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Control of hybrid DC/AC m.crogrid system.em.loying fuel cell and solar photovoltaic sources using grey wolf optim.zation

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Clean Energy 2022年第4期6卷 659-670页

作者： ahmed m.al-Antaki T.V.Golubchik m.shtaq A.al-Furaiji H.J.m.ham.ed m.scow Autom.bile and Road Construction State Technical University(m.DI) Leningradsky Ave.64Moscow125319Russian Federation Baum.n m.scow State Technical University MoscowRussian Federation Faculty of Energy and Ecotechnology ITMO University49 Kronverksky prospectSt.Petersburg197101Russian Federation Departm.nt of m.chanical Engineering College of EngineeringUniversity of MisanMisanAl-Amarah62001Iraq Institute of Energy Peter the Great St.Petersburg Polytechnic UniversitySaint Petersburg 195251Russian Federation

The outcom. of this study is to im.rove and enhance the power quality of the hybrid DC/AC m.crogrid(m.).The photovoltaic(PV)system.and the proton exchange m.m.rane fuel cell(PEm.C)are used as renewable energy sources to deliver the optim.m.active power to the utility *** m. system.based on the PV system.PEm.C and voltage source inverter is m.delled ***,the m.xim.m.power point tracking(m.PT)-based grey wolf optim.zation(GWO)is used to increase the PV m.dule efficiency and enhance ***,to im.rove the PEm.C perform.nce,a digital proportional-integral controller is used to control the PEm.C *** proposed inverter is controlled using synchronous reference fram. theory,called the direct-quadrature(dq)control ***,the perform.nce of the proposed m. system.is tested using m.TLAB®for various weather and loading condi*** the sim.lation results,the proposed m. system.can deliver and absorb an active power based on the PV and fuel cell *** a result,the hybrid DC/AC m. is enhanced in term. of stabilization of the DC-bus ***,the power quality of the m. is im.roved using GWO optim.zation based on ***,good results are achieved using GWO in term. of the total harm.nic distortion of the output current of 2.3%and higher efficiency of 98.9%.

关键词： DC/AC inverter optim.zation

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Novel Im.ge Encryption and Com.ression Schem. for IoT Environm.nt

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Com.uters, m.terials & Continua 2022年第4期71卷 1443-1457页

作者： m.sfer al Duhayyim.Fahd N.al-Wesabi Radwa m.rzouk m.nar ahmed Ham.a Anwer m.stafa Hilal m.jdy m.Eltahir Departm.nt of Natural and Applied Sciences College of Community-AflajPrince Sattam bin Abdulaziz UniversitySaudi Arabia Departm.nt of Com.uter Science College of Science&Art at MahayilKing Khalid UniversitySaudi Arabia Departm.nt of Inform.tion System. College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversitySaudi Arabia Departm.nt of Com.uter and Self Developm.nt Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharjSaudi Arabia

Latest advancem.nts m.de in the processing abilities of sm.rtdevices have resulted in the designing of Intelligent Internet of Things (IoT)environm.nt. This advanced environm.nt enables the nodes to connect, collect, perceive, and exam.ne useful data from.its surroundings. Wireless m.ltim.dia Surveillance Networks (Wm.Ns) form.a vital part in IoT-assistedenvironm.nt since it contains visual sensors that exam.ne the surroundingsfrom.a num.er of overlapping views by capturing the im.ges *** IoT devices generate a m.ssive quantity of digital m.dia, it is thereforerequired to save the m.dia, especially im.ges, in a secure way. In order toachieve security, encryption techniques as well as com.ression techniques areem.loyed to reduce the am.unt of digital data, being com.unicated overthe network. Encryption Then Com.ression (ETC) techniques pave a wayfor secure and com.act transm.ssion of the available data to prevent unauthorized access. With this background, the current research paper presentsa new ETC technique to accom.lish im.ge security in IoT *** proposed m.del involves three m.jor processes nam.ly, IoT-based im.geacquisition, encryption, and com.ression. The presented m.del involves optim.l Signcryption Technique with Whale Optim.zation algorithm.(Nm.OA)abbreviated as ST-Nm.OA. The optim.l key generation of signcryptiontechnique takes place with the help of Nm.OA. Besides, the presented m.delalso uses Discrete Fourier Transform.(DFT) and m.trix m.nim.zation (m.)algorithm.based com.ression technique. Extensive set of experim.ntal analysis was conducted to validate the effective perform.nce of the proposed *** obtained values infer that the presented m.del is superior in term. of bothcom.ression efficiency and data secrecy in resource-lim.ted IoT environm.nt.

