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Hea. tra.sfer of copper/wa.er na.ofluid flow through converging-diverging cha.nel

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Journa. of Centra. South University 2016年第2期23卷 484-496页

作者： mohamed Ra.ik Sa.I mohamed KEZZa. Ra.hid a.Ja.I Mecha.ica. Engineering Depa.tment University of Skikda Industria. Mecha.ics La.ora.ory Badji-Mokhtar University of Annaba

The ma.n objective of this work is to investiga.e a.a.ytica.ly the stea.y na.ofluid flow a.d hea. tra.sfer cha.a.teristics between nonpa.a.lel pla.e wa.ls. Using a.propria.e tra.sforma.ions for the velocity a.d tempera.ure, the ba.ic nonlinea. pa.tia. differentia. equa.ions a.e reduced to the ordina.y differentia. equa.ions. Then, these equa.ions ha.e been solved a.a.ytica.ly a.d numerica.ly for some va.ues of the governing pa.a.eters, Reynolds number, Re, cha.nel ha.f a.gle, α, Pra.dtl number, Pr, a.d Eckert number, Ec, using a.omia. decomposition method a.d the Runge-Kutta.method with ma.hema.ic pa.ka.e. a.a.ytica. a.d numerica. results a.e sea.ched for the skin friction coefficient, Nusselt number a.d the velocity a.d tempera.ure profiles. It is found on one ha.d tha. the Nusselt number increa.es a. Eckert number or cha.nel ha.f-a.gle increa.es, but it decrea.es a. Reynolds number increa.es. On the other ha.d, it is a.so found tha. the presence of Cu na.opa.ticles in a.wa.er ba.e fluid enha.ces hea. tra.sfer between nonpa.a.lel pla.e wa.ls a.d in consequence the Nusselt number increa.es with the increa.e of na.opa.ticles volume fra.tion. Fina.ly, a. excellent a.reement between a.a.ytica. results a.d those obta.ned by numerica. Runge-Kutta.method is highly noticed.

关键词： na.ofluid flow hea. tra.sfer copper na.opa.ticles inclined wa.ls a.a.ytica. solution

Completed Tensor Product a.d Fla.ness

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a.gebra.Colloquium 2020年第3期27卷 599-606页

作者： mohamed Ta.a. Depa.tment of Ma.hema.ics Faculty of Sciences Mohammed v University in RabatMorocco

We give,in a.more genera. ca.e tha. the Noetheria. ca.e,a. a.swer to the question posed by Sha.l on the fla.ness of the completed tensor product.

关键词： prea.ic topology completed tensor product coherent ring fla. module

Growth of ga. bubbles in the biotissues with convective a.celera.ion

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Interna.iona. Journa. of Bioma.hema.ics 2014年第6期7卷 223-238页

作者： S. a. Moha.ma.ein K. G. mohamed Depa.tment of Ma.hema.ics Faculty of Science Tanta University Tanta Egypt Depa.tment of Ma.hema.ics Faculty of Science Benha University Benha Egypt

This pa.er presents formula. a.d expla.a.ion a.out the growth of a.convective ga. bubble in the blood a.d other tissues of divers who surfa.e too quickly, concentra.ion distribution a.ound the growing bubble is a.so presented. The formula. a.e va.id a.l over the growth sta.es, i.e. under va.ia.le a.bient pressure while the diver is a.cending, a.d under consta.t a.bient pressure a. diving stops or a. sea.level. The ma.hema.ica. model is solved a.a.ytica.ly by using the method of combined va.ia.les. The growth process is a.fected by tissue diffusivity, concentra.ion consta.t a.d the initia. void fra.tion, which is the domina.t pa.a.eter. Results show tha., the time of the complete growth, in the convective growth model, is shorter tha. those ea.lier presented by Moha.ma.ein a.d mohamed [Concentra.ion distribution a.ound a.growing ga. bubble in tissue, Ma.h. Biosci. 225（1）（2010） 11-17] a.d Sriniva.a. et a.. [Ma.hema.ica. models of diffusion- limited ga. bubble dyna.ics in tissue, J. a.pl. Physiol. 86 （1999） 732-741] for the growth of a.sta.iona.y ga. bubble, this expla.ns the effect of bubble motion on consuming the oversa.ura.ed dissolved ga. from the tissue into growing bubble which lea.s to increment in the growth ra.e to be more tha. those presented in the previous sta.iona.y models.

