bluuebunny/crossref_metadata_2025 huggingface dataset:
NON-DESTRUCTIVE TESTING OF CIPP DEFECTS USING A MACHINE LEARNING APPROACH
Authors: Dvořák Richard , Pazdera Lubos , Topolář Libor , Jakubka Lubos , Puchýř Jan
Published: October 2024

In civil engineering, retrofitting actions involving repairs to pipes inside buildings and in extravehicular locations present complex and challenging tasks. Traditional repair procedures typically involve disassembling the surrounding structure, leading to technological pauses and potential work environment disruptions. An alternative approach to these procedures uses the cured-in-place-pipe (CIPP) technology for repairs. Unlike standard repairs, CIPP repairs do not require a disassembly of the surrounding structures; only the access points at the beginning and end of the pipe need to be accessible. However, this method introduces the possibility of different types of defects.1 This research aims to observe the defects between the host and newly cured pipes. The presence of holes, cracks, or obstacles prevents achieving a desired close-fit state, ultimately reducing the life expectancy of the retrofitting. This paper focuses on the non-destructive observation of these defects using the non-destructive testing (NDT) impact-echo (IE) method. The study explicitly applies this method to the composite segments inside concrete host pipes, forming a testing polygon. Previous results have indicated that the mechanical behaviour of cured composite pipes can vary in stiffness depending on factors such as the curing procedure and environmental conditions.2 The change in acoustic parameters such as resonance frequency, attenuation and other features of typical IE signals can describe the stiffness evolution. This study compares different sensors used for the proposed IE testing, namely piezoceramic and microphone sensors. It evaluates their ability to distinguish between the defects present in the body of a CIPP via a machine-learning approach using random tree classifiers.
This research aims to observe defects between the host and newly cured pipes. However, the presence of holes, cracks, or obstacles prevents attaining this desired close-fit state, ultimately reducing the life expectancy of the retrofitting action. This paper focuses on the non-destructive observation of these defects using the NDT Impact-Echo (IE) method. The study explicitly applies this method to CIPP composite pipe segments inside concrete host pipes, forming a testing polygon. Previous results have indicated that the mechanical behaviour of cured CIPP composite pipes can vary in stiffness depending on factors such as the curing procedure and environmental conditions. The change of acoustic parameters such as resonance frequency, attenuation and other features of typical IE signals can describe the stiffness evolution.
This paper compares different sensors used for IE proposed testing, namely piezoceramic and microphone sensors. It evaluates their ability to distinguish between defects present in the body of the CIPP via a machine-learning approach using random tree classifiers.
EVOLUTIONARY OPTIMIZATION OF WIRE EDM PROCESS FOR THE SURFACE FINISH ON A MAGNESIUM AZ91D ALLOY USING AN ANN AND A GENETIC ALGORITHM
Authors: Pradeepkumar Madhesan , Jesudas Thangaraj , Sasikumar Chandrasekaran , Narasimharajan Mani
Published: October 2024

In this research the optimizations of the wire EDM process parameters to achieve a minimal surface roughness on a magnesium AZ91D alloy have been carried out. The experiments were conducted with three machining factors, i.e., the pulse-on time, the pulse-off time, and the wire feed, using a Box-Behnken design of experiment. The effects of the Artificial Neural Network (ANN) and the Response Surface Methodology (RSM) models were compared and studied, and it has been found that the ANN approach predicts the perfect output response. The genetic algorithm (GA) was then utilized to determine the best machining parameters to provide a better surface finish using the projected ANN outcomes, which were then used to build a quadratic equation. Furthermore, the optimum machining parameters were identified for a better surface finish through the integration of the ANN and GA approach. Based on the aforementioned findings, this study showed that the suggested methods are capable of predicting the optimum machining parameters, which would be beneficial in the low-cost manufacturing sector.
INTERFACIAL BONDING OF POLYAMIDE-REINFORCED CARBON FIBRE VIA ADDITIVE MANUFACTURING
Authors: Khalid Nisa Naima , Radzuan Nabilah Afiqah Mohd , Foudzi Farhana Mohd , Sulong Abu Bakar , Rahman Nurul Najwa Abd
Published: October 2024

Printing orientation in polymer additive manufacturing (AM) is a crucial factor that affects both printing accuracy and the mechanical properties of the final products. Notably, printing orientation influences the interfacial bonding within printed lay-ups, thereby altering the mechanical properties to meet specific application requirements. This paper reviews studies on polyamide reinforced with carbon fibre, evaluating the impact of printing orientation, where interfacial bonding affects mechanical properties. The review shows that the common three printing orientations, 0°, 45°, and 90°, are often discussed in terms of tensile strength, fracture toughness, and electrical performance. Factors such as continuous-carbon-fibre raster angle, stacking sequence and loading direction are believed to be the main factors affecting mechanical properties. Among these, the 0° printing orientation is often associated with the highest tensile strength and stiffness due to the strong interfacial bonding between the polyamide and reinforcing carbon fibres in AM.
PREPARATION AND PROPERTIES OF NICKEL-PLATED ALUMINUM POWDER
Authors: Zhang Xiang , Zhang Min , Han Dong , Zhao Wenqi , Su Xiaolei
Published: October 2024

