bluuebunny/crossref_metadata_2025 huggingface dataset:
State policy regarding tariff formation of freight railway transportation
Authors: Voroniatnikov O.O.
Published: December 2024

The article examines the current issue of state policy regarding freight railway tariff formation in Ukraine, which has a significant impact on the country’s economic development and the competitiveness of domestic industry. The current state of freight railway transportation in Ukraine is characterized by a number of problems, including outdated infrastructure, insufficient funding, and tariff policy issues. In the context of ongoing economic instability, it is crucial to balance the needs of shippers, market requirements, and the interests of the state, which must regulate tariffs in a way that ensures the economic viability and competitiveness of railway transportation.
The administrative and legal framework for tariff formation in the field of freight transportation in Ukraine is based on regulatory legal acts that govern the activities of state bodies and economic entities in the transport sector. Central to these acts is legislation that defines the mechanisms for regulating tariffs and the responsibility for their compliance.
The state’s influence on tariff regulation in the field of freight railway transportation is an important tool for ensuring market stability. State bodies influence the level of tariffs through the development and implementation of strategies and policies that promote the growth of this sector, as well as through the definition and adjustment of tariff formation mechanisms, which allow for the consideration of the country’s economic situation. The establishment of appropriate tariffs ensures not only the profitability of railway transportation but also fair conditions for all market participants. Furthermore, effective state policy in this area allows for attracting investment in infrastructure and improving the competitiveness of Ukrainian goods on international markets.
Thus, the issue of state policy in the field of freight railway tariff formation is extremely important for the sustainable development of the transport sector and the country’s economy as a whole. The article provides an analysis of the current state of this sector, explores the main problems and trends, and assesses the role of the state in optimizing tariff policy and its impact on the effectiveness of freight transportation in Ukraine.
Assessment of in vitro alpha-glucosidase inhibitory activity, phenolics, flavonoidsand antioxidant potential of jamun (Syzygium cumini) seeds
Authors: M Arivalagan , DR Priyanka , A Rekha , PC Tripathi
Published: December 2024

Jamun (Syzygium cumini Linn. Syn. Eugenia jambolana) genotypes collected from different parts of the country were evaluated for in vitro alpha-glucosidase inhibitory activity, polyphenolic content and antioxidant potential along with fruit characters. Results indicated significant variation among genotypes for fruit characters, phenolics, flavonoids, antioxidant potential, and alpha-glucosidase inhibitory potential. Total phenolics and flavonoids in seeds varied between 15.5 mg to 98.7 mg GAE/g and 0.79 mg to 9.03 mg CE/g seeds, respectively. The seeds with a high content of polyphenolic compounds required a very less amount of sample to inhibit alpha-glucosidase enzyme. The genotype Selection 45 recorded the highest alpha-glucosidase inhibitory activity, and required only 50.3 µg of sample to inhibit 50 % of the enzyme activity. Both phenolics and flavonoids content positively correlated with antioxidant potential and negatively correlated with enzyme inhibitory potential. From cluster analysis, the genotypes AJG-85, Kaithanal, Selection-45, Collection-2, and Konkan Bahdoli were identified as superior genotypes having a considerable amount of seeds with alpha glucosidase inhibitory compounds. These genotypes/collections may be effectively utilized for further studies to isolate and characterize the bioactive constituents with alpha-glucosidase inhibitory potential.
“Felicidades hermanas”. Sociabilidad y subjetividad entre seguidoras argentinas de Taylor Swift
Authors: Gonzalez Julieta , Rodriguez Rocío María
Published: December 2024

El presente artículo analiza la construcción del gusto por Taylor Swift mediante el acercamiento etnográfico a las prácticas de sus fans en el contexto argentino.  Para ello, el texto aborda escenarios del mundo swiftie online y offline, que tenían especial relevancia para la producción de sentidos de comunidad y formas de hacer lo social, pero también de interpretar y realizar lo individual. Específicamente, indaga la producción de sentidos presente en trendig topics, memes y trends que circulaban por redes sociales durante la época en la que tuvo lugar el primer paso de la cantante por escenarios argentinos. Ese análisis permite reflexionar sobre los complejos entramados en los que se entretejían los mercados, las músicas y las prácticas aficionadas. Particularmente el caso swiftie, permitió identificar formas de construcción subjetiva y colectiva que ocurrían de manera dialógica entre el mundo online y los espacios offline, territorios donde se disputaban y realizaban performativamente formas de ser y de hacer.
Más allá de la reactividad: la creación de un sujeto policial de proximidad en Córdoba, Argentina
Authors: Caccia Ana Clara
Published: December 2024

