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Thermal performance of lightweight concrete applications in building envelopes in Lebanon

Building Simulation 2021年第5期14卷 1359-1375页

作者： Emilio Sassine elias Kinab Yassine cherif Emmanuel Antczak Michel Nasrallah Lebanese University Habitat and Energy UnitGroup of Thermal and Renewable Energies-Laboratory of Applied Physics(LPA-GMTER)Faculty of SciencesFanar CampusLebanon Lebanese University Faculty of EngineeringRoumiehEl MetnLebanon Univ.Artois ULR4515Laboratoire de Genie Civil et geo-Environnement(LGCgE)BethuneF-62400France CC Technique Memari StreetHamraBeirutLebanon

Innovative building materials are being used in building envelopes for reducing their heating and cooling *** paper aims to assess the thermal impact of using lightweight concrete in Lebanese building constructions by pouring an 8 cm thickness of lightweight concrete on the roof and the slab and replacing traditional hollow concrete block by lightweight concrete *** properties of two different samples were experimentally determined:the first one(558 kg/m^(3))used for the roof and the slab and the second one(1074 kg/m^(3))used for the *** numerical simulations were carried out for a Lebanese traditional detached house using the characteristics of these two *** thermally improved Light Weight Concrete building(LWC)was compared to a traditional Lebanese house base case(BC)using a dynamic building energy simulation tool in the four different Lebanese climate zones:coastal,mid-mountain,mountain,and inland *** results highlight the effectiveness of integrating LWC to building envelopes by reducing energy consumption and improving thermal comfort in both winter and summer climate conditions and in the different Lebanese climatic *** paper demonstrates that the use of LWC in the vertical walls replacing the traditional hollow blocks can reduce the heating needs by up to 9%and by up to 13%for cooling *** the other hand,adding a LWC roof screed has a very high impact on cooling and heating energy consumption,which can reach up to 74%in cooling energy savings and up to 24%in heating energy savings.

关键词： lightweight concrete thermal properties building energy simulation thermal insulation climatic conditions

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Geochemical constraints and uranium potential of the younger granitic rocks in el Maghrbia area, Central Eastern Desert, Egypt

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Acta Geochimica 2021年第4期40卷 623-639页

作者： A.E.el-Kammar A.H.el-Afandy T.Nasr M.Coltorti F.Casetta Department of Geology Faculty of ScienceCairo UniversityCairoEgypt Nuclear Materials Authority El MaadiCairoEgypt Department of Physics and Earth Sciences University of FerraraFerraraItaly

The present work deals with the mineralogy,geochemical behavior and uranium potentiality of the monzogranites of el Maghrbia area,which comprise *** Maghrbia and *** Eredyia and situated in the central Eastern Desert of ***-Erediya monzogranites represents a promising area for uranium *** granites have shear zone filled with red and black silica veins containing many radioactive anomalies with visible yellow secondary uranium *** shear zone is highly affected by different degrees of alterations such as silicification,kaolinitization,sassuritization and *** of el-Erediya area possess higher values of their radioactivity than in el Maghrbia monzogranites in which eU and eTh,reaches up to 792.3 and 66.81 ppm,whilst average content of eU and eTh in el Maghrabia granites are 3.86 and 8.55 ppm,respectively owing to the presence of radioactive minerals such as uraninite,uranothorite,uranophane,kasolite,betafite,zircon and *** geochemical analyses indicated that,the studied monzogranites are distinctly anomalous in U,where the average U is more than 620-fold the Upper Continental Crust(UCC),marked enrichment(> tenfold) of the elements Cd,Mo,Pb,Bi,Nb and *** Th/U ratio decreases from 2.8,as a chondritic value,to 0.0023 for the studied granites,proposing extreme fractionation towards an extensive secondary migration-in of *** Zr and Hf are depleted in the studied granites relative to the UCC,whereas Nb and Ta are strongly *** content of Y is about sixfold enriched which reflects relative enhancement of the HREE during the alteration *** correlates with Fe_(2)O_(3),suggesting a possible association between uranium and ***,the occurrences of uranium are epigenetic by remobilization from the host rock to the sheared zones,probably through metasomatic process where U-Fe-Mg replaced the feldspars in an oxidized *** high levels of radioactivity in the rocks

关键词： Potentiality Uranium Geochemistry el Maghrabia el Erediya Egypt

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Milk losses due to bovine tropical theileriosis(Theileria annulata infection) in Algeria

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Asian Pacific Journal of Tropical Biomedicine 2016年第9期6卷 801-802页

作者： Ouarda Ayadi Mohamed Gharbi Mohamed cherif Benchikh elfegoun Laboratory of Parasitology Institute of Veterinary Science El KhroubUniversity of Mentouri Brothers Laboratory of Parasitology National School of Veterinary MedicineInstitution of Agricultural Research and Higher EducationUniv.

