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High-efficiency Carbonation Modification Methods of Recycled Coarse Aggregates

Journal of Wuhan university of Technology(Materials Science) 2024年第2期39卷 386-398页

作者：张美香 YANG Xiaolin 丁亚红 SUN Bo ZHANG Xianggang LÜXiuwen Department of Civil Engineering Henan Polytechnic UniversityJiaozuo 454150China College of Architectural Engineering Xinyu UniversityXinyu 336500China

To solve the problem of only surface carbonation and realize high-efficiency carbonation of recycled coarse aggregate,the method of carbonated recycled coarse aggregate with nano materials pre-soaking was first put *** carbonation effect of modified recycled coarse aggregate with three different carbonation methods was evaluated,and water absorption,apparent density and crush index of modified recycled coarse aggregate were *** with XRD,SEM,and MIP microscopic analysis,the high-efficiency carbonation strengthening mechanism of modified recycled coarse aggregate was *** experimental results show that,compared with the non-carbonated recycled coarse aggregate,the physical and microscopic properties of carbonated recycled coarse aggregate are *** method of carbonation with nano-SiO_(2) pre-soaking can realize the high-efficiency carbonation of recycled coarse aggregate,for modified recycled coarse aggregate with the method,water absorption is reduced by 23.03%,porosity is reduced by 44.06%,and the average pore diameter is 21.82 *** high-efficiency carbonation strengthening mechanism show that the pre-socked nano-SiO_(2) is bound to the hydration product Ca(OH)_(2) of the old mortar with nano-scale C-S-H,which can improve the CO_(2) absorption rate,accelerate the carbonation reaction,generate more stable CaCO_(3) and nano-scale silica gel,and bond to the dense three-dimensional network structure to realize the bidirectional enhancement of nano-materials and pressurized *** is concluded that the method of carbonation with nano-SiO_(2) pre-soaking is a novel high-efficiency carbonation modification of recycled coarse aggregate.

关键词： recycled coarse aggregate pressurized carbonation high-efficiency carbonation nano-SiO2 strengthening mechanism

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Influence of the Hook Position on the Vertical Vibrations of an Automobile Exhaust System:Application of the Robust Optimization Design

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Fluid Dynamics & Materials Processing 2021年第3期17卷 555-567页

作者： Jianqiang Xiong xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing Xinyu UniversityXinyuChina

A robust optimization design method is proposed to investigate the influence of the hook position on the vertical vibration(bending)of an automobile exhaust system.A block diagram for the robustness analysis of the exhaust system is initially constructed from the major affecting ***,the second-order inertia force is set as the vibration excitation source of the exhaust system and the displacement of four hooks of the exhaust system is selected as the variable *** tests are carried out to investigate the resulting vertical bending considering four influencing factors and three levels of ***,a variance analysis of the vertical bending is *** present study provides a set of guidelines to control the key factors affecting the vibration of vehicle exhaust systems while proposing an effective method to reduce vehicle vibration and improve noise analysis。

关键词： Robust optimization design exhaust system modal analysis excitation source

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Effect of Aggregate Gradation on the Properties of 3D Printed Recycled Coarse Aggregate Concrete

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Journal of Wuhan university of Technology(Materials Science) 2024年第6期39卷 1541-1554页

作者： DING Yahong TONG Jiaqi ZHANG Meixiang GUO Shuqi ZHANG Yaqi ZHAO Yu Department of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China Department of College of Architectural Engineering Xinyu UniversityXinyu 338004China

A simplex centroid design method was employed to design the gradation of recycled coarse *** bulk density was measured while the specific surface area and average excess paste thickness were calculated with different *** fluidity,dynamic yield stress,static yield stress,printed width,printed inclination,compressive strength and ultrasonic wave velocity of 3D printed recycled aggregate concrete(3DPRAC)were further *** experimental results demonstrate that,with the increase of small-sized aggregate(4.75-7 mm)content,the bulk density initially increases and then decreases,and the specific surface area gradually *** average excess paste thickness fluctuates with both bulk density and specific surface *** workability of 3DPRAC is closely related to the average excess paste *** an increase in average paste thickness,there is a gradual decrease in dynamic yield stress,static yield stress and printed inclination,accompanied by an increase in fluidity and printed *** mechanical performance of 3DPRAC closely correlates with the bulk *** an increase in the bulk density,there is an increase in the ultrasonic wave velocity,accompanied by a slight increase in the compressive strength and a significant decrease in the anisotropic ***,an index for buildability failure of 3DPRAC based on the average excess paste thickness is proposed.

