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A corrosion-resistant and age-hardenable Mg-Al-Mn-Ca-Ce dilute alloy with fine-grained structure processed by controlled rolling

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Journal of Materials Science & Technology 2023年第32期163卷 223-236页

作者： Jia-Sheng Li Mei-Xuan Li Zhen-Ming Hua Yuan-Ting Mo Kai Guan Min Zha Yipeng Gao Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012China International Center of Future Science Jilin UniversityChangchun 130012China

Low strength and poor corrosion resistance are two long-standing bottlenecks with dilute Mg ***,we report that the corrosion resistance of Mg-0.6Al-0.5Mn-0.2Ca(wt.%)alloy sheet can be significantly improved by micro-alloying with 0.3 wt.%Ce,and the strength can be considerably augmented after aging *** optimization of strength,ductility,and corrosion resistance is difficult due to the inherent trade-off in Mg ***,our aged Mg-0.6Al-0.5Mn-0.2Ca-0.3Ce alloy features with yield strength(YS)of∼194 MPa,ultimate tensile strength(UTS)of∼265 MPa,elongation to failure(EF)of∼17.2%,and corrosion rate(CR)of 2.2 mm y^(−1),the combination of which exhibits competitive advantage over other comparative dilute Mg *** is found that Ce addition decreases the activity of cathodic phases,inhibits detrimental effects of Fe impurities,and forms a protective Ce-containing surface *** high strength stems from the precipitation of ordered Guinier-Preston(G.P.)zones dispersed in uniform fine grains with an average grain size of∼8.2μ*** atomic-scale *** result in a noticeable age hardening response but do not act as crack initiation and propagation site,so our alloy also performs satisfactory *** work sheds light on the design and fabrication of strong,ductile,and corrosion-resistant dilute magnesium alloys to be used in electronic products and automotive bodies.

关键词： Magnesium alloy Micro-alloying Aging G.P.zones Mechanical property Corrosion

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Target Vehicle Selection Algorithm for Adaptive Cruise control Based on Lane-changing Intention of Preceding Vehicle

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Chinese Journal of Mechanical engineering 2021年第5期34卷 390-407页

作者： Jun Yao Guoying Chen Zhenhai Gao State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China

To improve the ride comfort and safety of a traditional adaptive cruise control(ACC)system when the preceding vehicle changes lanes,it proposes a target vehicle selection algorithm based on the prediction of the lane-changing intention for the preceding ***,the Next Generation simulation dataset is used to train a lane-changing intention prediction algorithm based on a sliding window support vector machine,and the lane-changing intention of the preceding vehicle in the current lane is identified by lateral position ***,according to the lane-changing intention and collision threat of the preceding vehicle,the target vehicle selection algorithm is studied under three different conditions:safe lane-changing,dangerous lane-changing,and lane-changing ***,the effectiveness of the proposed algorithm is verified in a co-simulation *** simulation results show that the target vehicle selection algorithm can ensure the smooth transfer of the target vehicle and effectively reduce the longitudinal acceleration fluctuation of the subject vehicle when the preceding vehicle changes lanes safely or cancels their lane change *** the case of a dangerous lane change,the target vehicle selection algorithm proposed in this paper can respond more rapidly to a dangerous lane change than the target vehicle selection method of the traditional ACC system;thus,it can effectively avoid collisions and improve the safety of the subject vehicle.

关键词： Lane-changing intention Target vehicle selection Support vector machine Adaptive cruise control

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Ultrathin origami accordion-like structure of vacancy-rich graphitized carbon nitride for enhancing CO_(2) photoreduction

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Carbon Energy 2023年第4期5卷 94-104页

作者： Guangri Jia Zhongxu Wang Ming Gong Ying Wang Lu Hua Li Yilong Dong Lulu Liu Lei Zhang Jingxiang Zhao Weitao Zheng Xiaoqiang Cui State Key Laboratory of Automotive Simulation and Control Key Laboratory of Automobile Materials of MOESchool of Materials Science and EngineeringJilin UniversityChangchunJilinChina Key Laboratory of Photonic and Electronic Bandgap Materials Ministry of EducationCollege of Chemistry and Chemical EngineeringHarbin Normal UniversityHarbinHeilongjiangChina Institute for Frontier Materials Deakin UniversityWaurn PondsVictoriaAustralia College of Chemistry Jilin UniversityChangchunJilinChina