The authors studied the impact of tropical theileriosis onset on milk yield decrease in 10 local bred cows in Skikda(Northern Algeria) during 2015 summer *** milk yield decrease estimated weekly during two months was 2.76 L/day/cow corresponding to31.92% of the total milk *** decrease corresponds to 110.5 Algerian Dinars(1.02US$)/day/diseased *** relative variation of milk yield showed a dramatic decrease from 82.72% to 0.76% at Day 21 then became *** studies are needed to improve these estimations of financial losses due to bovine tropical theileriosis in Algeria.

关键词： Theileria annulata Milk Cattle Local breed

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Complement-dependent neuroinflammation in spinal cord injury:from pathology to therapeutic implications

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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 Juanmarco Gutierrez Gonzalez Daniel Refai Gerald R.Rodts Christian Mustroph David Gimbel Jonathan Grossberg Daniel L.Barrow Matthew F.Gary Ali M.Alawieh Department of Neurosurgery Emory University School of MedicineAtlantaGAUSA Department of Neurology Yale UniversityNew HavenCTUSA Center for Neurotrauma Multiomics&Biomarkers(CNMB)Morehouse School of MedicineAtlantaGAUSA

Spinal cord injury remains a major cause of disability in young adults,and beyond acute decompression and rehabilitation,there are no pharmacological treatments to limit the progression of injury and optimize recovery in this *** the thorough investigation of the complement system in triggering and propagating cerebral neuroinflammation,a similar role for complement in spinal neuroinflammation is a focus of ongoing *** this work,we survey the current literature investigating the role of complement in spinal cord injury including the sources of complement proteins,triggers of complement activation,and role of effector functions in the *** study relevant data demonstrating the different triggers of complement activation after spinal cord injury including direct binding to cellular debris,and or activation via antibody binding to damage-associated molecular *** effector functions of complement have been implicated in spinal cord injury,and we critically evaluate recent studies on the dual role of complement anaphylatoxins in spinal cord injury while emphasizing the lack of pathophysiological understanding of the role of opsonins in spinal cord *** this pathophysiological review,we systematically review the different translational approaches used in preclinical models of spinal cord injury and discuss the challenges for future translation into human *** review emphasizes the need for future studies to dissect the roles of different complement pathways in the pathology of spinal cord injury,to evaluate the phases of involvement of opsonins and anaphylatoxins,and to study the role of complement in white matter degeneration and regeneration using translational strategies to supplement genetic models.

关键词： complement neuroinflammation neuroplasticity regeneration spinal cord injury targeted therapy

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A Proposed Biometric Authentication Model to Improve Cloud Systems Security

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Computer Systems Science & Engineering 2022年第11期43卷 573-589页

作者： Hosam el-el-Sofany King Khalid University AbhaKingdom of Saudi Arabia Cairo Higher Institute for Engineering Computer Science and ManagementCairoEgypt

Most user authentication mechanisms of cloud systems depend on the credentials approach in which a user submits his/her identity through a username and ***,this approach has many security problems because personal data can be stolen or recognized by *** paper aims to present a cloud-based biometric authentication model(CBioAM)for improving and securing cloud *** research study presents the verification and identification processes of the proposed cloud-based biometric authentication system(CBioAS),where the biometric samples of users are saved in database servers and the authentication process is implemented without loss of the users’*** paper presents the performance evaluation of the proposed model in terms of three main characteristics including accuracy,sensitivity,and *** research study introduces a novel algorithm called“Bio_Authen_as_a_Service”for implementing and evaluating the proposed *** proposed system performs the biometric authentication process securely and preserves the privacy of user *** experimental result was highly promising for securing cloud services using the proposed *** experiments showed encouraging results with a performance average of 93.94%,an accuracy average of 96.15%,a sensitivity average of 87.69%,and a specificity average of 97.99%.

