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Research in Astronomy and Astrophysics 2023年第6期23卷 1-11页

作者： majid Bakhtiari Assistant Professor School of Advanced TechnologiesIran University of Science and TechnologyNarmakTehran 16844Iran

The influence of a third-body's orbital elements on the second-body's motion in a hierarchical triple system is a crucial problem in *** prolonged evaluation studies have focused on a distant zero-inclined *** study presents a new perspective on second-body motion equations that addresses a perturbing-body in an elliptic orbit derived with consideration of the axial-tilt(obliquity)of the *** proposed model is compared by the dual-averaged method and the N-body problem *** validation,a generalized threebody model is derived to investigate the effects of the third-body's orbital elements on secondary-body motion *** proposed model considers short-time oscillations that affect secular evaluation and applies to exoplanets with all the primary and third body eccentricities,inclinations,and mass *** is shown that the obliquity of the primary(or third-body's inclination)must be considered for precise long-term assessment,even in highly-hierarchical systems.

关键词： celestial mechanics planets and satellites:dynamical evolution and stability Planetary Systems gravitation

Fabrication of Porous Mg-Zn Scaffold through Modified Replica Method for Bone Tissue Engineering

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Journal of Bionic Engineering 2018年第5期15卷 907-913页

作者： Amir Hamed Aghajanian Bijan Abbasi khazaei Mohammad Khodaei Mohammad Rafienia Department of Materials Engineering Faculty of Engineering Razi University Kermanshah Iran Dental Research Center School of Dentistry Isfahan University of Medical Sciences Isfahan 81746-73461 Iran Biosensor Research Center lsfahan University of Medical Sciences Isfahan 81744176 Iran

Biodegradable scaffolds are essential parts in hard tissue engineering. A highly porous magnesium-zinc （Mg-Zn 4 wt.%） scaffold with different Mg-Zn powder to liquid media ratios （50 wt.%, 70 wt.% and 90 wt.%） and different concentrations of ethanol （0 vol.%, 10 vol.%, 20 vol.% and 40 vol.%） were prepared through modified replica method. The mechanical properties were assessed through compression test and the structures of scaffolds were examined by Scanning Electron Microscope （SEM）. Results show that, the increase in Mg-Zn powder to liquid media ratio （50 wt.% to 90 wt.%） in ethanol free slurry, increases the thickness of struts （37 lam to 74 lam） and the plateau stress （0.5 MPa to 1.4 MPa）. The results obtained from X-ray Diffractometry （XRD） and compression test indicate that consuming ethanol in liquid media of replica, results in higher plateau stress by 46% due to less Mg-water reaction and no formation of Mg（OH）2 in the scaffold. The results of porosity measurement indicate that water-ethanol mixture composition and different solid fractions have no significant effects on true and apparent porosities of the fabricated scaffolds.

关键词： porous magnesium scaffold replica method Mg-Zn powder to water ratio mechanical properties

Analyzing the Impact of Blockchain Models for Securing Intelligent Logistics through Unified Computational Techniques

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Computers, Materials & Continua 2023年第12期77卷 3943-3968页

作者： Mohammed S.Alsaqer majid H.Alsulami Rami N.Alkhawaji Abdulellah A.Alaboudi College of Computer Science King Khalid UniversityAbha62529Saudi Arabia Applied College Shaqra UniversityShaqra11961Saudi Arabia University College of Umluj University of TabukUmluj48335Saudi Arabia

Blockchain technology has revolutionized conventional *** success of blockchain can be attributed to its distributed ledger characteristic,which secures every record inside the ledger using cryptography rules,making it more reliable,secure,and *** is evident by the significant impact that the use of this technology has had on people connected to digital spaces in the present-day ***,it has been proven that blockchain technology is evolving from new perspectives and that it provides an effective mechanism for the intelligent transportation system *** realize the full potential of the accurate and efficacious use of blockchain in the transportation sector,it is essential to understand the most effective mechanisms of this technology and identify the most useful *** a result,the present work offers a priority-based methodology that would be a useful reference for security experts in managing blockchain technology and its *** study uses the hesitant fuzzy analytical hierarchy process for prioritizing the different blockchain *** on the findings of actual performance,alternative solution A1 which is Private Blockchain model has an extremely high level of security *** accuracy of the results has been tested using the hesitant fuzzy technique for order of preference by similarity to the ideal solution *** study also uses guidelines from security researchers working in this domain.

