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Catalytic ozonation treatment of papermaking wastewater by Ag-doped NiFe2O4 : Performance and mechanism

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Journal of Environmental Sciences 2020年第11期32卷 75-84页

作者： Junyu zhao Jiashun Cao yujie zhao Teng Zhang Di Zheng Chao Li Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China China United Engineering Corporation Limited Zhejiang 310000China

The catalytic ozonation treatment of secondary biochemical effluent for papermaking wastewater by Ag-doped nickel ferrite was ***-doped catalysts prepared by sol-gel method were characterized,illustrating that Ag entirely entered the crystalline of Ni Fe2O4 and changed the surface *** addition of catalyst enhanced the removal efficiency of chemical oxygen demand and total organic *** results of gas chromatography-mass spectrometer,ultraviolet light absorbance at 254 nm and threedimensional fluorescence excitation-emission matrix suggested that aromatic compounds were efficiently degraded and toxic substances,such as dibutyl *** addition,the radical scavenging experiments confirmed the hydroxyl radicals acted as the main reactive oxygen species and the surface properties of catalysts played an important role in the ***,this work validated potential applications of Ag-doped Ni Fe2O4 catalyzed ozonation process of biologically recalcitrant wastewater.

关键词： Papermaking wastewater Secondary effluent Nickel ferrite Ag-doping Catalytic ozonation

Reinforcement learning method for machining deformation control based on meta-invariant feature space

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Visual Computing for Industry,Biomedicine,and Art 2022年第1期5卷 323-339页

作者： yujie zhao Changqing Liu Zhiwei zhao Kai Tang Dong He College of Mechanical and Electrical Engineering/National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China The Smart Manufacturing Thrust Hong Kong University of Science and Technology(GZ)Guangzhou 511458China

Precise control of machining deformation is crucial for improving the manufacturing quality of structural aerospace *** the machining process,different batches of blanks have different residual stress distributions,which pose a significant challenge to machining deformation *** this study,a reinforcement learning method for machining deformation control based on a meta-invariant feature space was *** proposed method uses a reinforcement-learning model to dynamically control the machining process by monitoring the deformation ***,combined with a meta-invariant feature space,the proposed method learns the internal relationship of the deformation control approaches under different stress distributions to achieve the machining deformation control of different batches of ***,the experimental results show that the proposed method achieves better deformation control than the two existing benchmarking methods.

关键词： Machining deformation Residual stress Deformation control Meta-invariant feature space Reinforcement learning

Enrichment of Cd^(2＋) from water with a calcium alginate hydrogel filtration membrane

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Science China(Technological Sciences) 2018年第3期61卷 438-445页

作者： zhao yujie zhao KongYin LI Ye LIU Liang ZHANG XinXin LI JinGang CHEN Min WANG XiaoLei Key Laboratory for Environmental Factors Control of Agro-product Quality Safety Agro-Environmental Protection Institute Ministry of Agriculture Tianjin 300191 China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Polytechnic University Tianjin 300387 China Tianjin Eco-City Environmental Protection Co. Ltd. Tianjin 300467 China

A new method was developed for effective enrichment of Cd2+ ions from water with a calcium alginate(CaAlg) hydrogel filtration membrane. First, the CaAlg hydrogel filtration membrane was prepared without a pore-forming agent. This membrane was used to remove Cd^(2+) via ion exchange with Ca^(2+), and the Cd^(2+) was preserved in the CaAlg hydrogel. Then, the CaAlg hydrogel containing Cd^(2+) was soaked in a sodium citrate solution, and the hydrogel was fully dissolved. The removal rate of the CaAlg filtration membrane reached almost 100% within 120 min when the Cd^(2+) concentration was under 1 mg/L. Factors affecting the removal rate were investigated, such as NaAlg concentration, operating pressure, operating time and the initial concentration of Cd^(2+). The effects of initial Cd^(2+) concentration, pressure and filtration time on the enrichment factor were also investigated. The results show that the enrichment factor reached 87.3 when the pressure was 0.18 MPa and the filtration time was 240 min. Different enrichment factors could be achieved by adjusting the operating pressure and filtration time.

