Azarbaijan Shahid Madani University, (Persian: دانشگاه شهید مدنی آذربایجان, Danushgah-e Shihid-e Midâni-ye Âzerbaijan) commonly called only Azarbaijan University, is a public university located near Tabriz, East Azerbaijan Province, Iran, founded in 1987. The university provides both undergraduate and graduate education to approximately 7,500 students at a wide range of fields including engineering, basic sciences, literature and theology. The university has got Research Gate's total impact point of 1716.47 from 61 publications, according to the latest statistics.
The increasing demand for antibacterial and biocompatible materials in biomedical applications prompts the development of titanium-copper (Ti-Cu) alloys as promising candidates. These alloys attract wide attention due to their potent antibacterial activity against various bacteria. This study thoroughly reviews the antibacterial properties, biocompatibility, and corrosion performance of Ti-Cu alloys in different circumstances. The effects of copper content, processing routes, surface treatments, and other parameters on antibacterial efficacy, cytocompatibility, osseointegration, and corrosion resistance are analyzed. The investigation spans multiple length scales, examining factors from bulk alloy composition to microstructural features like intermetallic phases and their morphology, distribution, and surface characteristics including topography and wettability. Ultimately, the ongoing challenges associated with Ti-Cu biomedical alloys are critically evaluated, mapping out strategic research directions to fully harness their multifunctional capabilities.
In this work, a dual-mode hybrid photonic–plasmonic platform was designed, fabricated, and systematically characterized. The structure consists of a TiO₂ two-dimensional monolayer inverse opal (2D MIO) decorated with Au nanoparticles (AuNPs) via sputtering followed by thermal annealing. This fabrication strategy enabled spatially selective formation of quasi-spherical AuNPs predominantly within the bowl-shaped cavities, along with triangular-shaped AuNPs located at the interstitial junctions of the inverse opal lattice. Morphological characterization using field-emission scanning electron microscopy (FESEM) confirmed the formation of a highly ordered hexagonal TiO₂ 2D MIO and the successful incorporation of AuNPs with distinct spatial distributions. Optical characterization by UV–Vis spectroscopy (extinction mode) revealed a combined photonic–plasmonic response arising from the periodic TiO₂ architecture and the embedded Au nanostructures. A broad spectral feature in the 530–550 nm range is attributed to Bragg diffraction of the TiO₂ 2D MIO coupled with collective and lattice-modified plasmonic excitations of cavity-confined AuNPs. In addition, a distinct band near 740 nm originates from anisotropic triangular-shaped AuNPs and their coupling effects within the high-refractive-index TiO₂ environment. Finite-difference time-domain (FDTD) simulations reproduce the main spectral features and provide insight into the electromagnetic response of the system, revealing strong electric-field localization at cavity interfaces and nanoparticle junctions. The combined photonic–plasmonic interaction within this architecture demonstrates tunable optical behavior governed by geometry, periodicity, and dielectric environment, suggesting potential for future exploration in optical sensing and surface-enhanced spectroscopic applications.
This study investigates the combined effects of silica fume addition and variable steam-curing durations on concrete mechanical properties. Unlike most prior research, which typically used fixed steam durations and focused mainly on compressive strength, this work directly compares multiple steam-curing intervals (4–48 h at 66 ± 2 °C) with conventional water curing (3–28 days), enabling clear one-to-one comparisons of compressive, splitting tensile, and flexural strength development. Four mixtures were tested: control mixes at w/c 0.6 and 0.35 (no silica fume), plus mixes with silica fume added at 10
. This work investigates a fractional boundary value problem in the sense of Riemann-Liouville derivative and integral. We derive some novel results for the necessary and sufficient conditions for the existence and uniqueness of the positive solution. In this regard, some fixed-point theorems on cones are used. Also, a convergent successive sequence to find the solution to the problem is introduced. We derive the numerical scheme for the proposed problems. The correctness of the proposed results is verified with some illustrative examples.
Synthesis of tetrazolo[1,5-a]pyridine derivatives using task-specific silica immobilized organosilane-based azide ionic liquid via the convenient multicomponent reaction is described. Treatment of di-(methyl and ethyl) acethylenedicarboxilate with arylaldehydes, malononitrile, and sodium azide at 80 °C in the absence of any catalyst afforded to the expected products. Tetrazolo[1,5-a]pyridines were efficiently prepared in good to excellent yields under very simple and mild conditions. The significant advantages of this strategy include creating two C–N, two C–C bond and a N-N bond in one-pot procedure, operational simplicity, solvent and catalyst-free conditions. Simple handling of the azide containing nanoparticles and thus lowering the risks and hazards of a chemical process can offer other important advantages.
