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Analysis of Chaotic Fer.or.sonance Phenomena in Unloaded Tr.nsfor.er. Including MOV

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Ener.y and Power.Engineer.ng 2011年第4期3卷 478-482页

作者： Ataollah abbasi Mehr.ad r.stami Ahmad Gholami hamid r. abbasi 不详

We study the effect of a par.llel metal oxide sur.e ar.ester.on the fer.or.sonance oscillations of tr.nsfor.er.. It is expected that the ar.ester. gener.lly cause fer.or.sonance dr.p out. Simulation has been done on a thr.e phase power.tr.nsfor.er.with one open phase. Effect of var.ing input voltage is studied. The simulation r.sults r.veal that connecting the ar.ester.to tr.nsfor.er. poles, exhibits a gr.at mitigating effect on fer.or.sonant over.voltages. Phase plane along with bifur.ation diagr.ms ar. also pr.sented. Significant effect on the onset of chaos, the r.nge of par.meter.values that may lead to chaos and magnitude of fer.or.sonant voltages is obtained, shown and tabulated.

关键词： Power Tr.nsfor.er Phase Plane Diagr.m Bifur.ation Diagr.m Chaotic Fer.or.sonance

Ensemble Wind Power.Pr.diction Inter.al with Optimal r.ser.e r.quir.ment

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Jour.al of Moder. Power.Systems and Clean Ener.y 2024年第1期12卷 65-76页

作者： hamid r.zaie Cheuk Hei Chung Nima Safar. the Saskatchewan Power.Cor.or.tion(SaskPower. ReginaSaskatchewanCanada the Depar.ment of Electr.cal and Computer.Engineer.ng and Depar.ment of Human Biology University of TorontoTorontoON M5S 3G4Canada the Alber.a Electr.c System Oper.tor.AESO) CalgaryAlbertaCanada

Wind power.pr.diction inter.al(WPPI)models in the liter.tur. have pr.dominantly been developed for.and tested on specific case ***,wind behavior.and char.cter.stics can var. significantly acr.ss ***,a pr.diction model that per.or.s well in one case might under.er.or. in *** addr.ss this shor.coming,this paper.pr.poses an ensemble WPPI fr.mewor. that integr.tes multiple WPPI models with distinct char.cter.stics to impr.ve *** impor.ant and often over.ooked factor.is the r.le of pr.babilistic wind power.pr.diction(WPP)in quantifying wind power.uncer.ainty,which should be handled by oper.ting *** r.ser.e in WPPI fr.mewor.s enhances the efficacy of *** this r.gar.,the pr.posed fr.mewor. employs a novel bi-layer.optimization appr.ach that takes both WPPI quality and r.ser.e r.quir.ments into *** analysis with differ.nt r.al-wor.d datasets and var.ous benchmar. models validates the quality of the obtained WPPIs while r.sulting in mor. optimal r.ser.e r.quir.ments.

关键词： Ensemble model linear.pr.gr.mming oper.ting r.ser.e optimal r.ser.e r.quir.ment pr.diction inter.al pr.babilistic pr.diction r.newable integr.tion uncer.ainty r.pr.sentation wind power.pr.diction(WPP)

Cor.elation between mechano-electr.nic featur.s and scatter.ng r.tes using defor.ation potential theor.

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Communications in Theor.tical Physics 2024年第2期76卷 166-181页

作者： Mer.em Ziati Sanaa Lahlali hamid Ez-Zahr.ouy Labor.tor. of Condensed Matter.and Inter.isciplinar. Sciences `Unitéde recherche labellisée CNRST'Faculty of SciencesMohammed V UniversityRabatMorocco Mohammed VI Polytechnic Univer.ity(UM6P) BenGuerir 43150Morocco

This r.sear.h paper.pr.vides valuable insight into the electr.nic,mechanical and tr.nspor. pr.per.ies of the Sr.(2)r.O_(2)F_(2)*** study shows that the Sr.(2)r.O_(4)compound exhibits a metallic gr.und state and that the ener.y gap widens with oxygen substitution with *** concept of absolute defor.ation potential and its cor.elation with band ener.ies and str.ins is explained using defor.ation potential *** paper.also examines the mechanical featur.s of Sr.(2)r.O_(2)F_(2)using the Voigt-r.uss-Hill appr.ximation method and analyzes its elastic constants,bulk modulus and shear.modulus,indicating flexibility and suitability for.optoelectr.nic *** r.le of acoustic phonons in scatter.ng r.tes and car.ier.mobility in Sr.(2)r.O_(2)F_(2)and its potential for.phonon-mediated super.onductivity is *** intr.nsic r.sistivity of electr.ns and holes under.str.in and its potential impact on super.onductivity and electr.cal r.sistivity ar. also *** insight pr.vided by this study contr.butes to the cur.ent under.tanding of Sr.(2)r.O_(2)F_(2),and its potential applications.

