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Inf.uence of.graphene nanoplatelets on mechanical properties and adhesive wear perf.rmance of.epoxy-based composites

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f.iction 2021年第4期9卷 856-875页

作者： K.Y.EAYAL AWWAD B.f.YOUSIf.Khosro f.LLAHNEZHAD Khalid SALEH Xuesen ZENG f.culty of.Health Engineering and SciencesUniversity of Southern QueenslandToowoombaQLDAustralia Centre f.r f.ture Materials University of Southern QueenslandToowoombaQLDAustralia School of.Mechanical and Mining Engineering University of QueenslandBrisbaneQLDAustralia

Epoxy resin is one of.the most widely used thermoset polymers in high-perf.rmance composite materials f.r lightweight ***,epoxy has a high coef.icient of.f.iction,which limits its tribological *** this study,the ef.ect was investigated of.dif.erent weight f.actions of.solid lubricant graphene nanoplatelets(GNPs),ranging f.om 0 to 4.5 wt%,on mechanical and adhesive wear perf.rmance of.*** wear tests covered mild and severe wear *** correlation of.tribological and mechanical properties was studied as *** electron microscopy(SEM)was used to observe the f.ilure mechanisms f.r both tribological and mechanical samples af.er each *** results revealed that the addition of.GNPs to the epoxy improved its stif.ness and hardness but reduced its f.acture strength and *** wear perf.rmance exhibited high ef.iciency with GNP additions and showed reductions in the specif.c wear rate,the coef.icient of.f.iction,and the induced interf.ce temperature by 76%,37%,and 22%,respectively.A f.tigue wear mechanism was predominant as the applied load *** importantly,severe wear signs occurred when the interf.ce temperature reached the heat distortion temperature of.the *** tribological,and mechanical properties showed only a weak correlation to each *** addition of.GNPs to epoxy by less than 4.5 wt%was highly ef.icient to improve the wear perf.rmance while maintaining the f.acture strength and *** transf.rm inf.ared spectroscopy(f.IR)analysis shows no chemical interaction between the epoxy matrix with GNPs,which implies its physical interaction.

关键词： graphene nanoplatelets epoxy adhesive wear solid lubricants

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No Sustainability without Technical, f.scal and Social Innovation

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Chinese Journal of.Population,Resources and Environment 2007年第3期5卷 9-15页

作者： Schmidt-Bleek f.Cheng Yiheng f.ctor 10 Institute La Rabassiere Carrere des Bravengues F-83660 Carnoules Provence France Quanta K＆M Consulting Co. Kunshan Yangzhou Jiangsu 215341 China

Of.icially, the environmental protection f.om industrial insults began with Rachel Carson＇s book ＂The Silent Spring＂ in 1963. Protection priorities have since changed. They can be grouped into three successive phases.

关键词：中国技术创新社会变革财政收入环境保护生物圈疾病臭氧层破坏

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青年谢林与康德

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世界哲学 1985年第2期 44-51页

作者： f.马蒂周文彰美国南伊利诺斯大学荣誉教授

1775年1月27日,谢林生于斯图加特以西六英里的莱昂贝格。1777年他父亲辞去牧师职务,从莱昂贝格迁到贝本豪森——图宾根以北三英里,在一所培养未来神学家的预科学校任教授。谢林10岁被送进一所颇为著名的拉丁语学校读书,地处尼卡河的尼廷... 详细信息

1775年1月27日,谢林生于斯图加特以西六英里的莱昂贝格。1777年他父亲辞去牧师职务,从莱昂贝格迁到贝本豪森——图宾根以北三英里,在一所培养未来神学家的预科学校任教授。谢林10岁被送进一所颇为著名的拉丁语学校读书,地处尼卡河的尼廷根,在图宾根和斯图加特之间。两年之后他通过了全部课程而回到家里。尽管还不足12岁,但他已获准在贝本豪森上课读书,而规定年龄是14岁。第一次作业是一篇论文:论圣经的神圣起源的主要证明。他用自己作的拉丁文六音步诗给论文润色,交于1786年10月20日。当然他也学习希腊文、希伯来文,甚至还学了一点阿拉伯文。1790年15岁时被录取为图宾根神学

关键词：谢林黑格尔自然哲学批判主义康德独断主义费希特青年

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In-situ synchrotron high energy X-ray dif.raction study on the internal strain evolution of.D019-α2 phase during high-temperature compression and subsequent annealing in a TiAl alloy

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Journal of.Materials Science & Technology 2023年第32期163卷 212-222页

作者： X.Liu L.Song A.Stark f.Pyczak T.B.Zhang State Key Laboratory of.Solidif.cation Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU Chongqing Northwestern Polytechnical UniversityChongqing 400000China Institute of.Materials Physics Helmholtz-Zentrum HereonMax Planck-Str.1Geesthacht 21502Germany

