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Influence of erbium on structural,and charged particles,photons,and neutrons shielding properties of Ba_(1-x)Er_(x)SnO_(3) perovskite ceramics

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Journal of Rare Earths 2024年第4期42卷 724-732页

作者： m.k.h.hamad Nidal Dwaikat m.h.A.mhareb m.I.Sayyed R.m.hamad Y.S.m.Alajerami m.A.Almessiere Gameel Saleh Ahmad hussein Alomari k.A.Ziq Department of Basic Sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Department of Physics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Basic and Applied Scientific Research Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Department of Physics Faculty of ScienceIsra UniversityAmman11622Jordan Department of Nuclear medicine Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia medical Imaging Department Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Department of Biomedical Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&minerals Regulatory Commission Amman11821Jordan

Five perovskite ceramics samples of Ba_(1-x)Er_(x)SnO_(3) with x=0.00,0.05,0.10,0.15,and 0.20 were synthesized using the conventional solid-state reaction *** prepared samples were characterized by X-ray diffraction(XRD),Fourier transforms infrared(FTIR),and UV-Vis *** shielding properties against ionizing radiation were also *** XRD analysis shows the perovskite cubic structure as the major phase in all *** FTIR reveals a distinctive band around 614-620 cm^(-1) ascribed to the antisymmetric O-Sn-O ***-Vis spectroscopy was used to determine the bandgap according to diffuse reflectance,and the results display a fixed enhancement in the bandgap from 3.2 to 3.3 eV for all ***-ray shielding properties of the synthesized samples were experimentally measured and compared with XCOm computational *** relative differences(Δ,%)between experimental and theo retical values are low and fall within the 0.446%-7.10%*** addition of Er leads to the enhanced density,neutron,and gamma shielding *** contrast,charged particles’shielding parameters gradually reduce with rising Er *** results suggest that Ba_(1-x)Er_(x)SnO_(3) samples can be used in different radiation shielding applications.

关键词： Perovskite Ceramics Gamma ray shielding mass stopping power Rare earths

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Applied mathematics and mechanics(English Edition) 2012年第7期33卷 923-930页

作者： m. A. A. hamad m. FERDOWS Department of mathematics Faculty of Science Assiut University School of mathematical Sciences Universiti Sains Malaysia Department of mathematics University of Dhaka

The boundary-layer flow and heat transfer in a viscous fluid containing metallic nanoparticles over a nonlinear stretching sheet are analyzed. The stretching velocity is assumed to vary as a power function of the distance from the origin. The governing partial differential equation and auxiliary conditions are reduced to coupled nonlinear ordinary differential equations with the appropriate corresponding auxiliary conditions. The resulting nonlinear ordinary differential equations （ODEs） are solved numerically. The effects of various relevant parameters, namely, the Eckert number Ec, the solid volume fraction of the nanoparticles ~, and the nonlinear stretching parameter n are discussed. The comparison with published results is also presented. Different types of nanoparticles are studied. It is shown that the behavior of the fluid flow changes with the change of the nanoparticles type.

关键词： nanofluid nonlinearly stretching sheet similarity solution nonlinearordinary equation partial differential equation viscous flow

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Photocatalytic parameters and kinetic study for degradation of dichlorophenol-indophenol (DCPIP) dye using highly active mesoporous TiO_2 nanoparticles

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Journal of Environmental Sciences 2016年第5期28卷 26-39页

