Ahmed S. Alshammari
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View article: M-estimation activation functions for high-performance extreme learning machine ensemble classification
M-estimation activation functions for high-performance extreme learning machine ensemble classification Open
View article: The Role of Bandage Contact Lenses Versus Amniotic Membrane in Corneal Wound Healing: A Systematic Review
The Role of Bandage Contact Lenses Versus Amniotic Membrane in Corneal Wound Healing: A Systematic Review Open
Corneal wound healing plays a vital role in restoring ocular surface integrity following injury or disease. Both bandage contact lenses (BCLs) and amniotic membranes (AM) are non-pharmacologic interventions widely used in ocular surface di…
View article: A Case Series: Methylene-Blue-Related Toxic Anterior Segment Syndrome
A Case Series: Methylene-Blue-Related Toxic Anterior Segment Syndrome Open
An intracameral injection of methylene blue 1% during cataract surgery induces extreme cytotoxicity, primarily affecting the corneal endothelium and iris epithelium. This case series illustrates the clinical presentation, management, and o…
View article: Potential protective effect of bacterial prodigiosin on the pancreas in diabetic rats: alleviating inflammation, oxidative stress, and histological damage with antidiabetic properties
Potential protective effect of bacterial prodigiosin on the pancreas in diabetic rats: alleviating inflammation, oxidative stress, and histological damage with antidiabetic properties Open
The goal of this study was to examine, for the first time, the effects of prodigiosin (PG) administration on key inflammation enzymes, lymphocyte infiltration, oxidative status, as well as hepatic and renal function in diabetic rats. The r…
View article: Coupled split square resonator based metamaterial sensor for realtime monitoring of air bubbles in IV channels
Coupled split square resonator based metamaterial sensor for realtime monitoring of air bubbles in IV channels Open
View article: Impact of Lifestyle Interventions on the Progression of Diabetic Retinopathy in Patients Diagnosed With Diabetes Mellitus: A Systematic Review
Impact of Lifestyle Interventions on the Progression of Diabetic Retinopathy in Patients Diagnosed With Diabetes Mellitus: A Systematic Review Open
View article: Toral $(m,C)$-isometric multivariable operators
Toral $(m,C)$-isometric multivariable operators Open
In recent years, various aspects of the problem related to the generalization of the class of m -isometries of commuting tuples of operators in Hilbert spaces have appeared in the literature. Let us mention, for example, $(n_{1},\ldots ,n_…
View article: Long-Term Outcomes of Mitral Valve Repair Versus Replacement in Patients with Ischemic Mitral Regurgitation: A Retrospective Propensity-Matched Analysis
Long-Term Outcomes of Mitral Valve Repair Versus Replacement in Patients with Ischemic Mitral Regurgitation: A Retrospective Propensity-Matched Analysis Open
Background: The optimal surgical management of ischemic mitral regurgitation (IMR)—mitral valve repair (MVr) versus mitral valve replacement (MVR)—remains controversial, with limited evidence on long-term outcomes. This study aimed to comp…
View article: Advanced energy conversion strategies using multistage radial turbines in Organic Rankine Cycles for low-grade heat recovery
Advanced energy conversion strategies using multistage radial turbines in Organic Rankine Cycles for low-grade heat recovery Open
The transition from fossil fuels to renewable energy is a critical process that demands technological advancements in energy conversion systems. Among these, the Organic Rankine Cycle (ORC) has emerged as a promising solution for harnessin…
View article: DNA-based cryptosystem integrating Wichmann-Hill and mixed congruence algorithms for enhanced data security
DNA-based cryptosystem integrating Wichmann-Hill and mixed congruence algorithms for enhanced data security Open
This paper proposes a DNA-based cryptosystem integrating the Wichmann-Hill Algorithm (WHA) and Mixed Congruence Algorithm (MCA) to enhance encryption security. By employing WHA and MCA as hybrid pseudo-random number generators (PRNGs), the…
View article: Three-Dimensional Computational Fluid Dynamics-Based Improvements in Radial Turbine Design for Enhanced Thermal Energy Utilization: A Case Study in Ha’il Cement Company
Three-Dimensional Computational Fluid Dynamics-Based Improvements in Radial Turbine Design for Enhanced Thermal Energy Utilization: A Case Study in Ha’il Cement Company Open
