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Shielding AZ91D-1%Ca from corrosion through ultrasound melt treatment:A study for stent design

Journal of Magnesium and Alloys 2023年第8期11卷 2901-2915页

作者： I.V.Gomes M.Pacheco M.Nienaber S.C.Neves D.Mei A.Barros R.l.Reis J.l.Alves H.Puga CMEMS–UMinho University of MinhoGuimarãesPortugal lABBElS–Associate laboratory BragaGuimarãesPortugal B's Research Group-Research Institute on Biomaterials Biodegradables and BiomimeticsUniversity of MinhoHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineAvepark-Parque de Ciência e TecnologiaBarco GuimarãesPortugal ICVS/3B's-PT Government Associate laboratory BragaGuimarãesPortugal Institute of Material and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany School of Materials Science and Engineering&Henan Key laboratory of Advanced Magnesium Alloy Zhengzhou UniversityZhengzhou 450001China

Magnesium-based materials show great potential for producing biodegradable stents,but their high corrosion rates are a *** study investigates whether ultrasound melt treatment can change the corrosion response of an extruded AZ91D-1.0%Ca(wt.%)in Earle's Balanced Salt Solution by tailoring the intermetallics'morphology in the as-extruded *** results showed that the wires from ultrasound-treated ingots corroded faster than non-treated ones in immersion for up to 6 *** trend shifted for longer periods,and ultrasound-treated material showed lower corrosion rates and uniform corrosion,while the non-treated material displayed localized corrosion *** testing of the wires demonstrated that immersion in EBSS lowered the tensile strength and elongation at fracture due to material degradation,regardless of the processing ***,this decline was sharper in the non-treated *** findings suggest that ultrasound melt processing can be a promising method for improving the corrosion resistance of magnesium-based materials,paving the way for their use in manufacturing biodegradable stents.

关键词： Magnesium Ultrasound treatment Stent Corrosion Mechanical properties

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Can Talent Policies Attract Population Inflows?—An Empirical Analysis Based on Spatial Panel Modeling

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Journal of Systems Science and Information 2023年第6期11卷 726-744页

作者： Xiaohong JIN Jian XU Cuihong YANG Qingyun lü School of Economics and Management University of Chinese Academy of SciencesBeijing 100049China Academy of Mathematics and Systems Sciences Chinese Academy of SciencesBeijing 100190China School of Economics and Management University of Chinese Academy of Sciences School of Business The University of WarwickCoventry CV48UWUnited Kingdom

To analyze the spatial influence mechanism of talent policy on population flow, this study compares the government work reports of 31 provinces between 2008 and 2020, and quantifies regional talent policies in nine aspects, including talent evaluation and incentives, utilizing a comprehensive, standardized, and continuous approach. Additionally, this paper develops a spatial econometric analysis model and expands on the conventional neighborhood, distance, and economic matrices by constructing a spatial weight matrix that reflects talent flow. The findings indicate that population movement exhibits spatial clustering patterns. The regional government's talent policy, primarily based on talent evaluation and incentives, positively influences population inflow. Moreover, during the implementation of talent policies, local governments demonstrate cooperative relationships. The inter-regional spillover effect between talent evaluation and talent incentives is significantly positive. In other words, a stronger local talent evaluation policy, along with robust talent incentives, encourages population inflow from neighboring provinces. However, this conclusion may vary in different regions and over time. Recently, the spatial spillover effect of population inflow and the impact of talent policies have not shown significant results. Additionally, the attractiveness of talent evaluation in the eastern region surpasses that of talent incentives, while the opposite holds true for the central and western regions. This study investigates the impact of local government talent policies on population inflow and its spatial spillover effect, offering theoretical support for intergovernmental cooperation.

