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Effect of Ce on solute redistribution in liquid ahead of solid–liquid interface during solidification of Fe–4 wt.%Si alloy

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Journal of Iron and Steel Research International 2021年第10期28卷 1251-1258页

作者： Yun-ping Ji Ming-xing Zhang Yuan Hou Tong-xin Zhao Yi-ming Li Hui-ping ren School of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials Baotou014010Inner MongoliaChina School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD4072Australia Testing Center Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Analytical Applications Center SHIMADZU(China)Co. Ltd.Shanghai200233China

The high efficiency of Ce addition in grain refinement ofδ-ferrite in a cast Fe–4 wt.%Si alloy was *** order to further understand the solute effect of Ce on the grain refinement of δ-ferrite,the conventional directional solidification technique,which enabled to freeze the solid–liquid interface to room temperature,was used to investigate the interfacial morphology and solute redistribution in the liquid at the front of the interface,together with thermodynamic calculation of the equilibrium partition coefficients of Ce and Si in Fe–4 wt.%Si–Ce system using the Equilib module and the FsStel database in FactSage software *** examination using a laser scanning confocal microscope showed a transition of the solid–liquid interface from planar to cellular in the Fe–4 wt.%Si alloy after adding 0.0260 wt.%Ce during the directional solidification ***,electron probe microanalysis revealed an enhanced segregation of Si solute in the liquid at the front of the solid–liquid interface due to the Ce *** solute segregation is considered as the cause of planar to cellular interface transition,which resulted from the creation of constitutional supercooling *** calculation indicated that Ce also segregated at the solid–liquid interface and the Ce addition had negligible effect on the equilibrium partition coefficient of *** is reasonable to consider that the contribution of Ce to the grain refinement ofδ-ferrite in the cast Fe–4 wt.%Si alloy as a solute was marginal.

关键词： Ce Fe-4 wt.%Si alloy Solute redistribution Directional solidification Electron probe microanalysis Thermodynamic calculation

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Exact Solutions and Coherence Structures of Generalized Breor-Kaup Equations

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Communications in Theoretical Physics 2008年第12期50卷 1283-1286页

作者： ZHENG Qiang ZHANG Xiao-ping ren Zhong-Zhou Department of Physics Nanjing University Nanjing 210093 China

Using the mapping method based on q-deformed hyperbolic functions,the exact solutions of generalizedBreor-Kaup equations are *** on the solutions,two coherent structures,periodic-branch kink and non-propagating kink,h... 详细信息

关键词： mapping method periodic-branch kink non-propagating kink soliton interaction background

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Anti-synchronization Between Lorenz and Liu Hyperchaotic Systems

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Communications in Theoretical Physics 2008年第9期50卷 677-680页

作者： ZHENG Qiang ZHANG Xiao-ping ren Zhong-Zhou Department of Physics Nanjing University Nanjing 210093 China

Anti-synchronization between different hyperchaotic systems is presented using Lorenz and Liu systems. When the parameters of two systems are known, one can use active synchronization. When the parameters are unknown or uncertain, the adaptive synchronization is applied. The simulation results verify the effectiveness of the proposed two schemes for anti-synchronization between different hyperchaotic systems.

关键词： hyperchaotic system anti-synchronization active synchronization adaptive synchronization

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基于利益相关者理论的公立医院人才评价路径构建

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中华医院管理杂志 2024年第5期40卷 343-347页

作者：张丹鹿王洪津王宏利沙珂冰任萍大连医科大学附属第二医院人力资源部大连116023 大连医科大学附属第二医院办公室大连116023

人才评价是人才发展体制机制的重要组成部分。本研究基于利益相关者理论,识别和界定公立医院人才评价中的利益相关者,并分析各方需求和相互间的关系,进而构建公立医院人才评价路径。公立医院人才评价中的利益相关者包括政府、社会、用... 详细信息

