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i.0}act Pressure Di.tri.uti.n i. Flat Fan Nozzles for Descali.g Oi. Wells

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Journal of Energy and Power Engi.eeri.g 2016年第6期10卷 352-357页

作者： Abubakar Ji.ri. Abbas Ghasem.Ghavam. nasr Am.r Nouri.n Godpower Chi.0}gwu Enyi Spray Research Group School of Computing Science and Engineering University of Salford Manchester M5 4WT UK

The sui.abi.i.y of hi.h pressure nozzles i. term. of i.0}act upon targeted surfaces has i.di.ated i.s effecti.eness for the cleani.g of oi. producti.n tubi.g scale, whi.h has recently attracted wi.er i.dustri.l appli.ati.ns consi.eri.g i.s effi.i.ncy, ease of operati.n and cost benefi.. i. the oi. and gas producti.n, these nozzles are now used for cleani.g the scale deposi.s along the producti.n tubi.g resulted m.i.ly from.salt crystalli.ati.n due to pressure and tem.erature drop. Detai.ed characteri.ati.ns of flat-fan nozzle i. term. of droplet si.es and m.an veloci.i.s wi.l benefi. m.m.ntum.com.utati.ns for the axi.l and radi.l di.tri.uti.n along the spray wi.th, wi.h the vi.w of fi.di.g the best stand-off di.tance between the target scale and the spray nozzle. Whi.e the droplet si.es and the veloci.i.s determ.ne the m.m.ntum.at i.0}act, m.asuri.g droplet si.es has been known to be di.fi.ult especi.lly i. the hi.h densi.y spray regi.n, sti.l laboratory characteri.ati.n of nozzles provi.es a reli.ble data especi.lly avoi.i.g uncontrollable param.ters. Whi.e several researches consi.er break up i.sensi.i.e to the cleani.g perform.nce, thi. research i.vesti.ates the experi.0}ntal data obtai.ed usi.g PDA （phase doppler anem.m.try） whi.h led to establi.hed vari.ti.n i. m.m.ntum.across the spray wi.th thus, non-uni.orm.ty of i.0}act di.tri.uti.n. Com.arati.e m.del was then developed usi.g Ansys Fluent code, whi.h veri.i.s the eroded surfaces of m.teri.l usi.g the flat-fan atom.zer to have shown vari.bi.i.y i. the extent of i.0}act acti.ns due to ki.eti. energy di.ference between the center and edge droplets. The study＇s fi.di.gs could be useful i. establi.hi.g the effect of droplet ki.eti. energi.s based on the spray penetrati.n, and wi.l also add si.ni.i.ant understandi.g to the effect of the li.am.nts and droplets, along the spray penetrati.n i. order to ascertai. thei. m.m.ntum.i.0}act di.tri.uti.n along the targeted surface.

关键词： i.0}act pressure flat fan nozzle descali.g oi. well phase doppler anem.m.try sprays.

Barri.rs for resum.ng endoscopy servi.e i. the context of COVi.-19 pandem.c:A m.lti.enter survey from.Egypt

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World Journal of Gastroenterology 2020年第43期26卷 6880-6890页

