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Plasma enhanced reduction method for synthesis of reduced graphene oxide fiber/Si anode with improved performance

Chinese Chemical Letters 2024年第11期35卷 505-511页

作者： Yihong Li Zhong Qiu Lei Huang Shenghui Shen Ping Liu Haomiao Zhang Feng Cao Xinping He Jun Zhang Yang Xia Xinqi Liang Chen Wang Wangjun Wan Yongqi Zhang Minghua Chen Wenkui Zhang Hui Huang Yongping Gan Xinhui Xia School of Materials Science&Engineering Zhejiang UniversityHangzhou 310027China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China School of Materials Science and&Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Engineering Technology Huzhou CollegeHuzhou 313000China Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611371China Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China Zhejiang Academy of Science and Technology for Inspection&Quarantine Hangzhou 311215China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Silicon(Si)is considered as one of the most promising anode materials for advanced lithium-ion batteries due to its high theoretical capacity,environmental friendliness,and widespread ***,great challenges such as volumetric expansion,limited ionic/electronic conductivity properties and complex manufacturing processes hinder its practical ***,a novel plasma-enhanced reduced graphene oxide fibers/Si(PrGOFs/Si)composite anode is first proposed by using wet-spinning technology followed by plasma-enhanced reduction *** PrGOFs provide large space to accommodate the volume expansion of Si nanoparticles(SiNPs)by forming a flexible 3D conductive *** to the conventional thermally reduced graphene oxide fibers/Si(TrGOFs/Si)sample,the PrGOFs/Si anodes demonstrate higher conductivity,specific surface area,and superior fabrication ***,the Pr GOFs/Si anodes exhibit a reversible capacity of 698.3 mA h/g,and maintain a specific capacity of 602.5m Ah/g at a current density of 200 m A/g after 100 cycles,superior to conventional Tr GOFs/Si *** research presents a novel strategy for the preparation of high-performance Si/carbon anodes for energy storage applications.

关键词： Li ion batteries Si anode Plasma Graphene fibers Carbon

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KOH-assisted aqueous synthesis of ZIF-67 with high-yield and its derived cobalt selenide/carbon composites for high-performance Li-ion batteries

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Chinese Journal of Chemical engineering 2023年第5期57卷 214-223页

作者： Kai Xue Yanchun Xue Jing Wang Shuya Zhang Xingmei Guo Xiangjun Zheng Fu Cao Qinghong Kong Junhao Zhang Zhong Jin School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSuzhou Tierui New Energy Technology Co.LtdSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

To solve the environmental pollution and low yield during the sythesis of zeolitic imidazolate frameworks(ZIFs)and their derived materials,a KOH-assisted aqueous strategy is proposed to synthesize cobalt zeolitic imidazolate framework(ZIF-67)polyhedrons,which are used as precursors to prepare cobalt selenide/carbon composites with different crystal phases(Co_(0.85)Se,CoSe_2).When evaluated as anode material for lithium ion batteries,Co_(0.85)Se/C composites deliver a reversible capacity of 758.7 m A·h·g^(-1)with a capacity retention rate of 90.5%at 1.0 A·g^(-1)after 500 cycles,and the superior rate capability is 620 m A·h·g^(-1)at 2.0 A·g^(-1).The addition of KOH accelerates the production of ZIF-67 crystals by boosting deprotonation of dimethylimidazole,resulting in rapid growth and structures transition from two-dimensional to three-dimensional of ZIF-67 in aqueous solution,which greatly promotes the application of MOFs in the field of energy storage and conversion.

关键词： KOH-assisted strategy Synthesis Aqueous solution Nanostructure Lithium-ion batteries Long cycle performance

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Landslide Damming Threats Along the Jinsha River,China

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engineering 2024年第11期42卷 326-339页

作者： Shihao Xiao Limin Zhang Te Xiao Ruochen Jiang Dalei Peng Wenjun Lu Xin He Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China The Hong Kong University of Science and Technology Shenzhen–Hong Kong Collaborative Innovation Research Institute Shenzhen 518000China State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection Chengdu University of TechnologyChengdu 610000China