Nickel-plated aluminum powder was prepared by a double reduction system of sodium hypophosphite and hydrazine. The effects of different amounts of nickel coating on the morphology, phase, compaction resistivity and electromagnetic parameters of nickel-plated aluminum powder coating were studied. The results of XRD and SEM clearly show that the nickel-plated aluminum powder was prepared successfully in a dual reduction system. In addition, the nickel-plated aluminum powder also has good absorbing properties in the X-band. The results show that when the nickel coating amount is 50 w/ % and the impedance matching thickness is 2.6 mm, the reflection loss value is less than –10 dB in the range 8.49–12.40 GHz. At the same time, when the impedance-matching thickness is 2.4 mm and the frequency is 10.45 GHz, the reflection-loss value reaches its best value of –25.88 dB. The composite material presents excellent corrosion resistance and electromagnetic shielding properties, which provides a new strategy for the development of electroless plating composite materials.
COMPARISON OF CORROSION BEHAVIORS OF B1, BA11, BZ11 AND BC11 MAGNESIUM ALLOYS
Authors: Mao Zhiwen , Jia Zheng , Du Sichao , Yu Yongzhi
Published: October 2024

The Mg-Bi alloy, commonly referred to as the "green metal," finds extensive applications in industries such as automotive and aerospace due to its exceptional corrosion resistance. The corrosion performance of this alloy is intricately linked with its elemental composition. In this investigation, four distinct types of homogeneous magnesium alloys were meticulously prepared: Mg-1Bi (B1), Mg-1Bi-1Al (BA11), Mg-1Bi-1Al (BZ11), and Mg-1Bi-1Cu (BC11). Subsequently, a comprehensive analysis was conducted to examine the microstructures and corrosion behaviors exhibited by these magnesium alloys, exposed to a 3.5 w/% NaCl aqueous solution. The corrosion resistance test reveals that the corrosion resistance ranking of the four materials is as follows: BZ11 > BA11 > B1 > BC11. Among them, the uniform state of BZ11 alloy exhibits the lowest corrosion rate, measuring 0.548 mm·y–1, primarily attributed to its fine grain size and a small amount of dispersed second phase particles. Conversely, the uniform state of BC11 alloy demonstrates inferior corrosion resistance due to a high content of second phase particles within the alloy composition. SEM and EDS techniques were employed for microstructure characterization of all four magnesium alloys. The results indicate that localized corrosion occurs in all four alloys, with the electrochemical corrosion between the second phase particles and the matrix being specifically identified as the primary cause for degradation of BC11 alloy. XRD analysis confirms that in Mg-Bi alloy, the α-Mg phase coexists with block- or strip-shaped Mg3Bi2 phases as secondary phases. In contrast, BA11 and BZ11 alloys exhibit no change in secondary phases, consisting mainly of the α-Mg phase and Mg3Bi2 phase. On the other hand, BC11 alloy predominantly contains the α-Mg phase, Mg3Bi2 phase, and reticular Mg2Cu as secondary phases.
EFFECT OF Nb, Ta, AND Ti MICROALLOYING ON THE SECONDARY HARDENING OF Mo-W TOOL STEEL
Authors: Burja Jaka , Nagode Aleš , Grabnar Klemen , Medved Jožef , Balaško Tilen
Published: October 2024

This work investigates the influence of microalloying elements on the tempering process of a hot-work tool steel. The study examines the austenitisation temperatures and grain growth of a high thermal conductivity hot-work tool steel, with the addition of various microalloying elements: Nb+0.06 w/% Nb, Ta+0.03 w/% Ta, and Ti+0.006 w/% Ti, compared to a reference sample. Thermodynamic calculations are used to analyse the influence of microalloying on the transformation temperatures and carbide formation. Austenitisation temperatures of (1030, 1060, 1080, and 1100) °C are selected, and subsequent tempering is performed at (540, 580, 600, 620, and 640) °C. The investigation focuses on analysing the microstructure, hardness, and grain size. The results show that the microalloying elements have a positive influence on the retention of the grain size during austenitisation and on the enhancement of hardness during tempering. Electron microscopy is utilized to analyse the microstructure, which indicates the prevalence of Mo-W carbides. The carbides exhibit coarsening and morphological changes during high-temperature tempering. The secondary hardening peaks occur at temperatures between (600 and 620) °C, and are more pronounced by microalloying.
EXPERIMENTAL STUDY OF THE MECHANICAL PROPERTIES OF BRICKS MADE FROM DREDGED SILT
Authors: Zhang Jian , Zhang WenBin , Zhu Xiangliang
Published: October 2024

