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An investigation of planetary nebulae accompanying PG 1159 central stars,based on Gaia Dr2 measurements

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research in Astronomy and Astrophysics 2021年第6期21卷 397-402页

作者： Alaa Ali Wedad r.alharbi Department of Astronomy Faculty of ScienceCairo University12613 GizaEgypt Department of Physics College of ScienceUniversity of Jeddah23890 JeddahSaudi Arabia

This article discusses the physical and kinematical characteristics of planetary nebulae accompanying PG 1159 central *** study is based on the parallax and proper motion measurements recently offered by the Gaia space *** approaches were used to investigate the kinematical properties of the *** results revealed that most of the studied nebulae arise from progenitor stars in the mass range 0.9-1.75 M⊙.Furthermore,they tend to live within the Galactic thick disk and move with an average peculiar velocity of 61.7±19.2 km s^(-1) at a mean vertical height of 469±79 *** locations of the PG 1159 stars on the H-r diagram indicate that they have an average final stellar mass and evolutionary age of 0.58±0.08 M⊙and 25.5±5.3×103 yr,*** found a good agreement between the mean evolutionary age of the PG 1159 stars and the mean dynamical age of their companion planetary nebulae(28.0±6.4×103 yr).

关键词： planetary nebulae:general methods:kinematics stars:individual(PG 1159)

Tuberculous esophagomediastinal fistula with concomitant mediastinal bronchial artery aneurysm-acute upper gastrointestinal bleeding: A case report

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World Journal of Gastroenterology 2019年第17期25卷 2144-2148页

作者： Sultan r alharbi Interventional radiology Unit King Saud University Medical CityCollage of MedicineKing Saud University

BACKGrOUND Esophagomediastinal fistula is a very rare complication of tuberculosis in otherwise healthy adults, and mediastinal bronchial artery aneurysm is even rarer. In this case report, we describe a rare case of tuberculosis complication that presented with acute upper gastrointestinal(GI) bleeding. It also highlights the benefits of chest computed tomography(CT) as an excellent adjunct diagnostic tool to endoscopy and bronchoscopy and the role of trans-arterial embolization as a minimal invasive therapy alternative to *** SUMMArY A 19-year-old medically free male patient presented with acute multiple episodes of hematemesis for 1 d. Upper GI endoscopy, bronchoscopy, and chest CT with IV contrast confirmed esophagomediastinal fistula with mediastinal bronchial artery aneurysm. After resuscitating patient with IV fluid and blood product transfusion, trans catheter embolization was performed for mediastinal bronchial artery *** We successfully treated a patient with acute upper GI bleeding due to tuberculous esophagomediastinal fistula and mediastinal bronchial artery aneurysm using transcatheter coil embolization.

关键词： Mediastinal bronchial artery aneurysm Esophagomediastinal fistula Upper gastrointestinal bleeding Mediastinal tuberculosis Case report

Novel Computer-Aided Diagnosis System for the Early Detection of Alzheimer’s Disease

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Computers, Materials & Continua 2023年第3期74卷 5483-5505页

作者： Meshal alharbi Shabana r.Ziyad Department of Computer Science College of Computer Engineering and SciencesPrince Sattam Bin Abdulaziz UniversityAl KharjSaudi Arabia

Aging is a natural process that leads to debility,disease,and ***’s disease(AD)causes degeneration of the brain cells leading to cognitive decline and memory loss,as well as dependence on others to fulfill basic daily *** is the major cause of ***-aided diagnosis(CADx)tools aid medical practitioners in accurately identifying diseases such as AD in *** study aimed to develop a CADx tool for the early detection of AD using the Intelligent Water Drop(IWD)algorithm and the random Forest(rF)*** IWD algorithm an efficient feature selection method,was used to identify the most deterministic features of AD in the *** is an ensemble method that leverages multiple weak learners to classify a patient’s disease as either demented(DN)or cognitively normal(CN).The proposed tool also classifies patients as mild cognitive impairment(MCI)or *** dataset on which the performance of the proposed CADx was evaluated was sourced from the Alzheimer’s Disease Neuroimaging Initiative(ADNI).The rF ensemble method achieves 100%accuracy in identifying DN patients from CN *** classification accuracy for classifying patients as MCI or CN is 92%.This study emphasizes the significance of pre-processing prior to classification to improve the classification results of the proposed CADx tool.

