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Experimental Study on the Change Rule of Typical Defective Discharge Characteristics of Transformer Oil Paper Under the Action of Oil Flow Fiber Impurity Particles

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IEEE Access 2025年 13卷 35829-35836页

作者： Du, Jing Wang, Lingyi Chen, Xinrong Chen, Kun Chen, Xu Zhang, Guozhi Hubei University of Technology Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Wuhan430068 China

This paper addresses the issue of fiber impurity particle movement and accumulation on the surface of the electrode at the outlet of the converter transformer during long-term operation, which leads to changes in various local discharge characteristics and mechanisms in the insulating oil. An oil flow device experimental platform was constructed to study the discharge characteristics of fiber impurity particles under different particle concentrations, electrode spacings, and insulating medium conditions. The study found that: 1) The higher the concentration of fiber impurities in the contaminated insulating oil, the easier it is for a complete "impurity bridge"to form between the electrodes. At the same time, the discharge quantity associated with the accumulation of impurities also increases. 2) When the concentration of fiber impurities in the contaminated insulating oil is fixed, as the electrode spacing increases, the number of continuous "fiber impurity bridges"formed between the electrodes decreases sharply, while the discharge quantity increases dramatically. As the thickness of the insulating paperboard increases, the accumulation of fiber impurity particles is reduced, and the discharge signal gradually strengthens. © 2013 IEEE.

关键词： Oil filled transformers

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Boosting Photocatalytic Performance of Cu-Mn Co-doped CeO_(2) Nanoparticles for Tetracycline Degradation

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Journal of Wuhan University of technology(Materials Science) 2025年第1期40卷 42-48页

作者： XU Rongqi MI Jianxin WANG Shulin XU Man ZHU Li BAI Lei TANG Dandan LEI Yu Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd.Xi’an 710100China

Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading *** and TEM results showed that Cu and Mn were successfully co-doped into CeO_(2) without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer ***,the optimized Cu3Mn2CeO_(2) nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.

关键词： photocatalyst co-doped charge separation water treatment

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Electronic Voltage Transformer Metering Error Prediction Model Based on VMD and Correction Model

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International Energy Journal 2025年第1期25卷 1-12页

作者： Li, Zhenhua Cui, Jiuxi Li, Zhenxing Mao, Yedong Xiao, Yanfeng Xiao, Yijun College of Electrical Engineering & New Energy Three Gorges University Hubei443002 China Provincial Engineering Research Center of Intelligent Energy Technology Three Gorges University Hubei443002 China Hubei Technology Innovation Center for Smart Hydropower Hubei430000 China China Yangtze Power Co. Ltd. Hubei443002 China

The deployment of Electronic Voltage Transformers (EVTs) within ultra-high voltage smart grids exceeding 110kV is progressively expanding, rendering their operational stability paramount for precisely acquiring voltage signals across power grids. This paper proposes a dual-stage metering error prediction model for EVTs, which integrates Variational Mode Decomposition (VMD) with a Convolutional Neural Network-Bidirectional Gated Recurrent Unit-Attention Mechanism (CNN-BiGRU-AM). Initially, an optimization algorithm is applied to determine the optimal decomposition parameters in the variational mode. Non-stationary and stochastic raw ratio error sequences are then decomposed into different modal components through VMD. Subsequently, each component is modeled with a predictive framework incorporating BiGRU and an Attention Mechanism to obtain error deviation data based on the first stage's predicted ratio error results. Next, highly correlated features with EVT metering errors are identified using a random forest algorithm to construct a feature set. These features, combined with the error deviation obtained from the first stage, are used as joint inputs to establish an error correction process (second stage), resulting in the final prediction value. Empirical analysis indicates that the proposed method improves prediction accuracy and stability. © 2025 Regional Energy Resources Information Center (RERIC), Asian Institute of technology. All rights reserved.