Numerous dredging and desilting projects in harbor and waterway transportation initiatives generate substantial quantities of dredged mud. Traditional methods, such as blowing and filling, occupy land resources and lead to secondary pollution. The offshore disposal of mud incurs high costs and environmental pollution. Consequently, this paper proposes a silt brick-making method devoid of sintering, autoclaving, and pressing. After a designated maintenance period, the silt bricks are examined to assess the influence of cement, initial moisture content, and age on their compressive and flexural strength. It is feasible to prepare silt bricks by mixing additive materials with silt, followed by molding, vibration, maintenance, demolding, and additional maintenance. As the age increases, the slope of the stress-strain curve for specimens at 1.0× and 1.5× the liquid limit increases accordingly. As the age increases, the slope of the stress-strain curve of the specimen increases, albeit not as rapidly as at 1.5× the liquid limit. The strain at failure remains consistent, primarily within the range of 2–3 %. Silt bricks containing cement-doped marine dredged sludge exhibit increased compressive and flexural strengths with higher cement doping levels, demonstrating a linear relationship between the two. Moreover, as the cement doping and maintenance age increase, the compressive modulus of silt bricks gradually increases, indicating an associated increase in brittleness. The research findings offer a theoretical framework for sintering-free, autoclaved, and pressed dredging silt bricks. This contributes to advancing offshore geotechnical disposal technology in China and holds reference value.
INFLUENCE OF A TOOL’S ROTATIONAL SPEED ON THE MECHANICAL PROPERTIES OF FRICTION-STIR-WELDED JOINTS OF DISSIMILAR AA6082 AND AA5052 ALUMINIUM ALLOYS
Authors: Debih Ali
Published: October 2024

This study examines the influence of a tool’s rotational speed on the microstructure and mechanical properties of dissimilar friction-stir-welded joints of AA6082 and AA5052 aluminium alloys. The joining process was carried out at various rotational speeds of 600 min–1, 1000 min–1, and 1400 min–1 and a constant welding speed of 35 mm/min using a high-speed-steel (HSS-Co5) tool with a cylindrical pin. The microstructure of the welded joints was characterized using optical microscopy. The Vickers microhardness, tensile properties, and impact strength of welded joints were evaluated and compared to base metals. Results showed that the mechanical properties and the joint performance were considerably influenced by the tool’s rotational speed due to the amount of heat input and the formation of macroscopic defects in the stir zone. It was found that a rotational speed of 1000 min–1 is the suitable welding parameter for optimum mechanical properties. The welded joint at 1000 min–1 shows a tensile strength of 122 MPa, elongation of 8.1 %, specific impact strength of 0.43 J/mm2, and a maximum microhardness of 75 HV in the stir zone. In all welded joint samples, the fracture locations were near the edge of the welded zone on the retreating side. The results provide further insight into the appropriate selection of FSW process parameters that ensure excellent joints between AA5052 and AA6082 alloys with the required mechanical properties.
Ensino de segurança do paciente na graduação de enfermagem em Minas Gerais: estudo documental
Authors: De Almeida Meire Cavalieri , Brugger Érika Bicalho de Almeida , Martins Jussara Regina , Silva Esther Suellem Rocha , Ignácio Sara Carvalho , Vieira Taise Miguel
Published: October 2024

OBJETIVOS: Analisar o ensino sobre segurança do paciente nos cursos de graduação em Enfermagem em Minas Gerais. MATERIAIS E MÉTODOS: Estudo documental de abordagem quantitativa. Foram incluídas as instituições de ensino superior do estado que disponibilizassem ementas das disciplinas publicamente. Foram realizadas análises descritivas por meio de frequências. Comparações foram realizadas pelos testes Qui-quadrado ou Fisher Exato. RESULTADOS: Foram incluídas 25 instituições de ensino superior em Enfermagem. Entre as 1462 disciplinas analisadas, constatou-se que o tópico mais abordado foi a “interação com pacientes e cuidadores” (presente em 24,8% delas), seguido por “melhoria na segurança da medicação” (18,8%), “prevenção e controle de infecção” (17,8%) e “ser participante de uma equipe eficaz” (13,9%). Alguns termos como, por exemplo, “Cultura de culpa” e “falibilidade humana” não foram identificados em nenhuma disciplina. CONCLUSÃO: Este trabalho explicita que muitos tópicos fundamentais ao ensino da segurança do paciente têm sido deixados de lado pelas instituições de ensino superior em Enfermagem. Faz-se necessário, não somente uma atualização das ementas curriculares, como também uma revisão dos métodos de ensino-aprendizagem para o desenvolvimento de competências dos futuros profissionais.
Changing Technological Landscape of Global Energy Sector: Drivers and Opportunities
Authors:   ERI RAS, Kulagin Viatcheslav , Grushevenko Dmitry ,   ERI RAS, Galkina Anna ,   ERI RAS
Published: October 2024

The article provides an overview of the key expected changes in the technological landscape of the global energy sector. On the part of the end-use energy consumption sectors, the requirements for energy systems and the organization of their operation are changing significantly. Consumers are demanding ever more versatile, environmentally friendly, cost-effective and reliable energy supplies, and energy-intensive equipment with off-grid options is increasingly in demand. Technical progress, in turn, provides access to new solutions, while changing the parameters of inter-fuel competition. Government policy also contributes, and its tools allow both to softly influence the attractiveness of the choice and to simply limit the possibilities of using certain equipment. Electrification is becoming a key trend in the supply of energy to industry, commercial and residential sectors. The transportation sector is moving from an era of oil dominance to an era of inter-fuel competition, with electric solutions also becoming a key substitute for petroleum products. In the electricity generation sector itself, preference is increasingly being given to carbon-free and renewable energy sources. In some regions of the world, renewable energy sources are already becoming competitive in terms of the cost of electricity production (before feeding into the grid) with fossil generation. It is important that with an increase in the share of renewable energy sources in the electricity balance, the share of costs for backup, storage, and network infrastructure increases, which makes it necessary to assess costs in a complex manner when making decisions. The growing share of renewable energy sources in energy systems necessarily requires the development of storage technologies; however, the current level of scientific and technological progress in this area makes such solutions extremely expensive, which leaves long-term niches for thermal generation, but significantly changes its operating modes. Technologies are also changing significantly in the field of exploration, production and transportation of fossil fuels. This makes it possible not to fear resource shortages in the coming decades, despite rising production levels and the depletion of the easiest-to-exploit reserves. But the operating environment for conventional energy will change.
Analysis of ESG Ratings’ Methodologies in the Russian Market: Transparency and Convergence Issues
Authors:   HSE University, Nosko Polina
Published: October 2024