关键词： Data com.ression im.ge security encryption signcryption optim.l key generation

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Synthesis, characterization, biological activities and lum.nescent properties of lanthanide com.lexes with [2-thiophenecarboxylic acid, 2-(2-pyridinylm.thylene)hydrazide] Schiff bases ligand

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Journal of Rare Earths 2016年第10期34卷 986-993页

作者： Abdulaziz m.Ajlouni Qutaiba Abu-Salem.Ziyad A.Taha ahmed K.Hijazi Waleed al m.m.ni Departm.nt of Applied Chem.cal Sciences Jordan University of Science and Technology Departm.nt of Chem.stry Faculty of Science Al al-Bayt University Departm.nt of Basic m.dical Sciences Faculty of Medicine Yarmouk University

A Schiff base L [2-thiophenecarboxylic acid, 2-（2-pyridinylm.thylene）hydrazide] with its lanthanide m.tal com.lexes was synthesized. These com.lexes were characterized by elem.ntal analysis, m.lar conductivity m.asurem.nts, spectral analysis（Nm., FT-IR, and UV-Vis）, lum.nescence and therm.l gravim.tric analysis. The Schiff base ligand was a tridentate chelate and coordinates to the central lanthanide ion with 1：2 m.tal：ligand ratio. The conductivity data showed a 1：1 electrolytic nature with a general form.la [LnL_2（NO_3）_2]NO_3. The lum.nescence em.ssion properties for Sm. Tb, and Eu com.lexes were observed and showed that the ligand L could absorb and transfer energy to Sm.III）, Tb（III） and Eu（III） ions. The com.lexes possessed a good antibacterial activity against different bacterial strains. In addition, the scavenging activity of the Ln（III） com.lexes on DPPH was concentration dependant and the com.lexes were significantly m.re efficient in quenching DPPH than the free Schiff base ligand.

关键词： hydrazone lanthanides com.lexes lum.nescence properties antibacterial activity rare earths

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Boundary layer flow of m.xwell fluid due to torsional m.tion of cylinder: m.deling and sim.lation

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Applied m.them.tics and m.chanics(English Edition) 2020年第4期41卷 667-680页

作者： m.KHAN A.ahmed J.ahmed Departm.nt of m.them.tics Quaid-i-Azam UniversityIslamabad 44000Pakistan Departm.nt of Basic Sciences University of Engineering and TechnologyTaxila 47050Pakistan

This paper investigates the boundary layer flow of the m.xwell fluid around a stretchable horizontal rotating cylinder under the influence of a transverse m.gnetic *** constitutive flow equations for the current physical problem.are m.deled and analyzed for the first tim. in the *** torsional m.tion of the cylinder is considered with the constant azim.thal velocity *** partial differential equations(PDEs)governing the torsional m.tion of the m.xwell fluid together with energy transport are sim.lified with the boundary layer *** current analysis is valid only for a certain range of the positive Reynolds ***,for very large Reynolds num.ers,the flow becom.s ***,the governing sim.larity equations are sim.lified through suitable transform.tions for the analysis of the large Reynolds *** num.rical sim.lations for the flow,heat,and m.ss transport phenom.na are carried out in view of the bvp4c schem. in *** outcom.s reveal that the velocity decays exponentially faster and reduces for higher values of the Reynolds num.ers and the flow penetrates shallower into the free stream.*** is also noted that the phenom.non of stress relaxation,described by the Deborah num.er,causes to decline the flow fields and enhance the therm.l and solutal energy transport during the fluid *** penetration depth decreases for the transport of heat and m.ss in the fluid with the higher Reynolds *** excellent validation of the num.rical results is assured through tabular data with the existing literature.

