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Experimental Study on h.at Storage Properties Comparison of Paraffin/Metal Foams Ph.se Ch.nge Material Composites

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Journal of Th.rmal Science 2024年第2期33卷 469-478页

作者： Waqar Ah.ED Abid h.SSAIN h.nzla Sh.h.D Imran ali h.fiz Muh.mmad ali Department of Mech.nical Engineering University of Engineering and TechnologyTaxila47080Pakistan Department of Mech.nical Engineering Institute of Space TechnologyIslamabadPakistan Department of Mech.nical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan Mech.nical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research.Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

h.at storage properties of ph.se ch.nge materials(PCMs) are essential ch.racteristics th.t perform a key role in th.rmal h.at energy storage *** th.rmal properties of PCMs can be improved by developing metal foam/PCM *** addition of metal foam in PCMs h.s a significant effect on th. th.rmal ch.racteristics of *** th.s paper,th. h.at storage properties of two different metal foam/PCM composites were experimentally *** beh.vior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant h.at flux of 1000 W/m^(2) in th.ee directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials wh.ch.resulted in enh.ncing th. th.rmal conductivity of th. paraffin.A comparative analysis is made on th. h.at storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during th. ph.se transition process is experimentally *** comparison indicates th.t temperature uniformity in copper foam/paraffin composite is better th.n in iron-nickel foam/paraffin composite and pure paraffin at th. same h.at *** results sh.w th.t at h.at flux of 1000 W/m^(2),th. h.at storage time for copper foam/paraffin composite is 20.63% of th.t of iron-nickel foam/paraffin composite.

关键词： h.at storage capacity paraffin/metal foam composite temperature uniformity h.at storage rate ph.se transition process

Effect of cold-working on corrosion induced damage in lug joints

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Defence Tech.ology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath.M.N Ch.kmath.L. Murth. h. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finish.s and rubbing displacement between th. pin and *** causes damage of different sizes and sh.pes near th. *** degradation due to corrosion-induced damage is modelled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended performance of th. lug joint during th. damages due to corrosion are brough. out and compared with.non-cold-worked *** analysis is performed on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. meth.dology can be extended to damage growth.and analyse th. effect of surface treatments for better structural integrity of components of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

Emerging Trends in Damage Tolerance Assessment:A Review of Smart Materials and Self-Repairable Structures

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Structural Durability & h.alth.Monitoring 2024年第1期18卷 1-18页

作者： ali Akbar Firoozi ali Asgh.r Firoozi Department of Civil Engineering Faculty of Engineering&TechnologyUniversity of BotswanaGaboroneUB0061Botswana Department of Civil Engineering University Kebangsaan Malaysia(UKM)Bangi43600Malaysia

Th. discipline of damage tolerance assessment h.s experienced significant advancements due to th. emergence of smart materials and self-repairable *** review offers a compreh.nsive look into both.traditional and innovative meth.dologies employed in damage tolerance *** a detailed exploration of damage tolerance concepts and th.ir h.storical progression,th. review juxtaposes th. proven tech.iques of damage assessment with.th. cutting-edge innovations brough. about by smart materials and self-repairable *** subsequent sections delve into th. synergistic integration of smart materials with.self-repairable structures,marking a pivotal stride in damage tolerance by establish.ng an autonomous system for immediate damage identification and *** h.listic approach.broadens th. applicability of th.se tech.ologies across diverse sectors yet brings forth.unique ch.llenges demanding furth.r innovation and ***,th. review examines future prospects th.t combine advanced manufacturing processes with.data-centric meth.dologies,amplifying th. capabilities of th.se‘intelligent’*** review culminates by h.gh.igh.ing th. transformative potential of th.s union between smart materials and self-repairable structures,promoting a sustainable and efficient engineering paradigm.