关键词： Ga. bubble concentra.ion distribution convective growth method of com- bined va.ia.les.

Effect of different meta. sulfa.e precursors on structura. a.d ca.a.ytic performa.ce of zirconia.in dehydra.ion of metha.ol to dimethyl ether

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燃料化学学报 2018年第1期46卷 67-74页

作者： a.d El-a.iz a.Sa.d mohamed a.d El-a.l Chemistry Depa.tment Faculty of ScienceAssiut University71516 AssiutEgypt

ZrO_2 wa. trea.ed with 10% SO_4^(2-) from different meta. sulfa.e precursors for metha.ol dehydra.ion to dimethyl *** the sa.ples exhibited tetra.ona. pha.e a.d no diffra.tion pea.s corresponding to meta. sulfa.es or meta. oxides were *** FT-IR results revea.ed tha. there were different intera.tions between sulfa.e a.d ZrO_2,a.d this ha. a.grea. effect on the surfa.e a.ea.of the *** ca.a.ytic a.tivity wa. mea.ured over the ca.a.ysts in the tempera.ure ra.ge of 100-300 ℃.The results revea.ed tha. sulfa.ed zirconia.with CuSO_4·5 H_2O a.d a._2(SO_4)_3·16 H_2O showed the best ca.a.ytic *** ma.imum yield of DME ≈87% wa. obta.ned over CuSZ a. a.rea.tion tempera.ure of 275 ℃.Moreover,the ca.a.ytic a.tivity of the ca.a.ysts wa. correla.ed well with their surfa.e a.idity tha. mea.ured by dehydra.ion of isopropa.ol.

关键词： MSO 4/ZrO2 甲醇脱水 DME

a.Survey of Ra.ks a.d Qua.dles:Some Recent Developments

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a.gebra.Colloquium 2020年第3期27卷 509-522页

作者： mohamed Elha.da.i Depa.tment of Ma.hema.ics University of South Florida TampaFL 33620USA

This short survey conta.ns some recent developments of the a.gebra.c theory of ra.ks a.d *** report on some elements of representa.ion theory of qua.dles a.d ring theoretic a.proa.h to qua.dles.

关键词： ra.k qua.dle representa.ion ring isomorphism

a.ti-wea. properties eva.ua.ion of frictiona. sliding interfa.es in a.tomobile engines lubrica.ed by copper/gra.hene na.olubrica.ts

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Friction 2020年第5期8卷 905-916页

作者： mohamed Ka.a. a.med a.I Xia.jun HOU mohamed a.a.DELKa.EEM Hubei Key La.ora.ory of a.va.ced Technology for a.tomotive Components Wuhan University of TechnologyWuhan 430070China a.tomotive a.d Tra.tors Engineering Depa.tment Faculty of EngineeringMinia UniversityEl-Minia 61111Egypt Hubei Colla.ora.ive Innova.ion Center for a.tomotive Components Technology Wuhan 430070China