作者： h.A.hamad W.A.Sadik m.m.Abd El-latif A.B.kashyout m.Y.Feteha Fabrication Technology Department Advanced Technology and New Materials Research Institute (ATNMRI)City of Scientific Research and Technology Applications (SRTA-City) materials Science Department Institute of Graduate Studies and Research (IGSR) Alexandria University Electronic materials Department Advanced Technology and New Materials Research Institute (ATNMRI)City of Scientific Research and Technology Applications (SRTA-City)

highly active mesoporous TiO_2 of about 6 nm crystal size and 280.7 m^2/g specific surface areas has been successfully synthesized via controlled hydrolysis of titanium butoxide at acidic medium. It was characterized by means of XRD（X-ray diffraction）, SEm（scanning electron microscopy）, TEm（transmission electron microscopy）, FT-IR（Fourier transform infrared spectroscopy）, TGA（thermogravimetric analysis）, DSC（differential scanning calorimetry） and BET（Brunauer–Emmett–Teller） surface area. The degradation of dichlorophenol-indophenol（DCPIP） under ultraviolet（UV） light was studied to evaluate the photocatalytic activity of samples. The effects of different parameters and kinetics were investigated. Accordingly, a complete degradation of DCPIP dye was achieved by applying the optimal operational conditions of 1 g/L of catalyst, 10 mg/L of DCPIP, ph of 3 and the temperature at 25 ± 3°C after 3 min under UV irradiation. meanwhile, the Langmuir–hinshelwood kinetic model described the variations in pure photocatalytic branch in consistent with a first order power law *** results proved that the prepared TiO_2 nanoparticle has a photocatalytic activity significantly better than Degussa P-25.

关键词： Photocatalytic degradation mesoporous TiO2 kinetics Organic dye

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Biosynthesized CS-mgO/zeolite hybrid material:An efficient adsorbent for chlorpyrifos removal-kinetic studies and response surface methodology

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Emerging Contaminants 2024年第3期10卷 304-317页

作者： mohammed T.m.h.hamad Belal N.A.mahran Central Laboratory for Environmental Quality monitoring National Water Research CenterEgypt

The prevalence of organophosphate pesticides in aquatic environments raises severe concerns on a global ***,an insecticide,is included in a class of organophosphate *** is widely used on agricultural lands to control pests in cotton,fruit,and *** acute toxicity of chlorpyrifos is still dangerous to all aquatic living *** the treatment of water contaminated with chlorpyrifos is an important *** recent decade has witnessed adsorption technology emerging as an advanced organophosphate pesticide wastewater treatment with great potential and a grand blueprint,in which the specific surface area and active sites of the adsorbent are considered to be the two most important characteristics largely impacting the adsorption *** this study,a CS-mgO/Zeolite composite was prepared by the microbial method as an effective adsorbent for the removal of chlorpyrifos from an aqueous *** adsorbent's properties were carefully characterized using Xray diffraction,scanning electron microscopy,and Fourier-transform infrared *** refinement of experimental conditions,encompassing variations in adsorbent dosage,contact time,and chlorpyrifos concentration at five discrete levels,was systematically undertaken through the utilization of a composite central design rooted in response surface *** solution ph played a key role in chlorpyrifos removal,and a ph of 7.0 was selected according to its high adsorption *** highest removal(80.9%)of chlorpyrifos by CS-mgO/Zeolite was obtained at an optimum ph of 7,a contact time of 40 min,an adsorbent dosage of 0.4 g/L,and a chlorpyrifos concentration of 5 mg/L^(-1).The adsorption results were highly fitted with the Freundlich adsorption isotherm model,and the maximum adsorption was 83.3 mg/*** studies indicate that the removal of chlorpyrifos followed the pseudo-secondorder model of adsorption(0.994).The thermodynamic parameters indicate the sponta

关键词： Chlorpyrifos adsorption CS-mgO/Zeolite Response surface methodology

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Theoretical investigations on electrocaloric properties of(111)-oriented Pbmg_(1/3)Nb_(2)/3O_(3) single crystal

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Journal of Advanced Ceramics 2013年第4期2卷 308-312页

作者： mahmoud Aly hamad Physics Department Faculty of ScienceTanta UniversityTantaEgypt

The electrocaloric(EC)effect accompanied with the ferroelectric to paraelectric phase transition in(111)-oriented Pbmg_(1/3)Nb_(2)/3O_(3)(PmN)is *** is shown that the largest change TDis 0.37 k in 3 kV/cm electric field shift near the Curie temperature of 221 k;that is,the cooling TDper unit field(mV/m)is 1.23×10^(-6) m·k/*** value is significantly larger,and comparable with the value of 0.254×10^(-6) m·k/V for PbZr_(0.95)Ti_(0.05)O_(3)thin film under larger electric field shift ED=30 kV/***,the EC effect of(111)PmN single crystal provides cooling solutions at low temperatures,and opens more opportunities for practical application in cooling systems.

