bluuebunny/crossref_metadata_2025 huggingface dataset:
Up- and Cross-selling to Repeat Customers: Empirical Evidence from Optical Retail
Authors: Nagel Niklas
Published: February 2025

By examining repeat purchases, we study the effect of customer loyalty on the ability to up-sell. Using an extensive dataset from optical retail including the sales activities of more than 410 opticians over 20 years, we track and analyze customer purchases using catalogue and invoice prices, depth of discount and gross profit. We find that the first repeat purchase results in deeper discounts and lower prices, thus decreasing the gross profit. In contrast, the subsequent repeat purchases allow retailers to up-sell customers by shifting them towards products with higher prices and profits. Additional purchases deepen the discount at a constant rate and the other variables show decreasing positive marginal effects. Finally, our results suggest that the effect of repeat purchases on discount depth varies between regular and cross-selling activities, with deeper marginal increases to discount for products sold through cross-selling.
Cambios espaciotemporales en la cobertura de la tierra y valoración ecológica de las zonas ribereñas en la microcuenca del río Ipís, Costa Rica
Authors: Solano Leitón Ricardo , Espinoza Cisneros Edgar , Chacón Madrigal Eduardo
Published: February 2025

[Introduction]: Riparian zones provide a wide range of ecosystem services, and in urban contexts with high human intervention, this provision can be especially important. However, urban riparian zones worldwide have been highly degraded. [Objective]: This research analyzed the spatiotemporal dynamics of land cover change over a period of 30 years (1992-2022) in the urban micro-basin of the Ipís River in the Greater Metropolitan Area (GAM) of Costa Rica and evaluated the ecological condition of its riparian zones. [Methodology]: This was done using geospatial techniques such as satellite image and aerial photo classification, map algebra, landscape metrics, and the use of an index for evaluating riparian ecological integrity (QBR index). [Results]: During the study period, in the Ipís River micro-basin there was a significant increase in impervious cover (66.6%) at the expense of more pervious cover with greater ecological functionality, and there has been greater fragmentation and isolation of patches of more pervious covers. The QBR index values also suggest high alteration and poor ecological integrity in the riparian zones of the micro-basin in general. [Conclusions]: The expansion of cover associated with urban uses has been prominent in the Ipís River micro-basin over the last three decades, and the high degradation in its riparian zones compromises the ability to provide ecosystem services in this context of high anthropogenic alteration.
Influencia de la educación emprendedora en las competencias emprendedoras para crear valor en una universidad pública peruana
Authors: Bermudes Mendoza Carlos Enrique , Huamanchumo Venegas Henry Ismael , Alcántara Poma Rosita Elvira
Published: February 2025

This research study aimed to determine the impact of an Entrepreneurial Education (EE) Program on the entrepreneurial competencies for value creation among students at Universidad Nacional Mayor de San Marcos (UNMSM). A quantitative experimental design was used. A survey was administered to a randomly selected sample before and after implementing the EE program. The data were analyzed using SPSS, and inferential analyses were conducted using non-parametric correlation tests based on Spearman’s rho statistic, along with the R-squared coefficient in a multiple regression analysis. The results indicated a very strong correlation between the EE program and entrepreneurial competencies for value creation. The multiple regression analysis revealed that the entrepreneurial attitude was the most significant contributor to the model, although it exhibited the least growth. In contrast, entrepreneurial aptitude demonstrated greater growth. Entrepreneurial aptitude and attitude positively affect the competencies related to creativity and innovation. This research is a valuable resource for leaders and managers of entrepreneurship centers and business incubators in public universities across the Andean region.
Gamma Radiation for Preservation: A Novel Approach to Disinfect VHS Tapes in Historical Archives
Authors: Nagai Maria Luiza Emi , Dias Djalma , Vasquez Pablo
Published: February 2025

Preserving historical artifacts, such as VHS tapes, in archival collections presents significant challenges, particularly in environments conducive to mold contamination. Inadequate control of temperature and relative humidity can promote mold growth, endangering the structural and informational integrity of these cultural assets. This study explores the application of gamma radiation treatment for the disinfection of mold-contaminated VHS tapes stored in historical archives. Utilizing the Multipurpose Gamma Irradiation Facility at the Institute of Energy and Nuclear Research (IPEN) in São Paulo, Brazil, we investigated the efficacy of gamma radiation in eradicating mold while preserving the tapes' mechanical properties and visual appearance. Despite the long-standing use of gamma ionization for decontamination since the 1960s, this research is novel in its focus on VHS tape preservation. Tensile tests and visual inspections were conducted on control, biodeteriorated, and gamma-irradiated samples. Results showed that gamma irradiation significantly improved tensile strength and strain in mold-contaminated tapes, with no observable changes in their visual appearance. This study contributes to the development of innovative preservation techniques, addressing the unique challenges posed by environmental factors in the storage of historical materials and underscoring the potential of gamma radiation as a dual-function method for disinfection and mechanical reinforcement.
ЗАЙНЯТІСТЬ У СФЕРІ ЦИФРОВИХ ПЛАТФОРМ У КОНТЕКСТІ ГІДНОЇ ПРАЦІ
Authors: ПЕРЕГУДОВА Тетяна
Published: February 2025

