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Facet-dependent activation of oxalic acid over hematite nanocrystals under the irradiation of visible light for efficient degradation of pollutants

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Journal of Environmental Sciences 2024年第8期142卷 204-214页

作者： Zhixiong Yang Yuan Li Xiaotian wang Jiaming Li jiquan wang Gaoke Zhang Hubei Key Laboratory of Mineral Resources Processing and Environment State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China Hubei Engineering Consulting Co. Ltd.Wuhan 430071China

Naturally occurring hematite has been widely studied in the Fenton-like system for water pollutant remediation due to its abundance and non-toxicity.However,its inadequate catalytic activity results in difficulty in effectively degrading pollutants in the catalytic degradation system that it constitutes.Thus,we constructed a photochemical system composed of hematite with{001}facet of high activity facet and low-cost and non-toxic oxalic acid(OA)for the removal of various types of pollutants.The removal rate for the degradation of metronidazole,tetracycline hydrochloride,Rhodamine B,and hexavalent chromium by hematite nanoplate with the exposed{001}facet activating OA under visible light irradiation was 4.75,2.25,2.33,and 2.74 times than that by the exposed{110}facet,respectively.Density functional theory(DFT)calculation proved that the OA molecule was more easily adsorbed on the{001}facet of hematite than that on the{110}facet,which would favor the formation of the more Fe(Ⅲ)-OA complex and reactive species.In addition,the reactive site of metronidazole for the attraction of radicals was identified on the basis of the DFT calculation on the molecular occupied orbitals,and the possible degradation pathway for metronidazole included carbon chain fracture,hydroxyethyl-cleavage,denitrogenation,and hydroxylation.Thus,this finding may offer a valuable direction in designing an efficient iron-based catalyst based on facet engineering for the improved activity of Fenton-like systems such as OA activation.

关键词： Hematite Facet exposure Oxalic acid activation Fenton-like system Pollutant removal

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Establishment and verification of labor demand estimation model in planting industry

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 86-93页

作者： Xu Bing wang Fulin wang jiquan Zhao Shengxue College of Engineering Northeast Agricultural UniversityHarbin 150030China

In view of the poor precision of the theoretical model of labor demand estimation,it is difficult to estimate and predict the actual production problems accurately.Based on the actual production conditions and the relationship between the degree of mechanization of planting and the demand of labor force,this study established an estimation model for the labor demand of planting industry considering the factors of planting structure and mechanization degree.In order to ensure high reliability of data,the method of checking out abnormal data was adopted to obtain the cultivated land area index when the mechanization degree is from 0 to 100%.Taking Suihua region(Heilongjiang Province,China)as an example,the theory of the research was analyzed and applied.This study accessed to the data of cultivated land area per labor can afford when the mechanization level in Suihua area were 0 and 100%respectively through the investigation,and the average cultivated land area data of each labor force in two cases were sorted out and the abnormal data were eliminated at the same time.Finally,using the derived model,the data obtained and the mechanization level and cultivated land area of Suihua in the future,the labor demand amount in Suihua area from 2015 to 2019 were predicted.The model established in this study can be used to calculate the quantity of both current labor demand in planting industry and the labor demand in the various moments in the future through forecasting the future mechanization level and cultivated area which are the two main factors influencing the quantity of labor demand in planting structure.

关键词： planting industry labor estimation model case verification forecast evaluation

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基于多物理场耦合方法的燃料性能分析模型研究及初步计算

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科学技术创新 2024年第14期 55-59页

作者：王继全中国原子能科学研究院北京

燃料棒是反应堆的核心部件,能够产生能量并包容强放射性物质,对其进行性能分析具有重要意义,传统的性能分析软件难以对复杂工况以及局部效应进行分析。近年来开始基于多物理场耦合平台对燃料性能进行分析。本工作基于COMSOL平台开发了... 详细信息

燃料棒是反应堆的核心部件,能够产生能量并包容强放射性物质,对其进行性能分析具有重要意义,传统的性能分析软件难以对复杂工况以及局部效应进行分析。近年来开始基于多物理场耦合平台对燃料性能进行分析。本工作基于COMSOL平台开发了棒状燃料的三维热-力-辐照耦合分析模型,考虑了芯块、包壳的物性随温度、燃耗等变化的模型以及燃料棒的一系列堆内行为。并以此对以SP-100为基础设计的新型燃料元件进行初步计算,具有一定的参考意义。

关键词：性能分析多物理场三维耦合有限元方法

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基于改进实数遗传算法的桑叶采摘机结构参数优化

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中国农机化学报 2024年第1期45卷 14-20,53页

作者：王吉权宋丽宋豪豪张攀利王福林东北农业大学工程学院哈尔滨市150030

针对遗传算法在求解桑叶采摘机结构优化问题时容易陷入局部最优和求解精度低等问题,提出一种改进实数遗传算法。首先是给出一种基于序的组合适应度函数的轮盘赌选择算子,该算子在轮盘赌的基础上,通过一个自适应变化的参数在两种适应度... 详细信息

