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Optimization of iron ore blending based on replacing Australian low alumina limonite

Journal of Iron and Steel Research International 2023年第9期30卷 1675-1686页

作者： Bin li Heng Zhou jian Huang Zong-wang zhang Xue-feng She jian-fang Wang Sheng-li Wu Ming-yin Kou State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Shougang Jingtang Iron and Steel Co. Ltd.Tangshan 063200HebeiChina Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education School of Automation and Electrical EngineeringUniversity of Science and Technology BeijingBeijing 100083China Delong Iron and Steel Co. Ltd.Xingtai 054009HebeiChina

Mauritanian iron ore powder(OM)has advantages of high iron grade,low aluminum content,and low loss on ignition,which can be used as a new mineral to replace low alumina limonite that has been exhausted in ***,it will have a certain negative impact on sintering because of its high SiO_(2) *** mechanism of SiO_(2) content affecting the sintering behavior was first studied through FactSage ***,the liquid fluidity,penetration,and high-temperature performance of different iron ore powders were ***,the optimization of ore blending structure was studied by the micro-sintering method and the sinter pot *** results show that the increase in SiO_(2) content can reduce the assimilation *** low penetration of OM can lead to an increase in the amount of liquid,and the high SiO_(2) content of OM increases the viscosity of the liquid *** is more,the increase in SiO_(2) also increases the formation of silicate and fayalite phase and inhibits the formation of silico-ferrite of calcium and aluminum(SFCA).To optimize ore blending structure,OM and the low SiO_(2) powder OD from Australia were used together,which improves the content of SFCA by 2.04%and decreases the contents of calcium silicate and fayalite by 0.63%and 4.99%,*** results of the sinter pot test indicated that the properties of sinter have been improved.

关键词： Mauritanian iron ore powder liquid fluidity Penetration Mineral composition Sintering Ore blending Low alumina limonite

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Syntheses and Structural Researches of Yb^(3+) Complexes with Nitrilotriacetic Acids──Nine-coordinate K_3[Yb(nta)_2(H_2O)]·5H_2O and Eight-coordinate Na_3[Yb(nta)_2]·6H_2O Complexes

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Chemical Research in Chinese Universities 2003年第2期19卷 145-150页

作者： WANG Jun zhang Xiang dong JIA Wei guo li Hui fang Department of Chemistry Liaoning UniversityShenyang 110036P.R.China

Yb 3+ complexes with two nitrilotriacetic acid molecules were prepared and their compositions were determined as K 3[Yb(nta) 2(H 2O)]·5H 2O and Na 3[Yb(nta) 2]·6H 2O by elemental analyses. Their structures were characterized by single crystal X ray diffraction analyses. In complex K 3[Yb(nta) 2(H 2O)]·5H 2O, the YbN 2O 7 part forms a nine coordinate monocapped square antiprismatic structure. In complex Na 3[Yb(nta) 2]·6H 2O, the YbN 2O 6 part forms an eight coordinate square antiprismatic structure. It can be seen that the outer cations (K + and Na +) greatly affect the coordination number and coordinate structure from these results.

关键词： Yb^(3+) complex Nitrilotriacetic acid Crystal structure

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Chaotic Solitons in Deoxyribonucleic Acid (DNA) Interacting with a Plane Wave

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Communications in Theoretical Physics 2001年第10期36卷 503-508页

作者： HAI Wen-Hua XIAO Yi fang jian-Shu zhang Xi-li HUANG Wei-li Department of Physics Hunan Normal University Changsha 410081 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Hunan Normal University Changsha 410081 China Department of Physics Hunan Normal University Changsha 410081 China Department of Physics Hunan Normal University Changsha 410081 China

Theoretical analysis of the DNA dynamics reveals that interaction between the single solitons and plane wave implies Smale-horseshoe chaos in the double helices. Solutions of the chaotic solitons are derived from a direct perturbation technique. It is demonstrated that to produce the bounded chaotic solitons, velocities of the solit ons nust be the same and equal to propagation velocity of the plane wave in DNA. The result shows that the DNA structure may be destroyed by the long action of an electromagnetic wave. It also supplies a useful method for controlling the velocities and unboundedness of the DNA motion in a tumour cell by using a plane wave.

关键词： chaos, soliton, deoxyribonucleic acid, plane wave, interaction

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Kinetic triplet from low-temperature carburization and carbon deposition reactions

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Journal of Iron and Steel Research International 2022年第10期29卷 1545-1558页

作者： Wei zhang Kui li jian-hong dong Cheng-zhi li Ai-hua liu Ju-hua zhang Zheng-liang Xue The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hanshan Normal University Chaozhou521041GuangdongChina Key Laboratory of Ecological Utilization of Multi-Metallic Mineral of Education Ministry Northeastern UniversityShenyang110819LiaoningChina

