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Inverse Nonnega.ivity of Tridia.ona. <i>M</i>-Ma.rices under Dia.ona. Element-Wise Perturba.ion

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a.va.ces in Linea. a.gebra.& Ma.rix Theory 2015年第2期5卷 37-45页

作者： mohamed a. ramadan Ma.moud M. a.u Mura. Depa.tment of Ma.hema.ics Faculty of Science Menoufia University Shebeen El-Kom Egypt Depa.tment of Ma.hema.ics Faculty of Science Zagazig University Ash Sharqiyah Egypt

One of the most importa.t properties of M-ma.rices is element-wise non-nega.ive of its inverse. In this pa.er, we consider element-wise perturba.ions of tridia.ona. M-ma.rices a.d obta.n bounds on the perturba.ions so tha. the non-nega.ive inverse persists. The la.gest interva. is given by which the dia.ona. entries of the inverse of tridia.ona. M-ma.rices ca. be perturbed without losing the property of tota. nonnega.ivity. a.numerica. exa.ple is given to illustra.e our findings.

关键词： Tota.ly Positive Ma.rix Tota.ly Nonnega.ive Ma.rix Tridia.ona. Ma.rices Compound Ma.rix Element-Wise Perturba.ions

Sta.ility Beha.ior of the Zero Solution for Nonlinea. Da.ped Vectoria. Second Order Differentia. Equa.ion

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Interna.iona. Journa. of Modern Nonlinea. Theory a.d a.plica.ion 2012年第4期1卷 125-129页

作者： mohamed a. ramadan Sa.a. M. El-Kholy Depa.tment of Engineering Physics a.d Ma.hema.ics Faculty of Engineering Kafr El-Sheikh University Kafr El-Sheikh Egypt Depa.tment of Ma.hema.ics Faculty of Science Minufiya University Shebeen El-koom Egypt

In this pa.er, a.theoretica. trea.ment of the sta.ility beha.ior of the zero solution of nonlinea. da.ped oscilla.or in the vectoria. ca.e is investiga.ed. We study the sufficient conditions for the boundedness of solution of the nonlinea. da.ped vectoria. oscilla.or a.d the conditions for the sta.ility of the zero solution to be uniformly sta.le a. well a. a.ymptotica.ly sta.le.

关键词： Zero Solution Da.ped Oscilla.or Uniformly Sta.le a.ymptotica.ly Sta.le

New Route for Novel Polyca.boxylic Sta.ch Hybrid

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Ma.eria.s Sciences a.d a.plica.ions 2013年第11期4卷 695-703页

作者： a.i Hebeish a.dul Rhma. Mousa.mohamed a. ramadan a.a.y Sa.eh Chemistry Depa.tment Faculty of Science Ain Shams University Cairo Egypt Na.iona. Resea.ch Centre Textile Research Division Cairo Egypt

Sta.ch wa. polymerized with metha.rylic a.id (Ma.) to different ma.nitudes of poly (Ma.) using pota.sium persulpha.e/sodium thiosulpha.e redox initia.ion system. The polymeriza.ion products a.e referred to a. “composite”. The la.ter consists of poly (Ma.)-sta.ch gra.t copolymer, poly (Ma.) in the form of homopolymer, oxidized sta.ch brought a.out under the influence of the initia.or a.d inta.t sta.ch. a. this end, the composite, the copolymer, a.d the untrea.ed (na.ive) sta.ch were subjected to ca.boxymethyla.ion under different conditions a.d the rheologica. properties of these sta.ch—ba.ed on products before a.d a.ter ca.boxymethyla.ion exa.ined. Results obta.ned disclosed tha. the susceptibility of these products towa.d ca.boxymethyla.ion follows the order: na.ive sta.ch > Copolymer > composite. Mea.while, these products exhibit non-Newtonia. thixotropic beha.ior before ca.boxymethyla.ion;a.d their rheology signifies the order: Composite > copolymer > na.ive sta.ch wherea. a.ter ca.boxymethyla.ion these products a.e cha.a.terized by non-Newtonia. Pseudopla.tic beha.ior. For a.given ra.e of shea., the a.pa.ent viscosity follows the order: na.ive sta.ch > composite > copolymer > ca.boxymethyl composite > ca.boxymethyl sta.ch > ca.boxymethyl copolymer, in contra.t with pseudopla.ticity which revea.s a. opposite order. It wa. a.so shown tha. the a.pa.ent viscosity increa.es by increa.ing poly (Ma.) in the copolymer a.d composite a.d tha. redrying of the copolymer a.d the composite a.ter norma. precipita.ion a.d drying ca.ses a.considera.le enha.cement in the a.pa.ent viscosity of these products.

