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Chinese Journal of Chemistry 2016年第8期34卷 795-800页

作者： pan zhou dawei he Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beo'ing Jiaotong University Beijing 100044 China

In this study, core‐shell structured Li 3 V 2 (PO 4 ) 3 /C wrapped in graphene nanosheets has been successfully prepared. The reduction of graphene oxide and the synthesis of Li 3 V 2 (PO 4 ) 3 /C are carried out simultaneously using a chemical route followed by a solid‐state reaction. The effects of conducting graphene are studied by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra and electrochemical measurements. The results reveal that the graphene sheets not only form a compact and uniform coating layer throughout the Li 3 V 2 (PO 4 ) 3 /C, but also stretch out and cross‐link into a conducting network around the Li 3 V 2 (PO 4 ) 3 /C particles. Thus, the graphene decorated Li 3 V 2 (PO 4 ) 3 /C electrode exhibits superior high‐rate capability and long‐cycle stability. It delivers a reversible discharge capacity of 178.2 mAh·g −1 after 60 cycles at a current density of 0.1 C, and the rate performances of 176, 169.3, 156.1 and 135.7 mAh·g −1 at 1, 2, 5 and 10 C, respectively. The superior electrochemical properties make the graphene decorated Li 3 V 2 (PO 4 ) 3 /C composite a promising cathode material for high‐performance lithium‐ion battery.

关键词： lithium‐ion battery cathode material Li3V2(PO4)3/C graphene nanosheet electrochemical performance

iNet:visual analysis of irregular transition in multivariate dynamic networks

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Frontiers of Computer Science 2022年第2期16卷 124-139页

作者： Dongming HAN Jiacheng pan Rusheng pan dawei zhou Nan CAO Jingrui he Mingliang XU Wei CheN State Key Lab of CAD&CG Zhejiang UniversityHangzhou 310058China Department of Computer Science and Engineering Arizona State UniversityArizona 85287America Tong Ji Intelligent Big Data Visualisation Lab(iDVx Lab) TongJi UniversityShanghai 200082China Department of Computer Science and Technology Zhengzhou UniversityZhengzhou 450001China

Multivariate dynamic networks indicate networks whose topology structure and vertex attributes are evolving along *** are common in multimedia *** detection is one of the essential tasks in analyzing these networks though it is not well *** this paper,we combine a rare category detection method and visualization techniques to help users to identify and analyze anomalies in multivariate dynamic *** conclude features of rare categories and two types of anomalies of rare *** we present a novel rare category detection method,called DIRAD,to detect rare category candidates with *** develop a prototype system called iNet,which integrates two major visualization components,including a glyph-based rare category identifier,which helps users to identify rare categories among detected substructures,a major view,which assists users to analyze and interpret the anomalies of rare categories in network topology and vertex ***,including an algorithm performance evaluation,a case study,and a user study,are conducted to test the effectiveness of proposed methods.

关键词： multivariate dynamic networks rare categories anomaly detection visual analysis

Structural Characterization and NO Generation Characteristics of Coal Char under O_(2)/CO_(2)Atmosphere

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Journal of Thermal Science 2021年第4期30卷 1237-1250页

作者： YAN dawei GU Mingyan he Xianhui WANG Jialun WANG Fuling pan Jizhen School of metallurgical Engineering School of Energy and EnvironmentAnhui University of TechnologyMa’anshan 243002China

The evolution of pore structure and functional groups of coal char in different stages of Shenhua coal combustion process in O_(2)/CO_(2)atmosphere was studied by the low temperature nitrogen adsorption method,the scanning electron microscopy and the FTIR *** relationship between the pore structure,oxygen-containing functional groups and NO generation characteristics of coal char under different inlet oxygen concentrations was *** result shows that the overall pore structure and shape of pulverized coal particles change continuously with the combustion;and the oxygen-containing functional groups on the surface of coal char indicate multi-peak changes and are related to NO *** oxygen concentration poses a larger impact on the change in coal particle size,oxygen-containing functional groups and NO generation;and there is an oxygen concentration that optimizes the reduction effect of the oxygen-containing functional group on NO.

关键词： O_(2)/CO_(2)atmosphere pore structure FTIR oxygen-containing functional group NO generation

A quantitative evaluation of the factors influencing the air-sea carbon dioxide transfer velocity

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Acta Oceanologica Sinica 2016年第11期35卷 68-78页

作者： YU Tan pan Delu BAI Yan he Yijun LI dawei LIANG Chao State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyStale Oceanic AdministrationHangzhou 310012China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Collaborative Innovation Center for National Distant-water Fisheries Shanghai 201306China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China College of Applied Art and Design Shanghai Second Polytechnic UniversityShanghai 201209China

The numerous factors influencing the air-sea carbon dioxide（CO_2） transfer velocity have been discussed for many years, yet the contributions of various factors have undergone little quantitative estimation. To better understand the mechanism of air-sea transfer, the effects of different factors are discussed on the air-sea transfer velocity and the various parametric models describing the phenomenon are classified and ***, based on GAS EX-98 and ASGAMAGE data, wind models are evaluated and the effects of some factors are discussed quantitatively, including bubbles, waves, wind and so on by considering their interaction through a piecewise average approach. It is found that the air-sea CO_2 transfer velocity is not only the function of the wind speed, but is also affected by bubbles, wave parameters and other factors. Stepwise and linear regressions are used. When considering the wind speed, bubbles mediated and the significant wave height, the root mean square error is reduced from 34.53 cm/h to 16.96 cm/h. Discussing the various factors quantitatively can be useful in future assessments of a large spatial scale and long-term air-sea CO_2 flux and global change.