关键词： talent policy population mobility spatial econometric modeling

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Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta-aramid composite paper

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High Voltage 2023年第4期8卷 760-771页

作者： Haoou Ruan Qing Xie Jingxuan Song Shenghui Wang Xiaobin Chang Yuqin Xu Fangcheng lü State Key laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Ganzhou longpunt Material Technology Co. LtdGanzhouChina

Organophilic groups of coupling agents can be the key factor for the electrical performance of Boron Nitride(BN)/meta-aramid composite *** this article,four types of triethoxy-silane coupling agents with different organophilic groups,including mercaptopropyl(MP),glycidylether-propyl(GP),amino-propyl(AP)and trideca-fluoro-octyl(TFO)were *** structural and electrical properties of modified papers were compared,and the molecular simulation was conducted to reveal the interface interaction of modified BN and *** results show that AP,GP and MP follow the same mechanism,improving the electrical performance by modifying the interface stability and paper structure,and the ranks of improving effects are AP,MP and ***,TFO mainly relies on the fluorine components to implement the electrical reinforcement,which compensates for the shortcoming in the paper *** choosing TFO and filler content of 15 wt%,the optimal breakdown strength of the paper can be increased to 28.17 kV/mm,1.8 times that of the paper doped with the hydroxylated BN.

关键词： composite electrical coupling

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Deep learning-based analysis of macaque corneal sub-basal nerve fibers in confocal microscopy images

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Eye and Vision 2020年第1期7卷 255-265页

作者： Jonathan D.Oakley Daniel B.Russakoff Megan E.McCarron Rachel l.Weinberg Jessica M.Izzi Stuti l.Misra Charles N.McGhee Joseph l.Mankowski Voxeleron llC San FranciscoCAUSA Department of Molecular and Comparative Pathobiology Johns Hopkins University School of MedicineBaltimoreMDUSA Department of Ophthalmology Faculty of Medical and Health SciencesNew Zealand National Eye CentreUniversity of AucklandAucklandNew Zealand

Background:To develop and validate a deep learning-based approach to the fully-automated analysis of macaque corneal sub-basal nerves using in vivo confocal microscopy(IVCM).Methods:IVCM was used to collect 108 images from 35 macaques.58 of the images from 22 macaques were used to evaluate different deep convolutional neural network(CNN)architectures for the automatic analysis of sub-basal nerves relative to manual *** remaining images were used to independently assess correlations and interobserver performance relative to three ***:Correlation scores using the coefficient of determination between readers and the best CNN averaged *** inter-observer comparison,inter-correlation coefficients(ICCs)between the three expert readers and the automated approach were 0.75,0.85 and *** ICC between all four observers was 0.84,the same as the average between the CNN and individual ***:Deep learning-based segmentation of sub-basal nerves in IVCM images shows high to very high correlation to manual segmentations in macaque data and is indistinguishable across *** quantitative measurements of corneal sub-basal nerves are important biomarkers for disease screening and management,the reported work offers utility to a variety of research and clinical studies using IVCM.

关键词： Cornea Sensory nerves Macaque Deep learning In vivo confocal microscopy

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Substrate Evolution to Microstructural and Optoelectrical Properties of Evaporated CdS Thin Films Correlated with Elemental Composition

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Acta Metallurgica Sinica(English letters) 2021年第9期34卷 1307-1316页

作者： Anuradha Purohit Himanshu S.l.Patel S.Chander M.S.Dhaka Department of Physics Mohanlal Sukhadia UniversityUdaipur 313001India Department of Chemical Sciences Indian Institute of Science Education and Research.Mohali 140306India Centre for Advanced Study in Physics Department of PhysicsPanjab UniversityChandigarh 160014India

A typical high-e fficiency solar cell device needs the best lattice matching between different constituent layers to mitigate the open-circuit voltage loss. In the present work, the physical properties of CdS thin films are investigated where films with 100 nm thickness were fabricated on the different types of substrates viz. soda–lime glass, indium-doped tin oxide(ITO)-and fl uorine-doped tin oxide(FTO)-coated glass substrates, and silicon wafer using electron beam evaporation. The X-ray diffraction patterns confirmed that deposited thin films showed cubic phase and had(111) as predominant orientation where the structural parameters were observed to be varied with nature of substrates. The ohmic behaviour of the CdS films was disclosed by current–voltage characteristics, whereas the scanning electron microscopy micrograph revealed the uniform deposition of the CdS films with the presence of round-shaped grains. The elemental analysis confirmed the CdS films deposition where the Cd/S weight percentage ratio was changed with nature of substrates. The direct energy band gap was observed in the 1.63–2.50 eV range for the films grown on different substrates. The investigated properties of thin CdS layers demonstrated that the selection of substrate(in terms of nature) during device fabrication plays a crucial role.

