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Using CONTAM to design ventilation strategy of negative pressure isolation ward considering different height of door gaps

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Energy and Built Environment 2024年第1期5卷 32-45页

作者： Mingyao ma Changsheng Cao Yukun Xu Zhijian Liu Lingjie Zeng Chengquan Zhang Jun Gao School of mechanical engineering Tongji UniversityShanghai 200092China department of Power engineering North China Electric Power UniversityBaodingHebei 071003China College of Civil engineering Tongji UniversityShanghai 200092China

Infectious disease departments in hospitals require pressure gradient to create unidirectional airflow to prevent the spread of contaminants,typically by creating active air infiltration through the difference between supply and exhaust air *** door gap is the channel of air flow between rooms,so its height has an important influence on the pressure difference and infiltration air volume of the *** is still a lack of research on setting reasonable ventilation strategies according to the different heights of door gaps at different positions in the *** this study,model of a set of isolation wards was established and analyzed using the multi-zone simulation software CONTAM,and the ventilation strategies with different heights of door gaps were applied to the actual infection diseases *** results show that in a building with ventilation system divided by functional area,the difference in the height of the door gaps requires different active infiltration air *** fluctuations in the medical and patient corridors are greater than in other *** significance of this study is to understand the active infiltration of air to guide the design and operation of ventilation systems in infectious disease hospitals or building remodeled to isolate close contacts of COVID-19 *** is also instructive for the design of pressure gradients in clean workshops,biological laboratories,and other similar buildings.

关键词： Door gap height Active infiltration Pressure gradient Multizone model CONTAM Control strategy

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Modeling and Simulation of Heat Transfer in Loaded Continuous Heat Treatment Furnace

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材料热处理学报 2004年第5B期25卷 764-768页

作者： KANGJin-wu HUANGTian-you PURUSHOTHAmaNRadhakrishnan departmentofmechanicalengineering TsinghuaUniversityBeijingChina CHTE WorcesterPolytechnicInstituteWorcesterMA01609USA

Continuous furnaces are widely used in the heat treatment of mass-produced parts. However, the heating up process of parts in continuous furnace is still decided by experience. In this paper the heat transfer in the continuous furnace is formulated firstly. The heat balance in each zone is discussed and equations are given. Coupled with the model for heat transfer between workpieces and furnace and the heat transfer in the workload as well presented in the former developed CHT-6/ for batch furnaces, a program CHT- for continuous furnaces was developed. The model deals with two typical movements of parts: continuous or step by step. The moving speed of parts and load pattern can be optimized based on the calculated temperature distributions and curves, especially, the fastest heated and slowest-heated temperature-distance profiles. A case study is carried out for the heat treatment of a kind of hook-shaped part. The calculated results are analyzed and in good agreement with the measured ones.

关键词：热处理传热连续加热炉建模热平衡

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Customized heat treatment process enabled excellent mechanical properties in wire arc additively manufactured Mg-RE-Zn-Zr alloys

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International Journal of Extreme manufacturing 2024年第4期6卷 276-289页

作者： Dong ma Chunjie Xu Shang Sui Yuanshen Qi Can Guo Zhongming Zhang Jun Tian Fanhong Zeng Sergei Remennik Dan Shechtman School of materials Science and engineering Xi'an University of TechnologyXi'anShaanxi 710048People's Republic of China Xi'an Shechtman Nobel Prize New materials Institute Xi'an 710048People's Republic of China Xi'an Key Laboratory of Advanced magnesium Alloy Additive manufacturing and Precision Forming Xi'anShaanxi 710048People's Republic of China department of materials Science and engineering and Guangdong Provincial Key Laboratory of materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyShantou 515063People's Republic of China MGM Nobel Prize New materials Co. LtdTongchuan 727100People's Republic of China department of materials Science and engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials,especially for alloys with complex phase constituents and heterogenous ***,the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment ***,we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys,and a wire arc additively manufactured(WAAM)Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility *** this method,the optimal microstructures(fine grain,controllable amount of long period stacking ordered(LPSO)structure and nano-scaleβ'precipitates)and the corresponding customized heat treatment processes(520°C/30 min+200°C/4. h)were obtained to achieve a good combination of a high strength of 364.MPa and a considerable elongation of 6.2%,which surpassed those of other state-of-the-art WAAM-processed Mg ***,we evidenced that the favorable effect of the undeformed LPSO structures on the mechanical properties was emphasized only when the nano-scaleβ'precipitates were *** is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment processes for additively manufactured materials.