Organic Rankine cycles (ORCs) are increasingly employed in power plants to recover waste energy and reduce environmental impacts. The radial turbine, a critical ORC component, experiences flow losses influenced by design parameters such as…
View article: Dual band angle insensitive metamaterial absorber with MgxCa(0.90−x)Ni0.10Fe2O4 based novel microwave flexible substrate for electromagnetic energy harvesting application
Dual band angle insensitive metamaterial absorber with MgxCa(0.90−x)Ni0.10Fe2O4 based novel microwave flexible substrate for electromagnetic energy harvesting application Open
This article presents a metamaterial absorber originated on a flexible substrate of MgxCa(0.90−x)Ni0.10Fe2O4. The MgxCa(0.90−x)Ni0.10Fe2O4 substrate is developed using the sol-gel technique, where X25, X50, and X75 represent 25%, 50%, and …
View article: Hemorrhage Control Tourniquets, Pressure, and Wound Firstaid by Red Crescent
Hemorrhage Control Tourniquets, Pressure, and Wound Firstaid by Red Crescent Open
Hemorrhage control is a critical component of trauma management, especially in cases of severe bleeding from extremity injuries. One of the most effective tools for controlling life-threatening hemorrhage is the use of tourniquets. When ap…
View article: Polarization-independent high-sensitive metamaterial sensor for chemical sensing and EMI shielding application
Polarization-independent high-sensitive metamaterial sensor for chemical sensing and EMI shielding application Open
Chemical sensing is essential for characterizing liquid chemical samples in the chemical industry. Consequently, Electromagnetic interference (EMI) shielding is crucial for promising the reliable functioning of diverse electronic devices. …
View article: Eco-friendly magnetic activated carbon modified with green tea extract for efficient adsorption of thiazine and azo dye contaminants from water
Eco-friendly magnetic activated carbon modified with green tea extract for efficient adsorption of thiazine and azo dye contaminants from water Open
Maghemite-supported activated carbon loaded with green tea extract, an adsorbent for the removal of MB and MO dyes from water.
View article: Cyanoethyl cellulose–based molecularly imprinted polymer for selective S-suprofen recognition
Cyanoethyl cellulose–based molecularly imprinted polymer for selective S-suprofen recognition Open
View article: A study of $ (m, q) $-isometric multimappings in the context of $ \mathcal{G} $-metric spaces
A study of $ (m, q) $-isometric multimappings in the context of $ \mathcal{G} $-metric spaces Open
This paper introduces and explores new concepts of $ (m, q) $-isometric multimappings in the context of extended metric structures. These newly defined concepts serve as extensions of the existing theory of $ (m, q) $-isometric multimappin…
View article: Comprehensive Review of Skill Development and Role Integration between Nurses and Nurse Assistants in Modern Healthcare
Comprehensive Review of Skill Development and Role Integration between Nurses and Nurse Assistants in Modern Healthcare Open
Today, the versatile functions the nurses and nurse assistants perform are critically important to healthcare. This article focuses on skill acquisition, job overlapping, and the relationship between these two important healthcare position…
View article: Critical Analysis of Nursing Roles in An Evolving Healthcare Landscape
Critical Analysis of Nursing Roles in An Evolving Healthcare Landscape Open
The status of nurses working in healthcare facilities has transformed in terms of the relevance of their work to emerging healthcare systems. Taken within the context of a transforming healthcare system, this paper aims to critically discu…
View article: Polarization-selective metamaterial absorber using tailored Y-shaped SRR for UWB device and Doppler navigation aids applications
Polarization-selective metamaterial absorber using tailored Y-shaped SRR for UWB device and Doppler navigation aids applications Open
In this paper, we present an unprecedented metamaterial absorber design exhibiting exceptional characteristics in electromagnetic wave absorption. The proposed bent Y-shaped structure, fabricated on an FR-4 substrate with copper patches, s…
View article: Impact of thermal treatment on halloysite nanotubes: A combined experimental-computational approach
Impact of thermal treatment on halloysite nanotubes: A combined experimental-computational approach Open
Halloysite nanotubes (HNTs) are naturally occurring aluminosilicate minerals, known for their unique tubular structure, which have garnered significant interest for a wide range of applications. This study explores the morphological change…
