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Influence of tool rotational speed on mechanical and corrosion behaviour of friction stir processed AZ31/Al_(2)O_(3)nanocomposite

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镁合金学报(英文) 2023年第7期11卷 2585-2599页

作者： Ashish Kumar V.P.Singh Akhileshwar Nirala R.C.Singh Rajiv Chaudhary abdel-hamid I.mourad B.K.Sahoo Deepak Kumar Department of Mechanical Engineering Delhi Technological UniversityDelhi 110042India Department of Mechanical Engineering Galgotias College of Engineering and Technology Greater Noida 201310India Department of Mechanical Engineering National Institute of Technology MizoramAizawl 796012India Department of Mechanical Engineering IES College of Technology Bhopal462044India Mechanical and Aerospace Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Materials Engineering Division CSIR-National Metallurgical Laboratory(NML)Jamshedpur831007India Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Nano-sized reinforcements improved the mechanical characteristics efficiently by promoting more implicit particle hardening mechanisms compared to micron-sized ***-sized particles lessen the critical particle solidification velocity for swamp and thus offers better *** the present investigation,the friction stir processing(FSP)is utilized to produce AZ31/Al_(2)O_(3)nanocomposites at various tool rotation speeds(i.e.,900,1200,and 1500 rpm)with an optimized 1.5%volume alumina(Al_(2)O_(3))reinforcement *** mechanical and corrosion behavior of AZ31/Al_(2)O_(3)-developed nanocomposites was investigated and compared with that of the AZ31 base *** AZ31 alloy experienced a comprehensive dynamic recrystallization during FSP,causing substantial grain ***-size strengthening is the primary factor contributed to the enhancement in the strength of the fabricated *** strength and yield strength values were lower than those for the base metal matrix,although an upward trend in both values has been observed with an increase in tool rotation *** 19.72%increase in hardness along with superior corrosion resistance was achieved compared to the base alloy at a tool rotational speed of 1500 *** corrosion currents(Jcorr)of all samples dropped with increase in the rotational speed,in contrast to the corrosion potentials(Ecorr),which *** values of Jcorr of AZ31/Al_(2)O_(3)were 42.3%,56.8%,and 65.5%lower than those of AZ31 alloy at the chosen rotating speeds of 900,1200,and 1500 rpm,*** corrosion behavior of friction stir processed nanocomposites have been addressed in this manuscript which has not been given sufficient attention in the existing ***,this work offers an effective choice for the quality assurance of the FSP process of AZ31/Al_(2)O_(3)*** obtained results are relevant to the development of lightweight automobile and aerospace structures and components

关键词： Friction stir processing AZ31 alloy Al_(2)O_(3) Nanocomposite Mechanical properties Corrosion resistance

Cooling and lubrication techniques in grinding:A state-of-the-art review,applications,and sustainability assessment

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Chinese Journal of Aeronautics 2023年第7期36卷 76-113页

作者： Ahmed Mohamed Mahmoud IBRAHIM Wei LI abdel-hamid ISMAIL mourad Mohamed A.E.OMER Fadl A.ESSA Ahmed Mustafa ABD EL-NABY Mohammad S.Al SOUFI Muhammad F.EZZAT Ammar ElSHEIKH College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Production Engineering and Mechanical Design Department Faculty of EngineeringMinia UniversityEl Minya 61519Egypt Mechanical and Aerospace Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Department of Production Engineering and Mechanical Design Faculty of EngineeringTanta UniversityTanta 31527Egypt Mechanical Engineering Department Faculty of EngineeringKafrelsheikh UniversityKafrelsheikh 33516Egypt Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityMakkah 24231Saudi Arabia Mechanical Engineering Department Faculty of EngineeringUniversity of AlbertaEdmonton T6G 2R3Canada Automotive and Tractors Engineering Department Faculty of EngineeringMinia UniversityEl Minya 61519Egypt Tokyo Institute of Technology Tokyo 152-8550Japan

