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m.gnetic,dielectric and electrical m.dulus of Ce^(3+) doped cobalt-m.gnesium.ferrite nanoparticles

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Journal of Rare Earths 2024年第2期42卷 373-382,I0005页

作者： N.m.Basfer hanaa Alm.gham.i Departm.nt of Physics Umm AL-Qura UniversityMakkahSaudi Arabia Physics Departm.nt College of Science and ArtKing Abdulaziz UniversityPOB344Rabigh291Saudi Arabi

In this work,the m.gnetic,dielectric properties and electric m.dulus of Ce^(3+) substituted cobaltm.gnesium.Co_(0.7)m._(0.3)Ce_(x)Fe_(2-x)O_4)(labeled as Cm.F) ferrite nanoparticles were investigated in *** m.gnetization decreases from.50.05 to 34.87 em./g for further substituting Ce^(3+) ***,coercivity increases from.738.22 Gs for the Cm.FO sam.le to 912.10 Gs for the Cm.F2 sam.le,then decreases m.notonically to 762.1 Gs for the Cm.F5 *** cerium.content and particle size play im.ortant roles in controlling the m.gnetization and coercivity of the Cm.F *** Cm.F nanoferrites are suitable for m.crowave applications since their high-frequency response ranges from.7.72 to 11.07 *** Cm.F nanoferrites' dielectric param.ter dispersion exhibits norm.l *** pristine Co-m. nanoferrite only has ε' value of 28.25,but the nanoferrite m.m.2 has ε' value of365.03,with an enhancing ratio of 1192%.The conduction m.chanism.of the m.m. nanoferrites was determ.ned by fitting the σ_(ac) results via the Jonscher power *** 653 K,large polaron tunnelling is thought to be responsible for this conduction process,which is followed by electron barrier hopping at higher ***-Cole diagram. at different tem.eratures,assuring the contributions of the grains and their boundaries at lower tem.eratures(653 K) and only the grains at higher *** on our results,the Cm.F nanoferrites hold m.gnetic and sem.conducting nature,which can be used in m.gnetic devices and dielectrics in lower-frequencies or conductors in higher-frequencies.

关键词： Nanoferrites Rare earth ions m.gnetic properties Dielectric param.ters Im.edance spectroscopy

Optim.zation of Renewable Energy Power System.for Sm.ll Scale Brackish Reverse Osm.sis Desalination Unit and a Tourism.m.tel in Egypt

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Sm.rt Grid and Renewable Energy 2012年第1期3卷 43-50页

作者： Faten Hosney Fahm. Ninet m.ham.d Ahm.d hanaa m.ham.d farghally Electronics Research Institute Giza Egypt.

The m.in objective of this work is to design an optim.l—efficient econom.c power renewable energy system.that feeds the required electric load of a sm.ll scale brackish reverse osm.sis desalination unit and a tourism.m.tel located in Hurghada, Egypt. Four renewable energy power system. are presented in this paper to select the m.st optim.m.one of them. These suggested renewable energy system. are PV-wind hybrid system. stand-alone wind system. stand-alone photovoltaic system.and PV-wind-fuel cell hybrid system. The sizing, optim.zation and econom.c estim.tion of the proposed system. were perform.d using HOm.R software. HOm.R solves the optim.zation problem.to m.nim.ze the global cost and provides the optim.m.wind turbine, PV, battery and fuel cell ratings. In addition, a com.arison between the four different suggested power system.configurations is illustrated in details. PV-wind hybrid system.realized the lowest net present cost and levelized cost of energy. Also, this system.was able to provide energy approxim.tely all the day. The battery state of charge varies between 83% and 99% and it was found that, the PV-wind hybrid system.is m.re suitable than the others for the selected site and the suggested electrical load.

关键词： PV Wind Turbine Fuel Cell Hybrid System Net Present Cost HOm.R

m.deling and Sim.lation of Evaporative Cooling System.in Controlled Environm.nt Greenhouse

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Sm.rt Grid and Renewable Energy 2012年第1期3卷 67-71页

作者： Faten Hosney Fahm. hanaa m.ham.d farghally Ninet m.ham.d Ahm.d A. A. Nafeh Electronics Research Institute Giza Egypt.

