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Iron–doped bismuth oxybromides as visible-light-responsive Fenton catalysts for the degradation of atrazine in aqueous phases

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Journal of Environmental Sciences 2024年第3期137卷 321-332页

作者： yong-Li Cai Yu-hang Xu Ji-Zun Xiang Zhi-Qiang Zhang Qiu-Xiang he Ya-Feng Li Jian Lü Fujian Provincial Key Laboratory of Soil Environmental health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Pesticides and its degradation products,being well–known residues in soil,have recently been detected in many water bodies as pollutants of emerging concerns,and thus there is a contemporary demand to develop viable and cost–effective techniques for the removal of related organic pollutants in aqueous ***,a visible-light-responsive Fenton system was constructed with iron–doped bismuth oxybromides(Fe–BiOBr)as the *** the advantage of sustainable Fe(Ⅲ)/Fe(Ⅱ)conversion and optimized H_(2)O_(2)utilization,the optimal Fe–BiOBr–2 catalyst showed an excellent atrazine removal efficiency of 97.61%in 120 min,which is superior than the traditional homogeneous Fenton and the majority of heterogeneous processes documented in the *** this photo–Fenton system,hydroxyl(·OH)and superoxide(·O_(2)^(-))radicals were dominant active species contributed to the oxidative degradation of *** to the production of various active radicals,five degradation pathways were proposed based on the identification of intermediates and degradation ***,this work not only demonstrates a fundamental insight into creating highly efficient and atom economic photo-Fenton systems,but also provides a complementary strategy for the treatment of organic pollutants in water.

关键词： Bismuth oxybromide Photo–Fenton Atrazine Catalytic degradation

EFFECT OF RESTRAINT STRENGTheNING OF VACUUM-PRESSURED BRAZED JOINT

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中国有色金属学会会刊：英文版 1997年第3期7卷 91-94页

作者： Wang, Zhongping he, yong he, Yunjia Northwestern Polytechnical Univ Xi'an China

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关键词： Al Li alloys containing cerium vacuum pressured brazing restraint strengthening

Effect of VIATORR stent in early ultrasound evaluation after transjugular intrahepatic portosystemic shunt(TIPS): A case report

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Journal of Interventional Medicine 2020年第2期3卷 106-108页

作者： heng Du yong Yao Suyu he Lei Feng hang Wu Department of Gastroenterology Suining Central HospitalSuining629000China Department of Ultrasonography Suining Central HospitalSuining629000China

Shunt dysfunction is a major complication of transjugular intrahepatic portosystemic shunt(TIPS). Ultrasonography is a preferred method of shunt follow-up after TIPS, but some misjudgments can occur in cases of shunt dysfunction due to peculiarities of the VIATORR stent. here we report one case and suggest that the first ultrasound evaluation for patients who received TIPS procedure with VIATORR stent should be performed one month after the procedure.

关键词： Ultrasonography Doppler Color Portosystemic shunt Transjugular intrahepatic VIATORR stent Case report

Squeeze flow of interstitial herschel-Bulkley fluid between two rigid spheres

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Particuology 2010年第4期8卷 360-364页

作者： Chunhui Xu Li Yuan yong Xu Wenbin hang College of Science China Agricultural University Beijing 100083 China

Interaction between two spheres with an interstitial fluid is crucial in discrete element modeling for simulating the behaviors of ＇wet＇ particulate materials. The normal viscous force of squeeze flow between two arbitrary rigid spheres with an interstitial herscheI-Bulkley fluid was studied on the basis of Reynolds＇ lubrication theory, resulting in analytical integral expressions of pressure distribution and the viscous force between the two spheres. According to the variation of shear stress, the fluid was divided into yielding and unyielding regions, followed by a discussion on the thickness of the two regions. The result of this paper could be reduced to either the power-law fluid or the Bingham fluid case.

关键词： Wet granuleDiscrete element method herschel-Bulldey fluid Viscous force

Is the East Asian flora ancient or not?

