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Distribution of nonmetallic inclusions in molten steel under hot-top pulsed magneto-oscillation treatment

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Journal of Iron and Steel Research International 2018年第8期25卷 867-876页

作者： Hui-cheng Li Zhen Liu Ren-xing Li yong-yong gong Zhi-shuai Xu Qi-jie Zhai State Key Laboratory of Advanced Special Steels Shanghai University Shanghai 200444 China School of Materials Science and Engineering Shanghai University Shanghai 200444 China College of Science Shanghai University Shanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444 China

To control the distribution of nonmetallic inclusions in molten developed method, hot-top pulsed magneto-oscillation （HPMO）, steel is of highly commercial importance. A newly was employed to control nonmetallic inclusions in a medium-carbon steel ingot. The experimental results present that the position of nonmetallic inclusions of spinel （Al-Mg-O） and Mn-S inclusions is significantly influenced by HPMO. The number of nonmetallic inclusions gradually increased from the lateral wall to the center of ingot along the radial direction under the impact of HPMO treatment, whereas this distribution trend cannot be observed in the reference sample without HPMO treatment. In addition, the number of inclusions along vertical direction is proportional to the height of ingot, especially for the inclusions with the size of larger than 10 pro. It indicates that the application of HPMO can push away inclusions from lateral to center, and then the expelled inclusions aggregate and rise up to the top of ingot.

关键词： Hot-top pulsed magneto-oscillation Nonmetallic inclusion Distribution Ingot quality

Influence of electromagnetic parameters on solidification structure of pure AI in the case of identical power

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Journal of Iron and Steel Research International 2018年第8期25卷 854-861页

作者： yong-yong gong Shu-min Cheng Yu-yi Zhong Xiang Wang Yun-hu Zhang Qi-jie Zhai Hong-gang Zhong Zhi-shuai Xu Rong Yue Ning Pei College of Science Shanghai University Shanghai 200444China Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200444China School of Materials Science and Engineering Shanghai University Shanghai 200444 China Materials Genome Institute Shanghai UniversityShanghai 200444 China

Pulsed magneto-oscillation （PMO） as a new electromagnetic technology to generate the grain refinement in metals and alloys was significantly developed in recent years. The influence of electromagnetic parameters on the grain size reduction in pure AI was investigated under the application of PMO with a constant inputting power. The experimental results show that the grain refinement degree could be improved with the increase in the current intensity in the case of the identical power. Moreover, through analysing the electromagnetic force and resistance force applied on the nucleus, a criterion of the nucleus detached from the mould wall was constructed. Based on the criterion, the detachment of nuclei with finer radius could cause better effect of the grain refinement, when applying a higher current peak. The movement of the detached grains was considered by analysing the influence of electromagnetic force and forced flow.

关键词： Grain refinement Pure Al Solidification Pulsed magneto-oscillation Identical power

沉船同步提升升沉补偿试验平台设计及联合仿真

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液压与气动 2017年第4期41卷 21-27页

作者：张增猛李烁侯交义宁大勇弓永军大连海事大学交通运输装备与海洋工程学院辽宁大连116026

以"畅通轮"尾端打捞为例,提出了沉船同步提升液压升沉补偿试验平台的结构,搭建了模拟沉船同步提升升沉补偿试验平台;针对其中的二自由度升沉补偿平台,对其进行了运动学反解,搭建了基于运动学控制的Simulink模型;结合阀控缸伺服控制系统... 详细信息

以"畅通轮"尾端打捞为例,提出了沉船同步提升液压升沉补偿试验平台的结构,搭建了模拟沉船同步提升升沉补偿试验平台;针对其中的二自由度升沉补偿平台,对其进行了运动学反解,搭建了基于运动学控制的Simulink模型;结合阀控缸伺服控制系统实现了二自由度平台对波浪运动的模拟,并搭建了整个运动控制及升沉补偿控制系统的模型;通过ADAMS与MATLAB的联合仿真,验证了该二自由度平台升沉补偿控制系统的运动控制能力和动态响应能力,并对比补偿前后的升沉平台位移,证明了该系统良好的补偿特性。

