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Syn.hesis an. Characterisation.of Cr(III) an. Co(II) Schiff Base Complexes

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Materials Scien.es an. Application. 2023年第2期14卷 53-62页

作者： Fatin.M. Elmagbari ahmed n. hammouda Hamdi A. M. Ben.our Rashd M. EL-Ferjan. Youn.s O. Ben.Amer Departmen. of Chemistry Faculty of Science University of Benghazi Qar-Yunis Benghazi Libya

Co(II) an. Cr(III) metal complexes of Schiff bases were syn.hesized from the con.en.ation.reaction.between.4-(dimethylamin.)ben.aldehyde an. 4-amin.-3-hydroxy-n.phthalen.-1-sulfon.c acid. Their structures were in.estigated by elemen.al an.lysis, molar con.uctan.e measuremen.s, in.rared spectroscopy, electron.c spectroscopy, an. 1Hn.R spectroscopy. The elemen.al an.lysis data suggested a 1:1 [M:L] ratio for the complexes. The molar con.uctan.e measuremen.s of the complexes in.icate their electrolytic n.ture in.DMSO as a solven.. The absorption.ban.s in.the electron.c spectra verified an.octahedral en.iron.en. aroun. the metal ion. in.the complexes.

关键词： Schiff Base Ligan. Complexes 1Hn.R Spectra

In.ESTIGATIOn.OF DOMIn.n. FREQUEn.IES In.TRAn.ITIOn.REYn.LDS n.MBER RAn.E OF FLOW AROUn. A CIRCULAR CYLIn.ER PART I:EXPERIMEn.AL STUDY OF THE RELATIOn.BETWEEn.VORTEX SHEDDIn. An. TRAn.ITIOn.FREQUEn.IES

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Chin.se Journ.l of Mechan.cal En.in.erin. 2006年第3期19卷 159-167页

作者： ahmed n.A School of Mechan.cal an. Man.facturin. En.in.erin. Un.versity of n.w South Wales Sydney 2052 Australia

A comprehen.ive hot wire in.estigation.of the flow aroun. a circular cylin.er is carried out in.an.18＂ × 18＂ win. tun.el to look in.o the domin.n. frequen.ies at the stagn.tion. separation.an. separated shear layers in.the tran.ition.Reyn.lds n.mber ran.e. The majority of the experimen.s are carried out at Reyn.lds n.mber of 4.5×104, with addition.l tran.ition.frequen.y tests at Reyn.lds n.mbers of 2.9×104, 3.3×104 an. 9.7×104 respectively. The results are an.lysed in.terms of power spectral den.ity. While the frequen.y associated with stagn.tion.is foun. to be essen.ially due to vortex sheddin., frequen.y doublin. of vortex sheddin. is also eviden. in.the separated shear layers. Two peaks associated with tran.ition.frequen.ies are detected an. their possible implication. are presen.ed.

关键词： Vortex sheddin. Tran.ition Separated flow Power spectral den.ity

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EDSUCh:A robust en.emble data summarization.method for effective medical diagn.sis

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Digital Commun.cation. an. n.tworks 2024年第1期10卷 182-189页

作者： Mohiuddin.ahmed A.n.M.Bazlur Rashid School of Scien.e Edith Cowan UniversityPerthAustralia

Iden.ifyin. rare pattern. for medical diagn.sis is a challen.in. task due to heterogen.ity an. the volume of *** summarization.can.create a con.ise version.of the origin.l data that can.be used for effective *** this paper,we propose an.en.emble summarization.method that combin.s clusterin. an. samplin. to create a summary of the origin.l data to en.ure the in.lusion.of rare *** the best of our kn.wledge,there has been.n. such techn.que available to augmen. the performan.e of an.maly detection.techn.ques an. simultan.ously in.rease the efficien.y of medical *** performan.e of popular an.maly detection.algorithms in.reases sign.fican.ly in.terms of accuracy an. computation.l complexity when.the summaries are ***,the medical diagn.sis becomes more effective,an. our experimen.al results reflect that the combin.tion.of the proposed summarization.scheme an. all un.erlyin. algorithms used in.this paper outperforms the most popular an.maly detection.techn.ques.

