In the present paper, we propose an efficient iterative numerical method of successive approximations to approximate solution of nonlinear Urisohn-Volterra fuzzy functional integral equations by fuzzy trapezoidal quadrature formula for classes of fuzzy-number-valued functions of Lipschitz type. We prove the convergence of the method and investigate the numerical stability of the present method with respect to the choice of the first iteration. The convergence of the method is tested through a numerical experiment, that confirms the obtained theoretical results.

The widespread application of plain S235JR steel across various industries often involves its exposure to degradative conditions, such as the organic acid concentrations typically found in various foodstuffs. This study investigates the corrosion behavior of S235JR steel immersed in several common beverages. The corrosion of steel S235JR was evaluated by gravimetric and electrochemical study. Statistical modeling via multiple linear regression and ANOVA was utilized to verify the experimental dataset. Based on the results, the highest early-stage corrosion occurs in coffee and tomato juice, though apple cider vinegar stands out for its steadily intensifying corrosive effect over the immersion period. Conversely, the presence of citric acid in lemon and orange juices appears to act as an inhibitor, leading to the lowest observed corrosion rates. The strong correlation between electrochemical parameters ($I_{corr}$ and $E_{ocp}$) and physical mass loss confirms that the chemical nature of each beverage significantly governs the corrosion kinetics of S235JR.

Purpose: Human skeleton exhibits varying degrees of sexual dimorphism – the pelvic bones, limbs long bones and the skull are the most frequently studied. Methods have been developed for the study of individual bones, and a high degree of sexual dimorphism is observed in measurements of the skull and, more specifically, of the facial skull in humans. Data on sexual dimorphism for the Bulgarian population are from direct measurements of skulls performed with conventional craniometric instruments. The aim of the study was to evaluate the sexual dimorphism of piriform aperture and facial skull dimensions obtained on 3D reconstructed MSCT scans in individuals of the South Bulgarian population. Methods: The study included three-dimensional skull models rendered from computed tomography head scans with landmarks acquired on them. Results: The results revealed that the mean values of all linear measurements of the piriform aperture and facial skull showed the presence of significant sexual dimorphism. Conclusions: With the development of imaging diagnostics, conditions have been created for performing more precise craniometric studies of people. Therefore, this gives the opportunity to update and supplement the available database for the Bulgarian population. It provides essential information for facial reconstruction, preoperative examination, surgical procedures and postoperative controls.

The paper presents the results from a study of the possibility to use Bilberries anthocyanins as a corrosion inhibitor for aluminum alloy EN AW-2024 in 1 М solution of HCl. In this study the model system between Bilberries anthocyanins and metal was investigated. The inhibitory effect of Bilberries anthocyanins on the corrosion of aluminum alloy EN AW-2024 in 1M HCl was investigated by electrochemical methods and mathematical analysis to validate the results. The absorption was determined from 25 oC. The results show that Bilberries anthocyanins exhibits a good inhibitory effect on the corrosion of the aluminium alloy EN AW-2024 in 1M HCl. The reason for the good inhibitory effect is the adsorption of the inhibitor molecules on the surface of the aluminum alloy.

This article presents an experimental study aimed at determining the optimal printing temperatures for the nozzle and the build plate when printing ABS by evaluating the geometric accuracy of the parts. The recommended printing temperatures were analyzed, and various operating temperature regimes were selected for the nozzle and the build plate. The experimental part is based on single-factor and two-factor experiments. An analysis of the manufacturing process was also performed. Despite the experimental determination of the optimal temperatures, the manufactured parts do not meet the specified tolerances. Further research is needed to determine the shrinkage coefficient and to make corrections to the initial model.