MSA Repository "MSAR"

MSAR University's Digital Repository is a documentation and digitization of all university outcomes that are of effective value in the scientific and academic community and reflects the university's image, work, and effective contribution to society Through MSAR Digital Repository, the university managed to collect, store, archive and publish digital content - including documents, audio files, images and data sets - all in a safe place. MSAR is one of the strongest University Digital Repositories in Egypt and documented in the DSPACE community with its latest versions.

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MSA Journals 140
A Full content for MSA university Faculties Journals
MSA Theses 5
A digital collection of MSA University postgraduate theses, including PhD and Master’s theses, organized by academic degree and faculty.
MSA University Academic Graduation Projects 1153
A Full content for msa university Distinguished Graduation Projects Yearbook
MSA University Academic Research 3774
MSA University Campus 2
Images for MSA University " sites - building - landscape "

Recent Submissions

Performance Of Flowable Giomer Versus Nanofilled Flowable Composite With Or Without Giomer Coat In Conservative Occlusal Cavities: 18 Months Randomized Clinical Trial
(Cairo University, Faculty of Dentistry, 2026-07-01) Amina Ahmed Gaafar; Eman Aly Abouauf; Hebaallah Mohamed Taher
Aim: This study was conducted to evaluate clinical performance of flowable giomer and flowable resin composite coated with S-PRG in comparison to flowable resin composite as a preventative resin restoration in patients requiring minimally invasive simple class I cavities in permanent molars over 18 months test period. Subjects and methods: Patients with occlusal cavities in permanent molars with ICDAS score 2, were randomly assigned into three groups (n=14 each group, total =42). Group A1 received Flowable giomer, group A2 received Flowable Resin Composite with S-PRG coat applied biannually and group A3 (control) received flowable resin composite. All materials were utilized using the manufacturers’ instructions. Evaluation of restoration was carried out using FDI criteria and probes. Incidence of new carious lesions was evaluated using DIAGNOdent pen. All outcomes were measured at baseline (1 week after placement), after 6, 12, and 18 months. Results: DIAGNOdent scores showed significant intragroup improvements over time, while intergroup differences emerged at later follow-ups. Based on FDI criteria, no significant differences were found between materials. All restorations demonstrated 100% success and survival at 18 months. Conclusion: All tested materials showed similar clinical performance and absence of incidence of new carious lesions after 18 months follow-up.
Heavy Metal Adsorption on Microplastics: Adsorption Mechanisms, Influencing Factors, Analytical Techniques, Toxicological Implications, and Remediation Strategies
(John Wiley and Sons Inc, 2026-07-21) Amr G. Dardeer; Nashwa A. Shaaban; Ahmed Tawfik; Mohamed A. Hassaan; Uyiosa Osagie Aigbe; Ahmed El Nemr
Microplastics (MPs) act as reactive surfaces and carriers in aquatic systems, influencing the mobility, bioavailability, and toxicity of heavy metals. Recent research has clarified how heavy metals adsorb onto MPs, focusing on adsorption pathways, physicochemical factors, analytical methods, toxicological impacts, and remediation strategies. Metal binding to MPs depends on factors such as polymer type, particle size, aging, surface properties, zeta potential, pH, salinity, dissolved organic matter, temperature, and the presence of biofilms. Adsorption occurs through mechanisms including electrostatic interactions, surface complexation, ion exchange, pore filling, hydrogen bonding, van der Waals forces, cation–π interactions, surface precipitation, and biofilm-mediated binding. MP–metal interactions vary with environmental conditions; for example, salinity and dissolved organic matter can enhance or reduce adsorption, depending on metal speciation, polymer characteristics, and experimental conditions. Toxicological studies show that MPs carrying heavy metals can increase bioaccumulation and combined toxicity by promoting transport and cellular uptake. However, strong adsorption and limited desorption may sometimes reduce the bioavailability of dissolved metals. The Mediterranean Sea is a key case study due to its semi-enclosed nature, high urbanization, maritime activity, wastewater discharge, and significant plastic pollution, all of which heighten the importance of MP–metal interactions. There is an urgent need for standardized adsorption protocols, thorough in situ and ex situ characterization, ecologically relevant toxicological studies, and integrated remediation strategies addressing both MPs and associated heavy metals.
Multi-objective Optimization Approach of Enhancing Visual Comfort in Educational Buildings: A Case study-MSA University Classrooms, Egypt
(Assiut University, Faculty of Engineering, 2026-09-01) Manar Fouad Elsaeed Eltanbouly; Moemen Afify; Henar Aboelmagd