The residual stress in the D019-α2 phase is known to be signif.cantly higher than that in the L10-γphase in TiAl alloys af.er def.rmation due to the poor plasticity and strong mechanical anisotropy of.theα2 ***,the internal stress accumulation and relaxation in theα2 phase during high-temperature def.rmation and annealing are scarcely *** this study,f.r the f.rst time,the internal strain evolution and load partitioning between theα2 andγphases at high temperatures are characterized by in-situ synchrotron high energy X-ray dif.raction(HEXRD)*** plastic def.rmation is at least initiated at a stress of.roughly 200 MPa in theγphase and 775 MPa in theα2 *** intergranular strains in theα2 phase are generated by the onset of.dislocation glide in theγphase,and accentuated with the accumulated dislocations and the ensuing twinning *** unloading,great intergranular strains are preserved in theα2 phase constrained by the heavily plastically def.rmedγ*** subsequent heating f.om 400 to 1000℃,the internal strains in theα2 phase are almost f.lly relaxed by substantial dislocation annihilation and rearrangement in theγ*** annealing at 800℃,the internal strain relaxation is rapid in the initial 10 min,whereas considerably retarded *** extent of.relaxation af.er holding at 800℃f.r 1 h is equivalent to that of.heating in an ef.ective temperature range of.680-880℃f.r 10 *** in-situ lattice strain measurements with various thermal relaxation schemes provide guidance f.r the stress relief.annealing of.TiAl components.

关键词： TiAl alloys Synchrotron radiation Intergranular strain Stress relaxation

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A Note on Pad Approximants Pairs as Limits of.Algebraic Polynomials Pairs of.Weighted Best Approximation in Orlicz Spaces

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Analysis in Theory and Applications 2015年第3期31卷 253-259页

作者： f.E.Levis Departamento de Matemtica Universidad Nacional de Río Cuarto

In this short note, we show the behavior in Orlicz spaces of.best approximations by algebraic polynomials pairs on union of.neighborhoods, when the measure of.them tends to zero.

关键词： Best approximation pair Pad′e approximant pair Orlicz spaces.

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INTERACTIVE MULTICRITERIA DECISION MAKING MODEL f.R INDUSTRIAL SYSTEMS MANAGEMENT

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模糊系统与数学 1990年第2期 79-86页

作者： K.f.KOVALCHUK Department of.Economic Inf.rmation Processing Dniepropetrovsk Metallurgical Institute USSR

A new interactive multieriteria decision making model is presented in this paper. The man-machine decision making process is based on the selection type of.composition which corresponds to the f.llowing noncontradiction level of.decision maker’s (DM) pref.rences. f.r them we propose more common composition operation and def.nition transitivity property of.the f.zzy binary relations. This approach may be used f.r modelling all management f.nctions of.industrial systems (IS).

关键词： INTERACTIVE MULTICRITERIA DECISION MAKING MODEL f.R INDUSTRIAL SYSTEMS MANAGEMENT

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博物馆、系统和计算机

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国际博物馆 2016年第Z1期 39-42页

作者：邓肯.f.卡梅隆程琳

在将博物馆和计算机视为一个系统之前,应该首先将博物馆视为一个独立的系统。如果只有一类博物馆或任何一类博物馆都可视作一个系统,事情则会简单很多。而事实正相反,每个博物馆都由错综复杂的不同系统构成,它们若能统一协调运作,则能... 详细信息

在将博物馆和计算机视为一个系统之前,应该首先将博物馆视为一个独立的系统。如果只有一类博物馆或任何一类博物馆都可视作一个系统,事情则会简单很多。而事实正相反,每个博物馆都由错综复杂的不同系统构成,它们若能统一协调运作,则能达到最佳效果,但通常它们都处在竞争或冲突之中,或者至少不能相互协调运作。《观点:博物馆作为交流系统对博物馆教育的启示》~1一文试图开启有关本话题的讨论。在此我要补充的是。

关键词：博物馆藏品加拿大参观者附录博物院文化机构北美洲书籍结构计算机联合目录

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Comparative analysis of.extreme ultraviolet solar radiation proxies during minimum activity levels

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Earth and Planetary Physics 2023年第5期7卷 540-547页