Retaining the ultrathin structure of two-dimensional materials is very important for stabilizing their catalytic ***,aggregation and restacking are unavoidable,to some extent,due to the van der Waals interlayer interaction of two-dimensional ***,we address this challenge by preparing an origami accordion structure of ultrathin twodimensional graphitized carbon nitride(oa-C_(3)N_(4))with rich *** novel structured oa-C_(3)N_(4) shows exceptional photocatalytic activity for the CO_(2) reduction reaction,which is 8.1 times that of the pristine C_(3)N_(4).The unique structure not only prevents restacking but also increases light harvesting and the density of vacancy defects,which leads to modification of the electronic structure,regulation of the CO_(2) adsorption energy,and a decrease in the energy barrier of the carbon dioxide to carboxylic acid intermediate *** study provides a new avenue for the development of stable highperformance two-dimensional catalytic materials.

关键词： C_(3)N_(4) CO_(2)photoreduction molecular modification photocatalysts solar energy conversion two-dimensional materials

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Ultrahigh-energy and-power aqueous rechargeable zinc-ion microbatteries based on highly cation-compatible vanadium oxides

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Journal of Materials Science & Technology 2022年第25期120卷 159-166页

作者： Sheng-Bo Wang Qing Ran Wu-Bin Wan Hang Shi Shu-Pei Zeng Zi Wen Xing-You Lang Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of Education and School of Materials Science and EngineeringJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China

Aqueous multivalent-metal-ion intercalation chemistries hold genuine promise to develop safe and powerful microbatteries for potential use in many miniaturized ***,their development is beset by state-of-the-art electrode materials having practical capacities far below their theoretical *** we demonstrate that high compatibility between layered transition-metal oxide hosts and hydrated cation guests substantially boost their multi-electron-redox reactions to offer higher capacities and rate capability,based on typical bipolar vanadium oxides preintercalated with hydrated cations(M_(x)V_(2)O_(5)).When seamlessly integrated on Au current microcollectors with a three-dimensional bicontinuous nanoporous architecture that offers high pathways of electron transfer and ion transport,the constituent Zn_(x)V_(2)O_(5) exhibits specific capacity of as high as∼527 mAh g^(−1) at 5 mV s^(−1) and retains∼300 mAh g^(−1) at 200 mV s^(−1) in 1 M ZnSO_(4) aqueous electrolyte,outperforming the M_(x)V_(2)O_(5)(M=Li,Na,K,Mg).This allows aqueous rechargeable zinc-ion microbatteries constructed with symmetric nanoporous Zn_(x)V_(2)O_(5)/Au interdigital microelectrodes as anode and cathode to show high-density energy of∼358 mWh cm^(−3)(a value that is forty-fold higher than that of 4 V/500μAh Li thin film battery)at high levels of power delivery.

关键词： Multivalent metal ions Aqueous rechargeable batteries Microbatteries Nanoporous metals Metal/oxide composites

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A Semi-physical Method for Tire Normal Load Estimation Using Intelligent Tires under Cornering Conditions 6

A Semi-physical Method for Tire Normal Load Estimation Using...

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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Zhou, Jianfeng Xu, Nan Guo, Liangshen Wang, Zhenxu Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China College of Automotive Engineering Jilin University Changchun China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Intelligent tire is an emerging solution for tire state monitoring, promising to help meet the strict requirements of future autonomous driving for vehicle safety control. Tire normal load is a fundamental state in vehicle dynamic systems and needs to be estimated accurately. In this paper, a semi-physical method for tire normal load estimation under cornering conditions using an intelligent tire system is proposed. A triaxial accelerometer which measured the acceleration on the tire tread is used as the sensor of the developed intelligent tire system. A semi-physical model for tire normal load using tread radial deformation, lateral force, and wheel rolling speed as inputs is proposed, where the lateral force is estimated by lateral translation deformation of carcass. Through experimental verification, it is demonstrated that the proposed method can estimate the tire normal load with satisfactory accuracy under both free rolling and cornering conditions. © 2022 IEEE.