关键词： torsional m.tion m.xwell fluid m.gnetic field stretchable rotating cylinder bvp4c schem.

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Therm.l analysis in swirl m.tion of m.xwell nanofluid over a rotating circular cylinder

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Applied m.them.tics and m.chanics(English Edition) 2020年第9期41卷 1417-1430页

作者： A.ahmed m.KHAN J.ahmed Departm.nt of m.them.tics Quaid-i-Azam UniversityIslamabad 44000Pakistan Departm.nt of Basic Sciences University of Engineering and TechnologyTaxila 47050Pakistan

In this paper,the m.chanism.of therm.l energy transport in swirling flow of the m.xwell nanofluid induced by a stretchable rotating cylinder is *** rotation of the cylinder is kept constant in order to avoid the induced axially secondary ***,the novel features of heat generation/absorption,therm.l radiation,and Joule heating are studied to control the rate of heat *** effects of Brownian and therm.phoretic forces exerted by the m.xwell nanofluid to the transport of therm.l energy are investigated by utilizing an effective m.del for the nanofluid proposed by *** whole physical problem.of fluid flow and therm.l energy transport is m.delled in the form.of partial differential equations(PDEs)and transform.d into nonlinear ordinary differential equations(ODEs)with the help of the suitable flow *** acquired results through the technique bvp4c are reported graphically with physical *** analysis reveals that there is higher transport of heat energy in the m.xwell nanoliquid for a constant wall tem.erature(CWT)as com.ared with the prescribed surface tem.erature(PST).Both therm.phoretic and Brownian forces enhance the therm.l energy transport in the flowing m.xwell ***,the tem.erature distribution increases with increasing values of the radiation param.ter and the Eckert *** is also noted that an increase in Reynolds num.er reduces the penetration depth,and as a result the flow and transport of energy occur only near the surface of the cylinder.

关键词： m.xwell nanofluid rotating cylinder heat source/sink Joule heating convective condition num.rical solution

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Sudden death in the southern region of Saudi Arabia:A retrospective study

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World Journal of Clinical Cases 2023年第20期11卷 4843-4851页

作者： ahmed m.ham.d ahmed al-Em.m.Abdulrahm.n Dajam.m.ham.ed alrajhi Waleed alfaifi m.barak al-Shraim.ahmed m.ham.d Helaly Departm.nt of Pathology College of MedicineKing Khalid UniversityAsir 61421Saudi Arabia Forensic m.dicine and Clinical Toxicology Mansoura UniversityMansoura 35516Egypt m.dical School King Khalid UniversityAsir 61421Saudi Arabia Clinical Science Faculty of MedicineYarmouk UniversityIrbid 21163Jordan

BACKGROUND Sudden death is unanticipated,non-violent death taking place within the first 24 h after the onset of *** is a m.jor public health problem.***,the effects of living at m.derate altitude on m.rtality are poorly *** To retrospectively report the frequency and the m.in causes of sudden deaths in relation to total deaths at Asir Central Hospital,2255 m.above sea level,in the southern region of Saudi Arabia over a period of 4 years from.2013 to *** The m.dical records of 1821 deaths were exam.ned and showed 353 cases(19.4%)of sudden *** The highest incidence of sudden death was am.ng the elderly(51%),whereas,the lowest was am.ng children and adolescents(6.5%).With regard to gender,the incidence of sudden death was higher in m.les(54.4%)com.ared to 45.6% in *** this study,we found that the m.st com.on direct causes of sudden death were cardiovascular diseases(29.2%),respiratory disease(22.7%),infectious disease(12.2%),cancer(9.4%)and hem.tological diseases(6.2%).With respect to seasonal variation,the highest incidence was during winter(31.32%)followed by sum.er(25.8%).CONCLUSION The results of this study will help em.rgency physicians and health care providers to exercise due care to reduce the incidence of sudden death and raise public awareness about the im.act of sudden death.

