bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sealing effect on corrosion resistance of boric sulfuric acid anodizing on AA2024
Authors: Zuchry Muhammad , Renreng Ilyas , Arsyad Hairul , Arma Lukmanul Hakim , Widyianto Agus 
Published: May 2023

Aluminum is widely used due to its excellent properties, lightweight and thermal conductivity. However, when used in aircraft applications, it can cause corrosion and sticking, compromising safety. To address this issue, anodizing is used to improve aluminum's corrosion resistance and adhesion. In this study, the AA2024 material was anodized using the boron-sulfuric acid anodization (BSAA) process, followed by a sealing process using acetic acid. This sealing process forms an oxide layer on the aluminum's surface, which reduces the corrosion rate. The study investigated the effects of anodization voltage and time on the results of BSAA anodization through quantitative and qualitative measurements, including corrosion resistance, potentiodynamic polarization, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The results showed that samples anodized with a gasket could reduce the corrosion rate by up to 85 % compared to those without a gasket and substrate. The most significant reduction in corrosion rates occurred at an anodization voltage of 10 V and an anodization time of 15 min. The potentiodynamic test results indicated that the Tafel plot during sealing lies in the cathodic region where the corrosion current density decreases with increasing voltage. SEM observations revealed that the anodizing process could provide an oxide layer on the samples' surface, while the sealing process creates a smooth surface. EDS analysis showed that an oxide compound was formed in an oxide bond state after the sample surface was subjected to the sealing treatment. Overall, the study demonstrates the effectiveness of BSAA anodization in improving corrosion resistance and highlights the importance of considering the anodization parameters
Biopharmaceutical justification of the creation of self-emulsifying drug delivery systems with simvastatin
Authors: Bodnar Liubov , Polovko Nataliia , Bevz Nataliia , Hrudko Volodymyr , Perepelytsia Olesia 
Published: May 2023

The aim of the research – to conduct biopharmaceutical tests of capsules with a self-emulsifying delivery system of simvastatin to confirm the effectiveness and feasibility of introducing into the composition of self-emulsifying drug delivery systems active pharmaceutical ingredients that are difficult to dissolve in the gastric juice environment.
Material and methods. Substances, excipients, reagents and materials used during research were simvastatin (India, p. DK40-2005021, 99.09 %), castor oil (Ukraine), polyethylene glycol 40 hydrogenated castor oil (India), Tween 80 (Ukraine), glycerol monostearate (Gustav Heess GmbH, Germany), polyethylene glycol 100 stearate (ERCA, Italy), hard gelatin capsules No. 3 white (China), 0.1 M hydrochloric acid solution (made from concentrated hydrochloric acid), ethanol 96 % (Ukraine), filter paper 90 mm white tape (Ukraine). The reference drug is "Simvastatin-Sandoz" (Salyutas Pharma, Germany, series LX5161).
An Evolution 60S spectrophotometer (USA) was used to carry out studies by absorption spectrophotometry.
Results. Preliminary study of the absorption spectra of absorption of the substance, bases, gelatin capsules, developed self-emulsifying systems and the reference drug made it possible to predict and optimize the conduct of biopharmaceutical research. The study of the release of simvastatin from the developed delivery systems and the reference drug, which was carried out at a temperature of 37 ℃ in an environment of 0.1M hydrochloric acid, showed that the introduction of simvastatin into the composition of the investigated self-emulsifying compositions allows to increase its solubility in this solvent by five times, compared to the reference drug.
Conclusions. The obtained results indicate the effectiveness of the introduction of simvastatin into the composition of self-emulsifying drug delivery systems and the feasibility of using such systems to improve the solubility and accelerate the release of a poorly water-soluble active pharmaceutical ingredient into the gastric juice environment
Model development according to increase in the active resistance of the conductor to ac current at the surface effect
Authors: Prokuda V.M. , Rukhlova N.YU 
Published: May 2023

