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Pareto optimization of WEdM process parameters for machining a NiTi shape memory alloy using a combined approach of RSM and heat transfer search algorithm

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Advances in Manufacturing 2021年第1期9卷 64-80页

作者： Rakesh Chaudhari jay J.Vora S.S.Mani Prabu I.A.Palani Vivek K.Patel d.M.Parikh department of Mechanical Engineering School of TechnologyPandit Deendayal Petroleum UniversityRaisanGandhinagar 382007India Metallurgy Engineering and Materials Science Indian Institute of Technology IndoreIndore 453552India discipline of Mechanical Engineering Indian Institute of Technology IndoreIndore 453552India department of Industrial Engineering School of TechnologyPandit Deendayal Petroleum UniversityRaisanGandhinagar 382007India

Machining of shape memory alloys(SMAs)without losing the shape memory effect could immensely extend their ***,the wire electric discharge machining process was used to machine NiTi—a shape memory *** experimental methodology was designed using a Box-Behnken design approach of the response surface *** effects of input variables including pulse on time,pulse off time,and current were investigated on the material removal rate,surface roughness,and *** tests were performed to check the robustness of the generated empirical *** of the process parameters was performed using a newly formulated,highly efficient heat transfer search *** tests were conducted and extended for analyzing the retention of the shape memory effect of the machined surface by differential scanning *** addition,2d and 3d Pareto curves were generated that indicated the trade-offs between the selected output variables during the simultaneous output variables using the multi-objective heat transfer search *** optimization route yielded encouraging *** objective optimization yielded a maximum material removal rate of 1.49 mm^(3)/s,maximum microhardness 462.52 HVN,and minimum surface roughness 0.11μ*** Pareto curves showed conflicting effects during the wire electric discharge machining of the shape memory alloy and presented a set of optimal non-dominant *** shape memory alloy machined using the optimized process parameters even indicated a shape memory effect similar to that of the starting base material.

关键词： Shape memory alloy(SMA) Nitinol Wire electrical discharge machining(WEdM) Heat transfer search algorithm differential scanning calorimetry(dSC)test Shape memory effect

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Numerical investigation of velocity ratio effect in combined wall and offset jet flows

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Journal of Hydrodynamics 2018年第6期30卷 1105-1119页

作者： Nidhal Hnaien Salwa Marzouk Habib Ben Aissia Jacques jay Unité de Métrologie et des systèmes énergétiques Ecole National d'ingénieurs de Monastir Tunisie Centre de Thermique de Lyon (CETHIL-UMR CNRS 5008) INSA de Lyon France

In the present work, we propose to numerically study a combined turbulent wall and offset jet flow(this combination will be denoted WOJ). Several turbulence models were tested in this study: the standard k-w, SST k-w, standard k-ε, RNG, and realizable k-ε model. A parametric study was performed to determine the effect of offset ratio H and the velocity ratio r on the longitudinal and transverse positions of the merge point(MP), the combined point(CP), the upper vortex center(UVC) and the lower vortex center(LVC). Correlations that predict the position of these characteristic points of the WOJ flow as a function of H and r have been provided. Results show that any increase in the velocity ratio causes a displacement of the MP, CP, UVC and LVC further upstream along the longitudinal direction. Concerning the transverse positions, the increase of velocity ratio results in a deviation of the merge point(MP) and the lower vortex center(LVC) toward the strong jet(LWJ) whereas the transverse position of combined point(CP) and the upper vortex center(UVC) is almost independent of the velocity ratio.

关键词： Finite volume combined point merge point offset jet velocity ratio

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What do Educators Need to Teach for Prospective Knowledge Engineers?

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Journal of Systems Engineering and Electronics 1995年第3期6卷 1-6页

作者： jay Liebowitz(dept. of Management Science, George Washington University, Washington, d. C. 20052) dept. of Management Science Georg Washington University Washington D. C. 20052

As expert systems technology has matured and migrated into mainstream computing, there arestill areas which are overlooked in education prospective knowledge engineers. This paper addresses this issue, and provides a message to educators that expert and knowledge-based systems should be an importantstrategic science and technology for many organizations.

关键词： Knowledge engineers Expert systems Intelligent systems Knowledge engineering

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The Use of the Past to Shape the Present:Shifting depictions of the Ancient World in Twentieth-Century American Cinema

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Fudan Journal of the Humanities and Social Sciences 2019年第1期12卷 61-78页

作者： Jacqueline E.jay History department Eastern Kentucky UniversityKeith 323521 Lancaster Ave.RichmondKY 40475USA

The ancient film epic has its roots at the very dawn of cinema as a form of popular art and entertainment,with a number of early silent films drawing their plots from ancient Biblical and Classical sources,and the genre remains relevant in the early twenty-first *** film epics thus provide a useful lens through which to trace evolutions in film history and in western culture more *** paper analyzes seven American films spanning the early twentieth century to the early twenty-first century(Intolerance,Quo Vadis,The Egyptian,The Ten Com?***,Gladiator,300),identifying specific ways each film mirrors or challenges the time period in which it was produced.