关键词： Damage tolerance smart materials self-repairable structures structural h.alth.monitoring synergy autonomous system advanced manufacturing data-driven meth.dologies

A meth.dology for damage evaluation of underground tunnels subjected to static loading using numerical modeling

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Journal of Rock Mech.nics and Geotech.ical Engineering 2024年第6期16卷 1993-2005页

作者： Sh.h.iyar h.idarzadeh.ali Saeidi Rock Mech.nics Engineer AtkinsRéalisMontrealQuebecCanada Department of Applied Sciences Universitédu QuébecàChicoutimiChicoutimiQuebecCanada

We h.ve proposed a meth.dology to assess th. robustness of underground tunnels against potential *** involves developing vulnerability functions for various qualities of rock mass and static loading *** account for th.se variations,we utilized a Monte Carlo Simulation(MCS)tech.ique coupled with.th. finite difference code FLAC^(3D),to conduct two th.usand seven h.ndred numerical simulations of a h.rsesh.e tunnel located with.n a rock mass with.different geological strength.index system(GSIs)and subjected to different states of static *** quantify th. severity of damage with.n th. rock mass,we selected one stress-based(brittle sh.ar ratio(BSR))and one strain-based failure criterion(plastic damage index(PDI)).Based on th.se criteria,we th.n developed fragility ***,we used math.matical approximation tech.iques to produce vulnerability functions th.t relate th. probabilities of various damage states to loading intensities for different quality classes of blocky rock *** results indicated th.t th. fragility curves we obtained could accurately depict th. evolution of th. inner and outer sh.ll damage around th. ***,we h.ve provided engineers with.a tool th.t can predict levels of damages associated with.different failure mech.nisms based on variations in rock mass quality and in situ stress *** meth.d is a numerically developed,multi-variate approach.th.t can aid engineers in making informed decisions about th. robustness of underground tunnels.

关键词： Fragility curves Underground tunnels Vulnerability functions Brittle damage FLAC3D Numerical modeling

Using neural network modeling to improve th. detection accuracy of land subsidence due to groundwater with.rawal

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Journal of Mountain Science 2024年第7期21卷 2320-2333页

作者： ali M.RAJABI ali EDALAT Yasaman ABOLGh.SEMI Mah.i Kh.DAPARAST Department of Engineering Geology University of TehranTehran ***Iran Department of Civil Engineering University of QomQom ***Iran

Despite th. h.gh.efficiency of remote sensing meth.ds for rapid and large-scale detection of subsidence ph.nomena,th.s tech.ique h.s limitations such.as atmosph.ric impact and temporal and spatial decorrelation th.t affect th. accuracy of th. *** paper proposes a meth.d based on an artificial neural network to improve th. results of monitoring land subsidence due to groundwater overexploitation by radar interferometry in th. aliabad plain(Central Iran).In th.s regard,vertical ground deformations were monitored over 18 month. using th. Sentinel-1A SAR *** model th. land subsidence by a multilayer perceptron(MLP)artificial neural network,four parameters,including groundwater level,alluvial th.ckness,elastic modulus,and transmissivity h.ve been *** model's generalizability was assessed using data derived for 144 *** to th. results,th. neural network estimates th. land subsidence at each.ground point with.an accuracy of 6.8 mm.A comparison between th. predicted and actual values indicated a significant *** MLP model can be used to improve th. results of subsidence detection in th. study area or oth.r areas with.similar ch.racteristics.

关键词： DInSAR Land subsidence Groundwater with.rawal aliabad plain Artificial neural network

Integrated ph.tonic fractional convolution accelerator

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Ph.tonics Research 2024年第8期12卷 1828-1839页

作者： KEVIN ZELAYA MOh.MMED-ali MIRI Department of Ph.sics Queens College of the City University of New YorkQueensNew York 11367USA Ph.sics Program The Graduate Center of the City University of New YorkNew YorkNew York 10016USA

An integrated ph.tonic circuit arch.tecture to perform a modified-convolution operation based on th. discrete fractional Fourier transform(DFrFT) is introduced. Th.s is accomplish.d by utilizing two nonuniformly coupled waveguide lattices with.equally spaced eigenmode spectra, th. length. of wh.ch.are ch.sen so th.t th. DFrFT and its inverse operations are ach.eved. A programmable modulator array is interlaced so th.t th. required fractional convolution operation is performed. Numerical simulations demonstrate th.t th. proposed arch.tecture can effectively perform smooth.ng and edge detection tasks even for noisy input signals, wh.ch.is furth.r verified by electromagnetic wave simulations. Notably, mild lattice defects do not jeopardize th. arch.tecture performance, sh.wing its resilience to manufacturing errors.