Owing to the significa.ce of improving fuel economy, reducing emissions, a.d extending the dura.ility of engine components, this study focused on the tribologica. performa.ce of na.o-a.ditives. In this study, copper (Cu) a.d gra.hene (Gr) na.oma.eria.s were dispersed in a.fully formula.ed engine oil (5W-30) with different concentra.ions. The tribologica. tria.s were investiga.ed under va.ious speeds a.d loa.s, utilizing a.reciproca.ing tribometer to mimic the ring/liner interfa.es in the engine. The frictiona. surfa.e morphologies were com-prehensively a.a.yzed using electron probe X-ra. microa.a.ysis (EPMa., field emission sca.ning electron microscopy (FESEM), energy dispersive spectrometer (EDS), a.d three dimensiona. (3D) surfa.e profilometry to explore the mecha.isms responsible for improving the tribologica. performa.ce of the frictiona. sliding pa.ts in the engine. The tribologica. test results illustra.ed tha. lubrica.ion by na.o-a.ditives reduced the wea. ra.e (WR) a.d friction coefficient (COF) by 25%–30% a.d 26.5%–32.6%, respectively, a. compa.ed with 5W-30. The results showed tha. this is a.promising a.proa.h for increa.ing the dura.ility a.d lifespa. of frictiona. sliding components a.d fuel economy in a.tomobile engines.

关键词： engine tribology na.oma.eria. na.olubrica.t friction wea. tribofilm

Robust design a.d a.a.ysis for opto-mecha.ica. two a.ra. la.er wa.ning system

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Defence Technology（防务技术） 2023年第9期27卷 46-52页

作者： Ma.ha. Ta.el mohamed Sheha.a.mohamed Ma.rouk a.dla.hma. a.el mohamed Sha.y Shokry Mosta.a.a.shershby Fa.ulty of Engineering Alexandria UniversityAlexandriaEgypt Egyptia. a.r Defense Colla.e AlexandriaEgypt La.er a.d Optoelectronics Depa.tment Technical Research CenterEgypt

In the pa.t three deca.es,la.er wa.ning systems(LWS)ha.e emerged in grea. importa.ce,a. the development of la.er-guided wea.ons,such a. a.rborne Hellfire missiles,ha. increa.ed,posing a. imminent threa. to vita. a.ea. a.d *** la.er wa.ning sta.ion(LWS)ca. detect,cla.sify,identify,a.d give a.a.m from la.er threa. a. a.very short time with high ***,the designers of this system must ta.e into a.count the detecta.ility a.d field of view to cover the a.ea.to be *** ma.n contribution in this resea.ch is a. a.a.ytica. design of LWS tha. consists of 24 detector elements,distributed in two a.ra.s(2×12)***,ca.cula.ing the best dista.ce between the detectors a.cording to the la.er bea. spot *** a.dition,enha.cement la.er wa.ring sensor detection ca.a.ility a.d detection performa.ce FOV between the detectors to increa.e covera.e a.ea.up to 360°.Moreover,decrea.ing dea. zone a.ea.between the la.er detectors *** ca.cula.ions a.d illustra.ions ma.e to rea.h the best systema.ic design.

关键词： LWS Field of view Detector elements

Liver tra.ma. Wha. current ma.a.ement?

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Hepa.obilia.y & Pa.crea.ic Disea.es Interna.iona. 2018年第1期17卷 39-44页

作者： mohamed Ta.chouli mohamed Ela.si Noureddine Njoumi mohamed Essa.ghini Ma.joub Echa.ra. mohamed Ra.hid Chkoff Depa.tment of Digestive Surgery Mohammed V Military Hospital Faculty of Medicine and Pharmacy Sidi Mohamed Ben Abdellah University Depa.tment of Viscera. Surgica. Emergency Ibn Sina Hospital Faculty of Medicine and Pharmacy Mohammed V University Depa.tment of Digestive Surgery Mohammed V Military Hospital Faculty of Medicine and Pharmacy Mohammed V University

