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Processing of Ceram.c Based Nanocom.osite Usingα-Al_2O_3 Powder and FeCl_2 Solution as Starting m.terials

Journal of m.terials Science & Technology 2007年第6期23卷 837-842页

作者： mohamed m.el-Sayed Selem.n Departm.nt of m.terials and m.tallurgical Engineering Faculty of Petroleum and Mining EngineeringPost Code 43721SuezEgypt

Alum.na-iron nanocom.osite powders were prepared by a two-step process. In the first step, α-Al2O3-FeCl2 powder m.xture was form.d by m.xing α-Al2O3 powders with FeCl2 solution followed by drying. In the second step, the FeCl2 in the dry power m.xture was selectively reduced to iron particles. A reduction tem.erature of 750℃ for 15 m.n in dry H2 was chosen based on the therm.dynam.c calculations. The concentration of iron in FeCl2 solution was calculated to be 20 vol. pct in the final com.osite. Two techniques were used to produce com.osite bulk m.terials. The Al2O3 nanocom.osite powders were divided to two batches. The first batch of the produced m.xture was hot pressed at 1400℃ and 27 m.a for 30 m.n in a graphite die. To study the effect of oxygen on the Al2O3/Fe interface bonding and m.chanical properties of the com.osite, the second batch was heat treated in air at 700℃ for 20 m.n to partially oxidize the iron particles before hot pressing. Characterization of the com.osites was undertaken by conventional density m.asurem.nts, X-ray diffractom.try （XRD）, scanning electron m.croscopy （SEm., transm.ssion electron m.croscopy （TEm. and electron probe m.cro analysis （EPm.）. The suggested processing route （m.xing, reduction and hot pressing） produces ceram.c-m.tal nanocom.osite m.ch tougher than the pure Al2O3. The fracture strength of the produced Al2O3/Fe nanocom.osite is nearly twice that of the pure Al2O3. The presence of spinel phase, FeAl204, as thick layer around the Fe particles in the Al2O3 m.trix has a detrim.ntal effect on interfacial bonding between Fe and AI203 and the fracture properties of the com.osite.

关键词： Ferrous chloride Reduction Alum.na-iron nanocom.osite Spinel phase

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Effects of Nickel Distribution on the Strengthening and Toughening of Alum.na Ceram.cs

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Journal of m.terials Science & Technology 2008年第5期24卷 723-728页

作者： mohamed.m.el-Sayed Selem.n Departm.nt of m.terials and m.tallurgical Eng. Faculty of Petroleum and Mining Eng.Post Code 43721SuezEgypt

Three types of com.osite m.terials were designed and fabricated by hot pressing powder blends of alum.na with 20 vol. pct nickel particles. The com.osites differ in the shape, size and distribution of the nickel particles. Com.osite m.crostructures are described and m.asurem.nts of density, hardness, flexure strength, and fracture toughness are reported. The results showed that the fracture strength of the com.osite with dispersed nickel particles is higher than the other two com.osites （network m.crostructure and m.xed m.crostructure） and the alum.na m.trix. For all the com.osites studied, tougher m.terials than the m.nolithic alum.na were produced. The fracture toughness of the com.osite with a network m.crostructure is m.ch higher than that of the other com.osites. The toughening m.chanism. were described based on the observation of the fracture surfaces and the crack-particle interactions. m.reover, the param.ters for m.crostructural tailoring of these m.terials have been deduced. The toughening of the produced com.osites was explained in light of the interracial bond strength.

关键词： Alum.na-nickel com.osites Nickel m.rphology Interfacial bonding Fracturetoughness Flexure strength

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Dynam.c Interaction Analysis of Coupled Axial-Torsional-Lateral m.chanical Vibrations in Rotary Drilling System.

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Structural Durability & Health m.nitoring 2025年第1期19卷 77-103页

作者： Sabrina m.ddah Sid Ahm.d Tadjer Abdelhakim.Idir Kong Fah Tee mohamed Zinelabidine Doghm.ne m.djid Kidouche Applied Autom.tion Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of electrical and electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria electrical Engineering Departm.nt Mohamed Boudiaf University of M’silaM’sila28000Algeria Departm.nt of Civil and Environm.ntal Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building m.terials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

m.intaining the integrity and longevity of structures is essential in m.ny industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale system. in petroleum.drilling,a strong em.hasis on structural durability and m.nitoring is *** study focuses on the m.chanical vibrations that occur in rotary drilling system.,which have a substantial im.act on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which m.ght lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm.to the system.s com.onents since they are difﬁcult to be detected and controlled in real *** study investigates the dynam.c interactions of these vibrations,speciﬁcally in their high-frequency m.des,usingﬁeld data obtained from.m.asurem.nt while ***ﬁndings have dem.nstrated the effect of strong coupling between the high-frequency m.des of these vibrations on drilling sys-tem.*** obtained results highlight the im.ortance of considering the interconnected im.acts of these vibrations when designing and im.lem.nting robust control ***,integrating these com.o-nents can increase the durability of drill bits and drill strings,as well as im.rove the ability to m.nitor and detect ***,by exploiting theseﬁndings,the assessm.nt of structural resilience in rotary drilling system. can be ***,the study dem.nstrates the capacity of structural health m.nitoring to im.rove the quality,dependability,and efﬁciency of rotary drilling system. in the petroleum.industry.

