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Control of Equiaxed Crystal Ratio of High Carbon Steel Billets by Circular Seam Cooling Nozzle

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Journal of Iron and Steel Research International 2011年第2期18卷 24-30页

作者： LI Pei-song lu jun-hui QIU Sheng-tao WANG Zhong-ying ZHAO Pei Northeastern University Shenyang 110004 Liaoning China State Key Laboratory of Advanced Steel Processing and Products Central Iron and Steel Research Institute Beijing 100081 China

A circular seam cooling nozzle and its online control system have been developed to reduce the center segregation in high carbon steel billets by decreasing the superheat of the molten steel and improving the equiaxed crystal ratio based on the numerical results. An industrial experiment has been carried out on a 150 mm× 150 mm caster to investigate the effect of the circular seam cooling nozzle on the superheat removal of the molten steel. The results show that the circular seam cooling nozzle can be used to control the casting temperature in a closed loop control system. The online control system can be effectively adapted to the variation of operating parameters. The casting lasts about 4 h and about 400 t steel is successfully produced in a continuous operation. The removal of about 14 ℃ superheat and the improvement of approximate 10% equiaxed crystal ratio can be achieved by the newly developed circular seam cooling nozzle.

关键词： circular seam cooling nozzle high equiaxed crystal ratio billet low superheat

Prediction of miRNA Based on miRNA Biogenesis via One-class SVM

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Chemical Research in Chinese Universities 2010年第5期26卷 803-809页

作者： LIU Yuan-ning YAN Wen ZHANG Hao LI Zhi lu hui-jun LI Xin College of Computer Science and Technology Symbol Computation and Knowledge Engineering of Ministry of Education Jilin University Changehun 130012 P. R. China Institute of Military Veterinary Academy of Military Medical Sciences Changchun 130012 P. R. China Changchun University of Science ＆ Technology Changchun 130022 P. R. China

MicroRNAs are a class of small, single-stranded RNAs which are produced by non-protein-coding RNA genes with a length of 21-29 nt. They regulate the expression of protein-encoding genes at the post-transcriptional level and the degradation ofmRNAs by base pairing to mRNAs. Mature miRNAs are processed from 60-90 nt RNA hairpin structures called pre-miRNAs. At present, most of the machine learning computational methods for pre-miRNAs prediction are based on two-class SVM and use structural information of pre-miRNA hairpins. Those methods share a common feature that all of them need a negative dataset in the training dataset and feature selection in both training and testing dataset. In order to avoid selecting false negative examples of miRNA hairpins in the training dataset which may mislead the classifiers, we presented a microRNA prediction algorithm called MirBio based on miRNAs Biogenesis which is trained only on the information of the positive miRNAs class to predict miRNAs. It can predict both pre-miRNAs and miRNAs and get a relatively satisfying result in this study.

关键词： miRNAs Hairpin One-class classification miRNAs Biogenesis

Phase field modeling of grain stability of nanocrystalline alloys by explicitly incorporating mismatch strain

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Rare Metals 2024年第7期43卷 3370-3382页

作者： Min Zhou Hong-hui Wu Yuan Wu hui Wang Xiong-jun Liu Sui-He Jiang Xiao-Bin Zhang Zhao-Ping lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083Cnina Institute for Carbon Neutrality University of Science and TechnologyBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) ***,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline *** experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline *** this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline *** simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline *** synergizing precipitation with an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the *** concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain *** findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.

关键词： Phase field model Mismatch strain Second-phase precipitation Grain boundary segregation Nanocrystalline alloys

On the Monge–Kantorovich Mass Transfer Problem in Higher Dimensions

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1989-2004页

作者： Xiao jun lu School of Mathematics Southeast UniversityNanjing 210096P.R.China

This paper mainly investigates the approximation of a global maximizer of the Monge–Kantorovich mass transfer problem in higher dimensions through the approach of nonlinear partial differential equations with Dirichlet *** an approximation mechanism,the primal maximization problem can be transformed into a sequence of minimization *** applying the systematic canonical duality theory,one is able to derive a sequence of analytic solutions for the minimization *** the final analysis,the convergence of the sequence to an analytical global maximizer of the primal Monge–Kantorovich problem will be demonstrated.