关键词： Intelligent transportation system security engineering smart systems decision making

Resource Management in UAV Enabled MEC Networks

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Computers, Materials & Continua 2023年第3期74卷 4847-4860页

作者： Muhammad Abrar Ziyad M.Almohaimeed Ushna Ajmal Rizwan Akram Rooha Masroor Muhammad majid Hussain Bahauddin Zakariya University Department of Electrical EngineeringMultan60000Pakistan Department of Electrical Engineering College of EngineeringQassim UniversityBuraidah51452Saudi Arabia COMSATS University WAH Campus Islamabad47040Pakistan Department of Electrical and Electronics Engineering University of South WalesPontypirddCF371DLUK

Mobile edge cloud networks can be used to offload computationally intensive tasks from Internet of Things(IoT)devices to nearby mobile edge servers,thereby lowering energy consumption and response time for ground mobile users or IoT *** of Unmanned Aerial Vehicles(UAVs)and the mobile edge computing(MEC)server will significantly benefit small,battery-powered,and energy-constrained devices in 5G and future wireless *** address the problem of maximising computation efficiency in U-MEC networks by optimising the user association and offloading indicator(OI),the computational capacity(CC),the power consumption,the time duration,and the optimal location planning *** is possible to assign some heavy tasks to the UAV for faster processing and small ones to the mobile users(MUs)*** paper utilizes the k-means clustering algorithm,the interior point method,and the conjugate gradient method to iteratively solve the non-convex multi-objective resource allocation *** to simulation results,both local and offloading schemes give optimal solution.

关键词： Mobile edge computing internet of things UAVs ground mobile users

An Efficient Internet Traffic Classification System Using Deep Learning for IoT

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Computers, Materials & Continua 2022年第4期71卷 407-422页

作者： Muhammad Basit Umair Zeshan Iqbal Muhammad Bilal Jamel Nebhen Tarik Adnan Almohamad Raja majid Mehmood Department of Computer Science University of Engineering and TechnologyTaxila47050Pakistan Division of Computer and Electronics Systems Engineering Hankuk University of Foreign StudiesYongin-siKorea Electrical-Electronics Engineering Department Faculty of EngineeringKarabük University78050KarabükTurkey Prince Sattam bin Abdulaziz University College of Computer Engineering and SciencesAlkharj11942Saudi Arabia Information and Communication Technology Department School of Electrical and Computer EngineeringXiamen University MalaysiaSepang43900Malaysia

Internet of Things(IoT)defines a network of devices connected to the internet and sharing a massive amount of data between each other and a central *** IoT devices are connected to a network therefore prone to *** management tasks and network operations such as security,intrusion detection,Quality-of-Service provisioning,performance monitoring,resource provisioning,and traffic engineering require traffic *** to the ineffectiveness of traditional classification schemes,such as port-based and payload-based methods,researchers proposed machine learning-based traffic classification systems based on shallow neural ***,machine learning-based models incline to misclassify internet traffic due to improper feature *** this research,an efficient multilayer deep learning based classification system is presented to overcome these challenges that can classify internet *** examine the performance of the proposed technique,Moore-dataset is used for training the *** proposed scheme takes the pre-processed data and extracts the flow features using a deep neural network(DNN).In particular,the maximum entropy classifier is used to classify the internet *** experimental results show that the proposed hybrid deep learning algorithm is effective and achieved high accuracy for internet traffic classification,i.e.,99.23%.Furthermore,the proposed algorithm achieved the highest accuracy compared to the support vector machine(SVM)based classification technique and k-nearest neighbours(KNNs)based classification technique.

关键词： Deep learning internet traffic classification network traffic management QoS aware application classification

Oxygen redox chemistry in lithium-rich cathode materials for Li-ion batteries:Understanding from atomic structure to nano-engineering

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Nano Materials Science 2022年第4期4卷 322-338页

作者： majid Farahmandjou Shuoqing Zhao Wei-Hong Lai Bing Sun Peter.H.L.Notten Guoxiu Wang Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneySydneyNSW2007Australia Department of Chemical Engineering and Chemistry Eindhoven University of Technology5600MBEindhoventhe Netherlands Fundamental Electrochemistry(IEK9) Forschungszentrum JülichD-52425JülichGermany

Lithium-rich oxide compounds have been recognized as promising cathode materials for high performance Li-ion batteries,owing to their high specific ***,it remains a great challenge to achieve the fully reversible anionic redox reactions to realize high capacity,high stability,and low voltage hysteresis for lithiumrich cathode ***,it is critically important to comprehensively understand and control the anionic redox chemistry of lithium-rich cathode materials,including atomic structure design,and nano-scale materials engineering ***,we summarize the recent research progress of lithium-rich cathode materials with a focus on redox ***,we highlight the oxygen-based redox reactions in lithium-rich metal oxides,with critical views of designing next generation oxygen redox lithium cathode ***,we purposed the most promising strategies for improving the performances of lithium-rich cathode materials with a technology-spectrum from the atomic scale to nano-scale.

