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Enhancing lithium-ion and electric conductive Li_(2)FeSiO_(4)cathode through in situ boron-doping and carbon-coating strategy

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Rare Metals 2022年第12期41卷 4055-4064页

作者： Hao-Xiang Li Jia-Hui Zhu Xiao-Bing Huang Tao Zhou Yu-Rong Ren Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Water Treatment Functional Materials Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion AircraftCollege of Chemistry and Materials EngineeringHunan University of Arts and ScienceChangde 415000China Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power BatterySchool of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China

The extremely low electrical conductivity and ion-diffusion coefficient of Li_(2)FeSiO_(4)limits its application as a cathode material in lithium-ion ***,in situ boron-doped Li_(2)FeSi_(1)-xB_(x)O_(4-δ)/C(x=0,0.01,0.03,0.05 and 0.07)at the Si site was prepared via the solid-state reaction method using pitch as the c arbon source.B doping in the lattice structure and a c arbon coating on the surface of the composites could effectively enhance the Li^(+)/electron ***,the reduced particle size of the active material with the relatively high specific area via borondoped modification could improve the wettability between the electrolyte and *** the synergistic effect of appropriate boron doping and carbon coating,it exhibits a good rate performance,specific capacity,and cycling *** a result,the as-prepared Li_(2)FeSi_(0.95)B_(0.05)O_(4-δ)/C cathode showed a high discharge capacity of 160.7mAh·g^(-1)at 0.2C,and the capacity retention rate was 96%after 100 cycles at *** work presents an effective path for designing advanced cathode materials for lithium-ion batteries.

关键词： Li_(2)FeSiO_(4) Carbon coating Boron doping Synergistic effect Lithium-ion battery

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Intelligent Building System Optimal Scheduling Based on Residential Electricity Characteristic

Intelligent Building System Optimal Scheduling Based on Resi...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Shuaihu Li Yi He Yuxi Zhou Hanmei Peng Hui Li Wenlang Deng Multi-energy collaborative control technology Hunan Engineering Research Center College of Information Engineering Xiangtan University Xiangtan China College of Information Engineering Xiangtan University Xiangtan China

In order to dig deep into the electric energy scheduling potential of building systems, this paper proposes a building energy storage system topology with dynamic reconfigurable battery network architecture. Firstly, the dispatchable margin index of controllable load in intelligent buildings is established by analyzing residents' electricity consumption characteristics. On this basis, based on the residents' electricity comfort and the actual schedulable margin of the building system during this period, an optimal scheduling model with the minimum daily operating cost of the building system is constructed. Finally, the IEEE 33-node distribution network system is taken as an example system, and the fast group search optimization algorithm (FCSO) is applied to solve and analyze the proposed model. The experimental results show that the model can effectively improve the energy consumption of new energy and reduce the power fluctuation of the building load.

关键词： Buildings Batteries Load modeling Dispatching Air conditioning Dynamic scheduling

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Quantitative analysis of the content of nitrogen and sulfur in coal based on laserinduced breakdown spectroscopy: effects of variable selection

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Plasma Science and technology 2020年第7期22卷 36-43页

作者： Fan DENG Yu DING Yujuan CHEN Shaonong ZHU Feifan CHEN Jiangsu Key Laboratory of Big Data Analysis Technology Nanjing University of Information Science&TechnologyNanjing 210044People's Republic of China Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science&TechnologyNanjing 210044People's Republic of China Jiangsu Engineering Research Center on Meteorological Energy Using and Control Nanjing University of Information Science&TechnologyNanjing 210044People's Republic of China

Coal is a crucial fossil energy in today’s society,and the detection of sulfir(S) and nitrogen(N)in coal is essential for the evaluation of coal ***,an efficient method is needed to quantitatively analyze N and S content in coal,to achieve the purpose of clean utilization of *** study applied laser-induced breakdown spectroscopy(LIBS) to test coal quality,and combined two variable selection algorithms,competitive adaptive reweighted sampling(CARS) and the successive projections algorithm(SPA),to establish the corresponding partial least square(PLS) *** results of the experiment were as *** PLS modeled with the full spectrum of 27,620 variables has poor accuracy,the coefficient of determination of the test set(R^2 P) and root mean square error of the test set(RMSEP) of nitrogen were 0.5172 and 0.2263,respectively,and those of sulfur were0.5784 and 0.5811,*** CARS-PLS screened 37 and 25 variables respectively in the detection of N and S elements,but the prediction ability of the model did not improve ***-PLS finally screened 14 and 11 variables respectively through successive projections,and obtained the best prediction effect among the three *** R^2 P and RMSEP of nitrogen were0.9873 and 0.0208,respectively,and those of sulfur were 0.9451 and 0.2082,*** general,the predictive results of the two elements increased by about 90% for RMSEP and 60% for R2 P compared with *** results show that LIBS combined with SPA-PLS has good potential for detecting N and S content in coal,and is a very promising technology for industrial application.