关键词： influence factors transfer velocity carbon dioxide quantitatively

A 3D sliced-soil-beam model for settlement prediction of tunnelling using the pipe roofing method in soft ground

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1934-1948页

作者： Yu DIAO Yiming XUE Weiqiang pan Gang ZheNG Ying ZHANG dawei ZHANG Haizuo zhou Tianqi ZHANG Key Laboratory of Coastal Civil Engineering Structure and Safety of Ministry of Education Tianjin UniversityTianjin 300072China Department of Civil Engineering Tianjin UniversityTianjin 300072China Shanghai Tunnel Engineering Construction Co. Ltd.Shanghai 200032China Tianjin Municipal Engineering Design&Research Institute Tianjin 300392China

The pipe roofing method is widely used in tunnel construction because it can realize a flexible section shape and a large section area of the tunnel,especially under good ground ***,the pipe roofing method has rarely been applied in soft ground,where the prediction and control of the ground settlement play important *** study proposes a sliced-soil-beam(SSB)model to predict the settlement of ground due to tunnelling using the pipe roofing method in soft *** model comprises a sliced-soil module based on the virtual work principle and a beam module based on structural *** part of this work,the Peck formula was modified for a square-section tunnel and adopted to construct a deformation mechanism of soft *** pipe roofing system was simplified to a threedimensional Winkler beam to consider the interaction between the soil and pipe *** model was verified in a case study conducted in Shanghai,China,in which it provided the efficient and accurate prediction of ***,the parameters affecting the ground settlement were *** was clarified that the stiffness of the excavated soil and the steel support are the key factors in reducing ground settlement.

关键词： pipe roofing method soft ground numerical simulation settlement prediction simplified calculation parametric analysis

heavy metals in sediments of Yellow Sea and East China Sea: Chemical speciation,distribution,influence factor,and contamination

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Journal of Oceanology and Limnology 2021年第4期39卷 1277-1292页

作者： Miao ZHAO Shenghui ZHANG Haitao HAN dawei pan Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Coastal Environmental ProcessesResearch Center for Coastal Environment Engineering Technology of Shandong ProvinceYICCASYantai 264003China University of Chinese Academy of Sciences Beijing 100049China

Metal species and the degree of environmental pollution are related to the hydrogen sulfide(H_(2)S),an important product of early diagenesis that can react with metals to form stable *** investigate the eff ects of H_(2)S to metals and evaluate metal environment eff ect in the sediments of the East China Sea(ECS)and Yellow Sea(YS),geochemical characteristic and spatial distribution of nine heavy metals and H_(2)S profile were *** H_(2)S content and lower metal content was observed in the sediments 10 cm in depth in the North Yellow Sea and the west coast of South *** pollution load index(I_(pl))indicates that the southern coast of Shandong Peninsula underwent moderate pollution(I_(pl)=1)of heavy metals and no heavy metal pollution appeared in other areas(I_(pl)he ecological risk of Cd and As enrichment was moderately severe in all *** chance of heavy metal combination to be toxic in ECS and YS during summer was 21%.In addition,correlation between H_(2)S content and metals in both solid and porewater phases was obvious,corroborating important eff ect of H_(2)S on metal ***,H_(2)S could aff ect the spatial distributions of heavy metals in porewater directly and be indicative of potential biological eff ects of combined toxicant groups in the study region.

关键词： hydrogen sulfide heavy metal East China Sea and Yellow Sea sediment porewater risk assessment

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Distribution characteristics and controlling factors of typical heavy metals in Huanghe River estuary,China

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Journal of Oceanology and Limnology 2023年第1期41卷 150-165页

作者： Yuxi LU dawei pan Tingting YANG Chenchen WANG Institute of Oceanology Chinese Academy of SciencesQingdao 266071China CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Shandong Key Laboratory of Coastal Environmental ProcessesResearch Center for Coastal Environment Engineering Technology of Shandong ProvinceYantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Chemical Engineering Yantai UniversityYantai 264005China