Purpose. When alternating current with higher harmonics passes through the cable, heating is carried out by the root mean square value of all harmonics. Taking into account the different resistance of the cable depending on the frequency due to the effect of the surface effect, it is advisable to calculate the coefficient of increase in the total current resistance, assuming the action of each harmonic as independent. However, there are prerequisites to consider existing calculation models difficult for algorithmic implementation in software packages. Therefore, the purpose of the work is to develop a calculation model to take into account the increase in the active resistance of the conductor to alternating current due to the surface effect for further use in simulation modeling packages such as, for example, MATLAB.
Methodology. Methods of linear algebra, linear regression, defining the coefficient of determination.
Findings. Dependencies for determining the resistance value of high-voltage cable lines to high-frequency currents, which take into account the cross-section and harmonic composition of the current, have been obtained. According to the existing and substantiated graphs (dependencies) obtained on the basis of classical expressions from the literature, new simplified calculation dependencies were obtained (for the cross-section of copper cable lines 240 - 1000 mm2) when current harmonics above the fifth at a base frequency of 50 Hz. Such calculated ratios will allow taking into account several harmonic components of the current during line heating in the MATLAB Simulink software environment.
The obtained values of the coefficient of determination in defining the calculated dependencies are close to 1, which indicates the correctly selected type of equation and the correctly selected coefficient k for different cross-sections of the cable line.
Originality. The scientific novelty lies in the development of a new dependence, justified by the high value of the multiple correlation coefficient, the correction factor for the increase in the resistance of the cable core from the harmonic number and the empirical coefficient of the regression model, taking into account the cross section of the cable line.
Practical value. The practical value of the work consists in obtaining dependencies that can be used in analytical and simulation models when determining the amount of heating of cable lines taking into account the current of harmonics above the fifth at a base frequency of 50 Hz. Such an application will allow in many cases to replace the physical experiment with a simulation in the MATLAB Simulink software environment, which will reduce the necessary human and material costs.
The system for electric vehicle slippage prevention based on a fuzzy logic controller
Authors: Vorobiov Bohdan , Senchenko Serhii , Pshenychnykov Dmytro , Likhno Yaroslav , Khan Liu 
Published: May 2023

Purpose. Development of a functional diagram of a slip prevention system, build a mathematical model, synthesize a fuzzy regulator, simulate and confirm the system's performance.
Methodology. Mathematical analysis and modeling.
Findings. The structure is substantiated and the linguistic variables of the fuzzy regulator are determined. The choice of the number of terms of the input and output variables of the fuzzy controller is made, proceeding from the minimization of the number of logical processing rules. The terms of the linguistic variables of the fuzzy controller are selected in the form of the simplest triangular for the mean values of the range of their definition and trapezoidal for the limit values. Logical processing rules were developed. The choice of the fuzzy inference algorithm was made and the defuzzification parameters were determined. A computer model of the slip prevention system was built using the Fuzzy logic toolbox of the MATLAB package and was framed using 9 logic processing rules. Computer simulation of the acceleration of an electric vehicle with subsequent slipping by one and two wheels has been carried out. The system maintains the inconsistency of wheel speeds with the electric vehicle speed at a constant set level of 1.5s-1 - in accordance with the formulated identification algorithm and completely prevents excessive slipping.
Originality. The built-in phase regulator ensures minimization of the discrepancy between the speed of the wheel rotation and the linear speed of the electric vehicle, which in turn minimizes slippage and provides the maximum possible torque relative to the moment of installation.
Practical value. Computer simulation was carried out for two modes: acceleration with a collision with a surface with a reduced coefficient of adhesion (0.1) with one wheel and acceleration with a collision with a surface with a reduced coefficient of adhesion (0.1) with two wheels. The system completely prevents excessive slipping.
The study of the radiating module of the energy management system of buildings
Authors: Magro V.I. , Plaksin S.V. 
Published: May 2023

Purpose. Improving the toolkit of interaction between sensors and the building control system using a triangular microstrip antenna.
Methodology. Mathematical modeling by the method of finite differences in the time domain.
Findings. The proposed technical solution consists in choosing the optimal design of the radiating module in the form of a triangular microstrip antenna, by means of mathematical modeling, the values of the geometric dimensions of the triangle, the thickness of the dielectric layer and the value of its dielectric constant, the overall dimensions of the radiating module, which ensure optimal coordination of the antenna with the power feeder in the form of a microstrip line. The developed computer model of the triangular microstrip antenna using the finite-difference method in the time domain allows conducting research on the parameters of this antenna that provide stable wireless communication between the system of sensors and the home automation control unit. The condition for increasing the degree of matching the impedance of the antenna and the supply line is the choice of the method of powering the antenna. It was established that the most optimal way of feeding a triangular antenna is the method of connecting the microstrip line to the middle of the side of the triangle, compared to the way of connecting the power line to the top of the triangle. The width of the microstrip power line was optimized according to the criterion of minimizing the module of the reflection coefficient at the antenna input. A study of the degree of matching the impedance of the antenna at operating frequencies of 2,4 and 7 GHz was carried out. At a frequency of 7 GHz, the magnitude of the reflection coefficient module is -23,6776 dB. The three-dimensional and two-dimensional radiation patterns of this antenna are calculated. The radiation pattern has an almost spherical shape, that is, it allows placing the radiating module in any orientation relative to the earth's surface. This allows the triangular microstrip antenna to be used as a radiating module of the building energy management system and the smart home system.
Originality. The study of the ways of feeding the triangular microstrip antenna allows to find the optimal coupling of the antenna with the power line, which ensures the formation of radiation characteristics that ensure effective interaction between the sensors and the building's energy management control system.
Practical value. The radiation characteristics of a triangular microstrip antenna obtained as a result of the study make it possible to use it to organize a wireless communication channel in a 4% operating frequency band.
The Process of Melt Homogenization in a Metered-Discharge Disk Extruder
Authors: Novodvorskyi V. V , Shved N. P 
Published: May 2023

