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A boundary layer model for capture of inclusions by steel-slag interface in a turbulent flow

Journal of Iron and Steel Research International 2023年第6期30卷 1101-1108页

作者： Yi-peng Sun Hao-jian duan Li-feng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

A boundary layer model was developed to predict the capture of inclusions by steel-slag interface in a turbulent fluid flow,which is based on the detailed analysis of inclusion *** effective boundary layer for inclusion removal was proposed by a statistical *** is noticed that the capture of inclusions by steel-slag interface is not only dependent on the diameter of inclusions but also related to the local turbulent *** high turbulent flow fields,the transport of inclusions is mainly dominated by the turbulent flow,and thus,the effective boundary layer thickness is mainly affected by the level of turbulent kinetic energy and is almost independent of the inclusion *** inertia of inclusions gradually takes over the stochastic effect of turbulent flow,and the effect of inclusion diameter on effective boundary layer thickness becomes more noticeable with the decrease in the level of turbulent kinetic ***,the effective boundary layer thickness is more susceptible to the inclusion diameter for larger inclusions due to its greater inertia under the same turbulent condition while it principally depends on the level of turbulent kinetic energy for smaller *** the characteristic velocity increases,the time for inclusions transport and interaction with steel-slag interface decreases,and thus,the effective boundary layer thickness ***,the graphical user interface was developed by using the cubic spline interpolation for ease of coupling the current boundary layer model with the macro-scale model of a turbulent fluid flow in the metallurgical vessel.

关键词： Boundary layer model Capture of inclusions steel–slag interface Turbulent flow

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A new benzylisoquinoline alkaloid from stems of Nelumbo nucifera

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Chinese Chemical Letters 2008年第3期19卷 308-310页

作者： Xu Hong duan jian Qin jiang Department of Natural Medicine Chemistry China Pharmaceutical University Nanjing 210038 China

A new benzylisoquinoline alkaloid, named nelumstemine （1）, 1-（4＇-hydroxybenzoyl）-6,7-dimethoxy-3,4-dihydroisoquinoline, was isolated from the stems of Nelumbo nucifera Geartn. Its structure was established on the... 详细信息

关键词： Nelumbo nucifera Geartn Nelumstemine Dihydroisoquinoline Benzylisoquinoline alkaloids

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Anti-synchronization in Different Hyperchaotic Systems

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Communications in Theoretical Physics 2008年第10期50卷 907-912页

作者： DOU Fu-Quan SUN jian-An duan Wen-Shan College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

Based on active control theory, anti-synchronization between two different hyperchaotic systems is investigated. The sufficient conditions for achieving anti-synchronization of two different hyperchaotic systems are derived. Moreover, numerical simulations are presented for hyperehaotic Lorenz-Chen system, hyperchaotic Lorenz-Lu system, and hyperchaotic Chen Lu system to verify the effectiveness and feasibility of the proposed anti-synchronization scheme.

关键词： anti-synchronization hyperchaotic system active control

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Distribution of TiN inclusions in Ti-stabilized ultra-pure ferrite stainless steel slab

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Journal of Iron and Steel Research International 2019年第9期26卷 962-972页

作者： Hao-jian duan Ying Zhang Ying Ren Li-feng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

In order to clarify and control the silver defect on surface of cold-rolled sheet of the Ti-stabilized ultra-pure ferrite stainless steel, the distribution of TiN inclusions on the cross section of hot-rolled plate was studied using automated scanning electron microscopy/energy-dispersive X-ray spectroscopy inclusion analysis (ASPEX 1020 system). It was found that the number density decreases sharply from the surface to the center of the hot-rolled plate, whereas the average size increases. Then, the distribution of TiN inclusions on the cross section of continuously cast slab was investigated. Similarly, numerous small-sized TiN inclusions were generated at the subsurface of the slab. The average size rapidly increased and the number density dramatically decreased from the subsurface to 1/4 thickness, while from 1/4 thickness to 1/2 thickness, the increase in average size and the decrease in number density were slight. Thermodynamics results showed that TiN inclusion was formed below the liquidus temperature, which indicated that TiN inclusions could not be formed during secondary refining. Considering the microsegregation of solute elements and the equilibrium of TiN formation during solidification, TiN precipitated in the mushy zone when the solid fraction was close to 0.2. The growth of TiN was analyzed based on the diffusion-controlled growth model. With the increase in cooling rate, the time for TiN growth decreased and the size of TiN inclusions was diminished, which revealed the size distribution of TiN inclusions in the cast slab qualitatively.