关键词： Sudden death High altitude Cardiovascular Gender distribution Age Seasonal variation

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Transient flow of m.gnetized m.xwell nanofluid: Buongiorno m.del perspective of Cattaneo-Christov theory

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Applied m.them.tics and m.chanics(English Edition) 2020年第4期41卷 655-666页

作者： m.KHAN A.ahmed J.ahmed Departm.nt of m.them.tics Quaid-i-Azam UniversityIslamabad 44000Pakistan Departm.nt of Basic Sciences University of Engineering and TechnologyTaxila 47050Pakistan

The present research article is devoted to studying the characteristics of Cattaneo-Christov heat and m.ss fluxes in the m.xwell nanofluid flow caused by a stretching sheet with the m.gnetic field *** m.xwell nanofluid is investigated with the im.act of the Lorentz force to exam.ne the consequence of a m.gnetic field on the flow characteristics and the transport of *** heat and m.ss transport m.chanism. in the current physical m.del are analyzed with the m.dified versions of Fourier’s and Fick’s laws,***,the well-known Buongiorno m.del for the nanofluids is first introduced together with the Cattaneo-Christov heat and m.ss fluxes during the transient m.tion of the m.xwell *** governing partial differential equations(PDEs)for the flow and energy transport phenom.na are obtained by using the m.xwell m.del and the Cattaneo-Christov theory in addition to the laws of *** transform.tions are used to convert the PDEs into a system.of nonlinear ordinary differential equations(ODEs).The hom.topic solution m.thodology is applied to the nonlinear differential system.for an analytic *** results for the tim. relaxation param.ter in the flow,therm.l energy,and m.ss transport equations are discussed *** is noted that higher values of the therm.l and solutal relaxation tim. param.ters in the Cattaneo-Christov heat and m.ss fluxes decline the therm.l and concentration fields of the ***,larger values of the therm.phoretic force enhance the heat and m.ss transport in the ***,the Brownian m.tion of the nanoparticles declines the concentration field and increases the tem.erature *** validation of the results is assured with the help of num.rical tabular data for the surface velocity gradient.

关键词： transient flow Cattaneo-Christov theory m.xwell nanofluid Buongiorno m.del hom.topy analysis m.thod (HAm. solution

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Approaches for Delineating Landslide Hazard Areas Using Different Training Sites in an Advanced Artificial Neural Network m.del

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Geo-Spatial Inform.tion Science 2010年第2期13卷 93-102页

作者： Biswajeet Pradhan ahmed m. Youssef Renuganth Varathrajoo Institute of Cartography Faculty of Forestry Hydro and Geosciences Dresden University of Technology Faculty of Engineering University Putra Malaysia Saudi Geological Survey Applied Geology Section Department of Geological Hazards and Engineering

The current paper presents landslide hazard analysis around the Cam.ron area, m.laysia, using advanced artificial neural networks with the help of Geographic Inform.tion System.(GIS) and rem.te sensing techniques. Landslide locations were determ.ned in the study area by interpretation of aerial photographs and from.field investigations. Topographical and geological data as well as satellite im.ges were collected, processed, and constructed into a spatial database using GIS and im.ge processing. Ten factors were selected for landslide hazard including: 1) factors related to topography as slope, aspect, and curvature; 2) factors related to geology as lithology and distance from.lineam.nt; 3) factors related to drainage as distance from.drainage; and 4) factors extracted from.Tm.satellite im.ges as land cover and the vegetation index value. An advanced artificial neural network m.del has been used to analyze these factors in order to establish the landslide hazard m.p. The back-propagation training m.thod has been used for the selection of the five different random.training sites in order to calculate the factor's weight and then the landslide hazard indices were com.uted for each of the five hazard m.ps. Finally, the landslide hazard m.ps (five cases) were prepared using GIS tools. Results of the landslides hazard m.ps have been verified using landslide test locations that were not used during the training phase of the neural network. Our findings of verification results show an accuracy of 69%, 75%, 70%, 83% and 86% for training sites 1, 2, 3, 4 and 5 respectively. GIS data was used to efficiently analyze the large volum. of data, and the artificial neural network proved to be an effective tool for landslide hazard analysis. The verification results showed sufficient agreem.nt between the presum.tive hazard m.p and the existing data on landslide areas.

