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Mineralogical properties and co-sintering characteristics of fluxed iron ore with magnetite concentrates

Journal of Iron and Steel Research International 2024年第2期31卷 318-328页

作者： Le-le Niu Zheng-jian Liu jian-liang Zhang Yao-zu Wang Zhen-xing Yang Si-da Li Chang-dong Shan Ben Feng School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China Xinxing Casting Pipe Xinjiang Co. Bayingol841300XinjiangChina

To investigate the feasibility of co-sintering of fluxed iron ore with magnetite concentrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microscopic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic sintering characteristics were designed under seven different fluxed iron ore ratios, and the integrated ranking of different fluxed iron ore ratios was determined using gray relation analysis. Finally, the results of the industrial trails were combined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can account for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (CaCO3) and dolomite (CaMg(CO3)2). The average particle size of granules and powder removal rate can be improved from 2.50 to 3.16 mm and 39.60% to 24.20%, respectively, with the increase in the fluxed iron ore ratio. Furthermore, the fluxed iron ore can improve assimilability and liquid fluidity of magnetite concentrates. In terms of overall granulation performance and sintering characteristics, the fluxed iron ore ratios are graded from best to worst as follows: 12%, 15%, 9%, 18%, 21%, 6% and 3%. The industrial trails show that when the fluxed iron ore ratio is increased, the beneficial effect of the superior sintering characteristics of the fluxed iron ore itself is ideally balanced with the negative effect of the lower amount of additional CaO at 12% ratio, and thus, it is feasible to bring the fluxed iron ore into production at a level of roughly 12%.

关键词： Fluxed iron ore Magnetite concentrate Granulation performance Sintering characteristics Gray relation analysis

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中美女子体操全能运动员单项能力比较

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体育文化导刊 2010年第12期 34-37页

作者：梁健辉广东药学院体育部广州510006

运用文献资料、逻辑分析、录像观察和数理统计等方法对近3次世界体操大赛中、美女子全能运动员成绩以及各单项前3名的成绩进行比较分析,找出我国女子全能运动员的不足。主要结论:稳定的发挥是保证,较强的单项能力是关键;我国运动员的单... 详细信息

运用文献资料、逻辑分析、录像观察和数理统计等方法对近3次世界体操大赛中、美女子全能运动员成绩以及各单项前3名的成绩进行比较分析,找出我国女子全能运动员的不足。主要结论:稳定的发挥是保证,较强的单项能力是关键;我国运动员的单项能力不强,缺少竞争力;我国该项目的后备人才储备不足,缺少年轻的优秀全能运动员。

关键词：竞技体育中美女子体操全能单项能力

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广东省普通高校排球队发展制约因素及对策研究

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广州体育学院学报 2012年第3期32卷 65-68页

作者：梁健辉广东药学院体育部广东广州510006

通过搜集文献资料、发放问卷、专家访谈等方法,从高校排球竞赛、教学与训练、教练员与运动员,以及场地设施等方面对广东普通高校排球队的现状进行调查研究,分析制约其发展的主要因素,并针对存在的问题提出完善竞赛制度、加强教练员队伍... 详细信息

通过搜集文献资料、发放问卷、专家访谈等方法,从高校排球竞赛、教学与训练、教练员与运动员,以及场地设施等方面对广东普通高校排球队的现状进行调查研究,分析制约其发展的主要因素,并针对存在的问题提出完善竞赛制度、加强教练员队伍建设、扩大学生排球队伍、加强训练管理,以及加大场地设施建设投入等相应对策,为广东普通高校排球运动的发展提供科学依据和理论参考。

关键词：高校排球队调查研究

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FC200现场总线模块在转炉炼钢厂的应用

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冶金自动化 2011年第2期35卷 66-68页

作者：梁建辉宜科(天津)电子有限公司工程部

介绍现场总线模块原理及FC200现场总线模块产品的特点,结合转炉工艺特点配置系统硬件及设置参数;根据转炉工艺要求介绍编程要点。FC200现场总线模块是成熟的产品,经现场应用结果表明它能出色应用在冶金等行业,相比传统集中式系统节约大... 详细信息

介绍现场总线模块原理及FC200现场总线模块产品的特点,结合转炉工艺特点配置系统硬件及设置参数;根据转炉工艺要求介绍编程要点。FC200现场总线模块是成熟的产品,经现场应用结果表明它能出色应用在冶金等行业,相比传统集中式系统节约大量有色金属,减少自动化系统的整体投资,提高可靠性,方便维护。