关键词： Alzheimer’s disease dementia mild cognitive impairment computer-aided diagnosis intelligent water drop algorithm random forest

Coarse to Fine: The role of Severe Plastic Deformation in Advancing Titanium-Based Medical Implants - A Comprehensive review

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 295-306页

作者： Dragana r Mihajlović Bojan I Međo Ivana Lj Cvijović-Alagić Veljko r Djokić Faculty of Technology and Metallurgy University of BelgradeKarnegijeva 411120 BelgradeSerbia Vinča Institute of Nuclear Sci-ences-National Institute of the republic of Serbia University of Belgrade11001BeogradSerbia Innovation Centre of the Faculty of Technology and Metallurgy Karnegijeva 411120 BelgradeSerbia

This paper describes severe plastic deformation(SPD)procedures,which are utilized to form an ultrafine-grained structure in metallic *** the SPD process,a solid material sample is subjected to very high loads without a significant change in sample *** the present work,the high-pressure torsion(HPT)process,as one of the SPD techniques,which achieves a high degree of deformation and ensures refinement of the microstructure,will be discussed in more *** that grain size control is accepted as a method to obtain materials with desired characteristics,an overview of the properties of ultrafine-grained titanium-based biomaterials to be used in medicine is ***,particular attention is dedicated to the influences of HPT process parameters,primarily hydrostatic pressure,and number of revolutions during torsion,on the grain size and physical and mechanical characteristics(modulus of elasticity,microhardness,and tensile properties),corrosion resistance,and biocompatibility of the titanium-based biomaterials.A review of the literature indicates that titanium-based materials obtained by the SPD process show improved mechanical and physical properties without losing biocompatibility and corrosion resistance,which suggests that these methods of obtaining implants are something that should be further developed in the future.

关键词： high-pressure torsion process ultrafine-grained titanium-based materials electrochemical anodization physical properties mechanical properties

Impact Assessment of Plug-in Electric Vehicle Charging Locations on Power Systems with Integrated Wind Farms Incorporating Dynamic Thermal Limits

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 710-718页

作者： Bader alharbi Dilan Jayaweera Department of Electronic Electrical and Systems EngineeringUniversity of BirminghamBirminghamUK Department of Electrical Engineering College of Engineering in Majmaah UniversityAl-Majmaah 11952Saudi Arabia

The increased presence of electric vehicle charging locations in a power system with high penetration of intermittent wind power potentially leads to operation complexities resulting in abnormal *** paper proposes an innovative framework for assessing the impact of plug-in electric vehicle(PEV)charging locations on a power system with integrated wind farms,incorporating dynamic thermal limits(DTLs).The framework comprises Monte Carlo simulation,which is embedded with stochastic modeling of various uncertainties under the key operating *** part of the modeling framework,the transmission lines are ranked in accordance with the lowest level of expected energy not *** PEV charging demand is then modeled by incorporating DTLs and applied to the least stressed transmission lines,following the IEEE 738-2006 *** new assessment framework is investigated using an IEEE 24-bus test *** results demonstrate that applying DTLs on the least stressed transmission lines in conjunction with the integration of decentralized wind farms and strategic charging location of PEVs significantly improves the security of the energy supply and considerably reduces interruption costs,as opposed to not having such a framework.

关键词： Dynamic thermal limit impact assessment Monte Carlo simulation plug-in electric vehicle wind farm

Emerging potential of progranulin-dependent SorCS2 signaling in healthy and diseased nervous systems

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Neural regeneration research 2025年第9期20卷 2591-2593页

作者： Alena Salasova Anders Nykjær Danish research Institute of Translational Neuroscience DANDrITE-Nordic EMBL Partnership for Molecular Medicine and Centre of Excellence PROMEMODepartment of BiomedicineAarhus UniversityAarhusDenmark

The formation of the mammalian nervous system and its maturation into sensory,motor,cognitive,and behavioral circuits is a complex process that begins during early embryogenesis and lasts until young *** neurodevelopm... 详细信息

关键词： progr jointly CS2

A Study of Traveling Wave Structures and Numerical Investigation of Two-Dimensional riemann Problems with Their Stability and Accuracy

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Computer Modeling in Engineering & Sciences 2023年第3期134卷 2193-2209页