关键词： 3D printed recycled coarse aggregate concrete aggregate gradation excess paste workability mechanical performance

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Recent Application and Progress of Metal Halide Perovskite Photodetector on Flexible Substrates

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Chinese Journal of Chemistry 2023年第24期41卷 3689-3702页

作者： Shuigen Li Xiangyu Xie Fan Huang Lili Shu Langyu Liu Chasheng Wang Yong Yang Rong Li School of New Energy Science and Engineering Xinyu UniversityXinyuJiangxi338004 China Department of Engineering Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhanHubei430074 China School of Mathematics and Computer Science Xinyu UniversityXinyuJiangxi338004 China Orthopedics of People's Hospital of xinyu XinyuJiangxi338004 China

In recent years,flexible photodetectors(FPDs)have received increasing attention due to their applications in electronic eyes,flexible sensing,terminal devices,and wearable *** addition,metallic halide perovskite materials are considered as future materials for FPDs due to their compatibility with flexible substrates,low cost,simple synthesis methods,and superior optoelectronic *** review provides a comprehensive overview of the relevant cutting-edge research in the field of flexible perovskite photodetectors(FPPDs)from 2020 to ***,the evaluation criteria for FPPDs are discussed and the development of perovskite stability criteria is emphatically ***,the synthesis methods and device construction processes of metal halide perovskite materials commonly used by researchers in the past three years are *** include single crystals and low-dimensional ***,we have elaborated on the research of self-powered FPPD and its contributions in wearability,terminals,and ***,a summary of developments and possibilities in the field of FPPDs from 2020 to 2022 is provided.

关键词： 2D/3D perovskites Perovskite phases Nanostructures photodetectors Self-powered Heterojunction

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Second Main Theorem for Meromorphic Maps into Algebraic Varieties Intersecting Moving Hypersurfaces Targets

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Chinese Annals of Mathematics,Series B 2021年第5期42卷 753-776页

作者： Libing XIE Tingbin CAO Department of Mathematics Nanchang UniversityNanchang 330031China Department of Mathematics Xinyu UniversityXinyu 338004JiangxiChina

Since the great work on holomorphic curves into algebraic varieties intersecting hypersurfaces in general position established by Ru in 2009, recently there has been some developments on the second main theorem into algebraic varieties intersecting moving hypersurfaces targets. The main purpose of this paper is to give some interesting improvements of Ru’s second main theorem for moving hypersurfaces targets located in subgeneral position with index.

关键词： Algebraic varieties Holomorphic curves Nevanlinna theory Moving hypersurfaces

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Mechanical Property and Microstructure of Cement Mortar with Carbonated Recycled Powder

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Journal of Wuhan university of Technology(Materials Science) 2024年第3期39卷 689-697页

作者：丁亚红张美香 YANG Xiaolin XU Ping SUN Bo GUO Shuqi Department of Civil Engineering Henan Polytechnic UniversityJiaozuo 454150China College of Architectural Engineering Xinyu UniversityXinyu 336500China

Carbonated recycled powder as cementitious auxiliary material can reduce carbon emissions and realize high-quality recycling of recycled *** this paper,microscopic property of recycled powder with three carbonation methods was tested through XRD and SEM,the mechanical property and microstructure of recycled powder mortar with three replacement rates were studied by ISO method and SEM,and the strengthening mechanism was *** results showed that the mechanical property of recycled powder mortar decreased with the increasing of replacement *** is suggested that the replacement rate of recycled powder should not exceed 20%.The strength index and activity index of carbonated recycled powder mortar were improved,in which the flexural strength was increased by 27.85%and compressive strength was increased by 20%at the *** powder can be quickly and completely carbonated,and the improvement effect of CH pre-soaking carbonation was the *** activity index of carbonated recycled powder can meet the requirements of Grade II technical standard for recycled *** results revealed the activation mechanism of carbonated recycled powder such as surplus calcium source effect,alkaline polycondensation effect and carbonation enhancement effect.

