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Dynamic cooperations between lattice oxygen and oxygen vacancies for photocatalytic ethane dehydrogenation by a self-restoring LaVO_(4)catalyst

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Chinese Chemical Letters 2024年第3期35卷 171-176页

作者： Fen Wei Weichao Xue Zhiyang Yu Xue Feng Lu Sibo Wang Wei lin xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350108China

Thermocatalytic nonoxidative ethane dehydrogenation(EDH)is a promising strategy for ethene production but suffers from intense energy consumption and poor catalyst durability;exploring technology that permits efficient EDH by solar energy remains a giant challenge.Herein,we present that an oxygen vacancy(O_v)-rich LaVO_(4)(LaVO_(4)-O_v)catalyst is highly active and stable for photocatalytic EDH,through a dynamic lattice oxygen(O_(latt.))and O_(v)co-mediated mechanism.Irradiated by simulated sunlight at mild conditions,LaVO_(4)-O_(v)effectively dehydrogenates undiluted ethane to produce C_(2)H_(4)and CO with a conversion of 2.3%.By loading a small amount of Pt cocatalyst,the evolution and selectivity of C_(2)H_(4)are enhanced to 275μmol h^(-1)g^(-1)and 96.8%.Of note,LaVO_(4)-O_(v)appears nearly no carbon deposition after the reaction.The isotope tracked reactions reveal that the consumed O_(latt.)recuperates by exposing the used catalyst with O_(2),thus establishing a dynamic cycle of O_(latt.)and achieving a facile catalyst regeneration to preserve its intrinsic activity.The refreshed LaVO_(4)-O_(v)exhibits superior reusability and delivers a turnover number of about 305.The O_(v)promotes photo absorption,boosts ethane adsorption/activation,and accelerates charge separation/transfer,thus improving the photocatalytic efficiency.The possible photocatalytic EDH mechanism is proposed,considering the key intermediates predicted by density functional theory(DFT)and monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS).

关键词： Photocatalysis Ethane dehydrogenation Ethene LaVO_(4) Oxygen vacancy

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基于可视注意力机制的非锚点行人检测模型

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控制工程 2024年第3期31卷 535-544页

作者：林鑫辰唐漾赵超强钱锋华东理工大学能源化工过程智能制造教育部重点实验室上海200237

在目前的行人检测方法中,中心尺度预测(center-scale prediction,CSP)模型具有检测速度快,无需预设锚点等优点。但是,CSP模型并没有针对行人遮挡问题提出解决方法。为此,在CSP模型的基础上,提出了一个基于可视注意力机制的中心尺度预测(... 详细信息

在目前的行人检测方法中,中心尺度预测(center-scale prediction,CSP)模型具有检测速度快,无需预设锚点等优点。但是,CSP模型并没有针对行人遮挡问题提出解决方法。为此,在CSP模型的基础上,提出了一个基于可视注意力机制的中心尺度预测(visible attentionmechanism-basedCSP,VA-CSP)模型,同时预测行人及其可视区域的边界框,并构造一个中心-可视中心(center-visible center,C-V)变换预测分支,将行人及其可视区域匹配,使模型具有正确的可视注意力机制,提升遮挡行人的检测精度。在Citypersons和Caltech行人检测数据集上进行了实验,在Citypersons验证集的不同遮挡程度的子数据集Reasonable、Heavy、Partial和Bare上,得到了9.6%、48.1%、9.1%和6.6%的丢失率,相比CSP分别提升了1.4%、1.2%、1.3%和0.7%。在Caltech测试集的Reasonable子数据集上得到了3.2%的丢失率,相比CSP提升了1.3%。与其他目前最新的模型相比,所提模型具有更高的检测精度。

关键词：行人检测注意力机制非锚点检测 CSP模型

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Solid-state preparation of mesoporous Ce-Mn-Co ternary mixed oxide nanoparticles for catalytic degradation of methylene blue

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Journal of Rare Earths 2021年第7期39卷 826-834,I0003页