Purpose. This paper aims to develop a physical model of the homogenization process in a metered-discharge disk extruder, as well as to select and justify the variable parameters that can be used to evaluate the efficiency of mixing and process control. Methodology. With the advent of a large number of alloying additives, filled and composite materials, there is a need for continuous monitoring and control of the melt homogenization process. In classical worm extruders, the processes of feeding, melting, homogenization, and pressure generation are interconnected and are triggered simultaneously by a single working body, the worm, which makes it impossible to control each process separately to optimize them. In such cases, cascade extrusion schemes are used, where the process is divided into separate subprocesses or groups of them with the ability to control them independently. Findings. The scheme of a cascade disk-gear extruder is described, where a metered-powered disk extruder is used as a melt-homogenizer, and a gear pump is used to create pressure and dosing. The variable parameters of the disk extruder for adjusting the mixing efficiency are selected and substantiated. The speed components and their ratios for different parts of the homogenization zone are analyzed. The expediency of using a disk extruder as a melt-homogenizer in cascade extrusion schemes is substantiated. The adequacy of using the mixing index in the form of temperature inhomogeneity is emphasized. The homogenization zone in the form of four separate subzones and changes in the accumulated shear strain along each subzone, as well as the possibility of their regulation, are described. Originality. For the first time, a hydrodynamic model of processes in the homogenization zone of a metered-discharge disk extruder was developed and described. Practical value. The possibility of adjusting the velocity field in the homogenization zone of a disk extruder has been substantiated, which allows controlling the mixing effect directly during the extrusion process. The possibility of selecting the optimal mode of operation of the homogenization zone makes it possible to obtain a melt of a given quality with minimal energy consumption.
Impacto de las políticas de restricción de publicidad, promoción y patrocinio de bebidas azucaradas. Revisión Sistemática
Authors: Guarnieri Leila , Perelli Lucas , Clausen Marcos , Guaresti Germán , Espinola Natalia , Graciano Andrea , Alcaraz Andrea 
Published: May 2023

Objetivo. Evaluar el impacto de la implementación de la prohibición de la publicidad, promoción y patrocinio (PPP) de las bebidas azucaradas (BA) en términos de disminución de consumo, exposición publicitaria y desenlaces clínicos relevantes.
Material y métodos. Revisión sistemática de estudios publicados entre 2001-2021 en bases de datos PubMed, Embase y LILACS escritos en inglés, portugués o español. Se incluyeron estudios experimentales, observacionales y modelos económicos.
Resultados. Se seleccionaron 16 de 840 estudios identificados. Debido a la heterogeneidad en los desenlaces no fue posible realizar un meta-análisis. Las intervenciones incluidas correspondieron a una política integral, medidas generales de restricción de PPP de BA, restricciones de publicidad televisiva, de promociones, en punto de venta y en escuelas. Se hallaron desenlaces clínicos (obesidad, enfermedad cardiovascular, diabetes, cáncer), económicos (compra, venta, costo-efectividad, otros desenlaces económicos), cambios en la exposición, en el consumo y en otras medidas de efectividad. La mayoría de las medidas de efecto evaluadas registraron disminuciones a partir de las intervenciones.
Conclusiones. Las políticas que incluyen una restricción de la PPP de las BA resultarían efectivas, sobre todo para disminuir su consumo en NNyA, impactando positivamente en su salud.
Voice quality in Polish children with vocal fold nodules
Authors: Szkiełkowska Agata , Krasnodębska Paulina , Myszel Karol 
Published: May 2023

BackgroundVocal fold nodules are a common cause of pediatric dysphonia. The aim of the study was to assess the acoustic structure of the voice in children with vocal fold nodules and investigate the relationship between objective and subjective measures.Material and methodsThe study group consisted of 223 children, aged 7 to 12 years with normal hearing. The control group included 213 children. All children underwent ENT and phoniatric examination including laryngovideostroboscopy (LVS), assessment of voice on the GRBAS perceptual scale, and acoustic analysis (spectrographic analysis using the Multi-Dimensional Voice Profile).ResultsIn children with vocal fold nodules the average perceptual score for their voice was G1R1B0A0S2. No statistically significant effect of the child’s sex or age on the values of the MDVP parameters was found. The acoustic structure of the voice of children with childhood
dysphonia and vocal fold nodules differed significantly from the acoustic structure of those in the control group. A relationship between GRBAS features and MDVP analysis was found.ConclusionsVoice acoustic analysis is a valuable tool for assessing voice quality in children. The analysis can identify deviations from normal values that the human ear is unable to pick up.
Mito, legitimación y memoria social a través de la imagen: la escultura prehispánica de una cabeza de serpiente en Tehuacán, Puebla
Authors: Domínguez Núñez Martín Cuitzeo 
Published: May 2023

