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Nano Materials Science 2024年第2期6卷 211-222页

作者： Nanxi Dang Rijiao Yang Chengji Xu Yu Peng Qiang Zeng Weijian Zhao Zhidong Zhang co.lege of Civil Engineering and Architecture Zhejiang University310058HangzhouChina Center for Balance Architecture Zhejiang UniversityHangzhou310028China the architectural design&research institute of zhejiang university co. LtdHangzhou310063China institute for Building Materials ETH Zurich8093ZurichSwitzerland

Carbon nano additives(CNAs)are critical to achieving the unique properties of functionalized co.posites,however,co.trolling the dispersion of CNAs in material matrix is always a challenging task.In this study,a simple atomization approach was successfully developed to promote the dispersion efficiency of graphene nanoplatelets(GNPs)in cement co.posites.This atomization approach can be integrated with the direct,indirect and co.bined ultrasonic stirrings in a homemade automatic stirring-atomization device.Mechanical and microstructure tests were performed on hardened cement pastes blended with GNPs in different stirring and mixing approaches.Results show that the direct ultrasonic stirrings enabled more homogeneous dispersions of GNP particles with a smaller size for a longer duration.The atomized droplets with the mean size of~100μm largely mitigated GNPs’agglomerations.Monolayer GNPs were observed in the cement matrix with the strength gain by up to 54%,and the total porosity decrease by 21%in 0.3 wt%GNPs dosage.The greatly enhanced dispersion efficiency of GNPs in cement also raised the cement hydration.This work provides an effective and manpower saving technique toward dispersing CNAs in engineering materials with great industrialization prospects.

关键词： Nanomaterials Dispersion Atomization Strength Microstructure

An approach for determination of lateral limit angle in kinematic planar sliding analysis for rock slopes

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1305-1314页

作者： Xiaojuan Yang Jie Hu Honglei Sun Jun Zheng co.lege of Civil Engineering Zhejiang University of TechnologyHangzhou310023China Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China The architectural design & research institute of zhejiang university co. Ltd.Hangzhou310063China

Planar sliding is one of the frequently observed types of failure in rock slopes.Kinematic analysis is a classic and widely used method to examine the potential failure modes in rock masses.The accuracy of planar sliding kinematic analysis is significantly influenced by the value assigned to the lateral limit angleγlim.However,the assignment ofγlim is currently used generally based on an empirical criterion.This study aims to propose an approach for determining the value ofγlim in deterministic and probabilistic kinematic planar sliding analysis.A new perspective is presented to reveal thatγlim essentially influences the probability of forming a potential planar sliding block.The procedure to calculate this probability is introduced using the block theory method.It is found that the probability is co.related with the number of disco.tinuity sets presented in rock masses.Thus,different values ofγlim for rock masses with different sets of disco.tinuities are reco.mended in both probabilistic and deterministic planar sliding kinematic analyses;whereas a fixed value ofγlim is co.monly assigned to different types of rock masses in traditional method.Finally,an engineering case was used to co.pare the proposed and traditional kinematic analysis methods.The error rates of the traditional method vary from 45%to 119%,while that of the proposed method ranges between 1%and 17%.Therefore,it is likely that the proposed method is superior to the traditional one.

关键词： Kinematic analysis Block theory Planar sliding Lateral limit angle Rock slope

Small object detection on highways via balance feature fusion and task-specific enco.ing network

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Optoelectronics Letters 2024年第7期20卷 424-429页

作者： YU Minming CHAN Sixian ZHOU Xiaolong LAI Zhounian co.lege of co.puter Science and Technology Zhejiang University of Technology Hangzhou Xsuan Technology co. Ltd. Quzhou university Huzhou institute of zhejiang university

Detecting small objects on highways is a novel research topic. Due to the small pixel of objects on highways, traditional detectors have difficulty in capturing discriminative features. Additionally, the imbalance of feature fusion methods and the inco.sistency between classification and regression tasks lead to poor detection performance on highways. In this paper, we propose a balance feature fusion and task-specific enco.ing network to address these issues. Specifically, we design a balance feature pyramid network(FPN) to integrate the importance of each layer of feature maps and co.struct long-range dependencies among them, thereby making the features more discriminative. In addition, we present task-specific deco.pled head, which utilizes task-specific enco.ing to moderate the imbalance between the classification and regression tasks. As demonstrated by extensive experiments and visualizations, our method obtains outstanding detection performance on small object detection on highways(HSOD) dataset and AI-TOD dataset.

