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Mechanical and magneto-electronic properties of europium lanthanide-based cubic perovskites EuYO_(3)(Y=Cr, Mn, Fe): An ab initio study

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Journal of Rare Earths 2024年第3期42卷 562-569,I0005页

作者： Hayat Ullah Azra Sarwar sajad ali Rabah Khenata Abdelmadjid Bouhemadou Saad Bin-Omran Department of Physics Women University of Azad Jammu&Kashmir Bagh 10250Pakistan Department of Physics Abdul Wali Khan UniversityMardan23200KPPakistan LPQ3M Laboratory Institute of Science and TechnologyUniversity of Mascara29000MascaraAlgeria Laboratory for Developing New Materials and Their Characterization Farhat Abbas University Setif l19000SetifAlgeria Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia

Computational calculations using density functional theory(DFT) were performed for the first time using the full potential linearized augmented plane wave plus local orbital method(FP-LAPW + LO) to determine the structural, elastic, electronic and magnetic properties of europium-based cubic perovskites EuYO_(3)(Y=Cr, Mn, Fe). The exchange correlation potentials of GGA along with some analytical methods were adopted for the computation of structural and elastic properties. Moreover, the GGA + U formalism was also added for obtaining more precise electronic and magnetic properties, particularly to address the Eu-4f and Y-3d orientations in the spin-polarized double cell symmetry. The observed lattice parameters of these compounds are consistent with experiment. The observed bulk moduli predict that EuCrO_(3) is harder and less compressible than EuMnO_(3) and EuFeO_(3). The calculated tolerance factors of these compounds are within the cubic symmetry range. Our computed critical radius of EuCrO_(3) shows that EuCrO_(3) has a larger migration energy. Based on their elastic properties, these compounds are ductile in nature. We also computed the thermal properties of these compounds. The band structures and density of states show that these compounds are metallic in character. The lowest ground state energy and magnetic moments of these compounds expose their ferromagnetic nature. The metallic nature and strong ferromagnetism of these compounds make them promising applicants for application in spintronic.

关键词： Perovskites GGA+U Elastic constants Band structure Magnetic moments Rare earths

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配电网窃电的预防和检测

配电网窃电的预防和检测

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作者： sajad ali 兰州交通大学

学位级别：硕士

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Plasma diagnostics by optical emission spectroscopy on manganese ore in conjunction with XRD, XRF and SEM-EDS

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Plasma Science and Technology 2019年第8期21卷 103-110页

作者： Muhammad FAHAD sajad ali Yaseen IQBAL Department of Electrical and Computer Engineering COMSATS University IslamabadAbbottabadCampusUniversity Road22060AbbottabadPakistan Materials Research Laboratory(MRL) Department of PhysicsUniversity of Peshawar25120PeshawarPakistan

Manganese(Mn) is an important industrial mineral.Information about the chemical and phase constitution along with the concentration of impurities presented in Mn ore is compulsory in assessing its suitability for different applications.We performed the qualitative and quantitative analysis of low-grade Mn ore(LGMO) using laser-induced breakdown spectroscopy(LIBS) in conjunction with x-ray diffraction(XRD), x-ray fluorescence(XRF) and scanning electron microscopy(SEM) coupled with energy dispersive x-ray electron spectroscopy(EDS).The optical emission spectra of the LGMO sample displayed the presence of Mn, Si, Ca, Fe, Al, Mg,V, Ti, Sr, Ni, Na, Ba and Li.The plasma parameters, electron temperature and number density were estimated using the Boltzmann plot and Stark broadening line profile methods and were found to be 7500 K±750 K and 8.18±0.8×1017 cm-3, respectively.Quantitative analysis was performed using the calibration-free LIBS(CF-LIBS) method and its outcome along with XRD, XRF and SEM-EDS data showed almost analogous elemental composition, while the LIBS method gave acceptably precise elemental analysis by detecting the low atomic number element Li besides V and Sr.The results obtained using LIBS for the LGMO exhibited its ability as a powerful analytical tool and XRF, XRD and SEM-EDS as complementary methods for the compositional analysis of complex low-grade mineral ore.