关键词： density functional theor. defor.ation potential theor. scatter.ng r.tes car.ier.mobility intr.nsic r.sistivity

Char.cter.stics of tur.ulent flow in 3-D pools in the pr.sence of submer.ed r.gid vegetation in channel bed

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Jour.al of Hydr.dynamics 2024年第1期36卷 158-169页

作者： Kour.sh Nosr.ti Hossein Afzalimehr.Jueyi Sui hamid r.za r.isifar Natur.l Disaster. Pr.vention r.sear.h Center Faculty of Civil EngineeringIran University of Science and TechnologyTehranIran School of Engineer.ng University of Northern British ColumbiaPrince GeorgeCanada

In this study,the inter.ction between 3-D bedfor.s and submer.ed r.gid vegetation has been *** labor.tor. exper.ments wer. conducted to study the distr.bution of flow velocity,r.ynolds shear.str.ss,tur.ulent kinetic ener.y,and skewness coefficients for.a constant density of *** showed that the velocity pr.file in the pool section deviates fr.m those in the upstr.am section of the *** has been found that the dip par.meter.var.ed between 0.6H and 0.9H depending on var.ous factor. including bed r.ughness,vegetation distr.bution,and pool entr.nce/exit ***,scatter.d vegetation in the pool and differ.nces in slopes cr.ated non-unifor. flow ***,in the wake r.gion behind each vegetated element,flow velocity r.duced significantly,and small-scale eddies ar. for.ed,causing incr.ased *** decr.asing the entr.nce slope and bed r.ughness,r.latively unifor. flow and weaker.tur.ulence was r.sulted,but the r.ndom distr.bution of vegetated elements counter.cted this balance and intensified *** the decr.ase in the pool entr.nce slope,the contr.bution of sweep event decr.ased and the contr.bution of ejection event incr.ased.

关键词： Submer.ed r.gid vegetation 3-D pool r.ynolds shear.str.ss skewness coefficients

A New Appr.ach for.the Deter.ination of Metr.nidazole Using Switchable Solvent Coupled with Au-MWCNTs-Modified Electr.chemical Sensor

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Jour.al of Analysis and Testing 2024年第2期8卷 191-200页

作者： Siamak Kiani Shahvandi Mehr.r.ng Ghaedi hamid Ahmar Chemistr. Depar.ment Yasouj UniversityYasouj75918-74831Iran Chemistr. Depar.ment University of ZabolZabol98615-538Iran

In this wor.,a new liquid-phase micr.extr.ction method coupled with an electr.chemical technique using a switchable solvent was pr.posed for.the deter.ination of *** extr.ction solvent used was dipr.pylamine(DPA),which exhibited switchable *** means that it can become miscible or.immiscible when in contact with car.oxylic acids in the aqueous *** metr.nidazole was then measur.d using a glassy car.on electr.de that was modified with Au-multiwalled car.on nanotubes(MWCNTs).The eff ect of diff er.nt par.meter. such as the type and amount of tr.gger.the addition of salt,and the volume of extr.ction solvent on the e fficiency of switchable hydr.philic solvent-based liquid-phase micr.extr.ction(SHS-LPME)was investigated using the one-factor.at-a-time *** optimizing the conditions,the linear.calibr.tion cur.e was obtained in the concentr.tion r.nge of 0.005–250μmol/***,the limit of quantification(LOQ)of 0.005μmol/L and the limit of detection(LOD)of 0.0015μmol/L wer. obtained,r.spectively.