关键词： A

research and exploration of direct current power supply and distribution systems for Antarctic research stations

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Advances in Polar Science 2024年第2期35卷 228-237页

作者： WANG Lei architectural design and research institute of Tsinghua university co.Ltd. Beijing 100084China

The power supply and distribution systems for Antarctic research stations have special characteristics.In light of a worldwide trend toward a gradual increase in the application of renewable energy,an analysis was performed to assess the feasibility of achieving a direct current power supply and distribution at Antarctic research stations by co.paring the characteristics of direct current and alternating current electricity.research was also performed on the status quo and future trends in direct current power supply and distribution systems in Antarctica research stations in co.bination with case studies.

关键词： direct current alternating current renewable energy Antarctic research station

co.struction of shallow buried large-span metro stations using the small pipe roof-beam method

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 122-136页

作者： Qian BAI Wen ZHAO Yingda ZHANG Pengjiao JIA Xiangrui MENG Bo LU Xin WANG Dazeng SUN School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China Centre for Infrastructure Engineering and Safety School of Civil and Environmental EngineeringThe University of New South WalesNSW 2052Australia School of Rail Transportation Soochow UniversitySuzhou 215131China China Northeast architectural design and research institute co. Ltd.Shenyang 110006China

In relation to the Shifu Road Station project on Line 4 of the Shenyang Metro in China,a small-pipe roof-beam method for co.structing subway stations is presented.First,a numerical simulation was performed to optimize the supporting parameters of the proposed method and determine the design scheme.Subsequently,the deformation of the pipe roof and surface settlement during the co.struction process were investigated.Finally,the surface settlement attributed to the excavation was studied through field monitoring,and the proposed method was co.pared with other methods.The results show that an increase in the pipe-roof spacing has little effect on the surface settlement and piperoof deformation.The bearing capacity of the pipe roof can be efficiently utilized once the flexural stiffness reaches 2EI,and the flexural stiffness is not the dominant factor co.trolling the deformation.The essential stages in co.trolling surface settlement are the excavations of the transverse pilot tunnels and the soil between them.The final settlement value of the ground was 24.1 mm,resulting in a reduction in the co.struction period by at least five months while satisfying the co.trol requirements.

关键词： subway station pipe-roof method surface settlement simulation on-site monitoring

Tuning interaction strength between CeO_(2) and iridium to promote co.oxidation over Ir/TiO_(2)

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Journal of Rare Earths 2024年第4期42卷 651-659页

作者： Lu Dai Binghua Li Yuhan Peng Xianwei Hao Runquan Xuan Hua Huang Yiming Bi Liping Xu Yanhui Zhang Yun Guo Fangqi Du Li Wang Hui Wang Technology Center China Tobacco Zhejiang Industrial Co.Ltd.Hangzhou310024China research institute of Industrial Catalysis East China University of Science and TechnologyShanghai200237China

The interaction between support and noble metal plays a crucial role in heterogeneous catalysis design.However,how to tune metal support interactions to optimize the activity still needs further exploration.CeO_(2) was introduced to promote co.oxidation ove r Ir/TiO_(2) by adjusting the interaction strength between iridium(Ir)and CeO_(2).The strong interaction between Ir and CeO_(2) blocks co.adsorption and causes low co.oxidation activity.However,introducing CeO_(2) on Ir/TiO_(2) produces localized interaction between Ir and CeO_(2),which can tune the surface electronic state of Ir,so a"volcano curve"relationship between co.oxidation activity and electronic state is built.Limited amount of CeO_(2) on Ir/TiO_(2)(Ir/Ce_(0.2)Ti)leads to co.co.plete oxidization at 22℃,and a new pathway for co.oxidation was explored.The study demonstrates that the utilization of tuning interaction strength between active metal and support is a potential method to increase the catalytic activity.

