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Improvement of in vitro corrosion, wear, and mechanical properties of newly developed Ti alloy by thermal treatment for dental applications

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 952-966页

作者： Mohamed HUSSEIN Akeem YADESINA Madhan KUMAR Mohamed AZEEM Ahmad SOROUR nasser al-AQEELI Center of Research Excellence in Corrosion King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Department of Mechanical Engineering King Fahd University of Petroleum&MineralsDhahran 31261Saudi Arabia Mechanical Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia

The effects of thermal treatments on the structure, mechanical properties, wear resistance, and in vitro corrosion protection in artificial saliva(AS) were investigated for a newly developed Ti20 Nb13 Zr(TNZ) alloy. XRD and SEM analyses were used for structural and microstructural analysis. The in vitro corrosion properties of the samples were investigated using electrochemical impedance spectroscopy and linear polarization resistance techniques up to an immersion time of 168 h. The tribological characteristics were evaluated with a linear reciprocating tribometer. SEM analysis showed that solution treatment and aging influenced the size and distribution of α phase. The air-cooled and aged samples exhibited the highest microhardness and macrohardness, for which the wear resistances were 25% and 30% higher than that of the untreated sample, respectively. The cooling rate significantly influenced the corrosion resistance of the TNZ samples. The treated samples showed a reduced corrosion rate(50%) for long immersion time up to 168 h in AS. The furnace-cooled and aged samples exhibited the highest corrosion resistance after 168 h of immersion in AS. Among the treated samples, the aged sample showed enhanced mechanical properties, wear behavior, and in vitro corrosion resistance in AS.

关键词： heat treatment Ti-based alloy microstructure mechanical properties wear corrosion biomaterials

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Modelling and control of a grid-connected AC microgrid with the integration of an electric vehicle

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Clean Energy 2023年第4期7卷 707-720页

作者： Youssef Akarne Ahmed Essadki Tamou nasser Hammadi Laghridat Higher National School of Arts and Crafts(ENSAM) Mohammed V UniversityRabatMorocco National High School for Computer Science and Systems Analysis(ENSIAS) Mohammed V UniversityRabatMorocco

The purpose of this paper is to propose an efficient model and a robust control that ensures good power quality for the AC microgrid(MG)connected to the utility grid with the integration of an electric vehicle(EV).The MG consists of two renewable energy sources:a photovoltaic system(PVS)and a wind turbine system(WTS)based on a permanent magnet synchronous generator(PMSG),with the integration of an *** sources are used to supply active and reactive power to the AC bus and the utility *** power point tracking(MPPT)based on the perturb-and-observe(PO)method is used to increase the efficiency of the photovoltaic modules and improve overall *** MG system includes a 2-MW WTS,a 100-kW PVS and 12 kW provided by the *** validate the performance of the proposed system,a series of simulations were conducted using the MATLAB/Simulink?*** results demonstrate that the proposed system ensures high performance in terms of power quality,system stability,power tracking and safe integration of the EV.

关键词： microgrid wind turbine system photovoltaic system electric vehicle grid-to-vehicle vehicle-to-grid control systems

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Effect of Notch Location on Fatigue Life Prediction of Strength Mismatched HSLA Steel Weldments

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Journal of Materials Science & Technology 2004年第2期20卷 129-135页

作者： S.Ravi V.Balasubramanian S.Nemat nasser Department of Manufacturing Engineering Annamalai University Annamalainagar-608 002. Tamil Nadu IndiaDepartment of Manufacturing Engineering Annamalai University Annamalainagar-608 002. Tamil Nadu IndiaCentre of Excellence for Advanced Materials University of California at San Diego La Jolla CA 92093-0416 USA

Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the availability of the filler material. In the present investigation, the fatigue crack growth behaviour of weld metal (WM) and heat affected zone (HAZ) regions of under matched (UM), equal matched (EM) and over matched (OM) joints has been studied. The base material used in this investigation is HSLA-80 steel of weldable grade. Shielded metal arc welding (SMAW) process has been used to fabricate the butt joints. Centre cracked tension (CCT) specimen has been used to evaluate the fatigue crack growth behaviour of the welded joints. Fatigue crack growth experiments have been conducted using servo hydraulic controlled fatigue testing machine at constant amplitude loading (R=0).A method has been proposed to predict the fatigue life of HSLA steel welds using fracture mechanics approach by incorporating influences of mismatch ratio (MMR) and notch location.

关键词： Shielded metal arc welding High strength low alloy steel Mismatch ratio Notch location Fatigue crack growth Fatigue life

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Characterization of low-purity clays for geopolymer binder formulation

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International Journal of Minerals,Metallurgy and Materials 2014年第6期21卷 609-619页

作者： nasser Y.Mostafa Q.Mohsen A.El-maghraby Materials and Corrosion Lab (MCL) Department of Chemistry Faculty of Science Taif University Department of Chemistry Faculty of Science Suez Canal University Refractory & Ceramics Department National Research CenterDokki 12622 Cairo Egypt

The production of geopolymer binders from low-purity clays was investigated. Three low-purity clays were calcined at 750℃ for 4 h. The calcined clays were chemically activated by the alkaline solutions of NaOH and Na2SiO3. The compressive strength was measured as a function of curing time at room temperature and 85℃. The results were compared with those of a pure kaolin sample. An amorphous aluminosilicate polymer was formed in all binders at both processing temperatures. The results show that, the mechanical properties depend on the type and amount of active aluminum silicates in the starting clay material, the impurities, and the processing temperature.