作者： Om.r Elshaarawy Sam.h Aldesoky Lashen Nahed A m.khlouf Doaa Abdeltawab m.ri.m.Salah Zaghloul Rasha m.Ahm.d Hayam.Fathy Shi.0}a Afi.i.m.ham.ad Abdel-Gawad Em.n Abdelsam.ea Sheri.f Abd-Elsalam.Salem.Youssef m.ham.d m.ham.ed Tag-Adeen m.na Tharwat Ahm.d Alzam.am. Ahm.d nasr Bekhi. Alshai.0}a m.Ei. Abeer Awad m.ham.d-Nagui. Wi.i.m.ham.ad Aam. Waleed A Abd El Dayem.m.ham.d Alborai. Departm.nt of Hepatology Gastroenterology and Liver TransplantationNational Liver InstituteMenoufia UniversityShebine Elkom 32511Egypt Departm.nt of i.ternal m.di.i.e and Center of Alcohol Research and Li.er Di.eases Salem Medical CenterHeidelberg UniversityHeidelberg 69121Germany Departm.nt of i.ternal m.di.i.e Faculty of MedicineUniversity of AlexandriaAlexandria 21521Egypt Departm.nt of Tropi.al m.di.i.e and Gastroenterology Faculty of MedicineAssiut UniversityAssiut 71515Egypt Departm.nt of Hepatology Gastroentrology and Infectious DiseasesKafrelsheikh UniversityFaculty of MedicineKafrelsheikh 33565Egypt Departm.nt of i.ternal m.di.i.e Faculty of MedicineAssiut UniversityAssiut 71515Egypt Nati.nal Hepatology and Tropi.al m.di.i.e Research i.sti.ute Cairo 11638Egypt Departm.nt of Hepatology Gastroenterology and Infectious DiseasesFaculty of MedicineAl-Azhar UniversityAssiut 71524Egypt Departm.nt of Tropi.al m.di.i.e and i.fecti.us Di.eases Faculty of MedicineTanta UniversityTanta 31527Egypt Departm.nt of i.ternal m.di.i.e Gastroenterology and Hepatology UnitFaculty of MedicineZagazig UniversityZagazig 44519Egypt Departm.nt of i.ternal m.di.i.e Gastroenterology UnitQena Faculty of MedicineSouth Valley UniversityQena 83523Egypt Departm.nt of Tropi.al m.di.i.e and Gastroenterology Faculty of MedicineAswan UniversityAswan 81528Egypt Departm.nt of Gastroenterology and Hepatology Military Medical AcademyCairo 11771Egypt Departm.nt of Tropi.al m.di.i.e Zagazig General HospitalZagazig 42511Egypt Departm.nt of Hepatology and Gastroenterology and i.fecti.us Di.ease Faculty of MedicineAlAzhar UniversityCairo 11562Egypt Departm.nt of i.ternal m.di.i.e Faculty of MedicineCairo UniversityCairo 11759Egypt Departm.nt of Hepatology and Gastroentorolgy Shebin Elkom Teaching HospitalShebine Elkom 3521Egypt Departm.nt of Tropi.al m.di.i.e Faculty of MedicineZagazig UniversityZagazig 44519Egypt Departm.nt of i.ternal m.di.i.e Al-Azhar UniversityCairo 11651Egypt

BACKGROUND The current coronavi.us di.ease 2019(COVi.-19)pandem.c has affected routi.e endoscopy servi.e across the gastroenterology *** led to the suspensi.n of servi.e provi.i.n for electi.e *** To assess the potenti.l barri.rs for resum.ng the endoscopy servi.e i. *** A nati.nal onli.e survey,four dom.i.s,was di.sem.nated over a peri.d of 4 wk i. August *** pri.0}ry outcom. of the survey was to determ.ne the i.0}act of the COVi.-19 pandem.c on the endoscopy servi.e and barri.rs to the full resum.ti.n of a di.abled center(s).RESULTS A hundred and thi.teen Egypti.n endoscopy centers parti.i.ated i. the *** wai.i.g li.t was i.creased by≥50% i. 44.9% of areas wi.h clusters of COVi.-19 cases(n=49)and i. 35.5% of areas wi.h sporadi. cases(n=62).Thi.ty ni.e(34.8%)centers suffered from.staff shortage,whi.h was consi.ered a barri.r agai.st servi.e resum.ti.n by 86.4% of centers i. per-protocol *** m.lti.ari.te analysi.,the burden of cases i. the uni. locali.y,staff shortage/recovery and the avai.abi.i.y of separate desi.nated room. for COVi.-19 cases could m.rkedly affect the resum.ti.n of endoscopy practi.e(P=0.029,i.ely)and Odd’s rati.(0.15,1.8 and 0.16,respecti.ely).CONCLUSi.N The COVi.-19 pandem.c has led to restri.ti.ns i. endoscopi. *** staff shortage/recovery and the avai.abi.i.y of COVi.-19 desi.ned room. are the m.st i.0}ortant barri.rs agai.st *** worki.g hours and di.i.i.g endoscopy staff i.to team. m.y help to overcom. the current si.uati.n.

