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Challenges in determination of microscopic degree of cleanliness in ultra-clean gear steels

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Journal of Iron and Steel Research International 2022年第10期29卷 1583-1600页

作者： D.Fuchs t.tobie k.Stahl Gear Research Center(FZG) Technical University of Munich85748 GarchingGermany

Shot-peened,case-hardened gears can fail in the tooth root due to crack initiation below the surface of the steel ***,the crack is initiated at a non-metallic inclusion in the center of a so-called *** failure type can lead to a reduced endurance fatigue limit of the *** is for this reason that,over the last decade,much effort has been invested by steel manufacturers to reduce the non-metallic inclusion content of gear steels so as to mitigate or even completely prevent such crack *** ultra-clean gear steels were achieved by various measures in the steel production ***,as a result,the remaining non-metallic inclusions are inhomogeneously distributed in the steel volume in terms of both size and ***,due to the inhomogeneity of ultra-clean steels,the question arose if the values derived according to the standards are still representative of ultra-clean steel *** results show that the standards can still be applied,but more effort must be *** determine the degree of cleanliness,six microsections are currently evaluated according to steel test specification(SEP)1571,method *** is shown that an examination of 24 microsections starting from size class 0 seems beneficial to get more reliable and comparable results of the degree of cleanliness of these ultra-clean gear *** addition,it is shown that a high degree of cleanliness has been achieved for all steel batches investigated with the measures taken in the steel production process.

关键词： Degree of cleanliness Non-metallic inclusion Evaluation of inclusion SEP 1571 DIN 50602 Ultrasonic immersion testing Ultra-clean gear steel Gear

the proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2) single-atom catalysts

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Nano Research 2024年第1期17卷 397-406页

作者： Danfeng Wu Shuyun Zhou Congcong Du Juan Li Jianyu Huang Hong-xia Shen Abhaya k.Datye Shan Jiang Jeffrey t.Miller Sen lin Haifeng Xiong State key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China College of Biology and Chemical Engineering Jiaxing UniversityJiaxing 314000China Department of Chemical&Biological Engineering University of New MexicoAlbuquerqueNM 8731-0001USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907-2100USA Innovation Laboratory for Sciences and technologies of Energy Materials of Fujian Province(IkkEM) Xiamen 361102China Fujian key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyan 366300China

the local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).However,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional ***,we prepared two Rh1/CeO_(2)SACs(0.5Rh1/r-CeO_(2)and 0.5Rh1/c-CeO_(2),respectively)using two shaped CeO_(2)(rod and cube)exposing different facets,i.e.,CeO_(2)(111)and CeO_(2)(100).In CO oxidation reaction,the t100 of 0.5Rh1/r-CeO_(2)SACs is 120°C,while the t100 of 0.5Rh1/c-CeO_(2)SACs is as high as 200°*** in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFtS),we found that the proximity between OH group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2)SAC system in CO *** Rh single atom trapped at the CeO_(2)(111)crystal surface forms the Rh1(OH)adjacent species,which is not found on the CeO_(2)(100)crystal surface at room ***,during CO oxidation,the OH group far from Rh single atom on the 0.5Rh1/c-CeO_(2)disappears and forms Rh1(OH)adjacent species when the temperature is above 150°*** formation of Rh1(OH)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2)*** formed Rh1(OH)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°*** functional theory(DFt)calculations validate the unique activity and reaction path of the intermediate Rh1(OH)adjacentCO species *** work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis.

关键词： crystal plane Rh1/CeO_(2)single-atom catalyst proximity of Rh and hydroxyl coordination structure CO oxidation

Light Weight Cryptographic Address Generation(LW-CGA) Using System State Entropy Gathering for IPv6 Based MANEts

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China Communications 2017年第9期14卷 114-126页

作者： Reshmi t.R Murugan k VIt University Anna University

In IPv6 based MANEts, the neighbor discovery enables nodes to self-configure and communicate with neighbor nodes through autoconfiguration. the Stateless address autoconfiguration(SLAAC) has proven to face several security issues. Even though the Secure Neighbor Discovery(SeND) uses Cryptographically Generated Addresses(CGA) to address these issues, it creates other concerns such as need for CA to authenticate hosts, exposure to CPU exhaustion attacks and high computational intensity. these issues are major concern for MANEts as it possesses limited bandwidth and processing power. the paper proposes empirically strong Light Weight Cryptographic Address Generation(LW-CGA) using entropy gathered from system states. Even the system users cannot monitor these system states; hence LW-CGA provides high security with minimal computational complexity and proves to be more suitable for MANEts. the LW-CGA and SeND are implemented and tested to study the performances. the evaluation shows that LW-CGA with good runtime throughput takes minimal address generation latency.

