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Journal of Wuhan University of Technology(Materials Science) 2015年第2期30卷 386-391页

作者：李大赵 WEI Yinghui SONG Jinlu hou lifeng School of Materials Scinece and Engineering North University of China School of Materials Scinece and Engineering Taiyuan university of technology

TWIP steels with 70% cold-rolled reduction were heated at 500, 600, 700, 800, 900, 1000, and 1100 ℃. Then, the properties before and after heating were examined through tensile and hardness experiments. The microstructures were also analyzed by optical microscopy and transmission electron microscopy. The relationship between the properties and microstructure was examined as well. Finally, the evolution process of cold-rolled microstructures during heating was discussed in detail. Moreover, some conclusions can be drawn, and the heating evolution characteristics are described.

关键词： TWIP steel cold rolled static recrystallization dislocation walls

Influence of Surface Nanocrystallization on Ti Ion Implantation of Pure Iron

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Journal of Materials Science & Technology 2015年第3期31卷 305-310页

作者： Xu Li Yanli An Yinghui Wei Huayun Du lifeng hou Chunli Guo Hongbo Qu Yide Wang College of Materials Science and Engineering Taiyuan University of Technology College of Base Medicine Shanxi Medical University Lüliang University Taiyuan Iron & Steel (Group) CO. LTD.

In order to increase the depth or concentration of Ti ion implantation of pure iron, the surface mechanical attrition treatment(SMAT), which can fabricate a nanometer-grained surface layer without porosity and contamination in a pure iron plate, was used before ion implantation. Ti ion was implanted into the SMA treated sample and coarse-grained counterpart by using a metal vapor vacuum arc source implanter. The changing of depth and concentration of Ti was studied in a function of implantation *** optical microscopy, transmission electron microscopy and X-ray diffraction, the grain size of the nano structured surface was studied. Micro-hardness, friction and wear behavior of nano surface layers were studied. By energy dispersive X-ray spectroscopy and Auger electron spectroscopy, the chemical composition and concentration of Ti ion in the surface implantation layer were studied. Experimental results showed that the concentration of Ti increased dramatically compared with untreated coarsegrained samples, which is attributed to the existence of higher density of defects(supersaturated vacancies, dislocations, non-equilibrium grain boundaries etc.) and compression stress field in the SMA treated nanocrystallined surface layer. The interaction between the defects and the implanted solute atoms leads to the increment of solid solubility. But the implantation depth showed inconspicuous change. It is shown that the ion range is just relevant to the energy and mass of the ion, dose of injection,the mass and density of target material.

关键词： Pure iron Surface mechanical attrition treatment I

Leap of Li Metal Anodes from Coin Cells to Pouch Cells:Challenges and Progress

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Electrochemical Energy Reviews 2023年第1期6卷 39-86页

作者： Qian Wang Tiantian Lu Yuanbin Xiao Jianyang Wu Lixiang Guan lifeng hou Huayun Du Huan Wei Xiaoda Liu Chengkai Yang Yinghui Wei Henghui Zhou Yan Yu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Corrosion and Protection Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Key Laboratory of Advanced Materials Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Li metal anodes have attracted tremendous attention in the last decade because of their high theoretical capacities and low electrochemical ***,until now,there has only been limited success in improving the interfacial and structural stabilities and in realizing the highly controllable and large-scale fabrication of this emerging material;these limitations have posed great obstacles to further performing fundamental and applied studies in Li metal *** this review,we focus on summarizing the existing challenges of Li metal anodes based on the leap from coin cells to pouch cells and on outlining typical methods for designing Li metal anodes on demand;we controllably engineer their surface protection layers and structure sizes by encapsulating structured Li metal inside a variety of synthetic protection *** aim to provide a comprehensive understanding and serve as a strategic guide for designing and fabricating practicable Li metal anodes for use in pouch *** and opportunities regarding this burgeoning field are critically evaluated at the end of this review.