关键词： electrocaloric(EC)effect Pbmg_(1/3)Nb_(2)/3O_(3)(PmN) model polarization entropy change heat capacity change

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Torsional postbuckling characteristics of functionally graded graphene enhanced laminated truncated conical shell with temperature dependent material properties

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Theoretical & Applied mechanics Letters 2023年第4期13卷 272-279页

作者： hamad m.hasan Saad S.Alkhfaji Sattar A.mutlag Department of mechanical Engineering University of AnbarRamadi 31001Iraq Department of medical Instrumentation Engineering Ashur University CollegeBaghdad 10044Iraq

Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEm)simulation are presented in this *** the thickness direction,the GEC layers of the conical shell are ordered in a piece-wise arrangement of functionally graded(FG)distribution,with each layer containing a variable volume fraction for graphene *** calculate the properties of temperaturedependent material of GEC layers,the extended halpin-Tsai micromechanical framework is *** FEm model is verified via comparing the current results obtained with the theoretical estimates for homogeneous,laminated cylindrical,and conical shells,the FEm model is *** computational results show that a piece-wise FG graphene volume fraction distribution can improve the torque of critical buckling and torsional postbuckling ***,the geometric parameters have a critical impact on the stability of the conical ***,a temperature rise can reduce the crucial torsional buckling torque as well as the GEC laminated truncated conical shell’s postbuckling strength.

关键词： Torsional postbuckling Graphene enhanced composite Functionally graded graphene Finite element method Conical shell

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Temperature effect on the corrosion and passivation characterization of Ni_(82.3)Cr_7Fe_3Si_(4.5)B_(3.2) alloy in acidic media

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International Journal of minerals,metallurgy and materials 2016年第2期23卷 205-214页

作者： khadijah m.Emran Sanaa T.Arab Aisha m.Al-Turkustani hamad A.Al-Turaif Chemistry Department Faculty of Science Taibah University Department of Chemistry Faculty of Sciences Al-Faisaliah King Abdulaziz University Department of Chemical and materials Engineering King Abdulaziz University

The effects of temperature on corrosion and the electrochemical behavior of Ni82.3Cr7Fe3Si4.5B3.2 glassy alloy in hC1,h2SO4,and h3PO4 acids were studied using AC and DC *** data reveal that the susceptibility to localized corrosion increases with increasing *** polarization curves reveal that the bulk glassy alloy is spontaneously passivated at all the investigated temperature in h2SO4 and h3PO4 solutions.A localized corrosion effect in hCl solution is clearly *** apparent activation energies in the regions of Tafel,active,and passive,as well as the enthalpies and entropies of the dissolution process were determined and *** high apparent activation energy（Ea） value for h3PO4 solution in Tafel region is explained by the low aggressivity of PO4^3- ions.

关键词： nickel alloys corrosion temperature effect acidic environment passivation polarization

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Preparation of quantum size of tin oxide: Structural and physical characterization

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Progress in Natural Science:materials International 2016年第2期26卷 145-151页

作者： N.m.Shaalan D.hamad A.Y.Abdel-Latief m.A.Abdel-Rahim Physics Department Faculty of Science Assiut University

SnO2NPs were successfully prepared via a hydrothermal method. X-ray diffraction analysis con fi rmed the rutile tetragonal structure of SnO2NPs. The crystallite size increased from 1.18 to 5.06 nm with increasing the preparation temperature from 100 to 180 °C. The SEm photography of the products exhibited the agglomeration of the SnO2nanocrystals to large view particles, while TEm images con fi rmed the polycrystalline phase and crystallite size those analyzed from XRD. The UV–vis absorption of ethanol suspended SnO2NPs was measured. The optical band-gap energies（Eg） were signi fi cantly blue-shifted due to quantum con fi nement. Fluorescence spectra came to con fi rm this shift, where a clear shift in the maximum emission peak was observed. Stokes shift of SnO2nanocrystals was found to be crystallite size dependent.

