiang cao Hui SONG XiaoHui YAN Han GAN ZhiYing LIU Sheng School of mechanical science and Engineering Huazhong University of Science and Technology Wuhan 430074 China wuhan National Laboratory for Optoelectronics Wuhan 430074 China department of Electronic science and {2. Huazhong University of Science & Technology Wuhan 430074 China Research Institute of Micro/Nano science and technology Shanghai Jiaotong University Shanghai 200052 China department of Mathematics and Physics wuhan Polytechnic University Wuhan 430023China

The electrical resistance-pressure strain sensitivity of carbon nanotube network (NTN)/polymer composite is investigated. In this research, polydimethylsiloxane (PDMS) is used as the polymer matrix. The composite of NTN embedded in PDMS matrix has been fabricated by using filtration and transfer process. The thickness of NTN/PDMS composite can be controlled. Electrical re- sistance and pressure strain of the NTN/PDMS composite are measured simultaneously. Electrical resistance of NTN/PDMS composite has been obtained as a function of pressure strain. The NTN/PDMS composite exhibits linear change in electrical re- sistance as a result of pressure strain and has improved electrical resistance-pressure strain sensitivity. The NTN/PDMS composite has 90.6% resistance change at 6% pressure strain. The electrical resistance-pressure strain sensitivity of NTN/PDMS composite using filtration and transfer process is 2.13.times of the traditional NTN/PDMS composite. The characteristic in electrical resis- tance change implies that NTN/PDMS composite can be used as pressure strain sensors and applied to sensor systems.

关键词：应变灵敏度聚硅氧烷应变电阻传输过程复合使用碳纳米管加压力过滤

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Tailoring mechanical properties of PμSL 3.-printed structures via size effect

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International Journal of Extreme Manufacturing 2022年第4期4卷 261-268页

作者： Wenqiang Zhang Haitao Ye Xiaobin Feng Wenzhao Zhou Ke cao Maoyuan Li Sufeng Fan Yang Lu department of mechanical Engineering City University of Hong KongKowloonHong Kong SAR 999077People's Republic of China Nano-Manufacturing Laboratory(NML) City University of Hong Kong Shenzhen Research InstituteShenzhen 518057People's Republic of China department of mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People's Republic of China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan 430070People's Republic of China School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071People's Republic of China State Key Laboratory of Materials Processing and Die&Mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001People's Republic of China

Projection micro stereolithography(PμSL)has emerged as a powerful three-dimensional(3.)printing technique for manufacturing polymer structures with micron-scale high resolution at high printing speed,which enables the production of customized 3. microlattices with feature sizes down to several ***,the mechanical properties of as-printed polymers were not systemically studied at the relevant length scales,especially when the feature sizes step into micron/sub-micron level,limiting its reliable performance prediction in micro/nanolattice and other metamaterial *** this work,we demonstrate that PμSL-printed microfibers could become stronger and significantly more ductile with reduced size ranging from 2.μm to 60μm,showing an obvious size-dependent mechanical behavior,in which the size decreases to 2.μm with a fracture strain up to~100%and fracture strength up to~100 *** size effect enables the tailoring of the material strength and stiffness of PμSL-printed microlattices over a broad range,allowing to fabricate the microlattice metamaterials with desired/tunable mechanical properties for various structural and functional applications.

关键词： 3. printing projection micro-stereolithography(PμSL) size effect microfiber mechanical properties microlattice metamaterial

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再造·流动·情感·趣缘——数字藏品的文化传播、情感体验及数字交往

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台州学院学报 2023年第4期45卷 74-79,83页

作者：张琪云曹淮武汉大学新闻与传播学院湖北武汉430072 华中科技大学机械科学与工程学院湖北武汉430074

在虚拟现实技术支撑的多元数字空间,数字藏品成为中华优秀传统文化创造性转化与创新性发展的数字化新形式。从文化传播视角出发,运用文本分析和语义网络分析相结合的方法,对知乎关于数字藏品相关评论文本进行研究发现,在多元文化聚集的... 详细信息

