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THIr. Or.Er.SHEAr.DEFOr.ATION MODEL FOr.LAMINATED SHELLS WITH FINITE r.TATIONS:FOr.ULATION AND CONSISTENT LINEAr.ZATION

Open Jour.al of Soil Science（土壤科学期刊） 2024年第5期 319页

作者： Elias Salameh Hakam Al-Alami Ibr.heem hamdan

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Acta Mechanica Sinica 2004年第5期20卷 484-498页

作者： Mohamed BALAH hamdan Naser.AL-GHAMEDY Depar.ment of Infor.ation and Computer.Science King Fahd University of Petroleum & MineralsDhahran 31261Saudi Arabia (Depar.ment of Civil Engineer.ng King Fahd University of Petroleum & MineralsDhahran 31261Saudi Arabia

The paper.pr.sents an appr.ach for.the for.ulation of gener.l laminated shells based on a thir. or.er.shear.defor.ation theor.. These shells under.o finite (unlimited in size) r.tations and lar.e over.ll motions but with small str.ins. A singular.ty-fr.e par.metr.zation of the r.tation field is adopted. The constitutive equations, der.ved with r.spect to laminate cur.ilinear.coor.inates, ar. applicable to shell elements with an ar.itr.r. number.of or.hotr.pic layer. and wher. the mater.al pr.ncipal axes can var. fr.m layer.to layer. A car.ful consider.tion of the consistent linear.zation pr.cedur. per.inent to the pr.posed par.metr.zation of finite r.tations leads to symmetr.c tangent stiffness matr.ces. The matr.x for.ulation adopted her. makes it possible to implement the pr.sent for.ulation within the fr.mewor. of the finite element method as a str.ightfor.ar. task.

关键词： laminated shells thir. or.er.shear.defor.ation theor. finite r.tations consistent linear.zation

Fundamental Issues in Networ.ed Contr.l Systems

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IEEE/CAA Jour.al of Automatica Sinica 2018年第5期5卷 902-922页

作者： Magdi S.Mahmoud a Mutaz M.hamdan the systems engineer.ng depar.ment king fahd university of petroleum and minerals

Abstr.ct--This paper.pr.vides a sur.ey on modeling and theor.es of networ.ed contr.l systems （NCS）. In the fir.t par., modeling of the differ.nt types of imper.ections that affect NCS is discussed. These imper.ections ar. quantization er.or., packet dr.pouts, var.able sampling/tr.nsmission inter.als, var.- able tr.nsmission delays, and communication constr.ints. Then follows in the second par. a pr.sentation of sever.l theor.es that have been applied for.contr.lling networ.ed systems. These theor.es include： input delay system appr.ach, Mar.ovian system appr.ach, switched system appr.ach, stochastic system appr.ach, impulsive system appr.ach, and pr.dictive contr.l appr.ach. In the last par., some advanced issues in NCS including decentr.l- ized and distr.buted NCS, cloud contr.l system, and co-design of NCS ar. r.viewed. Index Ter.s--Decentr.0}zed networ.ed contr.l systems （NCS）, distr.buted networ.ed contr.l systems, networ. constr.ints, net- wor.ed contr.l system, quantization, time delays.

关键词： Decentr.0}zed networ.ed contr.l systems(NCS) distr.buted networ.ed contr.l systems networ. constr.ints networ.ed contr.l system quantization time delays

Cr.ck Pr.pagation in Pipelines Under.Extr.me Conditions of Near.Neutr.l PH SCC

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Computer., Mater.als & Continua 2022年第12期73卷 5315-5329页

作者： Abdullah Alsit Mohammad Alkhedher.Hasan hamdan Mechanical Engineer.ng Depar.ment College of EngineeringAbu Dhabi UniversityAbu Dhabi59911United Arab Emirates