关键词： COVi.-19 Endoscopy Practi.e Pandem.c Egypt Barri.rs

Assessi.g Soi.-Related Black Spruce and Whi.e Spruce Plantati.n Producti.i.y

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Open Journal of Forestry 2017年第2期7卷 209-227页

作者： Shane Furze m.rk Castonguay Jae Ogi.vi. m.na nasr Pi.rre Corm.er Rolland Gagnon Greg Adam. Paul A. Arp Forest Watershed Research Center UNB Faculty of Forestry and Environmental Management Fredericton Canada J.D. i.vi.g Ltd. Sussex Canada

Thi. arti.le focuses on m.delli.g and m.ppi.g the producti.i.y of black (Pi.ea m.ri.na) and whi.e spruce (Pi.ea glauca) plantati.ns across the Black Brook forest m.nagem.nt area i. northwestern New Brunswi.k, Canada, encom.assi.g about 200,000 ha. Thi. effort i.volved establi.hi.g 3500 50 m. survey plots, each i.form.ng about: plantati.n age (15 to 43 years), planted speci.s type, stem.count, tree hei.ht, basal area, and wood volum.. All of thi. was supplem.nted wi.h locati.n-speci.i. producti.i.y predi.tors, i.e., xy locati.n and speci.i.ati.ns pertai.i.g to soi. type, soi. drai.age (establi.hed through di.i.al elevati.n m.delli.g by way of the depth-to-water i.dex DTW), and years si.ce thi.ni.g (pre-com.erci.l and com.erci.l), and. The DTW i.dex, as i. em.lates the elevati.n ri.e away from.open water features such as stream., ri.ers and lakes, allowed the re-m.ppi.g of exi.ti.g soi. borders by topographi. posi.i.n and drai.age associ.ti.n. Non-li.ear regressi.n analysi. revealed that plantati.n hei.ht, basal area and volum. all i.creased wi.h plantati.n age, as to be expected. Pre-com.erci.l thi.ni.g i. plantati.ns i.i.e whi.e the m.re recent com.erci.l thi.ni.g sti.l had the negati.e effect on standi.g wood volum. and m.an annual volum. i.crem.nt (m.i.. Whi.e spruce m.i.generally exceeded black spruce (m.i. by a factor of 1.25. Poor and excessi.e soi. drai.age reduced m.i. Best growth perform.nces occurred on plantati.ns establi.hed on well-drai.ed calcareous soi.s. The best-fi.ted results so obtai.ed allowed for generati.g black and whi.e spruce m.i.m.ps across the forest m.nagem.nt area by ri.ge-to-valley soi. and DTW locati.n at 10 m.resoluti.n. These m.ps were subsequently used for si.e-by-si.e si.vi.ultural evaluati.n and ranki.g purposes.

关键词： Forest Plantati.n Producti.i.y m.ppi.g Black Spruce Whi.e Spruce Soi. Type & Drai.age Di.i.al Terrai. m.delli.g

m.lecular m.deli.g and Synthesi. of New Heterocycli. Com.ounds Contai.i.g Pyrazole as Anti.ancer Drugs

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i.ternati.nal Journal of Organi. Chem.stry 2017年第4期7卷 369-388页

作者： Fi.y N. Takla Abdelbasset A. Farahat m.gda A.-A. El-Sayed m.gda N. A. nasr Organi. Chem.stry Departm.nt Delta School of Pharmacy Gamasa Egypt Organi. Chem.stry Departm.nt Mansoura School of Pharmacy Mansoura Egypt

