Gadelmavla, Diaa
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Fawzy, D
Gadelmavla, Dıaa
Fawzy, Diaa
Fawzy, Diaa E.
Fawzy, DE
Fawzy, D. E.
Gadelmavla, Dıaa
Fawzy, Diaa
Fawzy, Diaa E.
Fawzy, DE
Fawzy, D. E.
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Email Address
diaa.gadelmavla@ieu.edu.tr
Main Affiliation
05.01. Aerospace Engineering
Status
Current Staff
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
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2ZERO HUNGER
1
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3GOOD HEALTH AND WELL-BEING
4
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4QUALITY EDUCATION
1
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
1
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7AFFORDABLE AND CLEAN ENERGY
4
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8DECENT WORK AND ECONOMIC GROWTH
1
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
1
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
0
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13CLIMATE ACTION
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14LIFE BELOW WATER
1
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
1
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Documents
71
Citations
591
h-index
15
Documents
30
Citations
351
Scholarly Output
73
Articles
26
Views / Downloads
301/394
Supervised MSc Theses
4
Supervised PhD Theses
0
WoS Citation Count
206
Scopus Citation Count
383
Patents
0
Projects
0
WoS Citations per Publication
2.82
Scopus Citations per Publication
5.25
Open Access Source
20
Supervised Theses
4
| Journal | Count |
|---|---|
| Monthly Notıces of the Royal Astronomıcal Socıety | 8 |
| Proceedings - 2023 10th International Conference on Electrical and Electronics Engineering, ICEEE 2023 | 4 |
| Astrophysıcs And Space Scıence | 4 |
| 2024 11th International Conference on Electrical and Electronics Engineering, ICEEE 2024 -- 11th International Conference on Electrical and Electronics Engineering, ICEEE 2024 -- 22 April 2024 through 24 April 2024 -- Marmaris -- 205032 | 3 |
| 2020 7th International Conference on Electrical and Electronics Engineering, ICEEE 2020 | 3 |
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Article Citation - WoS: 3Citation - Scopus: 3Theoretical Basal Ca Ii and Mg Ii Fluxes for Late-Type Stars: Results From Acoustic Wave Spectra With Time-Dependent Ionization and Multilevel Radiation Treatments(Oxford Univ Press, 2015-06-09) Fawzy, Diaa E.Computations of chromospheric models and the resulting spectral line emission fluxes are presented for late-type stars exhibiting very low level of chromospheric activity, referred to as a basal flux stars or low activity stars. The computations are self-consistent, and consider the entire acoustic wave energy spectra generated in the stellar convection zones. We consider multilevel atomic models, take into account departures from local thermodynamic equilibrium and also consider the time-dependent ionization processes of hydrogen. We employ the new finding of the mixing-length parameter alpha = 1.8. The Ca II H+K and Mg II h+k line fluxes are computed assuming pseudo-partial redistribution. The results show the importance of time-dependent ionization in modelling the middle and high chromospheres. Models without considering time-dependent ionization overestimate the emitted Ca II fluxes by factors between 1.1 and 5.6 for F8V and M0V stars, respectively, while factors between 1.8 for G0V and 17.4 for M0V stars have been obtained for the MgII fluxes. The theoretically computed basal fluxes in Ca II and MgII, respectively, follow simple linear formulae depending on the effective temperature log T-eff. The obtained results for Ca II fluxes show reasonable agreement with observations.Master Thesis Formal Verification of Fault Detection and Service Restore System in Smart Grid Using Probabilistic Model Checker(İzmir Ekonomi Üniversitesi, 2018) Naseem, Syed Atıf; Gadelmavla, DıaaDağıtım Yönetim Sistemi (DMS), dağıtım şebekesinin arkasındaki iletim şebekesinden Denetleyici Kontrol ve Veri Toplama (SCADA) 'nın genişlemesi ile başlar. Arıza Tespiti, Yalıtım ve Servis Yenileme (FDIR) tekniği (DMS) bugün Akıllı Şebekede en çok kullanılan uygulamalardan birini oluşturmaktadır. FDIR, kapalı devre, paralel devre ve radyal konfigürasyonlar için daha yüksek düzeyde bir optimizasyon gerektirir. FDIR, trafo merkezinin besleyici bölümünde arıza tespit ettikten sonra sistemin performansını artırmak için ağırlıklı olarak istihdam edilmektedir. Daha sonra arızalı anahtarı besleyiciden açar ve gücü arızasız besleyici bölümlerine yönlendirerek hizmeti düzeltir. Böylece, dağıtım sisteminin restorasyon süresi birkaç saatten birkaç saniyeye azaltılır; dağıtım sisteminde yüksek güvenilirlik ve istikrar