人才评价是人才发展体制机制的重要组成部分。本研究基于利益相关者理论,识别和界定公立医院人才评价中的利益相关者,并分析各方需求和相互间的关系,进而构建公立医院人才评价路径。公立医院人才评价中的利益相关者包括政府、社会、用人主体和人才自身,政府的人才战略需求和社会的人才公益需求通过政策导向与功能定位向用人主体传递;用人主体通过人才评价指标库的建立与"领域-导向"代表性指标设置,形成基于自身发展需求的评价实施机制;最后,可通过人才个体对于主要评价类别和代表性指标的自主选择,以及用人主体对相关指标权重的个性化设置,以反馈人才对专长价值的评价需求,强化人才评价的有效性。以利益相关者理论分析框架构建基于需求要素的公立医院人才评价体系,可为公立医院人才评价改革提供参考。

关键词：医院,公立人才评价自主选择利益相关者路径

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Solvothermal Synthesis and Electrochemical Properties of Octahedral Cobalt Oxide Decorated with Ag_2O

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Journal of Wuhan University of Technology(Materials Science) 2017年第3期32卷 568-573页

作者：李洋 ren ping WU Wenjian CHEN Changzhao WU Mingzai School of Mechanics and Optoelectronic Physics Anhui University of Science and Technology Co-operative Innovation Research Center for Weak Signal-Detecting Materials and Devices Integration Anhui University

Octahedral CoO with nanostructures decorated with Ag nanoparticles was prepared via a facile solvothermal approach. After being annealed at 500 ℃ for 1 h, an electrochemical capacitor material of Co3O4 decorated with Ag2O was obtained. The cyclic voltammetry and galvanostatic charge-discharge were used to evaluate the electrochemical properties of the as-prepared products. The results indicated that the as-prepared samples exhibited fine pseudo-capacitive performance, and the surface modifications of Ag2O can significantly increase the capacitance of the Co3O4 material. The specific capacitance of Ag2O/Co3O4 composite electrode was up to 217.6 F·g^-1, which was 3.35 times as high as that of pure Co3O4. Moreover, Ag2O/Co3O4 composite showed an excellent cycle performance, and 65.3% of specific capacitance was maintained after 200 cycles.

关键词： cobalt oxide silver oxide octahedral electrochemical

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Dynamic Identification and Evolution of Urban-suburban-rural Transition Zones Based on the Blender of Natural and Humanistic Factors: A Case Study of Chengdu, China

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中国地理科学（英文版） 2024年第5期 791页

作者： DENG Wei JIANG Zhenyuan ZHANG Shaoyao ren ping ZHANG Hao WANG Zhanyun

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A mixture of HMM,GA,and Elman network for load prediction in cloud-oriented data centers

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第11期14卷 845-858页

作者： Da-yu XU Shan-lin YANG ren-ping LIU MOE Key Laboratory of Process Optimization and Intelligent Decision-Making Hefei University of Technology Information and Communication Technologies Centre CSIRO

The rapid growth of computational power demand from scientific,business,and Web applications has led to the emergence of cloud-oriented data *** centers use pay-as-you-go execution environments that scale transparently to the *** prediction is a significant cost-optimal resource allocation and energy saving approach for a cloud computing *** linear or nonlinear prediction models that forecast future load directly from historical information appear less *** classification before prediction is necessary to improve prediction *** this paper,a novel approach is proposed to forecast the future load for cloud-oriented data ***,a hidden Markov model(HMM) based data clustering method is adopted to classify the cloud *** Bayesian information criterion and Akaike information criterion are employed to automatically determine the optimal HMM model size and cluster *** HMMs are then used to identify the most appropriate cluster that possesses the maximum likelihood for current *** the data from this cluster,a genetic algorithm optimized Elman network is used to forecast future *** results show that our algorithm outperforms other approaches reported in previous works.

关键词： Cloud computing Load prediction Hidden Markov model Genetic algorithm Elman network

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调水调沙影响下黄河山东段鱼类群落格局及多样性

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水生生物学报 2024年第6期48卷 889-897,I0001-I0003页

作者：丛旭日李秀启董贯仓孙鲁峰客涵任一平山东省淡水渔业研究院济南250013 农业农村部黄河下游渔业资源环境科学观测实验站济南250117 中国海洋大学水产学院青岛266003

文章于2019—2021年调水调沙前后利用多种网具对黄河山东段4个站位开展鱼类资源调查,研究了黄河山东段鱼类群落的种类组成、生态类型、优势种、生物多样性及环境影响因子等。结果表明,山东段共采集鱼类59种,隶属于10目20科,调水前优势... 详细信息

