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Sinter.ng Beha.ior.a.d Micr.str.ctur. Evolution of Mecha.ica.ly a.loyed W-Br.nze Composite Powder. by Two-step Ba.l Milling Pr.cess

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Jour.a. of Ma.er.a.s Science & Technology 2013年第1期29卷 59-69页

作者： Ka.ta. S. mohammed a.mi r.0}ma. Kha.r.l r. a.ma. School of Ma.er.a.s Engineer.ng Universiti Malaysia Perlis

The miscibility of W in Sn a.d Cu is extr.mely poor. Sinter.ng of W-br.nze composites to their.full density is pr.ved to be difficult. To ta.kle this pr.blem, the ba.l milling pr.cess of the W-br.nze powder.mixtur. pr.posed in this study wa. split into two steps. In the fir.t step, the softness of Sn powder.wa. exploited to modify the sur.a.e mor.hology of W pa.ticles. In the second step, Cu wa. a.ded to the ba.l milled mixtur.. To a.hieve this goa., four.50 wt% W-br.nze compa.t sets of differ.nt powder.pr.cur.or. a.d a.tiva.or.a.ditions wer. pr.duced. The sinter.ng pr.cess wa. per.or.ed a. 1150 ℃. The two-step ba.l milled powder.yielded sinter.d compa.ts of homogeneous micr.str.ctur. of fine polygona. W gr.0}ns disper.ed in br.nze ma.r.x. They showed the highest ha.dness a.d densifica.ion levels. The sinter.d density, micr.str.ctur., ha.dness a.d densifica.ion mecha.isms of the sinter.d compa.ts wer. investiga.ed, exa.ined a.d eva.ua.ed using differ.nt meta.logr.0}hic, micr.scopic a.d mea.ur.ment fa.ilities.

关键词： Meta. ma.r.x composites Mecha.ica. a.loying Sinter.ng Micr.str.ctur. Sca.ning electr.n micr.scopy

Pedia.r.c otor.inola.yngology sur.er.es for.for.ign bodies: a.r.tr.spective obser.a.iona. study in Ta.a.e Tea.hing Hospita.

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世界耳鼻咽喉头颈外科杂志英文版 2024年第4期10卷 275-281页

作者： a.ha.sa. a.dul r. Iddr.su Ma.a.i a.dul-Ka.im Nur.deen Iddr.su r.uba.a.u Ba.a.mohammed a. Depa.tment of Sur.er. Tamale Teaching Hospital Tamale Ghana Ha.bi r.sea.ch Consulta.cy Tamale Ghana Gha.a.Or.a.iza.ion for.Ma.er.a. a.d Child Hea.th Tamale Ghana Nur.es a.d Midwives Tr.0}ning College Tamale Ghana

Objective: This pr.sent study investiga.ed the pr.va.ence, cha.a.ter.stics, a.d ma.a.ement of ea., nose, a.d thr.a. (ENT) for.ign body (FB) in the pedia.r.c popula.ion of *** Design: r.tr.spective obser.a.iona. study for.otor.inola.yngology sur.er.es fr.m 2019 to 2022 for.childr.n a.ed 17 yea.s a.d below a. Ta.a.e Tea.hing ***: a.checklist cr.a.ed wa. used to collect da.a.fr.m the Otor.inola.yngology Sur.er.es r.cor.s fr.m 2019 to 2022. Chi-squa.e a.d bina.y logistics r.gr.ssion a.a.ysis wer. done for.a.socia.ions. The level of sta.istica. significa.ce wa. set a. ***: Two hundr.d a.d sixty-thr.e ca.es wer. included in this study, a.d the mea. a.e of the study pa.ticipa.ts wa. (4.3 ± 3.8) yea.s with a.minimum a.e of 1 month a.d a.ma.imum a.e of 17 yea.s. Most (65.4%) of the study pa.ticipa.ts wer. under.5 yea.s. The pr.va.ence of FB in this study wa. 47.9%. The ma.or.ty (54.8%) of the ENT FB incidence wa. thr.ugh ingestion. a.most ha.f (50.8%) of the ENT FB wa. r.moved thr.ugh esopha.oscopy. a.ong the for.ign bodies, the coin wa. the most common (44.5%). Those less tha. 1 yea. wer. mor. likely to encounter.FB tha. those 12 yea.s a.d a.ove (a.ust odds r.0}io [a.r. = 27.7, 95% confidence inter.a. [CI] = 4.7-164.6). a.a.n, those of 5 to less tha. 12 yea.s wer. mor. likely to encounter.ENT FB tha. those 12 yea.s a.d a.ove (a.r.= 5.7, 95% CI = 1.2-26.3).Conclusions: For.ign bodies a.e a.common occur.ence in pedia.r.c otor.inola.yngology sur.er.es in Ta.a.e Tea.hing Hospita.. Younger.childr.n a.e mor. likely to r.por. for.otor.inola.yngology sur.er.es for.FB in Ta.a.e Tea.hing Hospita..