关键词： variable selection LIBS coal CARS and SPA

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A method for establishing a bearing residual life prediction model for process enhancement equipment based on rotor imbalance response analysis

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Chinese Journal of Chemical engineering 2024年第2期66卷 203-215页

作者： Feng Wang Haoran Li Zhenghui Zhang Yan Bai Hong Yin Jing Bian National Foundation Research Laboratory of Fault Prevention and Control in Hazardous Chemicals Production System Engineering Research Center of Chemical Technology SafetyBeijing University of Chemical TechnologyBeijing 100029China China Nuclear Power Engineering Co. LtdBeijing 100840China CNOOC Tianjin Chemical Research and Design Institute Co. LtdTianjin Key Laboratory of Energy and Chemical Explosion SafetyAcademician Expert Collaborative Innovation CenterTianjin 300131China

A rotating packed bed is a typical chemical process enhancement equipment that can strengthen micromixing and mass *** the operation of the rotating packed bed,the nonreactants and products irregularly adhere to the wire mesh packing in the rotor,thus resulting in an imbalance in the vibration of the rotor,which may cause serious damage to the bearing and material *** study proposes a model prediction for estimating the bearing residual life of a rotating packed bed based on rotor imbalance response *** method is used to determine the influence of the mass on the imbalance in the vibration of the rotor on bearing *** major influence on rotor vibration was found to be exerted by the imbalanced mass and its distribution radius,as revealed by the results of orthogonal *** implementing finite element analysis,the imbalance response curve for the rotating packed bed rotor was obtained,and a correlation among rotor imbalance mass,distribution radius of imbalance mass,and bearing residue life was established via data *** predicted value of the bearing life can be used as the reference basis for an early safety warning of a rotating packed bed to effectively avoid accidents.

关键词： Rotating packed bed Mass imbalance Harmonic response analysis Residual life Prediction model

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research on equivalent ice thickness monitoring model of overhead transmission lines based on representative span 3

Research on equivalent ice thickness monitoring model of ove...

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2024 3rd International Conference on New energy, energy Storage and Power engineering, NESP 2024

作者： Yin, Weihua Luo, Guocai Jian, Lingyun Liao, Tingjian Xiao, Qian Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China Hunan Spec. Equipment Electric Energy Conversion and Control Engineering Technology Research Center Shaoyang University Shaoyang422000 China State Grid Hunan Province Electric Power Company Shaoyang Power Supply Branch Shaoyang422000 China

This paper aims to enhance the precision and efficiency of the calculation model for the equivalent icing thickness of tangent towers. The current calculation model for equivalent icing thickness of transmission lines lacks consideration of the influence of representative spans and controlled meteorological conditions. It also overlooks the impact of the concentrated load of the tension insulator string on the suspension shape of the conductor, as well as the compensatory capability of the suspension insulator string to counteract stress on the overhead transmission lines when deflected, resulting in calculation deviations. To resolve these issues, this paper investigates the dynamic characteristics of transmission line parameters and proposes a calculation model for equivalent icing thickness based on the representative span. The improved model demonstrates enhanced efficiency and accuracy in measuring the equivalent icing thickness for on-line icing-monitoring of transmission lines. Experimental results confirm a reduction in relative error compared to reference values, with the relative error gradually decreasing as ice thickness increases, indicating enhanced accuracy. The efficacy of this model is substantiated through experiments, offering a more efficient and precise method for monitoring ice thickness in engineering applications. © Published under licence by IOP Publishing Ltd.