关键词： Li metal anode Dendrites Pouch cells Air stability Energy density

风电功率波动平抑下储能出力与平滑能力的动态优化控制策略

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热力发电 2020年第8期49卷 134-142页

作者：侯力枫国网冀北电力公司承德公司河北承德067000

风电场并网处布置储能系统能改善并网经济性,平抑风电并网功率波动。然而,储能出力优化电网运行性能受储能系统的功率、容量和能量状态等诸多因素影响。本文引入储能电池出力能力指标,设计了保护储能电池和保障并网功率平衡能力的多目... 详细信息

风电场并网处布置储能系统能改善并网经济性,平抑风电并网功率波动。然而,储能出力优化电网运行性能受储能系统的功率、容量和能量状态等诸多因素影响。本文引入储能电池出力能力指标,设计了保护储能电池和保障并网功率平衡能力的多目标优化模型,提出一种基于储能荷电状态模糊动态调节的模型预测控制策略,在整体上保证储能出力最小水平,在局部储能高充/放电区域的时段内提高储能充/放电出力能力,并将本文方法与传统模型预测方法进行仿真对比。结果表明,在相同储能配置比例下,本文方法能有效平抑风电功率波动,综合指标均优于传统模型预测方法,在优化负荷功率波动的同时也提高了储能系统的功率支撑能力,平衡了储能输出和平滑能力的矛盾。

关键词：风电并网功率波动储能风-储联合系统模型预测控制储能出力水平

Effect of erbium on microstructures and properties of Mg-Al intermetallic

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Journal of Rare Earths 2014年第11期32卷 1064-1072页

作者：李永刚卫英慧侯利锋郭春丽韩鹏举 College of Materials Science and Engineering Taiyuan University of Technology College of Mechanical Engineering Taiyuan University of Technology Lvliang College

The effect of the rare earth element Er on the microstructures and properties of Mg-Al intermetallic were studied in this experiment. Metallographic and X-ray diffraction（XRD） results showed that the microstructures of Mg-Al-Er alloys varied with Er content. The Mg-44Al-0.5Er and Mg-43.8Al-1.0Er alloys were both composed of Mg17Al12 matrix and Al3 Er phase, whereas Mg-43Al-3.0Er and Mg-42Al-5.0Er were composed of Mg17Al12 matrix, Al3 Er phase, and Mg-Mg17Al12 eutectic. The Mg-42Al-5.0Er alloy showed the highest microhardness, and the values remained nearly stable as Er content increased from 1.0 wt.% to 5.0 wt.%. The dispersed second phase Al3 Er caused the grain refinement of the Mg-Al-Er alloy, which was the main reason for the improvement in microhardness. The corrosion resistance of the Er-containing alloys initially increased and then decreased with increasing Er content. All the Er-containing alloys had the ability to suppress hydrogen evolution, which was the main reason for the higher corrosion resistance of the modified alloys than that of the Mg-44.3Al alloy. Considering the higher hardness and dispersity of the Al3 Er phase, Mg-43.8Al-1.0Er exhibited higher wear resistance than the as-cast Mg-44.3Al alloy.

关键词： Mg-Al intermetallic precipitates electrochemical characterization wear X-ray diffraction rare earths

Mutations in wheat TaAPA2 gene result in pleiotropic effects on plant architecture

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Science China(Life Sciences) 2024年第9期67卷 2039-2042页

作者： Shengsheng Bai Guiping Wang Rui Song Yanna Liu Lei Hua Jinwei Yang Lijun Zhang Shams ur Rehman Xiaohua Hao lifeng hou Chaozhong Zhang Hongna Li Yanyan Liang Lihua Zhao Yan Xue Zheng Wang Shisheng Chen National Key Laboratory of Wheat Improvement Peking University Institute of Advanced Agricultural SciencesShandong Laboratory of Advanced Agriculture Sciences in WeifangWeifang 261325China Department of Plant Sciences University of CaliforniaDavisCA 95616USA

Dear Editor,Bread wheat(Triticum aestivum L.)is a globally important cereal providing~20% of the calories and proteins for>4.5billion *** architecture,including morphologies of leaves,spikes,stems,and roots,has great impact on plant development and productivity,and thus has been extensively investigated in various plant species(Jiang et al.,2023;Zhang et al.,2017).