关键词： plasma diagnostic optical emission spectroscopy spectrochemical analysis laser-induced breakdown spectroscopy SEM-EDS

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Electrostatic Rayleigh-Taylor Mode in Electron-Positron-Ion Quantum Plasma

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Journal of Modern Physics 2017年第4期8卷 636-653页

作者： sajad ali Mushtaq Ahmad Department of Physics FPNS Abdul Wali Khan University Mardan Pakistan Department of Physics FBAS International Islamic University (IIUI) Islamabad Pakistan

Electrostatic Rayleigh-Taylor (ERT) mode/instability is studied in a non-uni-form quantum magnetoplasma, whose constituents are electrons and positrons with fraction of ions. The effects of quantum corrections (i.e. Bohm potential and temperature degeneracy) and magnetic field on ERT mode are investigated with astrophysical plasma application. A generalized dispersion relation is deduced under the drift wave approximation. The presence of positron makes the dispersion relation a cubic equation. Different roots of both real and imaginary parts of the RT mode are examined by applying the Cardano’s method of solving the cubic equation. The dispersion relation and the growth rates of RT instability are examined both analytically and numerically with effects of electron and positron density, and magnetic field variations. It is shown that the magnetic field and positron density have stabilizing effectuates on ERT mode while due to electron density the mode becomes unstable. The present work is antici-pated to be of physical relevance in the studies of laboratory laser-produced plasmas as well as in the study of compact magnetized astrophysical objects like white dwarfs.

关键词： Rayleigh-Taylor Instability Drift Wave Approximation Quantum Magneto Hydrodynamics Cardano’s Method

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Phase, Microstructure and Beneficiation of Manganese Ore by Acid Leaching

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Journal of Minerals and Materials Characterization and Engineering 2018年第1期6卷 60-71页

作者： sajad ali Yaseen Iqbal Kamran Ahmad Billal Afridi Materials Research Laboratory Department of Physics University of Peshawar Peshawar Pakistan

In this research work, sawdust was used as a reducing agent for sulphuric acid leaching of manganese ore from Prang Ghar, Lower Mohmand Agency, Pakistan. X-ray diffraction of the powdered sample indicated the presence of Hausmannite (Mn3O4), Calcium Aluminum Silicate Hydrate, Silica (SiO2) and Hematite (Fe2O3). X-ray diffraction and the energy dispersive spectroscopic analysis show that the manganese ore sample was siliceous in nature. In the present study, six process parameters were investigated i.e. the particle size of the ore, leaching temperature, time duration, Mn ore amount, sulphuric acid concentration and amount of sawdust. Manganese extraction of 88.93 (wt%) was achieved for a leaching time of 60 minutes at 120°C using 5% (v/v) H2SO4 concentration for 10 g Mn ore and 5 g sawdust. The results demonstrate that sawdust is a low cost, renewable and non-hazardous reducing agent in comparison to other available reagents.

关键词： Siliceous Manganese Ore Characterization Leaching Sawdust Sulfuric Acid

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Walking as soft mobility:A multi-criteria GISbased approach for prioritizing tourist routes

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Frontiers of Architectural Research 2023年第6期12卷 1080-1096页

作者： Ghazal Hassanshahi ali Soltani Maryam Roosta sajad Askari Department of Urban Planning and Design Shiraz UniversityShirazIran UniSA Business University of South AustraliaAdelaideAustralia Injury Studies Flinders Health and Medical Research InstituteBedford ParkAustralia Department of Civil Materials and Environmental Engineering(CME)University of Illinois ChicagoChicagoUnited States