关键词： Convolutional neural networks

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Equivalent combined cycle modelling for three-heat-reservoir thermal Brownian heat pump with heat-transfer effect and its optimal performance

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Science China(Technological Sciences) 2025年第2期68卷 27-39页

作者： Lingen CHEN Congzheng QI Yanlin GE Huijun FENG Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan Institute of TechnologyWuhan 430205China Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

Because of the important role of the absorption heat pump in low-grade thermal energy utilization,this paper extends it to micro domain and performs a finite-time thermodynamic modelling for a three-heat-reservoir(THR)thermal Brownian heat pump with heat transfer effect by using an equivalent combined cycle method,which was applied for macro endoreversible THR heat *** working principle and energy transformation rule are studied,and the coefficient of performance(COP)and heating load are *** a fixed overall thermal conductance of three heat exchangers,the maximal heating load is determined by optimizing thermal conductance distributions among three heat exchangers and barrier height,and the optimal working temperatures are also *** impact of external heat transfer is elucidated to show the difference between this model and a non-equilibrium thermodynamic *** indicate that external heat transfer determines the energy transformation directly,and performance characteristics are closer to reality when external heat transfer is *** heating load has a maximal value about thermal conductance allocation *** half the overall heat exchanger inventory needs to be assigned to the heat exchanger of the heating space for maximal heating *** the cycle is with only heat transfer effect,the net particle numbers are zero,and the cycle fails to pump *** research results are expected to offer an idea for thermodynamic optimization and design of micro THR thermal Brownian heat pump devices.

关键词： three-heat-reservoir heat pump finite-time thermodynamics thermal Brownian motor COP heating load equivalent combined cycle

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Simultaneous Solar-Driven Interfacial Evaporation and Photo-Fenton Oxidation by Semiconducting Metal–Organic Framework From Waste Polyimide

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Energy & Environmental Materials 2025年第2期8卷 246-258页

作者： Lijie Liu Huajian Liu Zifen Fan Jie Liu Xueying Wen Huiyue Wang Yan She Guixin Hu Ran Niu Jiang Gong Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure Hubei Engineering Research Center for Biomaterials and Medical Protective Materials School of Chemistry and Chemical EngineeringHuazhong University of Science and Technology

The integrated technology of interfacial solar steam generation and photo-Fenton oxidation has emerged as a promising way to simultaneously mitigate freshwater scarcity and degrade organic ***,fabricating low-cost,multi-functional evaporators with high water evaporation and catalytic ability still presents a significant ***,we report the functional upcycling of waste polyimide into semiconducting Fe-BTEC and subsequently construct Fe-BTEC-based composite evaporators for simultaneous freshwater production and photo-Fenton degradation of ***,through a two-step solvothermal-solution stirring method,Fe-BTEC nanoparticles with the size of 20-100 nm are massively produced from waste polyimide,with a band gap energy of 2.2 *** composite evaporator based on Fe-BTEC and graphene possesses wide solar-spectrum absorption capacity,high photothermal conversion capacity,rapid delivery of water,and low enthalpy of *** from the merits above,the composite evaporator achieves a high evaporation rate of 2.72kgm-2h-1from tetracycline solution,as well as the photothermal conversion efficiency of 97% when exposed to irradiation of 1 Sun,superior to many *** is more,the evaporator exhibits the tetracycline degradation rate of 99.6% with good recycling stability,ranking as one of the most powerful heterogeneous Fenton *** Multiphysics and density functional theory calculation results prove the synergistic effect of the concentrated heat produced by interfacial solar steam generation and catalytic active sites of Fe-BTEC on promoting H2O2activation to form reactive oxidation *** work not only provides a green strategy for upcycling waste polyimide,but also proposes a new approach to fabricate multi-functional evaporators.

关键词： freshwater production interfacial solar steam generation metal–organic framework photo-Fenton oxidation waste polyimide

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Viscous Flow Activation Energy and Short-Term Aging Resistance of SBS-Modified Asphalt Enhanced by PPA Oil-Grinding Activated MoS_(2)

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Fluid Dynamics & Materials Processing 2025年第2期21卷 387-404页

作者： Shun Chen Yingjie Wang Xingyang He Ying Su Yingyuan Pan Yimin Cao Wentian Wang Chao Yang Bo Jiang Shaolin Zhang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of TechnologyWuhan430068China Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes Ministry of EducationHubei University of TechnologyWuhan430068China China Construction Third Bureau First Engineering Co. Ltd.China