En este artículo abordaremos el proceso de creación e implementación de la división de Policía Barrial en la provincia de Córdoba. Este nuevo modelo de policiamiento del espacio urbano se enmarca en el Plan Integral de Seguridad Ciudadana y Prevención del Delito. A partir de un enfoque etnográfico y de la realización de entrevistas en profundidad a agentes de la Barrial, directores de la División y funcionarios del Gobierno Provincial, analizaremos el proceso de construcción de un sujeto policial de proximidad (Sirimarco 2006; Goldin 2020). Las dimensiones que abordaremos se relacionan con el modo de actuación de la barrial en el espacio urbano, las tácticas policiales que los agentes despliegan y las tareas que desarrollan en su cotidianeidad. Además, analizaremos la incorporación de la ciudadanía tanto en el abordaje de la seguridad y del delito como en las tácticas policiales. Y, por último, presentaremos algunas lecturas alrededor de la categoría de riesgo y las estrategias de recolección de la información.
Aproximaciones a los ecosistemas de medios educativos situados
Authors: Bordón Esteban Ismael
Published: December 2024

La incorporación de tecnologías en el ámbito educativo ha sido uno de los aspectos más relevantes de las últimas décadas. Sin embargo, la adopción de tecnologías por parte del sistema educativo formal ha estado continuamente en procesos de tensión y resistencia, por lo que se presenta un desfase sostenido entre los usos tecnológicos dentro de las aulas y los usos que se dan en el ámbito social. Este artículo indaga en la integración de la tecnología en el nivel universitario, en contextos socioculturales diferenciados, a través de un estudio comparativo. Se implementa un enfoque etnográfico, basado en la observación directa de clases del primer curso de las carreras de Licenciatura en Ciencias de la Comunicación (UNSa, Argentina) y del Grado en Periodismo (UNIZAR, España). Para contextualizar la investigación, además, se incorpora un análisis documental de los planes de estudio. Como resultados se logra caracterizar la configuración de ecosistemas mediáticos situados, identificando y enumerando los elementos que lo componen. Se concluye que, aunque un bajo nivel de acceso limita ciertos usos tecnológicos, un mayor acceso material no asegura una mejor experiencia educativa, sino que presenta nuevos desafíos por lo que es necesaria una revisión constante de las prácticas educativas mediatizadas.
La comunicación de la ciencia: un estudio de su estado en la UNLP. -Argentina.
Authors: Tripiana Leon
Published: December 2024

Este trabajo se propone conocer y analizar de qué manera se desarrolla la comunicación científica en el marco de la Universidad Nacional de La Plata (UNLP), entendiendo la importancia que tiene la misma en los procesos de democratización social del conocimiento, y en la revalorización de la ciencia nacional. El objetivo es indagar las principales dimensiones de la comunicación de la ciencia, en el contexto más amplio de las relaciones ciencia, tecnología y sociedad; ubicando estas relaciones en un contexto histórico concreto.
Sobre la base de este trabajo en curso se realiza esta investigación. Encontramos que el contexto social, político, económico y ambiental constantemente plantea nuevos desafíos para el desarrollo científico, tecnológico y cultural en clave con nuestra soberanía nacional. De esta manera, desde una perspectiva multifacética, no excluyente, de la comunicación, se establecen los principales ejes actuales del debate académico. Y se indaga en los fundamentos y estrategias comunicativas en una experiencia concreta: las formas y sentidos por los cuales se desarrolla la comunicación de la ciencia en la UNLP.
Establecemos una caracterización general de la organización institucional, identificando una pluralidad de estrategias de comunicación científica empleada. Para ello hemos utilizado las herramientas metodológicas definidas, centralmente el análisis de documentos institucionales y entrevistas a referentes del área. Avanzar en el conocimiento del objeto propuesto permitirá fortalecer las estrategias institucionales de comunicación de la ciencia y democratización social del conocimiento.
estudiantes universitarios extranjeros en la mira
Authors: Centocchi Claudio
Published: December 2024

Este artículo analiza la construcción que efectuaron portales web de noticias y diarios impresos argentinos de una exposición de la entonces precandidata a presidente y hoy ministra de Seguridad, Patricia Bullrich, respecto al estado de la educación superior y, en especial, al colectivo de estudiantes extranjeros. Un asunto de gran relevancia y actualidad.
Se busca describir cómo inciden en esa construcción, que comprende un discurso de odio, los prejuicios, las rutinas deficientes de algunos profesionales de la información, así como las decisiones editoriales y el contrato de lectura de cada medio.
-Palabras clave: discurso de odio, práctica periodística, migrantes, universidad pública, circulación discursiva.
Las narrativas en el Periodismo de Migraciones.
Authors: Quiñónez Gómez Herly Alejandra
Published: December 2024

Las narrativas en el Periodismo de Migraciones buscan dar diferentes enfoques para el relato de la movilidad humana. Ante el aumento de la migración de los venezolanos, se plantea describir con una investigación cualitativa-documental, cómo es la cobertura propuesta para este fenómeno social a partir del análisis de contenido de guías y manuales periodísticos referidos sobre Colombia y Venezuela. Luego del análisis de las categorías de estudio (aspectos formales; introducción, contexto o presentación; aspectos teóricos; aspectos metodológicos; recomendaciones para la cobertura y narrativa periodística y glosario), los hallazgos consisten en que entre los aspectos teóricos destacan la migración pendular, Derechos Humanos y narrativas creativas. Los textos estudiados hacen referencia a aspectos cronológicos de la migración venezolana hacia Colombia y resaltan los nexos históricos y geográficos. Las recomendaciones generales hacen énfasis en el lenguaje, tratamiento del migrante y procesos migratorios. Se concluye que los documentos analizados enfatizan en fuentes informativas y nuevos formatos empleando elementos multimedia y transmedia.
Tratamiento periodístico de herencia recibida por los reyes de España
Authors: Nuñéz Valdes Juan
Published: December 2024