The 2280 km long Jinsha River has been blocked at least four times in the past 30 years.A landslide dam-ming hazard chain can endanger communities and infrastructures hundreds of kilometers downstream from the damming site in alpine *** damming events have resulted in severe consequences,demanding a thorough assessment of damming threats along the entire Jinsha *** study digitizes the Jinsha River and visualizes its topographic,tectonic,hydrologic,and climate characteristics in detail.A two-stage full-probability method is proposed for assessing the damming threats along this river,mak-ing it possible to identify potential damming hotspots and high-priority zones for hazard *** is found that the upper reach of the Jinsha River poses the greatest damming threat,and the threat level gradually decreases *** 33.4%,36.7%,20.5%,and 9.4%of the entire length of the Jinsha River are classified as low,moderate,high,and very high threat levels,*** with existing hydropower projects,future projects in the upper reach are more likely to be exposed to landslide *** highlight the value of basin-scale spatial threat analysis and envisage that our findings will promote more targeted local-scale risk assessments for potential damming *** outcomes provide the basis for managing the risks of river damming and hydropower infras-tructure along the Jinsha River.

关键词： Landslide dam Landslides Jinsha River Risk analysis Hydropower

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Synthesis ofδ-MnO_(2)via ozonation routine for low temperature formaldehyde removal

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Journal of environmental sciences 2025年第1期147卷 642-651页

作者： Guijun Fan Yacong Guo Shaohua Chai Le Zhang Jian Guan Guojun Ma Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 361021China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Petrochemical Engineering&Environment Zhejiang Ocean UniversityZhoushan 316022China

Nowadays,it is still a challenge to prepared high efficiency and low cost formaldehyde(HCHO)removal catalysts in order to tackle the long-living indoor air ***,δ-MnO_(2)is successfully synthesized by a facile ozonation strategy,where Mn^(2+)is oxidized by ozone(O_(3))bubble in an alkaline *** presents one of the best catalytic properties with a low 100%conversion temperature of 85℃for 50 ppm of HCHO under a GHSV of 48,000 mL/(g·hr).As a comparison,more than 6 times far longer oxidation time is needed if O3 is replaced by O_(2).Characterizations show that ozonation process generates a different intermediate of tetragonalβ-HMnO_(2),which would favor the quick transformation into the final productδ-MnO_(2),as compared with the relatively more thermodynamically stable monoclinicγ-HMnO_(2)in the O_(2)***,HCHO is found to be decomposed into CO_(2)via formate,dioxymethylene and carbonate species as identified by room temperature insitu diffuse reflectance infrared fourier transform *** these results show great potency of this facile ozonation routine for the highly activeδ-MnO_(2)synthesis in order to remove the HCHO contamination.

关键词： δ-MnO_(2) Ozone oxidation HCHO oxidation In-situ DRIFTS

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Efficient and selective extraction of uranium from seawater based on a novel pulsed liquid chromatography radionuclide separation method

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Nuclear science and Techniques 2023年第2期34卷 13-27页

作者： Jian‑Hua Ye Tao Yu State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

The novel pulsed liquid chromatography radionuclide separation method presented here provides a new and promising strategy for the extraction of uranium from *** this study,a new chromatographic separation method was proposed,and a pulsed nuclide automated separation device was developed,alongside a new chromatographic *** length of this chromatographic column was 10 m,with an internal warp of 3 mm and a packing size of 1 mm,while the total separation units of the column reached 12,*** most favorable conditions for the separation of nuclides were then obtained through optimizing the separation conditions of the device:Sample pH in the column=2,sample injection flow rate=5.698 mL/min,chromatographic column heating temperature=60℃.Separation experiments were also carried out for uranium,europium,and sodium ions in mixed solutions;uranium and sodium ions in water samples from the Ganjiang River;and uranium,sodium,and magnesium ions from seawater *** separation factors between the different nuclei were then calculated based on the experimental data,and a formula for the separation level was *** experimental results showed that the separation factor in the mixed solution of uranium and europium(1:1)was 1.088,while achieving the initial separation of uranium and europium theoretically required a 47-stage *** the separation factor of 1.50for the uranium and sodium ions in water samples from the Ganjiang River,achieving the initial separation of uranium and sodium ions would have theoretically required at least a 21-stage ***,for the seawater sample separation experiments,the separation factor of uranium and sodium ions was 1.2885;therefore,more than 28 stages of sample separation would be required to achieve uranium extraction from *** novel pulsed liquid chromatography method proposed in this study was innovative in terms of uranium separation and enrichment,while expanding the possibilities