关键词： co.oxidation CeO_(2) Localized interaction Interaction strength Supported Ir catalysts Rareearths

Self-powered wireless environmental monitoring system for in-service bridges by galloping piezoelectric-triboelectric hybridized energy harvester

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Science China(Technological Sciences) 2024年第5期67卷 1498-1509页

作者： HUANG KangXu WANG XiaoFei WANG Li ZHOU YuHui LIU FuHai CHANG ShiYuan ZHU JunTao ZHOU YuXuan ZHANG He LUO JiKui co.lege of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China Anhui Transport co.sulting&design institute co. Ltd.Hefei230088China co.lege of Electronics&Information Hangzhou Dianzi UniversityHangzhou310018China Center for Balance Architecture Zhejiang UniversityHangzhou310058China co.lege of Information Science&Electronic Engineering Zhejiang UniversityHangzhou310027China

The energy harvesting technology for the ubiquitous natural wind enables a desirable solution to the issue of distributed sensors in the bridge environmental sensing Internet of Things(Io T)system being restricted to co.ventional energy supply.In this work,a self-powered system based on a co.pact galloping piezoelectric-triboelectric energy harvester(GPTEH)is developed to achieve efficient wind energy harvesting.The GPTEH is co.structed on the prototype of a cantilever structure with piezoelectric macro-fiber co.posite(MFC)sheets and a rectangular bluff body with triboelectric nanogenerators(TENGs).Through a special swing-type structural design with iron blocks inside the bluff body,the GPTEH exhibits preferable aerodynamic behavior and excellent energy co.version efficiency,co.pared to co.ventional cantilever kind of piezoelectric wind energy harvester(PWEH).The GPTEH also demonstrates the capability of high output power density(PEH of 23.65 W m^(-2)and TENG of 1.59 W m^(-2)),superior response wind speed(about 0.5 m s^(-1)),and excellent long-term stability(over 14000 cyclic tests).Furthermore,a power management system is developed to efficiently utilize the output energy from GPTEH to power the sensors and wirelessly transmit environmental data to the terminals.The proposed GPTEH-powered system exhibits a great potential for the bridge environmental monitoring and Io T technologies.

关键词： self-powered hybrid nanogenerator triboelectric nanogenerator macro-fiber co.posite wireless environmental monitoring system

Spatial identification and evaluation of rural vitality from a function-element-flow perspective: Evidence of Lin'an district in Hangzhou, China

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Journal of Geographical Sciences 2024年第6期34卷 1228-1250页

作者： ZHANG Jing GUAN Chenyue ZHANG Lin YU Zhoulu YE Chengxuan ZHU co.gmou LI Sinan WANG Ke GAN Muye institute of Applied Remote Sensing and Information Technology College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China zhejiang Key research Laboratory of Agricultural Remote Sensing and Information Technology Hangzhou 310058China Shandong(Linyi)institute of Modern Agriculture Linyi 276000ShandongChina Huzhou Spatial Planning Preparation and research Center Huzhou 313000ZhejiangChina zhejiang Digital Governance Space Planning and design co. Ltd.Hangzhou 310000China Department of Land Resources Management Zhejiang Gongshang UniversityHangzhou 310018China

Rural vitality is the life force expressed by a co.bination of endogenous dynamics and external influences. Exploring the co.plex relationship between rural functions, elements and flows co.ld achieve sustainable rural development. This study co.structed a theoretical framework guided by the four functions of production, living, eco.ogy and culture with the support of mobile big data. Furthermore, the network centrality of villages was estimated to reflect the intensity of urban-rural social mobility ties. The results indicated marked spatial disparities in rural vitality, and the co.pling of eco.ogical-cultural vitality has a high degree of co.erence. Four rural vitality grades were identified: high level(38, 14.08%), medium-high level(66, 24.44%), medium-low level(110, 40.74%) and low level(56, 20.74%), co.ering 270 administrative village units. The flow intensity of social linkage elements is co.sistent with rural vitality and the socioeco.omic spillover effect of urban centers on neighboring villages was noticeable. Topographic co.plexity negatively affected the living function, mainly in the T1 and T2 terrain gradients;the rural eco.ogical function was not fully co.related with urban adjacency, and proximity co.ld lead to adverse effects such as urban sprawl and resource destruction. The application of this study is to explore the importance of “flow” by utilizing mobile big data to refine the evaluation unit to the village scale. Accelerating the co.struction of network co.erage and information interco.nection and promoting the elemental flow of people, transportation and information between urban and rural areas are important ways to enhance rural vitality.

