Publications by authors named "A R Shamma"
This study introduces a novel technique for achieving the global peak (GP) in solar photovoltaic (PV) systems under partial shadowing conditions (PSC) using the Dandelion Optimizer Algorithm (DOA), inspired by the dispersal of dandelion seeds in the wind. The proposed approach aims to enhance the power generation efficiency of PV systems across various scenarios, including dynamic uniform, dynamic PSCs, static uniform irradiances, and static PSCs. The proposed approach improves tracking efficiency, provides non-oscillatory steady-state responses, and reduces transients as well as enhancing the dynamic performance of the whole system.
View Article and Find Full Text PDFObjectives: This study aims to assess and compare the micro-shear bond strength (SBS) of a novel resin-modified glass-ionomer luting cement functionalized with a methacrylate co-monomer containing a phosphoric acid group, 30 wt% 2-(methacryloxy) ethyl phosphate (2-MEP), with different substrates (dentin, enamel, zirconia, and base metal alloy). This assessment is conducted in comparison with conventional resin-modified glass ionomer cement and self-adhesive resin cement.
Materials And Methods: In this study, ninety-six specimens were prepared and categorized into four groups: enamel (A), dentin (B), zirconia (C), and base metal alloys (D).
Carbon dioxide (CO) emissions result from human activities like burning fossil fuels. CO is a greenhouse gas, contributing to global warming and climate change. Efforts to reduce CO emissions include transitioning to renewable energy.
View Article and Find Full Text PDFArticle Synopsis
- Traumatic brain injury (TBI) can lead to long-term issues for veterans, such as PTSD, depression, and anxiety, particularly among Special Operations Forces veterans (SOVs).
- A study called MISTIC explored the use of magnesium combined with the plant-derived compound ibogaine, focusing on its effects on 30 male SOVs with mild TBI.
- The study reported significant improvements in functioning and reductions in PTSD, depression, and anxiety one month after treatment, with no major adverse effects noted, but further clinical trials are necessary to confirm these results.
Aim: To evaluate and compare the marginal adaptation and fracture resistance of resin matrix ceramic crowns fabricated using 3D printing and CAD/CAM milling technology.
Materials And Methods: Thirty extracted human maxillary first premolars were prepared to receive crown restorations and grouped into three groups according to different crown materials used (n = 10): 1) VE: teeth restored with CAD/CAM-milled Vita Enamic; 2) CS: teeth restored with CAD/CAM-milled Cerasmart 270; VSC: teeth restored with 3D-printed VarseoSmile Crown plus. Marginal analysis was performed with the aid of a digital microscope at 230x magnification both before and after cementation with self-adhesive resin cement, and analyzed with ImageJ analysis software.