关键词： TiN inclusion Ti-stabilized ultra-pure ferrite stainless steel Distribution in slab Thermodynamics Diffusion-controlled growth model

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Highly defective HKUST-1 with excellent stability and SO_(2) uptake: The hydrophobic armor effect of functionalized ionic liquids

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Green Energy & Environment 2024年第11期9卷 1711-1723页

作者： Ping Liu Kaixing Cai Keliang Wang Tianxiang Zhao duan-jian Tao Key Laboratory of Green Chemical and Clean Energy Technology School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang550025China Engineering Research Center of Efﬁcient Utilization for Industrial Waste Guizhou UniversityGuiyangGuizhou550025China School of Chemistry and Materials Engineering Liupanshui Normal UniversityLiupanshui553004China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330022China

Water stability is one of the most important factors restricting the practical application of metal organic frameworks (MOFs). In this work, wefabricate a highly defective HKUST-1 framework with a mixed valence of CuI/CuIIby mechanical ball milling method. This defective HKUST-1is embellished by functionalized ionic liquids as hydrophobic armor, making the hybrid HIL1@HKUST-1 exhibits outstanding water stability,remarkable SO_(2) adsorption (up to 5.71 mmol g^(-1)), and record-breaking selectivity (1070 for SO_(2)/CO_(2) and 31,515 for SO_(2)/N_(2)) at 25 ℃ and0.1 bar, even in wet conditions.

关键词： Metal organic frameworks SO_(2)adsorption Water stability Mechanochemistry Ionic liquids

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New Periodic Wave Solutions, Localized Excitations and Their Interaction Properties for （3＋1）-Dimensional Jimbo-Miwa Equation

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Communications in Theoretical Physics 2007年第4X期48卷 584-590页

作者： DOU Fu-Quan SUN jian-An duan Wen-Shan LU Ke-Pu College of Physics and Electronics Engineering Northwest Normal University Lanzhou 730070 China

Based on the multi-linear variable separation approach, a class of exact, doubly periodic wave solutions for the （3＋1）-dimensional Jimbo-Miwa equation is analytically obtained by choosing the Jacobi elliptic functions and their combinations. Limit cases are considered and some new solitary structures （new dromions） are derived. The interaction properties of periodic waves are numerically studied and found to be inelastic. Under long wave limit, two sets of new solution structures （dromions） are given. The interaction properties of these solutions reveal that some of them are completely elastic and some are inelastic.

关键词： Jimbo-Miwa equation Jacobi elliptic function periodic solutions dromions

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Water modeling on fluid flow and mixing phenomena in a BOF steelmaking converter

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Journal of Iron and Steel Research International 2024年第3期31卷 595-607页

作者： Xin-yu Cai Hao-jian duan Ding-han Li Anjun Xu Li-feng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

A 1∶8 physical water model was constructed to investigate the fluid flow and mixing phenomena in the basic oxygen furnace(BOF)*** particle image velocimetry was employed to measure the velocity distribution of the bath and the high-speed camera was applied to capture the cavity shape in the combined blowing BOF *** mixing time for varied operating conditions was measured by the stimulus-response *** cavity depth increased with the decrease in the lance height and the increase in the top gas flow rate while the bottom blowing gas had little influence on the cavity *** minimum cavity depth was obtained under the condition of a 69.8 m^(3)/h top gas flow rate,a 287.5 mm lance height and a 0.93 m^(3)/h bottom blowing gas flow rate,which was 161.2 *** mixing time decreased as the lance height decreased and the top blowing gas flow rate *** mixing time was first decreased and then increased with the increase in the bottom gas flow *** the condition of 69.8 m^(3)/h gas flow rate of top blowing,the 287.5 mm lance height and the 0.93 m^(3)/h gas flow rate of bottom blowing,the mixing time in the converter was 48.65 *** empirical formula between the stirring power and the mixing time in the converter was calculated.