Reliability of ESG ratings, which represent a tool for organizations’ sustainability performance assessment, has been studied and sometimes questioned by academic researchers and international organizations. In response to criticism, regulations emerged targeting the revealed problems and their sources. Russia, where the ESG ratings market has grown significantly over the last two years, is no exception. The paper aims at assessing the transparency level of ESG ratings methodologies in the Russian market and identifying whether they converge. To achieve the goal, the author scrutinized publications of foreign and Russian authors, international organizations, and the Central Bank of Russia, analyzed the methodologies of the leading Russian ESG ratings, developed and applied the method to assess the transparency level of such methodologies using ten indicators. The paper provides a brief overview of the key problems inherent in ESG ratings and highlighted in the literature, as well as the way they are addressed by regulation initiatives in a number of foreign countries and in the Russian Federation. In order to verify the implementation of the recommendations of the Central Bank of Russia in the updated ratings methodologies, an analysis of the approaches of four agencies (the Analytical Credit Rating Agency (ACRA), Expert RA, RAEX, and the National Rating Agency) was carried out in terms of transparency and convergence; the agencies’ methodologies were assigned points relative to a specific transparency level. The conclusion made is that there is some convergence of assessment approaches, primarily in terms of rating scales and weighting of ESG components, and there is a high level of transparency in methodologies of the Russian ESG ratings.
Bricks for the Pyramids: Foreign Participation in Egyptian Megaprojects
Authors:   IOS RAS, Orlov Ilia ,   HSE University, Ufimtsev Andrey ,   IAS RAS,   HSE University
Published: October 2024

This is not the first time Egypt has resorted to implementing large-scale projects and attracting foreign funds in order to solve the problems of economic development. In the 19th century, the Suez Canal became such a project, and in the 20th century, the Aswan Dam. Each time, Egypt had to pay a high price for these initiatives. In the 21st century Egypt faces many economic problems: overpopulation, food shortages, unemployment, overload of the energy system, inflation and devaluation of the national currency, budget deficit, etc. The centralized governing model again led Egypt to the idea of megaprojects and again forced it to turn to the resources of other countries. However, this time Egypt is being cautious and trying to diversify foreign investment. In a sense, joining BRICS is a manifestation of this caution. The work identifies three groups of countries and examines their contribution to the megaprojects being implemented in modern Egypt. Based on this analysis, it is concluded that the OECD and BRICS-5 countries participate both as investors and as contractors, while the GCC countries almost always act as investors. At the same time, the BRICS-5 and GCC countries are usually represented by state corporations and sovereign funds, while the OECD countries are more often represented by private companies. This fact emphasizes the importance of BRICS as a platform for interstate negotiations that can expand cooperation between Egypt and other member countries of this organization. However, when choosing partners, Egypt is guided more by economic rather than political considerations, wanting to maintain neutrality in world politics and not become dependent on any of the political blocs. The country's economic future is uncertain, so maintaining financial and political independence in the future is a challenge for Egypt.
VICISSITUDES DA SUPERVISÃO DE ORIENTAÇÃO PSICANALÍTICA
Authors: Penna Paula Dias Moreira
Published: October 2024

A supervisão clínica é uma prática comum entre os psicanalistas, seja no campo clínico ou institucional. Para defini-la e compreender sua gênese é preciso retomar seu histórico - seu desenvolvimento desde Freud -  já que há, em torno dela, alguns impasses e conflitos que merecem ser destacados. Essa prática, que inicialmente era informal, passou por institucionalizações e compôs um dos eixos da formação dos analistas juntamente com o estudo teórico e com a análise pessoal. O supervisionando pode se direcionar ao supervisor com dificuldades na condução de um caso, dúvidas quanto ao diagnóstico, ou seja, questões que dizem respeito à direção do tratamento ou ao manejo da transferência. Ele também pode direcionar ao supervisor questões que o tocam em torno do caso, marcando aí sua posição subjetiva. Será discutido nesse texto como se estabeleceu a prática de supervisão a partir de Freud, prática que relaciona-se com a própria história da psicanálise e sua difusão. Essa retomada será iniciada, localizando os momentos que antecedem a institucionalização da supervisão pela a Associação Internacional de Psicanálise – IPA, levantando os momentos em que Freud se apresenta ora como supervisor, ora como supervisionando, uma vez que ‘a supervisão se impõe’ quando há experiência clínica. Em seguida, se discutirá como se constituiu o movimento de institucionalização da psicanálise, com o objetivo inicial de zelar pela correta aplicação da técnica e evitar possíveis desvios pelos praticantes. Na sequência, será trabalhada a crítica estabelecida por Jacques Lacan do modelo estabelecido pela IPA e a consequente fundação da Escola Freudiana de Paris, em 1964.
CONSELHO TUTELAR: UMA PREMISSA PARA O PRINCÍPIO DA PROTEÇÃO INTEGRAL
Authors: Pordeus Marcel Pereira , Oliveira Romário Nascimento de , Josino Josivan Rocha , Caetano Wildeson de Sousa , Fonteles José Célio Pessoa , Ribeiro Elaine de Almeida , Ribeiro Carlos Augusto Nascimento , Nunes Katianne Jamilia Oliveira , Arruda Márcia Andrea Maia
Published: October 2024