sağlayarak şebekeyi belirgin bir şekilde kurtarma. Dolayısıyla, FDIR işlemi gerçek zamanlı koşullara göre düzgün çalışması için bir takım garanti gerektirir. Bu bağlamda, bu tezin başlıca katkısı (i) Akıllı Şebeke dağıtım şebekesinde FDIR davranışının Markov modelini geliştirmek, (ii) PRISM model kontrol aletinde resmi olarak model doğrulamak için sistemin doğruluğunu (a ) doğruluğu, (b) verimlilik ve (c) güvenilirlik PRISM aracında mantıksal özellikler geliştirerek. (iii) Veri paketini (IEEE 802.11 DCF) ve G-3 güç hattı iletişimini gönderme / alma mekanizmalarının Markov modelleri geliştirilmiş ve genel sistem davranışını araştırmak için PRISM model denetleyicisinde FDIR ile bütünleştirilmiştir. Bir başka temel amaç da, (iv) dağıtım şebekesinde arıza oluşum sıklığını analiz etmek ve (v) dağıtım şebekesinin farklı komponentlerinin arıza olasılığını öngörmek için iletişim ağı ile birlikte FDIR'in olasılıksal Markov modelini oluşturmaktır. düzeltici bir işlem ve bakım yapın. Böylece, hatalı bileşen manuel olarak değiştirilebilir sistemin eksikliğinden kaçınmak için önceden. Ayrıca, (vi) hatanın oluşması durumunda arızalı bileşen kendisini sökerek dağıtım şebekesinin yük anahtarlarının düzgün çalışıp çıkamayacağını analiz eder ve tahmin ederiz. Son olarak, (vii) sistemi, belirli etkin olmayan anahtarla kurtarma olasılığının tahmini, kablosuz iletişim ağı ile FDIR modeli ve Ethernet veya fiber optik ortamı gibi ideal iletişim ağı ile FDIR modeli arasındaki karşılaştırma ile birlikte analiz edilmiştir. Simülasyon sonuçları, restorasyon süresi periyodunun artırılmasının, olasılığı 0.03 faktör ile arttırdığını göstermektedir. Ayrıca FDIR modelini 6 yük anahtarı, koruma rölesi, devre kesici ve Tianjin elektrik şirketi üzerindeki FDIR davranışını test ederek genişlettik. Ağın genişletilmesine yönelik Markov modeli PRISM aracı üzerinde yorumlandı ve PRISM model denetleyicisinin zamansal mantık spesifikasyonu aracılığıyla modeli doğruladı ve Akıllı Şebeke bileşeninin başarısızlık, yalıtım ve restorasyon olasılıklarını öngördü. Karşılaştırma sonuçları, ideal iletişim ağı ile kablosuz iletişim ortamına kıyasla daha az arıza olasılığına sahip olduğunu açıkça gösteren, kablosuz iletişim ağıyla bağlantılı FDIR ile karşılaştırıldığında FDIR ideal iletişim ortamıyla bağlantılı olduğunda elde edilir ve tartışılır.Conference Object Citation - WoS: 3Citation - Scopus: 5Interfacing Wideband Amplifiers Using Ridge Gap Waveguide for Mm-Wave Systems(Institute of Electrical and Electronics Engineers Inc., 2020-04) Shams S.I.; Ali M.M.M.; Sebak A.; Elsaadany M.; Gagnon G.; Fawzy D.E.; Allam A.M.M.A.; Fawzy, Diaa E.; Gagnon, Ghyslain; Allam, A.M.M.A.; Sebak, Abdelrazik; Elsaadany, Mahmoud; Shams, Shoukry I.; Ali, Mohamed Mamdouh M.The 6G race has already begun, and many countries and giant corporations started directing significant efforts and funds towards the development of the future technology. The 6G standard is expected to migrate to higher bands of frequencies to support wider bandwidth. Through this wide bandwidth, it will be feasible to serve the expected massive number of users and future applications, such as virtual reality and HD realtime transmission. One major problem in high frequency ranges, such as mm-wave bands, is the high signal attenuation, which can be compensated through more efficient amplifier systems. In this paper, we propose a wideband amplifier design fed through a Ridge Gap Waveguide line. The proposed design has many advantages inherited from the host guiding structure. The signal is carried by a Quasi-TEM signal, which minimizes the signal distortion. Also, the structure acts as a large heat sink, which minimizes the operating temperature. As a result, the expected added noise by the proposed amplifier shall be minimal. © 2020 IEEE.Conference Object Citation - Scopus: 1Re-Configurable Power Divider Based on Printed Ridge Gap Waveguide Technology(Institute of Electrical and Electronics Engineers Inc., 2023-05-08) Ali, M.M.M.; Shams, S.I.; Elsaadany, M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Abbas, M.A.; Abo, Sree, M.F.; El-Din, M.S.H.SalahFuture Millimeter Wave (mmWave) band communication systems are predicted to be involved in different and diverse fields. These systems will be smart with high speed that enable the emergence of fundamental and advanced services. In order to realize these systems we need the use of reconfigurable microwave components implemented based on modern guiding structures. Power dividers are considered one of the essential components for the feeding antenna system. In this paper, Re-configurable Printed Ridge Gap Waveguide (RPRGW) is deployed to implement a power divider. The simulated results show a wide bandwidth of 16 % at 38.5 GHz. These results demonstrate the merit