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dynamic Analysis of Uniformity and difference for Grid-following and Grid-forming Voltage Source Converters Using Phasor and Topological Homology Methods

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Journal of Modern Power Systems and Clean Energy 2025年第1期13卷 3-14页

作者： Haiyu Zhao Hongyu Zhou Wei Yao Qihang Zong Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronics EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Grid-following voltage source converter(GFLVSC)and grid-forming voltage source converter(GFM-VSC)have different dynamic characteristics for active power-frequency and reactive power-voltage supports of the power *** paper aims to clarify and recognize the difference between gridfollowing(GFL)and grid-forming(GFM)frequency-voltage support more intuitively and ***,the phasor model considering circuit constraints is established based on the port circuit equations of the *** is revealed that the voltage and active power linearly correspond to the horizontal and vertical axes in the phasor space referenced to the grid voltage ***,based on topological homology,GFL and GFM controls are transformed and mapped into different *** topological similarity of the characteristic curves for GFL and GFM controls is the essential cause of their *** on the above model,it is indicated that GFL-VSC and GFM-VSC possess uniformity with regard to active power response,type of coupling,and phasor *** differ in synchronization,power coupling mechanisms,dynamics,and active power-voltage operation domain in the quasi-steady *** studies are undertaken on GFL-VSC and GFM-VSC integrated into a four-machine two-area *** results verify that the dynamic uniformity and difference of GFL-VSC and GFM-VSC are intuitively and comprehensively revealed.

关键词： renewable energy grid-following converter grid-forming converter phasor method topological homology

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Spatial confinement:An effective strategy to improve H_(2)O and SO_(2) resistance of the expandable graphite-modified TiO_(2)-supported Pt nanocatalysts for CO oxidation

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Journal of Environmental Sciences 2025年第2期148卷 57-68页

作者： Hongtai Zhu Wenge Qiu ruiWu Kai Li Hong He Key Laboratory of Beijing on Regional Air Pollution Control Beijing Key Laboratory for Green Catalysis and SeparationBeijing University of TechnologyBeijing 100124China Advanced E-Catal.Corporation Ltd.Beijing 100025China

The expandable graphite(EG)modified TiO_(2) nanocomposites were prepared by the high shearmethod using the TiO_(2) nanoparticles(NPs)and EG as precursors,in which the amount of EG doped in TiO_(2) was 10 wt.%.Followed by the impregnation method,adjusting the pH of the solution to 10,and using the electrostatic adsorption to achieve spatial confinement,the Pt elementswere mainly distributed on the exposed TiO_(2),thus generating the Pt/10EG-TiO_(2)-10 *** best CO oxidation activity with the excellent resistance to H_(2)O and SO_(2) was obtained over the Pt/10EG-TiO_(2)-10 catalyst:CO conversion after 36 hr of the reaction was ca.85%under the harsh condition of 10 vol.%H_(2)O and 100 ppm SO_(2) at a high gaseous hourly space velocity(GHSV)of 400,000 hr−*** properties of the catalystswere characterized by various *** results showed that the electrostatic adsorption,which riveted the Pt elements mainly on the exposed TiO_(2) of the support surface,reduced the dispersion of Pt NPs on EG and achieved the effective dispersion of Pt NPs,hence significantly improving CO oxidation activity over the Pt/10EG-TiO_(2)-10 *** 10 wt.%EG doped in TiO_(2) caused the TiO_(2) support to form a more hydrophobic surface,which reduced the adsorption of H_(2)O and SO_(2) on the catalyst,greatly inhibited deposition of the TiOSO_(4) and formation of the PtSO4 species as well as suppressed the oxidation of SO_(2),thus resulting in an improvement in the resistance to H_(2)O and SO_(2) of the Pt/10EG-TiO_(2)-10 catalyst.