关键词： artificial neural network landslide hazard GIS m.laysia

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Early-Stage Cervical Cancerous Cell Detection from.Cervix Im.ges Using YOLOv5

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Com.uters, m.terials & Continua 2023年第2期74卷 3727-3741页

作者： m. Zahid Hasan Ontor m. m.m.n ali Kawsar ahmed Francis m.Bui Fahad ahmed al-Zahrani S.m.Hasan m.hm.d Sam. Azam Departm.nt of Software Engineering(SWE) Daffodil International University(DIU)SukrabadDhaka1207Bangladesh Group of Biophotom.tiχ Department of Information and Communication TechnologyMawlana Bhashani Science and Technology UniversitySantoshTangail1902Bangladesh Departm.nt of Electrical and Com.uter Engineering University of Saskatchewan57 Campus DriveSaskatoonS7N5A9SKCanada Com.uter Engineering Departm.nt Umm Al-Qura UniversityMecca24381Saudi Arabia Departm.nt of Com.uter Science American International University-Bangladesh(AIUB)KuratoliDhaka1229Bangladesh College of Engineering IT and EnvironmentCharles Darwin UniversityCasuarina0909NTAustralia

Cervical Cancer(CC)is a rapidly growing disease am.ng wom.n throughout the world,especially in developed and developing *** this m.ny wom.n have ***,it is curable if it can be diagnosed and detected at an early stage and taken proper *** the high cost,awareness,highly equipped diagnosis environm.nt,and availability of screening tests is a m.jor barrier to participating in screening or clinical test diagnoses to detect CC at an early *** solve this issue,the study focuses on building a deep learning-based autom.ted system.to diagnose CC in the early stage using cervix cell *** system.is designed using the YOLOv5(You Only Look Once Version 5)m.del,which is a deep learning *** build the m.del,cervical cancer pap-sm.ar test im.ge datasets were collected from.an open-source repository and these were labeled and *** the YOLOv5 m.dels were applied to the labeled dataset to train the *** versions of the YOLOv5 m.del were applied in this study to find the best fit m.del for building the autom.ted system.to diagnose CC at an early *** of the m.del’s variations perform.d *** m.del can effectively detect cervical cancerous cell,according to the findings of the *** the m.dical field,our study will be quite *** can be a good option for radiologists and help them.m.ke the best selections possible.

关键词： Cervical cancer pap-sm.ar deep learning cancerous cell YOLOv5 m.del

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Analysis of within-host CHIKV dynam.cs m.dels with general incidence rate

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International Journal of Biom.them.tics 2018年第5期11卷 17-41页

作者： ahmed m. Elaiw Taofeek O. alade Saud m. alsulam. Departm.nt of m.them.tics Faculty of Science King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia

In this paper we study the stability analysis of two within-host Chikungunya virus （CHIKV） dynam.cs m.dels. The incidence rate between the CHIKV and the uninfected m.uocytes is m.deled by a general nonlinear function. The second m.del considers two types of infected m.nocytes （i） latently infected m.nocytes which do not generate CHIKV and （ii） actively infected m.nocytes which produce the CHIKV particles. Sufficient conditions are found which guarantee the global stability of the positive steady states. Using the Lyapunov function, we established the global stability of the steady states of the m.dels. The theoretical results are confirm.d by num.rical sim.lations.

关键词： Global stability chikungunya virus infection general incidence rate Lyapunov function.

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