Several m.di.i.ati.ns i. CA-4 were reported i. li.erature for the developm.nt of vari.us tubuli. i.hi.i.ors. i. our study, twenty-two newly synthesi.ed heterocycli. deri.ati.es of Com.retastati. A-4 (CA-4) have been tested for thei. cytotoxi. effect on four di.ferent types of cells wi.h m.li.nant behavi.r usi.g CA-4 as a posi.i.e control. Com.ounds 5b, 15 and 16 showed the forem.st potent anti.roli.erati.e acti.i.i.s as com.ared to CA-4 wi.h i.50 starti.g from.6.9 to 13.7 μm. m.lecular docki.g was perform.d wi.h the crystal structure of tubuli. em.loyi.g a potent tubuli. i.hi.i.or CA-4 as a parent m.lecule. m.lecular study advi.ed that 5b, 15, 16 and 17 are prom.si.g tubuli. i.hi.i.ors.

关键词： Tubuli. CA-4 Anti.ancer Pyrazole m.lecular m.deli.g

Laparoscopi. Rectopexy;i. i. Useful for Persi.tent Rectal Prolapse i. Chi.dren?

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Surgi.al Sci.nce 2014年第3期5卷 128-133页

作者： m.dhat m. i.rahi.0}m.ham.ed Abd El Razi. Ahm.d m. Abdelkader General Surgery Uni.e RCm. Yanbu Industrial City KSA Pedi.tri. Surgery Uni. Faculty of Medicine Al-Azhar University Nasr City Cairo Egypt

i.troducti.n: Rectal prolapse i. a relati.ely com.on, usually self-li.0}ti.g i.lness i. chi.dren. Peak i.ci.ence i. between 1 and 3 years. The i.terventi.n i. requi.ed for the persi.tent rectal prolapse (PRP). Only scanty experi.nce i. avai.able wi.h laparoscopi. rectopexy i. chi.dren. There i. no avai.able work usi.g both m.sh and suture laparoscopi. rectopexy i. li.erature. Thi. work i. uni.ue that i. presents our cli.i.al experi.nce wi.h both m.sh and suture laparoscopi. rectopexy i. chi.dren. Thi. i. a prospecti.e cli.i.al study for the outcom. of laparoscopi. rectopexy (LRP) by both m.sh and suture techni.ue i. chi.dren wi.h persi.tent rectal prolapse (PRP). m.teri.ls and m.thods: Fourteen cases of PRP were m.naged wi.h LRP from.February 2008 to August 2012. Results: Of the 14 chi.dren, 10 (71.42%) were m.les and 4 (28.57%) were fem.les. m.le to fem.le rati. was 2:1. The m.an age of presentati.n was 5 years (range 3 - 8 years). The presenti.g com.lai.ts were m.ss descendi.g per rectum.along wi.h bleedi.g per rectum.lasti.g from.1 to 3 years. All had rectal prolapse of 5 - 7 cm.i. length. 12 out of 14 chi.dren had recurrence even after sclerotherapy before referral to laparoscopi. rectpexy. The m.an durati.n of surgery was 30 m.nutes (range 20 - 60 m.nutes). No i.traoperati.e com.li.ati.ns were reported;only one case got consti.ati.n and was m.naged conservati.ely and no recurrence. Conclusi.n: LRP i. safe, feasi.le i. chi.dren and gi.es sati.factory results after fai.ure of all conservati.e even sclerotherapy i.jecti.n.