文章于2019—2021年调水调沙前后利用多种网具对黄河山东段4个站位开展鱼类资源调查,研究了黄河山东段鱼类群落的种类组成、生态类型、优势种、生物多样性及环境影响因子等。结果表明,山东段共采集鱼类59种,隶属于10目20科,调水前优势种为鲫(Carassius auratus)、鳊(Parabramis pekinensis)、鲤(Cyprinus carpio)、赤眼鳟(Squaliobarbus curriculus)、翘嘴鲌(Culter alburnus)、草鱼(Ctenopharyngodon idellus)、鲻(Mugil cephalus)、鮻(Liza haematocheilus),调水后优势种为鲫、鳊、鲤、赤眼鳟。多样性指数方面ShannonWiener指数、丰富度指数差异较显著(0.010.05)。聚类分析表明,调水调沙前后黄河山东段鱼类群落结构在相似水平为45%时可以划分为2组,调水调沙后东阿断面(AH2)与其他断面相比具有较强的差异性;相似水平为60%时可以划分为4组,分别为A组群(AH3、BH3和BH2)、B组群(AH1和BH1)、C组群(AH4和BH4)、D组群(AH2)。SIMPER分析显示,A组群平均相似率为60.66%,特征种包括鳊、翘嘴鲌、赤眼鳟、鮻、似鳊(Pseudobrama simoni)、鲢(Hypophthalmichthys molitrix),B组群平均相似率为66.38%,特征种包括鳊、鲫、鲇(Silurus asotus)、鲤、(Hemiculter leucisculus),C组群平均相似率为68.48%,特征种包括鲤、鲫、翘嘴鲌、鳊、鮻。RDA分析表明径流量、总磷是影响群落结构的主要因子。基于以上结果,研究对比黄河各河段鱼类群落结构特征,分析调水调沙对黄河山东段鱼类群落格局及多样性的影响,发现庞口湾作为鱼类栖息地的重要性并提出保护建议。研究可为黄河山东段渔业资源保护和可持续发展提供理论依据和技术支撑。

关键词：黄河山东段调水调沙鱼类群落多样性环境因子

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Design of a low-alloy high-strength and high-toughness martensitic steel

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 733-740页

作者： Yan-jun Zhao Xue-ping ren Wen-chao Yang Yue Zang School of Materials Science and Engineering Guangxi University School of Materials Science and Engineering University of Science and Technology Beijing

To develop a high strength low alloy （HSLA） steel with high strength and high toughness, a series of martensitic steels were studied through alloying with various elements and thermodynamic simulation. The microstructure and mechanical properties of the designed steel were investigated by optical microscopy, scanning electron microscopy, tensile testing and Charpy impact test. The results show that cementite exists between 500℃ and 700℃, M7C3 exits below 720℃, and they are much lower than the austenitizing temperature of the designed steel. Furthermore, the Ti（C,N） precipitate exists until 1280℃, which refines the microstructure and increases the strength and toughness. The optimal alloying components are 0.19% C, 1.19% Si, 2.83% Mn, 1.24% Ni, and 0.049% Ti; the tensile strength and the V notch impact toughness of the designed steel are more than 1500 MPa and 100 J, respectively.

关键词： high strength steel martensitic steel alloy design thermodynamics alloying elements microstructuremechanical properties

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Optimal Estimation for Fault Section in Power System Based on Harmony Search Algorithm

Optimal Estimation for Fault Section in Power System Based o...

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第25届中国控制与决策会议

作者： ping ren Liqun Gao Nan Li School of Information Engineering Shenyang University School of Information Science and Engineering Northeastern University Shenyang University

ISBN: (纸本)9781467355339

In this paper, the nonlinear optimal control problem is formulated as a multi-objective mathematical optimization problem. Harmony search （HS） algorithm is one of the new heuristic algorithms. The HS optimization algorithm is introduced for the first time in solving the fault section estimation performance in power systems. A case on optimal estimation for fault section in the part of the 230KV Southern Brazilian electric power system is presented to show the methodology’s feasibility and efficiency, compared with the existing fault section estimation in power system methods, the search time of the HS optimization algorithm is shorter and the result is close to the ideal solution, simultaneously.

关键词： Optimal estimation Fault section Power system Harmony search algorithm

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