Carbon deposition reaction is unfavorable for smooth operation of blast furnace,while the product of carburization reaction is a superior iron-bearing raw material in non-blast furnace *** kinetic triplet of these two reactions was obtained based on non-isothermal kinetic *** to the Sharp–Wentworth method,the activation energy of the carburization reaction is 397.77 kJ/mol,and the activation energies of the carbon depositions on hematite and magnetite are 188.92 and 100.89 kJ/mol,*** carburization reaction is controlled by the Jander mechanism,and the carbon depositions on hematite and magnetite are both controlled by the mechanism of Zhuravlev–Lesokhin–*** on Coats–Redfern method,the activation energies of the above three reactions are 360.65,149.29,and 102.36 kJ/mol,*** carburization reaction is a first-order reaction,while the carbon depositions on hematite and magnetite are both third-order *** particular,the negative activation energy is obtained if considering the anti-Arrhenius circumstance in the Sharp-Wentworth *** on above results,it is feasible to adopt non-isothermal kinetic method to study the kinetic triplet of a *** to the obtained activation energies and reaction mechanism functions,the simulated kinetic data are in good agreement with the experimental values even using the negative activation energy.

关键词： Kinetic triplet Carburization reaction Carbon deposition Non-isothermal kinetic Magnetite Hematite

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Towards adaptable synchrotron image restoration pipeline

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Nuclear Science and Techniques 2024年第10期35卷 4-16页

作者： Chun li Xiao-Xue Bi Yu-Jun zhang Zhen zhang li-Wen Wang jian Zhuang dong-liang Chen Yu-Hui dong Yi zhang Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Synchrotron microscopic data commonly suffer from poor image quality with degraded resolution incurred by instrumentation defects or experimental *** restoration methods are often applied to recover the reduced resolution,providing improved image details that can greatly facilitate scientific *** these methods,deconvolution techniques are straightforward,yet either require known prior information or struggle to tackle large experimental *** learning(DL)-based super-resolution(SR)methods handle large data well,however data scarcity and model generalizability are *** addition,current image restoration methods are mostly offline and inefficient for many beamlines where high data volumes and data complexity issues are *** overcome these limitations,an online image-restoration pipeline that adaptably selects suitable algorithms and models from a method repertoire is *** this study,using both deconvolution and pretrained DL-based SR models,we show that different restoration efficacies can be achieved on different types of synchrotron experimental *** describe the necessity,feasibility,and significance of constructing such an image-restoration pipeline for future synchrotron experiments.

关键词： Synchrotron Deconvolution Deep learning Super-resolution Pipeline

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Efficiency enhancement of P3HT:PCBM polymer solar cells using oligomers DH4T as the third component

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Science China Chemistry 2015年第7期58卷 1169-1175页

作者： Ping Fu dong Yang Fujun zhang Wei Yu jian zhang Can li State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences and Dalian National Laboratory for Clean Energy Key Laboratory of Luminescence and Optical Information Ministry of Education University of Chinese Academy of Sciences

We assembled a ternary blend bulk heterojunction polymer solar cell(PSCs) containing P3HT(donor) and PC61BM(acceptor) incorporated with a small molecule oligomer, dihexyl-quaterthiophene(DH4T) as a third component. By optimizing the contents of DH4 T, we increased the power conversion efficiency of ternary P3HT:DH4T:PC61BM PSCs to 4.17% from 3.44% of binary P3HT:PC61BM PSCs under AM 1.5 G of 100 m W/cm2 intensity. The major improvement is from the increase of the short circuit current and fill factor that is due to the increased light absorption at short wavelength, the balanced charge carrier transportation and the enhanced hole evacuation by a DH4T-enriched layer at the anode interface. In this work, we demonstrated that the efficiency of the PSCs can be enhanced by using low-bandgap conjugated polymer and its oligomer as donors and fullerene derivatives as acceptors.

关键词： ternary polymer solar cells P3HT:PC61BM oligomer mobility balanced charge carrier transportation

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Effect of feeding parameters on ingot segregation and shrinkage pore in vacuum arc remelting

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Journal of Iron and Steel Research International 2023年第6期30卷 1268-1278页

作者： dong-bin jiang Fu-zhong Yang jian zhang Yang Zhou li-feng zhang School of Metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Chengdu 610303SichuanChina School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The feeding parameters in the final stage of vacuum arc remelting process obviously affect the solute segregation and shrinkage pore *** with the electromagnetic field,fluid flow,and solute transport,a numerical model was built to investigate the effect of feeding parameters on the ingot solidification *** Nb segregation and shrinkage pore depth in the solidified ingot were *** results show that the liquid moves along the solidification front and the vertex flow is formed in the liquid pool,which promotes solute *** the solidified ingot,the Nb segregation in the lower part is negative,while that in the upper part is *** the differential electrode applied,the positive segregation is slightly reduced but the segregation distribution remains *** the feeding current decreases,the positive segregation zone moves toward the ingot top surface,due to the final solidification position moving *** the feeding time extended,the positive segregation moves to the top surface and the shrinkage pore depth is *** the feeding time is set at 12 min,the shrinkage pore depth can be reduced to 21 mm.