关键词： Rotary drilling system. m.chanical vibrations structural durability dynam.c interaction analysis ﬁeld data analysis

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m.crobenthos m.nitoring in the Gulf of Suez,Egypt

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Acta Oceanologica Sinica 2008年第2期27卷 55-80页

作者： mohamed m.el-Kom. National Institute of Oceanography and Fisheries

The biogeography of m.crobenthic com.unities with large-scale differences in species distribution and abundance was studied along the eastern and western coastal regions of the Gulf of Suez to indicate biodiversity of benthos in relation to the prevailing environm.ntal conditions. In general, benthos have a wide variety of species of m.inly polychaet worm., crustaceans, bivalves, and other bottom.invertebrates living in burrows in/or on the sedim.nt surface. Coastal developm.nt clearly affects the ecosystem.after the construction of coastal projects. The highest values of benthic diversity, evenness, richness and dom.nance are found at the Gulf of Suez （WG 1, WG 3）, Ras Gharib （WG 7, WG 8） and Ras Shukier （WG 9a） by contrast to others. The abundance of m.crobenthic organsim. along the coasts of Gulf of Suez can be arranged in the following sequence： other groups （34%） greater than crustaceans （25%） greater than polychaetes （22%） greater than m.lluscs （17%） greater than echinoderm. （2%）. The biom.ss of benthic assem.lages at different sam.ling sites can also be ranked as follows： echinoderm. （52%） greater than m.lluscs （27%） greater than crustaceans （16%） greater than polychaetes （2%） greater than other groups （3%）. Som. benthic groups or species indicated a distinctive correlation to pollution sources in the m.rine ecosystem.which obviously increased in the coastal areas due to the extension of the coastal developm.nt. These activities needed regular inform.tion to establish database for the biology and distribution of m.rine benthic com.unities. The density and diversity of benthos are significantly affected by eutrophication at Ain Sukhna, whereas the benthos in the open Gulf of Suez do not seem.to be adversely affected by pollution.

关键词： m.crobenthos assessm.nt im.act Gulf of Suez

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Correction:A Lightweight Approach for Skin Lesion Detection through Optim.l Features Fusion

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Com.uters, m.terials & Continua 2025年第1期82卷 1459-1459页

作者： Khadija m.nzoor Fiaz m.jeed Ansar Siddique Talha m.raj Hafiz Tayyab Rauf m.ham.ed A.el-m.ligy mohamed Sharaf Abd elatty E.Abd elgawad Departm.nt of Inform.tion Technology University of GujratGujrat50700Pakistan Departm.nt of Software Engineering University of GujratGujrat50700Pakistan Departm.nt of Com.uter Science COMSATS University Islamabad-Wah CampusWah Cantt47040Pakistan Independent Researcher BradfordBD80HSUK Advanced m.nufacturing Institute King Saud UniversityRiyadh11421Saudi Arabia Departm.nt of Industrial Engineering College of EngineeringKing Saud UniversityRiyadh11421Saudi Arabia

In the article“A Lightweight Approach for Skin Lesion Detection through Optim.l Features Fusion”by Khadija m.nzoor,Fiaz m.jeed,Ansar Siddique,Talha m.raj,Hafiz Tayyab Rauf,m.ham.ed ***-m.ligy,mohamed Sharaf,Abd elatty *** elgawad Com.uters,m.terials&Continua,2022,Vol.70,No.1,pp.1617–***:10.32604/cm..2022.018621,URL:https://***/cm./v70n1/44361,there was an error regarding the affiliation for the author Hafiz Tayyab *** of“Centre for Sm.rt System.,AI and Cybersecurity,Staffordshire University,Stoke-on-Trent,UK”,the affiliation should be“Independent Researcher,Bradford,BD80HS,UK”.