Досліджено такий вид працевлаштування, як платформна зайнятість, що набуває популярності у світі та в Україні. Платформну зайнятість розглянуто з позицій дотримання принципів гідної праці для формування науково-методичного базису інституціалізації нормативно-правового регулювання соціально-трудових відносин такого типу для забезпечення соціального захисту зайнятих на платформі. Розвинуто дослідження платформної зайнятості в контексті дотримання принципів гідної праці на основі визначення системи індикаторів, систематизації позитивних аспектів і соціально-економічних ризиків зайнятості в межах цифрової трудової платформи.
Результати дослідження довели певне недотримання норм гідної праці при зайнятості на платформі. Так встановлено, що заробітна плата, як правило, є нижчою за середню по Україні, зайнятість має нестабільний, а часто й неформальний характер, майже відсутні соціальне страхування й забезпечення, захист прав з боку профспілкових організацій. Це підтверджує факт притаманності платформній зайнятості ознак прекаріату, що формує певну соціальну ізоляцію зайнятих на платформі.
Стверджується, що необхідним є пошук моделі розвитку, спрямованої на мінімізацію екстрактивних ризиків у межах соціально-трудових відносин, і посилення залучення населення до трудової діяльності на принципах гідної праці. Для підвищення конкурентоспроможності української економіки вдосконалення потребує політика зайнятості в цілому, а не тільки в межах платформи, що актуалізує питання розробки стратегії політики зайнятості населення в Україні та інституціалізації політики зайнятості в контексті інклюзивного соціально-економічного розвитку. Соціальна політика має бути спрямована на мінімізацію прекарних ознак у межах платформної зайнятості, захист прав працівників і дотримання соціальних гарантій.
ЕКСПЕРИМЕНТАЛЬНЕ ДОСЛІДЖЕННЯ ПОДАТЛИВОСТІ ФЛАНЦЕВИХ З’ЄДНАНЬ У МОДЕЛІ МАНІПУЛЯТОРА КОСМІЧНОГО ПРИЗНАЧЕННЯ
Authors: Бейцун B.C. , Дзюба А.П.
Published: February 2025

В поданій роботі представлені результати експериментальних досліджень пружних податливостей шарнірних вузлів багатоланкових маніпуляторів спеціального призначення, направлених на побудову технології, що забезпечує зниження узагальнених переміщень кінцевої ланки консольного маніпулятора. Проведено дослідження податливості фланцевих з’єднань при дії згинання, кручення та розтягу-стиску. Результати подані у вигляді схем виконання експериментів, графіків залежності податливості від навантажень та відповідних порівнянь. На основі отриманої сукупності результатів було встановлено вплив податливості фланцевого з’єднання на моделювання динаміки робочих процесів пружних маніпуляторних конструкцій, зокрема з’єднувального вузла космічного маніпулятора, призначеного для керування розташуванням у просторі спеціального обладнання. Отримані результати можуть бути корисними для розробки маніпуляторів в робототехніці, мікроелектроніці, космічних дослідженнях та інших галузях
ДО АНАЛІЗУ НЕЛІНІЙНИХ КОЛИВАНЬ ПОЛОГИХ ОБОЛОНОК ІЗ ФУНКЦІОНАЛЬНО-ГРАДІЄНТНИХ МАТЕРІАЛІВ ЗІ ЗМІННИМИ У ЧАСІ ПАРАМЕТРАМИ ЗА НАЯВНОСТІ ЛОКАЛІЗОВАНОГО ЗБУРЕННЯ
Authors: Грищак В. З. , Руденко Д. О.
Published: February 2025

Запропоновано наближений аналітичний розв’язок задачі нелінійної динаміки пологих оболонок із функціонально-градієнтних матеріалів зі змінними у часі параметрами з урахуванням впливу зовнішнього локалізованого періодичного динамічного навантаження
КРУЧЕННЯ З РОЗТЯГОМ ПРУЖНО - ПЛАСТИЧНОГО БРУСА
Authors: Панін К. В.
Published: February 2025

Розглядається задача про визначення напружено-деформованого стану пружно-пластичного бруса сталого однозв’язного поперечного перерізу, який зазнає послідовного кручення та розтягу. Для опису складного навантаження матеріалу бруса використовується теорія пластичності, що враховує мікродеформації (Новожилова, Кадашевіча, Чернякова). Задача розв’язується за допомогою напівзворотного методу, а також методу скінченних елементів. Досліджено вплив історії навантаження на вигляд пластичних зон у перерізі бруса.
SOME PROBLEMS FOR TRANSVERSALY ISOTROPIC SPACE WITH PERIODIC CRACK SYSTEMS
Authors: Ніколаєв О. Г. , Крайниченко А. С.
Published: February 2025

The stress state of a transversely isotropic space with periodic systems of flat circular cracks whose centers are on the axis of anisotropy, and their planes are perpendicular to it, is studied. Each periodic system is defined by a representative layer whose planes are perpendicular to the axis of anisotropy, and which contains a finite system of cracks of various sizes. All problems were solved by the generalized Fourier method. The results of the research were based on a wide computer experiment, within which stress distributions and stress intensity factors were calculated not only in periodic problems, but also in non-periodic problems formed by several representative layers.
ВИДАТНИЙ ВЧЕНИЙ, ЛЕГЕНДАРНИЙ РЕКТОР, БАГАТОГРАННА ОСОБИСТІСТЬ
Authors: Дзюба А. П.
Published: February 2025

до 105 річчя від дня народження доктора фізико-математичних наук, професора, академіка Володимира Івановича Моссаковськог (27.08.1919 – 13.07.2006)
Influence of Depression on the Academic Achievement of Undergraduate Students of Federal College of Education, Pankshin, Plateau State: Counselling Implications
Authors:   Department of Educational Psychology, Federal college of Education, Pankshin, Dakas Nandak James , Daudu Nelly Kanayo ,   Department of Educational Psychology, Federal college of Education, Pankshin
Published: February 2025