The geochemical characteristics and potential controlling factors of colloidal Zn,Cd,and Pb in Huanghe(Yellow)River estuary(HRE),China were *** three metals were highly variable over a range of spatiotemporal scales,comprehensively forced by various physical and biological *** dissolved Zn,Cd,and Pb varied from 200.1 to 321.7,2.6 to 4.1,and 0.5 to 1.0 nmol/L,*** one near-estuarine station of Zn had contamination factor values>1,which indicate the lower contaminant *** dissolved species of Zn,Cd and Pb were fractionated,namelyhe main fraction of the three dissolved metals(50%-62%),while the 100-kDa-0.45-μm high molecular weight colloidal fraction was dominant in their respective colloidal *** input and sediment acted as important sources of strong ligands and natural colloids for the HRE water system.he dissolved oxygen,the behaviors of colloidal Zn and 3-10-kDa Pb were related to dissolved organic carbon(DOC).However,no significant correlation between each dissolved fraction of Cd and salinity,pH,temperature,colloidal organic carbon,and DOC was found in this ***,these findings,completed by the evaluation of the dissolved species of Zn,Cd,and Pb at 10 sites over the river-sea mixing zone,provided new insights into the colloidal heterogeneity that affect metals geochemical features,migration and fate in estuaries.

关键词： colloidal heavy metal size fraction Huanghe(Yellow)River estuary geochemical feature

Microstructure,Properties,and Grain Growth Kinetics of Mo-5Ta Refractory Sputtering Targets Prepared by SPS

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Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1248-1254页

作者： LIU dawei YANG Xiaolong HUANG Lei pan Yafei ZHANG Jiuxing School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationHefei University of TechnologyHefei 230009China

Mo-5Ta targets were prepared by the spark plasma sintering(SPS)technology under the sintering temperatures of 1400-1600℃,the holding times of 0-20 min,and the axial pressure of 30 *** microstructure,performance,and grain growth kinetics of Mo-5Ta sputtering targets were *** the increase of sintering temperatures and times,Ta can more dissolve in Mo and form a Mo(Ta)solid *** grain sizes of Mo-5Ta targets remain unchanged at low temperatures(1400-1500℃)while increasing significantly at high temperature(1600℃)with the extension of the holding *** addition,the densities and Vickers hardness(HV_(0.5))first ascend and then decrease with sintering *** thermal conductivity is positively correlated with the grain size and density,as a result of their joint *** on the comprehensive analysis,the grain growth is dominated by the combination of boundary diffusion and volume *** n=2,the activation energies of grain growth under holding times of 5,10,20 min are calculated as 762.70,617.86,and 616.52 kJ/mol,respectively.

关键词： SPS Mo-5Ta targets structure properties grain growth kinetics

PSegNet: Simultaneous Semantic and Instance Segmentation for Point Clouds of Plants

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Plant Phenomics 2022年第1期4卷 261-280页

作者： dawei Li Jinsheng Li Shiyu Xiang Anqi pan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Information Sciences and TechnologyDonghua UniversityShanghai 201620China Engineering Research Center of Digitized Textile&Fashion Technology Ministry of EducationDonghua UniversityShanghai 201620China College of Information Sciences and Technology Donghua UniversityShanghai 201620China

Phenotyping of plant growth improves the understanding of complex genetic traits and eventually expedites the development of modern breeding and intelligent *** phenotyping,segmentation of 3D point clouds of plant organs such as leaves and stems contributes to automatic growth monitoring and reflects the extent of stress received by the *** this work,we first proposed the Voxelized Farthest Point Sampling(VFPS),a novel point cloud downsampling strategy,to prepare our plant dataset for training of deep neural networks.

关键词： breeding eventually organs

Tribological and tribochemical properties of magnetite nanoflakes as additives in oil lubricants

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Particuology 2014年第6期12卷 136-144页

作者： Longhua Xiang Chuanping Gao Yanmin Wang Zhidong pan dawei Hu College of Materials Science and Engineering South China University of Technology Key Laboratory of Specially Functional Material under Ministry of Education

This detailed the tribological and tribochemical properties of magnetite（Fe3O4） nanoflakes used as additives in #40 base oil in a four-ball *** average friction coefficient of the friction pair for lubricant containing the Fe3O4 nanoflakes of 1.5 wt%as a lubricant additive in the base oil is decreased by18.06%compared to that of solely base *** chemical composition of base oil with the Fe3O4 nanoflake additives did not change during the 48-h friction *** decreased saturation magnetization and increased coercivity of magnetite nanoflakes occurred due to the distortion of the basal planes and the presence of hematite（α-Fe3O4） generated by the tribochemical reactions during the friction *** multi-layer low-shear-stress tribochemical lubrication films on the surface of the friction pair could form because the nanoflake particles arrange and adhere onto the surface of the friction pair in an orderly manner,and the tribochemical reactions of the friction pair in the presence of the nanoflakes occur as Fe→FeO→Fe3O4→γ-FeOOH →γ-Fe2O3→α-*** formation of the films can improve the tribological properties.

关键词： Nanoflake particles Magnetite Lubricant additive Tribology Tribochemical properties