关键词： geopolymers microstructure X-ray diffraction compressive strength clay

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Computational Linguistics with Optimal Deep Belief Network Based Irony Detection in Social Media

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Computers, Materials & Continua 2023年第5期75卷 4137-4154页

作者： Manar Ahmed Hamza Hala J.alshahrani Abdulkhaleq Q.A.Hassan Abdulbaset Gaddah nasser allheeib Suleiman ali alsaif Badriyya B.al-onazi Heba Mohsen Department of Computer and Self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharjSaudi Arabia Department of Applied Linguistics College of LanguagesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of English College of Science and Arts at MahayilKing Khalid UniversityAbha62217Saudi Arabia Department of Computer Sciences College of Computing and Information SystemUmm Al-Qura UniversityMakkah24211Saudi Arabia Department of Information Systems College of Computer and Information SciencesKing Saud UniversityRiyadhSaudi Arabia Department of Computer Deanship of Preparatory Year and Supporting StudiesImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Department of Language Preparation Arabic Language Teaching InstitutePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Computer Science Faculty of Computers and Information TechnologyFuture University in EgyptNew Cairo11835Egypt

Computational linguistics refers to an interdisciplinary field associated with the computational modelling of natural language and studying appropriate computational methods for linguistic *** number of social media users has been increasing over the last few years,which have allured researchers’interest in scrutinizing the new kind of creative language utilized on the Internet to explore communication and human opinions in a *** and sarcasm detection is a complex task inNatural Language Processing(NLP).Irony detection has inferences in advertising,sentiment analysis(SA),and opinion *** the last few years,irony-aware SA has gained significant computational treatment owing to the prevalence of irony in web ***,this study develops Computational Linguistics with Optimal Deep Belief Network based Irony Detection and Classification(CLODBN-IRC)model on social *** presented CLODBN-IRC model mainly focuses on the identification and classification of irony that exists in social *** attain this,the presented CLODBN-IRC model performs different stages of pre-processing and TF-IDF feature *** irony detection and classification,the DBN model is exploited in this *** last,the hyperparameters of the DBN model are optimally modified by improved artificial bee colony optimization(IABC)*** experimental validation of the presentedCLODBN-IRCmethod can be tested by making use of benchmark *** simulation outcomes highlight the superior outcomes of the presented CLODBN-IRC model over other approaches.

关键词： Computational linguistics natural language processing deep learning irony detection social media

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Non-alcoholic steatohepatitis or metabolic-associated fatty liver:time to change

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Hepatobiliary Surgery and Nutrition 2021年第1期10卷 123-125页

作者： Gamal Shiha nasser Mousa Egyptian Liver Research Institute and Hospital(ELRIAH) MansouraEgypt Hepatology and Gastroenterology Unit Internal Medicine Department Tropical Medicine Department Faculty of MedicineMansoura UniversityMansouraEgypt

Non-alcoholic fatty liver disease(NAFLD)is a range of liver disease characterized by the occurrence of steatosis in greater than 5%of hepatocytes of people who drink tiny or no *** comprises,a benign non-alcoholic fatty liver(NAFL),and the more serious non-alcoholic steatohepatitis(NASH)described by steatosis,hepatocellular ballooning,lobular inflammation and lastly cirrhosis(1).

关键词： balloon NAFLD liver

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Visual inspection of aircraft skin:Automated pixel-level defect detection by instance segmentation

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Chinese Journal of Aeronautics 2022年第10期35卷 254-264页

作者： Meng DING Boer WU Juan XU Abdul nasser KASULE Hongfu ZUO College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Civil Aircraft Health Monitoring and Intelligent Maintenance of CAAC Nanjing 210016China

Skin defect inspection is one of the most significant tasks in the conventional process of aircraft *** paper proposes a vision-based method of pixel-level defect detection,which is based on the Mask Scoring ***,an attention mechanism and a feature fusion module are introduced,to improve feature ***,a new classifier head—consisting of four convolutional layers and a fully connected layer—is proposed,to reduce the influence of information around the area of the ***,to evaluate the proposed method,a dataset of aircraft skin defects was constructed,containing 276 images with a resolution of 960×720 *** results show that the proposed classifier head improves the detection and segmentation accuracy,for aircraft skin defect inspection,more effectively than the attention mechanism and feature fusion *** with the Mask R-CNN and Mask Scoring R-CNN,the proposed method increased the segmentation precision by approximately 21%and 19.59%,*** results demonstrate that the proposed method performs favorably against the other two methods of pixellevel aircraft skin defect detection.