关键词：升沉补偿二自由度平台波浪模拟联合仿真

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涂装车间能源管理系统的开发与应用

海洋工程装备与技术 2016年第4期3卷 261-268页

作者：李清庄国全杨永刚龚永春袁海田上海外高桥造船海洋工程有限公司上海201306

结合对涂装车间精细化设备能源管理模型与信息化管理需求的跟踪研究,通过建立统计模型、集成关联信息和数据分析,在原涂装管理系统平台基础上设计开发能源管理系统并加以实践运用,为实现能源管理精细化、降低生产成本,提高管理效益提供... 详细信息

结合对涂装车间精细化设备能源管理模型与信息化管理需求的跟踪研究,通过建立统计模型、集成关联信息和数据分析,在原涂装管理系统平台基础上设计开发能源管理系统并加以实践运用,为实现能源管理精细化、降低生产成本,提高管理效益提供参考与帮助。结果表明:能源管理系统的开发与实践应用,不仅提升了能源的管理及其利用效率,降低了单位生产成本,而且还提供了一种实际可行的系统化、数字化、信息化能源管理模式。

关键词：管理信息系统涂装车间能源

Equivalent Properties for CD Inequalities on Graphs with Unbounded Laplacians

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Chinese Annals of Mathematics,Series B 2017年第5期38卷 1059-1070页

作者： Chao gong yong LIN School of Information Renmin University of ChinaBeijing 100872China

The CD inequalities are introduced to imply the gradient estimate of Laplace operator on graphs. This article is based on the unbounded Laplacians, and finally concludes some equivalent properties of the CD(K,∞) and ... 详细信息

关键词： Graph theory CD inequality Unbounded Laplacian

THEORETICAL AND EXPERIMENTAL INVESTIGATIONS OF ENTRAINED AND TRANSPORTED CHARACTERISTICS OF SUBMERGED JET

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Journal of Hydrodynamics 2004年第2期16卷 176-181页

作者： DONGZhi-yong WUChi-gong YANGyong-quan SchoolofCivilandArchitecturalEngineering ZhejiangUniversityofTechnologyHangzhou310014Chinae-mail：dongzy@mail*** StateKeyHydraulicsLaboratoryofHighSpeedFlows SichuanUniversityChengdu610065China

This paper presents entrainment mechanism, and transported and diffusioncharacteristics at the point of entry of submerged jet. The profiles of both velocity andconcentration within the air-water mixing layer were theoretically deduced. And the comparisonsbetween theoretical values and measured data were made. Results show that the velocity profilewithin the air-water mixing layer exhibits a form of error function. The concentrations of airentrainment in the internal and external regions of air-water mixing layer correspond to Gaussiandistribution.

关键词： submerged jet air entrainment diffusion air-water mixing layer point ofjet entry

Photoluminescence properties and energy transfer of novel orange–red emitting phosphors:Ba_(3)Bi_(2)(PO_(4))_(4):Sm^(3+),Eu^(3+) for white light-emitting diodes

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Rare Metals 2021年第10期40卷 2882-2891页

作者： Rui-Rui Cui Xiang Guo Xin-yong gong Chao-yong Deng Key Laboratory of Functional Composite Materials of Guizhou Province Department of Electronic ScienceCollege of Big Data and Information EngineeringGuizhou UniversityGuiyang 550025China

