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Interaction of magnetic spheres in magnetic fields from the view of magnetic energy density:A 3D finite element analysis(FEA)

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International Journal of Mining Science and Technology 2022年第6期32卷 1341-1350页

作者： Jiangang Ku Zhongyun Lei Hua Lin Quanxiang Yan huihuang chen Bao Guo Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350116China State Key Laboratory of Mineral Processing Beijing 100160China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Magnetic interaction between magnetic particles is of great significance in the fields of magnetic separation and functional materials.A good understanding of interaction mechanism of magnetic particles would further boost its promising industrial *** hereby present our work which visualizes the movement behavior of magnetic spheres in magnetic fields employing high-speed imaging and simulates the dynamic behavior of spheres using an Arbitrary Lagrangian-Eulerian(ALE)based on finite element *** this paper,we investigated the stress tensor,magnetic force,and dynamic behavior of magnetic spheres in magnetic fields,especially magnetic energy density in different *** show that there are four relatively independent regions of magnetic energy density distribution in external spatial domains of a single sphere *** force will generate when the energy density in the spatial region between two spheres is relatively high,while a repulsive force will generate when the energy density in the spatial region between two spheres is relatively *** magnetic sphere spontaneously moves towards the region with high energy density and stays away from the region with low energy *** total magnetic energy in magnetic spheres’domains(V_(1))and external spatial domains(V_(2))increases,but the magnetic energy in the external spatial domain decreases over time during the aggregation *** magnetic spheres ultimately arrange in chain-like structures oriented along magnetic field *** hereby proposed a novel and efficient approach to predict the movement trends and final state of magnetic particle swarm from the view of energy density.

关键词： Magnetic force Stress tensor Magnetic spheres Interaction 3D FEA

Improved dark ambient degradation of organic pollutants by cerium strontium cobalt perovskite

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Journal of Environmental Sciences 2020年第4期32卷 110-118页

作者： huihuang chen Julius Motuzas Wayde Martens Joao C.Diniz da Costa The University of Queensland FIM^2 Lab-Functional Interfacial Materials and Membranes LaboratorySchool of Chemical EngineeringBrisbaneQld 4072Australia Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaAnhui 230026China Science and Engineering Faculty Queensland University of TechnologyBrisbaneQld 4000Australia LAQV-REQUIMTE (Bio)Chemical Process EngineeringDepartment of ChemistryFaculty of Science and TechnologyUniversidade NOVA de LisboaCaparica 2829-516Portugal

This work investigates the effect of cerium substation into strontium cobalt perovskites(CeSrCoO)for the oxidative degradation of OrangeⅡ(OII)in dark ambient conditions without the aid of any external stimulants such as light,heating or chemical *** OII degradation rate by CeSrCoO reached 65%in the first hour,whilst for the blank sample without cerium(SrCoO)took over 2 hr to reach the same level of OII ***,the cerium substitution improved the catalytic activity of the perovskite material,mainly associated with the Ce0.1Sr0.9CoO3 perovskite *** contacting CeSrCoO,the-N=Nazo bonds of the OII molecules broke down resulting in electron donation and the formation of *** electrons are injected into the CeSrCoO and resulted in a redox pair of Co3+/Co2+,establishing a bridge for the electron transfer between OII and the ***,the electrons also formed reactive species(·OH)responsible for OII degradation as evidenced by radical trapping *** species were formed via the reaction between 02 and donated electrons from OII with the aid of cobalt redox *** the prepared materials dispensed with the need for light irradiation and additional oxidants,it opens a window of environmental applications for treating contaminated wastewaters.

关键词： Dark catalysis Acid orange degradation Cerium substituted perovskite Catalytic activity

Developing nutrient criteria for the Jiulong River Estuary,Southeast China

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Acta Oceanologica Sinica 2018年第2期37卷 1-13页

作者： LIU Baoli CAO Wenzhi HUANG Zheng chen Wenhui chen huihuang LIU Lusan State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361102 China College of the Environment and Ecology Xiamen University Xiamen 361102 China College of Geographical Sciences Fujian Normal University Fuzhou 350007 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

One of the key concerns in estuarine and coastal environments is eutrophication, which is known to be closely connected to nutrient enrichment. To control and improve surface water quality, nutrient criteria are recommended in order to provide reference conditions for the environment. However, the current datasets of nutrient criteria in China are either designed for surface water or sea water, and as such these are not suitable for assessing estuarine water quality, especially given the unique ecosystem and dynamic properties of estuaries. To address this issue in current estuarine water management, nutrient criteria have been developed for a local estuary in the southeast of China. Segmentation of the Jiulong River Estuary, China was firstly analysed through field investigations carried out during 2013–2014, which resulted in the delineation of three segments characterized by their distinct properties in relation to salinity, hydrology, ecosystems, etc. Historical records from 1997 to 2014 were then analysed using statistical modelling to develop candidate nutrient criteria for the *** stage of the analysis was undertaken in combination with the study of nutrient status records from the 1980s,which were used to establish a baseline reference condition. The recommended criteria values of dissolved inorganic nitrogen（DIN） in Segments Ⅰ, Ⅱ and Ⅲ of the Jiulong River Estuary are 64, 21 and 14 μmol/L,respectively, and the corresponding values for soluble reactive phosphorus（SRP） are 0.89, 0.76 and 0.89 μmol/L,respectively. It should be emphasised that these values are site-dependent, and that different results may be achieved at other locations depending on the physical and biogeochemical characteristics of an estuary, or even a single site within a catchment. It is hoped that by demonstrating a possible methodological approach and methods of nutrient criteria derivation in the Jiulong River Estuary, the current study will offer researchers some fundamental ba