关键词： IPv6 SLAAC EUI-64 CGA SEND system states MANEts

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中国县域医共体研究热点与前沿分析

中国全科医学 2025年第1期28卷 83-88页

作者：王舒云梁夏李霞林琳冯启明黄照权广西医科大学卫生与健康政策研究中心广西壮族自治区南宁市530021 广西医科大学广西壮族自治区南宁市530021

背景推进县域医共体建设是推动构建分级诊疗秩序的重要举措,国内学术界在县域医共体领域开展了丰富的理论和实证研究,但对现有研究成果的归纳与总结不足。运用文献计量学方法系统梳理该领域相关文献的研究进展,可以为全面推进县域医共... 详细信息

背景推进县域医共体建设是推动构建分级诊疗秩序的重要举措,国内学术界在县域医共体领域开展了丰富的理论和实证研究,但对现有研究成果的归纳与总结不足。运用文献计量学方法系统梳理该领域相关文献的研究进展,可以为全面推进县域医共体高质量发展提供借鉴与参考。目的基于中国县域医共体领域的文献数据进行可视化分析,探讨该领域的研究热点和前沿趋势。方法于2024-02-25,系统检索中国知网收录的县域医共体相关文献,检索时限为2016-2023年。采用CiteSpace软件对文献的发表年份、作者和机构,以及关键词共现、聚类、时间线分布、突现等情况开展文献计量学可视化分析。结果共纳入文献481篇,该领域的发文量受政策因素驱动呈递增趋势,2016-2019年发文65篇(13.51%),2020-2021年发文167篇(34.72%),2022-2023年发文249篇(51.77%)。发文量排在前3位的作者分别为陈迎春、王芳、郑英,发文量均为8篇。关键词的中心度和聚类规模排在前2位的是“医共体”和“分级诊疗”。时间线分布提示,“分级诊疗”是该领域出现最早且延续性最好的研究热点,此外,“医防融合”“绩效考核”“对策”“患者”等聚类也为研究热点。关键词突现分析显示,“医保基金”“慢性病”“管理模式”“发展策略”“乡村医生”是该领域近年来的研究热点和未来方向。结论关注分级诊疗制度建设,聚焦慢性病和公共卫生医防融合服务,探索绩效考核路径是县域医共体的研究热点。未来该领域在深化政策内涵研究,以县域医共体建设推动构建分级诊疗秩序、推进医防融合创新、强化绩效考核与优化内部管理领域表现出较强的研究趋势。

关键词：县域医共体分级诊疗文献计量学可视化

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Antimicrobial effects of carnosic acid,kaempferol and luteolin on biogenic amine production by spoilage and food-borne pathogenic bacteria

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Food Bioscience 2022年第2期46卷 882-889页

作者： Ali Serha Ozkütük Yumurtalık Vocational School Department of FisheriesUniversity ofÇukurova01682AdanaTurkey

Antimicrobial effects of carnosic acid,kaempferol and luteolin on biogenic amine(BA)production by five spoilage(Photobacterium damselae,Proteus mirabilis,Enterobacter cloacea,Pseudomonas luteola and Serratia liquefaciens)and five food-borne pathogenic bacteria(Staphylococcus aureus AtCC29213,Enterococcus faecalis AtCC29212,Escherichia coli AtCC25922,Salmonella Paratyphi A NCtC13 and Yersinia enterocolitica NCtC 11175)were *** formation of ammonia(AMN),trimethylamine(tMA)and BAs by all bacterial strains were observed using ornithine decarboxylase ***,AMN,and tMA were determined by using high performance liquid chromatography(HPLC)*** results showed that significant differences were observed(P≤0.05)in formation among spoilage and also food-borne *** impact of phenolic compounds on AMN,tMA and BAs production was dependent on bacterial *** total amount of cadaverine(CAD),putrescine(PUt),histamine(HIS)and tyramine(tYR)was considered,the phenolic compounds presented antimicrobial activity against fish spoliage bacteria and food-borne pathogens following the order;kaempferol>carnosic acid>*** phenolics have potential to be used as food preservatives.

关键词： Carnosic acid kaempferol Luteolin Biogenic amine Food-borne pathogens

国有资产改革对自然资源资产“两权”分离的启示与借鉴

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生态经济 2025年第1期41卷 195-200页

作者：林霖黄志豪康琴陈丹张敏王珂虞舟鲁中国计量大学人文与外语学院浙江杭州310018 浙江数治空间规划设计有限公司浙江杭州310030 浙江省测绘科学技术研究院浙江杭州310007 浙江大学环境与资源学院浙江杭州310058

我国国有资产管理体制经过了从统一到分散再到统一的改革历程。在此过程中,国务院设立国有资产监督管理委员会,并逐步推动国有资产管理方式从以管企业为主向以管资本为主转变,探索了国有资产所有权与监管权“两权”分离的路径。鉴于自... 详细信息

我国国有资产管理体制经过了从统一到分散再到统一的改革历程。在此过程中,国务院设立国有资产监督管理委员会,并逐步推动国有资产管理方式从以管企业为主向以管资本为主转变,探索了国有资产所有权与监管权“两权”分离的路径。鉴于自然资源资产管理与国有资产管理存在较强相似性,国有资产投资运营公司在促进国有资产“两权”分离中的关键作用,为自然资源资产所有权与监管权的分离提供了重要启示和借鉴。自然资源资产管理在完成委托代理机制试点后,建议管理方式由“资源管理”逐步转向“资产管理”,授权设立自然资源投资运营公司,以实现自然资源资产“两权”的有效分离,从“自然资源部门—自然资源资产”的二级管理体制转变为“自然资源部门—自然资源投资运营公司—自然资源资产”的三级管理体制,以期为推进自然资源资产的有效监管和资产增值提供改革思路与参考。

