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Layered metastructure containing freely-designed local resonators for wave attenuation

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Defence Technology（防务技术） 2024年第2期32卷 23-31页

作者： Yu Li Huguang He Jiang Feng Hailong Chen Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Rocket Force University of engineering Xi'an 710025China Henan International Joint Laboratory of Dynamics of Impact and Disaster of engineering Structures Department of Civil EngineeringNanyang Institute of TechnologyNanyang 473004China Guangxi Key Laboratory of Disaster Prevention and engineering Safety and Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China research center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China

Combining periodic layered structure with three-dimensional cylindrical local resonators,a hybrid metastructure with improved wave isolation ability was designed and investigated through theoretical and numerical *** metastructure is composed of periodic rubber layers and concrete layers embedded with three-dimensional resonators,which can be freely designed with multi local resonant frequencies to attenuate vibrations at required frequencies and widen the attenuation *** metastructure can also effectively attenuate seismic *** with layered rubber-based structures,the metastructure has more excellent wave attenuation effects with greater attenuation and wider bandgap.

关键词： Layered metastructure Local resonator Wave attenuation

Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading

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Earthquake engineering and engineering Vibration 2024年第4期23卷 957-971页

作者： Cao Yongsheng Zhou Yun Takagi Jiro Jiang Ke Deng Xuesong Fang Xiaojun Earthquake engineering research&Test center Guangzhou UniversityGuangzhou 510006China School of civil engineering Guangzhou UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Earthquake engineering and Applied Technology Guangzhou 510006China Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural SafetyMinistry of EducationGuangzhou 510006China Graduate School of Urban Environmental Sciences Tokyo Metropolitan UniversityTokyo 192-0397Japan department of civil and Natural Resources engineering University of CanterburyChristchurch CT13ANNew Zealand

This study focuses on variations in the hysteretic behavior of buckling-restrained braces(BRBs)configured with or without out-of-plane eccentricity under cyclic ***-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties,energy dissipation performance,stress distribution,and high-order deformation *** experimental and numerical results showed that compared to the concentrically loaded BRBs,the stiffness,yield force,cumulated plastic ductility(CPD)coefficient,equivalent viscous damping coefficient and energy dissipation decreased,and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded *** the existence of the out-of-plane eccentricity,the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load,while the initial high-order buckling pattern changes from a first-order C-shape to a secondorder S-shape under a compressive load.

关键词： buckling-restrained brace out-of-plane eccentricity experiment numerical simulation mechanical properties

Analysis of the effect of the 2021 Semeru eruption on water vapor content and atmospheric particles using GNSS and remote sensing

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Geodesy and Geodynamics 2024年第1期15卷 33-41页

作者： Mokhamad Nur Cahyadi Arizal Bawasir Syachrul Arief Amien Widodo Meifal Rusli Deni Kusumawardani Yessi Rahmawati Ana Martina Putra Maulida Hilda Lestiana department of Geomatics engineering Institut Teknologi Sepuluh NopemberSurabaya 60111Indonesia research center of Marine and Earth Science-Technology Directorate of Research and Community ServiceInstitut Teknologi Sepuluh NopemberSurabaya 60111Indonesia Geospatial Education and Training Division Geospatial Information Agency(BIG)Cibinong 16911Indonesia department of Geophysics engineering Institut Teknologi Sepuluh NopemberSurabaya 60111Indonesia department of Mechanical engineering Andalas UniversityPadang City 25175Indonesia department of Economics Airlangga UniversitySurabaya 60286Indonesia research center for Geological Resources National Research and Innovation AgencyJakarta 10340Indonesia

Mount Semeru,an active volcano in East Java,Indonesia,erupted on December 4,2021,following extreme rainfall that caused an avalanche of hot pyroclastic flows and *** tropospheric conditions and dominant particle components in the atmosphere can be monitored using Global Navigation Satellite System(GNSS)technology and remote sensing *** signal propagation delay in Precise Point Positioning(PPP)processing can be used to determine Zenith Tropospheric Delay(ZTD)and Precipitable Water Vapor(PWV)variables so that atmospheric conditions can be *** addition,by using remote sensing satellite data,it is possible to obtain rainfall data with high temporal resolution as well as the dominant particle and gas content values during *** the eruption period,the high value of PWV was dominated by the high intensity of precipitation during the rainy *** rainfall before the eruption caused activity inside the mountain to increase,which occurred in avalanche type *** from that,the atmosphere around Semeru was also dominated by SO_(2)content,which spreaded for tens of ***_(2)content began to be detected significantly by remote sensing sensors on December 7,*** this study,deformation and atmospheric monitoring were also carried out using low-cost GNSS at the Semeru Monitoring Station on September 9-15,*** results of the ZTD and ZWD values show the dominance of the wet component,which is directly proportional to rainfall activity in this period.