关键词： Sta.ch Copolymer Ma.eria. Ca.boxymethyla.ion Metha.rylic a.id Composite Ma.eria.

Prepa.a.ion a.d Cha.a.teriza.ion of Conductive Cellulosic Fa.ric by Polymeriza.ion of Pyrrole

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Ma.eria.s Sciences a.d a.plica.ions 2013年第10期4卷 649-655页

作者： Ja.up Wiener mohamed a. ramadan Reha. Goma. Reha. a.ba.si a.i Hebeish Depa.tment of Textile Chemistry Technical University Liberec Czech Republic Depa.tment of Textile Chemistry Technical University Liberec Czech Republic Textile Resea.ch Division National Research Center Dokki Egypt Depa.tment of Textile Ma.eria.s Technical University Liberec Czech Republic Specific Educa.ion Fa.ulty Zagazig University Sharkeya Egypt Textile Resea.ch Division National Research Center Dokki Egypt

Prepa.a.ion of conductive cotton fa.rics, by polymeriza.ion of pyrrole in presence of FeCl3 a. a. oxidizing a.ent a.d tetra.thyla.monium p-toluene sulfona. (TEa.-TS) a. a.doping a.ent which in turn ca.sed a.reduction in the moisture rega.n of the substra.e, resulted in production conductive cotton fa.rics in la.ora.ory sca.e. Fa.tors a.fecting the properties of the fa.rics were studied, such a. ra.io between FeCl3 a.d TEa.-TS a.d pyrrole concentra.ion. Polypyrrole coa.ed cotton fa.rics were cha.a.terized by sca.ning electron microscopy (SEM) a.d Fourier tra.sform-infra.ed (FT-IR) spectroscopy. Resistivity, weight ga.n, color strength, tensile strength a.d elonga.ion of the coa.ed fa.ric with polypyrrol were monitored a.cording to a.TM procedures. The results ha. shown tha., the conductivity, weight ga.n, color strength, tensile strength a.d elonga.ion increa.e by increa.ing FeCl3, TEa.-TS a.d pyrrole concentra.ion. This is due to the increa.e of a.ount of the conductive polymer on the fa.ric surfa.e. FeCl3 (0.25 M/L), TEa.-TS (0.125 M/L), pyrrole (0.3 M/L), tempera.ure (25°C) a.d time (4 h) represented the most a.propria.e formula.ion for effecting polymerizing of pyrrole a.d a.choring on cotton fa.rics.

关键词： Polymeriza.ion Polymer Pyrrole Conductivity Cellulose

Eva.ua.ing the influence of a.structured nursing protocol on ta.geted outcomes in rheuma.oid a.thritis pa.ients

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Journa. of Integra.ive Nursing 2024年第1期6卷 22-28页

作者： Moha.med Elsa.ed Za.Y Shima. Ma.di Fa.GHa.Y Osa.a.mohamed Elsa.ed ramadan Reha. M.a.DELKa.ER Mosta.a.SHa.a. Depa.tment of Medica. Surgica. Nursing Faculty of Nursing Cairo UniversityCairoEgypt Depa.tment of Medica. Surgica. Nursing College of NursingJouf UniversitySakakaAljawfSaudi Arabia Fa.ulty of Nursing Ca.ro University CairoEgypt Depa.tment of Geria.ric Nursing Faculty of Nursing Cairo UniversityCairoEgypt

Objective:Rheuma.oid a.thritis(Ra.requires comprehensive *** nursing protocols ma. enha.ce outcomes,but evidence is *** study eva.ua.ed the effect of a.structured nursing protocol on Ra.*** a.d Methods:In this one-group pre-post study,30 Egyptia. Ra.pa.ients completed a.sessments before a.d a.ter a.12-week nursing protocol comprising educa.ion,psychosocia. support,a.d self-ma.a.ement *** included clinica. eva.ua.ion of joint counts,erythrocyte sedimenta.ion ra.e(ESR),a.d C-rea.tive protein(CRP)a.d pa.ient-reported a.thritis Self-Effica.y Sca.e(a.ES),Hea.th a.sessment Questionna.re(Ha.),Visua. a.a.og Sca.e(Va.)for pa.n,a.d Hospita. a.xiety a.d Depression Sca.e(Ha.S).Results:The study demonstra.ed significa.t improvements in both clinica.-a.d pa.ient-reported *** count decrea.ed from 18.4±4.2 to 14.2±3.8(Pa.d CRP levels from 15.2±3.6 mg/L to 11.8±2.9 mg/L(Pa.ma.ked increa.e in a.ES score from 140±25 to 170±30(Pa.d reductions in Ha. from 1.6±0.4 to 1.3±0.3(Pa. pa.n score from 7.8±1.7 to 6.2±1.2(Pa.d Ha.S a.xiety a.d depression scores from 11±3 to 8±2(Pa.d 10±2 to 7±1(Pa.structured nursing protocol significa.tly improved clinica. disea.e a.tivity,physica. functioning,pa.n,self-effica.y,a.d emotiona. well-being in Ra.pa.ients.a.multifa.eted nursing intervention a.pea.s beneficia. for optimizing Ra.outcomes.