关键词： Data summarization En.emble Medical diagn.sis Samplin.

Effect of in.oluble materials on.the volumetric behavior of rock salt

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Journ.l of Rock Mechan.cs an. Geotechn.cal En.in.erin. 2021年第1期13卷 84-97页

作者： Mejda Azabou ahmed Rouabhi Laura Blan.o-Martìn MIn.S ParisTech PSL Research UniversityCentre de Géosciences35 rue St HonoréFontainebleau77300France

This paper focuses on.the presen.e of n.dules of in.oluble materials within.salt specimen.,an. their effect on.the volumetric strain.measuremen.s an. the dilatan.y *** an.lyzed experimen.al results of over 120 con.en.ion.l triaxial compression.tests,an. foun. that in.20%of the cases,the volumetric strain.measuremen.s were *** also n.ted that the n.tural variability of the specimen. can.lead to a n.n.n.gligible data scatterin. in.the volumetric strain.measuremen.s when.differen. specimen. are subjected to the same *** is expected given.the small magn.tude of those strain.,but it occasion.lly implies that the correspon.in. specimen. are n.t represen.ative of the volumetric behavior of the studied *** order to un.erstan. these results,we n.merically in.estigated salt specimen. modeled as halite matrices with in.lusion. of *** of triaxial compression.tests on.these structures proved that such heterogen.ities can.in.uce dilatan.y,an. their presen.e can.lead to the appearan.e of ten.ile zon.s which is physically tran.lated in.o a micro-crackin. *** modelin. approach is validated as the pattern. displayed in.the n.merical results are iden.ical to that in.the *** was then.employed to explain.the observed irregularities in.experimen.al *** studied the n.tural variability effect as well an. proposed a methodology to overcome the issue of specimen.represen.ativity from both deviatoric an. volumetric perspectives.

关键词： Rock salt Dilatan.y Material heterogen.ity n.tural variability Triaxial tests Virtual laboratory

An.ibiotic Susceptibility Pattern. of Isolated Bacteria from Otitis Media in.Children.at Mohamed Aden.Sheikh Children.Teachin. Hospital in.Hargeisa, Somalilan.

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Journ.l of Bioscien.es an. Medicin.s 2023年第6期11卷 57-70页

作者： Saed n. ahmed Departmen.s of Health Services an. Public Health Ministry of Health Development Hargeisa Somaliland

Backgroun.: Otitis media (OM) is a group of in.lammatory diseases of the middle ear. OM is a prevailin. problem amon. children.in.Hargeisa. The an.ibiotic susceptibility of etiologic bacteria is n.t in.estigated in.Somalilan. which hin.ers the effective treatmen. of OM cases in.children. Objective: This study aimed at determin.n. the etiologic bacteria an. its an.ibiotic susceptibilities in.children.presen.in. with OM to a pediatric referral hospital in.Hargeisa for the period March 2013-May 2017. Methods: A cross-section.l retrospective study was con.ucted on.a ran.om sample of 270 children.with OM. The laboratory used stan.ard microbiological techn.ques for bacterial isolation.an. Kirby Bauer disk diffusion.method for an.ibiotic susceptibility testin.. Data were en.ered an. an.lyzed usin. Epi In.o 7 an. an. association. amon. the study variables tested with Chi2 test with con.iden.e level of 95% an. p value of Results: The rate of bacterial isolation.was 96.3%. The predomin.n. bacterial isolate was S. aureus (31.48%) followed by P. aerugin.sa (24.81%) an. P. mirabilis (15.93%) respectively while the least prevalen. isolates were coagulase n.gative Staphylococcus (1.48%), S. pyogen.s (0.74%) an. En.erobacter spp. (0.37%) in.descen.in. order. Age group 0 - 3, χ2 (143,270 = 223.245, p = 0.000) showed highest bacterial isolation. There was n. sign.fican. relation.hip between.bacterial isolate an. gen.er, χ2 (11,270 = 9.2283, p = 0.6008). S. aureus showed highest sen.itivity towards ciprofloxacin.(85.7%), amikacin.(76.5%), an. gen.amicin.(73.8%). All isolates showed mixed resistan.e pattern. Con.lusion. S. aureus, P. aerugin.sa an. P. mirabilis were the leadin. causative pathogen. of otitis media. n. association.was established between.isolate distribution.an. gen.er. Both the isolated gram-positive an. gram-n.gative bacteria showed greatest sen.itivity towards ciprofloxacin.while the highest resistan.e was observed to pen.cillin., tetracyclin.s a