关键词： Semeru GNSS Water vapor Rainfall SO_(2)

Underestimated Methane Emissions from Solid Waste Disposal Sites Reveal Missed Greenhouse Gas mitigation Opportunities

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engineering 2024年第5期36卷 12-15页

作者： Yao Wang Chuanbin Zhou Ziyang Lou Houhu Zhang Abid Hussain Liangtong Zhan Ke Yin Mingliang Fang Xunchang Fei School of civil and Environmental engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China department of Environmental Science and engineering Shanghai Jiao Tong UniversityShanghai 200240China Nanjing Institute of Environmental Sciences Ministry of Ecology and EnvironmentNanjing 210042China department of civil and Environmental engineering Carleton UniversityOttawaON K1S 5B6Canada Ministry of Education(MOE)Key Laboratory of Soft Soils and Geoenvironmental engineering Zhejiang UniversityHangzhou 310058China department of Environmental engineering School of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China department of Environmental Science and engineering Fudan UniversityShanghai 200433China

*** Cities are responsible for approximately 70%of all anthropogenic greenhouse gas(GHG)emissions and about 60%of all anthropogenic methane(CH4)emissions[1,2].Solid waste disposal sites(including landfills and dumpsites),which are prevalent in global cities,emit CH4 generated from the anaerobic biodegradation of municipal solid waste(MSW).Notably,the proportions of CH4 emissions from disposal sites surpass 50%of the total CH4 emissions in some megalopolises[3].CH4 has a high global warming potential(GWP),being 28 times stronger than carbon dioxide(CO_(2))over a 100-year period and 80 times stronger over a 20-year period[4].Understanding and mitigating CH4 emissions from solid waste disposal sites is particularly pertinent and pressing,considering that the latest Synthesis Report from the Intergovernmental Panel on Climate Change(IPCC)emphasizes that the current pace of mitigation and adaptation policies and measures falls short of restraining global temperature rise to under 1.5℃ within the 21st century[4].More than 150 countries signed the Global Methane Pledge at the United Nations Climate Change Conference in Glasgow(COP26),which aims to reduce global annual CH4 emissions by 30%by 2030,compared with emissions in 2020[5].

关键词： landfill Solid restrain

Emergency of per-and polyfluoroalkyl substances in drinking water:Status,regulation,and mitigation strategies in developing countries

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Eco-Environment & Health 2024年第3期3卷 355-368页

作者： Adewale Adewuyi Qilin Li department of Chemical Sciences Faculty of Natural SciencesRedeemer's UniversityEdeOsun StateNigeria department of civil and Environmental engineering Rice UniversityHoustonTX 77005USA NSF Nanosystems engineering research center for Nanotechnology-Enabled Water Treatment Rice UniversityHoustonTX 77005USA department of Materials Science and Nano engineering Rice UniversityHoustonTX 77005USA department of Chemical and Biomolecular engineering Rice UniversityHoustonTX 77005USA

The detection of per-and polyfluoroalkyl substances(PFAS)in water presents a significant challenge for developing countries,requiring urgent *** review focuses on understanding the emergence of PFAS in drinking water,health concerns,and removal strategies for PFAS in water systems in developing *** review indicates the need for more studies to be conducted in many developing nations due to limited information on the environmental status and fate of *** health consequences of PFAS in water are enormous and cannot be *** are ongoing to legislate a national standard for PFAS in drinking ***,there are few known mitigation efforts from African countries,in contrast to several developing nations in ***,there is an urgent need to develop economically viable techniques that could be integrated into largescale operations to remove PFAS from water systems in the ***,despite the success achieved with removing long-chain PFAS from water,more studies are required on strategies for eliminating short-chain moieties in water.

