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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diaa.gadelmavla@ieu.edu.tr
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05.01. Aerospace Engineering
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Sustainable Development Goals
8
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0
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9
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4
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10
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17
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12
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7
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4
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1
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5
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13
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4
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14
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2
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15
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16
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6
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3
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2
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11
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1
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Documents
71
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591
h-index
15
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30
Citations
351
Scholarly Output
68
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24
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92/1823
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4
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WoS Citation Count
201
Scopus Citation Count
362
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8
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11
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0
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WoS Citations per Publication
2.96
Scopus Citations per Publication
5.32
Open Access Source
18
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 |
| 2022 9Th Internatıonal Conference on Electrıcal And Electronıcs Engıneerıng (Iceee 2022) | 3 |
| 2023 International Telecommunications Conference, ITC-Egypt 2023 | 3 |
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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 - Scopus: 1Re-Configurable Power Divider Based on Printed Ridge Gap Waveguide Technology(Institute of Electrical and Electronics Engineers Inc., 2023) Ali, M.M.M.; Shams, S.I.; Elsaadany, M.; Fawzy, Diaa E.; Allam, A.M.M.A.; Abbas, M.A.; Abo, Sree, M.F.Future 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) 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.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) 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 Development of Millimeter Wave System Components for 5g/6g Wireless Networks(İzmir Ekonomi Üniversitesi, 2022) Cengiz, Mehmet Faruk; Gadelmavla, DıaaBu tez, boşluk dalga kılavuzu teknolojisine dayalı 5G ve mm dalga uygulamaları için üç sistem bileşeninin tasarımına ayrılmıştır. Üç bantlı bant geçiren filtre, sırasıyla 32,32 GHz, 35,75 GHz ve 38,12 GHz rezonans frekanslarına ve yaklaşık 0,6 dB, 1,1 dB ve 0,9 dB düşük ekleme kayıplarına sahip Ka-bant uygulamaları için tasarlanmıştır. V/W frekans bantlarındaki uygulamalar için dört portlu MIMO anten geliştirilmiştir. 72,7 ile 79,5 GHz aralığı arasındaki otomotiv radar ve uydular arası uygulamalarda kullanıma uygundur. D-bant uygulamaları için 140,9 ile 157,7 GHz aralığında yeni 4 x 1 dikdörtgen yarık anten dizisi geliştirilmiştir. Genel verimlilik %95 civarındadır ve maksimum kazanç yaklaşık 10 dBi'dir. DGS izolasyon geliştirme tabanlı dört portlu MIMO anteni, D-bandı uygulamaları için tasarlanmıştır. Empedans bant genişliği 148 GHz'den 161,7 GHz'e kadar uzanır. Farklı DGS geometrilerinin kullanılması kuplaj azaltmalarında etkili olup bu geometrilerinden elde edilen en yüksek kuplaj seviyesi -26,4 dB'dir, en düşük seviye yaklaşık -96 dB'ye ulaşır ve maksimum gerçekleşen kazanç 7,97 dBi'dir. 11,94 ile 16,91 GHz aralığındaki Ku-bant uygulamaları için özgün, ayarlanabilir metayüzey tabanlı kompakt UWB hibrit kuplör geliştirildi. Kuplör, 2,6 ile 4,8 dB arasında sürekli olarak ayarlanabilen büyüklük sunarken, faz farkları 77° ila 105° aralığındadır ve %34,45'lik kesirli bant genişliğine (FBW) sahiptir. Önerdiğimiz tasarım, Ku bandı/mm-bant aralığındaki ilk ayarlanabilir faz kuplörüdür.Conference Object Citation - Scopus: 1Low-Cost Aip Array Design Using Machine Learning for Mmwave Mobile Systems(Institute of Electrical and Electronics Engineers Inc., 2021) Nakmouche M.F.; Idrees Magray M.; Allam A.M.M.A.; Fawzy D.E.; Lin D.B.; Tarng J.