关键词： Expandable graphite Electrostatic adsorption Titania supported platinum CO oxidation resistance to H_(2)O and SO_(2)

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Ultralight and Anisotropic Heterocyclic Para-aramid Nanofiber/reduced Graphene Oxide Composite Aerogel for Efficient Thermal Insulation and Flame retardancy

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Chinese Journal of Polymer Science 2025年第1期43卷 141-152,I0011页

作者： Wen-Wen Wu Jian-Xun Shang Na Li Yan Wang Jun-rong Yu Zu-Ming Hu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Jiangsu Nantong Junyuan New Material Co Ltd.Nantong 22600China

The demand for anisotropic aerogels with excellent comprehensive properties in cutting-edge fields such as aerospace is *** on the above background,a novel heterocyclic para-aramid nanofiber/reduced graphene oxide(HPAN/rGO)composite aerogel was prepared by combining electrospinning and unidirectional *** anisotropic HPAN/rGO composite aerogel exhibited a honeycomb morphology in the direction perpendicular to the growth of ice crystals,and a through-well structure of directed microchannels in the direction parallel to the temperature *** varying the mass ratio of HPAN/rGO,a composite aerogel with an ultra-low density of 5.34-7.81 mg·cm^(-3) and an ultra-high porosity of 98%-99%was *** from the anisotropic structure,the radial and axial thermal conductivities of HPAN/rGO-3 composite aerogel were 29.37 and 44.35 mW·m^(-1)·K^(-1),respectively.A combination of software simulation and experiments was used to analyze the effect of anisotropic structures on the thermal insulation properties of ***,due to the intrinsic self-extinguishing properties of heterocyclic para-aramid and the protection of the graphene carbon layer,the composite aerogel also exhibits excellent flame retardancy properties,and its total heat release rate(THr)was only 5.8 kJ·g^(-1),which is far superior to many reported ***,ultralight anisotropic HPAN/rGO composite aerogels with excellent high-temperature thermal insulation and flame retardancy properties have broad application prospects in complex environments such as aerospace.

关键词： Heterocyclic para-aramid nanofiber reduced graphene oxide Anisotropy Thermal insulation Flame retardancy

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Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li Yangfei Chen Yang Jiang Xiaofei Guo Han dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(rA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized rA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of rA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

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Simultaneous detection of Carbon dioxide and Its Isotope (δ¹³C) Based on Near Infrared Off-Axis Integrated Cavity Output Spectroscopy

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MICrOWAVE ANd OPTICAL TECHNOLOGY LETTErS 2025年第5期67卷

作者： Liu, Yixuan Gu, Mingsi Liu, Kun Wang, Guishi Mei, Jiaoxu Tan, Tu Chen, Jiajin Gao, Xiaoming Chinese Acad Sci Anhui Inst Opt & Fine Mech Hefei Inst Phys Sci Hefei Peoples R China Univ Sci & Technol China Hefei Peoples R China

Accurate monitoring of atmospheric delta C-13 isotope is critical for quantifying anthropogenic carbon emissions and ecosystem responses within global carbon cycle research. This study used off-axis integrated cavity output spectroscopy (OA-ICOS) combined with distributed feedback (dFB) laser and achieved an effective absorption path length of approximately 22 km, for the simultaneous detection of carbon dioxide and its isotope (delta C-13) under atmospheric background conditions. Laboratory validation demonstrated detection limits of 104.5 ppb, 3.3 ppb, and 0.72 parts per thousand for (CO2)-C-12, (CO2)-C-13, and delta C-13, respectively, with a 2000 s integration time, alongside linear calibration r-2 > 0.999. While Kalman filtering reduced concentration variability by 73.5%-74.7% and improved delta C-13 precision 4.6 times. The sensor's capability to quantify isotopic ratios and molecular concentrations in real-time addresses critical gaps in atmospheric background monitoring, offering a robust tool for climate research and carbon source-sink analysis, expanding the applicability of laser spectroscopy in environmental sensing.