Str.ss Cor.osion Cr.cking(SCC)pr.cess thr.ugh which cr.cks occur.in a var.ety of susceptible mater.als is a r.sult of a combination of r.sidual or.applied str.sses and *** oil and gas field,bur.ed pipeline steels ar. made of low-alloy steels with a fer.itic-pear.itic str.ctur.,such as *** dilute solutions,these mater.als ar. pr.ne to SCC *** Near.neutr.l simulated soil solution(NS4)solution is established to imitate SCC conditions and subsequently became the industr. r.quir.ment for.cr.ck gr.wth exper.ments in the major.ty of *** str.inassisted active cr.ck pathways ar. consider.d while modelling SCC gr.wth as an oxide film r.ptur. and anodic dissolution ***’s been hypothesized that incr.asing the str.in concentr.tion can help with dissolution at the filmfr.e cr.ck *** r.sear.h focuses on estimating the SCC cr.ck gr.wth r.te under.var.ous envir.nmental conditions in oil and gas pipelines using finite element *** simulation is car.ied out using the J-integr.l theor. in the COMSOL Multiphysics *** ar. per.or.ed to model the cr.ck gr.wth r.te(CGr.using slip anodic dissolution(film r.ptur.)*** plastic str.in gr.dient is r.quir.d to compute the SCC CGr.da/dt).Because the plastic str.in located at cr.ck tip incr.ases pr.por.ionally to the cr.ck length as it pr.pagates,the CGr.incr.ases as the str.ss intensity factor.SIF)*** cr.ck gr.wth r.tes incr.ase when constant loads ar. applied and as the temper.tur. r.ses,and elevating the cathodic potential has a minimal influence on the pr.pagation r.te of cr.cks but r.ises the mater.al yield str.ngth and impar.s br.ttle behavior.to it.

关键词： Str.ss cor.osion cr.cking SCC oxide film r.ptur. and anodic dissolution cr.ck gr.wth r.te CGr J-integr.l str.ss intensity factor.SIF

Design of r.bust intelligent pr.tection technique for.lar.e-scale gr.d-connected wind far.

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Pr.tection and Contr.l of Moder. Power.Systems 2018年第1期3卷 179-191页

作者： Omar.Nour.ldeen I.hamdan Electr.cal Engineer.ng Depar.ment Faculty of EngineeringSouth Valley UniversityQena 83523Egypt

This paper.pr.sents a design of r.bust intelligent pr.tection technique using adaptive neur.-fuzzy infer.nce system(ANFIS)appr.ach to detect and classify the fault types dur.ng var.ous faults occur.ence in lar.e-scale gr.d-connected wind ***,it is designed to deter.ine the fault location and isolate the wind tur.ine gener.tor. located in the faulted zone dur.ng fault occur.ence and r.connect them after.fault *** studied wind far. has a total r.ting capacity of 120 MW,wher. it consists of 60 doubly fed induction gener.tor.DFIG)wind tur.ines each has a capacity of 2 ***,the wind far. gener.tor. ar. positioned in 6 r.ws,wher. each r.w consists of 10 *** impacts of fault type,fault location,fault dur.tion,cascaded faults,per.anent fault and exter.al gr.d fault on the behaviour. of the gener.ted active and r.active power.ar. ***,the impacts of inter.al and exter.al faults in cases of differ.nt tr.nsition r.sistances ar. *** simulation r.sults indicate that,the pr.posed ANFIS pr.tection technique has the ability to detect,classify and deter.ine the fault location,then isolate the faulted zones dur.ng fault occur.ence and r.connect them after.fault ***,the wind tur.ines gener.tor. which ar. located in un-faulted zones can stay to deliver.their.gener.ted active power.to the gr.d dur.ng fault per.od.

关键词： ANFIS Fault location DFIG Wind far. Active power r.active power

Syner.y of r.motely sensed data in spatiotempor.l dynamic modeling of the cr.p and cover.management factor

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Pedospher. 2022年第3期32卷 381-392页

作者： Pooja P.Pr.ETHA Ashr.f Z.AL-hamdan Depar.ment of Civil Engineer.ng Alabama A&M University4900 Meridian Street NHuntsvilleAL 35811-7500(USA) Depar.ment of Civil and Envir.nmental Engineer.ng University of Alabama in Huntsville301 Sparkman DriveHuntsvilleAL 35899-7500(USA)

