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Dosim.tric Com.arison of Am.rphous Silicon EPID and 2D Array Detector for Pre-Treatm.nt Verification of Intensity m.dulated Radiation Therapy

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International Journal of m.dical Physics, Clinical Engineering and Radiation Oncology 2018年第4期7卷 438-452页

作者： Aym.n G. Ibrahim.Ism.il E. m.ham.d hamdy m. zidan Radiation Oncology & Nuclear m.dicine Departm.nt Mansoura University Hospitals Mansoura Egypt Departm.nt of Biophysics Faculty of Medicine Ain Shams University Cairo Egypt Departm.nt of Physics Faculty of Science Damietta University Egypt

Purpose: To study the dosim.tric characteristics of am.rphous silicon Electronic Portal Im.ging Device EPID and 2D array detector for dose verification of radiotherapy treatm.nt plans, and the quality assurance QA testing of Im.T was investigated. m.terials and m.thods: All m.asurem.nts were done with Varian IX linear accelerator, aSi-1000 EPID and 2D array detector. The dose linearity, reproducibility, output factors, dose rate, SDD and response with slap phantom.thickness have been m.asured and com.ared against those m.asured by ion cham.er. Results: The characteristics of EPID and 2D array: the response of EPID agreed with 2D array and ion cham.er 0.6cc. EPID and 2D array showed short-term.output reproducibility with SD = 0.1%. The dose rates of 2D array SD = ±0.7%, EPID = ±0.4% com.ared with a 0.6 cc SD = ±0.5%. Output factor m.asurem.nts for the central cham.er of the EPID and 2D array showed no considerable deviation from.ion cham.er m.asurem.nts. m.asurem.nt of beam.profiles with the EPID and 2D array m.tched very well with the ion cham.er m.asurem.nts in the water phantom. The EPID is m.re sensitive to lower energy photons by increasing solid water phantom.thickness. The m.an and standard deviation passing rates (γ%≤1) for film. 2D array and EPID for 30 Im.T fields of five patients were 95.93 ± 0.96%, 99.05 ± 0.24%, and 99.37 ± 0.12%, respectively. Conclusion: The study shows that EPID and 2D array are a reliable and accurate dosim.ter and a useful tool for quality assurance. We found that the EPID was m.re accurate com.ared with both 2D array and ion cham.er. The gam.a criterion of 3%/3 m. is the m.st suitable criteria for Im.T plans of QA.

关键词： Im.T EPID 2D Array Detector Gam.a Index Quality Assurance

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Co-doped Ni_(3)S_(2) nanosheet array: A high-efficiency electrocatalyst for alkaline seawater oxidation

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Nano Research 2024年第3期17卷 1050-1055页

作者： m.ng Yue Xun He Shengjun Sun Yuntong Sun m.ham.d S.hamdy m.am.d Benaissa Alsam.ni A.m.Salih Jun Liu Xuping Sun College of Chem.stry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute of Fundam.ntal and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Departm.nt of Chem.stry College of ScienceKing Khalid UniversityP.O.Box 9004Abha 61413Saudi Arabia Departm.nt of Chem.cal Engineering College of EngineeringUniversity of Ha’ilP.O.Box 2440Ha’il 81441Saudi Arabia Departm.nt of Otolaryngology-Head&Neck Surgery West China HospitalSichuan UniversityChengdu 610041China

Developing efficient and durable oxygen evolution reaction(OER)catalysts holds great prom.se for green hydrogen production via seawater electrolysis,but rem.ins a ***,we report a Co-doped Ni_(3)S_(2) nanosheet array on Ni foam.Co-Ni_(3)S_(2)/NF)as a high-efficiency OER electrocatalyst for *** alkaline conditions,Co-Ni_(3)S_(2)/NF requires an overpotential of only 368 m. to drive 100 m.·cm.(–2),superior to Ni_(3)S_(2)/NF(385 m.).Besides,it exhibits at least 50-h continuous electrolysis.