关键词： Vacuum arc remelting Feeding parameter Macrosegregation Shrinkage pore Solidification

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Thermal, Mechanical and Rheological Properties of Eco-friendly Poly(propylene carbonate)/Poly(1,2-propylene succinate) Blends

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Chinese Journal of Polymer Science 2014年第7期32卷 914-922页

作者： Dan-dan Wu Wu li Hong-yu liang San-rong liu jian-yong fang 张会良 Hui-xuan zhang li-song dong Changchun University of Technology Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied Chemistry

In order to improve the flexibility of poly（propylene carbonate）（PPC）, poly（1,2-propylene succinate）（PPSu） was used to plasticize PPC in a batch mixer. The effects of PPSu on the miscibility, thermal stability, mechanical and theological properties of the blends were investigated. PPC was partially miscible with PPSu. It was demonstrated that PPSu decreased the glass transition temperature and melt viscosity of PPC, as shown in the DSC and rheological curves. With the increase in PPSu content, the PPC/PPSu blends showed decreased tensile strength, however, the elongation at break was increased to 1100% for the 70/30 PPC/PPSu blend. The introduction of PPSu provided an efficient and novel plasticization method to extend the application area of PPC.

关键词： Biodegradable Poly(propylene carbonate) Poly(1,2-propylene succinate) Miscibility Blends.

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Long-term thermal-aging stability of oxide-dispersion-strengthened ferritic steels at 753 K

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Journal of Iron and Steel Research International 2018年第7期25卷 776-784页

作者： Shuai Xu zhang-jian Zhou Shao-fu li Hao-dong Jia School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Oxide-dispersion-strengthened （ODS） ferritic steels are promising candidates for structural applications in the future nuclear reactors. The higher chromium contents of ODS ferritic steels, the better the corrosion resistance, which can meet the harsh corrosion environment of the advanced reactors. However, increasing the Cr content may also lead to the brittleness of the ODS steels when serving at high temperatures. The ODS ferritic steels with different Cr contents （12, 16 and 18 wt% Cr, respectively） were fabricated by mechanical alloying, hot isostatic pressing and forging. Mechanical properties and microstructure evolution of the ODS ferritic steels after aging at 753 K for 2000 h were investigated. It is found that both Vickers hardness and yield strength of 18%Cr ODS ferritic steel were strongly increased and the impact energy was decreased after aging at 753 K. In order to explore the reasons for changes in the mechanical properties, the fracture surfaces were characterized by scanning electron microscopy, and microstructures after aging were observed by transmission electron microscopy. The impact fracture of 18%Cr ODS ferritic steel belongs to quasi-cleavage facture, which is consistent with its very low impact energy. The grain size and dispersed oxide particles of different ODS steels are very stable. M23C6 carbide and M2C carbide were found in 12%Cr ODS steel and 16%Cr ODS steels, respectively.

关键词： Oxide-dispersion-strengthened ferritic steel Aging stability - Mechanical property Microstructure

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云南省淡水螺广州管圆线虫感染情况调查分析

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动物医学进展 2025年第1期46卷 123-128页

作者：董路段博芳杨建发杨红梅李坤马洲董星和李永华邹丰才云南省动物疫病预防控制中心云南昆明650201 云南农业大学动物医学院云南昆明650201 景洪市勐龙镇农业农村发展服务中心云南景洪666112 保山市动物卫生监督所云南保山678000 武定县动物疫病预防控制中心云南武定651600

为了查明云南省淡水螺广州管圆线虫感染情况和分布特点,从野外和农贸市场采集5种螺共4502份,取其肌肉用组织压片法镜检广州管圆线虫幼虫,再提取组织DNA,采用PCR扩增广州管圆线虫ITS基因。镜检发现,在福寿螺中发现广州管圆线虫第Ⅲ期幼虫... 详细信息

为了查明云南省淡水螺广州管圆线虫感染情况和分布特点,从野外和农贸市场采集5种螺共4502份,取其肌肉用组织压片法镜检广州管圆线虫幼虫,再提取组织DNA,采用PCR扩增广州管圆线虫ITS基因。镜检发现,在福寿螺中发现广州管圆线虫第Ⅲ期幼虫;PCR扩增显示:5份样品为广州管圆线虫阳性,总阳性率为0.111%(5/4502);不同地区间,昆明市阳性率最高(0.231%,4/1734),德宏州(0.221%,1/453)次之;不同淡水螺种类中,福寿螺阳性率为0.192%(4/2081),环棱螺阳性率为0.160%(1/624),其余3种螺未检出;不同采样环境下,农贸市场阳性率为0.192%(4/2083),野外环境阳性率为0.041%(1/2419)。不同螺种类和采样环境感染率有统计学意义(P<0.05)。研究结果获悉了云南省部分淡水螺广州管圆线虫的感染情况,为云南省广州管圆线虫病的防控提供了重要基础数据。

关键词：淡水螺广州管圆线虫 ITS基因感染

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