关键词： Tires

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Optimization Design of Airless Tire Based on Re-entrant Hexagonal Cellular Structure with Negative Poisson's Ratio Characteristics

Optimization Design of Airless Tire Based on Re-entrant Hexa...

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2022中国汽车工程学会年会暨展览会

作者： Zhao Ying Wang Binlin Yin Jusan Zhou Keming Hu Boyuan Liu Xuanming Ma Fangwu College of Engineering and Technology Southwest University State Key Laboratory of Automotive Simulation and Control Jilin University

ISBN: (纸本)9789819913640

To resolve the issues of poor load-carrying performance,high-speed instability and complex structure for airless tires,the re-entrant hexagonal airless tire with negative Poisson's ratio is *** start with,thickness coefficient a,length coefficient β,angle between side unit beam and unit axis,and re-entrant angle of the two sides are regarded as design variables,the calculation model of relative density is ***,response surface models of specific energy absorption and peak collision force of unit cell are established by constructing finite element *** this basis,optimal structural parameters can be achieved by adopting genetic algorithm with the objectives of maximum specific energy absorption,minimum peak collision force,and minimum relative density,and with the constraints that length coefficient and thickness coefficient are less than 1 and unit cell is possessed with the characteristic of negative Poisson's ***,the effects of various support structural parameters on mechanical properties of airless tires are analyzed and compared with conventional hexagonal honeycomb tire of the same *** results indicate that the energy absorption and 1 modal vibration frequency of proposed airless tire increase by 10.76% and 27.84%,***,peak stress and mass decrease by 38.69% and 13.52%,respectively.

关键词： airless tire multi-objective optimization performance analysis re-entrant hexagonal cellular structure with negative Poisson’s ratio

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Ambient particle composition and toxicity in 31 major cities in China

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Fundamental Research 2024年第3期4卷 505-515页

作者： Lu Zhang Maosheng Yao State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Current assessment of air quality or control effectiveness is solely based on particulate matter(PM)mass levels,without considering their toxicity differences in terms of health ***,we collected a total of 465 automo-bile air conditioning filters from 31 major Chinese cities to study the composition and toxicity of PM at a national *** assay showed that normalized PM toxicity(NIOG)in different Chinese cities varied greatly from the highest 4.99×10^(-3)for Changsha to the lowest 7.72×10^(-4)for ***0G values were observed to have significant correlations with annual PM_(10) concentration(r=-0.416,p=0.020)and some PM components(total fungi,so.2-and calcium element).The concentrations of different elements and water-soluble ions in PM also varied by several orders of magnitude for 31 cities in *** concentrations in PM analyzed using limulus amebocyte lysate assay ranged from 2.88 EU/mg PM(Hangzhou)to 62.82 EU/mg PM(Shijiazhuang)among 31 Chinese ***,real-time qPCR revealed 10~100-fold differences in total bacterial and fungal levels among 31 Chinese *** concentrations of chemical(water soluble ions and trace elements)and bi-ological(fungi,bacteria and endotoxin)components in PM were found to be significantly correlated with some meteorological factors and gaseous pollutants such as SO_(2).Our results have demonstrated that PM toxicity from 31 major cities varied greatly up to 6.5 times difference;and components such as fungi and SO_(4)^(2-)in PM could play important roles in the observed PM *** city-specific air pollution control strategy that integrates toxicity factors should be enacted in order to maximize health and economic *** work also provides a comprehensive view on the overall PM pollution situation in China.