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National Science Review 2018年第6期5卷 920-932页

作者： yong-Sheng Chen Tao Deng Zhuo Zhou hang Sun Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences College of Life Science Northeast Agricultural University University of Chinese Academy of Sciences

The East Asian flora(EAF) is a key biodiversity hotspot for understanding the origin and evolution of Northern hemisphere floras, but there is an ongoing debate on whether it is a museum or a cradle for seed plants. Within the EAF, two main floras, the Sino-Himalayan Flora(mainly the Rhododendron Flora) and the Sino-Japanese Flora(mainly the Metasequoia Flora), have been recognized. Previous studies suggested that the EAF is ancient and the Metasequoia Flora is older than the Rhododendron Flora. To test this hypothesis, we synthesized molecular as well as fossil data on seed plants, focusing on the biogeographical origins and historical evolution of the EAF. We compared the ages of its two constituent floras, and examined the impact of the Asian monsoon and other environmental changes on the development of EAF through meta-analysis. Our results suggest that the EAF might be relatively young, with most of its clades originating since the Miocene. The Rhododendron Flora and the Metasequoia Flora are probably of a similar age. The formation and development of the Asian monsoon might have been the main factors that have driven the evolution of EAF. In the Rhododendron Flora, the north-south mountain chains increased the concentration of species and reduced extinction, and the barriers between the east and west have resulted in species differentiation, which triggered it to become a diversity center. The EAF appears to have multiple biogeographical origins, having closely affiliated not only with other floras in the Northern hemisphere, but also with Gondwanan floras.

关键词： Asian monsoon East Asian Flora Metasequoia Flora Rhododendron Flora temporal and spatial evolution

Capacitor Voltage Imbalance Mechanism and Balancing Control of MMC When Riding Through PTG Fault

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 778-785页

作者： Zhen he Maozeng Lu Lijun hang Pingliang Zeng Yanhua Liu hangzhou Dianzi University Hangzhou 310018China Shandong University of Technology Zibo 255000China State Grid hangzhou Power Supply Company State GridHangzhou 310000China

Modular multilevel converter (MMC) based fault ride through (FRT) control is a promising solution to deal with the pole-to-ground (PTG) fault in high voltage direct current (HVDC) system. However, when MMC switches to the FRT control, capacitor voltage imbalance between upper and lower arms will occur, resulting in the deterioration of FRT performance. This letter provides a comprehensive analysis for the imbalance issue from the perspective of fundamental frequency circulating current (FFCC). It is found the imbalance during FRT stage will not expand continuously, but converge to a certain value gradually. The specific imbalance degree is closely associated with the amplitude of FFCC. In order to solve the imbalance issue, an open-loop balancing control is proposed. By introducing a fundamental frequency feedforward item to the inherent circulating current control, the proposed method can not only balance the capacitor voltages, but also minimize the amplitude of FFCC, and consequently the power loss of MMC during FRT process can be reduced. Finally, simulation results of PSCAD/ EMTDC verify the validity of theoretical analysis.

关键词： Balancing control capacitor voltage imbalance FFCC FRT control HVDC system PTG fault

Multistimuli Responsive and Thermoregulated Capability of Coaxial Electrospun Membranes with Core-sheath Structure and Functional Polypyrrole Layer

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Chinese Journal of Polymer Science 2022年第11期40卷 1380-1388页

作者： Meng-hang Gao Wen Feng Xiao-Dong Qi yong Wang Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science&EngineeringSouthwest Jiaotong UniversityChengdu610031China