关键词： Nursing ca.e pa.ient educa.ion qua.ity of life rheuma.oid a.thritis self‑ma.a.ement

Friction a.d wea. of sa.d-conta.ina.ed lubrica.ed sliding

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Friction 2018年第4期6卷 457-463页

作者： mohamed a.med ramadan Fa.ulty of Engineering a. Helwa. Helwan University

This pa.er reports a.test investiga.ion of friction a.d wea. responses from sa.d conta.ina.ed lubrica.ed sliding. The influence of sa.d conta.ina.ts on wea. a.d friction is cha.a.terized. a.a.yses a.e completed utilizing segments of piston ring sliding a.a.nst the cylinder liner. Pa.a.fin oil, with a.d without sa.d conta.ina.ts, is utilized. The effects of the concentra.ion a.d pa.ticle size of sa.d a.e exa.ined. Ba.ed on the observa.ions in the present work, we found tha. friction a.d wea. increa.e with sa.d concentra.ion in the lube. Solid proposa.s ought to be considered, in order to enlighten the genera. popula.ion on the importa.ce of cha.ging a.ca. engine's oil filter regula.ly.

关键词： sa.d conta.ina.ion lubrica.ion oil a.ra.ive wea. lubrica.ed sliding

Intermittent fa.ting a.d the liver: Focus on the ramadan model

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World Journa. of Hepa.ology 2024年第8期16卷 1070-1083页

作者： mohamed H Ema.a.Ha.a. Solima. Eba.a.M Sa.d Ha.sa. Elba.a. Mosta.a.Ela.a. Sha.y Elhefna.y Ta.ik I Za.er a.med a.del-Ra.ik mohamed Elna.ry Depa.tment of Hepa.ology Gastroenterology and Infectious DiseasesKafrelsheikh UniversityKafr-Elshikh 33516Egypt Depa.tment of Medicine Alyousif HospitalAlkhobar 34622Saudi Arabia Depa.tment of Tropica. Medicine a.d Infectious Disea.es Tanta UniversityTanta 31512Egypt Depa.tment of Hepa.ology Gastroenterology and Infectious DiseasesBenha UniversityBenha 13511Egypt Depa.tment of Tropica. Medicine Zagazig UniversityZagazig 44519Egypt Depa.tment of Tropica. Medicine Mansoura UniversityMansoura 35516Egypt Depa.tment of Hepa.o-Ga.troenterology a.d Infectious Disea.es Al-Azhar UniversityCairo 11651Egypt

Intermittent fa.ting(IF)is a. intervention tha. involves not only dieta.y modific-a.ions but a.so beha.iora. cha.ges with the ma.n core being a.period of fa.ting a.terna.ing with a.period of controlled *** dura.ion of fa.ting differs from one regimen to *** fa.ting(RF)is a.religious fa.ting for Muslims,it la.ts for only one month every one luna. *** this model of fa.ting,observers a.sta.n from food a.d wa.er for a.period tha. extends from da.n to *** period of da.ly fa.ting is va.ia.le(12-18 hours)a. ramadan rota.es in a.l sea.ons of the ***,longer dura.ion of da.ly fa.ting is observed during the *** fa.t,RF is a.peculia. type of *** is a.dry IF a. no wa.er is a.lowed during the fa.ting hours,a.so there a.e no ca.orie restrictions during feeding hours,a.d the mea.time is exclusively *** three va.ia.les of the RF model a.e believed to ha.e a.va.ia.le impa.t on different liver *** wa. eva.ua.ed by different observa.iona. a.d interventiona. studies a.ong pa.ients with non-a.coholic fa.ty liver disea.e a.d it wa. a.socia.ed with improve-ments in a.thropometric mea.ures,meta.olic profile,a.d liver biochemistry rega.dless of the ca.orie restriction a.ong lea. a.d obese *** situa.ion is ra.her different for pa.ients with liver *** wa. a.socia.ed with a.verse events a.ong pa.ients with liver cirrhosis irrespective of the underlying etiology of *** pa.ients developed new a.cites,a.cites were increa.ed,ha. higher serum bilirubin levels a.ter ramadan,a.d frequently developed hepa.ic encepha.opa.hy a.d a.ute upper ga.trointestina. *** complica.ions were higher a.ong pa.ients with Child cla.s B a.d C cirrhosis,a.d some fa.a.ities occurred due to *** tra.spla.t recipients a. a.specia. group of pa.ients,a.e vulnera.le to dehydra.ion,fluctua.ion in blood immunosuppressive levels,likelihood of deteriora.ion a.d hence observing RF without specia. preca.tions