关键词： Co doping Ni_(3)S_(2)nanosheet array oxygen evolution reaction seawater electrolysis electrocatalyst

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Rao Algorithm.-Based Structure Optim.zation for Heterogeneous Wireless Sensor Networks

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Com.uters, m.terials & Continua 2024年第1期78卷 873-897页

作者： Shereen K.Refaay Sam.a A.Ali m.um.n T.El-m.legy Louai A.m.ghrabi hamdy H.El-Sayed Faculty of Com.uters and Artificial Intelligence Sohag UniversitySohag82524Egypt Faculty of Engineering Assiut UniversityAssiut711745Egypt College of Engineering University of Business and TechnologyJeddah23411Saudi Arabia

The structural optim.zation of wireless sensor networks is a critical issue because it im.acts energy consum.tion and hence the network’s *** studies have been conducted for hom.geneous networks,but few have been perform.d for heterogeneouswireless sensor *** paper utilizes Rao algorithm. to optim.ze the structure of heterogeneous wireless sensor networks according to node locations and their initial *** proposed algorithm. lack algorithm.specific param.ters and m.taphorical *** proposed algorithm. exam.ne the search space based on the relations of the population with the best,worst,and random.y assigned *** proposed algorithm. can be evaluated using any routing protocol,however,we have chosen the well-known routing protocols in the literature:Low Energy Adaptive Clustering Hierarchy(LEACH),Power-Efficient Gathering in Sensor Inform.tion System.(PEAGSIS),Partitioned-based Energy-efficient LEACH(PE-LEACH),and the Power-Efficient Gathering in Sensor Inform.tion System. Neural Network(PEAGSIS-NN)recent routing *** com.are our optim.zed m.thod with the Jaya,the Particle Swarm.Optim.zation-based Energy Efficient Clustering(PSO-EEC)protocol,and the hybrid Harm.ny Search Algorithm.and PSO(HSA-PSO)*** efficiencies of our proposed algorithm. are evaluated by conducting experim.nts in term. of the network lifetim.(first dead node,half dead nodes,and last dead node),energy consum.tion,packets to cluster head,and packets to the base *** experim.ntal results were com.ared with those obtained using the Jaya optim.zation *** proposed algorithm. exhibited the best *** proposed approach successfully prolongs the network lifetim. by 71% for the PEAGSIS protocol,51% for the LEACH protocol,10% for the PE-LEACH protocol,and 73% for the PEGSIS-NN protocol;m.reover,it enhances other criteria such as energy conservation,fitness convergence,packets to cluster head,and packets to the base sta

关键词： Wireless sensor networks Rao algorithm. optim.zation LEACH PEAGSIS

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Geochem.stry of island arc assem.lage in the Eastern Desert of Egypt and the role of Pan-African m.gm.tism.in crustal growth of the Arabian–Nubian Shield:A review

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Acta Geochim.ca 2024年第3期43卷 588-622页

作者： Abdel-Aal m.bdel-Karim.m.ham.d m.0} Adel A.Surour Geology Departm.nt Faculty of ScienceZagazig UniversityZagazig 44519Egypt Geology Departm.nt Faculty of ScienceTanta UniversityTanta 31527Egypt Departm.nt of Geological Sciences Faculty of ScienceNew Galala City 43511Egypt Geology Departm.nt Faculty of ScienceCairo UniversityGiza 12613Egypt

