Physical Sciences and Engineering

Rapid expansion of antimicrobial-resistant pathogens has intensified the demand for chemotypes that are both potent and environmentally sustainable. We describe a green one-pot strategy for constructing a small library of polyhydroquinoline derivatives (4a–4e) starting from 5-methyl-2-aminopyridine and aromatic aldehydes in ethanol under catalytic HCl. Antimicrobial activity was assessed by agar well diffusion against Staphylococcus aureus, Bacillus anthracis, Pseudomonas aeruginosa, Escherichia coli, Candida albicans and Aspergillus niger.

The ground support for the Ban Houayxai exploration decline project has been thoughtfully designed, leveraging a wealth of research alongside detailed geological and geotechnical mapping of the underground conditions. While the drilled holes presented some unexpected results in the decline area, our dedicated team has made remarkable strides in collecting valuable data through meticulous underground geotechnical mapping.

The electrical characterization of solar cells is essential to evaluate their performance and understand their behavior under different environmental conditions, including temperature. Charge carriers, under the influence of temperature, diffuse into the cell, a phenomenon quantified by the diffusion capacitance. These generated carriers do not contribute to the electric current; some recombine in specific areas, either on the surface or in the bulk. Bulk recombination mechanisms include Shockley-Read-Hall (SRH) recombination, radiative recombination, and Auger recombination.

The rapid industrialization and urbanization of the Uruan Local Government Area of Akwa Ibom State, Nigeria, have significantly contributed to heavy metal contamination in the Nwaniba River. This research assesses the ecological risks associated with contamination using advanced machine learning techniques. Water, sediment, and marine organism samples were analyzed using ICP-OES to quantify seven heavy metals: iron (Fe), copper (Cu), nickel (Ni), lead (Pb), zinc (Zn), chromium (Cr), and manganese (Mn).

This study applied t-distribution statistical analysis to evaluate the quality of electrical cables produced in Lagos metropolitan city, Nigeria, with a focus on the standard conductor resistance and sample resistance. The aim of this work is to determine the conformity of thecables produced in Lagos to established standards and identify areas for improvement in the production process. The population mean and standard deviation of the sample data were estimated.

Shakuntala Devi gained worldwide recognition for being the most prominent human computer globally, showcasing unparalleled skills in the field of computer science and technology. Her remarkable contributions to this domain have solidified her reputation as a pioneer in the field. Due to her extraordinary abilities and prowess, she is widely revered as the "Human Computer of the World" due to her extraordinary abilities.

In this paper, we examine shape optimization problems for thermoelasticity. We first propose a model of the thermoelasticity problem, and then provide a mathematical analysis for the model under consideration. We also show result for the existence of optimal shapes in three ways, and we conclude by giving a shape derivation result using the Lagrange method.

Gender equality implies that men and women have equal opportunities in education, career growth, financial independence and political empowerment. Guaranteeing rights of women and providing avenues is critical for attaining equity. Major problems faced by them are security, motherhood, family responsibility and self-imposed gender subordination. Women have fewer opportunities for economic participation than men, less access to basic and higher education, greater health and safety risks, less visibility at the higher positions and less political representation/leadership.

L’objectif de notre étude a été de mettre en relief l’efficacité du phénomène d’adsorption en utilisant comme matériau adsorbant l’argile pour éliminer les eaux contaminées par la Lévofloxacine. Des billes d’argile environ 0,3 cm de diamètres ont été fabriquées et activées thermiquement. Diverses matrices telles que l'eau ultra pure et l'eau de rivière contaminée par la Lévofloxacine à des concentrations différentes ont été prises en compte. Deux expériences ont été réalisées à savoir, l’adsorption par hydrolyse et l’adsorption par l’argile.

It Synthesis of 2-phenyl benzimidazole derivatives by oxidative condensation reaction with o-phenylenediamine (1.05 mmol), substituted benzaldehyde (1 mmol), catalyst cobalt (II) acetylacetoneand solvent CH3OH stirring at room temperature for 4 hours. Solubility experiments showed that the cobalt (II) acetylacetone is miscible with methanol and relatively readily soluble in polar solvents such as ethanol, and they are partially immiscible with no-polar solvents such as ethyl acetate, and tetrahydrofuran. The efficiency of the reaction was mainly affected by the amount of the catalyst.