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14th International Conference on reliability, Maintainability and Safety, ICRMS 2023

作者： Li, Ziyang Zhang, Kun Zhu, Gang Zhao, Hao Zhang, Yingjie Sun, Lixian Reliability Research and Analysis Center China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Guilin China

ISBN: (纸本)9798350329988

Beryllium bronze conductive elastic materials are widely used in aerospace electronics, and the reliability of this material is critical for aircraft equipment A batch of conductive springs suffered from fracture failure during assembly. The fractography, chemical composition, microstructure, and microhardness of the spring were investigated, and the causes of fracture and improvement measures were discussed. The fractographs of the spring show an intergranular fracture accompanied with a dimple fracture. The chemical composition of the raw material conforms to the technical requirements. The sizes of the precipitates in the failed spring were primarily 1-2 um, while the size of the precipitates in the un-failed spring were less than 0.5 um. The grain boundary of the failed spring was wider, with larger particle phases distributed at the grain boundaries. Additionally, the average hardness of the fracture spring was 394.4 HV, which exceeds the technical requirements. The hardness of the un-failed spring met the requirements. According to the results of microstructure and hardness, improper aging treatment led to material embrittlement, and the spring suffered an intergranular fracture during assembly. © 2023 IEEE.

关键词： Brinell Hardness

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A novel insight of degradation ibuprofen in aqueous by catalytic ozonation with supported catalyst:Supports effect on ozone mass transfer

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Journal of environmental sciences 2024年第11期145卷 216-231页

作者： Zizheng Huangfu Wei Ju Yunhan Jia Ruijun Ren Zhenbei Wang Chen Li Xiaomeng Shang Yujie Li Hongnan Liu YuWang Hao Zheng Fei Qi Amir Ikhlaq Jolanta Kumirska Ewa Maria Siedlecka Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Beijing Forestry University Science Co. Ltd.Beijing 100083China Institute of Environment Engineering and Research University of Engineering and TechnologyLahore 54890Pakistan Department of Environmental Analysis Faculty of ChemistryUniversity of GdanskWita Stwosza 6380-308Poland

Catalytic ozonation is an effective wastewater purification ***,the low ozone mass transfer in packed bubble columns leads to low ozone utilization efficiency(OUE),poor organic degradation performance,and high energy ***,there is an urgent need to develop efficient supported catalysts that can enhancemass transfer and ***,the reaction mechanism of the support on ozone mass transfer remains unclear,which hinders the development of catalytic ozonation *** this study,lava rocks(LR)-supported catalysts,specifically CuMn_(2)O_(4)@LR and MnO_(2)–Co_(3)O_(4)@LR,were proposed for catalytic ozonation of IBP degradation due to their superior catalytic activity,stability,and high *** of CuMn_(2)O_(4)@LR or MnO_(2)–Co_(3)O_(4)@LR increased IBP removal efficiency from 85%to 91%or 88%,and reduced energy consumption from 2.86 to 2.14 kWh/m^(3)or 2.60 kWh/m^(3),*** improvement was attributed to LRsupported catalysts enhancing mass transfer and promoting O3 decomposition to generate•OH and•O_(2)^(−),leading to IBP ***,this study investigated the effects of ozone dose,supporter sizes,and catalyst components on ozone-liquid mass *** results revealed that the size of the supporter influenced stacked porosity and consequently affected ozone mass ***-sized LR(kLa=0.172 min^(−1))exhibited better mass transfer compared to smaller-sized *** on these findings,it was concluded that both CuMn_(2)O_(4)@LR and MnO_(2)–Co_(3)O_(4)@LR are potential catalysts for catalytic ozonation in residual IBP degradation of pharmaceutical wastewater,and LR showed good credibility as a catalyst *** the effects of supporters and active components on ozone mass transfer provides a fundamental principle for designing supported catalysts in catalytic ozonation applications.

