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A novel high-Cr CoNi-based superalloy with superior high-temperature microstructural stability, oxidation resistance and mechanical properties

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International Journal of minerals,Metallurgy and Materials 2024年第6期31卷 1373-1381页

作者： Xiaorui Zhang min zou Song Lu Longfei Li Xiaoli Zhuang Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced MetalsUniversity of Science and Technology BeijingBeijing 100083China

A novel multicomponent high-Cr CoNi-based superalloy with superior comprehensive performance was prepared,and the evaluation of its high-temperature microstructural stability,oxidation resistance,and mechanical properties was conducted mainly using its cast polycrystalline alloy.The results disclosed that the morphology of theγ′phase remained stable,and the coarsening rate was slow during the long-term aging at 900–1000℃.The activation energy forγ′precipitate coarsening of alloy 9CoNi-Cr was(402±51)kJ/mol,which is higher compared with those of CMSX-4 and some other Ni-based and Co-based superalloys.Importantly,there was no indica-tion of the formation of topologically close-packed phases during this process.All these factors demonstrated the superior microstructural stability of the alloy.The mass gain of alloy 9CoNi-Cr was 0.6 mg/cm^(2) after oxidation at 1000℃ for 100 h,and the oxidation resistance was comparable to advanced Ni-based superalloys CMSX-4,which can be attributed to the formation of a continuous Al_(2)O_(3) protective layer.Moreover,the compressive yield strength of this cast polycrystalline alloy at high temperatures is clearly higher than that of the conventional Ni-based cast superalloy and the compressive minimum creep rate at 950℃ is comparable to that of the conventional Ni-based cast superalloy,demonstrating the alloy’s good mechanical properties at high temperature.This is partially because high Cr is bene-ficial in improving theγandγ′phase strengths of alloy 9CoNi-Cr.

关键词： CoNi-based superalloys microstructure coarsening oxidation mechanical properties

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Effects of vitamin family members on insulin resistance and diabetes complications

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World Journal of Diabetes 2024年第3期15卷 568-571页

作者： Hong-Jin Chen min Wang Ding-min zou Gui-You Liang Si-Yuan Yang Division of Cardiac Surgery Guizhou Institute of Precision MedicineThe Affiliated Hospital of Guizhou Medical UniversityGuiyang 550009Guizhou ProvinceChina Translational Medicine Research Center Guizhou Medical UniversityGuiyang 550025Guizhou ProvinceChina School of Basic Medical Sciences/School of Biology and Engineering Guizhou Medical UniversityGuiyang 550025Guizhou ProvinceChina

The following letter to the editor highlights the article“Effects of vitamin D supplementation on glucose and lipid metabolism in patients with type 2 diabetes mellitus and risk factors for insulin resistance”in World J Diabetes 2023 Oct 15;14(10):1514-1523.It is necessary to explore the role of vitamin family members in insulin resistance and diabetes complications.

关键词： Vitamin Insulin resistance Diabetes complications Letter

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Surface decoration of mesocarbon microbeads with multifunctional TiNbO4-x@C coating layer as high rate and stable anode of Li-ion batteries

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Rare Metals 2024年第5期43卷 2053-2066页

作者： Jia-Mei Lai Zhi-min zou Yu Bai Yu-Tao Xing Chun-Hai Jiang Fujian Provincial Key Laboratory of Functional Materials and Applications Institute of Advanced Energy Materials School of Materials Science and Engineering Xiamen University of Technology Shanghai XFH Science and Technology Development Co. Ltd. Fujian XFH New Energy Materials Co. Ltd. Shenzhen XFH Science and Technology Co. Ltd. Laboratório de Microscopia Eletr?nica de Alta Resolu??o Centro de Caracteriza??o Avan?ada Para a Indústria de Petróleo (LaMAR/CAIPE) Universidade Federal Fluminense

