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Mecha.ica. Ventila.ion Outcomes a. the NICU a. EL-Za.ra. University Hospita.

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Open Journa. of Pedia.rics 2020年第4期10卷 732-743页

作者： a.a.abdelka.er othman Zeina. Fa.a. Osha.b Ma.wa.El-Ha.y abd El Moneim Ba.helor of Medicine a.d Surgery Mansoura University Mansoura Egypt Pedia.rics a.d Neona.a.logy Depa.tment Faculty of Medicine for Girls Al-Azhar University Cairo Egypt Pedia.ric a.d Neona.a.logy Depa.tment Al Zahraa University Hospital Faculty of Medicine for Girls Al-Azhar University Cairo Egypt

Ba.kground: Mecha.ica. ventila.ion (MV) is one of the most common thera.ies in the neona.a. Intensive Ca.e Unit (NICU) a.d is a.socia.ed with increa.ed morbidity a.d morta.ity. MV is a.complex a.d highly specia.ized a...

Ba.kground: Mechanical ventilation (MV) is one of the most common therapies in the neonatal Intensive Care Unit (NICU) and is associated with increased morbidity and mortality. MV is a complex and highly specialized area in neonatology that has several complications related to different modes, techniques, and devices. Aim of the Study: To detect the causes of morbidity and mortality in mechanically ventilated neonates and to correlate the neonatal morbidity and mortality with gestational age, birth weight and duration of MV. Patients and Methods: a.>This prospective observation analytical study was carried out on 110 neonates who were admitted to NICU at Al-Zahraa university hospital on MV during the period from March 2019 to March 2020. All neonates were followed up till the time of discharge with record of any complications during mechanical ventilation. Detailed medical history, examination to detect indication of MV and laboratory, radiological investigations were recorded. As regard the general characterization of studied neonates, 64 (58.2%) were males while the rest 46 (41.8%) were females, 50 (45.4%) were full term (37 - 42 wks), 42 a. st

关键词： Mecha.ica. Ventila.ion Respira.ory Distress Syndrome Va.

Mea.urements of na.ura. ra.ionuclides in soil sa.ples from Upper Egypt

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Nuclea. Science a.d Techniques 2008年第5期19卷 302-307页

作者： Sha.a. Ra.a.a. Moha.ed Ha.B Kha.ed Sa.a.EL DIN abd Elba.et a.Ba.Y Moha.ed abd Elleh a.I Rolf MICHEL Physics Depa.tment Faculty of ScienceSouth Valley University Center for Ra.ia.ion Protection a.d Ra.ioecology Hanover University (ZSR)

This pa.er presents the results of na.ura. ra.ioa.tivity mea.ured for the soil of Qena.using ga.ma.ra. spectrometry a. ZSR,Ha.over University,*** sa.ples of ra.ioa.tive concentra.ions of ^(238)U-series (^(234)Th, ^(214)pb,a.d^(214)Bi),^(232)Th-series (^(228)a.,^(212)pb,a.d ^(208)T1) a.d ^(40)K were *** objectives were set:(1) a.tivity levels by surfa.e soil sa.pling a. 0～30 cm depth,(2) dose ra.es of ga.ma.ra.ia.ion,ra.ium equiva.ent,index ha.a.d, a.d effective dose,a.d (3) a.bient dose ra.es.

关键词：土壤环境放射能 γ光谱测定法辐射暴露环境剂量

Effect of Conductive Fillers on the Cyclic Stress-Stra.n a.d Na.o-Sca.e Free Volume Properties of Silicone Rubber

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Chinese Journa. of Polymer Science 2014年第5期32卷 558-567页

作者： M.H.abd-El Sa.a. S.El-Ga.a. M.Mohsen D.M.abd El-Ma.soud Physics Depa.tment Faculty of Education Ain Shams University Physics Depa.tment Faculty of Science Ain Shams University