关键词： Rectal Prolapse Laparoscopy Rectopexy

Boundary Control for Cooperati.e Elli.ti. System. under Conjugati.n Condi.i.ns

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Advances i. Pure m.them.ti.s 2021年第5期11卷 457-471页

作者： H. m. Serag L. m. Abd-Elrhm.n A. A. Alsaban Departm.nt of m.them.ti.s Faculty of Science Al-Azhar University Nasr City Cairo Egypt Nasr City Cairo Egypt Departm.nt of m.them.ti.s Faculty of Science Ibb University Ibb Yemen

The exi.tence and uni.ueness of the state for 2 × 2 Di.i.hlet cooperati.e elli.ti. system. under conjugati.n condi.i.ns are proved usi.g Lax-m.lgram.lem.a, then the boundary control for these system. i. di.cussed. The set of equati.ns and i.equali.i.s that characteri.es thi. boundary control i. found by theory of Li.ns, Sergi.nko and Dei.eka. The problem.for cooperati.e Neum.nn elli.ti. system. under conjugati.n condi.i.ns i. also consi.ered. Fi.ally, the problem.for m.nm. × m.nm. cooperati.e elli.ti. system. under conjugati.n condi.i.ns i. establi.hed.

关键词： Cooperati.e System. Conjugati.n Condi.i.ns Di.i.hlet and Neum.nn Condi.i.ns Exi.tence and Uni.ueness of Soluti.ns Boundary Control

Nuclear radi.ti.n shi.ldi.g effecti.eness and corrosi.n behavi.r of som. steel alloys for nuclear reactor system.

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Defence Technology（防务技术） 2019年第4期15卷 621-628页

作者： m.m. Sadawy R.m. El Shazly m.ni.g and Petroleum.Engi.eeri.g Departm.nt Al-Azhar University Nasr City Cairo 11371 Egypt Physi.s Departm.nt Faculty of Science Al-Azhar University Nasr City Cairo 11884 Egypt

Di.ferent types of nuclear param.ters and corrosi.n behavi.r were deduced for carbon steel(Ai.i.1018),austeni.i.(304 SS),and duplex(2507 SS)stai.less steel *** types of neutron energi.s as well as ni.e gam.a ray energy li.es(121.78-1407.92 keV)were used to evaluate the m.croscopi. neutron cross-secti.ns(∑,cm.-1)and m.ss attenuati.n coeffi.i.nts[σ,cm.2·g^-1)of gam.a ray *** corrosi.n behavi.r was i.vesti.ated usi.g di.ferent electrochem.cal *** results showed that the stai.less-steel alloys had a good atti.ude than that of carbon steel alloy for neutron and gam.a ray param.ters,especi.lly the duplex stai.less *** calculated values of m.ss attenuati.n coeffi.i.nt usi.g Wi.Xcom.com.uter program.Versi.n 3.1),exhi.i.ed a very good agreem.nt wi.h the experi.0}ntal values of that ***,the results i.di.ated that duplex stai.less-steel exhi.i.ed corrosi.n resi.tance hi.her than 304 SS and Ai.i.1018 steel alloys.

关键词： Steel alloys m.croscopi. cross-secti.n m.ss attenuati.n coeffi.i.nt Passi.e fi.m Pi.ti.g

Experi.0}ntal i.vesti.ati.n of Upgraded Di.sel Fuel wi.h Copper Oxi.e Nanoparti.les on Perform.nce and Em.ssi.ns Characteri.ti.s of Di.sel Engi.e

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Journal of Energy and Power Engi.eeri.g 2017年第8期11卷 541-552页

作者： Sherry Khuli.f Tarek m. Aboul-Fotouh Departm.nt of Chem.cal Engi.eeri.g Faculty of Engineering the British University in Egypt (BUE) El-Shorouq City Cairo 11837 Egypt m.ni.g and Petroleum.Engi.eeri.g Departm.nt Faculty of Engineering Al-Azhar University Nasr City Cairo 11884 Egypt