The study investigated Influence of Depression on the Academic Achievement of Undergraduate Students of Federal College of Education, Pankshin, Plateau State: Counselling Implications. It raised four objectives and four research questions as well as five hypotheses guided the study. The research design adopted for the study was the Survey Design. The population of the study was the entire undergraduate students in the Department of School of Education, Federal College of Education, Pankshin whose number is while the sample was 196. The instrument used for the study was a structured questioned self-developed by the researcher; validated by experts in counselling psychology and test and measurement and Educational Psychology, University of Jos with a reliability coefficient of 0.80. The findings revealed that students have been having sleep disturbances, including waking up in the night, and not being able to concentrate in academic activities and that they do get tired and lack energy in small academic tasks; most students have faced depression due to stressful experience of trying to balance social life and class work, uncertainty about money, leaving their family, poor sleep habit, alcohol and drug abuse, eating disorder and socialization problems. Counselling through the provisions of options of developing coping skills could go a long way to help depressed individuals; that counsellors during counselling sessions offer options which are therapeutic in nature, such as regular exercise, getting enough sleep and spending quality time with people: friends, family members, to mention a few which could go a long way to help depressed people (students) overcome their depression. Recommendations were drawn and suggestions for further study.
El impulso originario de Eros en la teoría del deseo de Jacques Lacan
Authors: González-Fernández Cristina
Published: February 2025

El objetivo de este ensayo es mostrar que no es la pulsión freudiana, sino la concepción del deseo como falta propuesta por Lacan, la que se corresponde a la interpretación filosófica del personaje mítico de Eros. A través del análisis de la causa, meta y flujo del deseo, será posible encontrar ese impulso primigenio representante de la batalla de la vida contra la muerte, del empuje de lo Real contra lo Simbólico.
Apresentação
Authors: Elaine Gomes Vilela
Published: February 2025

Apresentação da edição de 2024.
FORMAÇÃO CONTINUADA DE PROFESSORES NO AMBIENTE ESCOLAR PARA O DESENVOLVIMENTO DA METODOLOGIA DE EXPERIMENTAÇÃO INVESTIGATIVA NO ENSINO DE CIÊNCIAS NA EDUCAÇÃO
Authors: Jappe Goi Mara Elizângela , Pereira Neves Gonçalves Raquel
Published: February 2025

Este trabalho busca apresentar parte dos resultados de uma pesquisa de doutorado sobre o aprofundamento teórico e produção de Experimentos Investigativos com professores de Ciências da Natureza do Ensino Fundamental e professores do Ensino Médio, Licenciandos em Ciências da Natureza e Pedagogia. As formações foram realizadas de forma híbrida com o uso da plataforma Google Meet e da implementação nos contextos escolares. O curso ocorreu no primeiro semestre de 2023 com encontros síncronos e assíncronos. Durante a formação, os professores aprofundaram seus conhecimentos sobre aspectos psicológicos, pedagógicos e epistemológicos da Experimentação Investigativa no Ensino de Ciências, elaboraram e aplicaram experimentos nas suas aulas na Educação Básica. Após a aplicação, em grupo de formação os resultados foram socializados e debatidos. Os dados desta pesquisa foram analisados de forma qualitativa e foram produzidos durante os encontros e das apresentações em plenárias sobre as aplicações dos experimentos. Como resultado aponta-se que a pesquisa pode trazer contribuições para a formação dos professores participantes da formação, transformando as suas metodologias de ensino no dia a dia da escola. Os Experimentos Investigativos elaborados e aplicados pelos professores foram analisados a partir de categorias a priori, sendo elas: (1) Etapa da Educação Básica para a qual o Experimento foi elaborado; (2) Questões elaboradas pelos professores para a ficha de acompanhamento; (3) Dificuldades apontadas pelos professores para a elaboração dos Experimentos Investigativos; (4) Tipos de plenárias para a apresentação dos Experimentos Investigativos. A análise mostrou que foram elaborados quatro experimentos para a Educação Infantil, um experimento para os Anos Iniciais para o Ensino Fundamental, cinco experimentos para Anos Finais do Ensino Fundamental e dois experimentos para o Ensino Médio. Após as apresentações em plenária sobre a experiência realizada pode-se perceber por meio dos relatos dos professores em formação que o uso da metodologia de Experimentação Investigativa foi positivo para o processo de aprendizagem dos alunos e tem potencial para ser aplicada no contexto escolar.
Can Environmental Protection Tax Reform Promote Green Comprehensive Efficiency Productivity? Evidence from China’s Provincial Panel Data
Authors:   Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation, Chenghao Ye , Mayburov Igor A. ,   Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation,   Financial University under the Government of the Russian Federation, Moscow, Russian Federation, Hongjie Gao ,   Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation
Published: February 2025