The effect of ca.bon bla.k （CB） a.d gra.hite （G） powders on the ma.roscopic a.d na.o-sca.e free volume properties of silicone rubber ba.ed on poly（di-methylsiloxa.e）（PDMS） wa. studied through therma. a.d cyclic mecha.ica. mea.urements, a. well a. with positron a.nihila.ion lifetime spectroscopy （Pa.S）. The melting tempera.ure of the composites （Tm） a.d the endothermic entha.py of melting （ΔHm） were estima.ed by differentia. sca.ning ca.orimetry （DSC）. Tm a.d the degree of crysta.linity （χc） of PDMS composites were found to decrea.e with increa.ing the CB content. This ca. be expla.ned due to the increa.e in physica. cross-linking which results in a.decrea.e in the crysta.lite thickness. Besides, χc wa. found to be dependent on the filler type. Cyclic stress-stra.n beha.ior of PDMS loa.ed with different contents of filler ha. been studied. Mullins ra.io （RM） wa. found to be dependent on the filler type a.d content. It wa. found tha., RM increa.es with increa.ing the filler content due to the increa.e in physica. cross-linking which results in a.decrea.e in the size of free volume, a. observed through a.decrea.e of the o-Ps lifetime τ3 mea.ured by Pa.S. Moreover, the hysteresis in PDMS-CB composites wa. more pronounced tha. in PDMS-G composites. Furthermore, a.correla.ion wa. esta.lished between the free volume Vf a.d the mecha.ica. properties of PDMS composites conta.ning different fillers. a.nega.ive correla.ion wa. observed between Vf a.d RM.

关键词： Positron a.nihila.ion Positronium Free volume Si-rubber Composite Cyclic mecha.ica. properties.

Optimized Numerica. Model Ba.ed a.sessment of Wa.e Power Potentia. of Ma.ma.a.Sea

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Journa. of Ocea. University of China 2019年第2期18卷 293-304页

作者： abdOLLa.Za.EHMORa.I Ya.in OZGER Mehmet a.TUNKa.Na. abdüssela. Hydra.lics Division Department of Civil EngineeringIstanbul Technical University

Ma.ma.a.Sea. loca.ed between Bla.k Sea.a.d a.gea. Sea. is a. importa.t sea.for ocea. engineering a.tivities. In this study, wa.e power potentia. of Ma.ma.a.Sea.wa. investiga.ed using the third genera.ion spectra. wind-wa.e model MIKE 21 SW with unstructured mesh. Wind da.a.wa. obta.ned from ECMWF ERa.Interim re-a.a.yses wind da.a.et a. 10 m with a.spa.ia. resolution of 0.1? for the period of 1994 to 2014. The numerica. model wa. ca.ibra.ed with mea.ured wa.e da.a.from a.buoy sta.ion loca.ed in Ma.ma.a.Sea. Mesh optimiza.ion wa. a.so performed to obta.n the most suita.le mesh structure for the study a.ea. This study is the first tha. dea.t with the determina.ion of wa.e energy potentia. of Ma.ma.a.Sea. The numerica. model results a.e presented in terms of monthly, sea.ona. a.d a.nua. a.era.e of wa.e power flux(k W m^(-1)). The ma.imum wa.e power flux is 1.13 kW m^(-1) a.d occurs in November. The overa.l a.nua. mea. wa.e power flux during 1994–2014 is found to be 0.27 kW m^(-1) in the offshore regions.

关键词： Ma.ma.a.Sea MIKE 21 SW wa.e power potentia. ECMWF buoy wa.e da.a

MHD Bounda.y La.er Flow of a.Power-La. Na.ofluid Conta.ning Gyrota.tic Microorga.isms Over a. Exponentia.ly Stretching Surfa.e

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Computers, Ma.eria.s & Continua 2020年第2期62卷 525-549页

作者： Moha.ed abd El-a.iz a.M.a.y Depa.tment of Ma.hema.ics Faculty of ScienceKing Khalid UniversityAbha61411Saudi Arabia Depa.tment of Ma.hema.ics Faculty of ScienceHelwan UniversityHelwan-Cairo11795Egypt Depa.tment of Ma.hema.ics Faculty of ScienceSouth Valley UniversityQena83523Egypt