关键词： Film history Ancient history Ancient film epic Intolerance d.W.Griffith Quo Vadis The Egyptian The Ten Commandments Cecil B.deMille-Spartacus Stanley Kubrick Gladiator 300

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Simulation of mode conversion at the magnetopause

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Chinese Science Bulletin 2012年第12期57卷 1375-1383页

作者： LIN Yu JOHNSON jay WANG XueYi LU QuanMing Physics department Auburn University Auburn 36849 USA department of Geophysics and Planetary Science University of Science and Technology of China Hefei 230026 China princeton Plasma Physics Laboratory Princeton University Princeton 08543 USA

Two-dimensional(2-d)and three-dimensional(3-d)hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvn waves(KAWs)at the inhomogeneous magnetopause *** cases in which the incident fast wave propagates in the xz plane,with the magnetopause normal along x and the background magnetic field pointing along z,the 2-d (xz)simulation shows that KAWs with large wave number kxρi～1 are generated near the Alfve′n resonance surface,whereρi is the ion Larmor *** nonlinear wave properties are manifest in the mode conversion *** of the driver frequency are *** a result of nonlinear wave interaction,the mode conversion region and its spectral width are *** the 3-d simulation,after this first stage of the mode conversion to KAWs with large kx,a subsequent generation of KAW modes of finite ky is observed in the later stage,through a nonlinear parametric decay *** the nonlinear cascade to ky can lead to massive transport at the magnetopause,the simulation results provide an effective transport mechanism at the plasma boundaries in space as well as laboratory plasmas.

关键词：模拟模式磁层顶等离子体边界模式转换非线性波非线性参数波动力学混合模拟

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The effect of milling additives on powder properties and sintered body microstructure of NiO

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Journal of Advanced Ceramics 2015年第2期4卷 142-151页

作者： L.jay dEINER Michael A.ROTTMAYER Bryan C.EIGENBROdT department of Chemistry New York City College of TechnologyCity University of New York300 Jay St.BrooklynNY 11201USA The Air Force Research Labs Wright-Patterson Air Force BaseOH 45433USA department of Chemistry Villanova University800 E.Lancaster Ave.VillanovaPA 19085USA

The evolution of powder particle size,crystal structure,and surface chemistry was evaluated for micron scale NiO powders subjected to impact milling with commonly employed milling additives:methanol,Vertrel XF,and amorphous *** effect of the different comminution protocols on sintered body microstructure was evaluated for high temperature sintering in inert atmosphere(N_(2)).X-ray photoelectron spectroscopy showed that NiO powder surface chemistry is surprisingly sensitive to milling additive *** particular,the proportion of powder surface defect sites varied with additive,and methanol left an alcohol or alkoxy residue even after *** sintering to intermediate temperatures(1100℃),scanning electron microscopy(SEM)showed that slurry milled NiO powders exhibit hindered sintering *** effect was amplified for NiO milled with methanol,in which sub-500 nm grain sizes dominated even after sintering to 1100℃.Upon heating to high temperatures(1500℃),simultaneous differential scanning calorimetry/thermogravimetric analysis(dSC/TGA)showed that the powders containing carbon residues undergo carbothermal reduction,resulting in a melting transition between 1425 and 1454℃.Taken together,the results demonstrated that when processing metal oxide powders for advanced ceramics,the choice of milling additive is crucial as it exerts significant control over sintered body microstructure.

关键词： nickel oxide impact milling sintering densification grain growth

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The effects of habitat fragmentation on the reproduction and abundance of Angadenia berteroi

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Journal of Plant Ecology 2017年第2期10卷 340-348页

作者： Beyte Barrios Roque Suzanne Koptur jay P.Sah Plant Ecology Lab Department of Biological SciencesFlorida International University11200 SW 8th StMiamiFL 33199USA South Florida Terrestrial Ecosystems Lab Southeast Environmental Research CenterFlorida International University11200 SW 8th STMiamiFL 33199USA

Aims The pine rocklands of southern Florida are a fire-dependent forest associated with outcrops of *** rockland plants have sev-eral adaptations to fire,and for many species,burning increases plant growth,flowering and seedling *** pine rockland forest has been reduced and fragmented in recent *** of Everglades National Park,only 2%of the original pine rocklands remain,and they are in the form of small *** objective is to investigate the effects of fragmentation and habitat quality on abun-dance and plant reproductive fitness of Angadenia berteroi(A.d.C.)Miers,a threatened species of the southern Florida pine *** We estimated the density of plants using a stratified random sam-pling design,and reproductive fitness(in terms of percentage of plants with flowers and fruit)by walking transects in an array of habitat fragments of different sizes and degrees of isolation(distance to the nearest fragment)as well as in continuous *** equation modeling(SEM)was employed to investigate how *** reproductive fitness was affected by fragmentation and habitat *** Findings Habitat fragment size was correlated with the density of ***,but did not have a great impact on its reproductive ***,habitat quality represented by litter depth and subcan-opy cover had strong negative effects on the reproductive fitness of ***,suggesting that increased light availability and low litter cover resulting from recent fires may favor reproduction.

