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Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

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Chinese Journal of Chemical Engineering 2021年第9期34卷 168-174页

作者： Zhong Ma Chuan Yuan Shuai Zhang Yonggang lu Junhui xiong School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Chemical looping combustion(CLC)is a clean and efficient flame-free combustion technology,which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO_(2)*** development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC *** the solid by-product from the sulfuric acid production,pyrite cinder presented excellent redox performance as an oxygen carrier in CLC *** main components in pyrite cinder are Fe_(2)O_(3),CaSO_(4),Al_(2)O_(3)and SiO_(2)in which Fe_(2)O_(3)is the active component to provide lattice *** order to systematic investigate the functions of supports(CaSO_4,Al_(2)O_(3)and SiO_(2))in pyrite cinder,three oxygen carriers(Fe_(2)O_(3)-CaSO_(4),Fe_(2)O_(3)-Al_(2)O_(3)and Fe_(2)O_(3)-SiO_(2))were prepared and evaluated in this *** results showed that Fe_(2)O_(3)-CaSO_(4) displayed high redox activity and cycling stability in the multiple redox ***,both Fe_(2)O_(3)-Al_(2)O_(3)and Fe_(2)O_(3)-SiO_(2)experienced serious deactivation during redox *** indicated that the inert Fe-Si solid solution(Fe_(2)SiO_(4))was formed in the spent Fe_(2)O_(3)-SiO_(2)sample,which decreased the oxygen carrying capacity of this *** XPS results showed that the oxygen species on the surface of Fe_(2)O_(3)-CaSO_(4) could be fully recovered after the 20 redox *** can be concluded that CaSO_(4) is the key to the high redox activity and cycling stability of pyrite cinder.

关键词： Chemical looping Pyrite cinder Supports Fixed-bed Redox performance Waste treatment

Thermodynamics and Magnetostriction of Fe-Co-B-Si-Nb-C Bulk Metallic Glasses

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Journal of Iron and Steel Research International 2013年第2期20卷 58-61页

作者： GAO Zhen NI xiao-jun GUO Jin-hua LI De-ren lu Zhi-chao ZHOU Shao-xiong Advanced Technology and Materials Co Ltd China Iron and Steel Research Institute Group

Fe-Co-B-Si-Nb-C glassy alloy with the addition of C was prepared by arc melting and copper suck-casting. The thermodynamics and soft magnetic properties were investigated. The casted amorphous alloys were heat-treated at different temperatures. The differential scanning calorimeter （DSC） results and thermal expansion show complete thermodynamics of crystallization. Its magnetostriction properties were studied by capacitance method. Saturation magnetostriction increases to 38×10^-6. The amorphous alloy exhibits good soft magnetic properties with low coercivity and high saturation magnetic induction. The results show that minor addition of C is beneficial to enhance the saturation magnetostriction λs, and do not deteriorate the ability of forming amorphous.

关键词： amorphous material soft magnetic material magnetostriction thermal expansion

Effect of rare earth content on microstructure and corrosion resistance of hot-dip Zn-5Al alloy coated steel wire for bridge cables

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Journal of Iron and Steel Research International 2023年第10期30卷 2101-2110页

作者： xiao-xiong Zhu Yi-fu Shen Cheng-tao Li Xiang Dai Guo-hao xiao College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 211106JiangsuChina Jiangsu Tokyo Rope Co. Ltd.Jiangyin 214425JiangsuChina Nanjing Vocational University of Industry Technology Nanjing 210023JiangsuChina

The effects of the content of rare earth elements on the microstructure and properties of hot-dip Zn-5 Al alloy steel wire for bridge cables were *** microstructure of the hot-dip coating was analyzed using an optical microscope and a scanning electron microscope equipped with an energy-dispersive *** bonding force between the hot-dip coating and steel wire was determined by the winding *** corrosion resistance of the steel wire hot-dip coating was tested by the electrochemical *** hot-dip Zn-5A1 alloy coating has a corrosion-resistant structure composed of a zinc-rich phase and an aluminum-rich *** to the enhanced bonding force,the micro structure of the hot-dip coating of the Zn-5A1 alloy with rare earth elements is more compact and uniform than that without rare earth *** addition of rare earth elements improves the corrosion resistance of Zn-5A1 alloy coated steel *** to the rare earth segregation,which prevents the corrosion of the grain boundary and enhances the anti-intergranular corrosion performance,steel wire exhibits the optimum corrosion resistance when the content of rare earth elements is 0.08 wt.%.

