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Physical modelling of particle transport phenomenon and vibration behavior of converter with bottom powder injection

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Journal of Iron and Steel Research International 2022年第11期29卷 1771-1788页

作者： Jing-shi zhang Wen-tao Lou Miao-yong zhu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

A cold model of top-bottom blown converter was set up to study the particle transport phenomenon and vibration performance of converter with bottom powder *** effect of bottom blowing flow rates,tuyere diameters,arrangements,and powder to gas mass ratios on powder distribution and furnace body vibration was *** results show that the bottom injection parameters and modes have significant effects on the particle transport behavior and furnace *** powder dispersion uniformity and furnace vibration increase with the increase in bottom blowing tuyere *** the lower range of bottom blowing flow rates and powder to gas mass ratios,the powder dispersion uniformity is improved with the increase in ***,in the higher range,the excessive furnace vibration leads to reduction in uniformity in powder *** the bottom blowing tuyeres arrange at double arrangement of 0.5R(R refers to the radius of the bottom)distance between tuyere and center of bath bottom,the converter has optimal particle transport behavior and vibration *** vibration law of converter with bottom powder injection was revealed by deducing the empirical formulas of furnace vibration maximum *** vibration intensity is affected by Froude number,powder to gas mass ratio,and tuyere arrangement.

关键词： Converter steelmaking Bottom powder injection Powder dispersion uniformity Furnace vibration Physical modelling

ImSpiRE: image feature-aided spatial resolution enhancement method

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Science China Life Sciences 2025年第1期 272-283页

作者： Yuwei Hua Yizhi zhang Zhenming Guo Shan Bian yong zhang State Key Laboratory of Cardiovascular Diseases and Medical Innovation Center Institute for Regenerative MedicineDepartment of NeurosurgeryShanghai East HospitalShanghai Key Laboratory of Signaling and Disease ResearchFrontier Science Center for Stem Cell ResearchSchool of Life Sciences and TechnologyTongji University

The resolution of most spatially resolved transcriptomic technologies usually cannot attain the single-cell level, limiting their applications in biological discoveries. Here, we introduce ImSpiRE, an image feature-aided spatial resolution enhancement method for in situ capturing spatial transcriptome. Taking the information stored in histological images, ImSpiRE solves an optimal transport problem to redistribute the expression profiles of spots to construct new transcriptional profiles with enhanced resolution, together with extending the gene expression profiles into unmeasured regions. Applications to multiple datasets confirm that ImSpiRE can enhance spatial resolution to the subspot level while contributing to the discovery of tissue domains, signaling communication patterns, and spatiotemporal characterization.

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Numerical Simulation of Fluid Flow and Heat Transfer in Funnel Shaped Mold of Thin Slab Continuous Caster

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Journal of Iron and Steel Research International 2005年第6期12卷 14-19页

作者： zhu Miao-yong WANG Jun zhang Ying Northeastern University Shenyang 110004 China

Thin slab casting is used widely in the world. The control of molten steel flow and solidification in the mold is difficult due to the high casting speed and complicated configuration of the mold. Numerical simulation was carried out to study the fluid flow and heat transfer in the funnel shaped mold. The influence of nozzle design, casting speed and nozzle submersion depth on the flow and temperature fields in the mold was investigated, and guidance for selecting configurations of submerged nozzle was obtained.

关键词： thin slab continuous casting fluid flow heat transfer numerical simulation

New Immersed Boundary Method on the Adaptive Cartesian Grid Applied to the Local Discontinuous Galerkin Method

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 176-185页

作者： Xu-Jiu zhang yong-Sheng zhu Ke Yan You-Yun zhang Key Laboratory of Education Ministry for Modern Design&Rotor-Bearing System Xi'an Jiaotong University

Currently, many studies on the local discontinuous Galerkin method focus on the Cartesian grid with low computational e ciency and poor adaptability to complex shapes. A new immersed boundary method is presented, and this method employs the adaptive Cartesian grid to improve the adaptability to complex shapes and the immersed boundary to increase computational e ciency. The new immersed boundary method employs different boundary cells(the physical cell and ghost cell) to impose the boundary condition and the reconstruction algorithm of the ghost cell is the key for this method. The classical model elliptic equation is used to test the method. This method is tested and analyzed from the viewpoints of boundary cell type, error distribution and accuracy. The numerical result shows that the presented method has low error and a good rate of the convergence and works well in complex geometries. The method has good prospect for practical application research of the numerical calculation research.

关键词： Immersed boundary method Adaptive Cartesian grid Local discontinuous Galerkin method Reconstruction Heat transfer equation

BiOBr/COF S-scheme photocatalyst for H_(2)O_(2) production via concerted two-electron pathway

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Journal of Materials Science & Technology 2023年第35期166卷 241-249页

作者： Haozhen zhang Jingjing Liu yong zhang Bei Cheng Bicheng zhu Linxi Wang Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of Geosciences68 Jincheng StreetWuhan 430078China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Constructing step-scheme(S-scheme)heterojunctions has become a popular strategy for efficient pho-tocatalytic H_(2)O_(2) ***,we in situ grew BiOBr nanosheets(NSs)on a Schiff-base covalent organic framework(COF)with largeπ-conjugated structures to prepare S-scheme BiOBr/COF photocat-alysts for H_(2)O_(2) *** highest photocatalytic H_(2)O_(2) production performance of the composite sample constituting the S-scheme heterojunction is 3749μmol g−1 h−1,which was 1.85 and 27 times the rates of COF and BiOBr,*** construction of S-scheme heterojunction contributed to ef-ficient carrier transfer and separation in space and enhanced redox ***,the lying-down O_(2)-adsorption configuration on the COF surface favors the concerted two-electron O_(2) reduction process,which greatly reduced the reduction potential requirement for O_(2)-to-H_(2)O_(2) *** synergy be-tween the S-scheme heterojunction and the unique O_(2)-COF interaction boosted photocatalytic H_(2)O_(2) pro-duction activity.