关键词： Cloud computing cloud security biometrics technologies biometric authentication

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Origin and geochemical characteristics of beryllium mineralization in the Zabara-Wadi el Gemal region,South Eastern Desert,Egypt

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Acta Geochimica 2024年第6期43卷 1105-1122页

作者： Gehad M.Saleh Farrage M.Khaleal Mohammed Z.el-Bialy Mohamed S.Kamar Mokhles K.Azer Mohamed M.Omar Mohamed N.el Dawy Ahmed Abdelaal el Saeed R.Lasheen Nuclear Materials Authority El-MaadiP.O.Box 530CairoEgypt 2 Geology DepartmentFaculty of SciencePort Said UniversityPort Said 42522Egypt 3 Geological Sciences DepartmentNational Research CentreCairoEgypt 4 Environmental Sciences DepartmentFaculty of SciencePort Said UniversityPort Said 42522Egypt 5 Geology DepartmentFaculty of ScienceAl-Azhar UniversityP.O.Box 11884CairoEgypt

Beryl is the commercial source of beryllium and several varieties of it are valued as a *** contribute to understanding the mechanism of beryl formation,we carried out detailed geological,petrographical,and geochemical investigations on beryl mineralization occurrences in the Zabara-Wadi el Gemal(Z-WG)*** region is an NW-SE trending tract that includes six berylhosting *** green gem variety of beryl(emerald)is restricted to phlogopite schist,pegmatite,and quartz *** hexagonal emerald crystals are well-developed in phlogopite schist and *** gem variety emerald examined is sodic and *** contains high concentrations of chromophore transition elements ordering Cr(up to 1511 ppm)>V(up to 242 ppm)>Sc(up to 245 ppm),giving rise to its vivid green color,refl ecting mafic-ultramafic source *** the investigated emeralds,the Sikait area contains the highest BeO(av.10.76wt.%)*** compositional variability of emeralds is most likely attributed to the contribution from the host *** is revealed by the examined emerald mineralization,for instance;the Abu Rusheid area(one of the best areas exposing rare metal-bearing granitoids)possesses the highest average of trace and REEs *** contrast,Um Kabu emerald has the highest contents of Co(av.20 ppm),Ni(av.299 ppm),MgO(av.8.2wt.%),Fe_(2)O_(3)(av.3.12wt.%),and CaO(avg.3.4wt.%)relative to other areas,which may be linked to contribution of ultramafic rocks exposed *** proposed mechanism we suggest for emerald genesis is metasomatic interaction between felsic intrusions,that are enriched with K,Na,Be,Li,and B,with mafic-ultramafic rocks that are enriched in Cr,V,Mg,Fe,and *** interaction is marked by the formation of phlogopite schist,the growth of emerald crystals,and desilicated pegmatite.

关键词： Beryl chemistry Emerald genesis Phlogopite schist Pegmatite Eastern Desert

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Petrology, geochemistry, radioactivity, and M–W type rare earth element tetrads of el Sela altered granites, south eastern desert,Egypt

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Acta Geochimica 2019年第1期38卷 95-119页

作者： A.M.el Mezayen M.A.Heikal M.G.el-Feky H.A.Shahin I.K.Abu Zeid S.R.Lasheen Geology Department Faculty of Science Al Azhar University Nuclear Material Authority

The southern part of the Eastern Desert of Egypt—about 30 km southwest of Abu-Ramad city—is mainly covered by ophiolitic rocks(Sul Hamed), island arc assemblage, younger granites(muscovite granites of Qash Amer and two mica granites of el Sela), and various acidic and basic dikes. Field, petrological, and geochemical studies indicate that the el Sela shear zone has been subject to hydrothermal and supergene alteration such as kaolinization, albitization, sericitization, and hematitization. It is invaded by quartz ENE–WSW veins associated with hydrothermal alteration accompanied by radioactive mineralization. The investigated younger granitic rocks had very low contents of compatible elements, such as Cr, Ni,and Co; and high contents of incompatible elements, such as Zr, and large ion lithophiles, such as Sr, especially in the el Sela shear zone. Major oxide and trace element analyses revealed calc-alkaline affinity and peraluminous *** highly differentiated granitic rocks' lower Zr/Hf and higher Y/Ho than the normal ratio are consistent with hydrothermal alteration. Most samples had rare earth element(REE)-patterns with an M-type tetrad effect in the first and fourth segments and a W-type tetrad in the third segment. The average ∑REE in the studied granites was lower than the world granite average; the ratio of light to heavy REEs greater. The main radioactive, uranium-bearing, and uraniferous Fe and Mn minerals are uranothorite,autunite, uranophane and autunite as compounds, kasolite,columbite, xenotime, uranophane-bearing zircon and jarosite, silver-bearing pyrite, hematite, and autunite-bearing pyrolusite.