关键词： calcium alginate hydrogel filtration membrane Cd^(2+) ion removal enrichment

Orthorhombic HoMnO_3/Nb-doped SrTiO_3 epitaxial heterojunctions fabricated by pulsed laser deposition

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Science China(Physics,Mechanics & Astronomy) 2011年第11期54卷 1977-1980页

作者： zhao yujie YUAN DeHua ZHANG LiXin DAI ZhenHong WANG WeiTian Institute of Opto-Electronic Information Science and Technology Yantai University Yantai 264005 China

Orthorhombic HoMnO 3 films with a-axis orientations were prepared epitaxially on Nb-1.0wt%-doped SrTiO 3 single crystal substrates by using the pulsed laser deposition technique to fabricate all-oxide heterojunctions.X-ray diffraction and atomic force microscopy were then used to characterize the *** temperature dependent current-voltage measurement displayed diode-like rectifying behavior,and the forward current was perfectly fitted using the thermionic emission *** ideality factor and built-in potential were suggested.

关键词： heterojunctions orientation rectifying behavior

High-performance and multifunctional organic field-effect transistors

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Chinese Chemical Letters 2023年第9期34卷 100-118页

作者： yujie zhao Wei Wang Zihan He Boyu Peng Chong-An Di Hanying Li MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Organic field-effect transistors(OFETs)refer to field-effect transistors that use organic semiconductors as channel *** to the advantages of organic materials such as solution processability and intrinsic flexibility,OFETs are expected to be applicable in emergent technologies including wearable electronics and sensors,flexible displays,internet-of-things,neuromorphic computing,*** the electrical performance and developing multifunctionalities of OFETs are two major and closely relevant aspects for OFETs-related *** former one aims for investigating the device physics and expanding the horizons of OFETs,while the later one is critical for leading OFETs into practical and emergent *** development in each of the two aspects would undoubtfully promote the other and bring more confidence for future development of ***,this review is divided into two parts that respectively summarize the recent progress in high-performance OFETs and multifunctional OFETs.

关键词： Organic filed-effect transistors Organic semiconductors High-performance Multifunctionality Organic electronics

Selective capture and separation of xenon and krypton using metal organic frameworks: a review

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 1895-1912页

作者： Yilun Zhou Jingyi Wang yujie zhao He Gu Zhongshan Chen Hui Yang Xiangke Wang College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China

Xenon and krypton are widespread useful noble gases in commercial lighting, lasers, electronics, and medical industry. At the same time, radioactive noble gases may proliferate from used nuclear fuel and diffuse in open atmospheres. Metal organic frameworks as hotspot porous materials for gases uptake and separation are considered to be potential solutions. In this review, we comprehensively summarized recent researches on metal organic frameworks for selective capture and separation of xenon and krypton. Particularly, we followed the aspects of different optimal design strategies, including optimal pore/cage size and geometry, open metal sites, ions (anions and cations), and polar functional groups for enhancing the xenon adsorption and separation performances. Meanwhile, a comparison of each strategy and the mechanisms of xenon/krypton separation were pointed out. The separation of krypton from gases mixtures by dual-bed systems was further discussed. Finally, some existing challenges and opportunities for possible real applications were proclaimed.

关键词： metal organic frameworks xenon krypton selective separation used nuclear fuel

Micro-distribution and mechanical characteristics analysis of remaining oil

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Petroleum 2017年第4期3卷 483-488页

作者： Hongxia Sun yujie zhao Jun Yao School of Petroleum Engineering China University of Petroleum(East China)QingdaoChina Shengli Oilfield Company SINOPECDongyingChina

