Helwan University

ON PAIRWISE ALMOST QUASI-CONTINUOUS MAPPINGS IN BITOPOLOGICAL SPACES

Almost quasi-continuity, introduced by Popa (1978) in the setting of classical topological spaces, has played an important role in the development of generalized continuity concepts. Motivated by the increasing interest in continuity notions within bitopological frameworks, this...

Stall mitigation and performance enhancement in axial-flow air turbines using a hybrid passive–active flow control strategy

Harvesting maximum energy from axial turbines remains a significant challenge, particularly under stall conditions. Wells turbine, commonly used as self-rectifying axial turbine in wave energy conversion (WEC) systems, is limited by a narrow operating range, low power output, and...

A Layered Decision-Aware Forecasting Architecture for Noisy Panel Environments

Machine learning forecasting systems in noisy, non-stationary, multi-entity environments are commonly optimized for pointwise predictive accuracy, although many downstream decisions depend on the relative ordering of entities rather than exact numerical forecasts. This creates a...

Bio-Inspired lattice-based cranial implants: comparative finite element analysis of topology-dependent mechanical performance, energy absorption, and osseointegration potential

Cranioplasty implants must provide mechanical protection while remaining lightweight and promoting biological integration. This study investigates bio-inspired lattice-based cranial implants incorporating four topologies: body-centred cubic (BCC), cubic, honeycomb and re-entrant....

Carotid artery stenting utilizing self-expansion without post-stenting angioplasty in patients at high risk for reperfusion injury (a pilot study of a technical modification)

Carotid artery stenosis accounts for 15–20% of cerebrovascular ischemic strokes. Endovascular carotid artery stenting (CAS) has been recognized as an alternative treatment method for carotid artery stenosis with outcomes similar to carotid endarterectomy (CEA) [ 1 ]. One of the m...

Oncology nurse navigator core competencies and patient satisfaction

Oncology nurse navigators (ONNs) are increasingly recognized for their vital role in improving the quality of cancer care by supporting patients throughout their treatment journey. In Egypt, nurse navigation implementation remains limited, and empirical evidence examining the rel...

Caspase-11–mediated hyperinflammation impairs CD8+ T cell immunity and viral clearance in severe SARS-CoV-2 infection

Severe SARS-CoV-2 infection is characterized by lung hyperinflammation, impaired IFN responses, and defective T cell activation, yet the molecular drivers of these immune dysregulations remain incompletely understood. Caspase-11 (CASP11), a key effector of the noncanonical inflam...

Branding the skyline: the role of signature architecture in shaping creative city identity

This study explores the intersection between destination marketing and urban creativity through the investigation of how destination awareness, image and quality can shape perceptions of city creativity through the mediation of signature buildings. Being grounded in Symbolic Inte...

Dual-fractional nonlocal photo-thermoelastic waves in microelongated semiconductor metamaterial interfaces with variable thermal conductivity

Purpose Unlike previous studies that investigated these mechanisms individually, the present work establishes a unified analytical formulation that elucidates their mutual interaction and reveals new coupled wave characteristics arising from the simultaneous effects of thermal me...

Distinguishing plant biophysical stress responses from temporal variability using vis–NIR spectroscopy

Visible–near infrared (Vis—NIR) spectroscopy is widely used for non-destructive plant monitoring; however, in time-series experiments, signals of interest are frequently masked by diurnal rhythms and systematic measurement drift. This limits the ability to clearly detect plant re...

Aucubin Ameliorates Alloxan-Induced Diabetic Liver Injury in Association with Modulation of the Nrf2/HO-1 Antioxidant Axis and NF-κB-Associated Inflammatory and Apoptotic Signaling

Diabetes mellitus is associated with progressive hepatic injury driven by oxidative stress, inflammation, and apoptosis. Aucubin, a natural iridoid glycoside, possesses potent antioxidant and anti-inflammatory activities; however, its hepatoprotective mechanisms in diabetic liver...

Back to the future of sustainability: how social media influencers activate norms for sustainable fashion consumption among Gen Z

Purpose This study examines the impact of influencer marketing on Generation Z’s sustainable fashion consumption intention (SFCI) in Egypt by integrating the stimulus–organism–response (SOR) framework with the norm activation model (NAM). Design/methodology/approach Data were col...

Analytical modeling and FEM simulation of slotted piezoelectric arrays for vibration energy harvesting

Abstract This work investigates a cantilever-based piezoelectric energy harvester incorporating designs with different slot shapes. The finite element method and analytical modeling are employed to study and compare several slot geometries, including rectangular, triangular, symm...

Synthesis and in silico studies of hexahydroacridine derivatives as potential antitumor agents

Abstract Despite advances in targeted cancer therapies, drug resistance and off-target toxicity remain major challenges, underscoring the need for new multi-targeted agents with improved selectivity. The present study evaluated the anticancer potential of newly synthesized hexahy...

Sustainable utilization of Egyptian waste cooking oil biodiesel in diesel engines: performance and emission characteristics

Abstract This study experimentally evaluated waste cooking oil (WCO) biodiesel–diesel blends in an unmodified single-cylinder direct injection diesel engine operated at 1500 rpm under no load and 1–5 kW load conditions. Diesel and B10–B50 were compared in terms of brake-specific...

A model predictive control-based energy management strategy for grid-connected nanogrids

Abstract Nanogrids have emerged as a crucial solution for contemporary residential power systems, providing a robust framework for integrating distributed energy resources (DERs), comprising solar photovoltaics (PVs), wind turbines (WTs), energy storage systems (ESSs), and diesel...

Optimal Operation of Self-Healing Networked Microgrids Using Pufferfish Optimization Algorithm

This paper presents an approach for optimal operation of self-healing networked microgrids (NMGs) under both normal operation and emergency conditions using the pufferfish optimization algorithm (POA). The proposed methodology is based on an energy management system (EMS) with tw...

A reinforcement learning-driven adaptive hybrid PLC-RF communication architecture for IoT-based smart metering systems

Abstract With the rapid expansion of smart grid infrastructure, robust and scalable communication is essential to support Advanced Metering Infrastructure (AMI). This paper presents a hybrid communication architecture that combines Power Line Communication (PLC) and Radio Frequen...

Cold and hot tumors: immunological determinants, cancer-immunity cycle dysregulation, and nanotechnology-driven therapeutic approaches

Abstract Cancer remains a major global health burden and the second leading cause of mortality worldwide. Recent advances in cancer immunotherapy have emphasized the critical role of the tumor microenvironment (TME) in determining therapeutic outcomes, leading to the classificati...

Synthesis and molecular docking of novel pyrazole, pyrimidine, and pyridine derivatives as potent antimicrobial, antibiofilm, and anticancer agents

Abstract The development of novel antimicrobial and anticancer agents remains a priority due to rising drug resistance and high systemic toxicity of current treatments. A series of novel pyrazole ( 2–6 ), pyrimidine ( 7–10 ), and pyridine/oxazinone ( 11–14 ) derivatives were synt...