Styrene-butadiene-styrene(SBS)modified asphalt(SA)has long found effective applications in road construction *** combined with fillers,SBS-modified asphalt has demonstrated promising resistance to fatigue cracking caused by temperature fluctuations and *** this study,molybdenum disulfide(MoS_(2))and polyphosphoric acid(PPA)were ground in naphthenic oil(NO)and subjected to mechanical activation to create PPAmodified MoS_(2),referred to as *** blending various ratios of OMS-PPA with SBS-modified asphalt,composite-modified asphalts were successfully developed to enhance their overall *** assess the mechanical characteristics and stability of these modified asphalts,various methods were employed,including penetration factor,flow activation energy,fluorescence microscopy,and dynamic shear ***,the short-term aging performance was evaluated using Fourier transform infrared(FTIR)spectroscopy and nanoindentation *** results revealed a 3.7%decrease in the penetration-temperature coefficient for SAOMS compared to SA,while 1-SA-OMS-PPA showed an even greater reduction of 7.1%.Furthermore,after short-term aging,carboxyl group generation in SA increased by 5.93%,while SA-OMS exhibited a smaller rise of 1.36%,and 1-SA-OMS-PPA saw an increase of just 0.93%.The study also highlighted significant improvements in the hardness of these *** hardness change ratio for SA-OMS decreased by 43.08%,while the ratio for 1-SA-OMS-PPA saw a notable reduction of 65.16% compared to unmodified *** findings suggest that OMS-PPA contributed to improvements in temperature sensitivity,particle dispersibility,and resistance to shortterm aging in *** results hold significant promise for the future development of advanced asphalt-based materials with potential high-value applications in flexible pavements for highways.

关键词： Composite-modified asphalt grinding viscous flow activation energy short-term aging collaborated

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A Hierarchical Approach based Energy Consumption Optimization of Industrial Robots

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IEEE Transactions on Automation Science and engineering 2025年 22卷 15177-15187页

作者： Xiao, Wei Chen, Xubing Fu, Zhongtao Han, Guirong Wuhan Institute of Technology School of Mechanical & Electrical Engineering Wuhan430205 China Hubei Research Center of Intelligent Welding Equipment and Software Engineering Technology Wuhan430205 China

Due to the wide application and low energy efficiency of industrial robots (IRs), energy consumption (EC) optimization techniques for them have attracted increasing attention. At present, the methods for optimizing the EC of IRs are generally simple. Energy saving for IRs through conventional methods is always achieved through optimizing the joint trajectory, which generally requires pre-planning of the joint trajectory and has limited energy efficiency improvement. Besides, it is time and labor consuming. In this paper, a hierarchical EC optimization method for IRs based on inverse kinematics solution and dynamic time-scaling method based on modified particle swarm optimization (DTS-MPSO) is proposed, with the previously established EC prediction model. For the primary EC optimization, inverse kinematics for the joint angles is performed firstly under a given initial operating posture of the IRs, then the set of joint angles with the lowest EC is selected. In the secondary EC optimization process, DTS-MPSO optimization is applied to further minimize the EC of IRs. Verification experiments with an ABB robot were conducted according to the joint angles obtained through inverse kinematics and those after secondary optimization. It is proved that EC is saved by 10.68% and 39.27% by the inverse kinematics and DTS-MPSO method respectively. The single EC for the robot to move from the initial posture to the initial operating posture was reduced by 45.76% in total when it operated under the trajectory after hierarchical optimization. The EC is effectively saved, and the trajectory for minimum EC can be automatically planned with this method. © 2004-2012 IEEE.