关键词： Catalytic ozonation Lava rocks Overall volumetric mass transfer coefficient Supported catalyst

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Deciphering decadal urban ozone trends from historical records since 1980

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National science Review 2024年第11期11卷 117-129页

作者： Haolin Wang Xiao Lu Paul I.Palmer Lin Zhang Keding Lu Ke Li Tatsuya Nagashima Ja-Ho Koo Hiroshi Tanimoto Haichao Wang Meng Gao Cheng He Kai Wu Shaojia Fan Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen University and Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Geo Sciences University of Edinburgh National Centre for Earth Observation University of Edinburgh Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking University State Key Joint Laboratory of Environmental Simulation and Pollution Control The State Environmental Protection Key Laboratory of Atmospheric Ozone Pollution ControlCollege of Environmental Sciences and Engineering Peking University Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science &Technology National Institute for Environmental Studies Department of Atmospheric Sciences Yonsei University Department of Geography Hong Kong Baptist University Department of Civil and Environmental Engineering University of California

Ozone pollution is a major environmental threat to human health. Timely assessment of ozone trends is crucial for informing environmental policy. Here we show that for the most recent decade（2013–2022） in the northern hemisphere, warm-season（April–September） mean daily 8-h average maximum ozone increases much faster in urban regions with top ozone levels(mainly in the North China Plain, 1.2 ± 1.3 ppbv year-1) than in other, low-ozone regions(0.2 ± 0.9 ppbv year-1). These trends widen the ozone differences across urban regions, and increase extreme pollution levels and health threats from a global perspective. Comparison of historical trends in different urban regions reveals that ozone increases in China during 2013–2022 differ in magnitude and mechanisms to historical periods in other regions since *** reflects a unique chemical environment characterized by exceptionally high nitrogen oxides and aerosol concentrations, where reducing ozone precursor emissions leads to substantial ozone *** increase in China has slowed down in 2018–2022 compared to 2013–2017, driven by ongoing emission reductions, but with ozone-favorable weather conditions. Historical ozone evolution in Japan and South Korea indicates that ozone increases should be suppressed with continuous emission *** temperature and associated wildfires have also reversed ozone decreases in the USA and Europe,with anthropogenic ozone control slowing down in recent decades.

关键词： air quality surface ozone trends

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Numerical and Experimental Study on Heat Transfer Characteristics of Single Vibrating Blade in a Channel Flow

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Journal of Thermal science 2023年第3期32卷 982-992页

作者： HU Jinqi MIN Chunhua YANG Xuguang WANG Kun XIE Liyao School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Thermal Science and Energy Clean Utilization Hebei University of TechnologyTianjin 300401China

The heat transfer characteristics of the vibrating blades of different shapes were numerically modeled in the present work.A single blade was arranged in a channel with vertical or horizontal *** the static environment and the channel flow were *** types of blades,rectangular,trapezoidal,serrated,and folding,were comparably *** results showed that the vibrating blade could effectively enhance the convection heat transfer of the heated surface with a smaller increase of pressure *** the static environment,the heat transfer performance of the vertical alignment of the blade is better than the horizontal *** channel flow,the opposite conclusion is *** the inlet velocity of channel flow v_(inlet)=2 m/s and v_(inlet)=6m/s,the maximum improvement of the local convection heat transfer coefficient is about 98%and 12%,*** corresponding pressure drops were reduced and increased by 9.5%and 8.8%,*** vibrating blade can effectively improve the convection heat transfer at lower inlet *** the same working conditions,the pressure drop difference between the four shapes of fan blades is less than 1%,and the folding blade has the best local heat dissipation performance.

关键词： convection heat transfer vibrating blade alignment of the blade shape of the blade

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Dynamics of Land Use/Land Cover Considering Ecosystem Services for a Dense-Population Watershed Based on a Hybrid Dual-Subject Agent and Cellular Automaton Modeling Approach

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engineering 2024年第6期37卷 182-195页

作者： Yutong Li Yanpeng Cai Qiang Fu Xiaodong Zhang Hang Wan Zhifeng Yang Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China School of Water Conservancy and Civil Engineering Northeast Agricultural UniversityHarbin 150030China School of Environmental Science and Engineering Shandong UniversityQingdao 266000China

Land use/land cover represents the interactive and comprehensive influences between human activities and natural conditions,leading to potential conflicts among natural and human-related issues as well as among *** study introduced economic standards for farmers.A hybrid approach(CA-ABM)of cellular automaton(CA)and an agent-based model(ABM)was developed to effectively deal with social and land-use synergic issues to examine human–environment interactions and projections of land-use conversions for a humid basin in south *** attributes and socioeconomic data were used to analyze land use/land cover and its drivers of *** major modules of the CA-ABM are initialization,migration,assets,land suitability,and land-use change *** estimates of the factors influencing the urban land-use conversion probability were captured using parameters based on a spatial logistic regression(SLR)***,multicriteria evaluation(MCE)and Markov models were introduced to obtain empirical estimates of the factors affecting the probability of ecological land *** agent-based CA-SLR-MCE-Markov(ABCSMM)land-use conversion model was proposed to explore the impacts of policies on land-use *** model can reproduce observed land-use patterns and provide links for forest transition and urban expansion to land-use decisions and ecosystem *** results demonstrated land-use simulations under multi-policy scenarios,revealing the usefulness of the model for normative research on land-use management.