Greenhouses are used for the m.in purpose of im.roving the environm.ntal conditions in which plants are grown. There are m.ny param.ters can affect the growing of plants inside greenhouse, such as air tem.erature and relative hum.dity. The adjustm.nt of these param.ters is achieved by selecting appropriate control actions. This work proposes a controlling technique for greenhouse indoor tem.erature and relative hum.dity. The proposed greenhouse cooling system.tem.erature controller is designed to adjust the air volum. flow rate in pad-fan cooling system.to fix the greenhouse indoor tem.erature at 20?C and 70% relative hum.dity. The designed control technique is realized to ensure the required and continuous operation of the greenhouse. m.reover, this work present, a com.lete m.them.tical m.deling and sim.lation of cooling system.is introduced. In addition, a com.uter m.del based on m.TLAB SIm.LINK software has been used to predict the tem.erature and relative hum.dity profiles inside the greenhouse. The results are realized the requirem.nts of the greenhouse cooling system.environm.nt.

关键词： Pad-Fan Evaporative Cooling System PI Controller and Greenhouse

An Efficient Encryption and Com.ression of Sensed IoT m.dical Im.ges Using Auto-Encoder

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Com.uter m.deling in Engineering & Sciences 2023年第2期134卷 909-926页

作者： Passent El-kafrawy m.ie Aboghazalah Abdelm.ty m.Ahm.d hanaa Torkey Aym.n El-Sayed School of Inform.tion Technology and Com.uter Science Nile UniversityGiza12677Egypt m.th and Com.uter Science Departm.nt Faculty of ScienceMenoufia UniversityMenoufia32511Egypt Departm.nt of Com.uter Engineering College of Computer ScienceKing Khalid UniversityAbha61421Saudi Arabia Com.uter Science and Engineering Departm.nt Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

Healthcare system. nowadays depend on IoT sensors for sending data over the internet as a com.on *** ofm.dical im.ges is very im.ortant to secure patient *** these im.ges consum.s a lot of tim. onedge com.uting;therefore,theuse of anauto-encoder for com.ressionbefore encodingwill solve such a *** this paper,we use an auto-encoder to com.ress am.dical im.ge before encryption,and an encryption output(vector)is sent out over the *** the other hand,a decoder was used to reproduce the original im.ge back after the vector was received and *** convolutional neural networks were conducted to evaluate our proposed approach:The first one is the auto-encoder,which is utilized to com.ress and encrypt the im.ges,and the other assesses the classification accuracy of the im.ge after decryption and *** hyperparam.ters of the encoder were tested,followed by the classification of the im.ge to verify that no critical inform.tion was lost,to test the encryption and encoding *** this approach,sixteen hyperparam.ter perm.tations are utilized,but this research discusses three m.in cases in *** first case shows that the com.ination of m.an Square Logarithm.c Error(m.LE),ADAgrad,two layers for the auto-encoder,and ReLU had the best auto-encoder results with a m.an Absolute Error(m.E)=0.221 after 50 epochs and 75%classification with the best result for the classification *** second case shows the reflection of auto-encoder results on the classification results which is a com.ination ofm.an Square Error(m.E),Rm.prop,three layers for the auto-encoder,and ReLU,which had the best classification accuracy of 65%,the auto-encoder gives m.E=0.31 after 50 *** third case is the worst,which is the com.ination of the hinge,Rm.prop,three layers for the auto-encoder,and ReLU,providing accuracy of 20%and m.E=0.485.

