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Acta Metallurgica Sinica(English Letters) 2013年第3期26卷 293-298页

作者： Renguo GUAN Zhanyong ZHAO Xiang WANG Chunguang DAI chunming liu School of Materials and Metallurgy Northeastern University

A novel continuous semisolid rolling process for producing AZ31 alloy strip was developed. The process parameters were optimized, and microstructure and properties of AZ31 alloy prepared by the process were studied. The results reveal that primary grains of the strip become coarse, and the grain structure transforms from round shape to dendrite with the increment of casting temperature gradually. Eutectic phase fraction and primary grain size increase with the increment of roll speed. The primary grain size decreases firstly and then increases with the increment of the vibration frequency correspondingly. When the casting temperature is from 650℃to 690℃, the roll speed is 0.069 m·s- 1, and the vibration frequency is about 80 Hz, AZ31 alloy strip with a cross section size of 4 mm×160 mm was prepared by the proposed process. The ultimate tensile strength and elongation are improved 1% and 57 %, respectively.

关键词： Semisolid Sloping plate Rolling AZ31 alloy Microstructure Property

Enhancing the bake-hardening responses of a pre-aged Al-Mg-Si alloy by trace Sn additions

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Journal of Materials Science & Technology 2020年第5期40卷 107-112页

作者： Gang Lu Shuai Nie Jianjun Wang Ying Zhang Tianhai Wu Yujie liu chunming liu Key Laboratory for Anisotropy and Texture of Materials(MoE) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China Shenyang Industrial Transformation Upgrading Promotion Center Shenyang 110083China

Effects of additions of trace Sn on the bake-hardening responses of a pre-aged Al-0.85 Mg-0.85 Si(in wt%)alloy were investigated through mechanical tests,differential scanning calorimetry,electrical resistivity and transmission electron *** indicate that trace Sn additions reduced the number density of pre-aging clusters by inhibiting the formation of unstable counterpart during pre-aging treatment,leading to low strength and high supersaturation of solute *** a subsequent paint-bake treatment,the presence of highly supersaturated solute atoms and high concentrated free vacancies moderated the activation energy barrier ofβ’’phase and thus kinetically accelerated the formation ofβ’’.Consequently,the trace Sn additions enhanced the bake-hardening responses of the pre-aged alloys *** Sn-containing pre-aged Al-Mg-Si alloys with low strength and great bake-hardening responses hold promising potential for automotive body skin applications.

关键词： Al-Mg-Si alloy Pre-aging Trace Sn Bake-hardening responses Precipitation kinetics

Low complexity Chase-2 decoding of concatenated codes

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Chinese Science Bulletin 2010年第26期55卷 3066-3070页

作者： liu XiaoJian ZHAO chunming SUN XiaoJun National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

The concatenated codes are widely used in current communication systems, such as satellite communication systems and WiMAX system. The objective of this study was to present a low complexity iterative soft decoding algorithm for concatenated codes. The concatenation was between a Reed-Solomon (RS) code and recursive systematic convolutional (RSC) code. The reduction in computational complexity was achieved by simplifying the Chase-2 decoder for RS codes with limited usage of test patterns. The processing of soft information between inner and outer decoders was also discussed. Simulation results showed that the proposed algorithm could achieve a good trade-off between complexity and performance.

关键词：级联码大通卫星通信系统计算复杂性译码解码算法低复杂度限制使用

Hierarchical strain band formation and mechanical behavior of a heterostructured dual-phase material

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Journal of Materials Science & Technology 2023年第31期162卷 25-37页

作者： Zhongkai Li Yujie liu Yanfei Wang Jun Hu Lei Xu Jianjun Wang chunming liu Yuntian Zhu Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education Northeastern UniversityShenyang 110819China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Materials Science and Engineering City University of Hong KongHong KongChina

Dispersive strain bands have been reported as a characteristic deformation feature of heterostructured materials,which helps to improve ***,their formation mechanism is still not well *** we report the formation of dispersed strain bands through dual-level hierarchical strain banding and its effect on the mechanical behavior of a heterostructured Fe-40Cu model ***,deformation started by the formation and propagation of dispersed microscale strain bands in the heterostructured Fe-40Cu *** strain gradient was generated within the microscale strain bands during their propagation and was accommodated by the accumulation of geometrically necessary disloca-tions(GNDs).The dispersed microscale strain bands were not uniformly distributed,but instead grouped together to form macroscale strain bands that were uniformly distributed over the entire gage section to accommodate the majority of the applied *** formation of this dual-level hierarchical strain bands prevented the formation of large strain localization to fail the sample *** was also found that increasing the strain hardening capacity of soft copper zones provides more room for the accumulation of GNDs,resulting in higher constraint to microscale strain band propagation and consequently higher *** observations suggest the possibility of tailoring microscale strain bands to optimize tensile performance of heterostructured materials.