Grinding technology is an essential manufacturing operation,in particular,when a component with a superfinishing and an ultra-resolution is *** the required strict quality checklist with maintaining a high level of productivity and sustainability is a substantive *** recent paper outlines the lubrication and cooling technologies and mediums that are used for ***,it provides a basis for a critical assessment of the different lubrication/cooling techniques in terms of machining outputs,environmental impact,hygiene effect,***,the paper put light on the sustainability of different cooling/lubrication *** sustainability of machining aims to get the product with the best accuracy and surface quality,minimum energy consumption,low environmental impact,reasonable economy,and minimum effect on worker’s *** paper revealed that despite some cooling/lubrication mediums like mineral oils and semisynthetic,afford sufficient lubrication or cooling,they have a significant negative impact on the environment and public *** the other hand,emulsions can overcome environmental problems but the economy and the energy consumption during grinding are still a matter of *** and vegetable oils are considered eco-friendly oils,but they suffer from a lack of thermal stability which affects their ability of efficiently *** the cooling medium with the lowest amount can achieve the goal of the economy but it may be reflected negatively on the ***,cryogenic lubrication doesn’t provide sufficient lubrication to reduce friction and hence energy *** research described in the paper is such a comprehensive compilation of knowledge regarding the machinability and machining performance under different cooling and lubrication systems that it will aid the next generation of scientists in identifying current advancements as well as potential future directions of research on ecolo

关键词： Cryogenic cooling Dry lubrication Minimum quantity lubrication Precision grinding Solid lubrication Sustainable machining Vegetable oils

Microplastic in an Arid Region: Identification, Quantification and Characterization on and Alongside Roads in Al Ain, Abu Dhabi, United Arab Emirates

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Journal of Environmental Protection 2022年第10期13卷 671-688页

作者： Rana Zeeshan Habib Tholkappiyan Ramachandran Fathalla Hamed Ruwaya Al Kindi abdel-hamid Ismail mourad Thies Thieman Department of Biology College of Science United Arab Emirates University Al Ain Abu Dhabi United Arab Emirates Department of Mechanical and Aerospace Engineering College of Science United Arab Emirates University Al Ain Abu Dhabi United Arab Emirates Department of Physics College of Science United Arab Emirates University Al Ain Abu Dhabi United Arab Emirates Department of Chemistry College of Science United Arab Emirates University Al Ain Abu Dhabi United Arab Emirates

Microplastic content was analyzed in road dust, soils alongside roads and stormwater run-offs in Al Ain City, Abu Dhabi. Apart from tire wear material, fibers and degradation products of meso- and macroplastics such as plastic bags and plastic bottle tops were found to be the most dominant plastic microparticles. Speed bumps and artificial turf/lawns were also evaluated as potential sources of microplastics on and alongside roads. It was found that in arid regions Aeolian transport of microplastics may be more important than transport by water.

关键词： Road Wear Microplastic Artificial Turf Glass Reflector Beads Speed Bumps

Synthesis and characterization of poly(2,5-diyl pyrrole-2-pyrrolyl methine)semiconductor copolymer

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Journal of Semiconductors 2018年第10期39卷 10-16页

作者： Hammou Gherras Ahmed Yahiaoui Aicha Hachemaoui abdelkader Belfedal abdelkader Dehbi abdel-hamid I.mourad Laboratoire de chimie Organique Macromoleculaire et des Materiaux(LCOMM)Universite de MascaraFaculte des Sciences ExactesBP 763 Mascara 29000Algeria Laboratoire de Chimie Physique des Macromolecules et Interfaces Biologiques Universite de Mascara Algeria Laboratoire de Genie Physique Universite d'Ibn KhaldounTiaret BP 78 14000 TiaretAlgeria Mechanical Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-AinUAE On leave from Mechanical Design Department Faculty of EngineeringHelwan UniversityCairoEgypt