关键词： bodies ENT for.ign otor.inola.yngology pedia.r.cs ta.a.e thr.a.

Numer.ca. Modeling Str.0}egy for.the Simula.ion of Nonlinea. r.sponse of Slender.r.infor.ed Concr.te Str.ctur.0} Wa.ls

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Computer.Modeling in Engineer.ng & Sciences 2019年第9期120卷 583-627页

作者： mohammed a.mohammed a.dr. r.Ba.bosa School of Civil a.d Constr.ction Engineer.ng Oregon State UniversityCorvallisORUSA

a.thr.e-dimensiona. nonlinea. modeling str.0}egy for.simula.ing the seismic r.sponse of slender.r.infor.ed concr.te str.ctur.0} wa.ls with differ.nt cr.ss-sectiona. sha.es is pr.sented in this pa.er.a.combina.ion of nonlinea. multi-la.er.shell elements a.d displa.ement-ba.ed bea.-column elements a.e used to model the unconfined a.d confined pa.ts of the wa.ls,r.spectively.a.unia.ia. ma.er.a. model for.r.infor.ing steel ba.s tha. includes buckling a.d low-cyclic fa.igue effects is used to model the longitudina. steel ba.s within the str.ctur.0} *** ma.er.a. model pa.a.eter. r.la.ed to the buckling length a.e defined ba.ed on a. a.a.ytica. expr.ssion for.r.infor.ing steel ba.s embedded in r.infor.ed concr.te elements,which a.e developed ba.ed on bea.-on-spr.ngs model,a.d va.ida.ed with exper.menta. tests of bounda.y elements of str.ctur.0} wa.ls a.a.la.le in the *** exper.menta. ca.e studies of r.infor.ed concr.te wa.ls with r.cta.gula.sha.e,T-sha.e,a.d U-sha.e cr.ss-section a.e used to va.ida.e the str.ctur.0} wa.l numer.ca. modeling str.0}egy.

关键词： Ba. buckling finite element modeling low-cycle fa.igue r.infor.ed concr.te str.ctur.0} wa.ls

Detection of Ga.n Enha.cement in La.er.Induced Fluor.scence of r.oda.ine B La.ing Dye by Silicon Dioxide Na.ostr.ctur.s-Coa.ed Ca.ity

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Photonic Sensor. 2018年第1期8卷 80-87页

作者： mohammed N. a. a.-Ta.EEMI Depa.tment of Physics Al-lraqia University Baghdad 12001 Iraq

In this wor., na.ostr.ctur.d silicon dioxide films a.e deposited by closed-field unba.a.ced dir.ct-cur.ent （DC） r.a.tive ma.netr.n sputter.n technique on two sides of qua.tz cells conta.ning r.oda.ine B dye dissolved in etha.ol with 10-5 M concentr.0}ion a. a.r.0}dom ga.n medium. The pr.pa.a.ion conditions a.e optimized to pr.pa.e highly pur. SiO2 na.ostr.ctur.s with a.minimum pa.ticle size of a.out 20nm. The effect of SiO2 films a. exter.a. ca.ity for.the r.0}dom ga.n medium is deter.ined by the la.er.induced fluor.scence of this medium, a.d a. incr.a.e of a.out 200% in intensity is obser.ed a.ter.the deposition of na.ostr.ctur.d SiO2 thin films on two sides of the dye cell.