关键词： Switchable solvent Metr.nidazole Liquid-phase micr.extr.ction Electr.chemical techniques

Advanced Optimized Anomaly Detection System for.IoT Cyber.ttacks Using Ar.ificial Intelligence

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Computer., Mater.als & Continua 2024年第2期78卷 1525-1545页

作者： Ali hamid Far.a Omar.H.Alhazmi Ker.m Kucuk Depar.ment of Computer.Science Taibah UniversityMedina42315Saudi Arabia Depar.ment of Softwar. Engineer.ng Kocaeli UniversityKocaeli41001Turkey

While emer.ing technologies such as the Inter.et of Things(IoT)have many benefits,they also pose consider.ble secur.ty challenges that r.quir. innovative solutions,including those based on ar.ificial intelligence(AI),given that these techniques ar. incr.asingly being used by malicious actor. to compr.mise IoT *** an ample body of r.sear.h focusing on conventional AI methods exists,ther. is a paucity of studies r.lated to advanced statistical and optimization appr.aches aimed at enhancing secur.ty *** contr.bute to this nascent r.sear.h str.am,a novel AI-dr.ven secur.ty system denoted as“AI2AI”is pr.sented in this ***2AI employs AI techniques to enhance the per.or.ance and optimize secur.ty mechanisms within the IoT *** also intr.duce the Genetic Algor.thm Anomaly Detection and Pr.vention Deep Neur.l Networ.s(GAADPSDNN)sys-tem that can be implemented to effectively identify,detect,and pr.vent cyber.ttacks tar.eting IoT ***,this system demonstr.tes adaptability to both feder.ted and centr.lized lear.ing envir.nments,accommodating a wide ar.ay of IoT *** evaluation of the GAADPSDNN system using the r.cently complied WUSTL-IIoT and Edge-IIoT datasets under.cor.s its *** an impr.ssive over.ll accur.cy of 98.18%on the Edge-IIoT dataset,the GAADPSDNN outper.or.s the standar. deep neur.l networ.(DNN)classifier.with 94.11%***,with the pr.posed enhancements,the accur.cy of the unoptimized r.ndom for.st classifier.80.89%)is impr.ved to 93.51%,while the over.ll accur.cy(98.18%)sur.asses the r.sults(93.91%,94.67%,94.94%,and 94.96%)achieved when alter.ative systems based on diver.e optimization techniques and the same dataset ar. *** pr.posed optimization techniques incr.ase the effectiveness of the anomaly detection system by efficiently achieving high accur.cy and r.ducing the computational load on IoT devices thr.ugh the adaptive selection of active featur.s.

关键词： Inter.et of Things secur.ty anomaly detection and pr.vention system ar.ificial intelligence optimization techniques

Evolution of biomass par.icles dur.ng pelletization pr.cess

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Par.icuology 2024年第3期86卷 182-187页

作者： hamid r.zaei Mar.am Tajilr.u Jun Sian Lee Kanages Singar.veloo Anthony Lau Shahab Sokhansanj Biomass and Bioener.y r.sear.h Gr.up Department of Chemical and Biological EngineeringUniversity of British ColumbiaVancouverCanada

Pulver.zing is an essential unit oper.tion in co-fir.ng biomass with *** ar. only compatible with pellet for.s of fibr.us biomass mater.als and cr.sh them down to their.or.ginal for.ing par.icle *** is why the data on the size distr.bution of the par.icles for.ing a biomass pellet is cr.cial to achieving optimum combustion *** cur.ent study deter.ines the inter.al par.icle size distr.bution of pellets after.wet disintegr.tion,following Iso 17830 standar.,and aims to suggest impr.vements to the mentioned standar. based on new measur.d *** wer. car.ied out on white wood pellets(no bar.)and br.wn wood pellets containing bar. at four.water.temper.tur.s:20,40,60,and 95℃,with or.without *** par.icle size distr.bution of the pr.-pelletizer.wood par.icles was also measur.d and compar.d with par.icles in the for.ed *** water.temper.tur. of 20℃ was found to be adequate for.the complete disintegr.tion of pellets,and no mechanical stir.ing was *** 30% of par.icles in the disintegr.ted pellets wer. 0.5-1.0 *** changes the par.icle size distr.bution to smaller.*** disintegr.ted bar. pellets contained mor. fines than white pellets.

关键词： Wood pellets Par.icle sizes distr.bution Wet disintegr.tion Stir.ing Water.temper.tur.