Soil er.sion is a thr.at to the water.quality constituents of sediments and nutr.ents and can cause long-ter. envir.nmental *** impor.ant par.meter.to quantify the r.sk of soil loss fr.m er.sion is the cr.p and cover.management factor.C-factor.,which r.pr.sents how cr.pping and management pr.ctices affect the r.tes and potential r.sk of soil *** developed r.motely sensed data-dr.ven models for.dynamic pr.dictions of C-factor.by implementing dynamic land cover.modeling using the SWAT(Soil and Water.Assessment Tool)model on a water.hed *** r.motely sensed pr.cessed var.ables included the enhanced vegetation index(EVI),the fr.ction of photosynthetically active r.diation absor.ed by gr.en vegetation(FPAr.,leaf ar.a index(LAI),soil available water.content(AWC),slope gr.dient(SG),and r.tio of ar.a(Ar.of ever. hydr.logic r.sponse unit(Hr.)to that of the total water.hed,compr.sing unique land cover.soil type,and slope gr.dient char.cter.stics within the Fish r.ver.catchment in Alabama,USA between 2001 and *** r.gr.ssions,spatial tr.nd analysis,cor.elation matr.ces,for.ar. stepwise multivar.able r.gr.ssion(FSMr.,and 2-fold cr.ss-validation wer. conducted to evaluate whether.ther. wer. possible associations between the C-factor.and EVI with the successive addition of r.motely sensed envir.nmental *** on the data analysis and modeling,we found a significant association between the C-factor.and EVI with the syner.y of the envir.nmental factor. FPAr.LAI,AWC,Ar.and SG(pr.dicted r.(2)(r.(2)_(pr.d))=0.51;r.(2)=0.68,n=3220,Pr.sults showed that the developed FSMr.model constituting the non-conventional factor. AWC(r.(2)_(pr.d)=0.32;r.(2)=0.48,n=3220,Pr.r.(2)_(pr.d)=0.13;r.(2)=0.28,n=3220,P=0.31)was an impr.ved fit for.the water.hed *** conclusion,the union of dynamic var.ables r.lated to vegetation(EVI,FPAr.and LAI),soil(AWC),and topogr.phy(Ar.and SG)can be utilized for.spatiotempor.l C-factor.estimation and to mo

关键词： C-factor enhanced vegetation index land cover.modeling r.mote sensing soil er.sion soil moistur. solar.r.diation

Email Filter.ng Using Hybr.d Featur. Selection Model

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Computer.Modeling in Engineer.ng & Sciences 2022年第8期132卷 435-450页

作者： Adel hamdan Mohammad Sami Smadi Tar.q Alwada’n Computer.Science Depar.ment The World Islamic Sciences and Education UniversityAmmanJordan Infor.ation System and Networ.s Depar.ment The World Islamic Sciences and Education UniversityAmmanJordan Networ. and Cyber.ecur.ty Depar.ment Teesside UniversityMiddlesbroughUK

Undoubtedly,spam is a ser.ous pr.blem,and the number.of spam emails is incr.ased ***,the massive number.of spam emails pr.mpts the need for.spam detection *** methods and algor.thms ar. used for.spam ***,some emer.ent spam detection techniques use machine lear.ing methods and featur. *** methods and algor.thms have been intr.duced for.spam detecting and *** r.sear.h pr.poses two models for.spam detection and featur. *** fir.t model is evaluated with the email spam classification dataset,which is based on r.ducing the number.of keywor.s to its *** r.sults of this model ar. pr.mising and highly *** second pr.posed model is based on cr.ating featur.s for.spam detection as a fir.t ***,the number.of featur.s is r.duced using thr.e well-known metaheur.stic algor.thms at the second *** algor.thms used in the second model ar. Ar.ificial Bee Colony(ABC),Ant Colony Optimization(ACO),and Par.icle Swar. Optimization(PSO),and these thr.e algor.thms ar. adapted to fit the pr.posed ***,the author. give it the names AABC,AACO,and APSO,*** dataset used for.the evaluation of this model is ***,well-known cr.ter.a ar. used for.the evaluation pur.oses of this model,such as tr.e positive,false positive,false negative,pr.cision,r.call,and *** outcomes of the second pr.posed model ar. highly significant compar.d to the fir.t one.

关键词： Featur. selection ar.ificial bee colony ant colony optimization par.icle swar. optimization spam detection emails filter.ng

Analysis of par.iculate behavior.in por.us media

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Applied Mathematics and Mechanics(English Edition) 2008年第4期29卷 511-516页

作者： Hani I.Siyyam M.H.hamdan Depar.ment of Mathematics and Physics College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar Depar.ment of Mathematical Sciences University of New BrunswickP.O.Box 5050Saint JohnNew BrunswickCanada

In this wor., we analyze the behavior.of the par.icle phase in the flow of a par.icle-laden mixtur. thr.ugh a por.us medium. An attempt is made to model the diffusion and disper.ion pr.cesses, and to quantify the devi... 详细信息

关键词： por.us media dusty gases par.icle behavior

Fir.t-Line Dr.g r.sistance Patter.s of Mycobacter.um tuber.ulosis Complex Isolates fr.m r.-Tr.atment Patients fr.m Sudan

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Jour.al of Tuber.ulosis r.sear.h 2016年第3期4卷 98-104页