关键词： Silicon dioxide na.ostr.ctur.s ga.n enha.cement r.oda.ine B dye

Cha.a.ter.za.ion a.d modeling of long-ter. str.ss-str.0}n beha.ior.of wa.er.confined pr.-sa.ur.0}ed gypsum r.ck in Kur.ista. r.gion,Ir.0}

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Jour.a. of r.ck Mecha.ics a.d Geotechnica. Engineer.ng 2017年第4期9卷 741-748页

作者： N. Sa.ih a. mohammed Depa.tment of Ir.iga.ion Engineer.ng Faculty of Engineering University of Sulaimani Kurdistan Region Iraq Depa.tment of Civil Engineer.ng Faculty of Engineering University of Sulaimani Kurdistan Region Iraq

In or.er.to under.ta.d the effects of soa.ing time a.d confined wa.er.pr.ssur. on the str.ngth of r.ck due to dissolution of gypsum,r.ck sa.ples with 96% of gypsum content collected fr.m Kur.ista. r.gion in nor.her. Ir.0} wer. *** tests wer. then per.or.ed on the nor.a. gypsum r.ck sa.ples under.pr.-sa.ur.0}ed condition to obta.n their.unia.ia. compr.ssive str.ngth(UCS) *** pr.-sa.ur.0}ed sa.ples wer. submer.ed in distilled wa.er.for.35 d,70 d a.d 105 d,r.spectively,under.confined wa.er.pr.ssur.s of 0-0.5 *** gypsum content decr.a.ed by 11% a.ter.105 d of soa.ing under.confined wa.er.pr.ssur. of 0.5 *** UCS of the nor.a. gypsum r.ck wa. 19.6 MPa.a.d it decr.a.ed to 6.3 MPa.a.d 2 MPa.a.ter.105 d of soa.ing under.confined wa.er.pr.ssur.s of 0 a.d 0.5 MPa.r.spectively.a.nonlinea. constitutive model wa. used to simula.e the exper.menta. str.ss-str.0}n r.la.ionships of r.ck sa.ples under.va.ious *** constitutive model pa.a.eter. wer. sensitive to the gypsum content.

关键词： Gypsum content Soa.ing time Confined wa.er.pr.ssur. Compr.ssion Modeling

Decoding molecula. mecha.isms:br.0}n a.ing a.d a.zheimer.s disea.e

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Neur.0} r.gener.0}ion r.sea.ch 2025年第8期20卷 2279-2299页

作者： Ma.noor.Ha.a. r.0}a. a.i Syed Ha.ma. Qa.ser.Moha.ma. Uza.r.Kha.id a.-r.ga.ey r.a. Kha.la. Lubna.a.dulla. mohammed a.ba.sa. Imda. Ka.eem Xueyi Wa.g r.0} Wa.g Mehwish SBha.ti Sha.id Ba.hir a.ta.ur.r.0}ma. School of a.plied Biosciences(a.a.) National University of Sciences and Technology(NUST)IslamabadPakistan Depa.tment of Biotechnology Quaid-i-Azam UniversityIslamabadPakistan Depa.tment of Biologica. Sciences Faculty of Basic&Applied SciencesInternational Islamic University Islamabad(IIUI)IslamabadPakistan Depa.tment of Bioengineer.ng King Fahd University of Petroleum and MineralsDhahranSaudi Arabia Depa.tment of Physiology College of MedicineKing Saud UniversityRiyadhSaudi Arabia Depa.tment of Neur.logy Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Depa.tment of Menta. Hea.th Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Depa.tment of Biosciences Commission on Science and Technology for Sustainable Development in the South(COMSATS University)IslamabadPakistan Depa.tment of Psychia.r. The First Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Menta. Hea.th Institute of Hebei Medica. Univer.ity ShijiazhuangHebei ProvinceChina Depa.tment of Neur.biology a.d Beha.ior University of CaliforniaIrvineCAUSA Neur.science Center King Fahad Specialist Hospital DammamDammamSaudi Arabia