关键词： wire arc additive manufacturing heat treatment Mg-RE-Zn-Zr alloys LPSO structure mechanical properties

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Space aquatic chemistry:A roadmap for drinking water treatment in microgravity

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Environmental Science and Ecotechnology 2024年第3期19卷 26-28页

作者： Baiwen ma Yaohui Bai Chengzhi Hu Beizhen Xie Junya Zhang mathias Ulbricht Libing Zheng Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China Lehrstuhl für Technische Chemie II Universität Duisburg-EssenEssen45117Germany Institute of Environmental Biology and Life Support Technology School of Biological Science and Medical EngineeringBeihang UniversityBeijing100191China department of Water Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZLeipzig04318Germany

Rapid advancement in aerospace technology has successfully enabled long-term life and economic activities in space,particularly in Low Earth Orbit(LEO),extending up to 2000 km from the mean sea ***,the sustainance of the LEO Economy and its Environmental Control and Life Support System(ECLSS)still relies on a regular cargo supply of essential commodities(e.g.,water,food)from Earth,for which there still is a lack of adequate and sustainable *** key challenge in this context is developing water treatment technologies and standards that can perform effectively under microgravity *** this technical challenge will be a milestone in providing a scientific basis and the necessary support mechanisms for establishing permanent bases in outer space and *** identify clues towards solving this challenge,we looked back at relevant scientific research exploring novel technologies and standards for deep space exploration,also considering feedback for enhancing these technologies on *** our findings,we share our outlook for the future of drinking water treatment in *** also bring up a new concept for space aquatic chemistry,considering the closed environment of engineered systems operating in microgravity.

关键词： Microgravity Drinking water treatment Water quality Challenges Strategies

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macro electrochemical milling and its hybrid variants

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Chinese Journal of Aeronautics 2024年第8期37卷 1-35页

作者： Ningsong QU Xiaolong FANG Junzhong ZHANG Huanghai KONG Yang LIU Minglu WANG Xiaokang YUE Yuehong ma Zhihao SHEN Jiajie CHEN College of mechanical and Electrical engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of mechanical engineering Jiangsu UniversityZhenjiang 212003China School of mechanical engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of mechanical engineering Hefei University of TechnologyHefei 230009China

macro electromechanical milling has recently attracted increasing attention because numerous large thin-walled structures composed of difficult-to-cut materials are employed in the aerospace *** paper reviews recent developments in state-of-the-art macro electromechanical *** fundamental aspects of material removal mechanisms,such as the generation and breakdown behaviors of passive oxide films of typical difficult-to-cut materials,were *** methods for breaking down passive films are summarized,and simulation methods for the machining process coupling multiple physical fields are *** electrochemical milling methods,including fly mode electrochemical milling and sink electrochemical milling,are *** made to improve process performance,such as the material removal rate,surface quality,and machining accuracy,are *** addition,the main hybrid electrochemical milling methods,including electrochemical discharge milling,mechano-electrochemical milling,and electrochemical mill grinding,are also presented.

关键词： Electrochemical machining Electrochemical milling material removal rate Surface quality Electrochemical discharge milling Electrochemical millgrinding

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Enhancing efficiency and stability of organic solar cells through a simplified four-step synthesis of fully non-fused ring electron acceptor

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Journal of Energy Chemistry 2024年第6期93卷 601-608,I0015页

作者： Chenyang Han Huanhuan Gao Yanna Sun Yuanyuan Kan Zhaozhao Bi Wei ma Yani Zhang Juan Antonio Zapien Yingguo Yang Ke Gao College of New Energy Xi’an Shiyou UniversityXi’an 710065ShaanxiChina Shandong Provincial Key Laboratory for Science of material Creation and Energy Conversion Institute of Frontier ChemistrySchool of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237ShandongChina State Key Laboratory for mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina department of materials Science and engineering City University of Hong KongKowloonHong Kong 99907China School of Microelectronics Fudan UniversityShanghai 200433China

Design and synthesis of superior cost-effective non-fullerene acceptors(NFAs)are still big challenges for facilitating the commercialization of organic solar cells(OSCs),yet to be ***,two medium bandgap fully non-fused ring electron acceptors(NFREAs,medium bandgap,i,e.,1,3-1,8 eV),namely PTR-2Cl and PTR-4.l are synthesized with only four steps by using intramolecular noncovalent interaction central core,structured alkyl side chain orientation linking units and flanking with different electron-withdrawing end *** them,PTR-4.1 exhibits increased average electrostatic potential(ESP)difference with polymer donor,enhanced crystallinity and compactπ-πstacking compared with the control molecule *** a result,the PTR-4.l-based OSC achieved an impressive power conversion efficiency(PCE)of 14.72%,with a much higher open-circuit voltage(V_(OC))of 0.953 V and significantly improved fill factor(FF)of 0.758,demonstrating one of the best acceptor material in the top-performing fully NFREA-based OSCs with both high PCE and V_(OC).Notably,PTR-4.l-based cells maintain a good T_80lifetime of its initial PCE after over 936 h under a continuous thermal annealing treatment and over1300 h T_(80)lifetime without *** work provides a cost-effective design strategy for NFREAs on obtaining high V_(OC),efficient exciton dissociation,and ordered molecular packing and thus high-efficiency and stable OSCs.