关键词：国有资产改革自然资源资产 “两权”分离投资运营公司

R2R3-MYB transcription factors, StmiR858 and sucrose mediate potato flavonol biosynthesis

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Horticulture Research 2021年第1期8卷 378-390页

作者： Sen lin Rajesh k.Singh Moehninsi Duroy A.Navarre Irrigated Agriculture Research and Extension Center Washington State UniversityProsserWAUSA USDA-Agricultural Research Service ProsserWAUSA Present address:Department of Biotechnology CSIR-Institute of Himalayan Bioresource TechnologyPalampurHimachal Pradesh 176061India

Flavonols and other phenylpropanoids protect plants from biotic and abiotic stress and are dietarily desirable because of their health-promoting *** ability to develop new potatoes(Solanum tuberosum)with optimal types and amounts of phenylpropanoids is limited by lack of knowledge about the regulatory *** sucrose increased flavonols,whereas overexpression of the MYB StAN1 induced sucrolytic gene *** StAN1 protein bound promoter fragments from sucrolytic genes(SUSY1 and INV1).two additional MYBs and one microRNA were identified that regulated potato *** analysis showed MYB12A and C increased amounts of flavonols and other *** flavonol amounts in light-exposed organs were much higher those in the *** levels of StMYB12A and C were high in flowers but low in *** overexpression of miR858 altered potato flavonol *** StmiR858 expression was much lower in flowers than leaves and correlated with flavonol amounts in these ***,these findings support the hypothesis that sucrose,MYBs,and miRNA control potato phenylpropanoid metabolism in a finely tuned manner that includes a feedback loop between sucrose and *** findings will aid in the development of potatoes with phenylpropanoid profiles optimized for crop performance and human health.

关键词： properties. finding media

Active sorting of orbital angular momentum states of light with a cascaded tunable resonator

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Light(Science & Applications) 2020年第1期9卷 1904-1913页

作者： Shibiao Wei Stuart k.Earl Jiao lin Shan Shan kou Xiao-Cong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityVictoria 3086Australia School of Engineering RMIT UniversityMelbourneVictoria 3001Australia School of Physics The University of MelbourneTin AlleyMelbourneVictoria 3010Australia

the orbital angular momentum(OAM)of light has been shown to be useful in diverse fields ranging from astronomy and optical trapping to optical communications and data ***,one of the primary impediments preventing such applications from widespread adoption is the lack of a straightforward and dynamic method to sort incident OAM states without altering the ***,we report a technique that can dynamically filter individual OAM states and preserve the incident OAM states for subsequent *** the working principle of this technique is based on resonance,the device operation is not limited to a particular *** states with different wavelengths can resonate in the resonator without any additional modulation other than changing the length of the ***,we are able to demonstrate a reconfigurable OAM sorter that is constructed by cascading such optical *** approach does not require specially designed components and is readily amenable to integration into potential applications.

关键词： resonator tunable momentum

Enhancing strength and plasticity by pre-introduced indent-notches in Zr36Cu64 metallic glass:A molecular dynamics simulation study

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Journal of Materials Science & technology 2020年第8期36卷 119-125页

作者： Shidong Feng lin Li k.C.Chan Lei Zhao Limin Wang Riping Liu State key Laboratory of Metastable Materials Science and technology Yanshan UniversityQinhuangdao066004China Advanced Manufacturing technology Research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic University999077Hong KongChina Department of Metallurgical and Materials Engineering The University of AlabamaTuscaloosaAL35487USA

the deformation behavior in Zr36 Cu64 metallic glasses with pre-introduced indent-notches has been studied by molecular dynamics simulation at the atomic *** indent-notches can trigger the formation of densely-packed clusters composed of solid-like atoms in the indent-notch affected *** denselypacked clusters are highly resistant to the nucleation of shear ***,there is more tendency for the shear bands to nucleate outside the indent-notch affected zone,which enlarges the deformation region and enhances both the strengthening effect and the plastic deformation *** indent-notched MGs,when determining the initial yielding level,there is a competition process occurring between the densely-packed clusters leading to the shear band formation outside the indent-notch affected zone and the stress-concentration localizing deformation around the notch *** the indent-notch depth is small,the stress-concentration around the notch root plays a dominant role,leading to the shear bands initiating from the notch root,reminiscence of the *** the indent-notch depth increases,there are many densely-packed clusters with high resistance to deformation in the indent-notch affected zone,leading to the shear band formation from the interface between the indent-notch affected zone and the *** research findings provide a feasible means for improving the strength and the plasticity of metallic glasses at room temperature.

关键词： Metallic glass Notch Shear band Microstructure Molecular dynamics simulation