The design of shade devices and the window-to-wall ratio are crucial factors in enhancing visual comfort, productivity, and overall well-being in buildings. By managing the design and configuration of shade systems, it is possible to achieve ideal levels of Useful Daylight Illuminance (UDI) while reducing thermal discomfort from overheating and visual discomfort from glare. This research presents a multi-objective optimization (MOO) strategy for existing educational buildings that utilizes different geometric shapes to enhance the efficiency of daylight and visual performance. Using a parametric approach and evolutionary multi-objective computation via Wallacei-x plug-in for Grasshopper, various shading device opening ratios, shading geometry, and window material in existing educational buildings in West Cairo, Egypt, are implemented by implementing responsive façade systems. The study evaluates the impact of various fixed shading designs, including horizontal and vertical angled blinds, on daylight performance metrics such as Daylight Factor (DF), Useful Daylight Illuminance (UDI), and glare risk (DGP). While no shading allows for maximum sun penetration, it also causes severe over-illumination and glare. In contrast, inclined horizontal shade at 15° provides maximum visual comfort and equal illumination distribution, albeit with diminished daylight availability. Vertical blinds at 0° and 15° provide a balance of daylight reduction and glare control, giving realistic options. Building on these findings, the study investigates the performance of a responsive shading system with five different polygonal geometries in a controlled classroom setting. The simulation study shows that responsive shading provides a flexible, efficient daylighting strategy, surpassing static designs. Geometric diversity and adaptation are essential for enhancing indoor environmental quality in hot, arid regions. Solutions for existing buildings are explored, providing recommendations for shading devices geometry in university buildings in a hot and dry climate.
A Threshold Approach to Investigating Bitcoin's Environmental Impact
(London Academy of Science and Business, 2026-03-31) Doaa Mohamed Salman; Salma Mahran; Islam Abdelbary
The rapid growth of Bitcoin trading has created tension between financial innovation and environmental sustainability. While existing research has focused on mining energy consumption, the environmental consequences of trading activity – a primary economic driver – remain underexplored, particularly across different developmental contexts. This study examines whether Bitcoin trading volume affects progress toward Sustainable Development Goal 7 (SDG7), which mandates affordable and clean energy, and whether this relationship varies by developmental status and trading intensity. Utilising a balanced panel of 21 developed and developing countries from 2014 to 2023, we employ fixed-effects models, two-stage least squares instrumental variable regression, and threshold regression to analyse the relationship between Bitcoin trading activity and energy sustainability outcomes. The results reveal significant developmental asymmetry. In developing economies, high-volume Bitcoin trading regimes—exceeding a critical threshold of approximately $28.4 trillion in annual volume—are associated with a statistically significant deterioration in SDG7 progress (coefficient = -0.0153, p = 0.031). This effect operates through increased reliance on carbon-intensive electricity generation rather than aggregate energy consumption. No significant impact is observed in developed economies. The allocation of trading volume by exchange denomination may introduce measurement bias, and the analysis does not capture subnational variation in mining concentration. Subsequent studies should employ subnational data, extend analysis to other cryptocurrencies, and investigate which specific institutional characteristics most effectively mitigate environmental damage. Bitcoin's environmental impact is neither uniform nor linear but conditional on institutional context and trading intensity, underscoring the need for context-sensitive, volume-dependent regulatory interventions.
Assessment of cell viability of heat cured and 3D printed denture base resins on humans’ oral epithelial cells, and rats’ hepatic and myocardial cells
(BioMed Central Ltd, 2026-07-15) Ahmed N. Elsherbini; Nancy N. Elsherbini; Tasneem M Soliman; Mona El-Deeb
Objectives: Denture base materials contain unreacted monomers, which may act as bioactive compounds and affect cells and tissues in vital organs such as the liver and heart. The aim of this study was to assess the cytotoxic and cell viability effect of 3 Dimensional printed (3D) and heat cured acrylic (HCR) denture base resins on oral epithelial cells in humans and hepatic and myocardium cells in rats. Materials and methods: The Sulfo-rhodamine B (SRB) assay was used to evaluate cell viability. In 96-well plates, aliquots of 100 µL cell suspension (5 × 103cells) were incubated for 24 h. Another aliquot of 100 µL media containing denture base materials, acrylic resin (heat cured acrylic resin; Acrostone) and 3D printed resin (Denture bases; iFun) in different concentrations, 0.00(control), 0.01, 0.1, 1, 10, and 100 µg/ml were used to treat the cells of human oral epithelial cells, rats’ hepatic and myocardium cells. Results: There was a concentration dependent decrease in the cell viability of human oral epithelial cells, and rats’ hepatic and myocardium cells in both heat cured acrylic resin and 3D printed resin.100ug/ml concentration caused the highest decrease in cell viability percentage. However, there was a statistical significant difference between all concentrations in the 3 cell lines. Also, morphological picture showed the heat cured resin had a more deteriorating changes in the 3 cell lines more than 3D printed resin. Conclusion: 3D printed and heat cured acrylic denture base resins seemed to affect cell viability of human’s oral epithelial cells and rats’ hepatic and myocardium cells to some degree but without reaching cytotoxicity thresholds. Clinical relevance: Denture wearers wear their dentures for long period of time, and as dentures are made up of chemicals which may have a deteriorating effect on the patients’ general health. This research investigates which denture base material to be considered as the most biocompatible and safe for patients’ usage. Also, helps practitioners in choosing the more biocompatible material for their patients.