关键词： PM toxicity Oxidative potential Biologicals Chemical components Endotoxin

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Alteration of the health effects of bioaerosols by chemical modification in the atmosphere:A review

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Fundamental Research 2024年第3期4卷 463-470页

作者： Ailin Li Xinghua Qiu Xing Jiang Xiaodi Shi Jinming Liu Zhen Cheng Qianqian Chai Tong Zhu State Key Joint Laboratory for Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Bioaerosols are a subset of important airborne particulates that present a substantial human health hazard due to their allergenicity and *** reactions in atmospheric processes can significantly influence the health hazard presented by bioaerosols;however,few studies have summarized such alterations to bioaerosols and the mechanisms *** this paper,we systematically review the chemical modifications of bioaerosols and the impact on their health effects,mainly focusing on the exacerbation of allergic diseases such as asthma,rhinitis,and ***,nitration,and oligomerization induced by hydroxyl radicals,ozone,and nitrogen dioxide are the major chemical modifications affecting bioaerosols,all of which can aggravate allergenicity mainly through immunoglobulin E *** processes can even interact with climate change including the greenhouse effect,suggesting the importance of bioaerosols in the future implementation of carbon neutralization *** summary,the chemical modification of bioaerosols and the subsequent impact on health hazards indicate that the combined management of both chemical and biological components is required to mitigate the health hazards of particulate air pollution.

关键词： Bioaerosols Allergenicity Chemical modification Airpollution Climate change

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Applying machine-learning screening of single transition metal atoms anchored on N-dopedγ-graphyne for carbon monoxide electroreduction toward C_(1)products

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Nano Research 2023年第8期16卷 11511-11520页

作者： Dongxu Jiao Dantong Zhang Dewen Wang Jinchang Fan Xingcheng Ma Jingxiang Zhao Weitao Zheng Xiaoqiang Cui State Key Laboratory of Automotive Simulation and Control School of Materials Science and Engineeringand Key Laboratory of Automobile Materials of MOEJilin UniversityChangchun 130012China College of Chemistry and Chemical Engineering and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025China Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Carbon monoxide electroreduction(COER)has been a key part of tandem electrolysis of carbon dioxide(CO_(2)),in which searching for high catalytic performance COER electrocatalysts remains a great ***,by means of density functional theory(DFT)computations,we explored the potential of a series of transition metal atoms anchored on N-dopedγ-graphyne(TM@N-GY,TM from Ti to Au)as the COER *** found that the final product selectivity of these single-atom catalysts depended on the position of the metal atom in the periodic table,with metals in the front and middle of each periodic period exhibiting high selectivity for CH_(4),while metals in the back producing CH_(3)*** learning(ML)found that metal atomic number was intrinsic to the difference in COER performance of these single-atom catalysts(SACs).The free energy changes showed that Mn@N-GY and Ni@N-GY exhibited outstanding COER catalytic performance for producing CH_(4)and CH_(3)OH,*** results provide theoretical and experimental guidance for designing efficient COER catalysts to generate C_(1)products.

关键词： CO electroreduction single atom catalysts γ-graphyne density functional theory machine learning

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Impacts of o-cresol spill on composition and function of river sediment and soil microbial communities

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Environmental Science and Pollution Research 2024年第22期31卷 31978-31988页

作者： Chen, Xiuli Yang, Yuyin Wang, Ji Pan, Chaoyi Zhang, Zhengke Chen, Sili Xie, Shuguang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Guangzhou510655 China

o-Cresol is a toxic substance with strong irritating and corrosive effects on skin and mucous membranes. To date, information on the effects of o-cresol on microbial communities in the natural environment is very limited. In the present study, 16S rRNA sequencing and metagenomic technique were carried out to elucidate the effects of the o-cresol spill on microbial communities in river sediments and nearby soils. o-Cresol spill induced the increase in the relative abundance of phyla Planctomycetes and Gemmatimonadetes, suggesting their resilience to o-cresol-induced stress. Uncultured Gemmatimonadetes genera and the MND1 genus exhibited enrichment, while the Pseudomonas genus dominated across all samples, indicating their potential pivotal roles in adapting to the o-cresol spill. Moreover, o-cresol spill impaired the metabolic functions of microbes but triggered their defense mechanisms. Under o-cresol pressure, microbial functions related to carbon fixation were upregulated and functions associated with sulfur metabolism were downregulated. In addition, the o-cresol spill led to an increase in functional genes related to the conversion of o-cresol to 3-methylcatechol. Several genes involved in the degradation of aromatic compounds were also identified, potentially contributing to the biodegradation of o-cresol. This study provides fresh insights into the repercussions of an abrupt o-cresol spill on microbial communities in natural environments, shedding light on their adaptability, defense mechanisms, and biodegradation potential. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Sediments

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