A pesar de haber sido una pionera de las mujeres españolas licenciadas en Farmacia en España y también la primera de Menorca, lo cual ya le da a su figura un indudable valor, Catalina Llabrés Piris es más conocida por el hecho de que muchos años después de su muerte, su único hijo, Juan Ignacio Balada Llabrés, legó toda su herencia, incluida la farmacia que ella había fundado, a los entonces Príncipes de Asturias, don Felipe y doña Letizia, y a los ocho nietos de los entonces Reyes, don Juan Carlos I y doña Sofía. El objetivo principal de este artículo es mostrar el tratamiento que le ha dado la prensa a este asunto y la metodología seguida ha consistido en una búsqueda exhaustiva de información sobre este asunto en la Hemeroteca Digital de la Biblioteca Nacional de España. Como resultado, se muestra un amplísimo resumen de las informaciones sobre el mismo, que permiten concluir que la información ofrecida se centra más en la descripción de los bienes y en los aspectos legales de esta curiosa herencia que en la opinión personal y el análisis de todos los implicados y allegados, incluidos los propios periodistas que firman esas colaboraciones.
comunicación de científicos en Twitter sobre el COVID-19
Authors: Franco Yanina V. , Andrés Gonzalo D.
Published: December 2024

Este estudio examina cómo cinco científicos argentinos utilizaron Twitter durante la pandemia de COVID-19 para compartir información, interactuar con el público y posicionarse en el debate público. A través del análisis de 177 hilos de tuits publicados en el periodo 2020-2021, se identifican los temas, formatos y estrategias comunicativas predominantes. Los resultados sugieren que la crisis sanitaria impulsó a los científicos a intervenir activamente en la comunicación pública de la ciencia, aunque también reveló que no aprovecharon las potencialidades interactivas y audiovisuales que tiene la red social. Se comparan los hallazgos con estudios similares sobre el rol de expertos como comunicadores públicos en las redes. Finalmente, se concluye que estos científicos se dedicaron especialmente a cuestionar las campañas negacionistas de la pandemia y las críticas a las medidas preventivas impulsadas por los gobiernos.
Historia de la música popular uruguaya
Authors: Pellicer Juan , Fernández Melo Daniel
Published: December 2024

Historia de la Música Popular Uruguaya es una serie documental de investigación emitida por la televisión pública uruguaya que nos guía por hitos musicales, autores y autoras de referencia de la canción popular uruguaya y los contextos sociales, políticos y económicos más significativos que sucedieron entre los años 1960 y 2000. Este artículo sistematiza el proceso de construcción de la serie, centrándose en decisiones conceptuales, metodológicas y estéticas. Asimismo, se presenta el entorno documental generado a partir de la investigación realizada para una serie de televisión, conformado por un archivo público online.
Caracterização anatômica dos órgãos vegetativos e histoquímica das lâminas foliares de Marsypianthes chamaedrys (Vahl) Kuntze
Authors: Carmo Alice Gabriela Gama do , Magalhães Cledson dos Santos , Randau Karina Perrelli
Published: December 2024

Marsypianthes chamaedrys (Vahl) Kuntze, conhecida popularmente como alecrim, alfavaca-de-cheiro, coração-de-frade, dentre outras, é utilizada na medicina popular para inibir edema causado pela peçonha de serpentes, diarreia, estimulante e antiespasmódica. Desse modo, estudo objetivou a caracterização anatômica dos órgãos vegetativos e histoquímica das lâminas foliares de M. chamaedrys. Foram confeccionadas lâminas semipermanentes contendo secções transversais da raiz, do caule, do pecíolo e lâmina foliar e secções paradérmicas da lâmina foliar de M. chamaedrys, e analisadas em microscópio óptico de luz e luz polarizada. Lâminas semipermanentes contendo secções transversais da folha fresca da espécie e diferentes reagentes foram utilizados para o estudo histoquímico. A avaliação microscópica possibilitou a identificação de caracteres anatômicos dos órgãos vegetativos, podendo-se destacar a descrição anatômica da raiz; caule com formato quadrangular e tricomas glandulares presentes também no pecíolo e lâmina foliar; e nervura central com colênquima angular na face adaxial e abaxial e presença de cristais do tipo drusa no mesofilo. Por meio da histoquímica foi evidenciado a presença de alcaloides, amido, compostos lipofílicos, compostos fenólicos, e lignina e cristais de natureza de oxalato de cálcio. O estudo contribui com a padronização farmacobotânica e dados sobre a anatomia e a histoquímica dos órgãos vegetativos de M. chamaedrys.
Philosophical Perception of Civil Society
Authors: AGHABALYAN Diana
Published: December 2024