关键词： Bridge cable steel wire Hot dipping Rare earth content Corrosion resistance Microstructure

Application of Digital Twin in Smart Battery Management Systems

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 1-19页

作者： Wenwen Wang Jun Wang Jinpeng Tian Jiahuan lu Rui xiong Advanced Energy Storage and Application Group National Engineering Laboratory for Electric VehiclesSchool of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China

Lithium-ion batteries have always been a focus of research on new energy vehicles,however,their internal reactions are complex,and problems such as battery aging and safety have not been fully *** view of the research and preliminary application of the digital twin in complex systems such as aerospace,we will have the opportunity to use the digital twin to solve the bottleneck of current battery ***,this paper arranges the development history,basic concepts and key technologies of the digital twin,and summarizes current research methods and challenges in battery modeling,state estimation,remaining useful life prediction,battery safety and ***,based on digital twin we describe the solutions for battery digital modeling,real-time state estimation,dynamic charging control,dynamic thermal management,and dynamic equalization control in the intelligent battery management *** also give development opportunities for digital twin in the battery *** we summarize the development trends and challenges of smart battery management.

关键词： Digital twin Battery management system Battery model Remaining useful life prediction Dynamic control

Acceleration of floc-water separation and floc reduction with magnetic nanoparticles during demulsification of complex waste cutting emulsions

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Journal of Environmental Sciences 2020年第3期32卷 80-89页

作者： Yongjiao xiong Xiangfeng Huang Bin lu Baoqiang Wu Lijun lu Jia Liu Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai200092China

Waste cutting emulsions are difficult to treat efficiently owing to their complex composition and stable emulsified *** an important treatment method for emulsions,chemical demulsification is faced with challenges such as low flocs-water separation rates and high sludge ***,in this study,Fe3O4 magnetic nanoparticles(MNPs)were used to enhance chemical demulsification performance for treating waste cutting emulsions under a magnetic *** addition of MNPs significantly decreased the time required to attain sludge-water separation and sludge compression equilibrium,from 210 to 20 *** addition,the volume percentage of sludge produced at the equilibrium state was reduced from 45% to 10%.This excellent flocculation-separation performance was stable over a pH range of *** magnetization of the flocculants and oil droplets to form a flocculant-MNP-oil droplet composite,and the magnetic transfer of the composite were two key processes that enhanced the separation of cutting ***,the interactions among MNPs,flocculants,and oil droplets were important in the magnetization process,which was controlled by the structures and properties of the three *** the magnetic field,the magnetized flocculant-MNP-oil droplet composites were considerably accelerated and separated from water,and the sludge was simultaneously ***,this study expands the applicability of magnetic separation techniques in the treatment of complex waste cutting emulsions.

关键词： Waste cutting emulsion Magnetic nanoparticle Flocculation Separation Acceleration

Semi-supervised estimation of capacity degradation for lithium ion batteries with electrochemical impedance spectroscopy

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Journal of Energy Chemistry 2023年第1期76卷 404-413,I0010页

作者： Rui xiong Jinpeng Tian Weixiang Shen Jiahuan lu Fengchun Sun Department of Vehicle Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthornVictoria 3122Australia

Machine learning-based methods have emerged as a promising solution to accurate battery capacity estimation for battery management ***,they are generally developed in a supervised manner which requires a considerable number of input features and corresponding capacities,leading to prohibitive costs and efforts for data *** response to this issue,this study proposes a convolutional neural network(CNN)based method to perform end-to-end capacity estimation by taking only raw impedance spectra as *** importantly,an input reconstruction module is devised to effectively exploit impedance spectra without corresponding capacities in the training process,thereby significantly alleviating the cost of collecting training *** large battery degradation datasets encompassing over 4700 impedance spectra are developed to validate the proposed *** results show that accurate capacity estimation can be achieved when substantial training samples with measured capacities are ***,the estimation performance of supervised machine learning algorithms sharply deteriorates when fewer samples with measured capacities are *** this case,the proposed method outperforms supervised benchmarks and can reduce the root mean square error by up to 50.66%.A further validation under different current rates and states of charge confirms the effectiveness of the proposed *** method provides a flexible approach to take advantage of unlabelled samples for developing data-driven models and is promising to be generalised to other battery management tasks.