This study is based on China’s provincial panel data from 2013 to 2022, using the Super-SBM and Difference-in-Difference (DID) Model, combined with SPSSAU online statistical calculator, Stata18.0 and Python3.12 software for econometric analysis, to explore the impact of environmental protection tax reform (EPTR) on provincial green comprehensive efficiency productivity (GCEP) and its internal mechanism. To ensure the rigor of the research, the GCEP measurement index based on the Super-SBM Model was first constructed. Furthermore, the mediating effect model is used to test the role of electricity productivity in the impact of EPTR. The empirical results show that the implementation of EPTR has significantly improved the GCEP of the pilot areas, and this improvement effect shows a trend of gradual and significant enhancement in the later stage of the policy implementation. The GCEP analysis by region shows that the GCEP is higher in the eastern and coastal provinces, while the GCEP is relatively lower in the central and western regions. When the measurement method of core variables is changed and the variable analysis of independent years is carried out, the robust results support the core conclusion that the environmental protection tax reform has a positive impact on GCEP. The mechanism analysis shows that there is a positive correlation between EPTR and regional power generation, and a negative correlation between power generation and GCEP. This study not only provides a scientific basis for the evaluation of EPTR, but also provides a reference for other countries to explore the policy design of market-based means to promote green development.
Marine heatwaves and changes in macroalgae richness and composition from Antarctic Peninsula and South Shetland Islands: concise review
Authors: PELLIZZARI FRANCIANE M. , SANTOS KEVLYN CAROLINE , OSAKI SAYURI , ROSA LUIZ H.
Published: February 2025

Abstract The emerging global events of Marine Heatwaves (MHW), including those in Antarctica, are generally caused by large-scale meteorological and oceanographic changes responsible for rapid warming, but with lasting consequences in marine communities worldwide. Several abiotic features, such as surface seawater temperature (SST), salinity, pH, nutrients, and ice dynamic limit the reproduction, growth and distribution of macroalgae, which are sensitive to abrupt oscillations in these features resulting in changes in polar assemblages. This review compiled and related MHWs spatial data from South Shetland Islands (SSI), Eastern and Western Antarctic Peninsula (EAP/WAP), discussing seaweed assemblages possible responses on composition, distribution and richness, as well species expansion and retreat. Additionally, we present an updated and compiled checklist of macroalgal taxa from the WAP. The present data showed a clear enhance in MHWs events in SSI, when compared to EAP and WAP. Also, this coincides with the increase in richness and distributional changes of seaweed assemblages along the SSI, in the last decade. Changes in these marine sentinel assemblages constitute a warning to the Antarctic biota. Besides, the present review expands current polar knowledge and detects gaps in Antarctic phycological conservation studies and their connections facing climate change.
Inflexões e crise da política econômica: 1974-1980
Authors: COUTINHO LUCIANO G.
Published: February 2025

RESUMO Este artigo reconstrói a política econômica implementada pelo governo brasileiro entre 1974 e 1980, analisando os diferentes subperíodos ao longo do caminho e com foco especial nas tentativas de equilibrar o crescimento econômico, a dívida e o controle da inflação.
“Trabalho produtivo e excedente”, segundo Paul Singer: um comentário
Authors: LIMA JOÃO HERALDO
Published: February 2025

RESUMO Esta é uma resposta ao artigo de P. Singer “Trabalho produtivo e excedente” publicado nesta revista, volume 1, número 1 e expande o tópico de como Marx tratou o trabalho produtivo e improdutivo ao longo de sua obra e tenta repreender a ideia do Professor Singer de uma contradição na explicação de Marx.
Análise macroeconômica: uma introdução metodológica
Authors: BACHA EDMAR LISBOA
Published: February 2025

RESUMO O autor lançará em breve um novo livro “Análise Macroecônomica: Uma Perspectiva Brasileira” com foco na análise macroeconômica de economias semi-industrializadas, como a brasileira. Esta nota reflete as opções metodológicas utilizadas na escrita do livro.
Despesas do Estado, repartição e valor
Authors: BRESSER-PEREIRA LUIZ CARLOS
Published: February 2025

RESUMO o escopo atual do Estado é de um papel ampliado, com maior produção de bens e serviços. No entanto, além de produtor, o Estado é também distribuidor e coordenador do sistema econômico. Este artigo tem como objetivo investigar esse novo escopo do aparato estatal e como as teorias econômicas atuais são insuficientes para compreendê-lo corretamente.
Entrevista com Lauro Frederico Barbosa da Silveira
Authors: Silveira Lauro Frederico Barbosa da , Alves Marcos Antonio
Published: February 2025

Resumo: Publicamos a entrevista realizada em 2017 com o professor Lauro Frederico Barbosa da Silveira. A republicação é uma homenagem póstuma a este que foi um dos fundadores da Revista Trans/Form/Ação, há 50 anos. Profundo conhecedor de diversos temas em Filosofia e outras áreas, Lauro foi pioneiro nos estudos em Semiótica no Brasil, tendo contribuído para a consolidação e divulgação na área. A entrevista trata de diversos assuntos, como a origem, formação acadêmica e profissional do entrevistado, o papel da semiótica, do filósofo e da filosofia no mundo, a inseparabilidade entre teoria e prática, o cenário político brasileiro, o papel da informação e dos meios de comunicação na formação de hábitos, da ação autônoma, a função das emoções na produção de teorias.
Evaluation of the contemporary aesthetic education value of Chinese classical dance education thought
Authors: Qi Wen , Ma Yunxia
Published: February 2025

Abstract: Chinese classical dance education has a profound impact on contemporary aesthetic education. Its educational philosophy of “neutralization” and “twin” can provide a unique value perspective and practical path for modern aesthetic education. This paper explores the aesthetic education concept of Chinese classical dance and its educational value in contemporary society, aiming to improve the individuals’ moral quality and humanistic one through dance education. Starting from analyzing the origin, development and vitality of Chinese classical dance, this paper explores its aesthetic education concept and its contemporary aesthetic value from the perspectives of dance education, harmony, cultivation, and integrated education. The study believes that bridging the gap between Chinese traditional dance education concepts and contemporary aesthetic education, and combining classical dance philosophy with modern dance practice, can greatly improve the aesthetic education level of modern dance. Integrating philosophical reflection into dance research can deepen the understanding of the cultural significance and aesthetic value of dance.
The critique and transcendence of universal values through the humanity’s common values: a theoretical investigation on Marx’s thought on personal freedom
Authors: Wang Yun , Liu Wenyu , Li Peng
Published: February 2025