O presente artigo tem por objetivo discutir o papel do Conselho Tutelar enquanto premissa na efetivação do princípio da proteção integral, disposto no ordenamento constitucional brasileiro. Ao considerarmos o contexto das políticas públicas voltadas para a Juventude, o Conselho Tutelar surge como um órgão permanente e autônomo vinculado à administração pública direta. Nesse sentido, esta pesquisa se trata de uma revisão de literatura, com abordagem qualitativa, que busca evidenciar quais os aspectos mais discutidos em torno do papel do Conselho Tutelar enquanto política social voltada para a criança e adolescente.
UTILIZAÇÃO DO PEROXIDO DE HIDROGÊNIO COMO MITIGADOR DA SALINIDADE DO SOLO NA CULTURA DO MAMÃO FORMOSA
Authors: Farias Afonso dos Anjos , Santos Lucas Barbosa dos , Andrade Neto Torquato Martins de , Santos Edeilton Borges dos , Anjos João Marcos Xavier dos , Souza Ariel Mahatman Santos Sampaio , Dourado Greisson Amarante , Pimenta Antônio Hebert Pires , Cavalcante Nádja Shirley de Andrade
Published: October 2024

A salinidade é um dos principais fatores que influenciam negativamente o desenvolvimento das plantas, prejudicando a absorção de nutrientes e, consequentemente, comprometendo o crescimento vegetal em todos os seus estágios. A cultura do mamoeiro, em particular, é sensível a altos níveis de salinidade, o que pode resultar em desenvolvimento limitado. Diante disso, este estudo teve como objetivo avaliar a eficácia do peróxido de hidrogênio como agente mitigador dos efeitos da salinidade no solo para a cultura do mamoeiro. O experimento foi realizado em um viveiro localizado na propriedade Olaria Miliano, no município de Cafarnaum, Bahia. O delineamento experimental adotado foi em blocos casualizados, com tratamentos compostos pela combinação de dois fatores: condutividade elétrica da água de irrigação (CEa dS m⁻¹ = 2,30) e quatro concentrações de peróxido de hidrogênio (H₂O₂) (0; 0,50; 10,00; 30,00; e 50,00 μM). Foram utilizados vasos contendo 5 kg de solo coletado na propriedade, classificado como Latossolo Vermelho Eutrófico e Cambissolo Háplico Ta Eutrófico, ambos de textura argilosa e coletados a uma profundidade de 0-20 cm, sendo o solo destorroado e peneirado antes do uso. Os resultados obtidos indicaram que os tratamentos foram eficazes na mitigação dos efeitos da salinidade no solo. Entre os parâmetros avaliados, o peróxido de hidrogênio demonstrou relevância, destacando-se a concentração de 50 µM, que apresentou resultados superiores em 7 dos 11 parâmetros analisados. As exceções foram a altura da planta, em que a dosagem de 10 µM resultou em 27,55 cm; o número de folhas, com 10,25 folhas na dosagem de 0,50 µM; a área foliar, onde o tratamento controle apresentou o maior valor (300,05 cm²); e a massa fresca da parte aérea, com 11,70 g na dosagem de 10 µM. Esses achados sugerem que o uso de peróxido de hidrogênio pode ser uma estratégia eficiente e economicamente viável para atenuar os efeitos prejudiciais da salinidade, com a dosagem de 50 µM sendo especialmente promissora.
TRANSFORMAÇÕES GEOMÉTRICAS NO ESPAÇO: UMA APLICAÇÃO INTERATIVA PARA APRENDER GEOMETRIA COM A CONSTRUÇÃO DE UMA CENA NO APP SÓLIDOS RA
Authors: Santos Érika Natália de Lima , Lopes Mikaelly Karollainny Santos , Lima Elielson Magalhães
Published: October 2024

A pesquisa é justificada pela importância de aprofundar o conhecimento dos alunos acerca da geometria das transformações, tendo em vista os benefícios desse conteúdo para o aperfeiçoamento da visão espacial, por exemplo. A Realidade Aumentada é uma tecnologia imersiva que proporciona melhor visualização do que assunto estudado, sendo útil para a aprendizagem da geometria. Dessa forma, este estudo objetiva investigar a contribuição do aplicativo Sólidos RA no processo de compreensão, identificação e aplicação de transformações geométricas em um ambiente tridimensional. Para isso, realizamos a pesquisa com 20 alunos de uma turma do 9º do ensino fundamental II de uma escola pública municipal de Arapiraca-AL. A intervenção foi realizada em formato de oficina com duração de quatro horas, realizada ao longo de dois dias nos quais ministramos a aula teórica e uma atividade de construção de uma cena específica no módulo de criação do Sólidos RA. Esta pesquisa é de caráter qualiquantitativo, tendo como técnicas de coleta de dados: a aplicação de pré-teste e pós-teste com perguntas abertas e o registro das cenas criadas no módulo de criação do aplicativo. Por fim, os resultados sugerem que a utilização do app Sólidos RA pode ser uma estratégia vantajosa para aperfeiçoar a compreensão do conteúdo de transformações geométricas no que tange a identificação e aplicação dessas transformações no plano e, principalmente, no espaço.
Desacralización de la nación en el arte colombiano (1930-2015)
Authors:   Universidad de Antioquia, Rodríguez Sierra Ana María
Published: October 2024