关键词： carbon dioxide OA-ICOS simultaneous detection stable carbon isotope

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Phase-field modelling for degradation/failure research in lithium battery:Progress and prospects

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Journal of Energy Chemistry 2025年第3期102卷 628-650页

作者： Wenhao Wu Ying Lin Yonggang Hu Zhifeng He Yong Yang State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005FujianChina College of Energy Xiamen UniversityXiamen 361005FujianChina Collaborative Innovation Center of Chemistry for Energy Materials(iChEM) Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

degradation of materials is one of the most critical aging mechanisms affecting the performance of lithium *** the various approaches to investigate battery aging,phase-field modelling(PFM)has emerged as a widely used numerical method for simulating the evolution of the phase interface as a function of space and time during material phase transition ***,PFM coupled with multi-physics analyses is particularly well-suited for investigating the mesoscale microstructural evolution of materials,providing quantitative understandings of aging and failure mechanisms in lithium *** this paper,we comprehensively overview the state-of-art applications of PFM in the research of degradation and failure processes in lithium batteries,particularly focusing on the theoretical framework and development of the PFMs for lithium deposition/dissolution,phase separation,and crack ***,we summarize the existing challenges and prospect some future developments in PFMs,aiming to offer new insights into the advancement of PFM and ultimately enhance the development of lithium batteries.

关键词： Lithium battery Aging Numerical simulation Phase field

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A stacking-based model for the spread of Botryosphaeria laricina

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Journal of Forestry research 2025年第1期36卷 427-443页

作者： Hongwei Zhou Shibo Zhang Meng Xie Xiaodong Li Yifan Chen Wenhao dai College of Computer and Control Engineering Northeast Forestry UniversityHarbin 150040People’s Republic of China Key Laboratory of National Forestry and Grassland Administration On Forest and Grassland Pest Monitoring and Warning Center for Biological Disaster Prevention and ControlNational Forestry and Grassland AdministrationShenyang 110034People’s Republic of China

Botryosphaeria laricina(larch shoot blight)was first identified in 1973 in Jilin Province,*** disease spread rapidly and caused considerable damage because its pathogenesis was unknown at the time and there were no effective controls or quarantine *** present,it shows a spreading trend,but most research can only conduct physiological analyses within a relatively short period,combining individual influencing ***,methods such as neural network models,ensemble learning algorithms,and Markov models are used in pest and disease prediction and ***,there may be fitting issues or inherent limitations associated with these *** study obtained *** data at the county level from 2003 to *** dataset was augmented using the SMOTE algorithm,and then algorithms such as XGBoost were used to select the significant features from a combined set of 12 features.A new stacking fusion model has been proposed to predict the status of *** model is based on random forest,gradient boosted decision tree,CatBoost and logistic regression *** accuracy,recall,specificity,precision,F_(1) value and AUC of the model reached 90.9%,91.6%,90.4%,88.8%,90.2%and 96.2%.The results provide evidence of the strong performance and stability of the *** is mainly found in the northeast and this study indicates that it is spreading *** means should be used promptly to prevent further damage and spread.

关键词： Botryosphaeria laricina data augmentation Feature selection Stacking Status of spread

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Thermal-flow-electric coupling performance analysis of a liquid-immersed battery thermal management system

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Science china(Technological Sciences) 2025年第1期68卷 153-172页

作者： Qiang GAO Jun TIAN Chujin BAO Yangfan ZHONG Chengbin ZHANG Yongping CHEN School of Energy and Environment Southeast UniversityNanjing 210096China Battery Testing Center China North Vehicle Research InstituteBeijing 100072China Zhejiang Immertech Co. Ltd.Hangzhou 310000China Alibaba Cloud Computing Co. Ltd.Shenzhen 518100China