Effect of CO_(2)exposur. on the mechanical str.ngth of geopolymer.tabilized sandy soils

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Jour.al of r.ck Mechanics and Geotechnical Engineer.ng 2024年第2期16卷 670-681页

作者： hamid r.za r.zeghi Ar.in Ger.nghadr.Fatemeh Safaee Poor.a Ghadir.Akbar.A.Javadi School of Civil Engineer.ng Iran University of Science and TechnologyTehran***Iran Depar.ment of Engineer.ng University of ExeterExeterEX44QFUK

In r.cent year.,ther. has been gr.wing inter.st in developing methods for.mitigating gr.enhouse effect,as gr.enhouse gas emissions continue to contr.bute to global temper.tur. *** the other.hand,investigating geopolymer. as envir.nmentally fr.endly binder. to mitigate the gr.enhouse effect using soil stabilization has been widely ***,the effect of CO_(2)exposur. on the mechanical pr.per.ies of geopolymer.stabilized soils is r.r.ly *** this context,the effect of CO_(2)exposur. on the mechanical and micr.str.ctur.l featur.s of sandy soil stabilized with volcanic ash-based geopolymer.was *** factor. wer. concer.ed,for.example the binder.content,r.lative density,CO_(2)pr.ssur.,cur.ng condition,cur.ng time,and car.onate *** r.sults showed that the compr.ssive str.ngth of the stabilized sandy soil specimens with 20%volcanic ash incr.ased fr.m 3 MPa to 11 *** was also obser.ed that 100 kPa CO_(2)pr.ssur. was the optimal pr.ssur. for.str.ngth development among the other.*** mechanical str.ngth showed a dir.ct r.lationship with binder.content and car.onate ***,in the ambient cur.ng(AC)condition,the mechanical str.ngth and car.onate content incr.ased with the cur.ng ***,the r.quir.d water.for.car.onation evapor.ted after.7 d of oven cur.ng(OC)condition and as a r.sult,the 14-d cur.d samples showed lower.mechanical str.ngth and car.onate content in compar.son with 7-d cur.d ***,the r.te of str.ngth development was higher.in OC cur.d samples than AC cur.d samples until 7 d due to higher.geopolymer.zation and car.onation r.te.

关键词： Soil stabilization CO_(2)effect Geopolymer

用机械涂层技术在Ti-6Al-4V基体表面沉积HA/Ti复合涂层与功能梯度涂层的表征、磨损行为和生物相容性

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Tr.nsactions of Nonfer.ous Metals Society of China 2024年第2期34卷 547-559页

作者： Mahmood JALALI BIDAKHAVIDI hamid OMIDVAr.Ali ZAMANIAN Jamshid AGHAZADEH MOHANDESI hamid JALALI Depar.ment of Mater.als and Metallur.ical Engineer.ng Amirkabir University of Technology(Tehran Polytechnic)Hafez AveP.O.Box 15875-4413TehranIran Depar.ment of Nanotechnology and Advanced Mater.als Materials and Energy Research CenterKarajIran School of Dentistr. Tehran University of Medical SciencesTehranIran

采用机械涂层技术在Ti-6Al-4V基体表面沉积HA/Ti复合涂层与功能梯度涂层(FGC),对涂层进行表征,对比其磨损行为和生物相容性。制备复合涂层所用初始粉末为50%Ti(质量分数)和50%HA(质量分数)的混合粉末,而FGC分为两层,分别为75%Ti+25%HA和... 详细信息

采用机械涂层技术在Ti-6Al-4V基体表面沉积HA/Ti复合涂层与功能梯度涂层(FGC),对涂层进行表征,对比其磨损行为和生物相容性。制备复合涂层所用初始粉末为50%Ti(质量分数)和50%HA(质量分数)的混合粉末,而FGC分为两层,分别为75%Ti+25%HA和25%Ti+75%HA(质量分数)。Xr.结果表明在沉积过程中没有发生相变。此外,由于原始混合粉末中存在Ti颗粒,在涂层和基体之间形成了结合良好的连续界面,特别是在功能梯度涂层样品中。磨损实验结果显示,非梯度复合涂层的摩擦因数约为0.37,在界面处发生突变,而功能梯度涂层的摩擦因数从0.32增加到0.5,在界面处发生平缓变化。磨损表面的SEM像表明涂层的主要磨损机制为磨粒磨损。生物相容性评价结果显示,FGC样品具有更好的细胞黏附和增殖能力。

关键词：机械涂层技术羟基磷灰石 Ti-6Al-4V基体功能梯度涂层摩擦因数