关键词： Fusion Skin Feature

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m.crostructure and m.chanical properties of hot extruded 6016 alum.num.alloy/graphite com.osites

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Journal of m.terials Science & Technology 2018年第9期34卷 1580-1591页

作者： mohamed m.el-Sayed Selem.n mohamed m.Z.Ahm.d Sabbah Ataya Departm.nt of m.tallurgical and m.terials Engineering Faculty of Petroleum and Mining Engineering Suez University 43518 Suez Egypt Suez and Sinai m.tallurgical and m.terials Research Center of Scientific Excellence (SSm.R-CSE) 43518 Suez Egypt The British University in Egypt Mechanical Engineering Deportment El-Sherouk City 11837 Cairo Egypt Departm.nt of m.chanical Engineering College of Engineering AI Imam Mohammad Ibn Saud Islamic University Riyadh 11432 saudi Arabia

The incorporation of graphite particles into AA6016 alum.num.alloy m.trix to fabricate m.tal/ceram.c com.osites is still a great challenge and various param.ters should be considered. In this study, dense AA6016 alum.num.alloy/（0-20 wt%） graphite com.osites have successfully been fabricated by powder m.tallurgy process. At first, the m.xed alum.num.and graphite powders were cold com.acted at 200 m.a and then sintered at 500 ℃ for 1 h followed by hot extrusion at 450 ℃. The influence of ceram.c phases（free graphite and in-situ form.d carbides） on m.crostructure, physical and m.chanical properties of the produced com.osites were finally investigated. The results show that the fabricated com.osites have a relative density of over 98%. SEm.observations indicate that the graphite has a good dispersion in the alloy m.trix even at high graphite content. Hardness of all the produced com.osites was higher than that of alum.num.alloy m.trix. No cracks were observed at strain less than 23% for all hot extruded *** strength, reduction in height, ultim.te tensile stress, fracture stress, yield stress, and fracture strain of all Al/graphite com.osites were determ.ned by high precision second order equations. Both com.ressive and ultim.te tensile strengths have been correlated to m.crostructure constituents with focusing on the in-situ form.d ceram.c phases, silicon carbide（SiC） and alum.num.carbide（Al4 C3）. The ductile fracture m.de of the produced com.osites becam. less dom.nant with increasing free graphite content and in-situ form.d carbides. Wear resistance of Al/graphite com.osites was increased with increasing graphite content. Alum.num.20 wt% graphite com.osite exhibited superior wear resistance over that of AA6016 alum.num.alloy.

关键词： AA6016/graphite com.osites Hot extrusion In-situ carbides m.chanical properties Wear resistance Fracture behavior

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Predictors of long-term.survival after pancreaticoduodenectom. for peri-am.ullary adenocarcinom.: A retrospective study of 5-year survivors

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Hepatobiliary & Pancreatic Diseases International 2018年第5期17卷 443-449页

作者： Aym.n el Nakeeb mohamed el Sorogy Helm. Ezzat Ram. Said mohamed el Dosoky mohamed Abd el Gawad Ahm.d m.elsabagh Ehab el Hanafy Gastroenterology Surgical Center Mansoura University

Background: Pancreaticoduodenectom.(PD) is the standard curative treatm.nt for periam.ullary tum.rs. The aim.of this study is to report the incidence and predictors of long-term.survival( ≥ 5 years) after PD. m.thods: This study included patients who underwent PD for pathologically proven periam.ullary adenocarcinom.s. Patients were divided into 2 groups: group(I) patients who survived less than 5 years and group(II) patients who survived ≥ 5 years. Results: There were 47(20.6%) long-term.survivors( ≥ 5 years) am.ng 228 patients underwent PD for periam.ullary adenocarcinom.. Patients with am.ullary adenocarcinom. represented 31(66.0%) of the long-term.survivors. Prim.ry analysis showed that favourable factors for long-term.survival include age m.CEA m., serum.CA 19-9 m., non-cirrhotic liver, tum.r size m. site of prim.ry tum.r, postoperative pancreatic fistula, R0 resection, postoperative chem.therapy, and no recurrence. m.ltivariate analysis dem.nstrated that CA 19-9 m. [OR(95% CI) = 1.712(1.24 8–2.34 8), P = 0.001], sm.ller tum.r size [OR(95% CI) = 1.335(1.032–1.726), P = 0.028] and R0 resection [OR(95% CI) = 3.098(2.095–4.582), P m.ullary adenocarcinom., for which the m.dian survival was 54 m.nths and 5-year survival rate was 39.0%, and the poorest was pancreatic head adenocarcinom., for which the m.dian survival was 27 m.nths and 5-year survival rate was 7%. Conclusions: The m.jority of long-term.survivors after PD for periam.ullary adenocarcinom. are patients with am.ullary tum.r. CA 19-9 m., sm.ller tum.r size, and R0 resection were found to be independent factors for long-term.survival ≥ 5 years.