The proposed technique to synthesise poly {（2,5-diyl pyrrole）（2-pyrrolyl methine）}（PPPM） copolymer by condensation of pyrrole and pyrrole-2-carboxaldehyde monomers catalyzed by Maghnite-H＋ is *** protons are exchanged with Maghnite-H＋, which is available in the form of a montmorillonite silicate clay sheet. The effect of several parameters such as time and temperature of copolymerization, [pyrrole]/[pyrrole-2-carboxaldehyde] molar ratio, amount of Maghnite-H＋, and solvent on the produced poly（2,5-diyl pyrrole-2-pyrrolyl methine） semiconductor copolymer material（yield%） was investigated. The synthesized PPPM copolymer was characterized using nuclear magnetic resonance, Fourier transform infrared, and ultraviolet-visible *** results show that the synthesized copolymer using the copolymerization technique is a real organic copolymer consisting of two monomers units（i.e, pyrrole and pyrrole-2-carboxaldehyde）. Also, the synthesized copolymer is more soluble than polypyrrole in most of the commonly used organic solvents. Hence, copolymerization of pyrrole with pyrrole-2-carboxaldehyde will overcome the insolubility of polypyrrole. In addition, the resultant copolymer exhibits good film formability. The produced copolymer has several potential applications in the field of rechargeable batteries, sensors, capacitors, light emitting diodes, optical displays, and solar cells.

关键词： proposed technique Maghnite-H^+ catalyst conducting PPPM copolymer pyrrole pyrrole-2-carboxaldehyde

铝合金及铝金属基复合材料搅拌摩擦焊接工艺的研究进展

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Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3281-3309页

作者： John VICTOR CHRISTY abdel-hamid ISMAIL mourad Muhammad M.SHERIF B.SHIVAMURTHY Mechanical Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-AinP.O.Box.15551United Arab Emirates Mechanical Design Department Faculty of EngineeringHelwan UniversityCairoEgypt National Water and Energy Center United Arab Emirates UniversityAl Ain 15551United Arab Emirates Civil Construction and Environmental Engineering DepartmentCollege of EngineeringUniversity of Alabama–BirminghamBirminghamALUSA Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnatakaIndia

焊接在汽车、航空航天、机器人、建筑等行业具有重要的作用。这些行业常用非焊接方法制造很多铝合金零部件或系统。然而,由于不可热处理合金的存在、孔隙、凝固和熔融裂纹等因素,铝合金的熔焊具有挑战性。许多制造商采用传统的空气搅拌... 详细信息

焊接在汽车、航空航天、机器人、建筑等行业具有重要的作用。这些行业常用非焊接方法制造很多铝合金零部件或系统。然而,由于不可热处理合金的存在、孔隙、凝固和熔融裂纹等因素,铝合金的熔焊具有挑战性。许多制造商采用传统的空气搅拌摩擦焊(FSW)焊接合金和异质材料,也有许多研究报道关于该传统FSW技术在焊接金属和聚合物材料,尤其是铝合金和铝基复合材料方面的缺点。近年来,为了克服传统FSW技术焊接铝合金的缺点,开发出很多其他FSW技术,例如水下搅拌摩擦焊(UFSW)和振动搅拌摩擦焊(VFSW)等。本文综述了近年来铝合金及铝基复合材料(AlMMCs)搅拌摩擦焊接工艺的研究进展,讨论了传统的FSW技术和最先进的FSW工艺参数对铝合金和铝基复合材料焊接质量和强度的影响,并比较了每种方法的优缺点。VFSW在能源效率和经济成本方面具有优势,并可根据应用情况进行多种改进,是焊接铝接头的一种可行的选择。然而,目前对Al MMCs搅拌摩擦焊的研究明显较少,这应给予足够的关注。

关键词：铝合金铝基复合材料传统FSW技术先进FSW技术显微组织力学性能

Analysis of the Solid Contents of Toothpastes Available in UAE (United Arab Emirates) Markets

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Journal of Environmental Protection 2022年第7期13卷 539-556页