作者： A.G.Elias C.R.Martinis B.f.de Haro Barbas f.D.Medina B.S.Zossi M.f.gre T.Duran Laboratorio de Ionosf.ra Atmosfera Neutra y MagnetosferaFacultad de Ciencias Exactas y Tecnologia(FACET)Universidad Nacional de Tucuman(UNT)Tucuman 4000Argentina Instituto de f.sica del Noroeste Argentino Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)-UNTTucuman 4000Argentina Center f.r Space Physics Astronomy DepartmentBoston UniversityMA 02215USA CONICET Tucuman 4000Argentina Laboratorio de Telecomunicaciones Departamento de ElectricidadElectrónica y ComputaciónFACETUNTTucuman4000Argentina Departamento de f.sica Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Instituto de f.sica del Sur CONICET-UNSBahia Blanca 8000Argentina

f.ur extreme ultraviolet(EUV)solar radiation proxies(Magnesium II core-to-wing ratio(MgII),Lymanαf.ux(f.),10.7-cm solar radio f.ux(f.0.7),and sunspot number(Rz))were analyzed during the last f.ur consecutive solar activity minima to investigate how they dif.er during minimum periods and how well they represent solar EUV *** variability within each minimum and between minima was compared by considering monthly means.A comparison was also made of.their role in f.ltering the ef.ect of.solar activity f.om the critical f.equency of.the ionospheric f. layer,f.f.,which at mid to low latitudes depends mainly on EUV solar *** last two solar cycles showed unusually low EUV radiation levels according to the f.ur *** the connection between the EUV“true”variation and that of.solar proxies,according to the f.f. f.ltering analysis,MgII and f.behaved in a more stable and suitable way,whereas Rz and f.0.7 could be overestimating EUV levels during the last two minima,implying they would both underestimate the inter-minima dif.erence of.EUV when compared with the f.rst two minima.

关键词： solar EUV radiation solar minimum f.f. solar activity solar EUV proxy

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IEEE社区服务工程项目庆祝服务15周年

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科技纵览 2024年第6期 54-54页

作者： Ashley f.Moran IEEE EPICS

自1995年在普渡大学成立以来,IEEE社区服务工程项目(EPICS)始终在为非营利机构提供技术,改善和实现社区服务,同时扩展电子工程本科生的实践经验。2009年,社区服务工程项目作为教育活动项目引入IEEE,资金来自IEEE新倡议委员会的种子基金。

关键词：社区服务非营利机构普渡大学工程项目种子基金项目引入 IEEE 本科生

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Y^(3+) substituting-adjusted mechanical,dielectric,and impedance properties of.cobalt copper zinc nanof.rrites f.r high f.equency applications

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Journal of.Rare Earths 2023年第10期41卷 1597-1605,I0005页

作者： S.f.Mansour N.S.Al-Bassami M.Af.f. M.A.Abdo Physics Department Faculty of ScienceZagazig UniversityZagazigEgypt General Studies Department Jubail Industrial CollegeJubail Industrial CitySaudi Arabia f.culty of.Nanotechnology f.r Postgraduate Studies Cairo UniversityEl-Sheikh Zayed12588Egypt

Upgrading mechanical-dielectric f.atures of.f.rrites through rare-earth yttrium(Y^(3+))doping provides f.asibility to evolving high-f.equency electronic *** paper reports the mechanical and dielectric properties of.Co_(0.5)Cu_(0.25)Zn_(0.25)Y_(x)f._(2-x)O_(4)f.rrite nanoparticles labeled as CCZYf.0,CCZYf.1,CCZYf.2,CCZYf.3,CCZYf.4 and CCZYf.5 f.r x=0.***.0.02,0.04,0.06,0.08,and 0.1,*** f.equency and temperature dependence of.dielectric parameters and co nductivity of.all CCZYf.nanof.rrites are well *** nanof.rrite CCZYf.5 has the highest dielectric constant(enhancing ratio 170%)and the highest conductivity(enhancing ratio 7125.81%)compared with the undoped *** plots of.all CCZYf.nano f.rrites manif.st two arcs;the main reasons f.r the dielectric process are the grain boundaries and bulk *** impedance parameters were determined,which showed the ef.ective role of.Y^(3+)ions on their *** nanof.rrite CCZYf.5 has the highest grain boundaries capacitance(with enhancing ratio of.59.40%)and the highest grains capacitance(with enhancing ratio of.22.53%)with a relaxation time decrement ef.iciency of.62.51%.An ultrasonic f.aw detector was utilized to determine the elastic moduli of.all CCZYf.*** nanof.rrite CCZYf.5 has the highest longitudinal modulus(with enhancing ratio of.20.95%),the highest shear modulus(with enhancing ratio of.8.72%),highest Young's modulus(with enhancing ratio of.88.47%),the highest bulk modulus(with enhancing ratio 13.27%)and the highest micro hardness(with enhancing ratio 77.77%).Hence,Y3+tuned Co-Cu-Zn nanof.rrites possess new opportunities f.r high-f.equency and storage applications.

关键词： Nanof.rrites Rare arth ions Mechanical properties Dielectric parameters Impedance spectroscopy

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