Surface modification of graphite anode with electroactive matters has been proven of a more practical strategy in enhancing the performance of Li-ion batteries than exploring alternative novel anode materials.Herein,rutile Ti NbO4-xnanoparticles with a tunnel structure are employed as multifunctional decoration substances in combination with a carbon coating layer to improve the rate and cycle properties of mesocarbon microbeads（MCMBs）.As compared to pristine MCMB,the Li+diffusion coefficients of the composite anodes are enhanced due to the synergistic effect of Ti Nb O4-x@C.Meanwhile,the overcharge and voltage polarization of the composite anodes at high rate are obviously minimized due to the current sharing effect of the high-potential TiN-bO4-x.Moreover,the amorphous LiyTi Nb O4-xconverted from Ti NbO4-xin the initial lithiation process can deliver pseudocapacitive capacity to the composite anodes from the second cycle.All of these functions of Ti NbO4-x@C coating layer have directly contributed to the improved rate and cycle performance of the MCMB/TiNbO4-x@C composite anodes.The one containing 12.0 wt%Ti NbO4-xexhibits a high reversible specific capacity of 118 m Ah·g-1at 10C (1C=372 m A·g-1),together with a high capacity retention of 90.9%after 300 cycles at 3C,which are all much superior to those of pristine MCMB.

关键词： Li-ion batteries MCMB TiNbO 4− x Surface decoration Rate capability

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Tribological behavior of polydopamine/polytetrafluoroethylene coating on laser textured stainless steel with Hilbert curves

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Friction 2023年第7期11卷 1307-1319页

作者： Firuze SOLTANI-KORDSHULI Nathaniel HARRIS min zou Department of Mechanical Engineering University of ArkansasFayetteville AR 72701USA Center for Advanced Surface Engineering University of ArkansasFayetteville AR 72701USA

Shallow Hilbert curve patterns with easily programmable texture density were selected for laser texturing of stainless steel substrates.Two different texture path segment lengths(12 and 24 μm)and four different laser power percentages(5%,10%,15%,and 20%)were investigated.The textured and smooth substrates were coated with thin polydopamine/polytetrafluoroethylene(PDA/PTFE)coatings for tribological property assessment.The effects of texture density(texture area coverage)and laser power on the durability and friction of the coated surfaces were studied.Laser texturing the substrates improved the coating durability up to 25 times,reduced the friction coefficient,and prevented coating global delamination.The textures fabricated with a laser power of 15%and a texture path segment length of 12 μm yielded the best coating durability.The textures provided the interlocking for the PTFE coating and thus prevented its global delamination.Furthermore,the PTFE inside the texture grooves replenished the solid lubricant worn away in the wear track and prolonged the coating wear life.

关键词： polytetrafluoroethylene(PTFE) coating durability laser texturing Hilbert curve stainless steel

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Epidemiological Surveillance: Genetic Diversity of Rotavirus Group A in the Pearl River Delta, Guangdong, China in 2019

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Biomedical and Environmental Sciences 2024年第3期37卷 278-293页

作者： JIANG Jie Ying LIANG Dan WANG Li XIAO Yun LIANG Yu Feng KE Bi Xia SU Juan XIAO Hong WANG Tao zou min LI Hong Jian KE Chang Wen School of Public Health Shantou UniversityShantou 515063GuangdongChina Guangdong Provincial Center for Disease Control and Prevention Guangdong Workstation for Emerging Infectious Disease Control and PreventionGuangzhou 511430GuangdongChina Guangdong Provincial Key Laboratory of Virology Institute of Medical MicrobiologyJinan UniversityGuangzhou 510632GuangdongChina School of Public Health Sun Yat-sen UniversityGuangzhou 510275GuangdongChina School of Public Health Southern Medical UniversityGuangzhou 510515GuangdongChina Shantou University Medical College Shantou 515041GuangdongChina

Objective This study aimed to understand the epidemic status and phylogenetic relationships of rotavirus group A(RVA)in the Pearl River Delta region of Guangdong Province,China.Methods This study included individuals aged 28 days–85 years.A total of 706 stool samples from patients with acute gastroenteritis collected between January 2019 and January 2020 were analyzed for 17 causative pathogens,including RVA,using a Gastrointestinal Pathogen Panel,followed by genotyping,virus isolation,and complete sequencing to assess the genetic diversity of RVA.Results The overall RVA infection rate was 14.59%(103/706),with an irregular epidemiological pattern.The proportion of co-infection with RVA and other pathogens was 39.81%(41/103).Acute gastroenteritis is highly prevalent in young children aged 0–1 year,and RVA is the key pathogen circulating in patients 6–10 months of age with diarrhea.G9P[8](58.25%,60/103)was found to be the predominant genotype in the RVA strains,and the 41 RVA-positive strains that were successfully sequenced belonged to three different RVA genotypes in the phylogenetic analysis.Recombination analysis showed that gene reassortment events,selection pressure,codon usage bias,gene polymorphism,and post-translational modifications(PTMs)occurred in the G9P[8]and G3P[8]strains.Conclusion This study provides molecular evidence of RVA prevalence in the Pearl River Delta region of China,further enriching the existing information on its genetics and evolutionary characteristics and suggesting the emergence of genetic diversity.Strengthening the surveillance of genotypic changes and gene reassortment in RVA strains is essential for further research and a better understanding of strain variations for further vaccine development.