关键词： Nanostructures Tin dioxide Luminescence Optical properties

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Neoadjuvant therapy for pancreatic ductal adenocarcinoma:Opportunities for personalized cancer care

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World Journal of Gastroenterology 2021年第27期27卷 4383-4394页

作者： Ahmad hamad Zachary J Brown Aslam m Ejaz mary Dillhoff Jordan m Cloyd Department of Surgery The Ohio State University Wexner Medical CenterColumbusOH 43215United States

Pancreatic ductal adenocarcinoma(PDAC)is an aggressive malignancy that is best treated in a multidisciplinary fashion using surgery,chemotherapy,and *** chemotherapy has shown to have a significant survival benefit in patients with resected ***,up to 50%of patients fail to receive adjuvant chemotherapy due to postoperative complications,poor patient performance status or early disease *** order to ensure the delivery of chemotherapy,an alternative strategy is to administer systemic treatment prior to *** oncology refers to the application of diverse strategies to target therapies specific to characteristics of a patient’s *** traditionally emphasized in selecting targeted therapies based on molecular,genetic,and radiographic biomarkers for patients with metastatic disease,the neoadjuvant setting is a prime opportunity to utilize personalized *** this article,we describe the current evidence for the use of neoadjuvant therapy(NT)and highlight unique opportunities for personalized care in patients with PDAC undergoing NT.

关键词： Pancreatic cancer Preoperative therapy FOLFIRINOX Precision oncology Patient-reported outcomes Personalized medicine Targeted therapy Whipple Pancreatectomy

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Refinement and estimation of asphalt flow number using partial load history

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 120-133页

作者： m.A.Dalhat khaleel Al-Adham hamad I.Al-Abdul Wahhab Arshad Jamal Department of Transportation and Traffic Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityDammamSaudi Arabia Department of Civil and Environmental Engineering King Fahd University of Petroleum and MineralsDhahranSaudi Arabia

The effect of tertiary flow length on asphalt concrete(AC) flow number(FN) has been studied in this paper. The standard FN test(AAShTO T378) designated by American Association of State highway and Transportation Officials(AAShTO) is currently among the widely adopted test for assessing the rutting performance of AC mixtures. The standard adopts the Fracken model(Fm) for fitting the permanent deformation curve(PDC), prior to FN estimation. The FN was observed to vary as tertiary flow progresses. The Fm, along with other PDC models(mFm-1 and mFm-2) obtained by modifying the Fm, was utilized to analyze and minimized this variation. Variation of FN resulted because of mathematization of the PDC data. Instead of representing the actual initiating point of permanent shear deformation of the strain data, estimated values of FN were observed to indicate the inflection points of the fitted parent curve. As per standard FN range suggested by AAShTO T378, the observed variation in FN leads to the situation, where a single asphalt mix specimen can be regarded as appropriate for two different traffic levels, depending on the tertiary flow point at which the test is terminated. Supplementary steps in the FN estimation methods were proposed for refinement of FN values. For the refinement and further standardization of FN value and FN test respectively, FN:T(flow number to test duration ratio) has been recognized as the key and most simple solution. Two potential options for employing FN:T in the estimation of FN have also been highlighted. Several important correlations have been reported herein as well. Comparatively, mFm-1 was found to be more robust in FN:T curve utilization than mFm-2 and Fm.

关键词： Road engineering hmA Permanent deformation Flow number Francken model Tertiary flow

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