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Formability of Materials with Small Tools in Incremental Forming

Chinese Journal of Mechanical Engineering 2020年第4期33卷 150-158页

作者： Hongyu Wei G.Hussain X.Shi b.b.l Isidore Mohammed Alkahtani Mustufa Haider Abidi College Mechanical&Electrical Engineering Nanjing University of Aeronautics&AstronauticsNanjingPeople’s Republic of China Faculty of Mechanical Engineering GIK Institute of Engineering Sciences&TechnologyTopi 23460Pakistan College of Mechanical Engineering Shanghai University of Engineering ScienceShanghaiPeople’s Republic of China bradenburg University of Technology CottbusGermany Industrial Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia Advanced Manufacturing Institute King Saud UniversityRiyadh 11421Saudi Arabia

Single point incremental forming(SPIF)is an innovative sheet forming process with a high economic *** formability in this process can be maximized by executing forming with a tool of specific small radius,regarded as threshold critical *** value has been reported as 2.2 mm for 1 mm thick sheet ***,with a change in the forming conditions specifically in the sheet thickness and step size,the critical radius is likely to alter due to a change in the bending *** main aim of the present study is to undertake this point into account and develop a relatively generic *** study is composed of experimental and numerical *** maximum wall angle(θmax)without sheet fracturing is regarded as sheet formability.A number of sheet materials are formed to fracture and the trends correlating formability with normalized radius(i.e.,R/To where R is the tool-radius and To is the sheet thickness)are *** trends confirm that there is a critical tool-radius(Rc)that maximizes the formability in ***,it is found that the critical radius is not fixed rather it shows dependence on the sheet thickness such that Rc=βTo,whereβvaries from 2.2 to 3.3 as the thickness increases from 1 mm to 3 *** critical radius,however,remains insensitive to variation in step size ranging from 0.3 mm to 0.7 *** is also observed that the selection of tool with Rbility window not only on the higher side but also on the lower *** higher limit,as revealed by the experimental and FEA results,diminishes due to excessive shearing because of in-plane biaxial compression,and the lower limit reduces due to pillowing in the bottom of *** new tool-radius condition proposed herein study would be helpful in maximizing the formability of materials in SPIF without performing experimental trials.

关键词： Incremental forming Critical tool-radius Formability curve Finite element analysis

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内部审计的发展

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审计研究 1986年第6期 42-49页

作者： l.b.索耶 ,黄义潮

内部审计发展历史古代时期内部审计在古代就有其根源。但只有到近代这棵大树才开始根深叶茂。现代内部审计的历史,从古至今经历了一个缓慢而艰苦的过程。直至1941年内部审计师协会的成立才真正算得上初露端倪,从那时起,一个独特的行... 详细信息

内部审计发展历史古代时期内部审计在古代就有其根源。但只有到近代这棵大树才开始根深叶茂。现代内部审计的历史,从古至今经历了一个缓慢而艰苦的过程。直至1941年内部审计师协会的成立才真正算得上初露端倪,从那时起,一个独特的行业开始蓬勃发展。

关键词：内部审计外部审计审计师公共会计师财务报表资产负债表资金平衡表银行对帐单非财务领域会计控制现金审计财务审计现金库存

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二十一世纪的行政法

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环球法律评论 2004年第2期26卷 165-177页

作者： l.b.斯图尔特苏苗罕纽约大学浙江大学公法与比较法研究所

本文主要讨论与行政管理相关的行政法。作者首先总结了上个世纪美国行政法的中心要素并揭示它们发展和转型的过程 ,然后论述了美国在面临不断增加的行政疲劳的情况下为实现管制目的而发展出来的新方法及其对行政法的意义 ,最后简要介绍... 详细信息

本文主要讨论与行政管理相关的行政法。作者首先总结了上个世纪美国行政法的中心要素并揭示它们发展和转型的过程 ,然后论述了美国在面临不断增加的行政疲劳的情况下为实现管制目的而发展出来的新方法及其对行政法的意义 ,最后简要介绍了新出现的行政法的国际性方面。

关键词：二十一世纪行政法行政管制美国共同管制政策

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Two Cyclic Peptides Produced by the Endophytic Fungus # 2221 from Castaniopsis fissa on the South China Sea Coast

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Chinese Chemical letters 2005年第2期16卷 219-222页

作者： WenQingYIN JieMingZOU ZhiGangSHE l.l.P.Vrijmoed E.b.GarethJones YongChenglIN DepartmentofA_ppliedChemistry ZhongshanUniversityGuangzhou510275 DepartmentofAppliedChemistry ZhongshanUniversityGuangzhou510275／／GuilinSanjinPharmaceuticalCo.Ltd.Guilin541004／／DepartmentofchemistryandchemicalengineeringGuangxiNormalUniversityGuilin5411004 GuilinSanjinPharmaceuticalCo.ltd. Guilin541004 DepartmentofbiologyandChemistry CityUniversityofHongKongHongKong

New cyclic peptides 1 and 2 were isolated from the endophytic fungus #2221 fromCastaniopsis fissa on the south China sea coast. by 2D NMR methods and chiral HPlC technique,their structures were elucidated as cyclo (l-... 详细信息

关键词： Endophytic fungus cyclic peptides metabolite.