Este artículo describe y analiza la escultura de una cabeza de una serpiente hallada en el Templo Mayor de Tehuacán, en Puebla (México) durante el año 2014. La escultura pertenece al período posclásico tardío que va del año 1200 a 1521. Por medio de un método que combina el análisis iconográfico de Panofsky y la semiótica visual de corte estructuralista, se llevó acabo el análisis de la imagen de la escultura. Para interpretar los resultados se empleó tanto el contexto arqueológico de la escultura como fuentes primarias de la época de la conquista. Por medio de estos elementos se realizó una lectura mitológico-política acerca del significado y papel dentro de la cosmovisión mesoamericana de la escultura. Entre los resultados hallados se encuentran el empleo de estrategias visuales como la repetición, la simetría, la oposición, el ritmo y el movimiento. Se encontró también que la escultura se relaciona con una serie de mitos acerca del dios Técpatl o cuchillo de los sacrificios, con la diosa Cihuacoatl y con un proceso de legitimación política por parte de la élite de Tehuacán. Posteriormente se interpretó la relación de la escultura y sus estrategias visuales con la memoria social, la producción de nuevas significaciones, las tecnologías de la remembranza y los sistemas de memoria. El artículo concluye con una reflexión acerca de la relación entre la escultura y la memoria social a partir de una cita de Fray Bernardino de Sahagún y a partir de una reflexión acerca de la relación entre imagen y memoria en los códices prehispánicos
Apuntes etnográficos acerca de la investigación antropológica en el diseño de servicios
Authors: Aguirre Cortés Anderson , Muñetones Rico Mateo 
Published: May 2023

La intersubjetividad ligada al paradigma de la posmodernidad ha generado intersticios en los que se han abierto nichos para la interdisciplinariedad de las ciencias sociales. Este artículo, que se perfila como revisión de tema, aborda esta cuestión desde la relación que existe en la actualidad entre la antropología y el diseño de servicios, a través de la implementación de metodologías provenientes de las ciencias sociales como herramientas para el sustento creativo; principalmente el uso de la etnografía aplicada a la investigación para el diseño, y su relevancia dentro de la constitución del espectro de la experiencia de usuario.
Evolution of precancerous changes in the gastric mucosa. A case report
Authors: Tryapitsin Alexander V. , Malkov Vladimir A. , Gasanov Emil M. , Belyakov Ilya A. 
Published: May 2023

To present the experience of long-term observation of a patient with atrophic and dysplastic measurements of the gastric mucosa, to try to analyze the correctness of treatment, dynamic observation.
The analysis included the period from 2008 to 2022. 19 esophagogastroduodenoscopies were performed. A histological study was conducted according to the Operative Link for Gastritis Assessment. Neoplastic changes were evaluated according to the World Health Organization classification of gastrointestinal tumors of 2019. The evolution of changes was observed under conditions of limited possibility of eradication of Helicobacter pylori due to intolerance to antibacterial drugs.
During 14 years of follow-up, the endoscopic picture did not demonstrate significant changes. In each study, atrophy of the gastric mucosa was noted; in most cases no intestinal metaplasia and hyperplasia, erosion, ulcers, and neoplasms of the examined segments were detected. According to the histology, atrophy, intestinal metaplasia and hyperplastic changes in the gastric mucosa, Helicobacter pylori were constantly present from 2008 to 2013. Unsuccessful attempts of eradication were made. In 2013 low-grade intraepithelial neoplasia was detected, and in 2014 local high-grade intraepithelial neoplasia. Due to the small-scale nature of the changes, the observation tactics were continued. In 2015, against the background of persistent intraepithelial neoplasia of an indeterminate nature, an attempt was made to eradicate Helicobacter pylori. In 2016, a regression of neoplastic changes to low-grade intraepithelial neoplasia was recorded. From 2016 to 2022, there was a stabilization of inflammatory and atrophic changes. Intraepiteal neoplasia of the gastric mucosa and Helicobacter pylori did not recur.
The observation is notable for the fact that for 7 years it was impossible to carry out Helicobacter pylori eradication therapy. There was no negative dynamics for 5 years. In the period from 2013 to 2015, high-grade intraepithelial neoplasia of gastric mucosa was formed. The situation changed with the introduction of antibacterial therapy, after which neoplastic changes regressed and a stable picture was observed over the next 6 years. Despite the observations of various specialists, the availability of objective and reliable information, and the decisions made on its basis allowed to prevent the development of stomach cancer.