关键词： Land use/land cover Human-environment interactions Agent-based model Cellular automaton

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Enhanced removal of antibiotic resistance genes during chicken manure composting after combined inoculation of Bacillus subtilis with biochar

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Journal of environmental sciences 2024年第1期135卷 274-284页

作者： Zewen Wu Luan Zhang Hao Lin Shungui Zhou Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China School of Environmental Science and Engineering Hubei Key Laboratory of Mine Environmental Pollution Control and RemediationHubei Polytechnic UniversityHuangshi 435003China Fujian Provincial Key Laboratory of Eco-Industrial Green Technology Wuyi UniversityWuyishan 354300China

This study explored the combined effects of Bacillus subtilis inoculation with biochar on the evolution of bacterial communities,antibiotic resistance genes(ARGs),and mobile genetic elements(MGEs)during the composting of chicken *** results showed that *** inoculation combined with biochar increased bacterial abundance and diversity as well as prolonged the compost thermophilic *** organic matter biodegradation and facilitated the organic waste compost humification process,reduced the proliferation of ARGs by altering the bacterial *** and Actinobacteriota were the main resistant bacteria related to ARGs and *** decrease in ARGs and MGEs was associated with the reduction in the abundance of related host *** inoculation with *** and the addition of biochar could promote nutrient transformation,reduce the increase in ARGs and MGEs,and increase the abundance of beneficial soil taxa.

关键词： Antibiotic resistance gene Bacillus subtilis Bacterial community Biochar Composting

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Optical and molecular insights into dissolved organic matter release in soils induced by downward migration of biochar colloids

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Carbon Research 2024年第1期3卷 1-13页

作者： Zhao, Kang Shang, Jianying College of Land Science and Technology China Agricultural University Key Laboratory of Arable Land Conservation in North China Ministry of Agriculture and Rural Affairs Beijing100193 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China

The frequent wildfires and extensive biochar application accumulate biochar colloids in soils. The transport of biochar colloids may influence the release of soil dissolved organic matter (DOM) due to their high mobility and active surface, posing a detrimental impact on carbon cycle, pollutants behaviors, and water quality. Here, we examined the effect of pristine and aged biochar colloids on soil DOM release in three types of soils (black soil, fluvisol, and paddy soil) through adsorption and column experiments combined with fluorescence excitation/emission matrix spectroscopy (EEM) and fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Adsorption experiment showed that biochar exhibited little effect on soil DOM release, while transport experiment indicated that the downward movement of both pristine and aged biochar colloids significantly enhanced the release of soil DOM, especially black soil and fluvisol. EEM spectra indicated that a humic acid-like substance with large molecular weights was the primary DOM that enhanced release from black soil (10.9–12.0% enhancement) and fluvisol (6–8% enhancement) during biochar colloid transport. Condensed aromatic-like (22.8% and 19.4%) and tannin-like (18.4% and 18.9%) compounds are the primary molecules correlated to the enhanced release of humic acid-like substances. Although chemical aging resulted in a more negative surface of aged biochar colloids and slightly enhanced biochar colloid transport (up to 7.0%), it showed no distinct effect on the release of soil DOM. This study indicates that biochar colloids may cause an increase in DOM release when irrigation and rainfall occur, and more attention should be paid to the environmental impacts of biochar colloids from intensive biochar application and wildfires. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Fourier transform infrared spectroscopy

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Programming Shape-Morphing Behavior of Zwitterionic Polymer/Liquid Crystal Composite with Humidity-responsive Self-healing Performance

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Chinese Journal of Polymer science 2023年第2期41卷 212-221页

作者： Shao-Jun Chen Hui-Feng Cheng Bin Du Jiao-Shi Liu Wen-Bo Shen Hai-Tao Zhuo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China Shenzhen Key Laboratory of Functional Polymer College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen518060China

In this study,a zwitterionic polymer/liquid crystals composite film with programming shape-morphing behavior and humidityresponsive self-healing performance was prepared by blending a zwitterionic polymer and liquid crystalline azobenzene compound in solution,followed by film-forming in a mold without tedious or multistep synthetic *** as-obtained zwitterionic polymer/liquid crystal composite film exhibited programming shape-morphing behavior under different *** this process,the temporary shape of the composite film was memorized after the removal of the *** characteristics would fit the requirements of intelligence and energy-saving for stimuliresponsive shape-changing ***,the composite film showed humidity-responsive self-healing performances under wet conditions at room *** summary,the simple design and preparation route of the zwitterionic polymer/liquid crystal composite film with programming shape-morphing behavior and mild condition-responsive self-healing performance look promising for the fabrication and practical application of novel photo-driven devices and soft robotics.