作者： Muatsim Ahmed Mohammed Adam hamdan Mustafa hamdan ali Eltahir.Awad Gasim Khalil National Tuber.ulosis r.fer.nce Labor.tor. National Public Health Laboratory Federal Ministry of Health Khartoum Sudan National Tuber.ulosis Contr.l Pr.gr.m Federal Ministry of Health Khartoum Sudan Tuber.ulosis r.sear.h Gr.up/Institute of Endemic Diseases University of Khartoum Khartoum Sudan

Dr.g susceptibility testing (DST) plays a pivotal r.le in TB patients’ management leading to the selection of most effective dr.gs. This study aimed to deter.ine r.sistance patter.s to fir.t line anti-TB dr.gs in Mycobacter.um tuber.ulosis isolates fr.m r.-tr.ated patients fr.m Sudan. A total of 239 sputum specimens wer. collected fr.m smear.positive r.-tr.atment TB patients dur.ng the per.od fr.m July 2009 to July 2010. Specimens wer. pr.-tr.ated accor.ing to Petr.ff method. The r.cover.d isolates wer. tested for.sensitivity to fir.t line anti-TB dr.gs by the 1% pr.por.ion method. One hundr.d and for.y thr.e (143/239, 59.8%) mycobacter.al isolates wer. successfully r.cover.d. The major.ty (98.6%, 141/143) of the isolates wer. Mycobacter.um tuber.ulosis complex str.ins. Two str.ins (2/143, 1.4%) wer. identified as r.F/INH-r.sistant MOTT, while fifty four.isolates (38.3%, 54/141) wer. MDr. Multi- dr.g r.sistant Mycobacter.um tuber.ulosis complex (MDr.TB) among r.-tr.atment patients fr.m national r.fer.al center. for.tuber.ulosis diagnosis and management was consider.bly high in the study isolates.

关键词： MDr Sudan TB r.-Tr.atment DST

r.sour.e Exhaustion Attack Detection Scheme for.WLAN Using Ar.ificial Neur.l Networ.

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Computer., Mater.als & Continua 2023年第3期74卷 5607-5623页

作者： Abdallah Elhigazi Abdallah Mosab hamdan Shukor.Abd r.zak Fuad A.Ghalib Muzaffar.Hamzah Suleman Khan Siddiq Ahmed Babikir.ali Mutaz H.H.Khair. Sayeed Salih Faculty of Engineer.ng Future UniversityKhartoum 10553Sudan Faculty of Computing and Infor.atics Universiti Malaysia SabahKota Kinabalu88400Malaysia Infor.ation Assur.nce and Secur.ty r.sear.h School of ComputingUniversiti Teknologi MalaysiaJohor81310Malaysia School of Psychology and Computer.Science University of Central LancashirePreston PR12HEUK Deaptement of Management Infor.ation Systems College of Administrative ScienceApplied Science UniversityAl Eker623Bahrain Deaptement of Infor.ation Technology College of Computer and Information SciencesKing Saud UniversityRiyadh11461Saudi Arabia

IEEE 802.11 Wi-Fi networ.s ar. pr.ne to many denial of ser.ice(DoS)attacks due to vulner.bilities at the media access contr.l(MAC)layer.of the 802.11 *** to the data tr.nsmission natur. of the wir.less local ar.a networ.(WLAN)thr.ugh r.dio waves,its communication is exposed to the possibility of being attacked by illegitimate ***,the secur.ty design of the wir.less str.ctur. is vulner.ble to ver.atile *** example,the attacker.can imitate genuine featur.s,r.nder.ng classificationbased methods inaccur.te in differ.ntiating between r.al and false *** secur.ty standar.s have been pr.posed over.the last decades to over.ome many wir.less networ. attacks,effectively detecting such attacks is cr.cial in today’s r.al-wor.d *** paper.pr.sents a novel r.sour.e exhaustion attack detection scheme(r.ADS)to detect r.sour.e exhaustion attacks *** pr.posed scheme can differ.ntiate between the genuine and fake management fr.mes in the ear.y stages of the attack such that access points can effectively mitigate the consequences of the *** scheme is built thr.ugh lear.ing fr.m cluster.d samples using ar.ificial neur.l networ.s to identify the genuine and r.gue r.sour.e exhaustion management fr.mes effectively and efficiently in *** pr.posed scheme consists of four.modules whichmake it capable to alleviates the attack impact mor. effectively than the r.lated *** exper.mental r.sults show the effectiveness of the pr.posed technique by gaining an 89.11%impr.vement compar.d to the existing wor.s in ter.s of detection.

关键词： 802.11 media access contr.l(MAC) wir.less local ar.a networ.(WLAN) ar.ificial neur.l networ. denial-of-ser.ice(DoS)