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Multifunctional topological photonic crystal device for multichannel frequency routing and highly sensitive refractive index sensing

Research Authors
Naglaa AbdelAll, Mohamed Almokhtar, Ghada Khouqeer, Mohamed Saleh M Esmail, Israa Abood, Sayed El Soliman
Research Date
Research Department
Research Journal
Physica Scripta
Research Vol
99
Research Year
2024

Synthesis, characterization, and optical sensing of hydrophilic anodic alumina films

Research Abstract
Research Authors
Mohamed Almokhtar Mohamed
Research Date
Research Department
Research Journal
Optical Materials
Research Pages
116390
Research Publisher
North-Holland
Research Year
2024

Rainbow trapping with engineered topological corner states and cavities in photonic crystals

Research Authors
Naglaa AbdelAll, Mohamed Almokhtar, Ghada Khouqeer, Israa Abood, Sayed El. Soliman
Research Date
Research Department
Research Journal
Advanced Quantum Technologies
Research Vol
7
Research Year
2024

Electrodeposition of a novel porous, crystalline Cd-rich CdS nanonoodles on ZnO nanosheets for enhanced solar light-driven water splitting

Research Abstract

Solar light-driven water splitting offers a sustainable pathway for energy conversion. This study presents a straightforward electrodeposition method for decorating ZnO nanosheets with CdS nanonoodles, varying the deposition time. Structural and morphological analysis confirmed the formation of a crystalline, Cd-rich hexagonal CdS phase on the ZnO nanosheets, exhibiting a unique nanonoodles morphology. The thickness of the CdS/ZnO nanonoodles gradually increased to 30 μm with extended deposition times. Notably, the valence band of the hybrid CdS/ZnO nanonoodles exhibit a lower binding energy compared to both CdS nanonoodles and ZnO nanosheets, highlighting interfacial charge transfer and enhanced synergy. The hybrid CdS/ZnO nanonoodle photoanode, fabricated with a 60-min deposition time, exhibits a reduced band gap of 2.8 eV compared to the 3.2 eV band gap of the pristine ZnO nanosheets. This reduction in the band gap indicates enhanced solar light absorption capabilities. The CdS/ZnO nanonoodles demonstrate a gradual improvement in the photoelectrochemical water splitting efficiency with increasing deposition time. The hybrid photoanode achieves a remarkable photocurrent density of 9.49 mA cm−2 at 1.23 V vs. reversible hydrogen electrode (RHE), representing a 20-fold increase compared to the ZnO nanosheets (0.46 mA cm−2) and a 7-fold increase compared to the CdS nanonoodles (1.45 mA cm−2). This heterostructured CdS/ZnO nanonoodles hybrid photoanode achieves an impressive conversion efficiency of 9.21 % at 0.4 V vs. RHE.

Research Authors
A.G. Abd-Elrahim, Manar A. Ali, Doo-Man Chun
Research Date
Research Department
Research Journal
Journal of Power Sources
Research Pages
237950
Research Publisher
Elsevier
Research Rank
International Journal
Research Vol
655
Research Website
https://doi.org/10.1016/j.jpowsour.2025.237950
Research Year
2025

Revealing the past of Ginah archaeological site by enhancing GPR images to understand ancient periods at Kharga Oasis, Egypt

Research Abstract

Ground-penetrating radar (GPR) is a noninvasive near-surface geophysical method. This method
is beneficial for imaging, characterization, and intrasite analysis of buried archaeological remains
within culture sediments at Ginah archaeological site. The investigation of these targets has intrinsic
value and has never been conducted at this site. In this study, GPR can be utilized to conduct a more
focused survey on individual features and understand their structures, dimensions, and depths. The
field survey on the studied area was conducted by SIR 4000 with 200 and 400-MHz antennae using
RADAN 7 software. The processed GPR radargrams, depth slices, and 3D subvolumes are used to
illustrate typical georadar facies associated with the stratigraphy and architectural elements of the
buried archaeological remains. The facies analysis helps to identify the nature of cultural sediment,
constructed materials, and the anticipated archaeological artifacts at various depths. These detected
features are beneficial for presenting a compelling justification of nature, constituents, architectural
patterns, and historical cultures. Also, this information is used to make guesses based on what is
seen in the field and the archaeological history found in the ruins of Ginah, Al-Ghuieta, and Al-Zayyan
fortresses along the Darb El-Arbine route. This information is essential to assume different successive
ancient periods at the examined site, which can help specialists hasten their excavations.

Research Authors
Mohamed Osman Ebraheem, Hamza Ahmed Ibrahim , & Mahmoud Mohamed Zalat
Research Date
Research Department
Research Journal
Scientific Reports
Research Member
Research Pages
26478
Research Publisher
springier nature
Research Rank
Q1
Research Vol
15
Research Website
https://doi.org/10.1038/s41598-025-10570-5
Research Year
2025

Analyzing and Controlling chaos phenomena in fractional chaotic supply chain models

Research Abstract

Supply Chain Management (SCM) is a critical business function that involves the planning, coordination,
and control of the flow of goods, information, and finances as they move from the
manufacturer to the wholesaler to the retailer and finally to the end customer. SCM is a holistic
approach to managing the entire process of delivering products or services to consumers. In this
study, we will enhance the findings as outlined in Anne et al. (2009). While certain attributes of
these systems will have been investigated, numerous aspects of these systems will still require
further scrutiny. This calls for additional research studies on these systems. This paper examines a
Fractional-Order Supply Chain Management (FOSCM) model utilizing the Adomian Decomposition
Method (ADM) and explores qualitative aspects through an approach that addresses existence
and uniqueness. By using Arzel`a–Ascoli’s principle, this system proves that the Caputo
FOSCM model has at least one solution. Furthermore, we investigate the dynamics of the system
by using the Lyapunov Exponent (LE), Bifurcation Diagram (BD), Complexity Analysis (CA) and
0–1 test. Finally, we introduce the control for FOSCM model using the Linear Feedback Control
(LFC) method. We verify the correctness of our analysis by using numerical simulations.

Research Authors
Muhamad Deni Johansyah, Aceng Sambas, Song Zheng, Sania Qureshi, Tarek M. Abed-Elhameed, Sundarapandian Vaidyanathan
Research Date
Research Department
Research Image
Research Journal
Heliyon
Research Pages
e34703
Research Publisher
Science Direct
Research Rank
َQ1
Research Vol
10
Research Website
https://doi.org/10.1016/j.heliyon.2024.e34703
Research Year
2024
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