关键词：现场总线技术 FC200模块 PLC编程

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Change in self-image pressure level before and after autologous fat breast augmentation and its effect on social adaptability

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World Journal of Psychiatry 2024年第6期14卷 920-929页

作者： jian Li hui-Min Wang Yang jiang Zhen-Nan Liu Bai-hui He Department of Plastic Surgery The First Affiliated Hospital of Xinxiang Medical UniversityXinxiang 453100Henan ProvinceChina Department of Otolaryngology The First Affiliated Hospital of Xinxiang Medical UniversityXinxiang 453100Henan ProvinceChina

BACKGROUND There is an increasingly strong demand for appearance and physical beauty in social life,marriage,and other aspects with the development of society and the improvement of material living *** increasing number of people have improved their appearance and physical shape through aesthetic plastic *** female breast plays a significant role in physical beauty,and droopy or atrophied breasts can frequently lead to psychological inferiority and lack of confidence in ***,in turn,can affect their mental health and quality of *** To analyze preoperative and postoperative self-image pressure-level changes of autologous fat breast augmentation patients and their impact on social *** We selected 160 patients who underwent autologous fat breast augmentation at the First Affiliated Hospital of Xinxiang Medical University from January 2020 to December 2022 using random sampling *** general information,selfimage pressure level,and social adaptability of the patients were investigated using a basic information survey,body image self-assessment scale,and social adaptability *** self-image pressure-level changes and their effects on the social adaptability of patients before and after autologous fat breast augmentation were *** We collected 142 valid *** single-factor analysis results showed no statistically significant difference in the self-image pressure level and social adaptability score of patients with different ages,marital status,and monthly ***,there were significant differences in social adaptability among patients with different education levels and employment *** correlation analysis results revealed a significant correlation between the self-image pressure level and social adaptability score before and after *** factors analysis results showed that the degree of concern caused by appearance in selfimage pressure,the degree of possible behavior

关键词： Autologous fat breast augmentation surgery Self-image stress level Social adaptability Analysis of correlation Structural equation model

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Unlocking the Potential of Poly(butylene succinate) through Incorporation of Vitrimeric Network Based on Dynamic Imine Bonds

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Chinese Journal of Polymer Science 2024年第10期42卷 1414-1424页

作者： Shan-Song Wu hui-Juan Lu Yi-Dong Li Shui-Dong Zhang jian-Bing Zeng Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical Engineering Southwest University School of Mechanical and Automotive Engineering South China University of Technology

Poly(butylene succinate)(PBS) exhibits many advantages, such as renewability, biodegradability, and impressive thermal and mechanical properties, but is limited by the low melt viscosity and strength resulted from the linear structure. To address this, vitrimeric network was introduced to synthesize PBS vitrimers(PBSVs) based on dynamic imine bonds through melt polymerization of hydroxyl-terminated PBS with vanillin derived imine containing compound and hexamethylene diisocyanate using trimethylolpropane as a crosslinking monomer. PBSVs with different crosslinking degrees were synthesized through changing the content of the crosslinking monomer. The effect of crosslinking degree on the thermal, theological, mechanical properties, and stress relaxation behavior of the PBSVs was studied in detail. The results demonstrated that the melt viscosity, melt strength, and heat resistance were enhanced substantially without obvious depression in crystallizability, thermal stability, and mechanical properties through increasing crosslinking degree. In addition, the PBSVs exhibit thermal reprocessability with mechanical properties recovered by more than 90% even after processing for three times. Furthermore, PBSV with improved melt properties shows significantly improved foamability compared to commercial PBS. This research contributes to the advancement of polymer technology by successfully developing PBS vitrimers with improved properties, showcasing their potential applications in sustainable and biodegradable materials.

关键词： Foamability Imine bonds Poly(butylene succinate) Vitrimer

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A Simple-Prepared and Multi-Reusable Adhesive Based on Epoxy Vitrimer

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Chinese Journal of Polymer Science 2024年第10期42卷 1589-1594页

作者： Yu-Ting Wang Huan liang Yen Wei jian-Long Wang Xiang-Ming He Yang Yang Institute of Nuclear and New Energy Technology Tsinghua University The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education) Department of Chemistry Tsinghua University

Adhesives play an important role in modern society's production and daily life. Developing robust and sustainable adhesives remains a great challenge. Here we report a sustainable epoxy-vitrimer adhesive with high adhesive strength (about 10 MPa) and reusability (82%strength after 3 times). This adhesive can be fabricated from commercially available products through a straightforward hot-pressing method without the need of solvents. The adhesive process is also simple, requiring only 30 min at 180°C. In addition, the vitrimer adhesive has the advantages of both erasability for reuse and excellent water resistance. This work provides a facile strategy to fabricate high-strength adhesive that ensures reusability, recyclability, low cost of raw materials, and simple processing technology. Simultaneously, it expands the range of potential applications for epoxy vitrimers.