关键词： Lithium-ion battery Capacity degradation Electrochemical impedance spectroscopy Deep learning

Synergistic etching and intercalation enables ultrathin Ti_(3)C_(2)T_(x)and Nb_(2)CT_(x)MXene nanosheets

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Rare Metals 2023年第4期42卷 1175-1185页

作者： Qian-Qian xiong Tahir Muhmood Cheng-xiao Zhao Jing-San Xu xiao-Fei Yang College of Science Nanjing Forestry UniversityNanjing210037China School of Chemistry and Physics Science and Engineering FacultyQueensland University of TechnologyBrisbaneQLD4001Australia

Transition metal-containing MXene has shown great potential in the promising research fields,and its performance strongly depends on the composition,structure,dimension,and surface ***,rational design and controllable synthesis of ultrathin two-dimensional(2D)MXene nanosheets with uniform surface terminations are of great ***,the use of 2D MXene,particularly in solar-powered photocatalysis and electrocatalysis,is restricted by the formation of thick,multi-layered MXene flakes with a small interlayer spacing produced from the conventional hydrofluoric acid(HF)etching *** this work,we report a few-layer MXene nanosheets by solely employing a mixture of lithium fluoride and hydrochloric acid as the etching *** etching and intercalation technique endows MXene with ultrathin 2D nanostructures;moreover,the use of fluoride salt,rather than harmful HF,offers a safer and environmentally-friendly synthetic route for scalable green production of 2D *** the obtained Ti_(3)C_(2)T_(x)and Nb_(2)CT_(x)nanosheets show a highly efficient photoelectrochemical performance superior to highly stacked MXene *** work highlights a mild,simultaneous etching and delamination strategy for the development of high quality of 2D MXene nanosheets.

关键词： MXene Electrocatalysis Hydrogen evolution reaction(HER) Two-dimensional(2D)nanomaterials

You Are How You Behave-Spatiotemporal Representation Learning for College Student Academic Achievement

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Journal of Computer Science & Technology 2020年第2期35卷 353-367页

作者： xiao-Lin Li Li Ma Xiang-Dong He Hui xiong School of Business Nanjing UniversityNanjing 210093China Information Technology Services Center Nanjing UniversityNanjing 210093China School of Business Rutgers UniversityNewarkNJ 07102U.S.A.

Scholarships are a reflection of academic achievement for college *** traditional scholarship assignment is strictly based on final grades and cannot recognize students whose performance trend improves or declines during the *** paper develops the Trajectory Mining on Clustering for Scholarship Assignment and Academic Warning(TMS)approach to identify the factors that affect the academic achievement of college students and to provide decision support to help low-performing students attain better ***,we first conduct feature engineering to generate a set of features to characterize the lifestyles patterns,learning patterns,and Internet usage patterns of *** then apply the objective and subjective combined weighted k-means(Wosk-means)algorithm to perform clustering analysis to identify the characteristics of different student *** the difficulty in obtaining the real global positioning system(GPS)records of students,we apply manually generated spatiotemporal trajectories data to quantify the direction of trajectory deviation with the assistance of the PrefixSpan algorithm to identify low-performing *** experimental results show that the silhouette coefficient and Calinski-Harabasz index of the Wosk-means algorithm are both approximately 1.5 times to that of the best baseline algorithm,and the sum of the squared error of the Wosk-means algorithm is only the half of the best baseline algorithm.

关键词： academic achievement spatiotemporal trajectory feature engineering student segmentation

Structure-Property Relationship Analysis of D-Penicillamine-Derivedβ-Polythioesters with Varied Alkyl Side Groups

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Chinese Journal of Polymer Science 2023年第10期41卷 1555-1562页

作者： Chun-Yan Lyu Wei xiong Er-Qiang Chen Hua lu Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

The ring-opening polymerization of heterocyclic monomers and the reversed ring-closing depolymerization of corresponding polymers with neutral thermodynamics are broadly explored to establish a circular economy of next-generation ***(PTEs),analogues of polyesters,are emerging materials for this purpose due to their high refractive index,high crystallinity,dynamic property and *** this work,we synthesize and polymerize a series of D-penicillamine-derivedβ-thiolactones(NRPenTL)with varied side chain alkyl groups,and study the structure-property relationship of the resulting *** obtained PTEs exhibit tunable glass transition temperature in a wide range of 130–50℃,and melting temperature of 90–105℃.In addition,copolymerizations of monomers with different side chains are effective in modulating material *** obtained homo and copolymers can be fully depolymerized to recycle *** work provides a robust molecular platform and detailed structure-property relationship of PTEs with potential of achieving sustainable plastics.

关键词： β-Polythioesters Geminal dimethyl Structure-property relationship Chemical recycling to monomers