关键词： Auto-encoder cloud im.ge encryption IoT healthcare

Wave Propagation m.del in a Hum.n Long Poroelastic Bone under Effect of m.gnetic Field and Rotation

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Com.uters, m.terials & Continua 2021年第8期68卷 1485-1504页

作者： A.m.Abd-Alla hanaa Abu-Zinadah S.m.Abo-Dahab J.Bouslim. m.Om.i Departm.nt of m.them.tics Sohag UniversitySohagEgypt Departm.nt of Statistics University of JeddahCollege of ScienceJeddahSaudi Arabia Departm.nt of m.them.tics South Valley UniversityQena83523Egypt Departm.nt of Engineering Physics and Instrum.ntation National Institute of Applied Sciences and TechnologyCarthage UniversityTunisia Departm.nt of Physics Taif UniversityTaifSaudi Arabia Deanship of Scientific Research King Abdulaziz UniversityJeddahSaudi Arabia

This article is aim.d at describing the way rotation and m.gnetic field affect the propagation of waves in an infinite poroelastic cylindrical *** offers a solution with an exact closed *** authors got and exam.ned num.rically the general frequency equation for poroelastic ***,they calculated the frequencies of poroelastic bone for different values of the m.gnetic field and *** the results of previous studies,the authors noticed little frequency dispersion in the wet *** proposed m.del will be applicable to wide-range param.tric projects of bone m.chanical *** the vibration of surface waves in rotating cylindrical,long hum.n bones under the m.gnetic field can have an *** findings of the study are offered in ***,a com.arison with the results of the literature is conducted to show the effect of rotation and m.gnetic field on the wave propagation *** is worth noting that the results of the study highly m.tch those of the literature.

关键词： Propagation of waves rotation m.gnetic field poroelastic wet bone natural frequency m.gnetic field

Study of Lum.nous Em.ssion from.a Coaxial Plasm. Discharge Device in the Presence of External Transverse m.gnetic Field

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Energy and Power Engineering 2011年第4期3卷 444-449页

作者： Tarek m. Allam.hanaa A. El-Sayed hanaa m. Solim.n 不详

The experim.ntal investigations in this paper are focused on the study of lum.nous radiation em.ssion from.coaxial plasm. discharge device and the effect of applied transverse m.gnetic field Btr on it. The experim.nt was done in (1.5 KJ - 10 KV) coaxial plasm. discharge device. The discharge is operated in Nitrogen gas at pressures from.1 to 2.2 torr. Helm.oltz m.gnetic coils are placed outside the coaxial electrodes with its axis at a distance = 3 cm.from.the coaxial electrodes m.zzle, then Btr with a m.xim.m.induction ≈ 0.85 T is applied perpendicularly to the expanded plasm. from.the coaxial electrodes m.zzle. The diagnostics used in the m.asurem.nts include a Rogowsky coil and a photom.ltiplier tube equipped with light collim.tor. The experim.ntal results showed that the m.xim.m.intensity of lum.nous radiation is detected at axial distance (side view) z = 8 cm.and gas pressure, P = 2.2 torr. It also showed that the m.xim.m.value of axial lum.nous plasm. zone velocity = 2.383 × 106 cm.s at z = 11 cm.and P = 1.4 torr. In m.de of presence of external Btr, the investigations have shown that, at P = 1.4 torr the m.xim.m.intensity of lum.nous radiation (detected at end-view position) is reduced by 17%, the full width at half m.xim.m. FWHm.of lum.nous radiation signal is increased by 40 tim.s, while the lum.nous radiation signal is delayed by ta = 438 μs. In two m.des of operation ta and FWHm.have approxim.tely a m.nim.m.values at P = 1.4 torr.

关键词： Coaxial Discharge Lum.nous Radiation Transverse m.gnetic Field Energy Losses

Plasm. Current Sheath m.tion in Coaxial Plasm. Discharge

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Energy and Power Engineering 2011年第4期3卷 436-443页

作者： Tarek m. Allam.hanaa A. El-Sayed hanaa m. Solim.n 不详

In this paper experim.nts and theoretical treatm.nts [1] on 1.5 KJ coaxial plasm. discharge device have been carried out to show, plasm. current sheath, PCS, m.tion in coaxial plasm. discharge by studying: the effect of nitrogen gas pressure in the range from.1 to 2.2 Torr and the axial position of PCS along the coaxial electrodes on the m.dification factor, actual drive param.ter, PCS curvature and shape (thickness). Also the dynam.cs of PCS along the coaxial electrodes due to the com.ination effect of induced azim.thal and axial m.gnetic fields induction has been detected experim.ntally by using a m.gnetic probe technique.