This study focusses on the numerica. investiga.ions of bounda.y la.er flow for ma.netohydrodyna.ic(MHD)a.d a.power-la. na.ofluid conta.ning gyrota.tic microorga.isms on a. exponentia.ly stretching surfa.e with zero na.opa.ticle ma.s flux a.d convective *** nonlinea. system of the governing equa.ions is tra.sformed a.d solved by Runge-Kutta.Fehlberg *** impa.ts of the tra.sverse ma.netic field,bioconvection pa.a.eters,Lewis number,na.ofluid pa.a.eters,Pra.dtl number a.d power-la. index on the velocity,tempera.ure,na.opa.ticle volume fra.tion,density of motile microorga.ism profiles is *** a.dition,the impa.ts of these pa.a.eters on loca. skin-friction coefficient,loca. Nusselt,loca. Sherwood numbers a.d loca. density number of the motile microorga.isms a.e *** results revea. tha. the power la. index is considered a. importa.t fa.tor in this *** to neglecting the buoya.cy force term,the bioconvection a.d na.ofluid pa.a.eters ha.e slight effects on the velocity *** resulta.t Lorentz force,from increa.ing the ma.netic field pa.a.eter,try to decrea.e the velocity profiles a.d increa.e the resca.ed density of motile microorga.isms,tempera.ure a.d na.opa.ticle volume fra.tion ***,a. a.gmenta.ion of power-la. index drops the reduced loca. skin-friction a.d reduced Sherwood number,while it increa.es reduced Nusselt number a.d reduced loca. density number of motile microorga.isms.

关键词： Bioconvection gyrota.tic microorga.isms ma.netohydrodyna.ic na.ofluid bounda.y la.er power-la.

Fa.r subca.rier-power a.loca.ion scheme for multiuser multica.rier systems

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Journa. of Centra. South University 2015年第8期22卷 3033-3041页

作者： Moha.med abd-Elna.y Germien G.Sedhom Na.y W.Messiha.Xu Zhu Fa.hi E.abd El-Sa.ie Fa.ulty of Electronic Engineering Menoufia University Depta.tment of Electrica. Engineering a.d Electronics University of Liverpool

The ma.n objective of multiuser orthogona. frequency division multiple a.cess(MU-OFDM) is to ma.imize the tota. system ca.a.ity in wireless communica.ion systems. Thus, the problem in MU-OFDM system is the a.a.tive a.loca.ion of the resources(subca.riers, bits a.d power) to different users subject to severa. restrictions to ma.imize the tota. system ca.a.ity. In this work, a.proposed subca.rier a.loca.ion a.gorithm wa. presented to a.sign the subca.riers with highest cha.nel ga.n to the users. a.ter the subca.rier a.loca.ion, subca.rier ga.n-ba.ed power a.loca.ion(SGPa. wa. employed for power a.d bit loa.ing. The simula.ion results show tha. the proposed subca.rier-power a.loca.ion scheme ca. a.hieve high tota. system ca.a.ity a.d good fa.rness in a.loca.ing the resources to the users with slightly high computa.iona. complexity compa.ed to the existing subca.rier a.loca.ion a.gorithms.

关键词： multiuser orthogona. frequency division multiple a.cess (MU-OFDM) subca.rier-a.loca.ion power a.loca.ion fa.rness ca.a.ity

Fra.tiona. Optima. Control of Na.ier-Stokes Equa.ions

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Computers, Ma.eria.s & Continua 2020年第8期64卷 859-870页

作者： abd-a.la. Hyder M.El-Ba.a.y King Kha.id University College of ScienceDepartment of MathematicsP.O.Box 900461413AbhaSaudi Arabia Depa.tment of Engineering Ma.hema.ics a.d Physics Faculty of EngineeringAl-Azhar UniversityCairo11371Egypt Ma.hema.ics Depa.tment Al-Azhar UniversityCairoEgypt

In this pa.er,the non-sta.iona.y incompressible fluid flows governed by the Na.ier-Stokes equa.ions a.e studied in a.bounded *** study focuses on the time-fra.tiona. Na.ier-Stokes equa.ions in the optima. control subject,where the control is distributed within the doma.n a.d the time-fra.tiona. deriva.ive is proposed a. Riema.n-Liouville *** a.dition,the control object is to minimize the qua.ra.ic cost *** using the La.-Milgra. lemma.with the a.sista.ce of the fixed-point theorem,we demonstra.e the existence a.d uniqueness of the wea. solution to this ***,for a.qua.ra.ic cost functiona. subject to the time-fra.tiona. Na.ier-Stokes equa.ions,we prove the existence a.d uniqueness of optima. ***,via.the va.ia.iona. inequa.ity upon introducing the a.joint linea.ized system,some inequa.ities a.d identities a.e given to gua.a.tee the first-order necessa.y optima.ity conditions.a.direct consequence of the results obta.ned here is tha. when a.1,the obta.ned results a.e va.id for the cla.sica. optima. control of systems governed by the Na.ier-Stokes equa.ions.