关键词： Infectious diarrheal disease Rotavirus Phylogenetic analysis Gene rearrangement Codon usage bias Genetic diversity

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In situ preparation of Ag@AgCl/Bio-veins composites and their photocatalytic activity and recyclability

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 906-917页

作者： min zou Chao Tan Zhengqiu Yuan ming Wu Jian Jian Lei Zhang Yan Zhang Zhou Ma Hu Zhou School of Resource&Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Key Laboratory of Theoretical Organic Chemistry and Functional Molecules Ministry of EducationFunctional Film Materials Engineering Research Center of Hunan ProvinceHunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and ConversionSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China School of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China

The industrial application of nano-photocatalysts in wastewater treatment has been severely restricted for a long time due to their difficult separation,poor reusability,and low efficiency.In this work,a facile strategy was proposed to enhance the photocatalytic activity and recovery performance of Ag@AgCl nanocatalysts.Biological veins(Bio-veins)with a unique 3D porous construction were used as carriers for the in-situ growth of Ag@AgCl nanoparticles.Scanning electron microscopy results showed that the Ag@AgCl nanoparticles were uniformly loaded on the surface and interior of the Bio-veins,and the size of the Ag@AgCl nanoparticles immobilized on the Bio-veins(50–300 nm)was significantly smaller than Ag@AgCl obtained by the co-precipitation method(1–3μm).The Bio-veins played a vital role in the photocatalysis reaction system.The degradation efficiency of the Ag@AgCl/Bio-veins(CI4)was up to 3.50 times as high as pure Ag@AgCl.Furthermore,the composites also exhibited excellent recyclability and stability under both visible and solar light.This work provided a suitable strategy for nano-photocatalysts for practical application and may also offer new possibilities for the high-value utilization of biomass materials.

关键词： Ag@AgCl biological veins photocatalytic activity recyclability

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一种带Cache加速的HyperRAM控制器设计与验证

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现代电子技术 2024年第6期47卷 91-96页

作者：邹敏鲁澳宇邹望辉喻华长沙理工大学物理与电子科学学院湖南长沙410114 广东华芯微特集成电路有限公司湖南长沙410205

针对目前可穿戴设备上对存储设备性能要求高、体积小、功耗低等问题,在FPGA上实现了一款可拓展的高性能HyperRAM控制器,并引入Cache缓存加速设计,以提高对频繁访问数据的命中率和优化存储器访问模式,实现更高速的数据传输和优化的系统... 详细信息

针对目前可穿戴设备上对存储设备性能要求高、体积小、功耗低等问题,在FPGA上实现了一款可拓展的高性能HyperRAM控制器,并引入Cache缓存加速设计,以提高对频繁访问数据的命中率和优化存储器访问模式,实现更高速的数据传输和优化的系统性能。运用UVM验证方法学和FPGA进行验证,结果表明,带有Cache缓存的HyperRAM控制器相较于普通HyperRAM,在读写连续地址时性能提高61%,并具有较好的可靠性与有效性,可为嵌入式系统提供高效、灵活的存储器解决方案。

关键词： HyperRAM控制器 Cache缓存可穿戴设备存储器 UVM验证方法学 FPGA

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Superhydrophobic Surfaces Produced by Applying a Self- Assembled Monolayer to Silicon Micro/Nano-Textured Surfaces

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Nano Research 2009年第2期2卷 143-150页

作者： Yong Song Rahul Premachandran Nair min zou Yongqiang Wang Department of Mechanical Engineering University of ArkansasFayettevilleAR 72701USA Ocean NanoTech LLC.2143 Worth LaneSpringdaleAR 72764USA