作者： Qingwen Wang Wenyong Deng xinchen lin Xigen Huang ling Wei Lei Gong Changxiang Liu Guangbin Liu Qian Liu Key Laboratory of Chemical Utilization of Plant Resources of Nanchang College of ScienceJiangxi Agricultural UniversityNanchang 330045China

Mesoporous Ce-Mn-Co ternary metal oxide was fabricated via an efficient oxalate-precursor-based soft reactive grinding route and used to activate H_(2)O_(2) for advanced oxidation of methylene blue in water.In addition,Mn-Co binary oxide and pure Co_(3)O_(4) and Mn_(3)O_(4) were also synthesized as reference catalysts.These catalysts were characterized by X-ray diffraction,N_(2) adsorption-desorption,H_(2)-temperature programmed reduction,transmission electron microscopy,scanning electron microscopy and X-ray photoelectron spectroscopy.The results demonstrate that part of the Ce and Mn can be incorporated into the lattice of Co_(3)O_(4) and cause severe lattice distortion of the unit cell.Compared with the single or binary system,Ce-Mn-Co ternary metal oxide exhibits the best activity in methylene blue removal and nearly 100% decomposition rate and 84% COD removal rate can be achieved in 12 h,and with degradation rate of 93.5% after three rounds.These results are primarily attributed to the synergistic effect of Ce,Mn and Co,which can promote the formation of more lattice defects,higher specific surface area and smaller particle size.Quenching tests show that hydroxyl radicals(·OH) play more dominant role than superoxide radicals(·O_(2)^(-)).Kinetic studies were studied and the activation energies of all the catalysts were calculated.

关键词： Ce-Mn-Co mixed Oxide Methylene blue Advanced oxidation processes Soft reactive grinding Rare earths

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多波束卫星通信系统中的非线性预编码算法研究

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移动通信 2024年第6期48卷 2-12页

作者：王珂张歆宸林文亮邓中亮北京邮电大学信息与通信工程学院北京100876

非地面网络(3GPP NTN)是5G演进以及6G网络中的重要组成部分,为了增强卫星容量和频谱效率,基于相控阵的密集多波束、同频部署已逐渐成为研究热点。由于波束成形中旁瓣功率泄露随着波束数增加会造成严重波束间叠加干扰,亟需低复杂度多用... 详细信息

非地面网络(3GPP NTN)是5G演进以及6G网络中的重要组成部分,为了增强卫星容量和频谱效率,基于相控阵的密集多波束、同频部署已逐渐成为研究热点。由于波束成形中旁瓣功率泄露随着波束数增加会造成严重波束间叠加干扰,亟需低复杂度多用户干扰消除方案。从预编码技术角度出发,探讨了非线性预编码在卫星通信系统中的应用和优化方法,并通过实际硬件平台测试,验证了在5G NR基带链路中实现该方案的有效性和先进性。

关键词： 3GPP NTN 多波束卫星波束间干扰非线性预编码

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Semi-Hydrogenation of Alkynes by a Tandem Photoredox System Free of Noble Metal

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CCS Chemistry 2022年第8期4卷 2597-2603页

作者： Tao Yuan Shuwen Huan Bingqing Ge Sen lin Meifang Zheng xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116

The selective hydrogenation reactions play a key role in industrial manufacture of fine chemicals,which mainly rely on noble metal catalysts.Herein,a noble-metal-free hybrid photosystem is established,in which boron carbonitride(BCN)and nickel bis-diphosphine complex(NiP)catalyze cooperatively the semi-hydrogenation of alkynes with high efficiency and excellent selectivity(>99%)under mild reaction conditions.