The article highlights the importance of studying civil society and explores the role of philosophy in shaping it. It discusses different perspectives on the matter, emphasizing how philosophy serves as a theoretical foundation for under-standing civil society while also as a field of study playing a pivotal role in its practical implementation.
Philosophical Ideas of Gregory of Narek Regarding the Continuous Self-Improvement of Man
Authors: MANUKYAN Ashot
Published: December 2024

This report is an attempt to reveal the humanistic concept of human self-improvement developed by the 11th century Armenian philosopher, poet, songwriter, and Christian priest, Saint Grigor Narekatsi, canonized by the Catholic Church. The philosophical ideas of a Christian clergyman with a religious worldview regarding the relationship between the human soul, man and society, and man and God are revealed. In his poem “The Book of Lamentations “, the way of realizing the human dream of reaching divine perfection is discussed from the point of view of religious philosophy. His ecological views on the harmonious relationship between rational living matter, man, and nature deserve special attention. It is widely accepted that the psychoanalytical experience of Grigor Narekatsi enriched the universal word culture. From this point of view, Grigor Narekatsi’s multifaceted spiritual legacy has not yet been studied and needs further research.
Examining the economic and cultural impact of an Asian company’s presence in Hungary
Authors: Jenei Szonja , Szalai Szilvia Módosné , Patibandla Vasantha Lakshmi , Moreno-García Elena , Huff Endre Béla
Published: December 2024

The study examines the economic and social impacts of a Southeast Asian multinational company operating in the northwestern region of Hungary, with a particular focus on the local labor market and community responses. The research aims to explore the company’s location choice motivations, its integration process into the local economy, and its cooperation with the local government and communities. The research provides a comprehensive picture of the company’s impacts by employing qualitative and quantitative methodologies—including management interviews and household surveys. The findings indicate that the company has significantly increased employment, enhanced infrastructure, and promoted cultural diversity. However, challenges related to cultural integration persist. The study offers valuable guidance for policymakers and businesses on leveraging the economic benefits of foreign investments and fostering cultural cooperation. Future research could delve deeper into the long-term socio-economic impacts.
Impact social-media use on purchasing decision-making: An applied study on students of the college of business at Imam Mohammad Ibn Saud University (IMSIU)
Authors: Mohammed Abdul Rahman Mohammed Idris
Published: December 2024

This study investigated the impact of social media on purchasing decision-making using data from a questionnaire survey of 257 randomly sampled students from the College of Business at Imam Muhammad Ibn Saud Islamic University. The study items were selected from the study community through a random sample, where several (257) students were surveyed. To achieve its objectives, the study follows the descriptive analytical approach in addressing its topic. The questionnaire was adopted as a tool for collecting data. The questionnaire collected data on the independent variable social media—and the dimensions of the dependent variables representing the stages of purchasing decision-making: Feeling the need for the advertised goods, collecting information about alternatives, evaluating available options, buying decisions, and post-purchase evaluation of the purchase decision. Then, the data were analyzed based on regression analysis using SPSS and AMOS. The important findings are summarized below: Social media use is directly related to feeling the need for and searching for information on advertised goods. Social communication and the evaluation of alternatives to advertised goods, in addition to the existence of a moral effect and a direct correlation between social media use and making the purchasing decision for advertised goods. Providing honest, sufficient, and accurate information via social media to the buyer can help them make the purchasing decision.
Analysis of Croatian public procurement notes: Green public procurement as a strategic tool to encourage sustainable food production
Authors: Perica Monika
Published: December 2024

It is possible to provide green, ecological, and innovative products and services through green and sustainable public procurement. This study analyzes the opportunity offered to public contracting authorities in the Republic of Croatia (RH) in transformation from existing economy to a sustainable one through the inclusion of small and medium sized (SME) companies and inclusion of selection criteria that promote all three sustainable goals. The study employed a qualitative method and empirical analysis of public procurement procedures for eggs in the period from 2013 to 2021 in RH. The product was procured in many social institutions, hospitals, schools, student canteens and by procuring a sustainable product, added value could be created for the entire community. Data from the Electronic Public Procurement Classifieds of the Republic of Croatia (EOJN RH) and Data from the State and European Union (EU) Statistical Office were used. The research showed that sustainable procurement criteria were used for the first time in 2021, and that public contracting authorities put a stronger focus on the environmental pillar of sustainability and less or almost none on the economic and social pillar. The volume of demand and production was also calculated. The study found that the first contractor for sustainable product was SME company, producer of food, who adapted to the green conditions of public procurement in a short period of time. The paper empirically demonstrated that public procurement can be a powerful tool, but it was not used enough in the observed period for the observed products in RH.
Business process overhaul in dairy supply chains: An integrated approach of advanced forecasting and vehicle routing techniques
Authors: Remsei Sándor , Sakaline Golam , Uddin Md. Mahraj , Buics László
Published: December 2024