A novel way of producing superhydrophobic surfaces by applying a self-assembled monolayer(SAM)to silicon micro/nano-textured surfaces is presented in this paper.The micro/nano-textured surfaces on silicon substrates were generated by the aluminum-induced crystallization(AIC)of amorphous silicon(a-Si)technique.Octadecyltrichlorosilane(OTS)SAMs were then applied to the textured surfaces by dip coating.The topography and wetting properties of the resulting surfaces were characterized using scanning electron microscopy(SEM)and a video-based contact angle measurement system.The results show that by introducing OTS SAMs on the silicon micro/nano-textured surfaces,superhydrophobic surfaces with water contact angles(WCAs)of 155°were obtained,as compared to the WCAs of OTS-modified smooth silicon surfaces of about 112°.Surface topography was found to directly influence the WCA as predicted by the Cassie-Baxter model.

关键词： Superhydrophobic wetting property micro/nano-textured surfaces octadecyltrichlorosilane self-assembled monolayer aluminum-induced crystallization of amorphous silicon

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碳酸水环境下隧道水泥基材料的抗侵蚀特性

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建筑材料学报 2024年第5期27卷 408-417页

作者：李康邹敏王希谢永江刘娟红中国铁道科学研究院研究生部北京100081 中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室北京100081 中国铁道科学研究院集团有限公司铁道建筑研究所北京100081 北京科技大学土木与资源工程学院北京100083

对比了多种水泥基材料在碳酸水加速侵蚀前后的抗压强度、材料内部的物相迁移和孔结构特征.结果表明:碳酸水侵蚀后水泥基材料强度的发展受到限制,Ca(OH)_(2)和CaCO_(3)含量同时降低,孔径粗化且有害孔的比例增大;以水化硅酸钙凝胶和Ca(OH)... 详细信息

对比了多种水泥基材料在碳酸水加速侵蚀前后的抗压强度、材料内部的物相迁移和孔结构特征.结果表明:碳酸水侵蚀后水泥基材料强度的发展受到限制,Ca(OH)_(2)和CaCO_(3)含量同时降低,孔径粗化且有害孔的比例增大;以水化硅酸钙凝胶和Ca(OH)_(2)为主要水化产物的胶凝体系最容易受到碳酸水的侵蚀,且Ca(OH)_(2)含量越高,水泥基材料抗碳酸水侵蚀的能力越弱;以钙矾石为主要水化产物的胶凝体系抗碳酸水侵蚀的能力明显增强.

关键词：隧道水泥基材料碳酸水侵蚀物相分析孔结构 Rietveld法

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空间融合视域下同步课堂教学交互意蕴价值、模型构建与应用研究

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中国电化教育 2024年第5期 105-113页

作者：韦怡彤邹敏田俊王萱周庭江汉大学教育学院湖北武汉430056 华中师范大学人工智能教育学部湖北武汉430079 华南师范大学教育信息技术学院广东广州510631 咸安区教育局湖北咸宁437099

同步课堂通过优化区域资源配置,促进了教学资源的共建共享。当前,随着同步课堂在我国的常态化按需应用,课堂情感交互不足、临场感偏低、学生参与度不高的现状日益显现,成为同步课堂高质量发展亟需解决的问题。该研究基于联通主义理论,... 详细信息

同步课堂通过优化区域资源配置,促进了教学资源的共建共享。当前,随着同步课堂在我国的常态化按需应用,课堂情感交互不足、临场感偏低、学生参与度不高的现状日益显现,成为同步课堂高质量发展亟需解决的问题。该研究基于联通主义理论,依托新兴技术,设计了融合物理空间、虚拟空间和社会交互空间的同步课堂教学空间模型。在剖析同步课堂教学要素和空间特征的基础上,该研究构建了包括人机交互、人际交互和人知交互的同步课堂教学交互模型,并在湖北省咸安区同步课堂开展实践应用。围绕三年级音乐课的课前准备、情境呈现、新知探究、巩固练习、在线展示、总结评价和课后温习七个环节设计了教学交互实施策略,并取得了良好效果。结果发现,教学点和中心校学生在教学交互干预后,学生学习投入度都有所提高,师生情感体验显著改善。

关键词：同步课堂空间融合联通主义教学交互学习投入度

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