Gadelmavla, Diaa

Profile Picture
Profile URL
https://hdl.handle.net/20.500.14365/7120
Name Variants
Fawzy, D
Gadelmavla, Dıaa
Fawzy, Diaa
Fawzy, Diaa E.
Fawzy, DE
Fawzy, D. E.
Job Title
Email Address
diaa.gadelmavla@ieu.edu.tr
Main Affiliation
05.01. Aerospace Engineering
Status
Current Staff
Website
ORCID ID
0000-0003-1993-0681
Scopus Author ID
23011278600
Turkish CoHE Profile ID
B65AEF1DD0544DCE
Google Scholar ID
kS7UgeIAAAAJ
WoS Researcher ID
AAI-9208-2021
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Diaa_Gadelmavla.png (100.51 KB)

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ZERO HUNGER2
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QUALITY EDUCATION4
QUALITY EDUCATION
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CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
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AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
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DECENT WORK AND ECONOMIC GROWTH8
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INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
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Documents

71

Citations

591

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Documents

30

Citations

351

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Scholarly Output

72

Articles

25

Views / Downloads

92/1850

Supervised MSc Theses

4

Supervised PhD Theses

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WoS Citation Count

206

Scopus Citation Count

383

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WoS Citations per Publication

2.86

Scopus Citations per Publication

5.32

Open Access Source

19

Supervised Theses

4

JournalCount
Monthly Notıces of the Royal Astronomıcal Socıety8
Proceedings - 2023 10th International Conference on Electrical and Electronics Engineering, ICEEE 20234
Astrophysıcs And Space Scıence4
2022 9Th Internatıonal Conference on Electrıcal And Electronıcs Engıneerıng (Iceee 2022)3
2023 International Telecommunications Conference, ITC-Egypt 20233
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  • Thumbnail Image
    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, Dıaa
    Dağıtım 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.
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    Master Thesis
    Development of Millimeter Wave System Components for 5g/6g Wireless Networks
    (İzmir Ekonomi Üniversitesi, 2022) Cengiz, Mehmet Faruk; Gadelmavla, Dıaa
    Bu 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.
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    Article
    Citation - WoS: 3
    Citation - Scopus: 3
    Theoretical 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.
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    Conference Object
    Citation - WoS: 3
    Citation - Scopus: 5
    Interfacing Wideband Amplifiers Using Ridge Gap Waveguide for Mm-Wave Systems
    (Institute of Electrical and Electronics Engineers Inc., 2020) 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.
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    Conference Object
    Citation - Scopus: 1
    Re-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.; El-Din, M.S.H.Salah
    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.
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    Article
    Citation - WoS: 26
    Citation - Scopus: 28
    The 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.
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    Conference Object
    Design and Implementation of an Antenna for Automotive Applications at 76.5 Ghz
    (Institute of Electrical and Electronics Engineers Inc., 2024) Mohamed, M.S.A.; Esam, G.; Allam, A.M.M.A.; Alexan, W.; Gadelmavla, Diaa; Şahin, Osman Nuri; Fawzy, Diaa E.
    This paper presents an antenna candidate for automotive cars and MIMO radar applications. It is implemented on Rogers RO4003C with a relative dielectric constant of 3.55 and a thickness of 0.203 mm. Linearly and circularly polarized versions of printed antennas are presented and operate at 76.5 GHz, which meets the characteristics of the required application. One of the antennas is selected and fabricated for validation. The results of the reflection coefficient fo und good agreement between the simulated and measured ones. Further antenna parameters like 3D and 2D radiation patterns, realized gain and axial ratio are illustrated. © 2024 IEEE.
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    Conference Object
    Development of a Split Ring Resonator Sensor for Vibration Detection
    (Institute of Electrical and Electronics Engineers Inc., 2024) 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.
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    Conference Object
    Citation - WoS: 5
    Citation - Scopus: 19
    Dual Band Siw Patch Antenna Based on H-Slotted Dgs for Ku Band Application
    (Institute of Electrical and Electronics Engineers Inc., 2020) 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.
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    Conference Object
    Citation - Scopus: 1
    Design and Implementation of CP Antennas for Automotive and Radar Applications at 76.5 GHz
    (IEEE, 2025) Allam, Amma; Mohamed, Moustafa S. A.; Ahmed, Basel; Alexan, Wassim; El-Damak, Dina; Fawzy, Diaa
    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. © 2025 Institut fur Mikrowellen und Antennentechnik - IMA.