The study explores improving opportunities of forecasting accuracy from the traditional method through advanced forecasting techniques. This enables companies to optimize inventory management, production planning, and reducing the travelling time thorough vehicle route optimization. The article introduced a holistic framework by deploying advanced demand forecasting techniques i.e., AutoRegressive Integrated Moving Average (ARIMA) and Recurrent Neural Network-Long Short-Term Memory (RNN-LSTM) models, and the Vehicle Routing Problem with Time Windows (VRPTW) approach. The actual milk demand data came from the company and two forecasting models, ARIMA and RNN-LSTM, have been deployed using Python Jupyter notebook and compared them in terms of various precision measures. VRPTW established not only the optimal routes for a fleet of six vehicles but also tactical scheduling which contributes to a streamlined and agile raw milk collection process, ensuring a harmonious and resource-efficient operation. The proposed approach succeeded on dropping about 16% of total travel time and capable of making predictions with approximately 2% increased accuracy than before.
The application of predictive stochastic model based on Monte Carlo method in building energy saving renovation
Authors: Xiao Juxian
Published: December 2024

Abstract: This research has established an energy consumption prediction model based on the Monte Carlo method to resolve the energy-saving transformation problem. First, simplify the building to construct the proposed model. Second, through the principle of building energy balance and Monte Carlo method, the cooling and heat demand model of regional buildings and the energy consumption prediction model of regional buildings are built. Finally, the energy consumption simulation and energy consumption prediction of the regional building complex after energy-saving renovation are carried out. The experiment shows that the building energy consumption in July and August was relatively high, reaching 2.36E+14 and 2.4E+14, respectively. The energy consumption in April and November was relatively low, reaching 1.2E+14 and 1.4E+14, respectively. The highest prediction error was in November, reaching 12%. The lowest prediction error was in January and February, only about 2%. The error of monthly energy consumption predicted by Monte Carlo method is less than 12%, the Root-mean-square deviation is 5%, and the error between predicted and actual annual total energy consumption is only about 2%. By comparing the predicted energy consumption after energy-saving renovation with before, the energy-saving rate reached about 20%. The research results indicate that the proposed Monte Carlo based predictive stochastic model exhibits good predictive performance in building energy-saving renovation, providing theoretical guidance and reference for feasibility studies, planning, prediction, decision-making, and optimization of building energy-saving renovation.
Parametric evaluation as a tool for evaluating shell geodesic domes. Modelling the Fuller Dome with ReSa mobile recreational facility panels
Authors: Berbesz Anna , Sadowski Kajetan , Onyszkiewicz Jakub
Published: December 2024

Mobile structures are one of directions of shaping recreational facilities. In terms of their geometry, geodesic domes and quasi-dome systems deserve special attention. Panel shell domes were the subject of consideration, e.g. Buckminster Fuller and David Geiger, whose patent solutions are referred to in the article. Combining a system of layered self-supporting panels with the geometry of geodesic domes was one of the significant construction and material challenges as part of the ReSa research and the respective implementation project carried out at the Wroclaw University of Technology in 2021–2023 as part of a competition organized by The National Center of Research and Development. Concerning the preliminary analysis, it was necessary to determine the types of dome solutions intended for the implementation of research models. The article presents a detailed analysis of shell geodesic domes with different geometries. The differentiation resulted from the type and the rotation of the base polyhedron relative to the base plane. The main objective of the study was to rank the types of panel geodesic domes in relation to their use in the construction of mobile recreational facilities. The development of 12 virtual dome models made it possible to evaluate their parameters in five main research areas – energy efficiency, environmental impact, support reactions, ergonomics and complexity of prefabrication and assembly process. An extensive evaluation of the parameters in each field, a summary within each domain, and a global evaluation of the shells were performed. The study allowed to develop a hierarchy of panel dome types in relation to the assumed criteria and to check the possibility of using multi-aspect, parametric evaluation. In addition, a detailed study of the geometrical parameters of the shells carried out as part of the indirect tests made it possible to identify the most effective structures in this aspect. This study has proven that parametric evaluation of criteria is a good tool for evaluating shell geodesic domes. This method is developing both in the field of scientific research and in terms of the implementation of domes. It allows for flexible introduction of basic data (here: energy efficiency, environmental impact, support reactions, ergonomics and complexity of prefabrication and assembly process), determination of coefficients and the use of additional weight criteria for individual research fields in relation to the assumed goal.
Problems of monitoring critical elements of scaffolding
Authors: Ramezantitkanloo Amin , Czepiżak Dariusz , Pieńko Michał
Published: December 2024

Scaffolds are temporary structures that include anchors, elements, and platforms that are used during the construction of steel or concrete structures to support equipment or workers at height. Since these structures have aimed to guarantee safety and support workers at heights, the stability of scaffold systems is of significant importance. These systems have some disadvantages. For example, they are sensitive to vibrations. This feature reduces their stability under service-, cyclic-, or earthquake loadings. Furthermore, the vibrating nature of scaffolds can impose additional axial loads and consequently additional moment loads on the scaffold columns and decrease the safety of workers and increase the accidents of use of them. In this paper, a review of some research has been performed that aimed to solve this problem and improve the stability of scaffolds. These articles have investigated the behaviour of anchors and joints and the influence of imperfections and inaccuracies on scaffolds. A summary of research has been presented that has proposed new methods for predicting the behaviour, damage, and collapse of scaffolds using some structural health monitoring (SHM) methods. Finally, the research gaps and limitations of previous studies have been investigated, with a focus on monitoring and solving the problems of the scaffolds and critical elements so that these problems can be solved and evaluated in future studies.
Zones of influence for railway traffic ground-borne vibrations
Authors: Pachla Filip , Radecki-Pawlik Bartosz , Tatara Tadeusz
Published: December 2024

