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Polar solvent induced in-situ self-assembly and oxygen vacancies on Bi_(2)MoO_(6)for enhanced photocatalytic degradation of tetracycline

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Nano Research 2024年第6期17卷 4951-4960页

作者： Fangyan liu Dongyue Su Weizhen liu Baiquan liu Chuan liu Hong Wang Mengye Wang State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275China School of Materials Sun Yat-Sen UniversityShenzhen 518107China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510006China

It has been proved to be an effective route to efficiently ameliorate photocatalytic performance of catalysts via designing three-dimensional(3D)hierarchical nanostructures and constructing oxygen vacancies(VOs).However,controlling the self-assembly of organization into 3D hierarchical nanostructures while introducing VOs in photocatalysts remains a ***,we reported an ethylene glycol(EG)mediated approach to craft 3D hydrangea-structure Bi_(2)MoO_(6)with VOs for efficient photocatalytic degradation of *** manipulating the EG concentration during the fabrication process,the influence of EG concentration on the Bi_(2)MoO_(6)structure was systematically *** could promote the self-assembly of Bi_(2)MoO_(6)nanosheets to form a 3D hierarchical *** with 2D nanoplates,3D hierarchical architecture enhanced the surface area and the amount of active sites of Bi_(2)MoO_(6).In addition,the reduction effect of EG on metallic oxide enabled the generation of VOs in Bi_(2)MoO_(6).The VOs adjusted the electronic structure of Bi_(2)MoO_(6),which not only enhanced the light harvesting,but also facilitated the simultaneous utilization of photo-induced electrons and holes to form reactive oxygen species(·O2−and·OH)for the efficient tetracycline decomposition.3D Bi_(2)MoO_(6)hydrangea with VOs achieved a 79.4%removal efficiency of tetracycline after 75 *** work provides a simple yet robust EG-mediated strategy,which not only promotes the self-assembly of nano-catalysts into 3D hierarchical architectures,but also crafts tunable VOs for highly efficient photocatalysis.

关键词： three-dimensional(3D)hierarchical nanostructures tunable oxygen vacancies ethylene glycol(EG)-mediated strategy bismuth molybdate photocatalytic degradation tetracycline

Thermal-hydraulic performance analysis and multi-objective optimization of a microchannel with staggered semi-elliptical ribs

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Science China Technological Sciences 2024年第10期67卷 3152-3167页

作者： CUI Pan liu Wei liu ZhiChun School of Energy and Power Engineering Huazhong University of Science and Technology

To enhance the cooling capacity of traditional microchannels for high heat flux electronic devices,a microchannel design with staggered semi-elliptical ribs is proposed in this *** numerical simulations,the flow characteristics of the designed microchannel are compared with those of a smooth one,and the effects of rib width（Wr）,rib height（Hr）,and rib length（Lr）,on the thermal-hydraulic performance are investigated under laminar flow *** results show that the periodically arranged ribs induce periodic vortices within the microchannel,effectively promoting fluid mixing and enhancing heat *** Hrhave similar effects on microchannel performance,with an increase in them leading to an enhanced thermal performance at the expense of deteriorated hydraulic ***,Lrhas a comparatively weaker influence,with both the heat transfer and flow resistance initially growing with increasing Lrand then *** strike a balance between the two performances,a multi-objective optimization on the three geometrical parameters is conducted at a Reynolds number（Re） *** with simulation data,artificial neural networks are trained as surrogate models,and a multi-objective genetic algorithm is employed to derive the Pareto *** the TOPSIS decision-making method,an optimal compromise solution is determined as Wr=0.2415 mm,Hr=0.0976 mm,and Lr=0.6486 *** testing on the optimized microchannel reveals that it exhibits high heat transfer,middle flow resistance,and excellent overall performance,with the performance evaluation criterion（PEC） falling between 1.572 and 1.723 within the Re range of 220–660.

关键词： heat transfer enhancement microchannel semi-elliptical rib numerical simulation multi-objective optimization

Recurrent Neural Network Inspired Finite-Time Control Design

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1527-1529页

作者： Jianan liu Shihua Li Rongjie liu School of Automation Southeast UniversityNanjing 210096China Department of Statistics Florida State UniversityFL 32304 USA IEEE

Dear Editor,This letter is concerned with the role of recurrent neural networks(RNNs)on the controller design for a class of nonlinear *** by the architectures of RNNs,the system states are stacked according to the dynamic along with time while the controller is represented as the neural network *** build the bridge between RNNs and finite-time controller,a novel activation function is imposed on RNNs to drive the convergence of states at finite-time and propel the overall control process *** stability proof is briefly provided for the convergence of the proposed finite-time *** last,a numerical simulation example is presented to illustrate the efficiency of the proposed *** networks can be classified as static(feedforward)and dynamic(recurrent)nets[1].The former nets do not perform well in dealing with training data and using any information of the local data structure[2].In contrast to the feedforward neural networks,RNNs are constituted by high dimensional hidden states with dynamics.