El arte contemporáneo exhibe una cara esperpéntica de la nación colombiana y desacraliza sus símbolos mediante el uso de distintos recursos que incluyen la desheroización de las figuras patrias, el cuestionamiento a unos discursos históricos que los artistas conciben como desfasados y excluyentes, y la superposición de la actualidad sobre el pasado. Al abordar la crítica y la denuncia de valores e ideas que propone el arte desde la instauración de la república hasta principios del siglo XX, y acudiendo a obras que tratan asuntos sociales, políticos, económicos y religiosos, Desacralización de la nación en el arte colombiano (1930-2015) indaga por temas vertebrales nuestra cultura, para lo cual despliega una lectura transdisciplinar que pretende aportar a los estudios sobre arte contemporáneo en el país, a la disciplina histórica y a la historia del arte.
La expresión filosófica de Walter Benjamin y María Zambrano: entre poetas y profetas de un pretérito olvidado
Authors:   Universidad de Barcelona, Hernández-Gutiérrez Luis-Eduardo
Published: October 2024

El objetivo del presente trabajo es mostrar que las conexiones cognoscitivas y ontológicas entre Benjamin y Zambrano, más que simples similitudes y diferencias, se fundamentan en el ejercicio mismo de su acción expresiva. Junto a la imagen que brinca en la escritura, ambos pensadores citan viejas formas poéticas, permitiéndoles actualizar figuraciones filosóficas, políticas y teológicas para configurar una experiencia del pensar en obra.
Entretejiendo neurociencia, ciencia cuántica y sabiduría andina: la información en ciencias de la salud desde el paradigma educativo del Allin kawsay (buen vivir)
Authors:   Universidad Nacional Mayor de San Marcos, Sarmiento Peralta Giusseppe Geraldes , Arevalo-Arevalo Carlos ,   Universidad Nacional Agraria de la Selva, Callan-Bacilio Richard ,   Universidad de Huánuco
Published: October 2024

Introducción: la educación en ciencias de la salud no es ajena a las anomalías, colapsos y tensiones propias del escenario metapandémico. Objetivos: ante ello, es necesario arribar a estrategias inéditas que nos permitan abordar eficaz e integralmente tales situaciones. En esta obra proponemos que el paradigma educativo del Allin Kawsay (Buen vivir) se conforma como una teoría de pensamiento de latentes posibilidades toda vez que representa un diálogo transdisciplinar entre la sabiduría andina y los últimos descubrimientos de las ciencias de frontera: la neurociencia y la ciencia cuántica. Métodos: para direccionar esta propuesta planteamos dos preguntas norteadoras ¿Cómo concebimos al sujeto de la educación? y ¿Cómo formarlo para alcanzar sus potencialidades? Resultados: a fin de responder estas dos preguntas iniciamos proponiendo reconceptualizar el término in-formación y luego operacionalizamos al paradigma educativo del Buen Vivir en 4 dimensiones: el Allin Yuyay (Buen pensar), el Allin Sonqoy (Buen sentir), el Allin Rimay (Buen decir) y el Allin Ruway (Buen hacer). Conclusiones: concluimos que este nuevo paradigma educativo ofrece soluciones inéditas a problemáticas sumativamente complejos y que, además, se encuentra en la capacidad de responder holísticamente a las dos preguntas de la investigación.
“Finally, Me Time!”: Korean Middle-Aged Women’s Platform Practices
Authors: Kim Eujong , Kim Yeran
Published: October 2024

This work builds on the legacy of feminist reception studies by expanding the research focus from mass media to digital platforms, particularly YouTube, and from media use to the practices of consuming and engaging with media in the context of Korean middle-aged women. The research also integrates Hartmut Rosa’s theory of resonance with the digital media environment: It suggests that while Rosa may reject digital technology in his view of resonance, digital technology, or YouTube in this case, can contribute to enhancing resonance, but only depending on how people practice it. Furthermore, our analysis highlights the importance of middle-aged women, who are not merely viewers, but rather active participants within the burgeoning YouTube scene. Lastly, we expand the current understanding of how audience groups may potentially exert agency, moving beyond the ideological binaries of submission versus resistance in the process of interpreting media texts. Our emphasis lies in the creativity embedded in Korean middle-aged women’s platform practices within their daily lives. This process is fuelled by a deep desire and will to find resonance with themselves, others, and the world.
ON ASYMPTOTIC NORMALITY OF THE KERNEL ESTIMATOR FOR NEGATIVELY DEPENDENT RANDOM VARIABLES
Authors: GNING Aminata , Mar Mouhamed , DIOUF Saliou
Published: October 2024