of using this technology to implement various microwave components suitable for smart communication systems. © 2023 IEEE.Article Citation - WoS: 26Citation - Scopus: 28The Secret Lives of Cepheids: Delta Cep-The Prototype of a New Class of Pulsating X-Ray Variable Stars(Iop Publishing Ltd, 2017-03-20) Engle, Scott G.; Guinan, Edward F.; Harper, Graham M.; Cuntz, Manfred; Evans, Nancy Remage; Neilson, Hilding R.; Fawzy, Diaa E.From our Secret Lives of Cepheids program, the prototype Classical Cepheid, delta Cep, is found to be an X-ray source with periodic pulsation-modulated X-ray variations. This finding complements our earlier reported phasedependent FUV-UV emissions of the star that increase similar to 10-20 times with highest fluxes at similar to 0.90-0.95 phi, just prior to maximum brightness. Previously delta Cep. was found as potentially X-ray variable, using XMM-Newton observations. Additional phase-constrained data were secured with Chandra near X-ray emission peak, to determine if the emission and variability were pulsation-phase-specific to delta Cep. and not transient or due to a possible coronally active, cool companion. The Chandra data were combined with prior XMM-Newton observations, and were found to very closely match the previously observed X-ray behavior. From the combined data set, a similar to 4 increase in X-ray flux is measured, reaching a peak L-X = 1.7 x 10(29) erg s(-1) near 0.45 phi. The precise X-ray flux phasing with the star's pulsation indicates that the emissions arise from the Cepheid and not from a companion. However, it is puzzling that the maximum X-ray flux occurs similar to 0.5 phi (similar to 3 days) later than the FUV-UV maximum. There are several other potential Cepheid X-ray detections with properties similar to delta Cep, and comparable X-ray variability is indicated for two other Cepheids: beta Dor. and V473 Lyr. X-ray generating mechanisms in delta Cep. and other Cepheids are discussed. If additional Cepheids are confirmed to show phased X-ray variations, then delta Cep. will be the prototype of a new class of pulsation-induced X-ray variables.Conference Object Citation - Scopus: 6Machine Learning Based Design of Ku Band Ridge Gap Waveguide Slot Antenna Loaded With Fss for Satellite Internet Applications(Institute of Electrical and Electronics Engineers Inc., 2021-12-04) Nakmouche M.F.; Derbal M.C.; Allam A.M.M.A.; Fawzy D.E.; Shams S.I.; Nedil M.; Elsaadany M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Gagnon, Ghyslain; Derbal, Mohammed Cherif; Nedil, Mourad; Nakmouche, Mohammed Farouk; Shams, Shoukry I.Machine learning has been used in this work for the development of a Ku band Ridge Gap Waveguide (RGW) slot antenna loaded with an FSS superstrate for satellite internet applications. The structure operates from 13.25 to 14.75 GHz with a gain beyond 10 dB using FSS superstrate loading. The developed machine learning model aims to predict the optimal length and width of the radiated slot, where both the Fractional Bandwidth (FBW) and the resonance frequency are considered objective parameters. The simulated results and the anticipated results through the machine learning algorithm are in good agreement. © 2021 IEEE.Conference Object Development of a Split Ring Resonator Sensor for Vibration Detection(Institute of Electrical and Electronics Engineers Inc., 2024-04-22) Zengin, E.B.; Fawzy, D.E.; Allam, A.M.M.A.; Şahin, O.N.The main focus of this work is the development of a metamaterial-based vibration sensor for the detection of earthquake amplitudes. The sensor is composed of two metamaterial layers made of FR-4 substrates with Circular Split Ring Resonators (CSRR) arranged in a back-to-back configuration on each substrate. The variation of the spacing between the plates results in an alteration of the electric field and thus changes in the resonance frequencies of the whole system. The system is designed and optimized to resonate in the GSM 1.8 GHz band, which ultimately results in a self-sustaining sensor. A clear relationship between the spacing of the two layers and the shift in the resonance frequency has been obtained. It also changes the magnitude of the reflected and absorbed energy from the sensor. This spacing in turn can be directly correlated with the vibration amplitudes. The system can be integrated into a warning system with the ability to quantify the structural resilience of buildings against potentially damaging vibrations. Different unit cell geometries of metamaterial surface are tested before selecting the CSRR geometry to develop highly sensitive sensors operating in the GSM frequency band at 1.8 GHz. © 2024 IEEE.Conference Object Citation - WoS: 5Citation - Scopus: 19Dual Band Siw Patch Antenna Based on H-Slotted Dgs for Ku Band