关键词： Organic solar cells Fully non-fused ring acceptors End group engineering Morphology regulation High efficiency

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Repressing iron overload ameliorates central poststroke pain via the Hdac2-Kv1.2 axis in a rat model of hemorrhagic stroke

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Neural Regeneration Research 2024年第12期19卷 2708-2722页

作者： He Fang Mengjie Li Jingchen Yang Shunping ma Li Zhang Hongqi Yang Qiongyan Tang Jing Cao Weimin Yang department of Neurology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina department of Molecular Neuropathology Beijing Neurosurgical InstituteCapital Medical UniversityBeijingChina department of Nutrition The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina department of Neurology Henan Provincial People’s HospitalZhengzhouHenan ProvinceChina department of Human Anatomy School of Basic Medical SciencesZhengzhou UniversityZhengzhouHenan ProvinceChina Neuroscience Research Institute Zhengzhou University Academy of Medical SciencesZhengzhouHenan ProvinceChina

Thalamic hemorrhage can lead to the development of central post-stroke *** in histone acetylation levels,which are regulated by histone deacetylases,affect the excitability of neurons surrounding the hemorrhagic ***,the regulato ry mechanism of histone deacetylases in central post-stroke pain remains unclea ***,we show that iron overload leads to an increase in histone deacetylase 2expression in damaged ventral posterolateral nucleus *** this increase restored histone H3 acetylation in the Kcna2 promoter region of the voltage-dependent potassium(Kv)channel subunit gene in a rat model of central post-stroke pain,thereby increasing Kcna2expression and relieving central ***,in the absence of nerve injury,increasing histone deacetylase 2 expression decreased Kcna2expression,decreased Kv current,increased the excitability of neurons in the ventral posterolateral nucleus area,and led to neuropathic pain ***,treatment with the iron chelator deferiprone effectively reduced iron overload in the ventral posterolateral nucleus after intracerebral hemorrhage,reversed histone deacetylase 2 upregulation and Kv1.2 downregulation,and alleviated mechanical hypersensitivity in central post-stroke pain *** results suggest that histone deacetylase 2 upregulation and Kv1.2 downregulation,mediated by iron overload,are important factors in central post-stroke pain pathogenesis and co uld se rve as new to rgets for central poststroke pain treatment.

关键词： central post-stroke pain hemorrhagic stroke histone deacetylase iron overload voltage-gated potassium ion channel 1.2

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When LoRa meets distributed machine learning to optimize the network connectivity for green and intelligent transportation system

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Green Energy and Intelligent Transportation 2024年第3期3卷 24-41页

作者： malak Abid Ali Khan Hongbin ma Arshad Farhad Asad Mujeeb Imran Khan Mirani Muhammad Hamza National Key Lab of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of TechnologyBeijing 100081China department of Computer Science Namal UniversityPakistan department of Electrical engineering Tsinghua UniversityBeijing 100084China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China School of mechanical engineering Beijing Institute of TechnologyBeijing 100081China

LoRa technology contributes to green energy by enabling efficient,long-range communication for the Internet of Things(IoT).This paper addresses the challenges related to coverage range in outdoor monitoring systems utilizing LoRa,where the network performance is affected by the density of gateways(GWs)and end devices(EDs),as well as environmental *** mitigate interference,data throughput losses,and high-power consumption,the proposed spreading factor(SF)and hybrid(data rate|SF)models dynamically adjust the transmission *** orchestration of concurrent data modifications within the network server(NS)is crucial for uninterrupted communication between GWs and EDs,especially in monitoring electric vehicle(EV)stations to reduce traffic congestion and *** K-means and density-based spatial clustering of applications with noise(DBSCAN)algorithms optimizes ED allocation,averts data congestion,and improves the signal-tointerference noise ratio(SINR).These methods ensure seamless information reception by meticulously allocated EDs across various GW *** estimate the free-space losses(FSL),a log-distance path loss model(log-PL)is *** various bandwidths(BWs),bidirectional communications,and duty cycles(DCs)helps to prevent saturation,thus prolonging the operational lifespan of *** findings reveal a notable packet rejection rate(PRR)of 0%for the DBSCAN(hybrid model).In contrast,the K-means exhibits a PRR ranging from 5%(hybrid model)to 35.29%(SF model)for the ten GWs ***,the network saturation is reduced to 10.185%and 9.503%,respectively,highlighting an improvement in the average efficiency of slotted ALOHA(91.1%)and pure ALOHA(90.7%).These enhancements increase the lifespan of EDs to 15,4.5.27 days.