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一种可渗透的陶瓷模具材料

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工业技术与职业教育 1980年第3期 69-72页

作者： l.b.科芬周龙

本文作者发明了一种可渗透的经煅烧而成的陶瓷模具材料,可用来代替石膏和石膏水泥。它是用硅酸乙酯作为粘合剂的陶瓷聚合体,用传统的陶瓷技术成形,然后干燥和煅烧。

关键词：成形水泥石膏硫酸钙硫酸盐矿物硅灰石矽灰石链状硅酸盐矿物陶瓷模具无水硼砂模具寿命螺钉紧固件挠曲强度

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Corrosion protection of AZ91D magnesium alloy by a cerium-mol.b.enum coating-The effect of citric acid as an additive

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Journal of Magnesium and Alloys 2018年第4期6卷 356-365页

作者： I.l.lehr S.b.Saidman Instituto de Ingeniería Electroquímica y Corrosión(INIEC) Departamento de Ingeniería QuímicaUniversidad Nacional del Sur(UNS)CONICETBahía BlancaArgentina

In order to improve the corrosion resistance of AZ91D magnesium alloy,a coating was formed by a potentiostatic technique from a solutions containing Ce(NO_(3))_(3),Na_(2)MoO_(4)and citric acid(H_(3)Cit).The degree of corrosion protection achieved was evaluated in simulated physiological solution by monitoring the open circuit potential,polarization techniques and electrochemical impedance spectroscopy(EIS).Surface analysis techniques(SEM,EDS,X-ray diffraction and X-ray photoelectron spectroscopy(XPS))were used for coating *** film is mainly composed by cerium and mol.b.enum oxides and magnesium oxides and *** obtained results show that the corrosion resistance of the coated electrodes has been increased *** improvement in the anticorrosive performance is in part due to the corrosion inhibition properties of H_(3)Cit.

关键词： Cerium and mol.b.enum-based coatings AZ91D alloy Citric acid Anticorrosive properties

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lichen species dominance and the resulting photosynthetic behavior of Sonoran Desert soil crust types(baja California,Mexico)

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Ecological Processes 2013年第1期2卷 64-72页

作者： burkhard büdel Mercedes Vivas Otto l lange Plant Ecology and Systematics Biology DepartmentUniversity of KaiserslauternP.O.Box 3049D-67653KaiserslauternGermany Department of Plant Science Faculty of PharmacyUniversidad Complutense de Madrid Plaza Ramóny Cajal28040MadridSpain Julius-von-Sachs-Institut für biowissenschaften University of WürzburgJulius-von-Sachs-Platz 3D-97082WürzburgGermany.

Introduction:lichen dominated biological soil crusts(bSCs)occur over large areas in the Sonoran Desert of the southwestern USA and northwest *** baja California bSCs show a distinct patchiness and several types can be *** chlorolichen-and two cyanolichen-dominated bSCs were *** hypothesize that patchiness and the resulting domination of certain functional lichen groups will result in patchiness of photosynthetic CO_(2)-uptake related to environmental factors as ***:Four different soil crust samples were placed in cuvettes and their CO_(2) exchange was recorded in an open system with an infrared gas *** blown over the bSCs had a controlled CO_(2) content of 350 *** cuvettes were operated in *** CO2 exchange was continually recorded throughout the ***:besides the dominating chlorolichens Psora decipiens and Placidium squamulosum and the cyanolichens Peltula patellata and ***,several other lichen species and 12 cyanobacterial species were found in the biological soil crusts *** chlorolichen bSCs already gained positive net photosynthesis with high air humidity alone,while the cyanolichen types did not,but showed smaller CO_(2)-uptake depression after water *** specific net photosynthesis responses to mode of hydration and to crust water content seem to correlate with precipitation characteristics of their ***:Species specific photosynthetic performance related to activation of respiration and net photosynthesis as well as to crust water content help to explain niche occupation and species composition of *** functional types have to be considered when they have a patchy distribution.