针对遗传算法在求解桑叶采摘机结构优化问题时容易陷入局部最优和求解精度低等问题,提出一种改进实数遗传算法。首先是给出一种基于序的组合适应度函数的轮盘赌选择算子,该算子在轮盘赌的基础上,通过一个自适应变化的参数在两种适应度函数中选择一个,再去计算适应度值;然后设计一种基于方向的改进启发式交叉算子,该算子既保留两个父代个体中较优个体对子代个体的影响,又增加种群中最优个体对子代个体的影响,提高交叉产生有潜力子代的可能性。接着将改进算法应用于摇杆式桑叶采摘机的优化参数设计中,通过与其他算法作仿真对比试验验证算法的优越性,获得采摘机最优参数组合:行走结构速度为24 mm/s、拨动结构角速度为1.2 rad/s、采摘结构速度为440 mm/s,并由运行结果可知整机性能与优化前相比提高13%。最后用优化得到的参数组合进行实地试验,结果显示桑叶采摘机性能提升10.9%,误差较小为2.1%。可见,所提改进实数遗传算法是优化采摘机参数的一种有效算法。

关键词：桑叶采摘机结构优化实数遗传算法轮盘赌选择启发式交叉算子

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Adsorption of Rhodamine B from Aqueous Solution onto Heat-Activated Sepiolite

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Wuhan University Journal of Natural Sciences 2013年第3期18卷 219-225页

作者： wang jiquan wang Daojie ZHANG Gaoke GUO Yadan LIU Jin School of Resources and Environmental Engineering Wuhan University of Technology

The heat-activated sepiolite,which was prepared using sepiolite by thermal treatment at different temperatures,was used as an absorbent for the removal of rhodamine B（RhB） from aqueous solutions.The structure and morphology of the as-prepared samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM） techniques,respectively.The adsorption capacity of RhB onto the heat-activated sepiolite has been examined with pH,adsorbent dosage,contact time,initial dye concentration,and temperature.Kinetic studies showed that the equilibrium was attained within 40 min,and the kinetic data were well described by the pseudo-second-order kinetic model.Besides,the experimental data（R 2 〉0.999） fitted the Freundlich model better than the Langmuir model.The as-prepared sample showed higher adsorption capacity（8.33 mg/g） for the removal of RhB than that of sepiolite,which could be attributed to more adsorption sites caused by appropriate heat treatment.The adsorbent can be well regenerated by calcination at 400 ℃ for 2 h and regenerated sepiolite did not exhibited significant loss of adsorption activity after five recycles.

关键词： heat-activated sepiolite adsorption rhodamine B kinetics adsorption isotherms

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MS-G技术调控Nd-Fe-B铸态组织研究

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中国稀土学报 2024年第1期42卷 47-52,I0002页

作者：马斌张鹏杰王继全李青华李炳山孙威矿冶科技集团有限公司北京102600 北矿磁材(阜阳)有限公司安徽阜阳236000

采用熔体快淬+晶体生长(MS-G)技术调控Nd-Fe-B铸态组织,研究了铜辊转速及高温热处理对Nd-Fe-B快淬条带组织结构的影响。铜辊转速25 m·s^(-1)时快淬条带微观晶粒组织均匀,平均晶粒尺寸0.1μm,XRD图谱显示其为Nd_(2)Fe_(14)B相。Nd-Fe-B... 详细信息

采用熔体快淬+晶体生长(MS-G)技术调控Nd-Fe-B铸态组织,研究了铜辊转速及高温热处理对Nd-Fe-B快淬条带组织结构的影响。铜辊转速25 m·s^(-1)时快淬条带微观晶粒组织均匀,平均晶粒尺寸0.1μm,XRD图谱显示其为Nd_(2)Fe_(14)B相。Nd-Fe-B快淬条带经880℃热处理2.0 h晶粒均匀长大,平均尺寸0.86μm;冷却到750℃继续热处理2.0 h晶粒进一步均匀长大,平均尺寸达到1.04μm。温度升高会降低Nd_(2)Fe_(14)B晶粒异常长大临界驱动力Δg_(c),缩短异常长大的孕育期,使异常晶粒提早出现,高温+低温两步热处理通过降温处理来延长晶粒异常长大孕育期,从而促进Nd_(2)Fe_(14)B晶粒在较低温度下继续均匀长大。

关键词：钕铁硼熔体快淬晶体生长两步热处理铸态组织

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大跨径钢-UHPC组合梁桥设计与整体受力分析

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城市道桥与防洪 2024年第4期 71-73,I0005页

作者：王继全刘晓銮上海市政工程设计研究总院(集团)有限公司上海市200092

嘉兴市市区快速路环线工程跨越京杭大运河地面老桥龙凤桥,采用跨径布置为65 m+95 m+65 m的大跨径钢-UHPC连续组合梁方案,该方案在设计、施工和经济性方面都具有较显著的优势.采用Midas Civil 2021软件建立桥梁空间有限元模型,在承载能... 详细信息

嘉兴市市区快速路环线工程跨越京杭大运河地面老桥龙凤桥,采用跨径布置为65 m+95 m+65 m的大跨径钢-UHPC连续组合梁方案,该方案在设计、施工和经济性方面都具有较显著的优势.采用Midas Civil 2021软件建立桥梁空间有限元模型,在承载能力极限状态和正常使用极限状态下各项验算均满足规范要求,可以为类似桥梁设计提供参考.