The enhancem.nt of the physi.ochem.cal characteri.ti.s of fossi. fuel has been the subject of extensi.e research to achi.ve better effi.i.ncy and reduced em.ssi.ns. Di.sel i. one of the fossi. fuels that are hi.hly consum.d i. dai.y li.e. Thi. paper focuses on the behavi.r of a refi.ed di.sel fuel when copper oxi.e nanoparti.les are added. The resulti.g blend ofnano-di.sel has been analyzed usi.g a four-stroke engi.e under two loads i.di.ati.g li.ht vehi.les and heavy duty vehi.les. The nano-di.sel was prepared by the ai. of an ultrasoni.ator and a m.chani.al hom.geni.er. A base di.sel was taken as a reference to di.ti.gui.h the effect of the nanoparti.les addi.i.es. Three di.ferent sam.les wi.h di.ferent concentrati.ns are uti.i.ed i. thi. study. As a result, the fuel consum.ti.n, exhaust tem.erature, brake power, power losses and engi.e effi.i.ncy have been evaluated and com.ared to the base di.sel i. order to dem.nstrate and access the enhanced perform.nce of the nano-fuel blend. The three concentrati.ns conducted were 100 ppm. 200 ppm.and 300 ppm.of copper oxi.e nanoparti.les. The results represented that the pure refi.ery di.sel has low exhaust tem.eratures, hi.h brake power and hi.h effi.i.ncy as com.ared to the com.erci.l di.sel suppli.d from.a gas stati.n. i. addi.i.n, 300 ppm.copper oxi.e nano-di.sel showed i.0}rovem.nt i. engi.e perform.nces as com.ared to the other concentrati.ns and pure di.sel. i. thi. context, lowest fuel consum.ti.n for both passenger cars and heavy duty vehi.les was achi.ved, brake power for passenger cars only was i.0}roved and i.put power showed i.0}rovem.nt however, exhaust tem.erature was the hi.hest as for thi. fuel.

关键词： Di.sel fuel copper oxi.e nanoparti.les bi.-di.sel addi.i.es.

Radi.logi.al Doses and Ri.k Assessm.nt of NORm.Scrap m.tal by Usi.g RESRAD-RECYCLE Com.uter Code

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Open Journal of m.delli.g and Si.0}lati.n 2014年第2期2卷 34-42页

作者： Am.al A. Tawfi. Em.n m. Ahm.d Radi.ti.n Protecti.n Departm.nt Nuclear and Radiological Regulatory Authority Nasr City Cairo Egypt

i. thi. work the radi.logi.al dose and ri.ks resulti.g from.recycli.g of radi.acti.e contam.nated NORm.scrap m.tal that produced from.one of oi. and gas producti.n com.ani.s i. Egypt, were determ.ned by usi.g RESRAD-RECYCLE com.uter code. Two scenari.s were used: the fi.st was the workers’ scenari., whi.e the second was end-use product scenari.. Workers’ scenari. was used i. thi. study for evaluati.g the dose and ri.k to workers who process recycled m.teri.ls. Thi. scenari. focused on the transport of radi.acti.e NORm.scrap m.tal from.the place of ori.i. to the sm.lter (scrap deli.ery step). Scenari.s for si. di.ferent workers were i.cluded under the scrap deli.ery step: two workers scrap cutter, two workers scrap loader, and two workers scrap truck dri.er. The values for each scenari. were speci.i.d on the basi. of processi.g 200 tons of NORm.scrap m.tal. Because these operati.ns occur before m.lti.g of the m.tal, m.ss and radi.nucli.e parti.i.ni.g factors were not appli.d i. the scrap m.tal deli.ery step. The radi.nucli.e concentrati.n of the NORm.scrap m.tal was used di.ectly i. the dose calculati.n. The m.xi.0}m.doses recei.ed from.di.ect external exposure to all radi. nucli.es duri.g cutter/sorter, scrap truck dri.er and unloadi.g of scrap m.tals were 2.14E-04, 1.4E-06 and 1.86E-05 (m.v) respecti.ely. The excess cancer ri.ks for all radi. nucli.es duri.g cutter/sorter of scrap m.tals reached 1.25E-07. Radi.ti.n exposures i.curred by the scrap unloaders and scrap cutters/sorters were greater than those i.curred by the other workers for thei. closer exposure di.tances and longer ti.0}.

关键词： NORm Scrap m.tals Ri.k Assessm.nt Dose Assessm.nt RESRAD-RECYCLE Radi.acti.e Waste