在虚拟现实技术支撑的多元数字空间,数字藏品成为中华优秀传统文化创造性转化与创新性发展的数字化新形式。从文化传播视角出发,运用文本分析和语义网络分析相结合的方法,对知乎关于数字藏品相关评论文本进行研究发现,在多元文化聚集的共享平台与市场中,文化内容的再造、多样的传播形式、情感互动体验与连接、趣缘群体的形成,使文化再一次被数字藏品的形式赋能赋值。多元会话互动、情感互动体验空间、虚拟共同体的建立、流动的情感共同体是新媒体时代数字藏品趣缘群体的构筑路径,这展现了从“人—物”“人—人”关系到独特“人—物—人”平台化的数字交往关系。

关键词：数字藏品中国文化虚拟共同体情感共同体趣缘群体数字交往

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汽车车身基本气动造型的提取方法

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机械设计 2021年第11期38卷 115-120页

作者：龙韧朱文强李珺曹淮华中科技大学机械科学与工程学院湖北武汉430074 湖北工业大学工业设计学院湖北武汉430070

针对传统汽车车身气动性分析过程中非气动性部件和复杂曲面导致改进分析效率低、不利于发现整体气动性缺陷等问题,提出一种在改进分析前提取基本气动造型的方法。根据网格分布、流场影响及对非气动性细节的分析,完成整车基本气动造型的... 详细信息

针对传统汽车车身气动性分析过程中非气动性部件和复杂曲面导致改进分析效率低、不利于发现整体气动性缺陷等问题,提出一种在改进分析前提取基本气动造型的方法。根据网格分布、流场影响及对非气动性细节的分析,完成整车基本气动造型的提取,提取后的整车车身简洁,且包含实车造型特征,能够更有效地进行气动性能分析。结合CFD计算流体力学仿真软件,对简化后的车型进行仿真分析,通过对气动升力系数、气动阻力系数与实车三维模型的气动性能分析结果进行对比,验证基本气动造型的可行性。该基本气动性造型提取方法提高了气动性分析和气动造型改进效率。

关键词：汽车外形设计基本气动造型数值模拟空气动力学外流场分析

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激光增材制造相变诱导型高熵合金的研究进展

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铸造技术 2024年第8期45卷 711-725页

作者：田春茂曹裕栋欧阳迪周文琰蔡超史玉升华中科技大学材料成形与模具技术全国重点实验室湖北武汉430074 香港理工大学工业及系统工程系中国香港999077 北京遥感设备研究所北京100584

高熵合金是以4种及以上元素为主元的合金,热力学上存在高熵效应,动力学上呈现迟滞扩散效应,晶体学上表现为晶格畸变效应,使用时展现出鸡尾酒效应,具有良好的力学性能和耐腐蚀性。相变诱导塑性高熵合金通过在变形过程中发生马氏体相变,... 详细信息

高熵合金是以4种及以上元素为主元的合金,热力学上存在高熵效应,动力学上呈现迟滞扩散效应,晶体学上表现为晶格畸变效应,使用时展现出鸡尾酒效应,具有良好的力学性能和耐腐蚀性。相变诱导塑性高熵合金通过在变形过程中发生马氏体相变,延迟了裂纹的产生,同时提高了金属的加工硬化率,解决了塑性-强度难题,具有极大的研究潜力和应用前景。铸造高熵合金存在偏析严重、晶粒粗大等缺陷,成形样品力学性能差。增材制造具有局部熔池快速凝固的特点,成形的高熵合金成分均匀、晶粒细小,力学性能远高于铸件。本文阐述了增材制造成形相变诱导塑性高熵合金的显微组织、力学性能、组织演变、耐蚀性等方面的研究进展,并展望了未来的研究方向。

关键词：增材制造高熵合金应力诱导相变力学性能

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