Abstract: The concepts of “universal values” and “common values of all humanity” are often confused. Existing literature has examined the distinction between these two concepts within the philosophical domains of ontology, methodology, epistemology, historical perspectives and ethics. The innovation of this paper lies in its analysis from a more micro-level perspective, focusing on the concept of “individual freedom”. Marx’s notion of “personal freedom” is characterized as “concrete freedom,” referring to the “real individual” as historical, social and relational. In contrast, the liberal philosophers’ concept of “personal freedom” is seen as “abstract freedom,” where the individual is regarded as innate, natural and independent. Marx delved into the realm of material production, focusing on the individual’s labor and the relations of production. He advocated for the abolition of alienated labor, aiming for a society where, in a communist system, each person could achieve free and comprehensive development. The disparities in these notions of “personal freedom” reflect the fundamental distinctions between Marx’s “common values for all humanity” and Western “universal values”.
Influence of alkali treatment on physical-mechanical properties of mallow fiber/BOPP composites
Authors: Litaiff Hannah Alagoas , Santos Gabrielle Machado dos , Melo Gabriel de , Cunha Claudia da , Giacon Virginia Mansanares
Published: February 2025

Abstract This study investigated the impact of alkaline treatment on mallow fibers used as reinforcement in bi-axially oriented polypropylene (BOPP) waste composites. Fibers were treated with a 5% NaOH solution and characterized by XRD, FTIR, TGA, and tensile testing. Composites were fabricated with both untreated and treated fibers, and their physical, thermal, morphological, and mechanical properties were evaluated. XRD analysis revealed an increase in crystallinity index after treatment, correlating with enhanced breaking stress in treated fibers. Composites with treated fibers exhibited significantly reduced thickness swelling and water absorption, indicating improved fiber-matrix compatibility. SEM micrographs confirmed enhanced fiber-matrix adhesion in composites using treated fibers. Overall, the results demonstrate that alkali treatment significantly improves the properties of mallow fiber/BOPP composites, promoting their use as sustainable and eco-friendly materials. This research highlights the potential of valorizing agricultural waste and recycled plastics for the development of high-performance composites.
Avaliação da resistência à corrosão da interface de carboneto de vanádio desenvolvida através da termodifusão e por laser cladding
Authors: Santos Lucas Ribeiro dos , Damm Djoille Denner , Barreto Lhaira Souza , Barquete Danilo Maciel , Corat Evaldo José , Capelossi Vera Rosa
Published: February 2025

RESUMO O processo de corrosão nos metais compromete a estrutura e o funcionamento de diversos materiais utilizados no cotidiano. Revestimentos e modificações superficiais que retardem a evolução do processo corrosivo são os métodos de proteção mais utilizados. Os revestimentos termodifundidos de carboneto de vanádio foram desenvolvidos para melhorar o desempenho e a vida útil de ferramentas de aço para conformação plástica de metais. Neste trabalho avaliou-se a resistência à corrosão de revestimentos de carboneto de vanádio termodifundidos e aplicados por laser cladding sobre o aço ferramenta AISI D2. Os revestimentos foram caracterizados quimicamente por difração de Raios X. Para avaliar a resistência à corrosão utilizou-se técnicas eletroquímicas, como a espectroscopia de impedância eletroquímica (EIS) e, a análise da microestrutura foi realizada por microscopia eletrônica de varredura com sonda. Os resultados dos ensaios eletroquímicos mostraram que a camada de carboneto de vanádio pelo processo de laser cladding do aço AISI D2 apresentou resultado significativo à resistência à corrosão. No processamento via laser, a fusão, convecção e solidificação do pó de carboneto de vanádio (VC) e da superfície do substrato fazem com que o cromo presente no substrato seja distribuído uniformemente não só na camada de carboneto de vanádio por laser cladding (VCLC) como na região logo abaixo, na zona térmica afetada (ZTA) pelo aquecimento. A resistência a corrosão foi observada nas análises feitas por microscopia eletrônica de varredura quanto à homogeneidade da camada. As análises por dispersão de raios X (EDS) e por difração de raios X (DRX) apresentaram teores do elemento ferro em níveis reduzidos, adequados para a boa resistência à corrosão.
Comparative analysis of nanoparticle-based nanofluids in heat pipes: enhancing thermal conductivity with graphene oxide, copper oxide, iron oxide, and titanium oxide
Authors: Nallusamy Radhakrishnan , Rathinasamy Senthilkumar
Published: February 2025

ABSTRACT A heat pipe with low thermal resistance and high thermal conductance is one of the most effective heat transfer devices. It can move large amounts of heat over a small cross-sectional area with extremely little temperature variations between the two temperature limits. This study uses Design of Expert software to evaluate the performance of various nanofluids as the working fluid for the heat pipe, including copper oxide, graphene oxide, iron oxide, and titanium oxide. The base fluid used in this analysis is an aqueous solution of n-Octanol. The parameters considered in this analysis are the condenser flow rate, filling ratio, angle of inclination, and heat input. In order to assess the thermal efficiency of the heat pipe's working fluids, all operational factors are assessed using the Central Composite Design (CCD) matrix and Response Surface Methodology during experiment design. The experimental findings demonstrate that the suggested model can predict the heat pipe's thermal efficiency to within 1% of the variation. As a result, the suggested model can be used to forecast the heat pipe's thermal efficiency.
Experimental investigation on development and machinability of copper matrix hybrid composite – graphene and SiC / TiC / ZrO2 / AlMg reinforcements
Authors: Asaithambi Vembathurajesh , Chandrasekar Mathalai Sundaram
Published: February 2025