关键词： Ice

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Intelligent Building Load Scheduling Based on multi-Objective multi-Verse Algorithm

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energy and Power engineering 2021年第4期13卷 19-29页

作者： Jiangyong Liu Jiankang Liu Lv Fan Lingzhi Yi Huina Song Qingna Zeng College of Information Engineering & Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology Xiangtan University Xiangtan China Willfar Information Technologies Co. Ltd. Changsha China Lianhu Town Central Health Center Chongqing China

In the multi-objective of intelligent building load scheduling, aiming at the problem of how to select Pareto frontier scheme for multi-objective optimization algorithm, the current optimal scheme mechanism combined with multi-objective multi-verse algorithm is used to optimize the intelligent building load scheduling. The update mechanism is changed in updating the position of the universe, and the process of correction coding is omitted in the iterative process of the algorithm, which reduces the com-putational complexity. The feasibility and effectiveness of the proposed method are verified by the optimal scheduling experiments of residential loads.

关键词： Intelligent Building Load Scheduling multi-Objective Optimization multi-Objective multi-Verse Algorithm

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A nanoscale observation to explain the discrepancy of electron exchange capacities between biochar containing comparable surface redox-active moieties

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Biochar 2022年第1期4卷 503-517页

作者： Shasha Li Liming Shao Hua Zhang Xuemin Lu Fan Lü Pinjing He State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092People’s Republic of China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092People’s Republic of China Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092People’s Republic of China Shanghai Multi-Source Solid Waste Collaborative Treatment and Energy Engineering Technology Research Center ShanghaiPeople’s Republic of China

Biochar,possessing electron exchange capacities(EEC),is generally involved in environmental redox reactions due to the presence of redox-active moieties(RAMs).The phenomenon that chars containing comparable RAMs possess differential EEC revealed that the accessibility of RAMs is important to the redox ***,many studies have focused on the type of RAMs,whereas the distribution has been insufficiently ***,we achieved nanoscale observation of electroactive moieties on the surface of six chars using a conductive atomic force *** the two specific kinds of chars with submicron particles and opposite current distributions,the submicron particles took up only 1-4‰wt of biochar accounting for approximately 30-50%of electron-donating capacity(EDC),and electron-accepting capacity(EAC)became 87%and 1.40 times as before after removing submicron particles,***,the combined impact of RAMs and surface topography(that uneven distribution of RAMs resulted in outstanding EEC by enhancing accessibility)was ***,direct evidence of the link between char structure and EEC(that condensed aromatic structures were indispensable to EAC while both heteroatoms and amorphous aromatics contributed to EDC)was *** findings can aid in understanding the functions of biochar in biotic and abiotic redox processes.

关键词： Biochar Pyrogenic chars Redox property Electron exchange capacity C-AFM

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Passive Integrations for Г-Z Source & DAB DC-AC Bidirectional Converter

Passive Integrations for Г-Z Source & DAB DC-AC Bidirection...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Jie Xiong Jianhong Jia Cheng Deng College of Electrical Engineering ZheJiang University Hangzhou China School of Transport Manegement Hunan Railway Professional Technology College Zhuzhou China Hunan Multi-energy Collaborative Control Engineering Technology Research Center Xiangtan University Xiangtan China

ISBN: (纸本)9781538683316

In order to increase the stability and improve the transfer efficiency of PV (Photovoltaic) micro-inverter, match the requirement of grid and achieve a clean energy, a novel topology is put forward which consists one ⌈-Z source boost converter, one DAB (dual-active bridge) converter for DC to DC, one inverter with LCL filter, and one DAB converter for battery. Furthermore, two integrated units for ⌈-Z source and LCL filter with planar PCB (printed circuit board) integration technique, and one integrated unit for two DAB converters with FMLF (flexible multi-layer foil) integration technique are proposed to reduce the volume and weight of the novel topology. Moreover, the parameter design of the FMLF integrated unit is underlined. And one prototype is built to prove the feasibility of the proposed ideas for a 400 W novel topology.