The article presents selected results of the assessment of the harmfulness of building vibrations and the impact of railway traffic on people staying in buildings. The research presented in the article concerns a long-term field study. Field research was conducted in various locations and with the movement of various types of rolling stock. The results were the basis for determining the zones of influence of railway vibrations on the building structure. The criteria adopted in the research were the conditions of the impact of vibrations on the structure of buildings as well as the vibration comfort for people staying in buildings and passively perceiving vibrations. The paper presents the methodology of field research and selected results from the conducted research. The proposed zones vary depending on the type of trains (freight and passenger). The range of zones also depends on the structure of the building and human perception of passively perceived vibrations. All analyses carried out for the purposes of this work are in accordance with Polish regulations and were performed by an accredited laboratory for testing vibrations and deformations of buildings. The proposed zones were adopted for use in design and diagnostic practice regarding the impact of vibrations on buildings and people in buildings.
Efficiency multi-agent model assisted Moea/D algorithm for optimization design for building taking into account annual energy consumption and annual user discomfort hours
Authors: Deng Hua , Zhou Kai
Published: December 2024

Recently, with the continuous consumption of energy, building energy conservation has been popular in the energy field. In response to the high computational cost, slow convergence speed, and low accuracy of existing optimization design methods for building energy efficiency, this study first built a multi-objective optimization model for building energy efficiency on the ground of the annual energy consumption of buildings and the quantity of uncomfortable hours for users. Then it introduces a multi-agent model auxiliary mechanism to improve the decomposition based multi-objective evolutionary optimization algorithm, and then solves the multi-objective optimization model for building energy efficiency. In order to select the optimal decision variable of the algorithm, the decision parameters were analyzed and found that the performance was optimal when the number of samples, aggregation number and base model were set to 25.3 and 20. The improved multi-objective evolutionary optimization algorithm on the ground of decomposition has average supervolume and running time values of 32416.13 and 1774.58 seconds under office buildings, and 7899.13 and 3616.96 seconds under residential buildings, respectively. In addition, the annual user discomfort time of office buildings is 555.28h, which is lower than other comparison algorithms. In summary, the optimal performance of the algorithm when the decision variable is set to 25.3 and 20. The algorithm proposed by the research institute has superior performance and has certain application value in selecting the optimal solution for building energy-saving design.
The Boron Solubility in Al-Mg-B Alloys
Authors: Zeman J. , Herman A. , Šerák J.
Published: December 2024

This study deals with the effect of magnesium content in Al-Mg-B alloy (with a boron content of about 5 wt. %) on the formation of intermetallic phases and elimination of inclusions in the form of boron powder particles in the final structure. At first look, the high melting temperature difference between pure aluminium (660°C) and boron (2076°C) appears to be a potential problem. Moreover, boron has a minimal solubility in aluminium (0.055 wt.%) and the liquidus temperature increases very rapidly with increasing boron content (liquidus temperature approx. 1 160°C at 5 wt.% for Al-B binary alloy). Alloying with magnesium results in the transformation of the intermetallic phases AlB12 and AlB2 to the (Al, Mg)B2 phase and has a significant beneficial effect on the formation of intermetallic boron phases in the aluminium alloy without residual boron powder particles.
Optimization of 3D Printed Patterns for the Hybrid Investment Casting Technology
Authors: Štěpán R. , Krutiš V. , Jelínek R. , Petřík M.
Published: December 2024

Currently, great emphasis is placed on the production of castings with complex shapes. The hybrid investment casting technology using 3D printed models offers new possibilities in the production of such complex and thin-walled castings. The motivation for this paper was to find a solution to the problem with ceramic shells cracking during the 3D model firing stage. The main factors affecting the shell cracking are the thermal expansion of the model and the shell material, and the newly considered pressure of the gas closed in the ceramic shell cavity. First, thermal analyses were performed of a commercial material used for 3D printing - Polymaker PolyCast™. The characteristics yielded by the measurements helped establish the glass transition temperature, the autoignition temperature and the behaviour of the gas produced by the model burning. Suitable experimental models in the shape of tetrahedrons were designed and used for a number of experiments. The tests confirmed that cracks only occur during shock firing in models printed by the FFF technology with 0% of infill. A solution suggested for further experiments is purposeful venting of the models. Practical testing of the optimization has also been performed. The last step was measurement of the heat transfer through the ceramic shell after being placed in the annealing furnace. There were temperature evolution profiles in the system model-ceramic shell obtained.
Ultrasonic Crystallization of Monotectic Zn-2%Bi Alloy
Authors: Szot A. , Boczkal G. , Pałka P.
Published: December 2024