关键词： Aircraft skin Automatic non-destructive testing Defect inspection Instance segmentation Machine vision

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Remote Sensing Image Encryption Using Optimal Key Generation-Based Chaotic Encryption

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Computer Systems Science & Engineering 2023年第9期46卷 3209-3223页

作者： Mesfer al Duhayyim Fatma S.alrayes Saud S.alotaibi Sana alazwari nasser allheeib Ayman Yafoz Raed alsini Amira Sayed A.Aziz Department of Computer Science College of Sciences and Humanities-AflajPrince Sattam bin Abdulaziz UniversitySaudi Arabia Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Information Systems College of Computing and Information SystemUmm Al-Qura UniversitySaudi Arabia Department of Information Technology College of Computers and Information TechnologyTaif UniversityTaif P.O.Box 11099Taif21944Saudi Arabia Department of Information Systems-College of Computer and Information Sciences King Saud UniversityRiyadhSaudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddahSaudi Arabia Department of Digital Media Faculty of Computers and Information TechnologyFuture University in EgyptNew Cairo11835Egypt

The Internet of Things(IoT)offers a new era of connectivity,which goes beyond laptops and smart connected devices for connected vehicles,smart homes,smart cities,and connected *** massive quantity of data gathered from numerous IoT devices poses security and privacy concerns for *** the increasing use of multimedia in communications,the content security of remote-sensing images attracted much attention in academia and *** encryption is important for securing remote sensing images in the IoT ***,researchers have introduced plenty of algorithms for encrypting *** study introduces an Improved Sine Cosine algorithm with Chaotic Encryption based Remote Sensing Image Encryption(ISCACE-RSI)technique in IoT *** proposed model follows a three-stage process,namely pre-processing,encryption,and optimal key *** remote sensing images were preprocessed at the initial stage to enhance the image ***,the ISCACERSI technique exploits the double-layer remote sensing image encryption(DLRSIE)algorithm for encrypting the *** DLRSIE methodology incorporates the design of Chaotic Maps and deoxyribonucleic acid(DNA)Strand Displacement(DNASD)*** chaotic map is employed for generating pseudorandom sequences and implementing routine scrambling and diffusion processes on the plaintext ***,the study presents three DNASD-related encryption rules based on the variety of DNASD,and those rules are applied for encrypting the images at the DNA sequence *** an optimal key generation of the DLRSIE technique,the ISCA is applied with an objective function of the maximization of peak signal to noise ratio(PSNR).To examine the performance of the ISCACE-RSI model,a detailed set of simulations were *** comparative study reported the better performance of the ISCACE-RSI model over other existing approaches.

关键词： Remote sensing internet of things image encryption security optimal key generation

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A direct power control of a DFIG based-WECS during symmetrical voltage dips

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Protection and Control of Modern Power Systems 2020年第1期5卷 36-47页

作者： Sara Mensou Ahmed Essadki Tamou nasser Badr Bououlid Idrissi Research Center of Engineering and Health Sciences and Technologies from ENSET Mohammed V UniversityRabatMorocco Research Center of Engineering and Health Sciences and Technologies from ENSIAS Mohammed V UniversityRabatMorocco Electromechanical Engineering Department of ENSAM Moulay Ismaïl UniversityMeknèsMorocco.

The Wind Energy Conversion System(WECS)based Doubly Fed Induction Generator(DFIG)has experienced a rapid development in the world,which leads to an increasing insertion of this source of energy in the electrical *** sudden and temporary drop of voltage at the network can affect the operation of the DFIG;the voltage dips produce high peak currents on the stator and rotor circuits,without protection,the rotor side converter(RSC)will suffer also from over-current limit,consequently,the RSC may even be destroyed and the generator be *** this paper a new Direct Power Control(DPC)method was developed,in order to control the stator powers and help the operation of the aero-generator during the faults grid;by injecting the reactive power into the network to contribute to the return of voltage,and set the active power to the optimum value to suppress the high peak *** DPC method was designed using the nonlinear Backstepping(BS)controller associated with the Lyapunov function to ensure the stability and robustness of the system.A comparison study was undertaken to verify the robustness and effectiveness of the DPC-BS to that of the classical vector control(VC)using Proportional-Integral(PI)*** were simulated under the Simulink®software.

关键词： Wind energy Doubly-fed induction aero-generator Voltage dips DPC strategy Backstepping technique Lyapunov function

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Generation of sodium hypochlorite (NaOCl) from sodium chloride solution using C/PbO_2 and Pb/PbO_2 electrodes

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 561-566页

作者： nasser Abu Ghalwa Hassan Tamos Mohamed ElAskalni Abed Rhman El Agha Chemistry Department Al-Azhar University of GazaP.O.Box 1277Palestine

Two modified electrodes （Pb/PbO2 and C/PbO2） were prepared by electrodepositing a lead oxide layer on lead and carbon sub- strates. These modified electrodes were used as anodes for the generation of sodium hypochlorite （NaOC1） from sodium chloride solution. Different operating conditions and factors affecting the treatment process of NaOC1 generation, including current density, pH values, con- ductive electrolytes, and electrolysis time, were studied and optimized. By comparison the C/PbO2 electrode shows a higher efficiency than the Pb/PbO2 electrode for the generation of NaOC1.

关键词： sodium hypochlorite sodium chloride lead oxide electrodeposition electrodes

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