关键词： Pulsed liquid chromatography Nuclide separation Seawater uranium extraction Uranium enrichment

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Identification of high oxygen-consuming substances in stormwater drainage systems illicitly connected with sewage system

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Journal of environmental sciences 2024年第4期138卷 132-140页

作者： Chen Xu Zuxin Xu Wenhai Chu Shanshan Wu Rong Xiao Lei Su State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Laboratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China Guangzhou Resource Environmental Protection Technology Co. Ltd.Guangzhou 510030China

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment,and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological *** a water body is anoxic,the activity of anaerobic microorganisms increases and organic matter is decomposed to produce a large number of blackening and odorizing substances,resulting in black and odorous water bodies,which is a very common and typical phenomenon in ***,there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urban drainage pipe network in China,which makes oxygen-consuming substances be directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water bodies,resulting in an oxygen deficiency of the *** induces seasonal or year-round black and stink phenomena in urban ***,identifying high oxygen-consuming substances,which lays the foundation for the subsequent removal of oxygen-consuming substances,is *** a series of comparisons of water quality indicators and analysis of organic characteristics,it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study,and the oxygen-consuming substances of domestic sewage were small molecular amino *** comparing 20 conventional free amino acids,it was found that seven of them consumed oxygen easily,and compared with chemical oxygen consumption,biological oxygen consumption was in a leading position.

关键词： Urban drainage system Oxygen-consuming substances Domestic sewage Amino acid

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Assessing GNSS hydrological monitoring capability across different climatic settings in China

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Geodesy and Geodynamics 2025年第2期16卷 147-157页

作者： Qingwen Huang Lilong Liu Chaolong Yao Si Xiong Liangke Huang Tengxu Zhang College of Geomatics and Geoinformation Guilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Spatial Information and Geomatics Guilin 541004China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510640China National Precise Gravity Measurement Facility Huazhong University of Science and TechnologyWuhan 430074China School of Resources and Environment Science and Engineering Hubei University of Science and TechnologyXianning 437100China

Vertical position changes of ground-based Global Navigation Satellite System(GNsS)stations have been used to study regional terrestrial water storage(TwS)***,the feasibility is still unclear in many areas due to diverse local *** study aims to evaluate the capability of GNsS vertical displacements in monitoring hydrological variations in four climate settings over Chinese *** spatial and temporal variations of hydrological load-induced(HYDL)vertical displacements at 208 GNSS sites during 2011-2020 were analyzed by comparing with Gravity Recovery and Climate Experiment(GRACE)/GRACE Follow-On(GFO)and Global Land Data Assimilation System(GLDAS)derived TWS *** results indicate that GNsS vertical positions show different capabilities in capturing seasonal and non-seasonal hydrological dynamics in different climate *** the four climatic settings,the subtropical monsoon climate(SMC)region,with the largest deformation fluctuation(the regional mean root mean square(RMS)is 7.97 mm),has the highest regional mean HYDL-GRACE and HYDL-GLDAS anti-correlation coefficients(CCs)of-0.47 and-0.45 at the seasonal scale,*** the individual GNSS site,the number of the sites with CC<-0.4O between HYDL and GRACE/GLDASderived TWS changes accounts for 55.1%and 55.1%(SMC),13.0%and 7.4%(temperate monsoon climate,TMC),6.7%and 13.3%(temperate continental climate,TCC),32.3%and 38.7%(plateau climate,PC),*** the non-seasonal term,although the proportion with CC<-0.40 in each climate type decreases mainly due to the influence of local geodynamic and human activities,especially in the SMC and PC regions,GNSS site vertical deformations still show good capability in monitoring hydrological *** results provide valuable information for better application of GNSS to hydrology.