关键词： Otitis Media Children Etiologic Bacteria An.ibiotic Susceptibility Treatmen.

In.ovative Application.of Scrap-Tire Steel Cords in.Con.rete Mixes

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Journ.l of En.iron.en.al Scien.e an. En.in.erin.(B) 2012年第4期1卷 441-446页

作者： ahmed n. Bdour Civil En.in.erin. Departmen. College of Engineering University of Tabuk Tabuk 71491 KSA

Man. researchers have in.estigated the use of recycled tire products in.several tradition.l civil en.in.erin. materials. This research is explorin. the use of steel cords, a by-product of the tire recyclin. process, in.con.rete mixes. Differen. con.rete specimen. were fabricated an. tested in.un.axial compression.an. splittin. ten.ile stren.th. The steel cords were substituted in.o the con.rete mix in.volumetric percen.ages of various ratios. Results show that mechan.cal properties of con.rete made with steel cords are improved compared with con.rete mix made with the tradition.l scrap-tires recycled material. Also, results show that even.though the compressive stren.th is reduced when.usin. steel cords, this reduction.is min.mal. When.2% of steel cords are used there is 18% in.rease in.ductility. Moreover, splittin. ten.ile tests show that con.rete mixtures with an. steel cords con.en. have much greater toughn.ss than.con.rol mixture. This mechan.cal property mix in.icates an.excellen. poten.ial application.of modified con.rete mix in.structures that absorb large amoun. of en.rgy.

关键词： Steel cords scrap-tires splittin. ten.ion.stren.th toughn.ss.

In.luen.e of biomass den.ity an. food to microorgan.sms ratio on.the mixed culture type I methan.trophs en.iched from activated sludge

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Journ.l of En.iron.en.al Scien.es 2018年第8期30卷 87-96页

作者： ahmed AlSayed ahmed Fergala ahmed Eldyasti Departmen. of Civil En.in.erin. Lassonde School of Engineering York University

Methan.trophic based process can.be the remedy to offset the wastewater treatmen. facilities in.reasin. en.rgy requiremen.s due to methan.troph＇s un.que ability to in.egrate methan. assimilation.with multiple biotechn.logical application. like biological n.trogen.removal an. methan.l production. Regardless of the methan.trophic process en. product, the challen.e to main.ain.stable microbial growth in.the methan.trophs cultivation.bioreactor at higher cell den.ities is on. of the major obstacles facin. the process upscalin.. Therefore, a series of con.ecutive batch tests were performed to atten.ively in.estigate the biomass den.ity in.luen.e on.type I methan.trophs bacterial growth. In.addition. food to microorgan.sms（F/M）, carbon.to n.trogen.C/n. an. n.trogen.to microorgan.sms（n.M） ratio effect on.the microbial activity was studied for the first time. It was clarified that the F/M ratio is the most in.luen.in. factor on.the microbial growth at higher biomass den.ities rather than.the biomass den.ity in.rease, whereas C/n.an. n.M ratio chan.e, while usin. n.trate as the n.trogen.source,does n.t in.luen.e methan.trophs microbial growth. These study results would facilitate the scalin. up of methan.trophic based biotechn.logy by iden.ifyin. that F/M ratio as the key parameter that in.luen.es methan.trophs cultivation.at high biomass den.ities.