关键词： Geochemistry REE-tetrad effect Radioactive minerals Radiometric measurements Qash Amer el Sela

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Effect of diluents on the extraction of praseodymium and samarium by Cyanex 923 from acidic nitrate medium

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Journal of Rare Earths 2010年第2期28卷 215-220页

作者： YA el-Nadi Hot Laboratories Centre Atomic Energy Authority(Egypt)

The solvent extraction of Pr(Ⅲ) and Sm(Ⅲ) with trialkyl phosphine oxide(Cyanex 923) in chloroform,carbon tetrachloride,n-octane,cyclohexane,1,2-dichloroethane,benzene,toluene,xylene and nitrobenzene from acidic nitrate medium was *** the basis of slope analysis data,the composition of the extracted species was determined as(M(NO3)3?2CY923),CY923 refers to Cyanex *** values of the equilibrium constants and the separation factors were *** effect of the diluents on the metal extracti...

关键词： extraction diluents praseodymium samarium Cyanex 923 rare earths

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Effect of different metal sulfate precursors on structural and catalytic performance of zirconia in dehydration of methanol 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： Abd el-Aziz A.Said Mohamed Abd el-Aal Chemistry Department Faculty of ScienceAssiut University71516 AssiutEgypt

ZrO_2 was treated with 10% SO_4^(2-) from different metal sulfate precursors for methanol dehydration to dimethyl *** the samples exhibited tetragonal phase and no diffraction peaks corresponding to metal sulfates or metal oxides were *** FT-IR results revealed that there were different interactions between sulfate and ZrO_2,and this had a great effect on the surface area of the *** catalytic activity was measured over the catalysts in the temperature range of 100-300 ℃.The results revealed that sulfated zirconia with CuSO_4·5 H_2O and Al_2(SO_4)_3·16 H_2O showed the best catalytic *** maximum yield of DME ≈87% was obtained over CuSZ at a reaction temperature of 275 ℃.Moreover,the catalytic activity of the catalysts was correlated well with their surface acidity that measured by dehydration of isopropanol.

关键词： MSO 4/ZrO2 甲醇脱水 DME

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pH-indicative Films Based on Chitosan–PVA/Sepiolite and Anthocyanin from Red Cabbage: Application in Milk Packaging

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Journal of Bionic Engineering 2022年第3期19卷 837-851页

作者： Marya Raji Laila el Foujji Mohamed el Mehdi Mekhzoum Mounir el Achaby Hamid Essabir Rachid Bouhfid Abou el kacem Qaiss Moroccan Foundation for Advanced Science Innovation and ResearchComposites and Nanocomposites CenterRabat Design CenterRue Mohamed El JazouliMadinat El IrfaneRabat10100Morocco Faculty of Science Laboratoire de Chimie Organique Et HétérocycliqueUniversity Mohammed V in RabatRabat10100Morocco Materials Science and Nano-Engineering Department Mohammed VI Polytechnic UniversityLot 660–Hay Moulay RachidBen Guerir43150Morocco Mechanic Materialsand Composites(MMC)Laboratory of Energy EngineeringMaterials and SystemsNational School of Applied Sciences of AgadirIbn Zohr UniversityAgadir80000Morocco

Biobased smart packaging is been the most interesting research *** this study,pH-sensitive films based on anthocyanin molecules from red cabbage and sepiolite mineral nano-clay as functional additives were *** films were fabricated by casting method of blend polymer Chitosan/Poly(Vinyl Alcohol)at two fillers loading(5wt.%and 10wt.%).The structural,morphological,thermal,optical,hygroscopic,and mechanical properties as well as the pH sensitivity of films were *** thermal properties confirm that the amount of the anthocyanin in sepiolite was around 6.4%.The tensile strength and the young’s modulus of produced composites at 10wt.%sepiolite–anthocyanin content was increased to 8.90 MPa and 163 MPa,*** maximum water absorption that the films may absorb was 12.3%.pH sensitivity analysis showed that the Smart films change the color by changing the pH level,from pink at pH lower than 6 to yellow at pH higher than ***,the developed pH-sensitive films show band gaps in visible light that make them useful for monitoring milk spoilage.

关键词： Smart packaging Anthocyanin Red cabbage pH-sensitive and milk spoilage

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