关键词： Zwitterionic polymer Polymer/liquid crystals composite Programming shape-morphing behavior Humidity-responsive self-healing performance Stimuli-responsive shape-changing

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Nanofiber-reinforced CoFe_(2)O_(4)/graphene composite aerogel as broadband electromagnetic wave absorber

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Nano Research 2025年第2期18卷 464-476页

作者： Shuang Xu Qinghai Liu Zhaoliang Yu Lijun Li Xiaodong Dai Shuyan Yu Congju Li School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of NBC Protection for Civilian Beijing 102205China College of Textiles Donghua UniversityShanghai 201620China

Graphene aerogel(GA)is a promising lightweight and high-performance material for electromagnetic wave absorption due to its ultra-light ***,the impedance matching and attenuation capabilities of GA are limited by its high conductivity and constrained attenuation *** address this limitation,magnetic materials are often combined with GA to enhance both impedance matching and attenuation ***,little attention has been given to the influence of magnetic materials with varying morphologies on the electromagnetic wave absorption(EMA)*** this study,CoFe_(2)O_(4) nanofibers were prepared via electrospinning technology as an alternativeto commercial CoFe_(2)0_(4) ***,CoFe_(2)O_(4)@GA composites were synthesized through a hydrothermal reaction in a graphene oxide(GO)***,the inclusion of ethylene glycol in the GO solution helped regulate the volume shrinkage of GA after the adding of CoFe_(2)O_(4),thus preventing structural instability and *** introduction of a small quantity of magnetic nanofibers significantly enhanced the EMA performance of the CoFe_(2)O_(4)@GA composite,increasing the strongest absorption from-34.5 to-53.5 dB and widening the maximum effective absorption bandwidth(EAB)from 8.0 to 8.7 ***,the study revealed that CoFe_(2)O_(4) nanofibers outperformed nanoparticles in electromagnetic wave loss mechanisms,including magnetic coupling,magnetic resonance,eddy current loss,and interface *** finding provides valuable insights for the selection and optimization of magnetic component morphologies in EMA materials.

关键词： graphene aerogel nanofiber self-assembled composite materials magnetic coupling electromagnetic absorption

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Core-shell MnCeO_(x)catalysts for NO oxidation and mild temperature diesel soot combustion

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Journal of Rare Earths 2023年第4期41卷 531-538页

作者： Xiayu Liu Yonghua Guo Qiusheng He Chan Zhang Yan Li School of Environmental Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory for Special Functional Aggregate Materials of Education Ministry School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

environmental contamination such as soot particles and NO_(x)has aroused extensive attraction ***,the main challenge lies in the oxidation of soot at mild temperature with the assistance of NO_(x).Here,a series of core-shell MnCeO_x catalysts were successfully synthesized by hydrothermal method and employed for low-temperature catalytic oxidation of soot in the presence of NO_(x).X-ray diffraction(XRD),inductively coupled plasma-optical emission spectrometry(ICP-OES),energy-dispersive X-ray spectroscopy(EDS),transmission electron microscopy(TEM),N_(2)adsorptio n/deso rption,H_(2)-tempe rature programmed reduction(H_(2)-TPR),O_(2)-temperature programmed desorption(O_(2)-TPD),X-ray photoelectron spectroscopy(XPS)and Raman analyses were conducted for identifying the structure of prepared catalysts and investigating redox properties of the core-shell mixed oxide,which shows excellent performance for NO oxidation and the T_(50)about 350℃for soot ***,soot particle is oxided at 304℃in the presence of NO,while T_(50)augments up to 340℃in the absence of *** the NO_(x)assisted elimination cases of soot,NO_(2)generated from NO in emission gas is generally reckoned as a facilitator which significantly reduces ignition temperature of soot *** catalytic mechanism over core-shell MnCeO_(x)catalysts is also proposed in this paper.

关键词： Catalytic oxidation NO oxidation Soot NO_(x)-assisted MnCeO_(x)catalysts Rare earths

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