关键词： Oxygen redox chemistry Lithium-rich cathode Li-ion batteries Atomic structure Nano-engineering

Performance assessment of a spiral methanol to hydrogen fuel processor for fuel cell applications

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Journal of Natural Gas Chemistry 2012年第5期21卷 526-533页

作者： Foad Mehri majid Taghizadeh Chemical Engineering Department Babol University of TechnologyP.O.Box 484*** BabolIran

A novel design of plate-type microchannel reactor has been developed for fuel cell-grade hydrogen *** Cu/Zn/Al2O3 was used as catalyst for the reforming reaction,and its effectiveness was evaluated on the mole fraction of products,methanol conversion,hydrogen yield and the amount of carbon monoxide under various operating ***,0.5 wt% Ru/Al2O3 as methanation catalyst was prepared by impregnation method and coupled with MSR step to evaluate the capability of methanol processor for CO *** on the experimental results,the optimum conditions were obtained as feed flow rate of 5mL/h and temperature of 250℃,leading to a low CO selectivity and high H2 *** designed reformer with catalyst coated layer was compared with the conventional packed bed reformer at the same operating *** constructed fuel processor had a good performance and excellent capability for on-board hydrogen production.

关键词： spiral fuel processor hydrogen fuel cell methanol steam reforming

Energy behavior of Boris algorithm

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Chinese Physics B 2021年第5期30卷 492-498页

作者： Abdullah Zafar majid Khan Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan

Boris numerical scheme due to its long-time stability,accuracy and conservative properties has been widely applied in many studies of magnetized *** algorithms conserve the phase space volume and hence provide accurate charge particle ***,this algorithm does not conserve the energy in some special electromagnetic configurations,particularly for long simulation ***,we empirically analyze the energy behavior of Boris algorithm by applying it to a 2D autonomous *** energy behavior of the Boris method is found to be strongly related to the integrability of our Hamiltonian *** find that if the invariant tori is preserved under Boris discretization,the energy error can be bounded for an exponentially long time,otherwise the said error will show a linear *** the contrary,for a non-integrable Hamiltonian system,a random walk pattern has been observed in the energy error.

关键词： Boris algorithm invariant tori chaotic system Hénon-Heiles potential

Efficiency enhancement of building multi-layer solar collector with SiO2–TiO2 hybrid nanofluids

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Building Simulation 2023年第10期16卷 1851-1862页

作者： N.N.M.Zawawi W.H.Azmi Z.A.A.majid R.A.Rahim H.M.Ali Lebuhraya Tun Razak Centre for Research in Advanced Fluid and Processes26300GambangKuantanPahangMalaysia Faculty of Mechanical and Automotive Engineering Technology Universiti Malaysia PahangPekanPahang26600Malaysia Kulliyyah of Allied Health Sciences International Islamic University of MalaysiaBandar Indera Mahkota25200KuantanPahangMalaysia ECE Department Kulliyyah of EngineeringInternational Islamic University MalaysiaJalan GombakKuala LumpurMalaysia Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Due to the depletion of conventional energy sources and its limitless resources,solar energy is currently being considered as a viable alternative,especially for water heating *** thermal performance of multilayer solar collectors for water heating systems can be improved further by introducing hybrid nanofluids as advanced *** study demonstrates the utilisation of hybrid nanofluids in heating systems by employing a multilayer absorber solar *** SiO2–TiO2 hybrid nanofluids at volume concentrations up to 2.0%were tested at various flow rates(1.7 to 3.7 LPM)and solar radiation intensities(250 to 1000 W/m2).The thermal performance of the solar collector was assessed by measuring the temperature variation,heat loss,and overall efficiency of the *** the optimal volume concentration,the temperature difference for solar collectors employing SiO2–TiO2 hybrid nanofluids increased *** optimal volume concentration of 1.5%yields a maximum temperature difference of 9.5°*** addition,the efficiency and fluid temperature of the solar collector containing hybrid nanofluids have been enhanced by 22%and 37%,*** SiO2–TiO2 hybrid nanofluids with the optimal volume concentration of 1.5%were therefore recommended for maximum efficiency in the solar collector.

关键词： solar collector hybrid nanofluids solar water heating system solar simulator thermal efficiency

New Painlevé Integrable(3+1)-Dimensional Combined pKP–BKP Equation:Lump and Multiple Soliton Solutions

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Chinese Physics Letters 2023年第12期40卷 19-26页

作者： Abdul-majid Wazwaz Department of Mathematics Saint Xavier UniversityChicagoIL 60655USA

We introduce a new form of the Painlevé integrable(3+1)-dimensional combined potential Kadomtsev–Petviashvili equation incorporating the B-type Kadomtsev–Petviashvili equation(pKP–BKP equation). We perform the Painlevé analysis to emphasize the complete integrability of this new(3+1)-dimensional combined integrable equation. We formally derive multiple soliton solutions via employing the simplified Hirota bilinear method. Moreover, a variety of lump solutions are determined. We also develop two new(3+1)-dimensional pKP–BKP equations via deleting some terms from the original form of the combined p KP–BKP equation. We emphasize the Painlevé integrability of the newly developed equations, where multiple soliton solutions and lump solutions are derived as well. The derived solutions for all examined models are all depicted through Maple software.

关键词： equation method integrable