关键词： DBSCAN Green transportation Hybrid model Intelligent transportation K-means

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π-Extended giant dimeric acceptor as a third component enables highly efficient ternary organic solar cells with efficiency over 19.2%

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Journal of Energy Chemistry 2024年第8期95卷 263-270,I0006页

作者： Mengran Peng Haotian Wu Liming Wu Jianhua Chen Ruijie ma Qunping Fan Hua Tan Weiguo Zhu Hongxiang Li Junqiao Ding School of Chemical Science and Technology Yunnan UniversityKunming 650500YunnanChina department of Electrical and Electronic engineering Research Institute for Smart Energy(RISE)Guangdong-Hong Kong-Macao(GHM)Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesThe Hong Kong Polytechnic UniversityKowloonHong Kong 999077China State Key Laboratory for mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina School of materials Science and engineering Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and ApplicationsChangzhou UniversityChangzhou 213164JiangsuChina College of Polymer Science and engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Ternary strategy with a suitable third component is a successful strategy to improve the photovoltaic performance of organic solar cells(OSCs).Very recently,Y-series based giant molecule acceptors or oligomerized acceptors have emerged as promising materials for achieving highly efficient and stable binary OSCs,while application as third component for ternary OSCs is *** a novelπ-extended giant dimeric acceptor,GDF,is developed based on central Y series core fusion and rigid BDT as linker,and then incorporated into the state-of-the-art PM1:PC6 system to construct ternary *** GDF has a near planar backbone,resulting in increasedπ-conjugation,excellent crystallinity,and good electron transport *** GDF is introduced into the PM1:PC6 system,it ensues in a cascade like the lowest unoccupied molecular orbitals(LUMO)energy level alignment,a complementary absorption band with PM1 and PC6,higher and balanced hole and electron mobility,slightly smaller domain size,and a higher exciton dissociation probability for PM1:PC6:GDF(1:1.1:0.1)blend *** a consequence,the PM1:PC6:GDF(1:1.1:0.1)ternary OSC achieves a champion PCE of 19.22%,with a significantly higher open-circuit voltage and short-circuit current density,compared to 18.4.%for the PM1:PC6(1:1.2)binary *** findings show that employing aπ-extended giant dimeric acceptor as a third component significantly improves the photovoltaic performance of ternary OSCs.

关键词： Giant dimeric acceptor Third component Ternary organic solar cells

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Woven fabric triboelectric nanogenerators for human-computer interaction and physical health monitoring

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Nano Research 2024年第6期17卷 5540-5548页

作者： Yu Miao Mengjuan Zhou Jia Yi Yanyan Wang Guangjin Tian Hongxia Zhang Wenlong Huang Wenhao Wang Ronghui Wu Liyun ma College of Textile and Clothing Xinjiang UniversityUrumqi 830046China College of Textiles Donghua UniversityShanghai 201620China College of Physics Xiamen UniversityXiamen 201620China department of Bioengineering Imperial College LondonLondon SW72AZUK

Triboelectric nanogenerator(TENG)converts mechanical energy into valuable electrical energy,offering a solution for future energy *** an indispensable part of TENG,textile TENG(T-TENG)has incredible advantages in harvesting biomechanical energy and physiological signal ***,the application of T-TENG is restricted,partly because the fabric structure parameter and structure on T-TENG performance have not been fully *** study comprehensively investigates the effect of weaving structure on fabric TENGs(F-TENGs)for direct-weaving yarn TENGs and post-coating fabric *** direct-weaving F-TENGs,a single-yarn TENG(Y-TENG)with a core-sheath structure is fabricated using conductive yarn as the core layer yarn and polytetrafluoroethylene(PTFE)filaments as the sheath *** fabrics with five different sets of parameters were designed and *** post-coating F-TENGs,fabrics with weaving structures of plain,twill,satin,and reinforced twill were fabricated and coated with conductive silver ***,the twill F-TENGs have the best electrical outputs,followed by the satin F-TENGs and plain weave ***,the increase of the Y-TENG gap spacing was demonstrated to improve the electrical output ***,T-TENGs are demonstrated for human-computer interaction and self-powered real-time *** systematic work provides guidance for the future T-TENG’s design.

关键词： single-yarn triboelectric nanogenerators woven fabric triboelectric nanogenerators fabric weaving structures and parameters human-computer interaction physical health monitoring

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