Walking,as the main mode of soft mobility,has become an integral aspect of urban tourism.The development of pedestrian tourist routes plays a crucial role in enhancing the positive walking experience in urban tourist destinations.This research employs a hybrid multi-criteria decision-making(MCDM)with GIS to rank street segments,establishing walking-oriented tourist paths in Shiraz’s historic district,Iran.The initial steps involve identifying pivotal criteria through literature reviews and expert surveys.The Analytical Hierarchy Process(AHP)establishes criteria and sub-criteria weights using input from 30 experts.The Technique for Order Preference by Similarity to Ideal Solution(TOPSIS)then prioritizes street segments based on sub-criteria such as traffic safety,image ability and heritage assets,security,land use and activity,accessibility,comfort and convenience,and human scale.Furthermore,a Space Syntax analysis(SSA)is conducted to evaluate the morphology of the street network in the study area and identify streets with potential for pedestrian movement.By integrating these analyses,a prime corridor for a pedestrian tourist route is identified.This study offers planners and policymakers a valuable tool for pre-investment decision-making,aiding the promotion of walkability in tourist-centric areas.

关键词： Walking-based tourist route Slow tourism Soft mobility Multi-criteria decision-making(MCDM) Space Syntax Historic-heritage district

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A novel multi-stable sinusoidal chaotic map with spectacular behaviors

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Communications in Theoretical Physics 2023年第11期75卷 3-14页

作者： Ahmed M ali ali Sridevi Sriram Hayder Natiq Atefeh Ahmadi Karthikeyan Rajagopal sajad Jafari Department of Electronics Techniques Babylon Technical InstituteAl-Furat Al-Awsat Technical UniversityBabylon51001Iraq Al-Mustaqbal University College Babylon51001Iraq Centre for Computational Biology Chennai Institute of TechnologyChennai600069Tamil NaduIndia Department of Computer Technology Engineering College of Information TechnologyImam Ja’afar Al-Sadiq UniversityBaghdad10001Iraq Department of Biomedical Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran Centre for Nonlinear Systems Chennai Institute of TechnologyChennai600069Tamil NaduIndia Department of Electronics and Communications Engineering and University Centre of Research and Development Chandigarh UniversityMohali140413PunjabIndia Health Technology Research Institute Amirkabir University of Technology(Tehran Polytechnic)TehranIran

Chaotic behavior can be observed in continuous and discrete-time systems.This behavior can appear in one-dimensional nonlinear maps;however,having at least three state variables in flows is necessary.Due to the lower mathematical complexity and computational cost of maps,lots of research has been conducted based on them.This paper aims to present a novel one-dimensional trigonometric chaotic map that is multi-stable and can act attractively.The proposed chaotic map is first analyzed using a single sinusoidal function;then,its abilities are expanded to a map with a combination of two sinusoidal functions.The stability conditions of both maps are investigated,and their different behaviors are validated through time series,state space,and cobweb diagrams.Eventually,the influence of parameter variations on the maps’outputs is examined by one-dimensional and two-dimensional bifurcation diagrams and Lyapunov exponent spectra.Besides,the diversity of outputs with varying initial conditions reveals this map’s multi-stability.The newly designed chaotic map can be employed in encryption applications.

关键词： chaotic map discrete chaos sinusoidal map multi-stability dynamical analysis

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Corrosion behavior of composite coatings containing hydroxyapatite particles on Mg alloys by plasma electrolytic oxidation: A review

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Journal of Magnesium and Alloys 2023年第9期11卷 2999-3011页

作者： Arash Fattah-alhosseini Razieh Chaharmahali sajad alizad Mosab Kaseem Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006South Korea

Mg and its alloys have been introduced as promising biodegradable materials for biomedical implant applications due to their excellent biocompatibility, mechanical behavior, and biodegradability. However, their susceptibility to rapid corrosion within the body poses a significant challenge and restricts their applications. To overcome this issue, various surface modification techniques have been developed to enhance the corrosion resistance and bioactivity of Mg-based implants. PEO is a potent technique for producing an oxide film on a surface that significantly minimizes the tendency to corrode. However, the inevitable defects due to discharges and poor biological activity during the coating process remain a concern. Therefore, adding suitable particles during the coating process is a suitable solution. Hydroxyapatite(HAp)has attracted much attention in the development of biomedical applications in the scientific community. HAp shows excellent biocompatibility due to its similarity in chemical composition to the mineral portion of bone. Therefore, its combination with Mg-based implants through PEO has shown significant improvements in their corrosion resistance and bioactivity. This review paper provides a comprehensive overview of the recent advances in the preparation, characterization, corrosion behavior and bioactivity applications of HAp particles on Mg-based implants by PEO.