ABSTRACT A copper – graphene base composite is developed with different hard particle reinforcements through the powder metallurgy process. The different reinforcement particles are silicon carbide (SiC), titanium carbide (TiC), zirconium oxide (ZrO2) and aluminum – magnesium (AlMg) at equal weight percentages. The spherical copper powder with irregular reinforcement particles got pressed during the powder compaction and deformed to form a strong structure. During sintering the powder compaction has undergone metallurgical diffusion and the bonding between the reinforcement and matrix material. The microstructure of the pure copper and the copper – graphene with different reinforcement is compared for discussion. The hardness of copper and copper – graphene – titanium carbide composite is maximum and similar in results. The density of copper – graphene – titanium carbide composite is two-fold harder than the copper – graphene – aluminum magnesium composite material. Subsequently the porosity of the AlMg reinforcement is less as the diffusivity is higher than the other reinforcements.
Advances in lightweight concrete: balancing strength and workability
Authors: Dharmaraj Sri Ruban , Thomas Naveen Santhana , Kachancheeri Muhammed Shameem , Dyson Charles , Murugan Amutha , Rajendran Eswari
Published: February 2025

ABSTRACT This study investigates how the workability and mechanical qualities of concrete are affected by adding different amounts of Ordinary Portland Cement (OPC), Ground Granulated Blast Furnace Slag (GGBS), Fine Aggregate (FA), Coarse Aggregate (CA), and Lightweight Expanded Clay Aggregate (LECA). Traditional coarse aggregates were replaced with GGBS ranging from 5% to 20% and LECA included at varying degrees in a range of concrete mixtures. Slump, L-box, V-funnel, J-ring, and U-box tests were used to evaluate workability, while tests for compressive strength, split tensile strength, and flexural strength were used to evaluate mechanical characteristics at 7, 14, and 28 days. The results showed that workability and compressive strength increased with increasing GGBS concentration, with 15% GGBS achieving a maximum of 68.34 MPa. However, higher proportions of LECA negatively impacted mechanical strength. The optimal mix comprised 85% OPC, 15% GGBS, and a balanced LECA content, achieving enhanced workability without compromising strength. This research highlights the potential for sustainable concrete production by utilizing waste materials while ensuring structural integrity.
Efectividad de la intervención e-share para cuidadores de personas mayores después de accidente cerebrovascular: ensayo pragmático aleatorizado
Authors: Costa Francine Melo da , Canto Débora Francisco do , Paskulin Lisiane Manganelli Girardi
Published: February 2025

Objetivo analizar la efectividad de una intervención educativa virtual para cuidadores familiares en la sobrecarga y en la capacidad de cuidar a personas mayores después de un accidente cerebrovascular. Método ensayo pragmático aleatorizado con 58 cuidadores de personas mayores sobrevivientes de accidente cerebrovascular. El grupo de intervención recibió acceso a un curso en línea para la educación de los cuidadores. La capacitación del cuidador fue evaluada mediante la Escala de Capacidades del Cuidador Informal de Ancianos Dependientes por Accidente Cerebrovascular y la sobrecarga mediante la Caregiver Burden Scale antes y tres meses después del alta hospitalaria, ambas adaptadas y validadas para uso en Brasil. Se adoptó el modelo de Ecuaciones de Estimaciones Generalizadas complementado por el Least Significant Difference Resultados la muestra fue homogénea y los grupos difirieron estadísticamente solo en relación con el parentesco (p=0,034), observándose una mayor proporción de hijos en el grupo control. Hubo un efecto de la intervención en la mejora de la administración de medicamentos (p=0,006) y en la reducción de la decepción (p=0,011) en el grupo de intervención. Conclusión la intervención favoreció a los cuidadores que la recibieron en cuanto a la mejora de la administración de medicamentos y la reducción de la decepción. Este es el primer estudio en Brasil que propone el uso de tecnologías educativas digitales para este grupo, representando un importante avance en Enfermería. Registro clinicaltrial.gov: NCT05553340.
Effectiveness of e-share intervention for caregivers of elderly people after stroke: a pragmatic randomized trial
Authors: Costa Francine Melo da , Canto Débora Francisco do , Paskulin Lisiane Manganelli Girardi
Published: February 2025

Objective to analyse the effectiveness of a virtual educational intervention for family caregivers on the burden and ability to care for elderly people after stroke. Method randomized pragmatic trial with 58 caregivers of elderly survivors of stroke. The intervention group received access to an online course for caregiver education. Caregiver training was assessed using the Scale of Capabilities of Informal Caregivers for Dependent Elderly People due to Stroke and burden through the Caregiver Burden Scale before and three months after hospital discharge, both adapted and validated for use in Brazil. The Generalized Estimating Equations model complemented by the Least Significant Difference was adopted. Results the sample was homogeneous and the groups differed statistically only in relation to kinship (p=0.034), with a higher proportion of children observed in the control group. There was an effect of the intervention on improving medication administration (p=0.006) and reducing disappointment (p=0.011) in the intervention group. Conclusion the intervention benefited the caregivers who received it in terms of improving medication administration and reducing disappointment. This is the first study in Brazil that proposes the use of digital educational technologies for this group, representing an important advance in Nursing. Clinicaltrial.gov registration: NCT05553340.
Simulación clínica sobre violencia de pareja en mujeres adolescentes: aportaciones a la enseñanza en salud
Authors: Baragatti Daniella Yamada , Scotto Leticia da Silva , Alves Claudia Adão , Soares Ana Paula de Miranda Araújo , Girão Fernanda Berchelli , Carlos Diene Monique
Published: February 2025