作者： Marim Elkashlan Vijo Poulose Rana Zeeshan Habib Obaida Karabala Afnan Aldhanhani Maryam Shakir Heba Shaath Tholkappiyan Ramachandran abdel-hamid Ismail mourad Fathalla Hamed Ruwaya Al Kendi Thies Thiemann Department of Chemistry College of Science United Arab Emirates University Al Ain United Arab Emirates Department of Biology College of Science United Arab Emirates University Al Ain United Arab Emirates Department of Mechanical and Aerospace Engineering College of Engineering United Arab Emirates University Al Ain United Arab Emirates Department of Physics College of Science United Arab Emirates University Al Ain United Arab Emirates

In order to find out whether any toothpastes commercially available in the United Arab Emirates (UAE) carry microplastic content in form of plastic microbeads, the filterable solid contents of 31 toothpastes from UAE markets and 2 toothpastes imported from Syria were analyzed. FT-IR studies of the solids revealed that the major solid components were hydrated silica and calcium carbonate, where the individual toothpaste product exhibited either one or the other as the dominant constituent. Titrimetric analysis of the alkalinity of the ash of the toothpastes was carried out. The solids, ashed at 600°C were subjected to FT-IR and EDS (energy dispersive X-ray spectroscopic) analysis. The ash of some of the products was shown to have TiO2 and Ca3 (PO4)2 as minor components. Mostly organic dyes were used as colorants;however, iron oxide (Fe2O3) was also found. Importantly, none of the toothpastes carried any solid microplastic particles. Only 3 toothpastes carried microbeads at all, which were made of either silica or microcrystalline cellulose. This finding indicates that toothpastes, at least in the UAE, are no longer a significant source of microplastic in the environment. The results were compared to a toothpaste bought through the internet with a formulation from 2014, which exhibited polythene microplastic at 1.31 ± 0.39 w% of the filterable solid content.

关键词： Toothpastes Formulation Microplastic Plastic Pollution Colorants

GCI:a Leading Advocate for Cultural Exchanges

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International Understanding 2024年第1期 15-17页

作者： mourad Alami 不详

On March 15 a year ago,the Chinese top leader proposed the Global Civilisation Initiative,emphasising the importance of common development and common prosperity for the *** exchanges,essentially,involve sharing by people from different countries and backgrounds,ideas,values,traditions and customs,and other knowledge about each other's *** our increasingly intertwined world,cultural exchanges help broaden our vision and enrich our perspective by exposing us to different traditions,values,beliefs.

关键词： exchanges essentially knowledge

Rescue of p53 functions by in vitro-transcribed mRNA impedes the growth of high-grade serous ovarian cancer

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Cancer Communications 2024年第1期44卷 101-126页

作者： Monika Raab Izabela Kostova Samuel Peña-Llopis Daniela Fietz Monika Kressin Seyed Mohsen Aberoumandi Evelyn Ullrich Sven Becker mourad Sanhaji Klaus Strebhardt Department of Gynecology Medical SchoolGoethe-UniversityFrankfurt am MainGermany Translational Genomics in Solid Tumors West German Cancer CenterUniversity HospitalEssenGermany German Cancer Consortium(DKTK) EssenGermany German Cancer Research Center(DKFZ) HeidelbergGermany Histology and Embryology Institute for Veterinary AnatomyGiessenGermany Franfurt Cancer Institute(FCI) Goethe UniversityFrankfurt am MainGermany German Cancer Consortium(DKTK) Partner site Frankfurt/Mainza partnership between DKFZ and University Hospital FrankfurtFrankfurt am MainGermany Experimental Immunology Department for Children and Adolescents MedicineUniversity Hospital FrankfurtGoethe UniversityFrankfurt am MainGermany