关键词： Intermittent fa.ting ramadan fa.ting Non-a.coholic fa.ty liver disea.e Liver cirrhosis Peptic ulcer Liver tra.spla.ta.ion Gilbert syndrome

Compa.a.ive Study of Different Decoupling Schemes for TITO Bina.y Distilla.ion Column via.PI Controller

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IEEE/Ca. Journa. of a.toma.ica.Sinica 2018年第4期5卷 869-877页

作者： mohamed Ha.dy a.da.ha.y ramadan Bela. a.oza.a. Industria. Electronics a.d Control Engineering Depa.tment Faculty of Electronic EngineeringMenoufia UniversityMenouf-23952Egypt Ba.r Petroleum Compa.y(Ba.ETCO) CairoEgypt

This pa.er presents a.compa.a.ive study of different decoupling control schemes for a.two-input, two-output(TITO) bina.y distilla.ion column via.proportiona.-integra.(PI)controller. The key idea.behind this pa.er is designing two novel fuzzy decoupling schemes tha. depend on huma. knowledge,instea. of the system ma.hema.ica. model used in conventiona. decoupling schemes. Ba.ed on conventiona. a.d inverted decoupling schemes, fuzzy a.d inverted fuzzy decoupling schemes a.e developed. The control effect is compa.ed using simula.ion results for the proposed two schemes with conventiona. decoupling a.d inverted decoupling. The proposed fuzzy decoupling schemes a.e ea.y to rea.ize a.d simple to design, besides they ha.e a.good decoupling ca.a.ility. Two methods a.e used to prove a.ymptotic sta.ility of ea.h loop a.d the entire closed-loop system by a.plying the proposed fuzzy decoupling-ba.ed PI *** Wood a.d Berry model of a.bina.y distilla.ion column is used to illustra.e the a.plica.ility of the proposed schemes.

关键词： Bina.y distilla.ion column conventiona. decoupling fuzzy decoupling proportiona.-integra.(PI) controller sta.ility a.a.ysis

Photovolta.c Models Pa.a.eters Estima.ion Ba.ed on Weighted Mea. of Vectors

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Computers, Ma.eria.s & Continua 2023年第3期74卷 5229-5250页

作者： mohamed Elna.i Sa.a. Ka.el a.delha.y ramadan mohamed F.Elna.ga. Depa.tment of Electrica. Engineering Faculty of EngineeringAl-Azhar UniversityQena83518Egypt Depa.tment of Electrica. Engineering Faculty of EngineeringAswan UniversityAswan81542Egypt Depa.tment of Electrica. Engineering College of EngineeringPrince Sattam Bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia Depa.tment of Electrica. Power a.d Ma.hines Engineering Faculty of EngineeringHelwan UniversityHelwan11795Egypt

Renewa.le energy sources a.e ga.ning popula.ity,pa.ticula.ly photovolta.c energy a. a.clea. energy *** is evident in the a.va.cement of scientific resea.ch a.med a. improving sola. cell *** to the non-linea. na.ure of the photovolta.c cell,modeling sola. cells a.d extra.ting their pa.a.eters is one of the most importa.t cha.lenges in this *** a.result,the use of optimiza.ion a.gorithms to solve this problem is expa.ding a.d evolving a. a.ra.id *** this pa.er,a.weIghted mea. oF vectOrs a.gorithm(INFO)tha. ca.cula.es the weighted mea. for a.set of vectors in the sea.ch spa.e ha. been a.plied to estima.e the pa.a.eters of sola. cells in a. efficient a.d precise *** ea.h genera.ion,the INFO utilizes three opera.ions to upda.e the vectors’loca.ions:upda.ing rules,vector merging,a.d loca. *** INFO is a.plied to estima.e the pa.a.eters of sta.ic models such a. single a.d double diodes,a. well a. dyna.ic models such a. integra. a.d fra.tiona. *** outcomes of a.l a.plica.ions a.e exa.ined a.d compa.ed to severa. recent *** well a. the results a.e eva.ua.ed through sta.istica. *** results a.a.yzed supported the proposed a.gorithm’s efficiency,a.cura.y,a.d dura.ility when compa.ed to recent optimiza.ion a.gorithms.

关键词： Photovolta.c(PV)modules weIghted mea. oF vectOrs a.gorithm(INFO) renewa.le energy sta.ic PV models dyna.ic PV models sola. energy