关键词： estuarine segmentation nutrient criteria ecosystems based approach

Structural and functional variations of phytoplankton communities in the face of multiple disturbances

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Journal of Environmental Sciences 2021年第2期33卷 287-297页

作者： Jun R.Yang Xiaoqing Yu huihuang chen Yi-Ming Kuo Jun Yang Engineering Research Center of Ecology and Agricultural Use of wetland(Ministry of Education)College of Agriculture Yangtze UniversityJingzhou 434025China Aquatic Ecohealth Group Fujian Key Laboratory of Watershed EcologyKey Laboratory of Urban Environment and HealthInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China School of Environmental Studies China University of GeosciencesWuhan 430074China

The global decline of freshwater biodiversity caused by climate change and human activities are supposed to disrupt ecosystem services related to water quality and alter the structure and function of aquatic communities across space and time,yet the effects of the combination of these factors on plankton community ecosystem has received relatively little *** study aimed to explore the impacts of disturbances(*** activity,temperature,precipitation,and water level)on phytoplankton community structure(*** evenness and community composition)and function(*** use efficiency)in four subtropical reservoirs over 7 years from 2010 to *** results showed that community turnover(measured as community dissimilarity)was positively related to disturbance frequency,but no significant correlation was found between phytoplankton biodiversity(***)and disturbance *** resource use efficiency(RUE=phytoplankton biomass/total phosphorus)was increased with a higher frequency of disturbance with an exception of *** RUE of Cyanobacteria and diatoms showed significantly negative correlations with their community evenness,while the RUE of Chlorophyta exhibited a positive correlation with their community *** suggest that multiple environmental disturbances may play crucial roles in shaping the structure and functioning of plankton communities in subtropical reservoirs,and mechanism of this process can provide key information for freshwater uses,management and conservation.

关键词： Algae Biodiversity Community ecology Plankton Resource use efficiency Subtropical reservoir

Effect of unstable resonator stability on laser beam quality

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Optoelectronics Letters 2024年第9期20卷 523-530页

作者： LIANG Xiaolin BAO Ben'gang ZHOU Songqing chen huihuang College of Intelligent Manufacturing Hunan University of Science and EngineeringYongzhou 425199China

In order to explore the effect of unstable resonator stability on laser beam quality,the numerical simulation of midinfrared laser and visible laser was carried out in GLAD *** simulation results showed that the existence of defocus aberration,tilt aberration and astigmatic aberration in the unstable resonator can cause the center of the far-field spot of the output annular beam to drift,the number of peripheral diffraction rings to increase,the beam quality to deteriorate,and the degree of effect is different.

关键词： resonator laser beam

Distinct functions of TiR1 and AFB1 receptors in auxin signaling

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Molecular Plant 2023年第7期16卷 1117-1119页

作者： huihuang chen Lanxin Li Minxia Zou Linlin Qi Jiri Friml Institute of Science and Technology Austria(ISTA) 3400 KlosterneuburgAustria Beijing Key Laboratory of Development and Qualty Control of Ornamental Crops Department of Ornamental HorticultureCollege of HorticultureChina AgriculturalUniversity100193BeijingChin

Dear Editor,Auxin is the major plant hormone regulating growth and development(Friml,2022).Forward genetic approaches have identified major components of auxin signaling and established the canonical mechanism mediating transcriptional and thus developmental reprogramming in Arabidopsis *** this textbook view,TRANSPORT INHIBITOR RESPONSE 1(TIR1)/AUXIN-SIGNALING F-BOX(AFB)proteins are auxin receptors,which act as F-box subunits determining the substrate specificity of the Skp1-Cullin1-F box protein(SCF)type E3 ubiquitin ligase *** acts as a"molecular glue,"increasing the affinity between TIR1/AFBs and the Auxin/lndole-3-Acetic Acid(Aux/IAA)***,Aux/IAAs are ubiquitinated and degraded,thus releasing auxin transcription factors from their repression and making them free to mediate transcription of auxin response genes(Yu et al.,2022).