Developing thermal management fabrics with good energy storage and multistimuli responsive properties is important for regulating the body temperature in complex ***,the intelligent nonwoven membranes were fabricated via a coaxial electrospinning method,resulting in a core-sheath structure with poly(ethylene glycol)(PEG)as core and polyurethane(PU)as ***,polypyrrole(PPy)with good light absorption ability and electrical conductivity was deposited onto the surface of the PU@PEG electrospun fibers via electrochemical *** PPy layer enabled the membranes to respond quickly to sunlight and electrical *** membranes could heat up to 86°C under simulated sunlight within 200 s or produce remarkable electrothermal effect under a low voltage input of only 1V,exhibiting efficient energy conversion and storage *** photothermal and electrothermal conversion effect could be easily adjusted by controlling the polymerization time of ***,the multifunctional membranes with high latent heat,good mechanical properties as well as excellent photothermal/electrothermal conversion ability are promising in personal thermal management applications.

关键词： Phase change materials Polypyrrole Coaxial electrospinning Photothermal conversion Electrothermal conversion

Allele-specific DNA methylation analyses associated with siRNAs in Arabidopsis hybrids

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Science China(Life Sciences) 2014年第5期57卷 519-525页

作者： CheN ShaoXia he hang DENG XingWang State Key Laboratory of Protein and Plant Gene Research School of Life SciencesPeking University Department of Molecular Cellular and Developmental BiologyYale University

Accumulating evidence has suggested that epigenetic marks including DNA methylation,small RNA and histone modification may involve hybrid vigor in ***,knowledge about how epigenetic marks in hybrids regulate gene expression is still *** on genome-wide DNA methylation landscapes of Arabidopsis thaliana Ler and C24 ecotypes and their reciprocal F1 hybrids which were obtained in our previous work,we analyzed allele-specific DNA methylation and distinguished cis-and trans-regulated DNA methylation in *** study indicated that both cis-and trans-regulated DNA methylation played roles in hybrids,when cis-regulation played a major role in CG methylation and trans-regulation played major roles in CHG and CHH *** addition,we observed correlations between trans-regulated DNA methylation and siRNA *** siRNA regions were significantly concurrent with highly trans-regulated DNA methylation *** results illustrated DNA methylation regulation patterns integrated with siRNAs in Arabidopsis hybrids,and shed light on understanding the mechanism of epigenetic reprogramming for hybrid vigor.

关键词： SNP DNA methylation siRNA cis- trans- allele

Polycyclic aromatic hydrocarbons (PAHs) in a sediment core from Lake Taihu and their associations with sedimentary organic matter

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Journal of Environmental Sciences 2023年第7期129卷 79-89页

作者： yong he Xiangyu Wang Zhaobin Zhang College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

Sediment core is the recorder of polycyclic aromatic hydrocarbon(PAH)pollutions and the associated sedimentary organic matter(SOM),acting as crucial supports for pollution control and environmental ***,the sedimentary records of PAHs and SOM in the past century in Lake Taihu,China,were reconstructed from a 50-cm sediment *** the one hand,the presence of PAHs ranged from 8.99 to 199.2 ng/***,PAHs declined with the depth increased,and the sedimentation history of PAHswas divided into two stages with a discontinuity at 20 cm *** composition,PAHs in the sediment core were dominated by three-ring PAHs(44.6%±9.1%,mean±standard deviation),and were followed by four-ring(27.0%±3.3%),and five-ring(12.1%±4.0%)*** toxicity assessment,the sedimentary records of benzo[a]pyrene-based toxic equivalency were well described by an exponential model with R-square of 0.95,and the environmental background toxic value was identified as 1.62 ng/*** the other hand,different components of SOM were successfully identified by n-alkanemarkers(phe variations of SOMwerewell explained(84.6%).A discontinuity of SOM was recognized at 22 cm *** study showed that the sedimentary PAHs were associated with both anthropogenic and biogenic SOM(phe vertical distributions of PAHs were driven by sedimentary ***,environmental processes such as biogenic factors should attract more attentions as well as PAH emissions to reduce the impacts of PAHs.

关键词： Polycyclic aromatic hydrocarbons (PAHs) N-alkanes Sedimentary records Composition Toxicity assessment Lake Taihu