关键词： Industrial robots

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A low-cost wide bandgap polymer based on carboxylate substituted thiazole enables efficient organic solar cells with remarkable batch-to-batch reproducibility

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Science China Chemistry 2025年第2期68卷 733-744页

作者： Xiaodong Zhu Yuchen Lei Jianhong Gao Yanjun He Jinsicheng Liu Qian Guo Xiang Gao Liwei Xiong Xunchang Wang Renqiang Yang Zhitian Liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056China

Constructing the low-cost,high-efficiency,and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar ***,we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer,PBTTzE,containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl)donor *** from synergistic electron deficient effects of chlorination and ester group and C=N,as well as the noncovalent interaction of S…O and S…N,PBTTzE exhibits a deep HOMO energy level(−5.59 eV),and a planar skeleton *** combined with the IT-4F acceptor,the polymer(54 kDa)demonstrated a champion PCE of 15.87%,which is the highest value in the IT-4F-based binary devices to ***,PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 *** addition,an alloyed state and complementary absorption can be formed between PM6 and ***,in a ternary device with PBTTzE added to the PM6:BTP-eC9 blend,a top PCE of 18.76%is achieved due to the suppressed energy loss,prolonged exciton diffusion distance,and improved charge *** work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.

关键词： carboxylate substituted thiazole polymer donor low-cost batch-to-batch reproducibility organic solar cells

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Comparison and analysis of dual-stator magnetic field modulation motors with different permanent magnet arrangements

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Progress in Electromagnetics research C 2025年 152卷 143-149页

作者： Jing, Libing Wang, Tao Min, Zeyu Tang, Weizhao College of Electrical Engineering and New Energy Hubei Provincial Engineering Technology Research Center for Microgrid China Three Gorges University Yichang443002 China

The Double Stator Magnetic Field Modulation Motor (DSMFMM) realizes the magnetic field modulation effect and optimizes the torque ripple effect by accurately optimizing the flux line. In order to further explore the influence of permanent magnets (PMs) magnetization model on the performance of DSMFMM, this paper conducts a comparative study on the performance of three motors with radial magnetization, Halbach magnetization, and Spoke magnetization. Firstly, three motor models are designed based on the same outer radius and axial length, and the flux lines of the three motors are analyzed in detail. Secondly, the static and dynamic performances of the three models are compared by finite element analysis (FEA) method. Compared with the conventional radial magnetization structure, the DSMFMM structure with Halbach magnetization and Spoke magnetization improves the output torque and torque density of the motor. © 2025, Electromagnetics Academy. All rights reserved.

关键词： Permanent magnets

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Preparation of Lignin-like Polymers by Dehydrogenation of Lignin Precursors and Structure-activity Relationships of the Resulting Polymers against Live Cancer HepG2 Cells

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BioResources 2025年第2期20卷 2904-2921页

作者： Zhao, Boxuan Li, Zhijian Wang, Zhi Zhao, Yunbo Xie, Yimin Research Institute of Pulp & Paper Engineering Hubei University of Technology Wuhan430068 China No.100 Xianggang Road Wuhan430000 China Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of Technology Wuhan430068 China

Lignin can be used as a natural anticancer drug because of its potential biological activity and low cytotoxicity. This research focuses on oligomeric dehydrogenation polymers (DHPs) of lignin. The lignin precursor coniferin was used to yield Zulaufverfahren dehydrogenation polymers (ZL-DHPs) and Zutropfverfahren dehydropolymers (ZT-DHPs) catalyzed by mixed enzymes. The13C-NMR determination showed that the DHPs obtained were similar to natural lignin, and ZL-DHP had a slightly higher β-5 content than ZT-DHP. ZL-DHPs and ZT-DHPs were subjected to organic solvent extraction with different polarities to obtain eight fractions, i.e., ZL-1-ZL-4 and ZT-1-ZT-4. The antitumor activity showed ZL-2 (IC50 181.99 μg/mL) and ZT-2 (IC50 246.76 μg/mL) had significant inhibitory effects. Fractions ZL-2 and ZT-2 were purified through column chromatography using gradient-polarity binary eluent, and 12 purified compounds were obtained, i.e., L1–L6 and T1–T6. The results showed L2 (IC50 33.99 μg/mL) and T1 (IC50 42.08 μg/mL) had relatively high biological activity, respectively. Their structure was characterized using high-resolution mass spectrometry and 13 C-NMR, indicating that L2 is a dimer with β-5 linkage (β-5, γ-CH3, and γ'-CH2OH), and T1 is also a dimer with β-5 linkage but different substituents (β-5, γ-CHO, and γ'-COOH). © 2025, North Carolina State University. All rights reserved.

关键词： Column chromatography

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