In current studies, the authors examined the influence of ultrasonic vibrations on the solidification of Zn – Bi 2% alloy. The research reveals that ultrasonic vibrations have a sufficient influence on the crystallization process. In the case of both groups of ingots (Zn and Zn-2%Bi), the differences in microstructure and mechanical properties could be observed. The methodology was based on the casting of two samples from the same ingot form with identical configurations. One of the samples was used as the reference (cast without ultrasonic) and the other to examine ultrasonic vibrations' influence. Casting with ultrasonic vibration was carried out with a frequency of 35 kHz. Sonotrode was located on the underside of the designed crucible. The samples were circular shape with a diameter of 50 mm and a thickness of 10 mm. A tensile compression test, Vickers microhardness test and microscopy analysis were performed. The results showed enhanced organization of microstructure and the fragmentation of grains in the case of the ingots with the ultrasonic vibration presence.
The implementation of information technology (IT) in the dynamic management of coal demand and supply processes
Authors: Marlęga Radosław , Dragić Slavko , Dydo Małgorzata
Published: December 2024

The article presents a methodological approach that encompasses the conceptualisation of a design idea and the implementation of an information technology (IT)-based solution to support models developed for energy mix management. It identifies the key elements that influence the definition and subsequent creation of an IT solution, focusing on processes that reflect both the demand (coal demand) and supply sides. In terms of the supply side, the IT solution will be equipped with planning information: Regarding minable resources, including general data on the resources currently held and the planned annual resources to be mined (qualitative data will not be included) The mining plans for each mine are accompanied by qualitative data (data that are standardised to ensure the quality of the production data collected. In addition to mining plans, the supply side will have up-to-date information on coal already mined. This information will be presented in quantitative and qualitative terms at various stages of the product life cycle, which begins with the mining of raw coal and ends with the formation of a finished product that can be sold and transported to the customer. The article indicates the key elements that must be precisely defined for the correct definition of processes on the demand side and the supply side, and in what order actions should be taken by IT specialists so that this solution fully satisfies the teams managing the processes dynamically.
Research on image preprocessing algorithm based on mixed denoising and texture weakening of ore images
Authors: Luo Hui , Cai Gaipin , Zou Haoxiang
Published: December 2024

Ore particle size information is an important basis for mining enterprises to regulate crushing parameters, due to the complex and harsh environment during the acquisition of ore images on the conveyor belt, resulting in the existence of a variety of composite noise interference in the motion target image, the surface texture characteristics of the ore and the edge of the fuzzy and other problems, thus affecting the effective acquisition of ore particle size information. To address the above issues, an image-denoising network based on global and local feature extraction and an edge enhancement algorithm for texture feature weakening is proposed. The denoising network consists of a shallow local feature extraction module and a Transformer-based U-Net global feature extraction module, which aims to combine the powerful global modeling capability of the Transformer with the local modeling advantage of convolutional network, and reconstructs the image resolution through the dual up-sampling structure, to realize the accurate output of contextual detail information. A texture weakening method based on wavelet transform and fast non-local averaging is proposed to smooth the image and weaken the texture characteristics of the ore surface, and edge sharpening is combined with Bilateral- USMR to enhance the edges of the ore particles to realize the preprocessing of the ore image. The preprocessing results were objectively evaluated and experimentally verified. The results show that the image preprocessing method improves the accuracy of image segmentation and the applicability of the ore particle size measurement technology in complex environments.
A generic precurved interlocking nail is more compatible with femoral and tibial morphology than a straight nail in dogs
Authors: Rousseau Thomas , Jourdain Mathieu , Godart Benjamin , Maitre Pierre , Cachon Thibaut , Leperlier Dimitri , Gauthier Olivier
Published: December 2024

OBJECTIVE

To study the morphology of canine and feline femurs and tibias in lateral radiographic projections and assess their compatibility with either a straight or a curved full-length interlocking nail (ILN).

METHODS

Lateral projection radiographs of 50 tibias and 50 femurs (10 cats and 40 dogs per bone) were used to measure the minimum and maximum radius of curvature of an ILN compatible with each bone. These radii were defined by cranial and caudal endosteal points at the proximal entry point of the nail, at the isthmus, and at the most distal point of the ILN insertion into the femoral or tibial metaphysis. These points were figured by 2 proximal circles, 2 diaphyseal circles at the isthmus, and 2 distal circles in distal metaphyses of the bones. The diameter of these circles corresponded to 75% of the medullary canal width at the isthmus of the bone.

RESULTS

An ILN with a radius between 750 and 806 mm fit 87% of all the bones reviewed. In dogs, an ILN within this radius range would fit 95% of the tibias, whereas a straight ILN would fit only 50%. For femurs, the curved ILN would fit 80% compared to 37.5% for a straight ILN. In cats, an ILN with a radius between 750 and 806 mm would fit 85% of the bones (femur, 100%; tibia, 70%), whereas a straight ILN would fit all tested bones.