关键词： Heterostructured materials Strain bands Strain gradient Hetero-deformation induced hardening

Separator Material Chosen for MH/Ni Battery

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Journal of Rare Earths 2004年第z1期22卷 349-351页

作者： Xu Shaoping Ma Yijun Liang Wanlong liu Dong Jia chunming Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd. Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China Inner Mongolia Rare Earth Ovonic High-Power MH/Ni Battery Co. Ltd.Baotou 014030 China

The properties of MH/Ni batteries using different separator were *** then an idea for choosing separator for high-power MH/Ni battery was *** the separator with grafting treatment, the storage characteristic, charge retention characteristic and anti-soft-short characteristic of high-power MH/Ni battery are *** and spunfibre material meet different properties requirement of battery.

关键词： separator material properties of battery storage characteristic

综合地球物理方法在含稀有元素煤系地层勘探中的应用--以新疆温宿县巴依里煤矿为例

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资源信息与工程 2024年第4期39卷 37-41页

作者：杜杭庭占航刘春明周炜鉴杨柳大地矿业发展(广东)有限公司广东清远511500 湖南工程职业技术学院湖南长沙410151 湖南省矿山固碳增汇工程技术研究中心湖南长沙410151 有色金属成矿预测与地质环境监测教育部重点实验室(中南大学) 湖南长沙410083 中南大学地球科学与信息物理学院湖南长沙410083

新疆温宿县天山南麓煤系地层中稀土元素(REE)和镓元素(Ga)具有良好的利用前景。本文以巴依里煤矿为研究对象,通过开展综合地球物理勘探,初步确定了含煤岩系地层深部延伸情况与展布特征,为后续稀有金属勘查工作主要靶区的圈定提供了理论... 详细信息

新疆温宿县天山南麓煤系地层中稀土元素(REE)和镓元素(Ga)具有良好的利用前景。本文以巴依里煤矿为研究对象,通过开展综合地球物理勘探,初步确定了含煤岩系地层深部延伸情况与展布特征,为后续稀有金属勘查工作主要靶区的圈定提供了理论与实践基础。

关键词：巴依里煤矿含煤岩系稀有金属综合地球物理勘探

Mechanical Properties and Corrosion Behavior of Multi-Microalloying Mg Alloys Prepared by Adding AlCoCrFeNi Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1301-1316页

作者： Xiong Zhou Qichi Le Chenglu Hu Ruizhen Guo Tong Wang chunming liu Dandan Li Xiaoqiang Li The Key Laboratory of Electromagnetic Processing of Materials Ministryof EducationNortheastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(MoE) School of Materials Scienceand EngineeringNortheastern UniversityShenyang 110819China

In this work,a series of multi-microalloying Mg alloys with a high degradation rate and high strength was prepared by adding AlCoCrFeNi HEA particles to the Mg melt followed by hot *** microstructure evolution and mechanical properties of the alloys were studied,meanwhile,the corrosion properties were evaluated by immersion weight loss and electrochemical *** indicated that HEA particles in the Mg melt were decomposed and formed the Ni-rich phase,which was distributed uniformly in the Mg *** with the pure Mg matrix,the Mg-3 HEA alloy exhibited excellent mechanical properties of the ultimate tensile strength~237 MPa and tensile yield strength~181 MPa,an increased rate of~49.1 and~96.7%,respectively,without sacrificing the *** the ultimate compressive strength(UCS)and compressive yield strength increased by~31.5 and~43%to 392±3 and 103±2 MPa,*** on theoretical analysis,the high YS of the alloys was mainly attributed to fine-grain strengthening and second phase ***,based on the study of corrosion behavior,it was found that with the increase in HEA particle content,the degradation rate of the composites increased because of the promotion of micro-galvanic corrosion,and the Mg-3 HEA alloy showed a maximum degradation rate of~25.2 mg cmh.