Neoproterozoic island arc assem.lage of the Arabian–Nubian Shield(ANS)in the Eastern Desert(ED)of Egypt com.rises juvenile suites of m.tavolcanics(m.),large am.unts of m.ta-sedim.ntary rocks(m.),and volum.nous m.tagabbros-diorites(m.D)and syn-tectonic intrusions of older granitoids(OG).We report here the updates of these four rock units in term. of classification,distribution,chem.cal characteristics,geodynam.c evolution,m.tam.rphism.and *** addition,we discuss these integrated data to elucidate a reasonable and reliable m.del for crustal evolution in the *** m.in features of these rock units indicate their relation to each other and the geodynam.c environm.nt dom.nated by early im.ature oceanic island arcs to prim.tive continental *** inform.tion of the island arc m.tavolcanic and plutonic rocks(gabbros,diorites,tonalites,and granodiorites)furnish evidence of the genetic *** include proxim.ty and a coeval nature in the field;all protolith m.gm.s are subalkaline in nature following calc-alkaline series with m.nor tholeiitic affinities;com.on geochem.cal signature of the arc rocks and subduction-related m.gm.tism.their sim.lar enrichm.nt in LREEs;and sim.lar m.jor elem.nt com.ositions with m.fic m.lts derived from.m.tasom.tized m.ntle *** volcano-sedim.ntary and the OG rocks underwent m.ltiphase deform.tion events whereas the m.D com.lexes deform.d *** on the m.gm.tic,sedim.ntological,and m.tam.rphic evolutions constrained by geochronological data as well as the progressive evolutionary trend from.extensional to com.ressional regim.s,a possible gradual decrease in the subducted slab dip angle is the m.st infl uential in any geodynam.c m.del for arc assem.lage in the ED of Egypt.

关键词： Island arc assem.lage m.gm.tism Crustal growth Neoproterozoic Arabian–Nubian Shield Eastern Desert Egypt

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Evaluation of hybrid closed-loop insulin delivery system.in type 1 diabetes in real-world clinical practice:One-year observational study

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World Journal of Diabetes 2024年第3期15卷 455-462页

作者： Ahm.d Eldib Shilton Dhaver Karim.Kibaa Astrid Atakov-Castillo Tareq Salah m.rwa Al-Badri Abdelrahm.n Khater Ryan m.Carragher Om.ia Elenani Elena Toschi Osam. hamdy Departm.nt of Clinical Behavioral&Outcomes ResearchJoslin Diabetes CenterBostonMA 02215United States Departm.nt of m.dicine Harvard Medical SchoolBostonMA 02115United States

BACKGROUND In 2016,the Food and Drug Adm.nistration approved the first hybrid closed-loop(HCL)insulin delivery system.for adults with type 1 diabetes(T1D).There is lim.ted inform.tion on the im.act of using HCL system. on patient-reported outcom.s(PROs)in patients with T1D in real-world clinical *** this independent study,we evaluated glycem.c param.ters and PROs over one year of continuous use of m.dtronic’s 670G HCL in real-world clinical *** To assess the effects of hybrid closed loop system.on glycem.c control and quality of life in adults with *** We evaluated 71 patients with T1D(m.an age:45.5±12.1 years;59%fem.les;body weight:83.8±18.7 kg,body m.ss index:28.7±5.6 kg/m.,A1C:7.6%±0.8%)who were treated with HCL at Joslin Clinic from.2017 to *** m.asured A1C and percent of glucose tim.-in-range(%TIR)at baseline and 12 *** m.asured percent tim. in auto m.de(%TiAm.for the last two weeks preceding the final visit and assessed PROs through several validated quality-of-life surveys related to general health and diabetes *** At 12 m.,A1C decreased by 0.3%±0.1%(P=0.001)and%TIR increased by 8.1%±2.5%(P=0.002).The average%TiAm.was only 64.3%±32.8%and was not associated with A1C,%TIR or ***,provided at baseline and at the end of the study,showed that the physical functioning subm.dule of 36Item.Short-Form.Health Survey increased significantly by 22.9%(Pm.a fear survey/worry scale decreased significantly by 24.9%(Pm.Areas In Diabetes reduced significantly by-17.2%(P=0.002).The em.tional burden subm.dules of dietary diversity score reduced significantly by-44.7%(P=0.001).Furtherm.re,analysis of Clarke questionnaire showed no increase in awareness of hypoglycem.c ***-5 showed no im.rovem.nts in subject’s wellbeing am.ng participants after starting the 670G HCL ***,analysis of Pittsburgh Sleep Quality Index showed no difference in sleep quality,sleep latency,or duration o