关键词： boron carbonitride nickel bis-diphosphine complex photocatalysis selective hydrogenation alkyne

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Direct visualization of percolating metal-insulator transition in V_(2)O_(3) using scanning microwave impedance microscopy

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 112-118页

作者： Weiyan lin Huanyu Zhang Yoav Kalcheim xinchen Zhou Fubao Yang Yang Shi Yang Feng Yihua Wang Jiping Huang Ivan KSchuller Xiaodong Zhou Jian Shen State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Department of Physics Fudan UniversityShanghai 200433China Department of Physics University of California San DiegoLa Jolla 92093USA Center for Advanced Nanoscience University of California San DiegoLa Jolla 92093USA Key Laboratory of Micro and Nano Photonic Structures(MOE) Fudan UniversityShanghai 200433China Beijing Academy of Quantum Information Science Beijing 100193China Shanghai Research Center for Quantum Sciences Shanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Shanghai Qi Zhi Institute Shanghai 200232China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201203China

Using the extensively studied V_(2)O_(3) as a prototype system, we investigate the role of percolation in metal-insulator transition(MIT). We apply scanning microwave impedance microscopy to directly determine the metallic phase fraction p and relate it to the macroscopic conductance G, which shows a sudden jump when p reaches the percolation threshold. Interestingly, the conductance G exhibits a hysteretic behavior against p, suggesting two different percolating processes upon cooling and warming. Based on our image analysis and model simulation, we ascribe such hysteretic behavior to different domain nucleation and growth processes between cooling and warming, which is likely caused by the decoupled structural and electronic transitions in V_(2)O_(3) during MIT. Our work provides a microscopic view of how the interplay of structural and electronic degrees of freedom affects MIT in strongly correlated systems.

关键词： electronic phase separation metal-insulator transition percolation theory scanning microwave impedance microscopy

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Combination of two multiplex genome-edited soybean varieties enables customization of protein functional properties

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Molecular Plant 2022年第7期15卷 1081-1083页

作者： Mengyan Bai Cuicui Yuan Huaqin Kuang Qian Sun xinchen Hu Luning Cui Wenxin lin Chunyan Peng Peng Yue Shikui Song Zebin Guo Yuefeng Guan College of Life Sciences Fujian Agriculture and Forestry UniversityFuzhouFujian 350002China FAFU-UCR Joint Center for Horticultural Biology and Metabolomics Haixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhou 350002China Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design Innovative Center of Molecular Genetics and EvolutionSchool of Life SciencesGuangzhou UniversityGuangzhou 510006China College of Food Sciences Fujian Agriculture and Forestry UniversityFuzhouFujian 350002China Shofine Seeds Co. Ltd.JiningShandong 272400China College of Resources and Environment Fujian Agriculture and Forestry UniversityFuzhouFujian 350002China

Dear Editor,Soybean(Glycine max)is a major source of plant-based protein for people worldwide,providing a healthy,affordable,and environmentally friendly alternative to animal-based protein(Montgomery,2003).It has been estimated that there are currently over 12000 food products that contain soy protein(Montgomery,2003).Different food applications of soy protein require distinct properties that affect its function and sensory features.For instance,the sensory quality of soymilk is significantly affected by protein emulsibility,whereas tofu quality is determined by protein-gelling ability(Kinsella,1979).

关键词： Montgomery enable soybean

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Effective Removal of Tetracycline by Using Biochar Supported Fe3O4 as a UV-Fenton Catalyst

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Chemical Research in Chinese Universities 2019年第1期35卷 79-84页

作者： YU Xiaodan lin xinchen LI Weiguang FENG Wei School of Environment Harbin Institute of TechnologyHarbin 150090P.R.China Key Labroratory of Songliao Aquatic Environnmento Ministry of Education Jilin Jianzhu UniversityChangchun 130118P.R.China Key Laboratory of Groundwater Resource and Environment Ministry Education College of Environment and ResourcesJilin UniversityChangehun 130021P.R.China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090.P.R.China