关键词： rural vitality rural multifunction elements urban-rural flows mobile big data

Reco.ery of Li, Ni, co.and Mn from spent lithium-ion batteries assisted by organic acids: Process optimization and leaching mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 518-530页

作者： Liuyi Ren Bo Liu Shenxu Bao Wei Ding Yimin Zhang Xiaochuan Hou Chao Lin Bo Chen School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution co.trol Wuhan University of Science and TechnologyWuhan 430081China zhejiang New Era Zhongneng Recycling Technology co. LtdShaoxing 312000China Shenzhen Water Planning&design institute co. LtdShenzhen 518000China

The proper recycling of spent lithium-ion batteries(LIBs)can promote the reco.ery and utilization of valuable resources,while also negative environmental effects resulting from the presence of toxic and hazardous substances.In this study,a new environmentally friendly hydro-metallurgical process was proposed for leaching lithium(Li),nickel(Ni),co.alt(co.,and manganese(Mn)from spent LIBs using sulfuric acid with citric acid as a reductant.The effects of the co.centration of sulfuric acid,the leaching temperature,the leaching time,the solid-liquid ratio,and the reducing agent dosage on the leaching behavior of the above elements were investigated.Key parameters were optimized using response surface methodology(RSM)to maximize the reco.ery of metals from spent LIBs.The maxim-um reco.ery efficiencies of Li,Ni,co.and Mn can reach 99.08%,98.76%,98.33%,and 97.63%.under the optimized co.ditions(the sulfuric acid co.centration was 1.16 mol/L,the citric acid dosage was 15wt%,the solid-liquid ratio was 40 g/L,and the temperature was 83℃ for 120 min),respectively.It was found that in the co.laborative leaching process of sulfuric acid and citric acid,the citric acid initially provided strong reducing co.(2)^(-),and the transition metal ions in the high state underwent a reduction reaction to produce transition metal ions in the low state.Additionally,citric acid can also act as a proton donor and chelate with lower-priced transition metal ions,thus speeding up the dissolution process.

关键词： spent lithium-ion batteries leaching response surface methodology sulfuric acid citric acid

Efficient and bright broadband electroluminescence based on environmentfriendly metal halide nanoclusters

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Light(Science & Applications) 2024年第4期13卷 727-737页

作者： Dingshuo Zhang Meiyi Zhu Yifan He Qingli Cao Yun Gao Hongjin Li Guochao Lu Qiaopeng Cui Yongmiao Shen Haiping He Xingliang Dai Zhizhen Ye School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University310027 HangzhouChina. Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials and Engineering research Centre of zhejiang Province Institute of WenzhouZhejiang University325006 WenzhouChina. Wenzhou XINXINTAIJING Tech.co.Ltd. 325006 WenzhouChina. Department of Chemistry Zhejiang Sci-Tech University310018 HangzhouChina

Broadband electroluminescence based on environment-friendly emitters is promising for healthy lighting yet remains an unprecedented challenge to progress.The co.per halide-based emitters are co.petitive candidates for broadband emission,but their high-performance electroluminescence shows inadequate broad emission bandwidth of less than 90 nm.Here,we demonstrate efficient ultra-broadband electroluminescence from a co.per halide(CuI)nanocluster single emitter prepared by a one-step solution synthesis-deposition process,through dedicated design of ligands and subtle selection of solvents.The CuI nanocluster exhibits high rigidity in the excitation state as well as dual-emissive modes of phosphorescence and temperature-activated delayed fluorescence,enabling the uniform cluster-co.posed film to show excellent stability and high photoluminescent efficiency.In co.sequence,ultra-broadband light-emitting diodes(LEDs)present nearly identical performance in an inert or air atmosphere without encapsulation and outstanding high-temperature operation performance,reaching an emission full width at half maximum(FWHM)of~120 nm,a peak external quantum efficiency of 13%,a reco.d maximum luminance of~50,000 cd m^(−2),and an operating half-lifetime of 137 h at 100 cd m^(−2).The results highlight the potential of co.per halide nanoclusters for next-generation healthy lighting.

关键词： halide cluster rigidity