关键词： AlCoCrFeNi HEA Pure Mg Mechanical properties Corrosion behavior

Infrared and Visible Image Fusion Based on Res2Net-Transformer Automatic Encoding and Decoding

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Computers, Materials & Continua 2024年第4期79卷 1441-1461页

作者： chunming Wu Wukai liu Xin Ma Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology School of Electrical EngineeringNortheast Electric Power UniversityJilin132012China School of Electrical Engineering Northeast Electric Power UniversityJilin132012China School of Aeronautical Engineering Jilin Institute of Chemical TechnologyJilin132022China

A novel image fusion network framework with an autonomous encoder and decoder is suggested to increase thevisual impression of fused images by improving the quality of infrared and visible light picture fusion. The networkcomprises an encoder module, fusion layer, decoder module, and edge improvementmodule. The encoder moduleutilizes an enhanced Inception module for shallow feature extraction, then combines Res2Net and Transformerto achieve deep-level co-extraction of local and global features from the original picture. An edge enhancementmodule (EEM) is created to extract significant edge features. A modal maximum difference fusion strategy isintroduced to enhance the adaptive representation of information in various regions of the source image, therebyenhancing the contrast of the fused image. The encoder and the EEM module extract features, which are thencombined in the fusion layer to create a fused picture using the decoder. Three datasets were chosen to test thealgorithmproposed in this paper. The results of the experiments demonstrate that the network effectively preservesbackground and detail information in both infrared and visible images, yielding superior outcomes in subjectiveand objective evaluations.

关键词： Image fusion Res2Net-Transformer infrared image visible image

TATA-box binding protein-associated factor 2 regulates grain size in rice

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The Crop Journal 2023年第2期11卷 438-446页

作者： Ling Jiang Ning Jiang Zejun Hu Xuejun Sun Xian Xiang Yahui liu Mingwei Wu chunming liu Xiaojin Luo Key Laboratory of Plant Molecular Physiology Institute of BotanyChinese Academy of SciencesBeijing 100093China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Genetic Engineering and MOE Engineering Research Center of Gene Technology School of Life SciencesFudan UniversityShanghai 200438China School of Advanced Agricultural Sciences Peking UniversityBeijing 100871China

Grain size,characterized by a combination of grain length,width,and thickness,is one of the major determinants of yield in *** present study identified TATA-box binding protein-associated factor 2(TAF2)as an essential component regulating transcription and determining grain size in ***-based cloning showed that a G/T substitution in TAF2 resulted in a naturally occurring mutant called reduced grain size and plant height 1(rgh1).The mutants,with weak edited rgh1 alleles,exhibited a small grain phenotype with reduced grain length and width,while the severe knockout mutant(rgh1-2s)was dwarf and completely *** test performed between rgh1 and several edited alleles confirmed that the mutation in TAF2 caused the rgh1 *** staining showed that TAF2 was mainly expressed in the vascular bundles of roots,stems,leaves,and *** cytological analysis revealed that reduced cell division in the glumes resulted in the small grain phenotype of *** RNA-sequencing detected altered expression of genes involved in the basic biological processes in rgh1 *** findings provide novel insights into the TAF2-mediated genetic mechanism regulating grain size in rice.

关键词： Grain size TAF2 RGH1 Cell division Rice

Boundary Layer Distributions and Cooling Rate of Cooling Sloping Plate Process

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Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 701-705页

作者：赵占勇管仁国 WANG Xiang HUANG Hongqian CHAO Runze DONG Lei liu chunming College of Materials and Metallurgy Northeastern University

According to the principle of grain refining and slurry preparation by cooling sloping plate process, the distributions of boundary layers during melt treatment by cooling sloping plate were studied, and mathematic model of cooling rate was established. The calculation value approximately agrees with the experimental result. Laminar flow and turbulent flow exist on sloping plate surface commonly. The thickness of velocity boundary layer and the critical transfer distance from laminar flow to turbulent flow increase with the decrease of initial flow velocity. The thickness of temperature boundary layer increases with the increment of flow distance and the decrease of initial flow velocity. The melt cooling rate and melt thickness have an inverse proportion relationship. The melt cooling rate increases along the plate direction gradually when the initial flow velocity is lower than 1 m/s, the melt cooling rate keeps nearly a constant when the initial flow velocity is 1 m/ s, when the initial flow velocity is higher than 1 m/s, the melt cooling rate decreases gradually. The melt cooling rate of cooling sloping plate process can reach 102-103 K/s and belongs to meta-rapid solidification scope.

关键词： semisolid grain refining sloping plate temperature boundary layer cooling rate