关键词： TIR1 complex media

Urbanization reduces resource use efficiency of phytoplankton community by altering the environment and decreasing biodiversity

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Journal of Environmental Sciences 2022年第2期34卷 140-151页

作者： Yigang Yang huihuang chen Mamun Abdullah Al Jean Claude Ndayishimiye Jun R Yang Alain Isabwe Anqi Luo Jun Yang Aquatic EcoHealth Group Fujian Key Laboratory of Watershed EcologyKey Laboratory of Urban Environment and HealthInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Engineering Research Center of Ecology and Agricultural Use of Wetland(Ministry of Education) College of AgricultureYangtze UniversityJingzhou 434025China

Urbanization often exerts multiple effects on aquatic and terrestrial organisms,including changes in biodiversity,species composition and ecosystem ***,the impacts of urbanization on river phytoplankton in subtropical urbanizing watersheds remain largely ***,we explored the effects of urbanization on phytoplankton community structure(i.e.,biomass,community composition and diversity)and function(i.e.,resource use efficiency)in a subtropical river at watershed scale in southeast China over 6 years.A total of 318 phytoplankton species belonging into 120 genera and 7 phyla were identified from 108 *** biomass showed an increasing trend with increasing urbanization *** phytoplankton community shifted from Chlorophyta dominance in rural upstream waters to Bacillariophyta dominance in urbanized downstream ***,phytoplankton diversity and resource use efficiency(RUE=phytoplankton biomass/total phosphorus)were significantly decreased with increasing urbanization level from upstream to *** RUE exhibited a significant positive correlation with species richness,but a negative correlation with phytoplankton *** variation in environmental factors(turbidity,total nitrogen,NH_(4)^(+)-N,total phosphorus,PO_(4)^(3-)-P and percentage urbanized area)was significantly correlated with phytoplankton diversity and ***,our results revealed the influence of urbanization on phytoplankton community structure and ecosystem function was due to its altering the environmental ***,human-driven urbanization may play crucial roles in shaping the structure and function of phytoplankton communities in subtropical rivers,and the mechanism of this process can provide important information for freshwater sustainable uses,watershed management and conservation.

关键词： Plankton Community functioning Subtropical river Urbanization gradient Land use Watershed ecology

Thermal catalysis under dark ambient conditions in environmental remediation:Fundamental principles, development, and challenges

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Chinese Journal of Catalysis 2019年第8期40卷 1117-1134页

作者： huihuang chen Jiangang Ku Lianzhou Wang University of Science and Technology of China Hefei National Laboratory for Physical Sciences at the Microscale Hefei 230026 Anhui China School of Zijin Mining Fuzhou University Fuzhou 350108 Fujian China The University of Queensland School of Chemical Engineering Brisbane Qld 4072 Australia

Thermal catalytic degradation of organic pollutants conducted in the dark at room temperature under atmospheric pressure without the need of external chemicals and energy sources has attracted a lot of attention over the last two decades. It provides unparalleled advantages over other advanced oxidation processes (AOPs) in treating domestic and industrial contaminated wastewater from the viewpoint of energy/chemical conservation and ease of operation. Rich knowledge has been accumulated in terms of the synthesis and application of thermal catalysts though controversies remain regarding their underlying mechanisms. This review sheds light on the proposed thermo- catalysis mechanism for the first time and presents the development of thermal catalysts under dark ambient conditions with a focus on catalyst materials, catalytic activity, and mechanism. The present review aims to provide mechanistic insights into the rational design of novel and efficient catalysts, and their underlying mechanisms as well as the emerging challenges and perspectives in thermo-catalysis under dark ambient conditions used for the practical and efficient treatment of contaminated wastewater.

关键词： Thermal catalysis under dark ambient conditions Mechanisms Advanced oxidation processes Wastewater treatment Organic pollutant degradation

Directing in-situ self-optimization of single-atom catalysts for improved oxygen evolution

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Journal of Energy Chemistry 2023年第5期80卷 284-290,I0007页

作者： Peiyu Ma chen Feng huihuang chen Jiawei Xue Xinlong Ma Heng Cao Dongdi Wang Ming Zuo Ruyang Wang Xilan Ding Shiming Zhou Zhirong Zhang Jie Zeng Jun Bao Hefei National Research Center for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of SciencesKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei230026AnhuiChina National Synchrotron Radiation Laboratory iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026AnhuiChina

The demand for clean and sustainable energy has encouraged the production of hydrogen from water *** overcome the obstacle to improving the efficiency of water electrolyzers,it is highly desired to fabricate active electrocatalysts for the sluggish oxygen evolution ***,there is generally an intrinsic gap between the as-prepared and real electrocatalysts due to structure evolution under the oxidative reaction ***,we combine in-situ anionic leaching and atomic deposition to realize single-atom catalysts with self-optimized *** introduced F ions facilitate structural transformation from Co(OH)xF into CoOOH(F),which generates an amorphous edge surface to provide more anchoring sites for Ir single ***,the in-situ anionic leaching of F ions elevates the Co valence state of Ir_(1)/CoOOH(F)more significantly than the counterpart without F ions(Ir_(1)/CoOOH),leading to stronger adsorption of oxygenated *** revealed by electrochemical measurements,the increased Ir loading together with the favored adsorption of*OH intermediates improve the catalytic activity of Ir_(1)/CoOOH(F).Specifically,Ir_(1)/CoOOH(F)delivered a current density of 10 mA cm-2at an overpotential of 238 mV,being lower than 314 mV for Ir_(1)/*** results demonstrated the facility of the in-situ optimization process to optimize catalyst structure for improved performance.

关键词： Electrocatalysis Single-Atom Catalysis Self-Optimization Oxygen Evolution