关键词： Emerging water contaminant Per-and polyfluoroalkyl substances Perfluoroalkyl acids Photocatalysis Water pollution

利用纳米气泡控制农业废水灌溉系统复合污垢的机制

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engineering 2024年第4期35卷 214-225页

作者： Yang Xiao Bo Zhou Siyuan Tan Lei Li Tahir Muhammad Buchun Si Changjian Ma Sunny C.Jiang Yunkai Li College of Water Resources and civil engineering China Agricultural UniversityBeijing 100083China engineering research center for Agricultural Water-Saving and Water Resources(Ministry of Education of the People’s Republic of China) China Agricultural UniversityBeijing 100083China School of Environment and civil engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory of Nutrient Use and Management Institute of Agricultural Resources and EnvironmentShandong Academy of Agricultural SciencesJinan 250100China department of civil and Environmental engineering University of California-IrvineIrvineCA 92617USA

The increasing demand for wastewater treatment has become a notable trend for addressing global water ***,fouling is a significant challenge for wastewater distribution engineering *** study provides an approach using nanobubbles(NBs)to control *** antifouling capacities of three types of NBs,six oxygen concentrations,and two application procedures(prevention and removal)are *** results show that NBs effectively mitigate composite fouling—including biofouling,inorganic scaling,and particulate fouling—in comparison with the non-NBs *** specifically,hydroxyl radicals generated by the self-collapse of NBs oxidize organics and kill microorganisms in *** negatively charged surfaces of the NBs transform the crystalline form of CaCO_(3)from calcite to looser aragonite,which reduces the likelihood of ion ***,the NBs gas-liquid interfaces act as gas"bridges"between colloidal particles,enhancing the removal of particles from ***,although the NBs inhibit the growth of fouling,they do not significantly remove the already adhered fouling in non-NBs treated *** study anticipates that the application of NBs will address the significant fouling issue for various wastewater distribution engineering systems in order to meet the global challenge of sustainable water supplies.

关键词： Biofouling Scaling Colloidal fouling Wastewater Antifouling mechanism

Towards net zero carbon buildings:Accounting the building embodied carbon and life cycle-based policy design for Greater Bay Area,China

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Geoscience Frontiers 2024年第3期15卷 284-297页

作者： Hanwei Liang Xin Bian Liang Dong Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters/research center of Urban Sustainable Development/School of Geographical Sciences Nanjing University of Information Science&Technology(NUIST)Nanjing 210044China department of Architecture and civil engineering Chalmers University of TechnologySE-41296 GothenburgSweden Shenzhen research Institute(SRI) City University of Hong KongShenzhenChina department of Public and International Affairs(PIA) City University of Hong Kong999077Hong Kong Special Administrative Region School of Energy and Environment(SEE) City University of Hong Kong999077Hong Kong Special Administrative RegionChina Centre for Public Affairs and Law City University of Hong Kong999077Hong Kong Special Administrative RegionChina

Carbon mitigation of buildings is critical to promote a net-zero *** international society has vigorously promoted‘‘Net Zero Carbon Buildings”across the globe,and accounting for building carbon emissions is critical to support this *** carbon,which represents carbon emissions from the entire lifecycle of the buildings,is fundamental for realizing the idea of zero ***,only limited studies have been conducted so far that take into account the city *** paper aimed to act as a first try to account for the embodied carbon emissions in buildings in 2020 for the Guangdong-Hong Kong Macao Greater Bay Area in China(GBA).We integrated remote sensing techniques such as night-time light data(NLT)and building material flows analysis to calculate and spatialize the newly generated building material stocks(MS).Based on the MS data,we further applied life cycle assessment(LCA)to assess the embodied carbon in the *** results highlighted that over 163 million tons of embodied carbon in buildings of GBA are expected to be generated,from 497 million tons of newly generated building MS in *** embodied carbon in each life cycle stage is valuable for further lifecyclebased policy designs for:(i)supporting the updating of the green building certification system with consideration of the embodied carbon;(ii)promoting the green building material application and certification;and(iii)reducing the embodied carbon intensity from compact urban planning policy,such as the urban agglomeration policies in *** goal of this paper was to shed a light on reducing carbon emissions from the perspective of the entire lifecycle and promote the development of net zero carbon buildings in China and Asia-Pacific.