关键词： recycled powder carbonation activation compound carbonation activity index mechanical property microstructure

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Preparation of unidirectional porous AlN ceramics via the combination of freeze casting and combustion synthesis

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Journal of Materials Science & Technology 2022年第5期100卷 161-168页

作者： Zhilei Wei Zhejian Zhang Xiaoyu Zhang Zhiyuan Li Tao Li Jiabin Hu Shunjian Xu Zhongqi Shi State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical and Electrical Engineering Xinyu UniversityXinyu 338000China

Unidirectional porous AlN ceramics(UP-AlNs)have attracted great attention for their wide applications in catalyst supports,filters and composite ***,traditional fabrication processes usually require high temperature and long production ***,UP-AlNs were successfully fabricated via the combination of tertiary butyl alcohol(TBA)-based freeze casting and combustion synthesis route using Al and AlN powders as raw *** microstructure,open porosity,thermal conductivity and compressive strength of UP-AlNs can be manipulated by synergistically regulating the AlN diluent content and Al/AlN solid loading of the freezing *** optimal UP-AlNs exhibited controllable structure wavelength(λ)and open porosity in a wide range of 21.1-47.1μm and 54.2%-86.0%,*** addition,the corresponding products also possessed anisotropic thermal conductivity and compressive *** novel route for the fabrication of UP-AlNs has the advantages of low cost,energy-saving and high efficiency,which shows significant promise for industrial applications.

关键词： AlN Freeze casting Combustion synthesis Thermal conductivity Compressive strength

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Research and Application of Internal Combustion Coal-Oxygen Burner for Fluxing in EAF

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Journal of Iron and Steel Research International 1999年第1期6卷 23-26页

作者： Zhu Rong Sun Yanhui Qiu Yongquan Ouyang Guang Chen Haiping Guo Changhua university of Science and Technology Beijing xinyu Iron and Steel Company

The investigation shows that using internal combustion coal-oxygen burner for the intensification of melting in EAF is *** combustion coal-oxygen burner is better than external combustion coal-oxygen burner in the performance and energy saving of the *** consumption is decreased by 40 kW ? h/t,melting time is shortened by 18 *** application of internal combustion coal-oxygen burner has a significant effect on decreasing EAF energy consumption.

关键词： EAF coal-oxygen burner internal combustion energy saving

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SECTORIAL OSCILLATION THEORY OF LINEAR DIFFERENTIAL EQUATIONS

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Acta Mathematica Scientia 2013年第4期33卷 1177-1186页

作者：吴昭君陈裕先 School of Mathematics and Statistics Hubei University of Science and Technology School of Mathematics and Computer Science Xinyu University

In this paper, the sectorial oscillation of the solutions of higher order homo- geneous linear differential equationswith infinite order entire function coefficients is studied. Results are obtained to extend some res... 详细信息

关键词： radial exponent of convergence iterated order sectorial oscillation Boreldirection

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An neutron generator-based NIPGA system for on-site analysis

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Nuclear Science and Techniques 2010年第1期21卷 63-64页

作者： JIA Fuquan1,2 GU Deshan1 CHENG Daowen1 LIU Linmao1,ZHU Qibo3 WANG Jishan3 (1 Radiation Technology Institute,Northeast Normal university,Changchun 130117,China 2 Department of Basic Science,Jilin Institute of Architecture and Civil Engineering,Changchun 130021,China 3 Dehui xinyu Cement Co.,Ltd,Dehui 130300,China) Radiation Technology Institute Northeast Normal University Dehui xinyu Cement Co.Ltd

Utilizing NIPGA,an experimental device for cement raw material analysis has been developed,with a 2.5 MeV D-D neutron generator,BGO detector and 2048 MCA.A linear regression was developed for calculating the data.A 6-month on-site application of the system showed that the CaO,SiO2,Fe2O3 and Al2O3 analysis results agreed well with chemical analysis,within 0.40%,0.40%,0.50% and 0.50%,respectively.

关键词：中子发生器系统 BGO探测器 Al2O3 Fe2O3 原料分析实验装置回归计算

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