CONCLUSIONS

A full-length ILN with a radius of curvature between 750 and 806 mm would fit 87% of the studied bones, whereas only 55% of them could accept a straight ILN.

CLINICAL RELEVANCE

A full-length ILN with a 750–806-mm curvature radius may provide a suitable option for treating most femoral and tibial diaphyseal fractures.
Mild hypothermia is associated with altered volume kinetic parameters of an intravenous crystalloid fluid bolus in healthy isoflurane-anesthetized cats
Authors: Gelendi Stefania , Yiew Xiu Ting , Bateman Shane , Gerken Katherine , Kuo Kendon W. , Ravis William R. , Johnson Aime K. , Liao Pen-Ting
Published: December 2024

OBJECTIVE

To assess the impact of mild hypothermia on the distribution and elimination of an IV crystalloid fluid bolus in healthy anesthetized cats using volume kinetic (VK) analysis.

METHODS

10 adult cats were anesthetized and included in a prospective, randomized, cross-over study. The subjects were maintained either normothermic (38.3 ± −16.9 °C) or mildly hypothermic (35 ± −16.9 °C), with a 7-day washout period between anesthetic episodes. All cats received 20 mL/kg of a balanced isotonic solution (Normosol-R) IV over 20 minutes, following the achievement and stabilization of target temperature. Hemoglobin concentration, PCV, and urinary output were measured at established time points and served as input variables for VK analysis.

RESULTS

Hypothermia was associated with a larger central compartment volume (Vc); higher body weights were associated with an increased Vc and a decreased elimination rate; higher end-tidal isoflurane concentration (ETISO) was associated with an increased Vc and a higher distribution rate constant. Heart rate, blood pressure, and ETISO were significantly lower in the hypothermic group. No statistically significant difference was observed in urinary output between groups.

CONCLUSIONS

Body weight, temperature, and ETISO were significant covariates affecting VK parameters. Hypothermia did not induce cold diuresis but was associated with an increase in Vc. The negative relationship between body weight and the elimination rate constant requires further verification. Hypothermia was associated with lower heart rate and blood pressure despite reduced ETISO.

CLINICAL RELEVANCE

Hypothermia was associated with smaller plasma volume expansion from fluid bolus. Fluid dosing based on ideal body weight should be considered to avoid overdosing.
Does Green Accounting Matter for Financial Performance? Evidence from the Indonesia Mining Sector
Authors: Setiawan Jodi , Diantimala Yossi , Lautania Maya Febrianty , Sayuthi Sayuthi
Published: December 2024

This study examines the influence of green accounting–environmental cost, environmental disclosure, and environmental performance–on the financial performance of companies in the mining sector. The population were mining companies listed on the Indonesia Stock Exchange from 2020 to 2023. The samples were selected using the purposive technique and the number of observations is 144 firm-years. Using the multiple regression method, this study revealed that green accounting positively affects the financial performance of the sample companies. Disclosure and environmental performance positively impact financial performance, while the effect of environmental costs on financial performance is not significant.
Ownership Structure, Board Size, and Carbon Emission Disclosures: Empirical Evidence from ASEAN-5 Countries
Authors: Lina Lina , Rohmah Faizah Syifa
Published: December 2024

This study aims to investigate the influence of institutional ownership structure and managerial ownership on corporate carbon emissions disclosure in ASEAN-5 with the size of the board of commissioners as a moderator. Large-cap companies listed on each ASEAN-5 countries’ stock exchange were selected as research samples. The sample companies have published sustainability reports and integrated annual reports that disclose carbon emissions between 2018 and 2022 (175 company-year observation). Using multiple linear regression analysis, this study found that institutional ownership and managerial ownership have a negative impact on carbon emissions disclosure. The role of board of commissioner size was found weakening the negative relationship between institutional ownership and managerial ownership on carbon emissions disclosure.
CHARACTERISTICS OF STRABISMUS OPERATION AT SANGLAH RSUP DENPASAR IN 2019 - 2020
Authors: Suari Ni nyoman Trihasti , Surasmiati Ni Made Ayu , Suryathi Ni Made Ari , Kusumadjaja Made Agus
Published: December 2024

The eye is one of the important senses for humans, through the eye, human receive visual information that is used to carry out various activities. Perfect eyes are everyone's dream, but it is not always owned because the eyes can also experience abnormalities, one of which is strabismus or crossed eyes. Strabismus is a condition in which the eyeballs are not in the same direction. This study aims to determine the characteristics of strabismus surgery patients based on gender, age, deviation direction, degree of deviation, and surgery. This research is a descriptive research with cross-sectional design. Total sampling was used as a sampling technique. Data was collected using patient medical records at Sanglah Hospital Denpasar in 2019 - 2020. Patients with age <15 years with the highest percentage at 51.3%. Based on the gender, 51.4% of the patients are female. The direction of deviation of esotropia was the most common type (51.4%) with a degree of deviation of 30 – 45 PD (56.7%). The most frequently performed surgery was two-muscle recession as much as 35.1 %.
Keywords : Strabismus, surgery, deviation