关键词： Monge-Kantorovich mass transfer singular variational problem canonical duality theory

Bullet migration from the knee to the heart after a gunshot injury： a case report

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Chinese Medical Journal 2011年第10期124卷 1590-1592页

作者： lu Xiao-hui lu Zhi-jun HU jun SONG Jian-xin CHEN Shun-liang Department of Orthopedics the First University Hospital ShantouUniversity Shantou Guangdong 515041 China

Migration of a bullet to a distant part of the body after a gunshot is rarely observed in the clinical setting, and migration to the heart is even *** are usually no clear symptoms or signs from migration of a *** bullet can be easily missed and sometimes identified in a review examination.A case of bullet migration to the heart 2 months after a gunshot to the left knee was reported.

关键词： Bullet migration from the knee to the heart after a gunshot injury: a case report

Preparation of(lu,Y)_(3)(Al,Sc,Cr)_(2)Al_(3)O_(12)phosphor ceramics with high thermal stability for near-infrared LED/LD

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Journal of Advanced Ceramics 2024年第3期13卷 354-363页

作者： Yuelong Ma Xingcan Li Lan Wu Chenyang Shao Boqiang Zhang Tao Pang Lili lu hui Qiu Ye Tian Guilu Wang Yanbo hui Qianwen Guo Daqin Chen School of Mechanical and Electrical Engineering Henan University of TechnologyZhengzhou 450001China Huzhou Key Laboratory of Materials for Energy Conversion and Storage College of ScienceHuzhou UniversityHuzhou 313000China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China SongShan Laboratory Zhengzhou 450046China College of Food Science and Engineering Henan University of TechnologyZhengzhou 450046China School of Mechanical Engineering Zhengzhou University of Science and TechnologyZhengzhou 450064China

Near-infrared(NIR)phosphor-converted light-emitting diodes/laser diodes(LEDs/LDs)are prospective lighting sources for NIR ***,developing NIR phosphor materials with desired thermal robustness and high photoelectric efficiency is a crucial challenge for their *** this work,based on the cationic radius matching effect,a series of(lu,Y)_(3)(Al,Sc,Cr)_(2)Al_(3)O_(12)NIR phosphor ceramics(luYScCr NIR-PCs)were fabricated by vacuum *** thermal stability(95%@150℃)was obtained in the prepared NIR-PCs,owing to their weak electron-phonon coupling effect(small Huang-Rhys factor).Being excited at 460 nm,NIR-PCs realized a broadband emission(650-850 nm)with internal quantum efficiency(IQE)of 60.68%.Combining NIR-PCs with LED/LD chips,the maximum output power of the encapsulated LED prototype was 447 mW@300 mA with photoelectric efficiency of as high as 18.6%@180 mA,and the maximum output power of the LD prototype was 814 mW@2.5 *** working temperatures of NIR-PCs were 70.8℃@300 mA(LED)and 102.8℃@3 A(LD).Finally,the prepared NIR-PCs applied in food detection were verified in this study,demonstrating their anticipated application prospects in the future.

关键词： thermal stability electron phonon coupling effect photoelectric efficiency near-infrared phosphor ceramics(NIR-PCs) NIR light-emitting diode/laser diode(LED/LD)prototype

From non-carbon host toward carbon-free lithium-sulfur batteries

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Nano Research 2024年第3期17卷 1337-1365页

作者： Yanqi Feng hui Liu Qiongqiong lu School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China Institute of Materials Henan Key Laboratory of Advanced Conductor MaterialsHenan Academy of SciencesZhengzhou 450046China Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.V. Helmholtzstraβe 2001069 DresdenGermany School of Materials&Environment Engineering Chengdu Technological UniversityChengdu 611730China

Lithium-sulfur(Li-S)batteries with advantages of high energy densities(2600 Wh·kg^(-1)/2800 Wh·L^(-1))and sulfur abundance are regarded as promising candidates for next-generation high-energy ***,the conventional carbon host used in sulfur cathodes suffers from poor chemical adsorption towards Li-polysulfides(LPS)in liquid electrolyte and sluggish redox kinetics,leading to low capacity and rate ***,carbon host used in Li metal anode with the intrinsic property of poor lithiophilicity and high Li-nucleation barrier gives rise to uncontrollable dendrite growth and further battery ***,non-carbon hosts with chemical adsorption toward LPS and catalytic activity for accelerating LPS redox conversion as well as lithiophilic property for guiding uniform Li deposition are proposed and demonstrated a high efficiency in both sulfur cathodes and Li metal *** this review,the principle and challenges of Li-S batteries are first presented,then recent work using non-carbon hosts in Li-S batteries is summarized comprehensively,and the mechanism of non-carbon host in improving sulfur utilization and stabilizing Li metal anode is discussed in ***,remaining challenges and outlook on the implementation of non-carbon host for practical carbon-free Li-S batteries are also provided.