关键词： S-scheme heterojunction Photocatalytic H_(2)O_(2)production Covalent organic frameworks Concerted two-electron O_(2)reduction O_(2)-adsorption configuration

Direct Observation of Domain-Inverted Regions in Proton-Exchanged LiNbO_(3) Using Transmission Electron Microscopy

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Chinese Physics Letters 1996年第5期13卷 362-365页

作者： zhang Zhi-yong WANG Lu-chun zhu yong-yuan zhu Shi-ning MIN Nai-ben National Laboratory of solid state microstructures Nanjing Universityand Center for Advanced Studies in Science and Technology of MicrostructuresNanjing 210093

Direct observation of the domain-in-verted regions in LiNbO_(3) formed by proton exchange followed by heat treatment is performed by using transmission electron microscopy.A charged straight 180°tivinning domain boundary was revealed and compared with winding domain boundaries in LiNbO_(3) grown by Czochralski *** results are significant to studying the mechanism of domain inversion and morphology of inversion domains.

关键词： method. straight Electron

Predicting buckling of carbon fiber composite cylindrical shells based on backpropagation neural network improved by sparrow search algorithm

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Journal of Iron and Steel Research International 2023年第12期30卷 2459-2470页

作者： Wei Guan yong-mei zhu Jun-jie Bao Jian zhang School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina

The buckling load of carbon fiber composite cylindrical shells(CF-CCSs)was predicted using a backpropagation neural network improved by the sparrow search algorithm(SSA-BPNN).Firstly,two CF-CCSs,each with an inner diameter of 100 mm,were manufactured and *** buckling behavior of CF-CCSs was analyzed by finite element and ***,the effects of ply angle and length–diameter ratio on buckling load of CF-CCSs were analyzed,and the dataset of the neural network was generated using the finite element *** this basis,the SSA-BPNN model for predicting buckling load of CF-CCS was *** results show that the maximum and average errors of the SSA-BPNN to the test data are 6.88%and 2.24%,*** buckling load prediction for CF-CCSs based on SSA-BPNN has satisfactory generalizability and can be used to analyze buckling loads on cylindrical shells of carbon fiber composites.

关键词： Composite cylindrical shell:Carbon fiber Backpropagation neural network Sparrow search algorithm Buckling

Effect of microstructure and passive film on corrosion resistance of 2507 super duplex stainless steel prepared by different cooling methods in simulated marine environment

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International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1100-1114页

作者： Min zhu Qiang zhang yong-feng Yuan Shao-yi Guo School of Mechanical Engineering&Automation Zhejiang Sci-Tech UniversityHangzhou 310018China National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products Zhejiang Sci-Tech UniversityHangzhou 310018China

The effect of microstructure and passive film on the corrosion resistance of 2507 super duplex stainless steel(SDSS)in simulated marine environment was investigated by electrochemical measurements,periodic wet–dry cyclic corrosion test,scanning Kelvin probe force microscopy,atomic force microscopy,and X-ray photoelectron *** results show that the occupation ratio ofγphase increases with the decrease in cooling rate,whereas the content ofαphase reduces *** addition,theσprecipitated phase only emerges in the annealed *** pitting sensitivity and corrosion rate of 2507 SDSS reduce first and then increase as the cooling rate ***σprecipitated phase drastically reduces the protective ability of the passive film and facilitates micro-galvanic corrosion of the annealed *** various microstructures,the pits are preferentially distributed within theσandγ*** corrosion resistance of 2507 SDSS prepared by different cooling methods is closely related to the microstructure and structure(stability and homogeneity)of the passive *** steel shows an optimal corrosion resistance,followed by the quenched and annealed steels.

关键词： stainless steel microstructure corrosion resistance passive film

倾斜Ag纳米棒阵列的等离子体共振的SERS光谱研究

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吉林师范大学学报（自然科学版） 2018年第3期39卷 7-10页

作者：张永军朱奥男高稔现吉林师范大学物理学院吉林四平136000

以六方密排聚苯乙烯小球阵列为模板,利用倾斜磁控溅射方法制备了倾斜Ag纳米棒阵SERS活性基底.通过514 nm激发线拉曼光谱测试发现,随着周期性Ag纳米棒阵列倾斜角度的增加,修饰在其表面的4-MBA分子的A1震动模式处所对应的主峰出现了明显... 详细信息

以六方密排聚苯乙烯小球阵列为模板,利用倾斜磁控溅射方法制备了倾斜Ag纳米棒阵SERS活性基底.通过514 nm激发线拉曼光谱测试发现,随着周期性Ag纳米棒阵列倾斜角度的增加,修饰在其表面的4-MBA分子的A1震动模式处所对应的主峰出现了明显的红移现象.通过时域有限差分(FDTD)数值模拟和线偏振拉曼光谱结合的方法,准确解释了拉曼光谱中主峰产生红移现象的根本原因.

关键词： SERS 4-MBA 纳米棒阵列 LSPR