Application(Institute of Electrical and Electronics Engineers Inc., 2020-04) Nakmouche M.F.; Fawzy D.E.; Allam A.M.M.A.; Taher H.; Sree M.F.A.; Taher, Hany; Sree, Mohamed Fathy Abo; Nakmouche, Mohammed Farouk; Fawzy, Diaa E.; Allam, A.M.M.A.A dual band Substrate Integrated Waveguide; SIW microstrip patch antenna based on periodic H-Defected Ground Structure; H-DGS is designed for Ku band applications. SIW techniques provide low cost, small size and convenient integration with planer circuit. The proposed antenna structure is designed on a Roger 5058 substrate with a thickness of 1.6 mm, 2.2 of dielectric constant and tangent loss of 0.0009. The performance analysis of the proposed antennas is performed using finite element methods, and the simulation results show a gain and directivity of 7.03 dB and 7.38 dB respectively at 12.67 GHz center frequency and at 14.56 GHz a gain of 7.77 dB and directivity of 8.13 dB. The proposed antenna overall radiation efficiency is 95.25% and 95.60% at 12.67 GHz and 14.56 GHz, respectively. The obtained measurements show good agreement with the simulation results. The proposed antenna is compact, simple in structure, and can be used in a variety of applications in the Ku band. © 2020 IEEE.Conference Object Citation - Scopus: 15Metamaterial-Based Mm-Wave Phased Array for Broadband Cellular Networks(Institute of Electrical and Electronics Engineers Inc., 2023-07-18) Amar, A.S.I.; Parchin, N.O.; Fawzy, Diaa E.; Allam, A.M.M.A.; Eid, A.M.; Soliman, M.A.A new broadband phased array antenna with wide-scan and high-gain beam-scanning are desirable to meet the requirements of future cellular networks. This paper discusses the characteristics of a new beam-steerable array design having broad bandwidth for 5G communications. The discussion is focused on smartphones, due to their small size and complexity. The design procedure is straightforward and accomplished on a mainboard of future smart handheld devices. The introduced phased array design involves eight metamaterial-based dipole resonators with a 1×8 linear form. The resonators have small sizes with microstripline feedings. For -10 dB, the design represents 28-38 GHz covering several bands in the 5G spectra. © 2023 IEEE.Article Citation - WoS: 6Citation - Scopus: 7A Novel Circular Reconfigurable Metasurface-Based Compact Uwb Hybrid Coupler for Ku-Band Applications(IEEE-Inst Electrical Electronics Engineers Inc, 2022) Abbas, Mohamed Atef; Cengiz, Mehmet Faruk; Allam, A. M. M. A.; Fawzy, Diaa E.; Elhennawy, Hadia M. M.; Sree, Mohamed Fathy AboA novel circular reconfigurable metasurface (MS) based compact ultra-wideband (UWB) hybrid coupler is developed for Ku-band applications. The coupler is developed using the substrate-integrated gap waveguide (SIGW) technology. The coupler structure consists of two layers, the bottom layer represents the artificial magnetic surface of the periodic structures and the ridges in between that guide the wave in the required direction with minimum dispersion. It involves the coupling section with a centered etched slot and two additional vias to achieve the basic hybrid coupler properties. This layer is nominated as the ridge layer. The second layer is a circular shape of a dielectric gap loaded with the top ground. The top ground is left solid for a non-reconfigurable coupler. Concerning the reconfigurable coupler, this layer contains an artificial metasurface of Jerusalem cross elements where the copper is etched around. This layer is nominated as the gap layer. This MS surface is mechanically rotated to offset the magnitude and phase of the signal going to the through and coupled ports. The findings obtained from the simulations show that the reconfiguration can be accomplished by rotating the MS around the source coupler's central axis. The rotation is tested between 0 & DEG; to 180 & DEG; in the counter-clockwise direction. The operating frequency range of the coupler is between 11.94 to 16.91 GHz, which covers approximately the whole Ku-band. The coupler delivers continuously adjustable amplitude between 2.6 and 4.8 dB while the phase differences within 77 & DEG; to 105 & DEG; over a fractional bandwidth (FBW) of 34.45%. It is manufactured using PCB technology and measured using network analyzer. A strong agreement is achieved between simulations and measurements. The proposed coupler can be used in traditional beam-forming and beam-steering networks by changing the rotation angle or the operating frequency. The developed coupler can replace the Butler and Bless matrices with their complication, heavy number of phase shifters, and crossover problems. The current work can be extended to operate in the mm-Wave band by changing the dimension and the material of the unit cell of the ridge layer of the coupler.