In this paper, we establish the asymptotic normality of the kernel estimator for negatively dependent random variables. The kernel estimator has been widely applied for independent data. However, in practice, the data are most often dependent.
Plane wave in infinite cylindrical cavity with fluid and two spherical solids
Authors:   S. P. Tymoshenko Institute of Mechanics of NAS of Ukraine, Kyiv, Ukraine, Kubenko Veniamin , Yanchevskyi Ihor ,   National Technical University of Ukraine "I. Sikorskyi Kyiv Polytechnic Institute", Kyiv, Ukraine
Published: October 2024

An analytical-numerical method for solving the stationary problem of determining the hydroacoustic characteristics of a liquid in a cylindrical cavity with two rigid spherical bodies is presented. It is assumed that a plane wave of a given frequency and amplitude propagates along the axis of the cavity. Using the principle of superposition, the method of separation of variables, translational addition theorems for special functions, the problem is reduced to an infinite system of algebraic equations, the solution of which is obtained by the truncation method. The hydrodynamic characteristics of the mechanical system depending on the frequency of the wave and its geometric parameters and the acoustic radiation forces acting on the bodies were calculated using the developed method. Numerical experiments showed that compared to a single spherical body on the axis of the cavity, the considered mechanical system has more "conditionally resonant" frequencies, at which the acoustic characteristics can exceed the amplitude of the incident wave by several orders of magnitude. At these frequencies, the radiation force function also takes its maximum value, and due to the change in frequency, bodies can both move away from each other and move towards each other. The main influence on the amplitude values of the hydrodynamic parameters is exerted by the acoustic waves reflected from the cylindrical boundary. The obtained results represent a generalization of methods for solving problems about the interaction of a plane harmonic wave with solid spherical inclusions on the axis of an infinite or semi-infinite cylindrical cavity.
Some negative results for a monotonic approximation of a function that they have a fractional derivative of a complex order
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Petrova Tamara
Published: October 2024

The issue of interpolation approximation of functions from the Sobolev class by algebraic polynomials is considered. The question of monotone approximation is the question of approximation of monotone functions from the Sobolev class by monotone polynomials. This paper investigates the issue of monotone approximation in the Sobolev space with complex index r. This work is a generalization of previously obtained results for the case of Sobolev space with a real index.
Optimal control of the systems governed by linear hyperbolic integro-differential equations
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Anikushyn Andrii , Lyashko Viktor ,   V.M. Glushkov Institute of Cybernetics, Kyiv, Ukraine, Samosonok Oleksandr ,   V.M. Glushkov Institute of Cybernetics, Kyiv, Ukraine
Published: October 2024

The work is dedicated to the study of hyperbolic integro-differential equations with partial derivatives. Integro-differential equations of this type have long been a standard object of study in applied mathematics and often arise in the investigation of processes in viscoelastic media (amorphous polymers, semicrystalline polymers, biopolymers, metals at very high temperatures, bituminous materials, etc.). The main goal is to prove the existence and uniqueness of generalized solutions to the corresponding initial-boundary value problem, as well as to investigate the existence of optimal control for systems described by these models. The main results regarding the well-posedness of the initial-boundary value problem and the existence of optimal control are obtained using the method of a priori estimates in negative norms. In particular, estimates in negative norms for the integro-differential operator in certain special spaces are obtained. By utilizing the results of S.I. Lyashko and building upon the proven a priori estimates, various definitions of generalized solutions are formulated in the work, and a result regarding their equivalence is provided. A theorem concerning the well-posedness, i.e., the existence, uniqueness, and continuous dependence of the generalized solution on the right-hand side of the equation, is presented. The work begins with a review of relevant results with similar formulations, referencing works with physical justification of the model. References to the application of the a priori estimates methodology for differential and integro-differential equations are provided. The problem statement, constraints on equation parameters, and functional spaces necessary for the investigation are described. Section 3 provides proven a priori estimates, which are a central part of the work. Section 4 contains definitions of generalized solutions and theorems describing their properties, including the well-posedness of the initial-boundary value problem. Section 5 is dedicated to the investigation of the existence of optimal control. Control is exerted through the right-hand side of the equation using a certain special operator. The work examines some examples of such control operators (illustrating various control mechanisms) and the corresponding function spaces. By utilizing proven inequalities and relying on general theorems from the theory of a priori estimates in negative norms, conditions for the existence of optimal control are established. In particular, restrictions are imposed on the admissible set of controls and the cost criterion in different scenarios.
Survey on combination of Nature Language Processing and Reinforcement Learning algorithms
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Pravosud Ruslan
Published: October 2024

The integration of NLP and RL has gained significant attention in recent years, as it holds the potential to enhance the capabilities of various applications, ranging from language understanding and generation to dialogue systems and autonomous agents. The incorporation of RL into NLP algorithms enhances language-related tasks by enabling adaptation and learning from interactions and feedback. This integration proves valuable in scenarios where language understanding and generation require dynamic and context-dependent responses, contributing to improved real-world performance. The survey explores the challenges and opportunities in fusing NLP and RL. Furthermore, it investigates the impact of different RL paradigms applications on NLP algorithms performance and combination of NLP and RL in more complex systems like simulated or real world navigation, which also includes usage of Computer Vision subsystems. In addition to reviewing existing research results, the paper identifies potential avenues for future research and development in the field.
Simulation of the fractional Brownian process with given accuracy and reliability
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Rozora Iryna , Sheptukha Yevhenii ,   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Published: October 2024