关键词： Topology Inductors Inverters Power harmonic filters Batteries Prototypes Dielectrics

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Biological denitrification driven by hydrochar: Insight into the mechanism from intracellular and extracellular electron transfer

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Journal of Environmental Chemical engineering 2025年第4期13卷

作者： Shengjie Chen Zequan Cao Zhu Wang Qing Yong Wei Peng Fubing Yao Kun Luo Bo Li Dongbo Wang Xiaoming Li Qi Yang College of Environmental Science and Engineering Hunan University Changsha 410082 PR China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China School of Metallurgy and Environment Central South University Changsha 410083 PR China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha 410083 PR China Department of Materials and Environmental Engineering Changsha University Changsha 410003 PR China School of Environment and Energy South China University of Technology Guangzhou 510006 PR China

Hydrochar (HC), a typical biochar is found to enhance the biological denitrification, but its intrinsic mechanism, especially under carbon source limitation, remains understudied. In this study, the effects of HCs prepared from banana peel, rice straw and pine, as well as their HC-derived dissolved substance (HC-DS) and HC-DS-removed residual biochar (R-HC) on denitrification were investigated at low carbon-nitrogen ratio (C/N = 1). The results showed that the denitrification was promoted by all HCs with the efficiency ranking as HC>R-HC>HC-DS>Blank. Notably, the HC derived from banana peel (BP) exhibited superior performance. The addition of 1 g/L HC derived from BP and its R-HC enabled the complete reduction of 50 mg/L nitrate within 40 and 48 h, respectively. However, residual nitrate remained as high as 12.47 and 23.48 mg/L for its HC-DS and Blank experiments, even after 60 h. Mechanistic analysis revealed that HC could modulate the intracellular electron transfer (IET) during denitrification. Specifically, HC enhanced the supply and accelerated the transfer of electron, optimizing the Embden-Meyerhof pathway (EMP), the tricarboxylic acid (TCA) cycle and the pentose phosphate pathway (PPP), exerting a direct reinforcing effect on intracellular nitrogen metabolism. Simultaneously, HC also enhanced the extracellular electron transfer (EET) through increasing the production of electroactive substances including type IV pilus and cytochrome c. In such mechanism, R-HC played a pivotal role in IET and EET, whereas HC-DS played a comparatively less significant role. This study provides insights into HC's role in enhancing denitrification and offers a new strategy to control nitrogen pollution in aquatic ecosystems.

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Bright and tunable emissive monodisperse CsPbI3@Cs4PbI6 nanocomposites via a precise and controllable dissolution−recrystallization method

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Nano research 2023年第1期16卷 1586-1594页

作者： Luyu Cao Bomei Liu Lin Huang Zhi Zhou Chong-Geng Ma Jian Zhang Jing Wang Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China College of Science Hunan Optical Agriculture Engineering Technology Research CenterHunan Agricultural UniversityChangsha 410128China CQUPT-BUL Innovation Institute Chongqing University of Posts and TelecommunicationsChongqing 400065China Engineering Research Center of Electronic Information Materials and Devices(Ministry of Education) Guangxi Key Laboratory of Information MaterialsGuangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China

Nowadays,due to uncontrolled synthesis and lack of more direct and systematic evidences,the photoluminescence origin of“zero-dimensional”Cs4PbI6 remains great controversy and the luminescence cannot be *** we propose a controllable dissolution-recrystallization method to synthesize“emissive”and“non-emissive”Cs4PbI6 nanocrystals(NCs)*** comparing“emissive”and“non-emissive”Cs4PbI6 NCs,it is clearly proved that the visible emission in“emissive”Cs4PbI6 NCs comes from embedded CsPbI3 quantum dots(QDs).It is found for CsPbI3@Cs4PbI6 nanocomposites,methyl acetate(MeAC)and cyclohexane play an important role in dissolution and recrystallization respectively to obtain Cs4PbI6 matrix and CsPbI3 *** from this two-step method,the as-synthesized CsPbI3@Cs4PbI6 nanocomposites with CsPbI3 QDs uniformly distributed in Cs4PbI6 matrix are bright with photoluminescence quantum yield(PLQY)up to 71.4%and exhibit improved stability than CsPbI3 ***,utilizing its formation mechanism,the size of embedded CsPbI3 QDs can be controlled by reasonable designing the“dissolution”process,so that the luminescence of this CsPbI3@Cs4PbI6 nanocomposites can be adjusted in a wide range from green to red(554–630 nm).Our finding not only provides a novel method for synthesizing tunable“emissive”Cs4PbI6 NCs,but also makes clear the photoluminescence origin of“emissive”Cs4PbI6.

关键词： CsPbI3@Cs4PbI6 dissolution-recrystallization nanocomposites tunable emission

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