关键词： biological soil crust lichens Cyanobacteria Photosy

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GAbA UPTAKE bY GAT1 MODUlATES lONG-TERM OPTICAl CHANGES FOllOWING ElECTRICAl STIMUlATION OF THE PITUITARY GlAND NEUROINTERMEDIATE l.b.

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Journal of Innovative Optical Health Sciences 2013年第3期6卷 46-57页

作者： P.KOSTERIN A.l.ObAID b.M.SAl.b.RG Department of Neuroscience Perelman School of Medicine University of Pennsylvania Philadelphia PA 19104 Department of Physiology Perelman School of Medicine University of Pennsylvania Philadelphia PA 19104

Intrinsic optical changes that follow infundibular stalk stimulation of the neurointermediate l.b. of the mouse pituitary gland exhibit three different phases that reflect three distinct physiological *** first(E-wave)is the rapid light-scattering increase that is associated with a nerve terminal volume increase(mechanical spike),and that accompanies excitation of the neurohy-pophysial terminals by the invading action potential;the second(S-wave)is the slower light-scattering decrease that is tightly corelated with the secretion of the peptide hormones oxytocin and arginine vasopressin,and the third is the long duration response(R-wave)that reflects cell volume changes in the pars *** have studied the E-wave and the S-wave in earlier *** R-wave,considered here,is sensitive to chloride replacement as wel as to blockade of chloride *** blocking GAbAA reeptors(which are ligand gated chloride channels)with pharrmacological agents,and by applying GAbA directly into the bathing solution,or evoking its release from GAbAergic inputs,we have demonstrated that this long-duration optical response is sensitive to chloride movements and reflects GAbA-induced changes in the intrinsic optical propertis of the pars *** full time course of this optical response takes mimutes and,therefore,has to embody some other process(or processes)related to the restoration of resting physiological chloride concentrations,following the opening and closing of GAbA A-reeptor *** we demonstrate that the shape of the R wave,the longlasting light-scattering signal,is indeed affected by the activity of GAT1,one of the *** GA bA transporters.

关键词： light scattering posterior pituitary pars nervosa neurohypophysis volume changes pars intermedic GAbAA receptors

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Degradation patterns of silicone-based dielectric elastomers in electrical fields

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International Journal of Smart and Nano Materials 2018年第4期9卷 217-232,I0001页

作者： liyun Yu Frederikke b.Madsen Anne l.Skov Danish Polymer Centre Department of Chemical and Biochemical EngineeringTechnical University of DenmarkKgs.LyngbyDenmark

Silicone elastomers have been heavily investigated as candidates for the flexible insulator material in dielectric elastomer transducers and are as such almost ideal candidates because of their inherent softness and ***,silicone elastomers suffer from low dielectric *** shortcoming has been attempted optimized through different approaches during recent *** optimization with the sole purpose of increasing the dielectric permittivity may lead to the introduction of problematic phenomena such as premature electrical.b.eakdown due to high leakage currents of the thin elastomer *** this work,electrical.b.eakdown phenomena of various types of permittivity-enhanced silicone elastomers are *** showed that different types of polymer backbone chemistries lead to differences in electrical.b.eakdown patterns,which were revealed through SEM *** may pave the way towards a better understanding of electrical.b.eakdown mechanisms of dielectric elastomers and potentially lead to materials with increased electrical.b.eakdown strengths.

关键词： Silicone elastomers dielectric electrical.b.eakdown voltage stabilization characterization

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Existence of Nondecreasing and Continuous Solutions of an Integral Equation with linear Modification of the Argument

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Acta Mathematica Sinica,English Series 2007年第9期23卷 1719-1728页

作者： J.CAbAllERO b.lóPEZ K.SADARANGANI Departamento de Matemáticas Universidad de Las Palmas de Gran CanariaCampus de Tafira Baja35017 Las Palmas de Gran CanariaSpain

We use a technique associated with measures of noncompactness to prove the existence of nondecreasing solutions to an integral equation with linear modification of the argument in the space C[0, 1]. In the last thirty years there has been a great deal of work in the field of differential equations with a modified argument. A special class is represented by the differential equation with affine modification of the argument which can be delay differential equations or differential equations with linear modifications of the argument. In this case we study the following integral equation x（t） = a（t）＋（Tx）（t） ∫0^σ（t） u（t, s, x（s）, x（λs））ds 0 〈 λ 〈 1 which can be considered in connection with the following Cauchy problem x＇（t） = u（t, s, x（t）, x（λt））, t ∈ [0, 1], 0 〈 λ 〈 1 x（0） = u0.

关键词： measure of noncompactness fixed point theorem nondecreasing solutions

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