-H.Based on low-cost PCB solution, an array antenna in packaging (AiP) dedicated for mmWave mobile systems is designed using machine learning. The proposed antenna operates at 28 GHz (26.5 - 29.5 GHz) with a gain ranging from 8 dB to 15 dB in the operating bandwidth. The development process of the proposed AiP is assisted by machine learning for prediction of the optimal radiating patch's length and width in terms of resonance frequency. © 2021 Taiwan Microwave Association.Conference Object Citation - Scopus: 2A Multi-Band Textile-Based Mtm Absorber for Energy Harvesting Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Allam, A.M.M.A.; Helala, M.A.; Fawzy, Diaa E.; Abbas, M.A.; Sree, M.F.A.; Parchin, N.O.; Amar, A.S.I.This paper is devoted to design and implementation of multi-band textile based Metamaterial absorber operating at K and Ku bands to be deployed in energy harvesting system. The unit cell of the absorber comprises a ground plane of copper annealed, Felt textile and top ground layer with etched Jerusalem cross surrounded with etched square ring. It provides three highly resonant peaks at 16.7 GHz, 18.6GHz, and 22.45 GHz, with absorption percentages of 99.8%, 96.5%, and 99.7%, respectively. The full width at half maximum (FWHM) is 3.35 GHz (19%) at 17.6 GHz. In addition, the absorber provides a wideband of absorption for oblique incidence up to 20 degrees and also at different bending radii. The relative permittivity and permeability are studied to demonstrate it effect on the absorption mechanism. A negative index of refraction is achieved over a band of 6.5 GHz from 16 GHz to 22.5 GHz, which leads to perfect absorptivity. © 2023 IEEE.Article Citation - WoS: 2Citation - Scopus: 3Theoretical Prediction of Chromospheric Oscillations in Late-Type Stars(Springer, 2016) Fawzy, Diaa E.; Musielak, Z. E.Self-consistent, nonlinear and time-dependent numerical computations of the excitation of chromospheric oscillations in a thin and non-isothermal magnetic flux tube embedded in magnetic-free atmospheres of late-type stars are performed. Longitudinal tube waves are considered and the wave energy spectra and fluxes generated in convective zones of these stars are calculated. The process of filtering the energy carried by longitudinal tube waves is investigated and both the local heating by shock waves as well as the excitation of chromospheric oscillations are studied. Cutoff frequencies of the resulting oscillations are computed numerically at different atmospheric heights in stars of different effective temperatures and gravities, and compared to three analytically derived cutoff frequencies. The obtained results show that the oscillation frequency ranges from 4 mHz for F5V stars to 20 MHz for M0V stars. It is pointed out that this frequency range may be relevant to the recent stellar p-mode observations made by the NASA space mission Kepler.Article A Data-Driven Approach To Arsenic Classification in Groundwater in Geothermal Systems: Meta-Analysis and Machine Learning Applications in Western Anatolia, Turkiye(Pergamon-elsevier Science Ltd, 2025) Somay-Altas, Melis; Kalkan, Mirkan Yusuf; Fawzy, Diaa E.Western Anatolia, T & uuml;rkiye, is renowned for its diverse geothermal resources, encompassing high, medium, and low enthalpy systems. While these systems are valuable for energy production and economic development, they are also associated with significant environmental challenges, particularly high concentration arsenic and boron contamination. This study highlights critical hotspots, including Sandikli (27 mg/L) and Banaz-Hamambogazi (95.64 mg/L), with arsenic levels far exceeding the World Health Organization's (WHO) maximum permissible limit of 10 ppb. Such contamination poses significant risks to water quality, agriculture, and public health, especially in major agricultural provinces like Aydin and Manisa. To address these challenges, machine learning models were applied to classify arsenic concentrations. Ensemble methods, including AdaBoost (ABC) and Extra Trees (ETC) classifiers, consistently outperformed others, showing high accuracy of about 97 % in distinguishing geochemical signatures and predicting arsenic levels. In contrast, the k-Nearest Neighbors Classifier (KNNC) proved less effective, with frequent misclassifications. The combination of machine learning and meta-analysis provided a robust framework for identifying spatial and temporal patterns of contamination, offering valuable insights for environmental monitoring. This approach not only enhanced the understanding of arsenic distribution in geothermal systems but also provided actionable insights for mitigating contamination risks. The findings underscore the importance of combining computational techniques with environmental geochemistry to improve the management of geothermal wastewater. Future research should expand these methodologies to other regions and contaminants, leveraging machine learning to develop more effective environmental protection strategies. This study demonstrates the potential of data-driven approaches to address critical environmental issues and supports sustainable development in geothermal-rich areas.Conference Object Design and Implementation of CP Antennas for Automotive and Radar Applications at 76.5 GHz(IEEE, 2025) Allam, A. M. M. A.; Mohamed, Moustafa S. A.; Ahmed, Basel; Alexan, Wassim; El-Damak, Dina; Fawzy, Diaa E.This paper presents an antenna designed for autonomous vehicles and MIMO radar systems. MIMO radar enhances detection and resolution by using multiple antennas. The research covers the design and performance evaluation of MIMO radar antennas, aiming to advance radar technology. The antenna is made on Rogers RO4003C (dielectric constant 3.55, thickness 0.203 mm) and operates at 76.5 GHz with single and multiple circularly polarized configurations. One antenna was fabricated, showing a strong correlation between simulated and measured reflection coefficients. Key parameters like the 2D radiation pattern, realized gain, and axial ratio are discussed. Circularly polarized (CP) antennas are favored for their advantages: orientation independence, reduced multi-path fading, and compatibility with linear polarization systems. The gain of the four-element CP antenna at 76.5 GHz reaches 8.23 dB as an array, intended for future MIMO radar applications to enhance field of view and angle resolution.