关键词： Adhesive Epoxy Reusable Sustainable Vitrimer

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Understanding the Thermal Impedance of Silicone Rubber/Hexagonal Boron Nitride Composites as Thermal Interface Materials

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Chinese Journal of Polymer Science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu Shao-Yun Guo Feng-Shun Zhang jian-hui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

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Effects of functional and transcriptional Hsp70 inhibitors on development and expres⁃sion of conditioned place preference induced by morphine in rats

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中国药理学与毒理学杂志 2021年第9期35卷 661-661页

作者： GONG Qi WEI Shou-peng LI Yu-ling liang hui liang jian-hui Department of Pharmacology School of Basic Medical ScienceSchool of Pharmaceutical SciencesPeking UniversityBeijing 100083China Department of Pharmacy Shanghai East Hospi-talSchool of MedicineTongji UniversityShanghai 200120China Department of Molecular and Cellular Pharmacology School of Pharmaceutical SciencesPeking UniversityBeijing 100083China

OBJECTIVE To investigate the effects of heat shock protein 70(Hsp70)in the development as well as expression of morphine induced conditioned place preference(CPP)in rats using Hsp70 *** The unbi⁃ased procedures of CPP lasted for 7 d and included three phases:preconditioning(D1-D3),conditioning(D4-D6,6 sessions)and test(D7).Here,morphine 5 mg·kg-1 injected in a subcuta⁃neous(sc)manner can induce significant place *** of Hsp70 were injected into the right lateral ventricle during either the condi⁃tioning phase or the test phase ***⁃thermore,the expression of Hsp70 in certain areas of the mesocorticolimbic system was also studied following the intervention of N-formyl-3,4-methylenedioxybenzylidine-γ-butyrolactam(KNK437),a transcriptional inhibitor of *** Pifithrin-μ(PES),a selective functional inhibitor acting on the substrate binding domain(SBD)of Hsp70,dose-dependently suppressed both the acquisition and expression of morphine-induced *** function was observed after the intracerebroventricular injection(icv)of *** other functional inhibitor methy⁃lene blue,targeting the nucleotide-binding area,showed a significant tendency of inhibitory phar⁃macological effect on the expressional and devel⁃opment phases of morphine-induced *** the interventions of KNK437,we found that the level of Hsp70 was significantly decreased in the NAcs both in the acquisition and expres⁃sion of morphine induced *** Hsp70 in NAcs plays a critical role in mediating the psychological dependence induced by morphine.

关键词： morphine reward conditioned place preference heat shock protein 70 methylene blue

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Cutting performance of saw blades with microtextured rougher and finisher sawteeth

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Advances in Manufacturing 2024年第2期12卷 317-334页

作者： Yang Lu jian-Xin Deng Zhi-hui Zhang Jia-Xing Wu Ran Wang Yi-Chen Bao Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan250061People’s Republic of China

The problems of severe sawtooth wear,harsh sawing noise,and low surface quality during the processing of circular saw blades need to be *** improve the cutting performance of TiC-based cermet saw blades,microtextures parallel to the cutting edge were fabricated on rough and fine sawteeth by laser *** cutting tests were performed on a sawing platform under lubricated *** of the sawing arc length and working sawtooth cutting force variations were developed for sawing steel pipes,and the accuracy of the sawing force model was verified *** results indicate that the variations in the sawing force are proportional to the sawing arc *** circular saw blades with microtextures that did not penetrate the sawtooth rake face exhibited the lowest cutting force,sawing noise,and highest machined surface ***,the worn-out distance of the rougher and finisher sawteeth was reduced by approximately 7.4%and 44.1%,respectively,compared with conventional circular saw *** main failure modes of sawteeth were tip wear,rake face adhesion,and oxidative *** addition,the mechanism by which the textures improve the cutting and wear properties of TiC-based circular saw blades was *** study provided a significant concept for enhancing the cutting performance of circular saw blades and improving the machined surface quality.

关键词： Circular saw blades Micro textures Cutting performance Wear performance

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