关键词： dynamics finite proof

钙对Mg-4Zn合金组织、织构及力学性能的影响（英文）

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稀有金属材料与工程 2019年第11期48卷 3506-3513页

作者：刘春全陈先华陈娇赵超越代言刘晓芳赵娣罗铸涂腾潘复生重庆大学轻合金国际联合实验室(教育部) 重庆400045 国家镁合金工程技术研究中心重庆400044 重庆市科学技术研究院重庆401123

研究了钙对Mg-4Zn合金组织、织构及力学性能的影响。铸态Mg-4Zn合金包含α-Mg相和Mg Zn相,Ca的加入还生成了Ca2Mg6Zn3三元相。结果表明,Ca显著细化挤压板材的晶粒尺寸,弱化板材织构。沿着板材横向,Mg-4Zn-0.3Ca合金的屈服强度为163MPa,... 详细信息

研究了钙对Mg-4Zn合金组织、织构及力学性能的影响。铸态Mg-4Zn合金包含α-Mg相和Mg Zn相,Ca的加入还生成了Ca2Mg6Zn3三元相。结果表明,Ca显著细化挤压板材的晶粒尺寸,弱化板材织构。沿着板材横向,Mg-4Zn-0.3Ca合金的屈服强度为163MPa,最终抗拉强度达到260 MPa。并且,加钙后合金延伸率从Mg-4Zn合金的19%提高到24%。分析了合金的再结晶机制,织构演变机理和强韧化机制,另外,合金力学性能与各向异性也得到了分析。

关键词：镁合金动态再结晶织构各向异性

Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： Pengcheng liu anyi liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu liu Tao Qin Qian liu Xijun liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models

制汁和灭菌方法对藕汁挥发性成分及香气的影响

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食品与发酵工业 2022年第7期48卷 117-125页

作者：顾艳阳牛丽影李大婧刘春泉肖丽霞扬州大学食品科学与工程学院江苏扬州225000 江苏省农业科学院农产品加工研究所江苏南京210014

莲藕汁因其特有的风味,多年来一直为消费者喜爱。为确定不同加工方式对藕汁风味的影响,采用压榨和匀浆2种方法制取生鲜莲藕汁,并分别进行了超高压(high pressure processing,HPP)(400 MPa,10 min)和高压蒸汽灭菌(autoclaving,AU)(121℃,... 详细信息

莲藕汁因其特有的风味,多年来一直为消费者喜爱。为确定不同加工方式对藕汁风味的影响,采用压榨和匀浆2种方法制取生鲜莲藕汁,并分别进行了超高压(high pressure processing,HPP)(400 MPa,10 min)和高压蒸汽灭菌(autoclaving,AU)(121℃,15 min)2种灭菌处理。藕汁挥发性成分采用顶空固相微萃取与气质联机的方法进行了测定,并采用定量感官描述法对香气差异进行了分析。共检测出57种成分,其中醇类13种,醛类11种,酸类1种,酮类2种,烃类9种,酯类4种,含硫类3种,杂环类13种,肟类1种。压榨藕汁总峰面积在HPP和AU处理后分别增加6.89和19.53倍,而匀浆藕汁仅增加1.23和1.40倍。采用主成分分析法对挥发性成分和香气感官属性的相关性进行了分析,结果显示,压榨生鲜汁与其AU处理样品在主成分1方向距离最远,说明压榨汁对处理更为敏感。HPP处理样品与未灭菌样品聚集并以青草香为特点,相关成分有正辛醇、异戊醛等;AU处理可以增强总香气强度并体现为甜香、谷物香、果香,与硫化物、杂环类、烃类等成分密切相关。总体而言,制汁方式和灭菌方式的不同均会使挥发性成分和香气发生改变,而AU处理的影响大于HPP处理,尤其压榨汁表现更为明显。该研究为藕汁生产中风味的评价与调控提供借鉴。