关键词： CdS thin films Substrate evolution E-beam evaporation Microstructural properties Optoelectrical properties

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Exogenous nitrogen input skews estimates of microbial nitrogen use efficiency by ecoenzymatic stoichiometry

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Ecological Processes 2023年第1期12卷 625-631页

作者： lifei Sun Daryl l.Moorhead Yongxing Cui Wolfgang Wanek Shuailin li Chao Wang CAS Key laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Department of Environmental Sciences University of ToledoToledo 43606USA Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Division of Terrestrial Ecosystem Research Center of Microbiology and Environmental Systems ScienceUniversity of ViennaDjerassiplatz 11030 ViennaAustria

Background Ecoenzymatic stoichiometry models(EEST)are often used to evaluate microbial nutrient use efficiency,but the validity of these models under exogenous nitrogen(N)input has never been ***,we investigated the effects of long-term N addition(as urea)on microbial N use efficiency(NUE),compared EEST and^(18)O-labeling methods for determining NUE,and evaluated EEST’s theoretical assumption that the ratios of standard ecoenzymatic activities balance resource availability with microbial *** We found that NUE estimated by EEST ranged from 0.94 to *** contrast,estimates of NUE by the^(18)O-labeling method ranged from 0.07 to *** large differences in NUE values estimated by the two methods may be because the sum ofβ-N-acetylglucosaminidase and leucine aminopeptidase activities in the EEST model was not limited to microbial N acquisition under exogenous N inputs,resulting in an overestimation of microbial NUE by *** addition,the acquisition of carbon by N-acquiring enzymes also likely interferes with the evaluation of NUE by *** Our results demonstrate that caution must be exercised when using EEST to evaluate NUE under exogenous N inputs that may skew standard enzyme assays.

关键词： Extracellular enzyme Resource allocation Nitrogen addition Microbial metabolism limitation Isotope labeling

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软黏土基坑开挖诱发坑外地表沉降的时效解

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岩土工程学报 2024年第10期46卷 2041-2050页

作者：应宏伟熊一帆李冰河吕唯程康张金红河海大学岩土力学与堤坝工程教育部重点实验室江苏南京210024 浙江大学滨海和城市岩土工程研究中心浙江杭州310058 浙江省建筑设计研究院浙江杭州310006 中铁十一局集团有限公司湖北武汉430061

对比理论和实测研究成果,发现既有坑外地表沉降计算方法不适用于蠕变效应显著的软土基坑。借助lame方程和三参量黏弹性地基模型,推导得到柔性挡墙任意变位诱发坑外地表沉降的时效半解析解;将理论计算方法应用于杭州软土地区的两个深基... 详细信息

对比理论和实测研究成果,发现既有坑外地表沉降计算方法不适用于蠕变效应显著的软土基坑。借助lame方程和三参量黏弹性地基模型,推导得到柔性挡墙任意变位诱发坑外地表沉降的时效半解析解;将理论计算方法应用于杭州软土地区的两个深基坑工程实例,分析了从基坑开挖到地下室回筑的施工全过程中坑外地表沉降的发展规律。结果表明:(1)软土蠕变诱发不依赖于挡墙附加侧移的地表沉降,不仅导致软土基坑开挖期间的地表最大沉降与挡墙最大侧移之比远大于非软土基坑,而且引起坑外土体在地下室回筑期的持续沉降;(2)软土蠕变诱发的地表沉降随挡墙侧移的增大而增大,表现为凹槽沉降模式;(3)深厚软土深基坑的地表最大沉降与挡墙最大侧移之比主要受软土蠕变性和施工时间等因素的影响,与挡墙侧移量的关系不明显。

关键词：基坑开挖地表沉降软黏土蠕变时效解

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临床数据交换标准协会体系及其应用现状

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中国公共卫生 2024年第2期40卷 227-233页

作者：王泽陈浩陈佳齐武睿婕李紫琳李雨菲张媛吕明山东大学齐鲁医学院公共卫生学院流行病与卫生统计学系济南250012 山东大学齐鲁医院临床流行病学研究室济南250012 山东大学临床研究中心济南250012

临床数据交换标准协会(CDISC)是全球性的非营利性标准开发组织,其基于临床研究的共识创建了一套标准体系,主要包括核心标准、数据交换标准、受控术语集和治疗领域标准四大方面,各类标准在研究中的角色不同,贯穿于研究流程的各个环节。... 详细信息