关键词： Net zero carbon building Embodied carbon Life cycle assessment Life cycle-based policies Greater Bay area

开挖补偿法防控深部地下岩爆灾害——引汉济渭工程秦岭输水隧洞案例分析

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engineering 2024年第3期34卷 154-163页

作者： Jie Hu Manchao He Hongru Li Zhigang Tao Dongqiao Liu Tai Cheng Di Peng department of Geotechnical engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory for Geomechanics and Deep Underground engineering China University of Mining and TechnologyBeijing 100083China

Rockburst disasters occur frequently during deep underground excavation,yet traditional concepts and methods can hardly meet the requirements for support under high geo-stress ***,rockburst control remains challenging in the engineering *** this study,the mechanism of excavation-induced rockburst was briefly described,and it was proposed to apply the excavation compensation method(ECM)to rockburst ***,a field test was carried out on the Qinling Water Conveyance *** following beneficial findings were obtained:Excavation leads to changes in the engineering stress state of surrounding rock and results in the generation of excess energy DE,which is the fundamental cause of *** ECM,which aims to offset the deep excavation effect and lower the risk of rockburst,is an active support strategy based on high pre-stress *** new negative Poisson’s ratio(NPR)bolt developed has the mechanical characteristics of high strength,high toughness,and impact resistance,serving as the material basis for the *** field test results reveal that the ECM and the NPR bolt succeed in controlling rockburst disasters *** research results are expected to provide guidance for rockburst support in deep underground projects such as Sichuan-Xizang Railway.

关键词： Rockburst Excavation compensation method Pre-stressed support Negative Poisson’s ratio bolt Tunnel boring machine

Ambient formaldehyde concentrations in summer in 30 Chinese cities and impacts on air cleaning of built environment

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Energy and Built Environment 2024年第4期5卷 493-499页

作者： Shuolin Qiu Zirui He Guangdong Liu Zhen Ding Zhongming Bu Jianping Cao Wenjing Ji Wei Liu Chunxiao Su Xinke Wang Fan Liu Ting Li Hua Qian Cong Liu School of Energy and Environment Southeast UniversityNanjingJiangsu210096China China Green Development Investment Group Co.LTD Beijing100000China department of Environmental Health Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsu210009China department of Energy and Environmental System engineering Zhejiang University of Science and TechnologyHangzhouZhejiang310023China School of Environmental Science and engineering Sun Yat-sen UniversityGuangzhouGuangdong510006China School of civil and Resource engineering University of Science and Technology BeijingBeijing100083China Institute for Health and Environment Chongqing University of Science and TechnologyChongqing401331China School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China School of Human Settlements and civil engineering Xi’an Jiaotong UniversityXi’an710049ShaanxiChina Tsinghua University Beijing100084China

Formaldehyde is an important carcinogen commonly found *** indoor sources have been intensively *** study on outdoor formaldehyde concentration,which is potentially an important source to indoors,remains *** study attempts to characterize temporal and spatial distribution of the atmospheric formalde-hyde concentration in Chinese *** variation of ambient formaldehyde was examined in 6 cities and peak hours were identified between 12:00 pm and 3:00 ***,outdoor formaldehyde concentrations were measured in the peak hours in 30 cities during the summer months of Jul.-Aug.,*** formaldehyde concentrations in the peak hours fell into a range of 0.005-0.087 mg/m^(3)(median value is 0.027 mg/m^(3)),87.7%of which have exceeded the chronic reference exposure criteria of 0.009 mg/m^(3) set by Office of Environmental Health hazard *** risk analysis suggests that exposure to ambient formaldehyde could cause a median carcinogenic risk of 1.9×10^(−5)(3.17×10^(−6)-6.13×10^(−5)),higher than threshold limit of 10−*** correlation analysis of the 30 cities shows that ambient summertime atmospheric formaldehyde concentrations of the city are positively correlated with its Gross Domestic Product(r=0.48).We also found that the outdoor formaldehyde concentrations in urban areas(median:0.017 mg/m^(3))is slightly higher than those in suburban areas(median:0.013 mg/m^(3)).Results here prove that outdoor formaldehyde is ubiquitous in Chinese cities and reduces effectiveness of ventilation in dilution indoor *** it would underestimate air cleaner capacity needed by a factor of about *** should be accounted for in health analysis and air quality engineering control design of built environment in the future.

关键词： Atmospheric formaldehyde Temporal distribution Health risk Ventilation efficiency