Sm^(3+), Eu^(3+)co-coped Ba_(3)Bi_(2)(PO_(4))_(4) phosphors,as potential phosphors for white light-emitting diode applications, were synthesized through the solid-state reaction method for the first time. The crystal structure,absorption spectra, photoluminescence properties, decay time, energy transfer mechanism, temperature-dependent properties, and Commission International De L’Eclairage(CIE) chromaticity coordinates were investigated systematically. The pure eulytite-type Ba_(3)Bi_(2)(PO_(4))_(4) phase was obtained after heating at 980 ℃ for 5 h. A notably enhanced absorption efficiency at 393 nm was observed when Sm^(3+), as a sensitizer, was doped into Ba_(3)Bi_(1.82)(PO_(4))_(4): 0.18 Eu^(3+)and the band gap of the Ba_(3)Bi_(2)(PO_(4))_(4) host was estimated to be 4.19 eV. The emission intensity of Ba_(3)Bi_(1.82)(PO_(4))_(4): 0.18 Eu^(3+)was significantly enhanced when Sm^(3+)was co-doped. The existence and mechanism of energy transfer from Sm^(3+) to Eu^(3+)were evaluated by photoluminescence spectra and decay time measurements. The CIE chromaticity coordinate of Ba3 Bi1.75(PO4)4: 0.07 Sm^(3+), 0.18 Eu^(3+) phosphor was calculated to be(0.5746, 0.4197), respectively.

关键词： Ba_(3)Bi_(2)(PO_(4))_(4):Sm^(3+) Eu^(3+) Phosphors Photoluminescence Energy transfer

Boosting the Performance Gain of Ru/C for Hydrogen Evolution Reaction Via Surface Engineering

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Energy & Environmental Materials 2023年第5期6卷 415-424页

作者： Xiaobing Bao Yuzhuo Chen Shanjun Mao yong Wang yong Yang Yutong gong State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Advanced Materials and Catalysis Group Institute of CatalysisDepartment of ChemistryZhejiang UniversityHangzhou 310028China

The surface properties of catalysts determine the intrinsic activity and *** is regarded as a potential candidate to substitute platinum for water electrolysis due to the low cost and analogous electronic structures while it suffers from severe dissolution and stability ***,the modification of Ru/C with atomically dispersed cobalt atoms is achieved via a simple thermal doping *** newly formed amorphous shell with Ru-Co sites on the Ru/C catalyst improved the hydrogen evolution reaction activity and stability ***,the obtained Co1Ru@Ru/CN_(x)catalyst exhibited an overpotential as low as 30 mV at 10 mA cm^(-2)in an alkaline medium,which is among the best HER catalysts reported so *** oxygen oxophile Co prevents the fast oxidation and dissolution of Ru species,ensuring outstanding long-term durability up to 70 *** calculations reveal that the Ru-Co coordination acts as a more active site for water dissociation than the ***,the"Ru-Co shell/Ru core"structures show high adaptability for the reaction *** simple doping strategy offers prospects for scalable preparation of highly active electrocatalysts.

关键词： high performance hydrogen evolution reaction ruthenium catalyst surface engineering

Interface microstructure evolution and bonding strength of TC11/c-TiA l bi-materials fabricated by laser powder deposition

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Rare Metals 2016年第6期35卷 456-462页

作者： Zhi-Jun Xu yong-Zhong Zhang Ming-Kun Liu Xin-yong gong Center for Composites General Research Institute for Nonferrous Metals Beijing 100088 China

Laser powder deposition was applied to fabricate the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si （wt%）/Ti-47Al- 2Cr-2Nb-0.2W-0.15B （at%） bi-material system. The asdeposited TC11 alloy shows a basket-wave-like morphology while the as-deposited y-TiAl alloy consists of fully α2/γ lamellar microstructures. Regarding the thermal mismatch between TC11 and γ-TiAl during processing, the interface microstmcture evolution was concerned. The transformation pathway was illustrated. It is found that the content changes of Al elements and β-stabilizers Mo, Cr, and Nb are responsible for the evolution of microstructures at the interface. The fracture surfaces are located at the y-TiAl side. The bi-material shows a brittle-fracture manner, with the ultimate tensile strength of 560 MPa.

关键词： Laser powder deposition TC11 titanium alloy γ-TiAl alloy Bi-material Interface