关键词：超高性能混凝土(UHPC) 组合梁经济性承载力有限元分析

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Promotional effect of silica on the combustion of nano-sized aluminum powder in carbon dioxide

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Chinese Journal of Aeronautics 2022年第4期35卷 245-252页

作者： Baozhong ZHU Jinghui wang Qichang wang Yunlan SUN Weiqi CHEN jiquan wang School of Petroleum Engineering Changzhou UniversityChangzhou 213164China School of Energy and Environment Southeast UniversityNanjing 243002China

This paper presents how the combustion performance of nano-sized aluminum(nAl)powder in carbon dioxide are affected by silica. The ignition and combustion performance of nAl powder with silica addition were studied by a high-temperature tube furnace. An s-type thermocouple and a high-speed motion acquisition instrument were performed to evaluate the ignition temperature, maximum combustion temperature, maximum change of rate of temperature, and combustion propagation speed. The combustion efficiency and combustion products were measured and analyzed by a gas-volumetric method and an X-ray diffraction. The results show that silica added into nAl powder can enhance its maximum combustion temperature and maximum change of rate of temperature, while its ignition temperature increases slightly. The nAl powders with addition of 6.00 wt.% and 12.00 wt.% silica present high combustion propagation speeds, especially for the latter, it has high combustion efficiency. The effect mechanism of silica on the combustion of nAl powder in carbon dioxide was discussed.

关键词： Combustion Mechanism Nano-sized aluminum powder Promotional effect Silica

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铁路领域BIM研究知识图谱构建与分析

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铁道工程学报 2023年第11期40卷 87-93页

作者：王基全山东铁路投资控股集团有限公司济南250000

研究目的:建筑信息模型(Building Information Modeling,BIM)近年来在铁路建筑领域取得越来越广泛的应用,成为该行业赋能的重要技术手段之一。为研判BIM技术在铁路领域的应用现状及发展趋势,以国内外文献为数据源,运用文献计量理论方法... 详细信息

研究目的:建筑信息模型(Building Information Modeling,BIM)近年来在铁路建筑领域取得越来越广泛的应用,成为该行业赋能的重要技术手段之一。为研判BIM技术在铁路领域的应用现状及发展趋势,以国内外文献为数据源,运用文献计量理论方法,从研究热点和研究趋势两方面构建国内外BIM技术在铁路行业应用的知识图谱,从定性和定量两个角度剖析铁路领域BIM研究现状及趋势。研究结论:(1)国内外BIM技术在铁路工程领域的应用研究各有侧重点,国外注重BIM基础理论及标准化方面的研究且起步较早,成果较为丰硕,形成较为完整的知识体系,国内则多集中于工程实践的应用,虽原创性成果相对缺乏,但呈现出奋起直追之势;(2)从研究趋势角度分析,BIM技术与人工智能、物联网、云计算、大数据等新一代信息技术深度融合,实现铁路工程的协同设计、施工管理、运维阶段可视化管理、铁路全寿命周期管理、BIM应用标准化等工程领域深化应用,将成为未来的发展方向;(3)本文研究可为深入推广BIM技术在铁路领域的理论研究和实践应用提供借鉴。

关键词：建筑信息模型铁路知识图谱现状及趋势 CiteSpace

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Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode

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Plasma Science and Technology 2024年第1期26卷 34-41页

作者：王丰李继全曲洪鹏彭晓东 Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Ion temperature gradient(ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code(GKNET)in this work.Different from the traditional equilibrium circular magnetic-surface average(EMSA)method,an advanced algorithm that calculates the perturbed magnetic-surface average(PMSA)of the electric potential has been developed to precisely deal with the zonal flow component in a non-circular magnetic surface perturbed by magnetic islands.Simulations show that the electric potential vortex structure inside islands induced by the magnetic islands is usually of odd parity when using the EMSA method.It is found that the odd symmetry vortex can transfer into an even one after a steep zonal flow gradient,i.***.the flow shear has been built in the vicinity of the magnetic islands by adopting the PMSA algorithm.The phase of the potential vortex in the poloidal cross section is coupled with the zonal flow shear.Such an electric potential vortex mode may be of essential importance in wide topics,such as the turbulence spreading across magnetic islands,neoclassical tearing mode physics,and also the interaction dynamics between the micro-turbulence and MHD activities.

关键词： magnetic islands electric vortex ITG perturbed magnetic flux surface average

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