Objetivo conocer las contribuciones del uso de la simulación clínica en la atención a mujeres adolescentes en situación de violencia de pareja en el contexto de la Atención Primaria de Salud. Método estudio cualitativo con 30 estudiantes de pregrado de medicina y 28 de enfermería de una universidad pública de Brasil. La recogida de datos fue mediada por un debriefing holístico, con posterior análisis temático reflexivo e inductivo. Resultados surgieron dos temas: la complejidad de la violencia y las competencias desarrolladas mediante el uso de la simulación. Los estudiantes plantearon la complejidad de la atención debido a los aspectos familiares, las particularidades de la población, la ambivalencia de sentimientos en una relación violenta y el límite entre preservar la autonomía y la obligación de denunciar. Se desarrollaron y practicaron diversas habilidades, como las de mediación de conflictos, respeto, vinculación, acogida y reconocimiento de la red de apoyo. Conclusión el uso de la simulación demostró ser una herramienta poderosa para el proceso de enseñanza-aprendizaje en cursos de pregrado, ya que permitió reflexionar sobre las especificidades de la atención a adolescentes. El abordaje cualitativo del proceso también permitió profundizar en cómo esta estrategia puede ser coherente con temas complejos que involucran la adquisición y experimentación de competencias cognitivas, procedimentales y actitudinales.
Oral anticancer promising of hexadecanoic acid through melecular interaction to nuclear factor-kappa-B p65/RELA and tumor suppressor-p53
Authors: Mufidah N. , Muzari K. , Budi H. S. , Indrawati R. , Anitasari S. , Shen Y.K. , Umarudin U.
Published: February 2025

Abstract Ambonese banana stem extract (Musa paradisiaca var. sapientum (L.) Kuntze) has been proven to contain the active compound Hexadecanoic acid (Hexa) which can suppress the growth of cancer cells through the apoptosis process. The aims to determine HA interaction to nuclear factor-kappa-B p65/RELA and tumor suppressor-p53 for the development of oral anticancer drugs through molecular docking. In silico molecular docking study carried out include prediction of activity spectra of substances (PASS), drug-likeness analysis based on the lipinski rule of five principles, absorption, distribution, metabolism, excretion, and toxicity (ADMET) study, molecular docking and Hexa bond visualization (CID: 985), along with the positive control comparison 5-fluorouracil (Fluo) (CID: 3385) and the derivative compound 9-octadecenoic acid (Octa) (CID: 445639) which bind to the proteins target RELA (PDB ID: 6NV2) and p53 (PDB ID: 2OCJ). The Hexa, Fluo and Octa compounds' tests were negative for AMES toxicity, indicating that these compounds do not cause genetic mutations. The acute oral toxicity tests yielded values of 1.44 mol/kg for Hexa, 1.939 mol/kg for Fluo and 1.417 mol/kg for Octa. Molecular docking results and bond visualization indicate that the affinity of 9-octadecenoic acid interacts better with RELA and p53 compared to the positive control, i.e. 5-fluorouracil. Hexa compound exhibits a superior binding pocket compared to Fluo and Octa, particularly against the p53 target protein. Hexadecanoic acid compound in Musa paradisiaca var. sapientum (L.) Kuntze represents a breakthrough in developing a new anticancer potential and effectiveness against RELA and p53.
Invasiveness in Schefflera s.l.: do non-native species outperform phylogenetically related native species?
Authors: Carmes Amanda Angélica , Sühs Rafael Barbizan , Fiaschi Pedro , Dechoum Michele S.
Published: February 2025

Abstract: Can differences in biological attributes related to seed germination and seedling development between phylogenetically close native species and invasive non-native species help explain biological invasion potential in subtropical forests? Can the expression of these attributes vary according to different conditions of light when assessed experimentally? To answer these questions, we collected seeds of four phylogenetically close species, two of which are native (Didymopanax angustissimus Marchal and Didymopanax calvus (Cham.) Decne. & Planch.) and the other two are invasive non-native species (Heptapleurum actinophyllum (Endl.) Lowry & G.M. Plunkett, Heptapleurum arboricola Hayata) on coastal regions of southern Brazil. The seeds were set to germinate under different light conditions (100% and 50%) for a period of 180 days. We compared seed germination, seedling survival and growth between the native and invasive non-native species. H. actinophyllum showed higher proportions of germinated seeds, compared to the native D. calvus in T100. The native D. angustissimus showed higher Index of Velocity of Germination (IVG), compared to invasive non-native H. arboricola in the T50. The rate of survival of the invasive non-native species was higher at 50% of light. The higher germination proportion of the invasive non-native species help to explain their invasiveness regardless of light intensity. Our results suggest potential plasticity in H. arboricola for root/shoot biomass allocation under different light availability conditions. Both invasive non-native species are shade-tolerant, allowing them to germinate in the forest undergrowth. This trait may contribute to their establishment and invasion success in forests. Thus, both H. actinophyllum and H. arboricola should be considered a threat to closed canopy forests.
OCORRÊNCIA DE CALOPTILIA AZALEELLA (BRANTS, 1913) EM RHODODENDRON INDICUM (L.) SWEET
Authors: Rodrigues Netto S.M. , Bergmann E.C. , Imenes S.D.L.
Published: February 2025