关键词： cereal globally roots

VCSEL with reticular electrode and larger emitting aperture and its optoelectronic characteristics

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Chinese Optics Letters 2010年第8期8卷 773-775页

作者：冯源侯立峰郝永芹晏长岭赵英杰王玉霞钟景昌 National Key Laboratory on High Power Semiconductor Lasers Changchun University of Science and Technology

The enlargement of the emitting aperture is usually one of the important methods of increasing vertical- cavity surface-emitting laser （VCSEL） optical output power. However, in a VCSEL with a larger aperture, the inhomogeneity in the injected current often causes inhomogeneous or even no emission. To solve this problem and to increase VCSEL output power, as well as to improve its thermal characteristics, we develop a new type of injected VCSEL with a larger aperture and a reticular electrode, where the conventional circular injection electrode of the P side is turned into a reticular one, and the heat sink is on the N side. The tests of the new VCSEL show an improvement in homogeneity in not only the injected current but also the emission intensity. The optical output power is also considerably increased, and the device optoelectronic performance is improved.

关键词： Lasers

AZ91D镁合金表面机械研磨处理后显微结构研究

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稀有金属材料与工程 2008年第3期37卷 530-533页

作者：侯利锋卫英慧刘宝胜许并社太原理工大学山西太原030024

采用表面机械研磨(SMAT)技术在AZ91D镁合金上制备出纳米晶结构表层,利用X射线衍射(XRD)仪、透射电子显微镜(TEM)及高分辨透射电子显微镜(HRTEM)研究由表层沿厚度方向的组织结构变化特征。结果表明:经过表面机械研磨处理,样品表层形成了... 详细信息

采用表面机械研磨(SMAT)技术在AZ91D镁合金上制备出纳米晶结构表层,利用X射线衍射(XRD)仪、透射电子显微镜(TEM)及高分辨透射电子显微镜(HRTEM)研究由表层沿厚度方向的组织结构变化特征。结果表明:经过表面机械研磨处理,样品表层形成了厚度约为40μm的变形层,平均晶粒尺寸由约40nm逐渐增加到约200nm。

关键词： AZ91D镁合金表面机械研磨组织

基于RLS多参数辨识的飞轮储能系统自适应控制方法

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电器与能效管理技术 2019年第20期 40-46页

作者：侯力枫国网冀北电力有限公司承德供电公司

电机作为飞轮储能系统中的核心部件,其控制性能直接影响整个飞轮储能系统的运行。针对永磁无刷直流电机矢量控制系统中电流/速度控制器对参数的依赖性直接影响电机的控制性能,对电流/速度控制器传递函数近似处理原则在特定条件下的具体... 详细信息

电机作为飞轮储能系统中的核心部件,其控制性能直接影响整个飞轮储能系统的运行。针对永磁无刷直流电机矢量控制系统中电流/速度控制器对参数的依赖性直接影响电机的控制性能,对电流/速度控制器传递函数近似处理原则在特定条件下的具体情况进行深入分析。以此为基础提出了一种基于递推最小二乘法的多参数辨识自适应控制方法,对基于dq轴坐标系下的电机电感参数和运动惯量进行在线辨识,提高了参数辨识精度,并利用鞅差序列对目标算法进行收敛性分析。仿真与试验结果验证了所提控制算法的正确性和可行性。

关键词：飞轮储能无刷直流电机矢量控制递推最小二乘法在线参数辨识

提高风储发电经济性的双储能系统模型预测控制方法

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电网与清洁能源 2020年第5期36卷 97-106页

作者：侯力枫国网冀北电力公司承德公司

储能系统可以有效降低风电规模化接入对电力系统造成的影响。在储能电池平滑风电功率波动的典型应用场景下,单储能频繁充放电切换将影响储能电池的使用年限,降低经济性。因此,文中提出了一种双储能电池的模型预测控制方法。首先,建立双... 详细信息

储能系统可以有效降低风电规模化接入对电力系统造成的影响。在储能电池平滑风电功率波动的典型应用场景下,单储能频繁充放电切换将影响储能电池的使用年限,降低经济性。因此,文中提出了一种双储能电池的模型预测控制方法。首先,建立双储能风力发电系统的数学模型,分析储能输出功率对未来出力能力的影响;然后,设计以储能出力最优和基于储能能量状态改变双储能出力约束的模型预测控制策略;最后,利用实际风场数据,与单一储能模型预测控制对比,仿真结果表明在相同储能容量和平滑效果下,所提方法显著地降低了储能充放电切换,延长储能使用周期,并通过分析储能运行成本的经济性,验证了所提方法的优越性。

关键词：风电功率波动双储能模型预测控制充放电循环