关键词： Artificial pancreas Continuous blood glucose m.nitor Type 1 diabetes Hybrid closed-loop insulin delivery Quality of life

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Partially Deep-Learning Encryption Technique

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Com.uters, m.terials & Continua 2023年第2期74卷 4277-4291页

作者： hamdy m.m.usa Faculty of Com.uters and Inform.tion Menoufia UniversityMenoufia32511Egypt

The biggest problem.facing the world is inform.tion security in the digital *** protection and integrity are hot topics at all tim.s,so m.ny techniques have been introduced to transm.t and store data *** increase in com.uting power is increasing the num.er of security breaches and attacks at a higher rate than before on ***,a num.er of existing security system. are at risk of *** paper proposes an encryption technique called Partial Deep-Learning Encryption Technique(PD-LET)to achieve data ***-LET includes several stages for encoding and decoding digital *** preprocessing,convolution layer of standard deep learning algorithm.zigzag transform.tion,im.ge partitioning,and encryption key are the m.in stages of ***,the proposed technique converts digital data into the corresponding m.trix and then applies encryption stages to *** im.lem.ntation of encrypting stages is frequently *** collaboration between deep learning and zigzag transform.tion techniques provides the best output result and transfers the original data into a com.letely undefined im.ge which m.kes the proposed technique efficient and secure via data ***,its im.lem.ntation phases are continuously changed during the encryption phase,which m.kes the data encryption technique m.re im.une to som. future attacks because breaking this technique needs to know all the inform.tion about the encryption *** security analysis of the obtained results shows that it is com.utationally im.ractical to break the proposed technique due to the large size and diversity of keys and PD-LET has achieved a reliable security system.

关键词： Encryption technique deep learning security zigzag transform.tion im.ge partitioning

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Hilfer fractional neutral stochastic partial differential equations with delay driven by Rosenblatt process

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Journal of Control and Decision 2022年第2期9卷 226-243页

作者： hamdy m.Ahm.d Higher Institute of Engineering El-Shorouk AcademyEI-Shorouk CityCairoEgypt

This m.nuscript is m.inly focusing on the approxim.te controllability and the null controllability for fractional neutral stochastic partial differential equations with delay driven by Rosenblatt *** discuss the sufficient conditions for approxim.te controllability and null controllability for Hilfer fractional neutral stochastic partial differential equations driven by Rosenblatt ***,we provide two exam.les to verify the obtained results.

关键词： Hilfer fractional neutral stochastic integro-differential system. approxim.te controllability null controllability Rosenblatt process

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Task Scheduling Optim.zation in Cloud Com.uting by Rao Algorithm

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Com.uters, m.terials & Continua 2022年第9期72卷 4339-4356页

作者： A.Younes m.KhElnahary m.nagi H.Alkinani hamdy H.El-Sayed Faculty of Com.uters and Inform.tion Department of Computer ScienceSohag UniversitySohag82524Egypt Departm.nt of Com.uter Science and Artificial Intelligence College of Computer Science and EngineeringUniversity of JeddahJeddah21959Saudi Arabia

Cloud com.uting is currently dom.nated within the space of highperform.nce distributed com.uting and it provides resource polling and ondem.nd services through the ***,task scheduling problem.becom.s a very im.ortant analysis space within the field of a cloud com.uting environm.nt as a result of user’s services dem.nd m.dification *** m.in purpose of task scheduling is to assign tasks to available processors to produce m.nim.m.schedule length without violating precedence *** heterogeneous m.ltiprocessor system.,task assignm.nts and schedules have a significant im.act on system.*** the heuristic-based task scheduling algorithm.the different processes will lead to a different task execution tim.(m.kespan)on a heterogeneous com.uting ***,a good scheduling algorithm.should be able to set precedence efficiently for every subtask depending on the resources required to reduce(m.kespan).In this paper,we propose a new efficient task scheduling algorithm.in cloud com.uting system. based on RAO algorithm.to solve an im.ortant task and schedule a heterogeneous m.ltiple processing *** basic idea of this process is to exploit the advantages of heuristic-based algorithm. to reduce space search and tim. to get the best *** evaluate our algorithm.s perform.nce by applying it to three exam.les with a different num.er of tasks and *** experim.ntal results show that the proposed approach significantly succeeded in finding the optim.l solutions than others in term. of the tim. of task im.lem.ntation.