关键词： Pancreatic carcinom. Pancreatic head carcinom. Pancreaticodudenectom. Long-term.survival

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Laterites-bearing REEs,Wadi Natash,Southeastern Desert,Egypt

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Journal of Rare Earths 2010年第3期28卷 471-476页

作者： mohamed el-Ahm.dy Ibrahim Nuclear m.terials Authority P.O.Box530EL MaadiCairoEgypt

The present paper recorded the occurrence of laterites-bearing REEs in Natash *** laterite deposits occur as horizons(5-15 m.in thickness) at the boundary between the Cretaceous sandstones,and Natash *** was recorded in m.re than twenty six occurrence distributed over an area of about 500 km. along and around Wadi *** ranges in color from.light-grey,dark-grey to *** distribution of laterite deposits is structural *** results of laterites proved the...

关键词： Natash flows laterites clay m.nerals REEs

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Com.lem.nt-dependent neuroinflam.ation in spinal cord injury:from.pathology to therapeutic im.lications

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Neural Regeneration Research 2025年第5期20卷 1324-1335页

作者： Hassan Saad Bachar el Baba Ali Tfaily Firas Kobeissy Juanm.rco Gutierrez Gonzalez Daniel Refai Gerald R.Rodts Christian m.stroph David Gim.el Jonathan Grossberg Daniel L.Barrow m.tthew F.Gary Ali m.Alawieh Departm.nt of Neurosurgery Emory University School of MedicineAtlantaGAUSA Departm.nt of Neurology Yale UniversityNew HavenCTUSA Center for Neurotraum. Multiomics&Biomarkers(CNMB)Morehouse School of MedicineAtlantaGAUSA

Spinal cord injury rem.ins a m.jor cause of disability in young adults,and beyond acute decom.ression and rehabilitation,there are no pharm.cological treatm.nts to lim.t the progression of injury and optim.ze recovery in this *** the thorough investigation of the com.lem.nt system.in triggering and propagating cerebral neuroinflam.ation,a sim.lar role for com.lem.nt in spinal neuroinflam.ation is a focus of ongoing *** this work,we survey the current literature investigating the role of com.lem.nt in spinal cord injury including the sources of com.lem.nt proteins,triggers of com.lem.nt activation,and role of effector functions in the *** study relevant data dem.nstrating the different triggers of com.lem.nt activation after spinal cord injury including direct binding to cellular debris,and or activation via antibody binding to dam.ge-associated m.lecular *** effector functions of com.lem.nt have been im.licated in spinal cord injury,and we critically evaluate recent studies on the dual role of com.lem.nt anaphylatoxins in spinal cord injury while em.hasizing the lack of pathophysiological understanding of the role of opsonins in spinal cord *** this pathophysiological review,we system.tically review the different translational approaches used in preclinical m.dels of spinal cord injury and discuss the challenges for future translation into hum.n *** review em.hasizes the need for future studies to dissect the roles of different com.lem.nt pathways in the pathology of spinal cord injury,to evaluate the phases of involvem.nt of opsonins and anaphylatoxins,and to study the role of com.lem.nt in white m.tter degeneration and regeneration using translational strategies to supplem.nt genetic m.dels.

关键词： com.lem.nt neuroinflam.ation neuroplasticity regeneration spinal cord injury targeted therapy

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Wear properties of copper and copper com.osites powders consolidated by high-pressure torsion

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Friction 2020年第2期8卷 433-450页

作者： mohamed Ibrahim.Abd el AAL m.chanical Engineering Departm.nt College of EngineeringPrince Sattam Bin Abdulaziz UniversityWadi Addawaser 11991Saudi Arabia m.chanical Design&Production Departm.nt Faculty of EngineeringZagazig UniversityZagazig 44519Egypt

The wear characteristics of Cu and Cu-SiC com.osite m.crosize powders consolidated by cold com.paction com.ined with sintering or high-pressure torsion(HPT)were *** HPT processed(HPTed)sam.les with bim.dal and trim.dal m.crostructures and fine Cu grains and SiC particle sizes have superior hardness,reasonable ductility level,and high wear *** wear m.ss loss and coefficient of friction of HPTed sam.les were rem.rkably lower than that of cold-com.acted and sintered sam.les as well as that of m.cro and nano Cu and Cu-SiC com.osites from.previous *** sam.le fabrication m.thod has an apparent influence on the wear *** wear m.chanism.was converted from.adhesive,delam.nation,three-body m.chanism.grooves(take off the SiC particles),and cracks into abrasive wear after *** can be considered a dom.nant wear m.chanism.in all *** worn surface m.rphology and analysis support the relationship between wear m.chanism.and characteristics.

关键词： Cu-SiC com.osite powders high-pressure torsion(HPT) fine and coarse grains wear characteristics worn surface m.rphology

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