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Temperature responsive aluminum manganese doped carbon dot sensors for enhanced electrical conductivity with DFT calculations
Abstract Agricultural wastes provide abundant cellulosic by-products, making them excellent candidates for sustainable material production. In this study, sugarcane bagasse was used to synthesize aluminum/manganese-doped carbon quantum dots (Al-Mn/CQDs) through a microwave-assisted process. Aluminum doping and subsequent thermal treatment progressively reduced the band gap of manganese-doped carbon quantum dots from 1.21 eV to 0.7 eV and 0.3 eV, respectively, demonstrating a tunable electronic structure with implications for applications requiring specific emission wavelengths. The resulting CQDs exhibit a spherical morphology (1.95–2.05 nm) and, upon aluminum incorporation, form uniform sheet-like structures decorated with these particles. Optical analysis shows a notable improvement in fluorescence quantum yield, reaching up to 42.65% at elevated synthesis temperatures, and a narrow full width at half maximum, demonstrating strong potential for bioimaging and sensing applications. Aluminum incorporation into Mn/CQDs lowers the LUMO energy level from − 0.12459 to − 0.14838 eV, indicating that aluminum creates or modifies acceptor states to favor electron acceptance. Moreover, the total energy decreases from − 1638.16 au in Mn/CQDs to − 1874.34 au in Al-Mn/CQDs, underscoring the enhanced stability and favorable formation of the aluminum-modified carbon dots. Density functional theory (DFT) calculations reveal a lower energy gap (0.0482 eV), higher softness (20.74 eV), and enhanced charge transfer, findings confirmed by stable and low-impedance conductivity across a wide frequency range. These properties make Al-Mn/CQDs ideal for antistatic protection, electromagnetic interference shielding, and RLC bridge calibration, while their temperature-sensitive behavior also shows promise for temperature sensing applications.
Research on shale TOC prediction method based on improved BP neural network
Correlation between ADGRV1 expression and clinical pathological and prognostic features in breast cancer
Structural basis of lipid transfer by a bridge-like lipid-transfer protein
Transcultural Zen design frameworks for enhancing mental health through restorative spaces and user experience
An empirical investigation of environmental impacts of agglomeration economies in major cities of Pakistan
Management outcomes and clinical features of combined exfoliation syndrome with angle closure glaucoma
Abstract This study investigated the distinctive features and management outcomes of combined exfoliation syndrome and angle-closure glaucoma (XFS-PACG) through a prospective, multicenter observational cohort study including 350 patients (118 XFS, 127 PACG, 105 combined XFS-PACG). Combined pathology demonstrated unique characteristics including bimodal diurnal IOP fluctuations, asymmetric angle closure correlating with exfoliation material distribution, and accelerated zonular weakness with progressive anterior lens displacement. Disease progression was significantly more aggressive in combined cases (visual field deterioration − 2.9 ± 0.8 dB/year versus − 1.7 ± 0.6 and − 1.4 ± 0.5 dB/year in XFS and PACG respectively). Therapeutic response evaluation revealed that prostaglandin-alpha2agonist combinations were most effective pharmacologically in combined cases, while traditional laser peripheral iridotomy achieved limited sustained control (38.1%). Early phacoemulsification with minimally invasive glaucoma surgery demonstrated superior surgical outcomes (72.4% complete success) compared to filtering procedures (53.3%). These findings support an individualized treatment approach for combined XFS-PACG, with early intervention and condition-specific protocols to optimize outcomes in this challenging clinical entity.
Gold exploration in the Gabal Abu Karahish area, Central Eastern Desert, Egypt: an integrated geological perspective
Abstract This study aims to explore the presence and distribution of gold deposits in the Gabal Abu Karahish area by identifying hydrothermal alteration zones associated with favorable geological settings. The objective is to assess gold potential through an integrated remote sensing and geochemical approach. Multispectral satellite data from ASTER and Landsat-9, combined with radiometric data and field geology, were utilized to delineate alteration zones indicative of mineralization. ASTER band ratios (7/6, 4/6, and 9/8) and Landsat-9 false color composites were processed to enhance lithological discrimination and detect hydrothermal alterations. Automated lineament extraction was also performed to evaluate structural controls on mineralization. Several alteration zones of argillic, phyllic, and propylitic types were identified and are spatially associated with alteration minerals such as chlorite, calcite, kaolinite, sericite, and iron oxides. Scanning electron microscopy (SEM) analysis of ten representative samples from alteration zones and quartz veins in metavolcanic and ultramafic rocks confirmed the presence of gold in all samples, with concentrations ranging from 0.23 to 0.83 g per 50 g of rock powder. These findings highlight key zones for further gold exploration. Geologically, the area is composed of calc-alkaline metavolcanic rocks, Dokhan volcanic rocks, serpentinites, talc carbonates, hornblende gabbros, tonalite, granodiorite, and younger granite intrusions. The lithological diversity and structural features, including listwanite ridges and overthrust contacts, further support the area’s mineral potential.
Green synthesis of hematite nano flakes and their application as a counter electrode in dye-sensitized solar cells
Novel endophytic actinomycetes species Streptomyces panacea of Panax sokpayensis produce antimicrobial compounds against multidrug resistant Staphylococcus aureus
Magnetization treatment effect on some physical and biological characteristics of saline irrigation water
Abstract Salinity in irrigation water and soil poses a major challenge to the expansion of agricultural land in Egypt. High salt concentrations can lead to significant issues for both soil health and plant growth. Additionally, understanding water hydraulics in pressurized irrigation systems is crucial for their effective design, management, and operation. Magnetic water treatment has emerged as a potential solution to mitigate these salinity-related problems. This study was conducted to examine the effect of magnetic fields on the properties of irrigation water. Magnetic devices with two field intensities (1600 and 14,500 Gauss) were used to treat water at three salinity levels: tap water (219 ppm), 1000, and 2000 ppm. Magnetization was found to influence several physical and chemical properties of water, including velocity, dynamic viscosity, dissolved oxygen, surface tension, and pH. It also had a beneficial effect in reducing the total number of microorganisms. In contrast, electrical conductivity was not affected by magnetization. Variations in water velocity were influenced by both the strength of the magnetic field and the time elapsed after magnetization. Under magnetic treatment, water viscosity decreased, and surface tension dropped by 1.5 and 3% as salinity increased from 219 to 1000 and 2000 ppm, respectively. Additionally, the total number of microorganisms was reduced by 17.1 and 57.3% at 219 ppm, by 38.6 and 57.5% at 1000 ppm, and by 32.5 and 55.5% at 2000 ppm, under magnetic field intensities of 1600 and 14,500 G, respectively, when compared to non-magnetized water.