RESUMO O trabalho relata a primeira ocorrência da traça Caloptilia azaleella (Brants, 1913) (Lepidoptera:Gracillaridae) no Brasil. A praga foi encontrada em plantas de Rhododendron indicum (L.) Sweet (Ericaceae), nas variações sulferina e branca, nas cidades de São Paulo (SP), Joinville (SC) e Ubatuba (SP). São citados dados biológicos obtidos em laboratório e descritos os danos ocasionados.
CARACTERIZAÇÃO DE LINHAGENS CELULARES: I - IDENTIFICAÇÃO DE ESPÉCIES POR ANÁLISE ISOENZIMÁTICA
Authors: Fernandes M. J. B. , Simoni I. C.
Published: February 2025

RESUMO A confirmação da espécie de 10 linhagens celulares, pertencentes a 6 espécies animais, foi feita através da análise das isoenzimas da lactato desidrogenase (LDH) e da glicose-6-fosfato desidrogenase (G-6-PD). Todas as linhagens celulares exibiram uma única banda de G-6-PD. As cinco bandas de LDH foram obtidas nas linhagens celulares de origem suína, bovina e símia; quatro nas de leporina e equina; e uma banda nas de hamster. As células de diferentes espécies animais puderam ser distinguidas uma das outras através dos padrões comparativos das isoenzimas da G-6-PD e LDH.
FLUTUAÇÃO POPULACIONAL DE OPOGONA SACCHARI BOJER, 1856, EM CULTURA DE DRACENA (DRACAENA FRAGANS MASSANGEANA)
Authors: Bergmann E.C. , Imenes S.D.L. , Campos T.B. de , Romanholi R. de C. , Terra M. de P.
Published: February 2025

RESUMO Com o objetivo de definir os períodos de maior ocorrência edeterminar os graus de infestação de Opogona sacchari em cultura de dracena, instalou-se experimento no município de Juquiá, SP, durante o período de maio de 1993 adezembro de 1994. Através de avaliações quinzenais foram coletadas 699 lagartas e 404 pupas, determinando-se curvas de flutuação com vários picos durante o período. A avaliação de danos determinou que 59% das plantas apresentaram sintomas, sendo 61% destes, iniciais.
Aplicativos móveis de pré-natal relatados na literatura científica: uma revisão de escopo
Authors: Chaves Arlane Silva Carvalho , Silva Jhonata Gabriel Moura , Jesus Layane Mota de Souza de , Spiri Wilza Carla , Jensen Rodrigo
Published: February 2025

RESUMO Objetivo: Mapear os aplicativos móveis de pré-natal descritos e/ou avaliados na literatura científica. Métodos: Revisão de escopo, a partir das recomendações da JBI, com recorte temporal de 2017 a 2022. As buscas foram realizadas em outubro/2023 nas bases/portais Lilacs via BVS, Web of Science, MEDLINE, Cochrane Database of Systematic Reviews, Scopus, CINAHL e Banco de Teses e Dissertações da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). Resultados: Foram analisados 49 estudos, sendo 45 artigos, três dissertações e uma tese, publicados em português e inglês. Os aplicativos possuem finalidade para educação em saúde/autocuidado (46,9%), monitoramento clínico (28,5%), para uso por profissionais de saúde (16,3%), pesquisa/coleta de dados (6,1%) e ensino profissional (2%). Conclusão: Os aplicativos descritos e/ou avaliados nos estudos são diversos em suas finalidades e público e confirmam a inserção da tecnologia móvel no cuidado e monitoramento em saúde das gestantes.
Chromen Derivatives: A Detailed Experimental and Theoretical Investigation as Corrosion Inhibitors For Mild Steel in HCL 1M
Authors: Larioui A. , Chaouki I. , Hamouche F. , El Amri A. , Errahmany N. , El Hajri F. , El Hamzi S. , Dkhireche N. , El Bakkali S. , Boukhris S.
Published: February 2025

Corrosion of metals poses a significant threat to the economy, environment, and public health due to its harmful effects and the production of contaminated materials. Corrosion inhibitors are crucial in protecting metallic substances, especially in harsh environments. This research investigated the corrosion inhibitory properties of two novel chromen-6-one (BCC) derivatives named BBC-4-Cl and BBC-4-CH3 in 1 M hydrochloric acid solution. The electrochemical characteristics of these two heterocyclic compounds were evaluated using electrochemical tests, SEM and EDX surface characterization analyses, and theoretical studies using a multiscale computational approach (including DFT, MCS, FFV, and RDF). The electrochemical data revealed that BBC-4-Cl and BBC-4-CH3 acted as mixed-type corrosion inhibitors. We found that the effectiveness of these inhibitors was directly proportional to their concentration, with higher concentrations leading to a significant increase in effectiveness. This was reflected in a reduction in corrosion current and increased polarization resistance. The effectiveness reached 76% and 89% at 298 K in 10-3 M BCC-4-Cl and BCC-4-CH3, respectively. The results suggested a strong adsorption of the molecules on the surface indicating a chemisorption process. Surface analyses confirmed the formation of a protective layer on the steel surface, and the theoretical study confirmed these results.