关键词： Mg and its alloys Hydroxyapatite Corrosion behavior Composite coatings Plasma electrolytic oxidation(peo)

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The Acoustic Performance of 3D Printed Multiple Jet Nozzles with DifferentConfigurations

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Sound & Vibration 2020年第1期54卷 43-55页

作者： ali Safari Variani ali Dastamoz sajad Zare Ahmad Nikpey Saeid Ahmadi Department of Occupational Health and Safety School of Public HealthQazvin University of Medical SciencesQazvinIran Department of Occupational Health and Safety School of Public HealthKerman University of Medical SciencesKermanIran

This work investigated multiple jet nozzles with various geometrical shape,number of exits,and material on reducing noise radiated from jet flows.Nozzles are categorized in two groups with few and many exit numbers,each with various exit shapes,slot and circular,and geometry.Firstly,nozzles are designed and then fabricated by a 3D printer,Form Labs,Form2USA,with polymeric resin.Also,the nozzle with the most noise reduction made of stainless steel.Noise and air thrust were measured at three air pressure gauges,3,5,7 BAR and directions from nozzle apex,30°,90°,135°.Nozzles with slot exit shape made of both plastic and stainless steel revealed the most noise reduction among all nozzles with few exit numbers,nearly 11–14 dB(A)and 11.5–15 dB(A),respectively.On average,slotted nozzle noise reduction was nearly 5–6 dB(A)more than finned nozzle.However,nozzles with more exit numbers,finned and finned-central exit,illustrated much more noise reduction than nozzles with few exit numbers,by almost 16–18 dB(A),they represented similar sound.All tested nozzles and open pipe demonstrated equal air thrust at each pressure gauges.The nozzles with slotted exit shape,either plastic or stainless steel,can provide reasonable noise reduction in comparison to other configuration with few exit numbers.In contrast,nozzles with more exit numbers demonstrated the most noise reduction.

关键词： Jet noise multiple jet nozzle noise reduction 3D design exit shape nozzle geometry

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A comprehensive study of two-phase flow and heat transfer of water/Ag nanofluid in an elliptical curved minichannel

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Chinese Journal of Chemical Engineering 2020年第2期28卷 383-402页

作者： sajad Mir Omid ali Akbari Davood Toghraie Ghanbarali Sheikhzadeh ali Marzban Saeid Mir Pouyan Talebizadehsardari Department of Mechanical Engineering Aligoudarz BranchIslamic Azad UniversityAligoudarzIran Young Researchers and Elite Club Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering University of KashanKashanIran Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Applied Sciences Ton Duc Thang UniversityHo Chi Minh CityVietnam

In this research,laminar flow and heat transfer of two-phase water/Ag nanofluid with 0–6%volume fraction of nanoparticles at Re=150–700 in a curved geometry are simulated using finite volume method.Studied geometry is an elliptical curved minichannel with curvature angle of 180°.Forced and natural flow of two-phase nanofluid is simulated at Gr=15000,35000 and 75000.For estimation of nanofluid flow behavior,two-phase mixture method is used.The second-order discretization and SIMPLEC algorithm are used for solving governing equations.The results indicate that the increase of volume fraction of nanoparticles leads to the enhancement of the temperature of central line of flow.The increase of Grashof number(Gr^75000)has a great effect on reduction of dimensionless temperature in central line of flow.Creation of thermal boundary layer at Re=500 and after the angle of 30°becomes significant.In low Grashof numbers(Gr^15000),due to the great effects of temperature gradients close to wall,these regions have significant entropy generation.

关键词： Elliptical minichannel Mixed convection Numerical study Nanofluid Finite volume method Friction factor

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