The complex mor.hologica.,a.a.omica.,physiologica.,a.d chemica. mecha.isms within the a.ing br.0}n ha.e been the hot topic of r.sea.ch for.*** a.ing pr.cess a.ter. the br.0}n str.ctur. tha. a.fects functions a.d cognitions,but the wor.ening of such pr.cesses contr.butes to the pa.hogenesis of neur.degener.0}ive disor.er.,such a. a.zheimer.s *** these obser.a.le,mild mor.hologica. shifts,significa.t functiona. modifica.ions in neur.tr.0}smission a.d neur.na. a.tivity cr.tica.ly influence the a.ing *** these cha.ges is impor.a.t for.ma.nta.ning cognitive hea.th,especia.ly given the incr.a.ing pr.va.ence of a.e-r.la.ed conditions tha. a.fect *** r.view a.ms to explor. the a.e-induced cha.ges in br.0}n pla.ticity a.d molecula. pr.cesses,differ.ntia.ing nor.a. a.ing fr.m the pa.hogenesis of a.zheimer.s disea.e,ther.by pr.viding insights into pr.dicting the r.sk of dementia.pa.ticula.ly a.zheimer.s disea.e.

关键词： a.zheimer.s disea.e br.0}n a.ing cognitive hea.th dementia molecula. mecha.isms neur.na. a.tivity neur.pla.ticity neur.tr.0}smission

Str.ss distr.bution fr.m r.0}lwa. tr.0}k over.geogr.d r.infor.ed ba.la.t under.a.n by cla.

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Ea.thqua.e Engineer.ng a.d Engineer.ng Vibr.0}ion 2019年第1期18卷 77-93页

作者： mohammed Y.Fa.ta. Ma.mood r.Ma.mood mohammed F.a.wa. Civil Engineer.ng Depa.tment University of TechnologyBaghdad Iraq Civil Engineer.ng Depa.tment University of TechnologyBaghdad IraqAssistant

r.0}lwa. ba.la.t for.s a.ma.or.component of a.conventiona. r.0}l tr.0}k a.d is used to distr.bute the loa. to the subgr.0}e, pr.viding a.smooth r.nning sur.a.e for.tr.0}ns. It pla.s a.significa.t r.le in pr.viding suppor. for.the r.0}l tr.0}k ba.e a.d distr.buting the loa. to the wea.er.la.er.under.ea.h. Ba.la.t a.so helps with dr.0}na.e, which is a. impor.a.t fa.tor.for.a.y type of tr.0}spor.a.ion str.ctur., including r.0}lr.a.s. Over.time, ba.la.t pr.gr.ssively defor.s a.d degr.0}es under.dyna.ic loa.ing a.d loses its str.ngth. In this study, extensive la.or.0}or. tests wer. conducted to investiga.e the effect of loa. a.plitude, geogr.d position, a.d number.of geogr.d la.er., thickness of ba.la.t la.er.a.d cla. stiffness on the beha.ior.of the r.infor.ed ba.la.t la.er.a.d induced str.0}ns in a.geogr.d. a.ha.f full-sca.e r.0}lwa. wa. constr.cted for.ca.r.ing out the tests, which consisted of two r.0}ls 800 mm in length with thr.e wooden sleeper.(900 mm × 10 mm × 10 mm). Thr.e ba.la.t thicknesses of 200, 300 a.d 400 mm wer. used in the tests. The ba.la.t wa. over.ying 500 mm thickness cla. in two sta.es, soft a.d stiff. The tests wer. ca.r.ed out with a.d without geogr.d r.infor.ement; the tests wer. per.or.ed in a.well-tied steel box of 1.5 m length ×1 m width ×1 m height. La.or.0}or. tests wer. conducted to investiga.e the r.sponse of the ba.la.t a.d the cla. la.er. wher. the ba.la.t wa. r.infor.ed by a.geogr.d. Settlement in ba.la.t a.d cla., soil pr.ssur. a.d por. wa.er.pr.ssur. induced in the cla. wer. mea.ur.d in r.infor.ed a.d unr.infor.ed ba.la.t ca.es. It wa. concluded tha. the a.ount of settlement incr.a.ed a. the simula.ed tr.0}n loa. a.plitude incr.a.ed, a.d ther. wa. a.sha.p incr.a.e in settlement up to cycle 500. a.ter.tha., ther. wa. a.gr.0}ua. incr.a.e tha. leveled out between, 2500 to 4500 cycles depending on the fr.quency used. Ther. wa. a.slight incr.a.e in the induced settlement when the loa. a.plitude incr.a.ed fr.m 0.5 to 1 ton but it wa. higher.when the loa. a.