Background:The cellular tumor protein p53(TP53)is a tumor suppressor gene that is frequently mutated in human *** various cancer types,the very aggressive high-grade serous ovarian carcinoma(HGSOC)exhibits the high-est prevalence of TP53 mutations,present in>96%of *** intensive efforts to reactivate p53,no clinical drug has been approved to rescue p53 *** this study,our primary objective was to administer in vitro-transcribed(IVT)wild-type(WT)p53-mRNA to HGSOC cell lines,primary cells,and ortho-topic mouse models,with the aim of exploring its impact on inhibiting tumor growth and dissemination,both in vitro and in ***:To restore the activity of p53,WT p53 was exogenously expressed in HGSOC cell lines using a mammalian vector ***,IVT WT p53 mRNA was delivered into different HGSOC model systems(primary cells and patient-derived organoids)using liposomes and studied for proliferation,cell cycle progression,apoptosis,colony formation,and chromosomal *** alterations induced by p53 mRNA were analyzed using RNA sequencing in OVCAR-8 and primary HGSOC cells,followed by ingenuity path-way *** vivo effects on tumor growth and metastasis were studied using orthotopic xenografts and metastatic intraperitoneal mouse ***:Reactivation of the TP53 tumor suppressor gene was explored in differ-ent HGSOC model systems using newly designed IVT mRNA-based *** introduction of WT p53 mRNA triggered dose-dependent apoptosis,cell cycle arrest,and potent long-lasting inhibition of HGSOC cell *** analysis of OVCAR-8 cells upon mRNA-based p53 reactivation revealed significant alterations in gene expression related to p53 signaling,such as apoptosis,cell cycle regulation,and DNA *** p53 function concurrently reduces chromosomal instability within the HGSOC cells,under-scoring its crucial contribution in safeguarding genomic integrity by moderating the baselin

关键词： apoptosis cell cycle chromosomal instability HGSOC metastatic intraperitoneal mouse model HGSOC orthotopic Xenograft model high-grade serous ovarian cancer in vitro-transcribed p53-mRNA liposomal IVT mRNA delivery system patient-derived organoid patient-derived primary cancer cell

Evaluation of the nutritional value of Artemia nauplii for European seabass(Dicentrarchus labrax L.)larvae

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Aquaculture and Fisheries 2024年第1期9卷 78-84页

作者： Alaa A.El-Dahhar Rashwan S.Rashwan Samy Y.EL-Zaeem Shaimaa A.Shahin Mona M.mourad Mohammed F.El Basuini Animal and Fish Production Department Faculty of Agriculture-Saba BashaAlexandria UniversityAlexandria21526Egypt National Institute of Oceanography and Fisheries(NIOF) Cairo11562Egypt Department of Animal Production Faculty of AgricultureTanta UniversityTanta31527Egypt Faculty of Desert Agriculture King Salman International UniversitySouth Sinai46618Egypt

Adapted European seabass(Dicentrarchus labrax L.)larvae at 25 days post-hatching(dph)with a primary weight and length of 23 mg and 9.92 mm,start the weaning up to 46 dph using the weaning micro-diet(54%crude protein from fish meal,powder milk,and poultry egg)concurrently with Artemia enriched with fortification emulsions(0.6 g/L)of DHA selco®as a control group(DHAS)or Fish oil+20%Vitamin C(FOVC),or Fish oil+20%Vitamin E(FOVE),or Fish oil+10%Vit.C+10%Vit.E(FOCE),or Fish oil only(FO).At 46 dph,groups of larvae fed enriched Artemia with DHAS and FOVE exhibited the highest final body weight,weight gain,average daily gain,specific growth rate,feed intake,protein efficiency ratio,and survival%as well as the lowest feed conversion ***,larvae in FOVC displayed the lowest final body weight,total length,weight gain,average daily gain,specific growth rate,feed intake,protein efficiency ratio,and survival%as well as the highest feed conversion *** histological assessment exhibited no pathological alteration as well as an improvement in the structure with DHAS,FOVE,FOVC,and FOCE co-additives compared to *** peroxidase enzyme(GPx)recorded the highest rates(P<0.05)in groups fed Artemia supplemented with DHAS and FOVE followed by FOCE and *** the lowest record for GPx activity was noted in the FO *** conclusion,Using augmented Artemia nauplii with fish oil+vitamin E in single or in companion with vitamin C as cheap antioxidants support *** larval growth,survival,and antioxidant efficacy during the critical weaning period.

关键词： European seabass Gastrointestinal histology Antioxidants Vitamin C Vitamin E DHA