关键词： fractional convolution utilizing

Performance of Text-Independent Automatic Speaker Recognition on a Multicore System

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Tsingh.a Science and Tech.ology 2024年第2期29卷 447-456页

作者： Rand Kouatly Talh. ali Kh.n Faculty of Tech.and Software Engineering University of Europe for Applied SciencesPotsdam 14469Germany

Th.s paper studies a h.gh.speed text-independent Automatic Speaker Recognition(ASR)algorith. based on a multicore system's Gaussian Mixture Model(GMM).Th. h.gh.speech.is ach.eved using parallel implementation of th. feature's extraction and aggregation meth.ds during training and testing *** memory parallel programming tech.iques using both.OpenMP and PTh.eads libraries are developed to accelerate th. code and improve th. performance of th. ASR *** experimental results sh.w speed-up improvements of around 3.2 on a personal laptop with.Intel i5-6300h.(2.3 Gh.,four cores with.ut h.per-th.eading,and 8 GB of RAM).In addition,a remarkable 100%speaker recognition accuracy is ach.eved.

关键词： Automatic Speaker Recognition(ASR) Gaussian Mixture Model(GMM) sh.red memory parallel programming PTh.eads OpenMP

CFD simulation and optimization of an industrial cement gas-solid air classifier

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Particuology 2024年第6期89卷 172-184页

作者： Moh.madreza Esmaeilpour ali Moh.bbi Vah.b Gh.landari Department of Ch.mical Engineering Faculty of EngineeringShahid Bahonar University of KermanKermanIran Kerman Momtazan Cement Company KermanIran

An air classifier is one of th. main and effective devices in cement *** th.s study,a th.ee-dimensional,steady and two-ph.se(solid-gas)computational fluid dynamics(CFD)simulation was performed to optimize th. performance of th.s device in th. Kerman Momtazan cement plant,*** th. validation of CFD results,th. air flow field and air path.lines between fixed blades were ch.cked carefully and th. non-uniformity in velocity distribution and th. formation of vortex flows between th. blades close to particle inlets were *** study tried to improve th. device efficiency by ch.nging th. meth.d of entering particles into th. device,resulting in a reduction in air classifier electrical energy consumption(from 41 to 35(kW h./t)and an increase in production rate(from 203 to 214 t/h..Additionally,th. study investigated th. effects of oth.r modifiable operating conditions like rotary cage rotation speed,pressure difference,and inlet air temperature on th. particle size distribution and classifier *** results sh.wed th.t increasing th. cage rotation speed decreased th. product rate and th. product particles mean diameter wh.le increasing pressure difference or increasing temperature increased th. product rate and th. product particles mean *** was concluded th.t th.se modifiable operating conditions can significantly affect th. performance of th. air classifier in th. cement industry.

关键词： Cement air classifier Computational fluid dynamics Gas-solid two-ph.se flow Optimization Eulerian-Lagrangian meth.d Efficiency

Sustainable path.ays to ammonia:a compreh.nsive review of green production approach.s

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Clean Energy 2024年第2期8卷 60-72页

作者： h.fiz Sh.rjeel Ah.ed Zaid Yah.a Waqar ali kh.n ali Faraz University of Engineering and Tech.ology(UET) LahorePakistan Ch.mical Engineering Department NFC Institute of Engineering and Fertilizer ResearchFaislabadPakistan Ch.mical Engineering Department Punjab UniversityLahorePakistan

Ammonia production is vital in global industries but faces increasing environmental concerns,necessitating a sh.ft towards sustainable *** review compreh.nsively explores diverse h.drogen production approach.s and th.ir potential impact on sustainable ammonia *** primary focus is investigating h.drogen production meth.ds th.t enh.nce both.efficiency and sustainability in ammonia synth.sis,wh.ch.is crucial for reducing its environmental ***,th. review h.gh.igh.s th. pivotal role of catalysts in improving Faradaic efficiency in ammonia synth.sis,emph.sizing th.ir significance in overall process *** study identifies innovative tech.ologies th.t h.ve th. potential to revolutionize ammonia production wh.le aligning with.global sustainability *** a th.rough.examination of h.drogen production meth.ds and catalytic advances,th.s review provides valuable insigh. into greener and more efficient ammonia production *** conclusion,it emph.sizes th. importance of exploring h.drogen production meth.ds and leveraging catalysts to improve ammonia production sustainability and *** addresses a critical research.gap and paves th. way for an environmentally responsible and globally aligned ammonia production industry.

关键词： ammonia production green alternatives sustainability catalyst