关键词：藕汁挥发性成分制汁方法超高压处理高温蒸汽杀菌

Experimental and numerical study on ignition and combustion characteristics of boron-magnesium composite powders

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Particuology 2024年第1期84卷 12-29页

作者： Shuyuan liu Luyang Han Hongmei liu Yingkai Song Linlin liu Songqi Hu Science and Technology on Combustion Internal Flow and Thermo-Structure LaboratoryNorthwestern Polytechnical UniversityXi'an710072China School of Mechanical Engineering and Rail Transit Changzhou UniversityChangzhou213164China Shanghai Institute of Space Propulsion Shanghai201112China Shanghai Engineering Research Center of Space Engine Shanghai201112China

A high-pressure laser ignition and combustion system with adjustable oxidizer gas atmosphere is established to investigate the ignition and combustion characteristics of boron-magnesium(BM)com-posite *** ignition and combustion model of BM powders is established and validated in the present *** results show that increasing water content,O_(2) content and Mg content all result in shorter ignition delay time of BM powders,among which the effect of water content is the most ***,ignition delay time increases as pressure *** combustion time decreases with increasing Mg content and ambient pressure but increases with water *** the increase of O_(2) content,combustion time of BM powders first increases and then decreases,which means a critical O_(2) content exists above which combustion time *** results show that there exists a trade-off between ignition and combustion performance of BM composite powders.

关键词： Boron magnesium powder Laser ignition Ignition and combustion model Reaction mechanism Numerical model

基于主成分与聚类分析的菜用大豆品质综合评价

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食品科学 2015年第13期36卷 12-17页

作者：宋江峰刘春泉姜晓青李大婧江苏省农业科学院农产品加工研究所江苏南京210014 国家蔬菜加工技术研发分中心江苏南京210014 南京农业大学食品科技学院江苏南京210095

为提高菜用大豆品种品质性状的选择效率,优化菜用大豆品质评价体系,以江苏省主栽的18个菜用大豆品种为试材,分析其物理特性指标(荚长、荚宽、荚厚、百荚质量、百粒质量、L*、a*、b*、硬度、水分含量)和化学特性指标(VC、叶绿素、粗脂肪... 详细信息

为提高菜用大豆品种品质性状的选择效率,优化菜用大豆品质评价体系,以江苏省主栽的18个菜用大豆品种为试材,分析其物理特性指标(荚长、荚宽、荚厚、百荚质量、百粒质量、L*、a*、b*、硬度、水分含量)和化学特性指标(VC、叶绿素、粗脂肪、淀粉、可溶性糖、可溶性蛋白、异黄酮含量,脂氧合酶(lipoxygenase,LOX)活力)。结果表明:品质特性中叶绿素和异黄酮含量、LOX活力、淀粉含量、百粒质量、百荚质量、a*在品种间变异系数较大,而L*和水分含量变异系数较小,其余指标变化均不显著。主成分分析表明18项指标反映的菜用大豆品质可用7个主成分来表示(累计贡献率达92.332 9%)。进一步根据聚类分析结果,筛选出百粒质量以及叶绿素、VC、可溶性糖、粗脂肪、异黄酮含量,硬度和a*这8个品质指标代替原有的18项指标,为品质评价指标体系的简化提供了可能。18个菜用大豆品种中,徐豆17号综合品质最好,其次是区凡2号和新大粒1号,苏豆8号综合品质最差。

关键词：菜用大豆品质性状主成分分析聚类分析

CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds

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Particuology 2024年第5期88卷 266-281页

作者： Lin Jiang Mofan Qiu Rongzheng liu Bing liu Youlin Shao Malin liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

The spouted bed has been used in the coating process of high-density nuclear fuel *** particle fluidization behaviors in pseudo-2D and 3D spouted beds were simulated and *** effects of four independent variables(cone angle,particle density,inlet gas velocity,and particle loading)on particle fluidization behaviors in the 3D spouted bed were investigated *** cone angle effect on fluidization mechanism was studied quantitatively first time.A new fluidization quality index was proposed based on the particle entrainment principle,and an extreme value was obtained when the cone angle was 60°,considered to be the optimum value for the 3D conical spouted *** was indicated the gas–solid contact efficiency can be kept up if the gas velocity was proportional to ρ_(p)^(0.65) and N_(p)^(0.78) when the particle density or loading was *** results will be useful for geometry and operation parameters design of the 3D conical spouted bed and helpful for developing the fluidization mechanism of high-density particles.

关键词： Spouted bed High-density particle CFD-DEM Fluidization quality index Particle loading