View article: Metamaterial loaded miniaturized extendable MIMO antenna with enhanced bandwidth, gain and isolation for 5G sub-6 GHz wireless communication systems
Metamaterial loaded miniaturized extendable MIMO antenna with enhanced bandwidth, gain and isolation for 5G sub-6 GHz wireless communication systems Open
Multiple-input multiple-output (MIMO) antennas are crucial for fifth-generation (5G) communications that enhance data transmission rate, spectrum utilization, channel quality, and reliability. State-of-the-art research shows that the 5G fr…
View article: Corrigendum to “Maze-enclosed quad symmetric kite shaped SRR based metamaterial absorber for doppler navigation aids and earth exploration satellite remote sensing services” [Alex. Eng. J. 100 (2024) 357–368]
Corrigendum to “Maze-enclosed quad symmetric kite shaped SRR based metamaterial absorber for doppler navigation aids and earth exploration satellite remote sensing services” [Alex. Eng. J. 100 (2024) 357–368] Open
View article: Comparative analysis of machine learning techniques for metamaterial absorber performance in terahertz applications
Comparative analysis of machine learning techniques for metamaterial absorber performance in terahertz applications Open
Metamaterial absorbers (MMAs) have tremendous potential for controlling and modulating Terahertz electromagnetic (EM) waves. It is challenging to design MMAs for optimal performance using conventional methods due to their time-consuming an…
View article: Maze-enclosed quad symmetric kite shaped SRR based metamaterial absorber for doppler navigation aids and earth exploration satellite remote sensing services
Maze-enclosed quad symmetric kite shaped SRR based metamaterial absorber for doppler navigation aids and earth exploration satellite remote sensing services Open
This paper represents a wide incident angle-polarization insensitive, stable in results, and compact-sized metamaterial absorber that can be used for Doppler navigation aids and remote sensing applications in Earth Exploration Satellite Se…
View article: Structural, morphological, optical, electrical, and magnetic properties of aluminum-doped CoxCa(0.90−x)Ni0.10Fe2O4 flexible substrate for visible to NIR spectra applications
Structural, morphological, optical, electrical, and magnetic properties of aluminum-doped CoxCa(0.90−x)Ni0.10Fe2O4 flexible substrate for visible to NIR spectra applications Open
This paper presents a conductive component tailored to a flexible substrate using Al-doped CoxCa(0.90−x)Ni0.10Fe2O4 (x = 0.25, 0.50, and 0.75) for visible to near-infrared (NIR) spectra in magneto-optical applications. The developed nanopa…
View article: Impact of turbine characteristics on low temperature organic Rankine cycles operating with zeotropic and azeotropic mixtures
Impact of turbine characteristics on low temperature organic Rankine cycles operating with zeotropic and azeotropic mixtures Open
The urgent need to mitigate the environmental impacts of fossil fuel combustion has spurred interest in renewable energy sources for electricity generation, particularly solar organic Rankine cycles (ORCs). This study investigates the pote…
View article: Polarization-Selective Metamaterial Absorber Using Tailored Y-Shaped SRR for UWB Device And Doppler Navigation Aids Applications
Polarization-Selective Metamaterial Absorber Using Tailored Y-Shaped SRR for UWB Device And Doppler Navigation Aids Applications Open
View article: High quality factor double negative metamaterial for textile fabric and fabric moisture sensing applications
High quality factor double negative metamaterial for textile fabric and fabric moisture sensing applications Open
This study introduces an innovative high-Quality factor (Q-factor) double negative (DNG) metamaterial sensor designed for textile fabric and fabric moisture sensing applications in the dynamic realm of textile innovation. The sensor is spe…
View article: Morphological, optical, and electrical properties of CoxCa(0.90-x)Ni0.10Fe2O4 based flexible metamaterial substrate for industrial chemical contamination sensing
Morphological, optical, and electrical properties of CoxCa(0.90-x)Ni0.10Fe2O4 based flexible metamaterial substrate for industrial chemical contamination sensing Open
State-of-the art research on conventional microwave substrates reveals limitations of restricted flexibility, poor adaptability to irregular surfaces, and reduced effectiveness in complex sensing environments, leading to the development of…