作者： Abdulghani ragaa alharbi Department of Mathematics College of ScienceTaibah UniversityAl-Madinah Al-Munawarah42353Saudi Arabia

The riemann wave system has a fundamental role in describing waves in various nonlinear natural phenomena,for instance,tsunamis in the *** paper focuses on executing the generalized exponential rational function approach and some numerical methods to obtain a distinct range of traveling wave structures and numerical results of the two-dimensional riemann *** stability of obtained traveling wave solutions is analyzed by satisfying the constraint conditions of the Hamiltonian *** simulations are investigated via the finite difference method to verify the accuracy of the obtained *** extract the approximation solutions to the underlying problem,some ODE solvers in FOrTrAN software are applied,and outcomes are shown *** stability and accuracy of the numerical schemes using Fourier’s stabilitymethod and error analysis,respectively,to increase the reassurance are investigated.A comparison between the analytical and numerical results is obtained and graphically *** proposed methods are effective and practical to be applied for solving more partial differential equations(PDEs).

关键词： The riemann wave equation Hamiltonian system solitary solutions numerical solutions stability accuracy

Security Strategy of Digital Medical Contents Based on Blockchain in Generative AI Model

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Computers, Materials & Continua 2025年第1期82卷 259-278页

作者： Hoon Ko Marek r.Ogiela Division of Computer Science and Engineering Sunmoon UniversityAsan31460Republic of Korea AGH University of Krakow Cryptography and Cognitive Informatics LaboratoryKrakow30-059Poland

This study presents an innovative approach to enhancing the security of visual medical data in the generative AI environment through the integration of blockchain *** combining the strengths of blockchain and generative AI,the research team aimed to address the timely challenge of safeguarding visual medical *** participating researchers conducted a comprehensive analysis,examining the vulnerabilities of medical AI services,personal information protection issues,and overall security *** multi faceted exploration led to an indepth evaluation of the model’s performance and ***,the correlation between accuracy,detection rate,and error rate was *** analysis revealed insights into the model’s strengths and limitations,while the consideration of standard deviation shed light on the model’s stability and performance *** study proposed practical improvements,emphasizing the reduction of false negatives to enhance detection rate and leveraging blockchain technology to ensure visual data integrity in medical *** blockchain to generative AI-created medical content addresses key personal information protection *** utilizing the distributed ledger system of blockchain,the research team aimed to protect the privacy and integrity of medical data especially medical *** approach not only enhances security but also enables transparent and tamperproof ***,the use of generative AI models ensures the creation of novel medical content without compromising personal information,further safeguarding patient *** conclusion,this study showcases the potential of blockchain-based solutions in the medical field,particularly in securing sensitive medical data and protecting patient *** proposed approach,combining blockchain and generative AI,offers a promising direction toward more robust and secure medical content *** research and advancements

关键词： Digitalmedical content medical diagnostic visualization security analysis generativeAI blockchain vulnerability pattern recognition

A Learning Model to Detect Android C&C Applications Using Hybrid Analysis

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Computer Systems Science & Engineering 2022年第12期43卷 915-930页

作者： Attia Qammar Ahmad Karim Yasser alharbi Mohammad Alsaffar Abdullah alharbi Department of Information Technology Bahauddin Zakariya UniversityMultan60000Pakistan College of Computer Science and Engineering University of HailHa’il81451Saudi Arabia

Smartphone devices particularly Android devices are in use by billions of people everywhere in the ***,this increasing rate attracts mobile botnet attacks which is a network of interconnected nodes operated through the command and control(C&C)method to expand malicious *** present,mobile botnet attacks launched the Distributed denial of services(DDoS)that causes to steal of sensitive data,remote access,and spam generation,***quently,various approaches are defined in the literature to detect mobile botnet attacks using static or dynamic *** this paper,a novel hybrid model,the combination of static and dynamic methods that relies on machine learning to detect android botnet applications is ***,results are evaluated using machine learning *** random Forest(rF)classifier outperform as compared to other ML techniques i.e.,Naïve Bayes(NB),Support Vector Machine(SVM),and Simple Logistic(SL).Our proposed framework achieved 97.48%accuracy in the detection of botnet ***,some future research directions are highlighted regarding botnet attacks detection for the entire community.

关键词： Android botnet botnet detection hybrid analysis machine learning classifiers mobile malware