Background. Random process theory is being used more and more in various fields of science due to the high computing power of modern computers. However, it's often important to know how much we can rely on the models we use. Methods. This paper examines the modelling of the fractional Brownian motion with given accuracy and reliability. The modelling is based on Dzhaparidze and van Zanten series representation of the fractional Brownian motion. We consider the fractional Brownian motion as an input process to a time-invariant linear system with a real-valued square-integrable impulse response function, which is defined on the finite domain. Results. We prove the theorem that gives the conditions, specifically the value of the upper limit of the summing in the model, under which the obtained model approximates fractional Brownian motion with given accuracy and reliability taking into account the response of the system. Conclusions. For the proof, we use the properties of square-Gaussian stochastic processes.
Transformer model using dependency tree for paraphrase identification
Authors:   Taras Shevchenko National University of Kyiv, Kyiv, Ukraine, Vrublevskyi Vitalii
Published: October 2024

Models to represent the semantics of natural language words, sentences, and texts are key in computational linguistics and artificial intelligence. Using quality vector representations of words has revolutionized approaches to natural language processing and analysis since words are the foundation of language. The study of vector representations of sentences is also critical because they aim to capture the semantics and meanings of sentences. Improving these representations helps understand the text at a deeper level and solve various tasks. The article is devoted to solving the problem of identifying paraphrases using models based on the Transformer architecture. These models have demonstrated high efficiency in various tasks. It was investigated that their accuracy can be improved by enriching the model with additional information. Using syntactic information such as part-of-speech tags or linguistic structures can improve the model's understanding of context and sentence structure. Enriching the model this way allows you to gain a broader context and improve adaptability and performance in different natural language processing tasks, making it more versatile for different applications. As a result, a model based on the Transformer architecture using a dependency tree was proposed. Its effectiveness compared to other models of the same architecture was investigated using the task of identifying paraphrases. Improvements in accuracy and completeness over the original model (DeBERTa) were demonstrated. In the future, it is advisable to study the use of this model for other applied tasks (such as plagiarism checking and determining the author's style) and in evaluating other graph structures for sentence representation (for example, AMR graph).
A Short Version of the Authenticity in Relationships Scale: Psychometric Verification in Russian Culture
Authors: Borisova A.Y. , Nartova-Bochaver S.K.
Published: October 2024

Objective. Psychometric validation of the Russian-language short version of the Authenticity in Relationships Scale (AIRS), which allows you to assess the degree of authenticity in various contexts: partners, parents, friends and colleagues.
Background. The basis of close relationships as an absolute value for different cultures is honest self-presentation, which contributes to a person’s psychological well-being and increases satisfaction with communication. Authentic relationships include unacceptability of deception and intimate risk taking. In authentic relationships, there should be no desire to produce and maintain ideas about oneself and one’s partner that do not correspond to reality. They also imply a desire for more open, close communication, i.e., revealing one’s real self to another person. To measure this quality, the Authenticity in Relationships Scale was developed in the USA and GB, which has not yet been subjected to systematic psychometric testing, although there are no analogues to this instrument in Russia, which determined the relevance of this study. Study design. Standard psychometric validation of the methodology was carried out for each of the four contexts: partners, parents, friends, colleagues. The Cronbach coefficient alpha was analyzed on the full sample of respondents; half of the respondents’ answers were selected for exploratory factor analysis, the other half for confirmatory factor analysis.
Participants. The study involved 449 respondents aged 18 to 60 years (10% male, 90% female; average age – 27 years (min = 17, max = 60)). The study participants are Russian–speaking citizens of the Russian Federation, representatives of different professions.
Measurements. The main method was a short version of the Authenticity in Relationships Scale, which included 10 statements for each context. Data were collected online using the 1ka.si service. Jamovi (v. 2.3.21.0) was used for data processing.
Results. The scale is applicable only to the context of a romantic relationship. For other contexts, the original model has not been confirmed.
Conclusions. The methodology can be applied in research and in psychological counseling to study the authenticity level of romantic relationships. The scale's applicability to other social contexts requires further testing.
Optimizing Security and Efficiency in Fog Computing: A Trust Management System Driven by Quality Matrix
Authors: V. Thakkar Shradhdha
Published: October 2024

As fog computing emerges as a natural extension of cloud computing, its decentralized nature brings numerous advantages, such as reduced latency and enhanced Quality of Service (QoS). However, this paradigm also introduces significant security and privacy challenges, particularly when fog nodes collaborate and exchange data. In this paper, we propose a robust trust management system that evaluates both Quality of Service (QoS) and Quality of Protection (QoP) metrics from direct and indirect interactions among fog nodes. Our approach helps mitigate security risks posed by potentially malicious nodes by incorporating a predictive trust evaluation system. The proposed system reduces malicious interactions by approximately 66% and enhances response times by reducing latency by around 15 seconds. The findings demonstrate that an effective trust management system is crucial for building secure and reliable fog computing environments.