关键词： Heterogeneous processors RAO algorithm heuristic algorithm. task scheduling m.ltiprocessing cloud com.uting

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Optim.zation Task Scheduling Using Cooperation Search Algorithm.for Heterogeneous Cloud Com.uting System.

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Com.uters, m.terials & Continua 2023年第1期74卷 2133-2148页

作者： Ahm.d Y.Ham.d m.Kh.Elnahary Faisal S.Alsubaei hamdy H.El-Sayed Departm.nt of Com.uter Science Faculty of Computers and Artificial IntelligenceSohag UniversitySohag82524Egypt Departm.nt of Cybersecurity College of Computer Science and EngineeringUniversity of JeddahJeddah21959Saudi Arabia

Cloud com.uting has taken over the high-perform.nce distributed com.uting area,and it currently provides on-dem.nd services and resource polling over the *** a result of constantly changing user service dem.nd,the task scheduling problem.has em.rged as a critical analytical topic in cloud *** prim.ry goal of scheduling tasks is to distribute tasks to available processors to construct the shortest possible schedule without breaching precedence *** and schedules of tasks substantially influence system.operation in a heterogeneous m.ltiprocessor *** diverse processes inside the heuristic-based task scheduling m.thod will result in varying m.kespan in the heterogeneous com.uting *** a result,an intelligent scheduling algorithm.should efficiently determ.ne the priority of every subtask based on the resources necessary to lower the *** research introduced a novel efficient scheduling task m.thod in cloud com.uting system. based on the cooperation search algorithm.to tackle an essential task and schedule a heterogeneous cloud com.uting *** basic idea of thism.thod is to use the advantages of m.ta-heuristic algorithm. to get the optim.l *** assess our algorithm.s perform.nce by running it through three scenarios with varying num.ers of *** findings dem.nstrate that the suggested technique beats existingm.thods NewGenetic Algorithm.NGA),Genetic Algorithm.GA),Whale Optim.zation Algorithm.WOA),Gravitational Search Algorithm.GSA),and Hybrid Heuristic and Genetic(HHG)by 7.9%,2.1%,8.8%,7.7%,3.4%respectively according to m.kespan.

关键词： Heterogeneous processors cooperation search algorithm task scheduling cloud com.uting

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DEPENDENCE OF m.DULUS OF ELASTICITY AND THERm.L CONDUCTIVITY ON REFERENCE TEm.ERATURE IN GENERALIZED THERm.ELASTICITY FOR AN INFINITE m.TERIAL WITH A SPHERICAL CAVITY

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Applied m.them.tics and m.chanics(English Edition) 2005年第4期26卷 470-475页

作者： hamdy m.Youssef m.them.tical Departm.nt Faculty of Engineering Umm Al_Qura UniversityMakkah Al_Mokaramah P.5555 Saudi Arabia

The equations of generalized therm.elasticity with one relaxation tim. with variable m.dulus of elasticity and the therm.l conductivity were used to solve a problem.of an infinite m.terial with a spherical *** inner surface of the cavity was taken to be traction free and acted upon by a therm.l shock to the surface. Laplace transform. techniques were used to obtain the solution by a direct *** inverse Laplace transform. was obtained *** tem.erature,displacem.nt and stress distributions are represented graphically.

关键词： therm.elasticity generalized therm.elasticity m.dulus of elasticity therm.l conductivity

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