Ensuring the safety and performance of lithium-ion batteries(LIBs)is a significant challenge for electric *** tackle this issue,an innovative liquid-immersed battery thermal management system(LIBTMS)using bionic baffles with fish-like perforations is *** thermal-flow-electric coupling characteristics of LIBTMSs with different baffle structures(no baffle,conventional baffle,baffle with circular perforations and baffle with fish-like perforations)are systematically investigated using experimental and numerical *** results indicate that the forced flow scheme exhibits better thermal management performance and voltage equalization than static ***,the LIB temperatures and voltage deviations of different LIBTMSs increase quickly with increasing discharge *** importantly,the innovative LIBTMS exhibits the best thermoelectric performance due to its excellent thermoelectric equilibrium behavior caused by high electrical and temperature consistency,as well as the best overall performance involving the balance between the pressure loss and heat transfer capacity of the *** with other structures,the innovative LIBTMS using baffles with fish-like perforations exhibits a maximum reduction of 10.1%,15.2%,25.8%and 9.0%in LIB maximum temperature,maximum temperature difference,system pressure drop and voltage deviation,respectively,under the same operating ***,for the LIBTMS using baffles with fish-like perforations,the bottom inlet and top outlet configuration and coolant precooling are suggested to enhance cooling performance.

关键词： baffle liquid-immersed thermoelectric performance lithium-ion battery battery thermal management

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Mitigation of hydrogen sulfide production in sewer systems by inhibiting sulfate-reducing bacteria:a review

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Frontiers of Environmental Science & Engineering 2025年第3期19卷 209-227页

作者： Zheng Qi Tipei Jia Wenjie Cong Jinying Xi Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing 100084China

The emission of hydrogen sulfide(H_(2)S)in sewers leads to pipeline corrosion and odor ***-reducing bacteria(SrB)reduce sulfate as the main pathway for H_(2)S production in *** SrB activity through chemical or biological methods is an effective strategy to reduce H_(2)S ***,the objective of this review is to provide a comprehensive summary of research in the reduction of H_(2)S production in sewer systems via inhibition of the metabolic activity of *** study provides an understanding on the complex metabolism of SrB,which is crucial for mitigating H_(2)S generation in sewer *** review addresses H_(2)S production in sewer systems and its reduction methods by inhibiting SrB activity using both chemical and biological ***,the addition of chemicals to sewer systems to control H_(2)S has shown good ***,these methods face challenges such as the need for repeated dosing,short effective durations,bacterial resistance,and increased loads on downstream wastewater treatment *** agents are more environmentally friendly,but research on their application for controlling H_(2)S in sewer systems is limited,and their effectiveness and stability are yet to be *** review analyses the potential of chemical and biological methods,discusses current applications and future research directions based on SrB inhibition mechanisms,and provides insights for developing more efficient and ecofriendly strategies for H_(2)S control in sewer systems.

关键词： Chemical dosing Biological agent Hydrogen sulfide Sewer systems Sulfatereducing bacteria

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revealing the effect of external pressure on solid-electrolyte interphase and lithium plating in lithium-ion batteries

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Journal of Energy Chemistry 2025年第3期102卷 734-744页

作者： rui Xiong Haocheng Li Bing-Ang Mei Hongwen He Weixiang Shen National Engineering Research Center of Electric Vehicles School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 00081China School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthornVictoria 3122Australia

Lithium plating is a detrimental phenomenon in lithium-ion cells that compromises both functionality and *** study investigates electro-chemo-mechanical behaviors of lithium plating in lithium iron phosphate pouch cells under different external *** force microscopy nanoindentation is performed on the graphite electrode to analyze the influence of external pressure on solid-electrolyte interphase(SEI),revealing that the mechanical strength of SEI,indicated by Young's modulus,increases with the presence of external ***,an improved phase field model for lithium plating is developed by incorporating electrochemical parameterization based on nonequilibrium *** results demonstrate that higher pressure promotes lateral lithium deposition,covering a larger area of ***,electrochemical impedance spectroscopy and thickness measurements of the pouch cells are conducted during overcharge,showing that external pressure suppresses gas generation and thus increases the proportion of lithium deposition among galvanostatic overcharge *** integrating experimental results with numerical simulations,it is demonstrated that moderate pressure mitigates SEI damage during lithium plating,while both insufficient and excessive pressure may exacerbate *** study offers new insights into optimizing the design and operation of lithium iron phosphate pouch cells under external pressures.

关键词： Lithium-ion batteries Overcharge Lithium plating Electrochemical mechanics Synergistic effects

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