临床数据交换标准协会(CDISC)是全球性的非营利性标准开发组织,其基于临床研究的共识创建了一套标准体系,主要包括核心标准、数据交换标准、受控术语集和治疗领域标准四大方面,各类标准在研究中的角色不同,贯穿于研究流程的各个环节。伴随着自动化软件的开发,国际监管机构和大型药物研发企业已实现CDISC标准的应用,该标准体系在国内逐渐得到认可和推广,专业技术服务亦正在逐步开展和普及。本文详细介绍了CDISC标准体系下的各类标准及其关系和应用流程,总结国内外应用现状并提出建议,以期为相关研究的标准化建设提供重要参考。

关键词：临床数据交换标准协会(CDISC) 体系应用现状

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Effect of specimen gauge reduction on uniaxial tension properties of reinforcing steel

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Journal of Iron and Steel Research International 2020年第8期27卷 964-971页

作者： A.Triwiyono A.l.Han A.Aryanto S.Tudjono B.S.Gan Civil Engineering Department Gadjah Mada UniversitySleman 55283YogyakartaIndonesia Civil Engineering Department Diponegoro UniversityTembalang 50275SemarangIndonesia Civil Engineering Department Bandung Institute of TechnologyCoblong 40132BandungIndonesia Department of Architecture College of EngineeringNihon UniversityKoriyama 963-8642Fukushima PrefectureJapan

The Standard Test Methods for Tension Testing of Metallic Materials (ASTM E8) mandates a specimen gauge reduction for obtaining the tensile properties of reinforcing steel bars. The standard outlines the specimen preparation requirements and methods to ensure that test results well represent the material properties. On the other hand, some codes differ regarding the approach to specimen preparation. They do not apply gauging, for both deformed and plain steel bars. Thus, the effect of specimen gauge reduction on the tensile properties of reinforcing steel bars was evaluated, and the interconnection of properties to the layer hardness was analysed. The experiment governed a range of deformed hot-rolled bar sizes, tested in tension using precision instruments. The Rockwell hardness test was implemented layerwise on the specimen’s cross section, and the hardness number (HRC) was measured as a function of the layer distance to the centre. A finite element model was constructed to study the stress concentrations induced by a constant indentation, simulating the HRCs, and to numerically construct the stress–strain relationship of ungauged steel bars based on the core properties and the section HRC relationship. Scanning electron microscopy readings were performed to visually and chemically justify the results. It was shown that the specimen gauge reduction significantly influenced the resulting stress–strain behaviour of the material, and the yield and ultimate strengths were reduced. It was also demonstrated that the hardness response is proportional to the distance to the specimen’s axes. The corresponding yield and ultimate strengths thus increased accordingly, from the inner to the outer layers of the bar. Testing a gauged specimen will therefore result in lower strength than that of an ungauged steel bar.

关键词： Tensile property Specimen gauge reduction Rockwell hardness number Finite element model Reinforcing steel

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Discovery of prenylated indole alkaloid and natural xanthone from cold-seep sediment derived fungus Talaromyces funiculosus SD-523

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Journal of Oceanology and limnology 2023年第3期41卷 1152-1158页

作者： Yanan WANG Xiaoming lI Fengyi lÜ Suiqun YANG linghong MENG Bingui WANG CAS and Shandong Province Key laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of SciencesQingdao 266071China College of Marine Science University of Chinese Academy of SciencesBeijing 100049China laboratory of Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

A new prenylated indole alkaloid 11,17-epi-mangrovamide A(1),a new natural occurring product,1,7-dihydroxy-6-methyl-8-hydroxymethyl-xanthone(2),two known alkaloids,mangrovamide A(3)and mangrovamide G(4),and four known polyketide derivatives(5–8)were isolated and identified from the cold-seep sediment derived fungal strain Talaromyces funiculosus *** structures were elucidated by combination of nuclear magnetic resonance(NMR),high resolution electrospray ionization mass spectroscopy(HRESIMS),quantum chemical electronic circular dichroism(ECD),and DP4+probability analysis as well as by comparison of the data with literature *** isolated compounds were tested for antibacterial activities.

关键词： Talaromyces funiculosus cold seep prenylated indole alkaloid antimicrobial activity

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