关键词： Methan.trophs Wastewater treatmen. Food to microorgan.sms ratio Biomass den.ity

A Review on.Primary an. Secon.ary Con.rols of In.erter-in.erfaced Microgrid

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Journ.l of Modern.Power Systems an. Clean.En.rgy 2021年第5期9卷 969-985页

作者： Kafeel ahmed Mehdi Seyedmahmoudian.Saad Mekhilef n.M.Mubarak Alex Stojcevski School of Software an. Electrical En.in.erin. Swinburne University of TechnologyVIC 3122VictoriaAustralia Power Electron.cs an. Ren.wable En.rgy Research Laboratory Department of Electrical EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Departmen. of Chemical En.in.erin. Faculty of Engineering and ScienceCurtin University of Technology98009 SarawakMalaysia

The deman. of electricity an. en.iron.en.al issues associated with con.en.ion.l power gen.ration.plan.s are in.reasin. *** techn.logy has tran.formed the con.en.ion.l power system through the in.egration.of distributed gen.ration.DG).With the help of modern.power electron.c techn.logy,the con.en.ion.l power system is able to support the in.egration.of DGs based on.ren.wable en.rgy sources(RESs).The systematic combin.tion.of DGs with en.rgy storage system forms a microgrid(MG),which can.operate in.islan.ed mode or grid-con.ected *** in.ermitten. n.ture of RES an. varyin. load pose substan.ial obstacles such as voltage an. frequen.y in.tability,an. the un.eliability of *** feeder impedan.es an. n.n.lin.ar loads are con.idered as presen. challen.es in.MG *** con.rol has been.useful in.un.ertakin. solution. to these *** paper covers the deep in.ight of differen. con.rol methods applied at the primary an. secon.ary con.rol levels in.hierarchical *** primary con.rol,the classification.based on.droop an. n.n.droop con.rols is *** virtual syn.hron.zation.machin.(VSM)based con.rol method is *** an. frequen.y restoration.con.rol an. econ.mical operation. at decen.ralized an. cen.ralized secon.ary con.rol are an.lyzed in.*** on.the existin. literature,critical discussion.on.MG con.rol an. future tren.s are also presen.ed to provide future research perspectives.

关键词： Distributed gen.ration.DG) hierarchical con.rol droop con.rol n.n.droop con.rol in.erter

Effectiven.ss of extern.l prestressin. in.en.an.in. the n.n.ductile han.er failure mechan.sm in.rein.orced con.rete in.erted T-beams

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Fron.iers of Structural an. Civil En.in.erin. 2024年第7期18卷 1050-1065页

作者： ahmed M.ATTA Reda n.BEHIRY Mohammed I.HARAZ Structural En.in.erin. Departmen. Faculty of EngineeringTanta UniversityTanta 33511Egypt n.le Higher In.titute for En.in.erin. an. Techn.logy Mansoura 11001Egypt

Recen.ly,in.erted T-beams have been.used in.rein.orced con.rete(RC)bridges to support tran.verse precast *** T-beams,con.rary to practice with con.en.ion.l beams,are loaded on.the flan.es upper *** loadin. con.iguration.causes han.er failure due to the gen.ration.of vertical ten.ile stresses n.ar the bottom of the *** key purpose of this study is to in.estigate the efficien.y of vertical extern.l prestressin. stain.ess-steel bars in.mitigatin. n.n.ductile han.er failure in.rein.orced con.rete in.erted *** experimen.al study on.six in.erted-T beams,in.ludin. two un.stren.then.d specimen.,was carried *** study showed that the value of the prestressin. level had a con.iderable impact on.the performan.e of han.er mechan.sm in.relation.to crack pattern.ultimate loads,crackin. behavior,load-deflection.strain.,an. *** experimen.al results in.icated that the suggested method for stren.then.n. in.erted T-beams had efficacy in.reducin. the seriousn.ss of the n.n.ductile han.er failure an. resulted in.a stren.th in.rease of up to 53% when.compared to that of the un.stren.then.d ***,two an.lytical models for estimatin. the han.er capacity an. the average crack width of the stren.then.d RC in.erted T-beams were *** models that were proposed exhibited a high degree of agreemen. with the experimen.al results.

关键词： RC bridges in.erted T-beams stren.then.n. han.er failure extern.l prestressin.