Novel Fe3O4-decorate hierarchical porous carbon skeleton derived from maize straw(Fe3O4@MSC)was synthesized by a facile co-precipitation process and a calcination process,which was developed as a UV assisted heterogeneous Fenton-like catalyst.The as-synthesized catalysts were characterized via X-ray powder diffraction(XRD), scanning electron microscope(SEM),transmission electron microscope(TEM),Brunauer-Emmet-Teller(BET)and vibrating sample magnetometer(VSM)at room temperature.The morphology and structure analysis revealed that the as-prepared Fe3O4@MSC retained the original pore morphology of the maize straw material.The non-uniform poly- hedral Fe3O4 grew on the whole surface of the MSC,which reduced the aggragation of Fe3O4 and provided more active sites to strengthen the UV-assisted Fenton-like reaction.As a result,the tetracycline(TC)degradation efficiency after 40 min reaction and total organic carbon(TOC)removal efficiency after 2 h reaction of Fe3O4@MSC catalyzing UV-Fenton system reached 99.2%and 72.1%,respectively,which were more substantial than those of Fe3O4@MSC/H2O2(31.5%and 2%),UV/H2O2 system(68%and 23.4%)and UV/Fe3O4/H2O2(80% and 37.5%).The electron spin resonance(ESR)results showed that the ·OH played an important role in the catalytic reaction.A possible degradation pathway of TC was proposed on the basis of the identified intermediates.Overall,the UV assisted heterogeneous Fenton-like process in Fe3O4@MSC improved the cycle of Fe^3+/Fe^2+ and activated the interfacial catalytic site,which eventually realized the enhancement of degradation and mineralization to tetracycline.

关键词： Fe3O4 Carbon skeleton of maize straw,Heterogeneous Fenton-like catalyst UV irradiation Degradation of tetracycline

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Phosphorene-Based Heterostructured Photocatalysts

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Engineering 2021年第7期7卷 991-1001页

作者： Yun Zheng Yilin Chen Bifen Gao Bizhou lin xinchen Wang Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing College of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China

Semiconductor photocatalysis is a potential pathway to solve the problems of global energy shortage and environmental pollution.Black phosphorus(BP)has been widely used in the field of photocatalysis owing to its features of high hole mobility,adjustable bandgap,and wide optical absorption range.Nevertheless,pristine BP still exhibits unsatisfactory photocatalytic activity due to the low separation efficiency of photoinduced charge carriers.In recent years,the construction of heterostructured photocatalysts based on BP has become a research hotspot in photocatalysis with the remarkable improvement of photoexcited charge-separation efficiency.Herein,progress on the design,synthesis,properties,and applications of BP and its corresponding heterostructured photocatalysts is summarized.Furthermore,the photocatalytic applications of BP-based heterostructured photocatalysts in water splitting,pollutant degradation,carbon dioxide reduction,nitrogen fixation,bacterial disinfection,and organic synthesis are reviewed.Opportunities and challenges for the exploration of advanced BP-based heterostructured photocatalysts are presented.This review will promote the development and applications of BP-based heterostructured photocatalysts in energy conversion and environmental remediation.

关键词： Phosphorene Heterostructure Photocatalysis Water splitting Pollutant degradation

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“枫桥经验”何以诞生

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文化纵横 2023年第6期 149-157,M0004页

作者：林新辰中国人民大学社会与人口学院、社会学理论与方法研究中心

党的二十大报告指出:“在社会基层坚持和发展新时代‘枫桥经验’,完善正确处理新形势下人民内部矛盾机制,加强和改进人民信访工作,畅通和规范群众诉求表达、利益协调、权益保障通道,完善网格化管理、精细化服务、信息化支撑的基层治理平... 详细信息

党的二十大报告指出:“在社会基层坚持和发展新时代‘枫桥经验’,完善正确处理新形势下人民内部矛盾机制,加强和改进人民信访工作,畅通和规范群众诉求表达、利益协调、权益保障通道,完善网格化管理、精细化服务、信息化支撑的基层治理平台,健全城乡社区治理体系,及时把矛盾纠纷化解在基层、化解在萌芽状态。”

关键词：典型治理枫桥经验社会主义教育运动

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