关键词： Water model Fluid flow Particle image velocimetry Mixing time BOF converter

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Relationship between topography and the distribution of understory vegetation in a Pinus massoniana forest in Southern China

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International Soil and Water Conservation Research 2015年第4期3卷 291-304页

作者： Bangwen Wang Guanghui Zhang jian duan Anhui and Huaihe River Institute of Hydraulic Research Anhui Province Key Laboratory of Water Conservancy and Water ResourcesHefei 230088China School of Geography Beijing Normal UniversityBeijing 100875China jiangxi Institute of Soil and Water Conversation Key Laboratory of Soil Erosion and PreventionNanchang 330029China

The poor growth of understory vegetation and the severe losses of soil and water in Pinus massoniana forests have recently become serious concerns in an area in southern China with eroded red *** influence of topography on the spatial distribution of vegetation,however,has received little *** study combined several multivariate analyses to discern the complicated relationship between understory vegetation and ***-six plots(10 m×10 m)were sampled in a field survey of the vegetation and topography in the central red-soil *** distributions of the understory vegetation differed significantly amongst the *** plants grew in gullies,and few grew on *** low coverage(25.2%)and number of species(5 per plot)of the vegetation on ridges was due to serious soil *** curvature and slope aspect were the first and second most important topographic factors,respectively,affecting the distribution of the *** relationship between topography and distribution could be described by a linear *** curvature or slope aspect alone,however,could only explain 22.2-59.2%of the variance in *** adaptation of vegetation to specific topographies should be considered for restorations of *** forests in the study *** results of this study will be helpful for selecting potential sites for seeding and vegetation restoration to improve the ecology of the study *** studies will be needed to identify the mechanism of the distribution of the understory vegetation in these *** forests.

关键词： Understory vegetation Topography,Soil erosion Pinus massoniana forest Eroded red-soil area

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Population Evolution of Oxide Inclusions in Ti-stabilized Ultra-low Carbon Steels after Deoxidation

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Journal of Iron and Steel Research International 2015年第12期22卷 1069-1077页

作者： Wen YANG Ying ZHANG Li-feng ZHANG Hao-jian duan Li WANG State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Mechanical Engineering University of Science and Technology Beijing

Population density function （PDF）, which can eliminate the arbitrariness caused by the choice of the num- ber and the size of bins compared to the well-used histograms, was introduced to analyze the amount of inclusions. The population evolution of oxide inclusions in forms of PDF in Ti-stabilized ultra-low carbon steels after deoxidation during industrial RH refining and continuous casting processes was analyzed using an automated SEM-EDS system. It was found that after deoxidation till the early stage of casting, the alumina inclusions exhibited a lognormal PDF distribution, and three factors including the existence of a large amount of alumina clusters, the generation of alumi- na from the reduction of Al-Ti-O inclusions and the reoxidation of molten steel were estimated as the reasons. The shape parameter σ was high after deoxidation and then decreased after Ti treatment, indicating that in a short period after deoxidation, the size of alumina inclusions was widely distributed. After Ti treatment, the distribution of inclu- sion size was more concentrated. The scale parameter m decreased with time during the whole refining process, indi- cating that the proportion of large inclusions decreased during refining. Contrarily, the Al-Ti-O inclusions presented a fractal PDF distribution except at the end of casting with fractal dimension D of 4.3, and the constant of propor- tionality C decreased with time during RH refining and increased during casting process. The reoxidation of steel by slag entrapped from ladle was considered as the reason for the lognormal PDF behavior of Al-Ti-O inclusions at the end of casting.

关键词： non-metallic inclusion population density function titanium treatment ultra-low carbon steel reoxidation

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Rigid elliptical cross-section ogive-nose projectiles penetration into concrete targets

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Defence Technology（防务技术） 2021年第3期17卷 800-811页

作者： Xiang-hui Dai Ke-hui Wang Ming-rui Li jian duan Bing-wen Qian Gang Zhou Laboratory of Intense Dynamic Loading and Effect Northwest Institute of Nuclear TechnologyXi’anShaanxi710024PR China

The elliptical cross-section ogive-nose projectile(ECOP) has recently attracted attention because it is well suited to the flattened shape of earth-penetrating weapons. However, the penetration performance of ECOPs has not been completely understood. The objective of this study was to investigate the penetration performance of ECOPs into concrete targets using a theoretical method. A general geometric model of ECOPs was introduced, and closed-form penetration equations were derived according to the dynamic cavity-expansion theory. The model was validated by comparing the predicted penetration depths with test data, and the maximum deviation was 15.8%. The increment in the penetration depth of the ECOP was evaluated using the proposed model, and the effect of the majoreminor axis ratio on the increment was examined. Additionally, the mechanism of the penetration-depth increment was investigated with respect to the caliber radius head, axial stress, and resistance.

关键词： Elliptical cross-section Projectile Penetration Concrete target Dynamic cavity-expansion

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