As the water drive reservoir enters extra high water cut stage(greater than 80%),remaining oil distribution becomes increasingly *** on micro residual oil in pore appears particularly important for reservoir development at extra high water cut *** occurrence characteristics recognition helps to understand the distribution of remaining oil and the mechanical characteristics of oil is the guide for tapping the remaining *** the basis of pore scale oil ewater two phase flow experiments,micro distribution of remaining oil is divided into four occurrence states in accordance with oil features at different stage of water flooding,the flake of remaining oil,oil column,oil droplet and oil film.A quantitative characterization method of remaining oil occurrence states is *** using micro numerical simulation method,change rules of four occurrence states of remaining oil during the process of water displacement and the mechanical characteristics of different occurrence state of remaining oil are *** show that the continuous oil phase gradually transforms to discontinuous phase and even to dispersed phases during the water flooding *** extra high water cut stage,most of remaining oil are dispersed oil columns,oil droplets and oil films,which are the main target of remaining oil to be *** changing water flow direction or increasing the displacement pressure gradient,the surface adsorption force acting on oil columns are overcome,and then the oil columns begin to move and finally to be produced *** droplets in pore-throat center are scoured and carried out by water as the increase of the injection volume,while the oil droplets in blind ends and the oil films are extracted out by adding chemicals to reduce the interfacial tension,so as to enhance oil *** water flooding reservoir,the corresponding tapping measures for four types of oil occurrence states brought forward have great meanings of improving reservoi

关键词： Pore scale Remaining oil Occurrence characteristics Mechanical characteristics Extra high water cut stage

COF-based membranes for liquid phase separation:Preparation,mechanism and perspective

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Journal of Environmental Sciences 2024年第7期141卷 63-89页

作者： yujie zhao He Gu Yilun Zhou CaimeiWen Xiaolu Liu Suhua Wang Zhongshan Chen Hui Yang Xiangke Wang College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China School of Environmental Science and Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China

Covalent organic frameworks(COFs)are a new kind of crystalline porous materials composed of organic molecules connected by covalent bonds,processes the characteristics of low density,large specific surface area,adjustable pore size and structure,and easy to functionalize,which have been widely used in the field of membrane separation ***,there are more and more researches focusing on the preparation methods,separation application,and mechanism of COF membranes,which need to be further summarized and *** this review,we primarily summarized several conventional preparation methods,such as two-phase interfacial polymerization,in-situ growth on substrate,unidirectional diffusion method,layer-by-layer assembly method,mixed matrix membranes,and so *** advantages and disadvantages of each method are briefly *** application potential of COF membrane in liquid separation are introduced from four aspects:dyeing wastewater treatment,heavy metal removal,seawater desalination and oil-water ***,the mechanisms including pore structure,hydrophilic/hydrophobic,electrostatic repulsion/attraction and Donnan effect are *** the efficient removal of different kind of pollutions,researchers can select different ligands to construct membranes with specific pore size,hydrophily,salt or organic rejection ability and functional *** ideas for the design and preparation of COF membranes are ***,the future direction and challenges of the next generation of COF membranes in the field of separation are prospected.

关键词： Covalent organic frameworks Membrane materials Liquid phase separation Separation mechanism

Point cloud simplification algorithm based on particle swarm optimization for online measurement of stored bulk grain

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International Journal of Agricultural and Biological Engineering 2016年第1期9卷 71-78页

作者： Shao Qing Xu Tao Yoshino Tatsuo zhao yujie Yang Wenting Zhu Hang School of Mechanical Science and Engineering Jilin UniversityChangchun 130022China Jilin Academy of Agricultural Machinery Changchun 130022China

The simplification of 3D laser scanning point cloud is an important step of surface reconstruction and volume estimation of bulk grain in *** study presented an adaptive simplification algorithm based on particle swarm optimization(PSO).It introduced PSO into the average distance method,a conventional simplification *** basic idea of this algorithm was to adaptively determine the optimal point reducing intervals of scanning lines according to original point cloud density by *** using the 3D point cloud scanned from bulk grain surface in granary,the proposed algorithm was *** with the average distance method,the proposed algorithm obtained more evenly distributed point set,smaller reduction ratio(6.96%)and higher volume estimation accuracy(relative error was less than 3‰).The 3D laser scanner(GSLS003,Jilin University and SkyViTech Co.,Ltd.,Hangzhou,China)used in this study could scan the complete picture of the grain surface in a granary in one time,so the acquired point cloud data do not have to be *** the good simplification performance and capability of updating the reducing interval at any moment,the proposed algorithm and the 3D laser scanner could be used to realize online real-time measurement of stored bulk grain volume in granary.

关键词： point cloud simplification algorithm particle swarm optimization(PSO) 3D laser scanning large object stored grain