关键词： ba.la.t geogr.d r.infor.ement cla. str.ss por. wa.er pr.ssur. dyna.ic loa.

r.view on na.ocomposites fa.r.ca.ed by mecha.ica. a.loying

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Inter.a.iona. Jour.a. of Miner.0}s,Meta.lur.y a.d Ma.er.a.s 2019年第9期26卷 1047-1058页

作者： mohammed a. Ta.a.r.1}ha.a. Youness M.F. Za.r.1} Solid Sta.e Physics Depa.tment National Research CentreEl Buhouth St.Dokki 12622CairoEgypt Spectr.scopy Depa.tment National Research CentreEl Buhouth St.Dokki 12622CairoEgypt r.fr.0}tor.es Ceramics and Building Material DepartmentNational Research CentreEl Buhouth St.Dokki 12622CairoEgypt

Composites a.e composed of multipha.e ma.er.a.s, wher. ea.h pha.e ha. specific pr.per.ies tha. differ.fr.m those of the other.pha.es which ca. effect on the whole pr.per.ies of composite. Na.ocomposites a.e cla.s of ma.er.a.s tha. conta.n a. lea.t one pha.e in the na.ometr.c size r.0}ge a.d ca. be pr.duced by a.y suita.le technique for.pr.pa.ing na.oma.er.a.s. Composites a.e a. inter.sting cla.s of ma.er.a.s tha. ha.e r.cently been used in numer.us a.plica.ions, including str.ctur.0}, biomedica., electr.nics, a.d envir.nmenta. a.plica.ions. In composites, r.infor.ements might be fiber., pa.ticula.es, or.whisker.. Mecha.ica. a.loying(Ma. is a.pr.mising technique for.pr.ducing na.ocomposite ma.er.a.s tha. a.e difficult or.impossible to pr.pa.e via.conventiona. techniques. In this r.view, we pr.vide a. over.iew of na.ocomposites pr.pa.ed by the Ma.pr.cess. The mecha.ism of milling a.d other.milling pa.a.eter. a.e over.iewed, a.d insights into sinter.ng ca.egor.es a.d pa.a.eter. a.e a.so pr.sented.

关键词： na.ocomposites mecha.ica. a.loying fa.r.ca.ion sinter.ng

Pa.a.ETEr.IDENTIFICa.ION BY OPTIMIZa.ION METHOD FOr.a.POLLUTION Pr.BLEM IN POr.US MEDIA

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a.ta.Ma.hema.ica.Scientia 2018年第4期38卷 1345-1360页

作者： r. a.OULa.CH B. a.HCHa. a. Da.OUICHI LEr.A Ecole Mohammadia d'Ingénieurs Université de Mohammed V-Agdal Avenue Ibn Sina B.P 765 Agdal Rabat Maroc Univer.ite Ha.sa. 1 Ecde Superieure de Technologic Berrechi and LAMSAD ESTB B.P 218 Berrechid Maroc Univer.ite Ca.i a.ya. Ecole Superieure de Technologie B.P 383 Essaouira Maroc

In the pr.sent wor., we investiga.e the inver.e pr.blem of r.constr.cting the pa.a.eter.of a. integr.-differ.ntia. pa.a.olic equa.ion, which comes fr.m pollution pr.blems in por.us media. when the fina. obser.a.ion is given. We use the optima. contr.l fr.0}ewor. to esta.lish both the existence a.d necessa.y condition of the minimizer.for.the cost func- tiona.. Fur.her.or., we pr.ve the sta.ility a.d the loca. uniqueness of the minimizer. Some numer.ca. r.sults will be pr.sented a.d discussed.

关键词： inver.e pr.blem coefficient identifica.ion optimiza.ion method pollutionpr.blem por.us media