关键词： habitat fragmentation habitat quality isolation fire structural equation modeling reproductive fitness abundance

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Exploring the Current Practices,Costs and Benefits of FAIR Implementation in Pharmaceutical Research and development:A Qualitative Interview Study

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data Intelligence 2021年第4期3卷 507-527页

作者： Ebtisam Alharbi Rigina Skeva Nick Juty Caroline jay Carole Goble School of Computer Science University of ManchesterManchesterManchester M139PLUK College of Computer and Information Systems Umm Al-Qura UniversityMeccaMakkah 21421Saudi Arabia

The findable,accessible,interoperable,reusable(FAIR)principles for scientific data management and stewardship aim to facilitate data reuse at scale by both humans and *** and development(R&d)in the pharmaceutical industry is becoming increasingly data driven,but managing its data assets according to FAIR principles remains costly and *** date,little scientific evidence exists about how FAIR is currently implemented in practice,what its associated costs and benefits are,and how decisions are made about the retrospective FAIRification of data sets in pharmaceutical R&*** paper reports the results of semi-structured interviews with 14 pharmaceutical professionals who participate in various stages of drug R&d in seven pharmaceutical *** thematic analysis identified three primary themes of the benefits and costs of FAIRification,and the elements that influence the decision-making process for FAIRifying legacy data *** collectively acknowledged the potential contribution of FAIRification to data reusability in diverse research domains and the subsequent potential for *** costs,however,were still considered a barrier by participants,with the need for considerable expenditure in terms of resources,and cultural *** decisions were made about FAIRification was influenced by legal and ethical considerations,management commitment,and data *** findings have significant implications for those in the pharmaceutical R&d industry who are engaged in driving FAIR implementation,and for external parties who seek to better understand existing practices and challenges.

关键词： FAIR FAIRification Retrospective FAIRification Pharmaceutical R&d Cost-benefit decision-making process

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Thickness Effect of Nanocrystalline Layer on the deformation Mechanism of Amorphous/Crystalline Multilayered Structure

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Computer Modeling in Engineering & Sciences 2019年第8期120卷 293-304页

作者： Wen-jay Lee Yu-Chien Lo Anchen Yang Kuanpeng Chen Nan-Yow Chen National Center for High-Performance Computing No.22Keyuan Rd.Central Taiwan Science ParkTaichung City 40763Taiwan department of Materials Science and Engineering National Chiao Tung UniversityNo.1001 University Rd.Hsinchu 30010Taiwan National Center for High-Performance Computing No.7R&D 6th Rd.Hsinchu Science ParkHsinchu City 30076Taiwan

different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength and ductility of the composite *** this work,molecular dynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties and deformation behavior of the Cu64Zr36/Cu multi-layer *** stress-strain relationship,local stress,local strain,and deformation mechanism are *** results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties and deformation *** the strain at the elastic region,the amorphous Cu64Zr36 layer dominates the mechanical behavior,leading the fact that Young’s modulus,first yielding stress,and first yielding strain are close to that of Cu64Zr36 *** the strain at the plastic region,the contribution of the crystalline layer on the mechanical behavior becomes more and more significant with increasing the thickness of the crystalline *** the thickness ratio(amorphous/crystalline)of 4,the shear band deformation of amorphous layer dominates the mechanical *** the thickness ratio is 1,the glide dislocation of the crystalline layer dominates the stress-strain behavior.

关键词： Molecular dynamics Cu64Zr36 bulk metallic glass Cu64Zr36/Cu layered structure shear band mechanical property deformation

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多样性熊蜂物种中再现两种特定肠道微生物生态型

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科学新闻 2016年第1期 108-108页

作者：李继莲 J.Elijah Powell Jun Guo jay d.Evans Jie Wu Paul Williams Qinhui Lin Nancy A.Moran 张志刚中国农科院蜜蜂研究所中国科学院昆明动物研究所遗传资源与进化国家重点实验室进化与功能基因组学科组

文章简介熊蜂是一类具有丰富物种和生态多样性的重要传粉昆虫,而传粉昆虫是开花植物繁殖和进化的关键,对于人类粮食生产的可持续发展具有重要意义。已有的研究表明,肠道微生物多样性的变化,从营养代谢以及疾病免疫等多方面影响着传粉昆... 详细信息

文章简介熊蜂是一类具有丰富物种和生态多样性的重要传粉昆虫,而传粉昆虫是开花植物繁殖和进化的关键,对于人类粮食生产的可持续发展具有重要意义。已有的研究表明,肠道微生物多样性的变化,从营养代谢以及疾病免疫等多方面影响着传粉昆虫的健康状况和种群演化。通过对我国28种熊蜂的肠道细菌16s的V6-V8区采用高通量测序,并结合经典生态学的分析方法进行研究,结果表明,熊蜂肠道微生物存在两种保守的生态

关键词：肠道微生物熊蜂生态型物种

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