关键词： Optima. control la.-milgra. lemma fixed point theorem na.ier-stokes equa.ions

Spa.io-tempora. va.ia.ion of zoopla.kton community structure in tropica. urba. wa.erbodies a.ong trophic a.d urba. gra.ients

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Ecologica. Processes 2019年第1期8卷 539-550页

作者： Siti Ba.qis abd.Ra.a. Za.i Sha.ip La.e Resea.ch Unit Water Quality and Environment Research CentreNational Hydraulic Research Institute of MalaysiaMinistry of WaterLand and Natural ResourcesLot 5377Jalan Putra Permai43300 Seri KembanganSelangorMalaysia

The ecologica. impa.ts of urba.iza.ion a.d eutrophica.ion on zoopla.kton communities in urba. wa.erbodies ha.e recently ga.ned wide *** findings va.y a.ross species a.d urba. *** the development of such cha.ges a.fects the va.ia.ion of biotic a.sembla.es ha. only been explored to a.limited extent in tropica. urba. *** a.d tempora. va.ia.ions of zoopla.kton community structure in 11 urba. wa.erbodies in the Kla.g Va.ley,Ma.a.sia.were investiga.ed a.ong trophic a.d urba.iza.ion *** a.d wa.er qua.ity sa.ples were collected three times,between Ma. a.d November 2017,from two different loca.ions in ea.h *** three ma.n zoopla.kton groups(rotifera.copepoda.a.d cla.ocera.were recorded from the study a.ea. throughout the sa.pling *** zoopla.kton community structure,pa.ticula.ly with rega.d to rotifers a.d cla.ocera.s,va.ied between la.es a.d *** diversity does not va.y with la.e size or dista.ce from the city center but does va.y with shoreline development index a.d urba.iza.ion *** zoopla.kton popula.ions were domina.ed by rotifers,ma.nly Bra.hionus a.gula.is a. a.l study sites during the study period followed by copepods a.d *** tota. density of zoopla.kton wa. significa.tly highest(pa.es a.d during the dry *** diversity a.d rotifer species richness were nega.ively correla.ed with tota. phosphorus(TP).Diversity increa.ed with urba.iza.ion a.d shoreline development,with rotifers a. a.potentia. bioindica.or of trophic sta.e in urba. tropica. la.es,due to their close rela.ionship with TP.

关键词： Eutrophica.ion Rotifer Tropica. ponds Urba. wa.erbodies Zoopla.kton diversity

Entropy Genera.ion for Flow a.d Hea. Tra.sfer of Sisko-Fluid Over a. Exponentia.ly Stretching Surfa.e

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Computers, Ma.eria.s & Continua 2020年第1期62卷 37-59页

In the present study,the effects of the ma.netic field on the entropy genera.ion during fluid flow a.d hea. tra.sfer of a.Sisko-fluid over a. exponentia.ly stretching surfa.e a.e *** simila.ity tra.sforma.ions a.e used to tra.sfer the governing pa.tia. differentia. equa.ions into a.set of nonlinea.-coupled ordina.y differentia. ***-Kutta.Fehlberg method is used to solve the governing *** effects of ma.netic field pa.a.eter,loca. slip pa.a.eterλ,genera.ized Biot numberγ,Sisko fluid ma.eria. pa.a.eter,Eckert number Ec,Pra.dtl number Pr a.d Brinkma. number Br a. two va.ues of power la. index on the velocity,tempera.ure,loca. entropy genera.ion number N_(G) a.d Beja. number Be a.e ***,the ta.ula. forms for loca. skin friction coefficient a.d loca. Nusselt number under the effects of the physica. pa.a.eters a.e *** current results a.e helpful in checking the entropy genera.ion for *** is found tha.,a. extra.ma.netic field pa.a.eter ma.es higher Lorentz force tha. suppresses the *** shea. thinning fluids(na.ure domina.es a.d the velocity *** entropy genera.ion number is more for la.ger genera.ized Biot number,ma.netic field pa.a.eter a.d Brinkma. *** loca. skin friction coefficient increa.es a. ma.netic field pa.a.eter a.d ma.eria. pa.a.eter a.e increa.e a.d it decrea.es a. loca. slip pa.a.eter *** loca. Nusselt number decrea.es a. ma.netic field pa.a.eter,loca. slip pa.a.eter a.d Eckert number a.e increa.e,while it increa.es a. ma.eria. pa.a.eter,genera.ized Biot number a.d Pra.dtl number a.e increa.e.

关键词： Bounda.y la.er entropy genera.ion exponentia.ly stretching surfa.e ma.netic field sisko-fluid