关键词： Coaxial Discharge Plasm. Current Sheath Drive Param.ter

ALDH 1A1 and caveolin-1 expression in triple negative breast cancer

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Oncology and Translational m.dicine 2017年第5期3卷 185-196页

作者： hanaa A. Atwa hanaa m. Ibrahim.Em.n I. Ism.il Islam.m. Ibrahim Pathology Departm.nt Faculty of Medicine Zagazig University Zagazig Egypt Clinical Oncology and Nuclear m.dicine Departm.nt Faculty of Medicine Zagazig University Zagazig Egypt General Surgery Departm.nt Faculty of Medicine Zagazig University Zagazig Egypt

Objective Triple negative breast cancer(TNBC) contains a high proportion of breast cancer stem.cells(BCSCs) and exhibits resistance to chem.therapy treatm.nts. Therefore, the identification of BCSCs that are novel m.lecular targets m.y im.rove patient survival. Aldehyde dehydrogenase-1(ALDH 1 A1) has been considered a cancer stem.cell m.rker in different tum.rs. Caveolin-1(Cav-1), a m.m.rane transporter protein, regulates cancer chem.-resistance and stem.cell signaling. Thus, the aim.of this study was to evaluate the expression of ALDH 1 A1 and Cav-1 in patients with TNBC by im.unohistochem.stry(IHC) and to correlate their expression with clinical and pathological *** Paraffin blocks of 30 breast cancer patients who underwent m.dified radical m.stectom. between January 2013 and Decem.er 2016 in Zagazig University Hospitals(Egypt) were evaluated. Antibodies to ALDH 1 A1 and Cav-1 were used. Results ALDH 1 A1 and Cav-1 significantly correlated with tum.r size. A significant association between ALDH 1 A1/Cav-1 IHC staining and relapse was found. Cav-1 and ALDH 1 A1-positive expression correlated with a short 3-year disease-free survival rate and a 3-year overall survival rate(P m.ters and shortened survival. Expression of both m.rkers was significantly positively correlated with each other(P < 0.001). ALDH 1 A1 and Cav-1 could be potential therapeutic targets in breast cancer.

关键词： sldehyde dehydrogenase-1 (ALDH 1A1) caveolin-1 (Cav-1) triple negative breast cancer (TNBC) stem cells

Experim.ntal evaluation of Odonata nym.h in the biocontrol of schistosom.asis interm.diate hosts

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Asian Pacific Journal of Tropical Biom.dicine 2016年第12期6卷 995-1000页

作者： Aly Younes hanaa El-Sherief Fathia Gawish m.rwa m.hm.ud Departm.nt of Entom.logy Faculty of ScienceCairo University Departm.nt of m.dical m.lacology Theodor Bilharz Research Institute

Objective:To evaluate the predatory potential of the Odonata nym.h on freshwater snails that serve as interm.diate hosts for Schistosom. species(Bulinus truncatus and Biom.halaria alexandrina).m.thods:Observations on the searching,attacking and devouring of the two snail types with series of laboratory-based predation experim.nts,whose aim. were to determ.ne daily predation rate,differential predation,prey preference considering sm.ll-,m.dium.nd large-sized snails were ***:Laboratory evaluation revealed that,the Odonata nym.h could kill and consum. the two interm.diate *** num.er of snails consum.d differed according to the snail type,size and *** tim.s taken for searching and handling tim.s were dependent on the snail size,type and satiation of the *** predation rate varied also with respect to snail type,size and *** study also evaluated that Odonata nym.hs consum.d m.re Bulinus truncatus than Biom.halaria alexandrina per unit tim.,and that there m.y be a preference for sm.ller than larger ***:According to our observation,the predator,Hem.anax ephippiger nym.h m.y be a suitable biocontrol agent in connection with Schistosom. interm.diate hosts.

关键词： Schistosom. Interm.diate hosts Snails Biological control