Ba.kground: The liver is the most commonly da.a.ed orga. in a.domina. tra.ma. The ma.a.ement of liver tra.ma.ha. experienced ma.y cha.ges over the la.t two deca.es. Currently there is a.trend towa.d a.non-opera.ive trea.ment wa.ra.ted by the successful pedia.ric experience a.d better results recorded in ma.y tra.ma.centers worldwide. This study a.med to eva.ua.e outcomes of opera.ive a.d non-opera.ive ma.a.ement of liver tra.ma.in our institution over the la.t five ***: The pa.ients with a.dia.nosis of blunt or penetra.ing liver injuries, a.mitted a.d ma.a.ed in our hospita. from Ja.ua.y 2012 to December 2016 were retrospectively studied. The pa.ients were divided into 2 groups, opera.ed a.d non-opera.ed groups, a.cording to the initia. ma.a.ement considered a.propria.e a. the time of pa.ient a.mission. Clinica. fea.ures a.d outcomes were ***: The study involved 83 pa.ients, with a.mea. a.e of 33 yea.s a.d a.ma.ked ma.e predomina.ce(85.5%). The most common type of lesions wa. blunt tra.ma.a.d the ma.n ca.se wa. roa. tra.fic a.cidents. Sixty-eight liver injuries(81.9%) were of low severity(gra.es Ⅰ,Ⅱ,Ⅲ), while 15(18.1%) were of high severity(gra.e Ⅳ or grea.er). Fifty-six pa.ients(67.5%) ha. multiple injuries. Surgica. trea.ment wa. performed in 26(31.3%) pa.ients. Non-opera.ive ma.a.ement wa. underta.en in 57 ca.es(68.7%). The morbidity a.d morta.ity ra.es were clea.ly lower in non-opera.ive pa.ients compa.ed to those in the opera.ed ***: Ca.eful non-opera.ive ma.a.ement is a. a.equa.e thera.eutic stra.egy for the pa.ients suffering from liver tra.ma.with sta.le hemodyna.ics. Pa.ients with complex hepa.ic tra.ma.a.d especia.ly those with other orga. injuries continue to ha.e significa.tly higher morta.ity.

关键词： Liver tra.ma Non-opera.ive ma.a.ement Surgica. trea.ment

a.New Decision-Ma.ing Model Ba.ed on Plithogenic Set for Supplier Selection

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Computers, Ma.eria.s & Continua 2021年第3期66卷 2751-2769页

作者： mohamed a.del-Ba.set Reha. mohamed Florentin Sma.a.da.he mohamed Elhoseny Fa.ulty of Computers a.d Informa.ics Zagazig UniversityZagazig44519Egypt Ma.h&Science Depa.tment University of New MexicoGallupNew Mexico87301USA College of Computer Informa.ion Technology American University in the EmiratesDubaiThe United Arab Emirates

Supplier selection is a.common a.d releva.t pha.e to initia.ize the supply cha.n processes a.d ensure its *** choice of supplier is a.multicriteria.decision ma.ing(MCDM)to obta.n the optima. decision ba.ed on a.group of *** hea.th ca.e sector fa.es severa. types of problems,a.d one of the most importa.t is selecting a. a.propria.e supplier tha. fits the desired performa.ce *** development of service/product qua.ity in hea.th ca.e fa.ilities in a.country will improve the qua.ity of the life of its *** pa.er proposes a. integra.ed multi-a.tribute border a.proxima.ion a.ea.compa.ison(Ma.a.)ba.ed on the best-worst method(BWM),plithogenic set,a.d rough *** is a.plied to regula.e the weight vector of the mea.ures in group decision-ma.ing problems with a.high level of *** the trea.ment of uncerta.nty,a.plithogenic set a.d rough number(RN)a.e used to improve the a.cura.y of *** set opera.ions a.e used to dea. with informa.ion in the desired ma.ner tha. ha.dles uncerta.nty a.d ***,ba.ed on the plithogenic a.grega.ion a.d the results of BWM eva.ua.ion,we use Ma.a. to find the optima. a.terna.ive a.cording to defined *** exa.ine the proposed integra.ed a.gorithm,a. empirica. exa.ple is produced to select a. optima. supplier within five options in the hea.thca.e industry.

关键词： Supplier selection rough set theory Ma.a. MCDM BWM plithogenic set