关键词： sulfur cathode Li metal anode polysulfides adsorption catalytic effect Li dendrite carbon-free lithium-sulfur batteries

MgO对包钢高炉渣流变特性及熔化性影响的实验研究

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包钢科技 2024年第3期50卷 14-21页

作者：冯聪李玉柱白晓光郑占斌于恒亮卢俊慧内蒙古包钢钢联股份有限公司技术中心内蒙古包头014010 内蒙古包钢钢联股份有限公司炼铁厂内蒙古包头014010

基于包钢高炉炼铁生产原燃料条件,在实验室条件下以包钢4#高炉渣为基础,采用纯化学试剂配制渣样,在N_(2)气氛下分析了MgO对包钢高炉渣流变特性的影响。同时,探索了MgO对包钢高炉渣熔化性能和热焓的影响。结果表明,实验条件下,炉渣MgO含... 详细信息

基于包钢高炉炼铁生产原燃料条件,在实验室条件下以包钢4#高炉渣为基础,采用纯化学试剂配制渣样,在N_(2)气氛下分析了MgO对包钢高炉渣流变特性的影响。同时,探索了MgO对包钢高炉渣熔化性能和热焓的影响。结果表明,实验条件下,炉渣MgO含量由8.00%升高至13.00%,包钢高炉渣熔化性温度呈升高趋势,黏度和黏流活化能呈先降低后升高的趋势,炉渣流动性和热稳定性先变好后变差。另外,随炉渣MgO含量升高,包钢高炉渣熔化性能特征温度呈先降低后升高趋势,炉渣热焓呈升高趋势,表明炉渣在高炉炉缸蓄热能力增强。综合考虑实验研究结果、相关理论计算及包钢现有高炉炉渣MgO含量控制水平,建议包钢高炉渣MgO含量控制为10.00%。

关键词：白云鄂博矿高炉渣 MgO 流变特性熔化性

Enlarged interlayer of separator coating enabling high-performance lithiumsulfur batteries

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 103-112页

作者： Yanqi Feng hui Liu Xiaoting Liu Qiongqiong lu School of Materials&Environment Engineering Chengdu Technological UniversityChengdu 611730China School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Institute of Materials Henan Key Laboratory of Advanced Conductor MaterialsHenan Academy of SciencesZhengzhou 450046China Leibniz Institute for Solid State and Materials Research(IFW) Dresden e.V.Dresden 01069Germany

Lithiumsulfur batteries have been intensively studied due to their high theoretical energy density and abundant sulfur resources. However, their commercial application is hindered by the low redox kinetics and high sulfur losses. In principle, in the design of cathodes and separators, the adsorption toward lithium-polysulfides should be enhanced and the conversion of soluble high-order lithium-polysulfides should be catalyzed. Herein, a KV_(3)O_(8)·0.75H_(2)O separator is designed as an effective lithium-polysulfides mediator in lithiumsulfur batteries. The intercalated K+ would enlarge the interlayer spacing of vanadium oxides, preventing the collapse of the layer structure and improving the electrical/ion conductivity of the interface. Moreover, the KV_(3)O_(8)·0.75H_(2)O modified separator possess a prior adsorption and high redox kinetics toward lithium-polysulfides due to the enhanced diffusion kinetics, which guarantees the high-rate capability and efficient utilization of sulfur. As a result, lithiumsulfur batteries exhibit a high capacity of 1362 mAh·g^(-1) and a long lifespan with a low capacity loss of 0.073% per cycle. This work may provide an alternative way to establish a functional separator to balance the adsorption and conversion of polysulfides during the redox back and forth.

关键词： lithium kinetics adsorption