关键词： GNSS vertical displacement Hydrological loading GRACE GLDAS Climate setting

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Hybrid deep neural network based prediction method for unsteady flows with moving boundary

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Acta Mechanica Sinica 2021年第10期37卷 1557-1566,I0003页

作者： Ren-Kun Han Zhong Zhang Yi-Xing Wang Zi-Yang Liu Yang Zhang Gang Chen State Key Laboratory for Strength and Vibration of Mechanical Structures Shannxi Key Laboratory for Environment and Control of Flight VehicleSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an710049China Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment EngineeringBeijing100076China

Any motion, forced or free, of boundary affects the flow field around this boundary. A new kind of reduced order model (ROM) based on hybrid deep neural network is proposed to model flow field evolution process of unsteady flow around moving boundary. This hybrid deep neural network can map the relationship between the flow field at the next time step and the flow field and boundary positions at the previous time steps. Based on the learned information, the hybrid deep neural network can quickly and accurately predict the flow field. Unsteady flows around forced oscillation cylinder with various amplitudes, frequencies, and Reynolds numbers are simulated to establish the training and testing datasets. The prediction results of the hybrid deep neural network and the computational fluid dynamics (CFD) simulation results are consistent with high accuracy. The forces on the moving boundary can be integrated through the predicted flow field data. Good performance makes this new ROM method can be used in many fluid dynamics research fields, which needs fast and accurate simulation.

关键词： Deep neural network Flow fields prediction Moving boundary

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Towards verifying and improving estimations of China's CO2 and CH4 budgets using atmospheric inversions

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National science Review 2025年第4期12卷 52-67页

作者： Yilong Wang Yuzhong Zhang Xiangjun Tian Xuhui Wang Wenping Yuan Jinzhi Ding Fei Jiang Zhe Jin Weimin Ju Ruosi Liang Xiao Lu Lu Shen Shuai Sun Tao Wang Hongqin Zhang Min Zhao Shilong Piao State Key Laboratory of Tibetan Plateau Earth System Environment and Resources (TPESER)Institute of Tibetan Plateau ResearchChinese Academy of Sciences Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of Engineering Westlake University Institute of Advanced Technology Westlake Institute for Advanced Study University of Chinese Academy of Sciences Institute of Carbon Neutrality Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Frontiers Science Center for Critical Earth Material Cycling Nanjing University Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology International Institute for Earth System Science Nanjing University School of Atmospheric Sciences Sun Yat-sen University Guangdong Provincial Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Department of Atmospheric and Oceanic Sciences School of PhysicsPeking University Institute of Atmospheric Physics Chinese Academy of Sciences

This paper reviews the application of atmospheric inversions for estimating national CO2and CH4fluxes with a focus on *** describing the fundamental principles and methodologies of the technique,we synthesize recent progress in estimating China's CO2and CH4budgets through atmospheric inversion,and compare these estimates with national greenhouse gas（GHG） inventory（NGHGI） *** inverted estimates for China's total CO2and CH4emissions amount to 8.35 ± 1.39 Pg CO2a-1and 60.8 ± 5.9 Tg CH4a-1,respectively,in the last decade,which are in general consistent with ***,large uncertainties in spatial and temporal disaggregation of national budgets hinder the effectiveness of the method in verifying China's GHG budgets and improving NGHGI *** uncertainties are largely driven by differences in inversion models,observational coverage and methodological *** recommend improving observational networks,conducting model intercomparison exercises and refining inversion methods to better support China's GHG reporting and future climate goals.

关键词： carbon dioxide methane greenhouse gas atmospheric inversion China

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UKF‐MOT:An unscented Kalman filter‐based 3D multi‐object tracker

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CAAI Transactions on Intelligence technology 2024年第4期9卷 1031-1041页

作者： Meng Liu Jianwei Niu Yu Liu Collective Intelligence&Collaboration Laboratory China North Artificial Intelligence and Innovation Research InstituteBeijingChina China North Vehicle Research Institute BeijingChina State Key Laboratory of Software Development Environment School of Computer Science and EngineeringBeihang UniversityBeijingChina State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijingChina School of Computer Science and Engineering Beihang UniversityBeijingChina

Multi‐object tracking in autonomous driving is a non‐linear *** better address the tracking problem,this paper leveraged an unscented Kalman filter to predict the object's *** the association stage,the Mahalanobis distance was employed as an affinity metric,and a Non‐minimum Suppression method was designed for *** the detections fed into the tracker and continuous‘predicting‐matching’steps,the states of each object at different time steps were described as their own continuous *** conducted extensive experiments to evaluate tracking accuracy on three challenging datasets(KITTI,nuScenes and Waymo).The experimental results demon-strated that our method effectively achieved multi‐object tracking with satisfactory ac-curacy and real‐time efficiency.

关键词： autonomous vehicle transportation

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