In this paper, we investigate the interactions of the Dirac oscillator in the context of global monopoles, focusing on the effects of fermionic fields in curved space–time. By analyzing the Dirac equation and employing a partition function, we derive essential thermodynamic properties such as Helmholtz free energy, average energy, entropy and heat capacity. The results reveal that variations in the topological defect parameter and angular frequency significantly influence these properties, affecting both energy levels and information measures in position and momentum spaces. This research highlights the intricate relationship between thermodynamic behavior and quantum information, paving the way for further exploration in quantum computing applications.
Este artigo tem como objetivo compreender as experiências educativas vivenciadas pela população negra na Vila Raposa, em Matão-SP, a partir das memórias de moradores e de pessoas que, em diferentes momentos de suas vidas, tiveram vínculos com o território. Busca-se, nesse sentido, analisar as relações entre memória, educação, pertencimento étnico-racial e condição social, considerando as experiências e os significados atribuídos pelos sujeitos às suas trajetórias. A investigação parte do reconhecimento de que a história da educação não se limita às instituições escolares oficialmente constituídas, podendo também ser reconstruída por meio de práticas comunitárias, iniciativas familiares e experiências de escolarização pouco registradas pela documentação institucional. De abordagem qualitativa, a pesquisa envolve entrevistas, registros documentais e observação de construções que permanecem no espaço estudado. As narrativas permitiram identificar uma experiência de alfabetização destinada a crianças negras e de famílias economicamente desfavorecidas, realizada em um espaço que também assumiu diferentes funções ao longo do tempo, como salão de baile, pensão, bar, escola de datilografia e tapeçaria. Os relatos atribuem a Octacílio David a iniciativa de custear o trabalho de professoras, evidenciando a educação como preocupação comunitária e possibilidade de transformação das condições de vida. Os depoimentos também evidenciam experiências de discriminação e estigmatização nas quais a cor da pele, pobreza e pertencimento territorial se articulavam. Conclui-se que a Vila Raposa constituiu não apenas um espaço de moradia, mas um território de sociabilidade, solidariedade e produção de estratégias educativas, contribuindo para ampliar a compreensão da história da educação da população negra em Matão.
Recent research on home advantage (HA) in professional football leagues during the COVID-19 pandemic has yielded conflicting findings, prompting further examination of the impact of social support elimination on teams accustomed to packed stadiums. We analysed HA changes among the 51 European teams with the highest average attendance per match over the past five seasons: two pre-pandemic (2017/18, 2018/19), one pandemic (2020/21) without crowd support, and two post-pandemic seasons (2021/22, 2022/23). Employing four linear mixed models (teams as a random factor) - two encompassing teams across different league tiers ("all teams") and two focusing solely on "top-tier teams" - we found a significant negative correlation between team ability and HA, with each unit increase in team ability associated with a 0.12% to 0.15% reduction in HA. Specifically, top-tier teams experienced a notable 7% decrease in HA during the COVID-19 period (p < .05). Our analysis also underscored the explanatory power of crowd density, positively influencing HA changes for all teams. This study suggests that HA fluctuations during COVID-19 were partially related to team ability rather than crowd absence in stadiums, implying that HA changes may vary depending on the team. Practitioners and sports organisations can use these findings to gauge the magnitude of HA in specific contexts, while considering variations in team ability. This insight facilitates informed decision-making regarding match preparation, training programmes, structure regulations, and marketing strategies. Future research should pay close attention to sample selection, as minor modifications can have substantial implications for understanding the crowd support effect on HA.
Few studies have investigated the ichthyofauna of streams in the upper Purus River basin, hampering efforts to understand the diversity of these numerous bodies of water. This study presents the first inventory of the ichthyofauna in the upper Purus-Antimary interfluve, southwestern Amazonia. The study was based on data compiled from various sources, including online repositories, scientific articles, and fish collected from four streams in a protected area. We assessed species richness, distribution area, conservation status and anthropogenic threats. The fieldwork study was carried out in four "terra firme" streams in the Purus River basin, with fieldwork conducted during the rainy season in March and November 2017. We identified a total of 92 species, 26 families, and six orders. The order Characiformes exhibited the highest species richness with 42 species, followed by Siluriformes with 34, and Gymnotiformes with 8 species. The Characidae family was the most diverse, with 25 species, followed by Loricariidae with 11 species and Callichthyidae with seven species. The collected fish samples totaled 1,794 individuals representing 58 species, 22 families, and 4 orders. The most abundant species were Knodus smithi with 307 individuals, followed by Chrysobrycon hesperus with 247 and Tyttocharax madeirae with 165. Most species were classified as being of low conservation concern. The study expanded the known extent of occurrence for Anablepsoides hoetmeri to 2,163.777 km2. Our findings underscore the importance of conserving aquatic habitats and riparian vegetation within the upper Purus-Antimary interfluve, given the presence of a rich and restricted ichthyofauna. Furthermore, we highlight the significant risks posed by anthropogenic pressures such as deforestation for pastures, wildfires, and illegal fishing activities.
This paper explores the influence of complex magnetic fields on the quantum information properties of graphene, using Shannon and Fisher information measures. Due to its distinctive electronic characteristics, graphene is an ideal platform for investigating how quantum information can be modulated by varying magnetic field configurations. Through theoretical analysis and computational simulations, we study the effects of these complex fields on the electronic states and information entropy of graphene. Shannon information is employed to measure the uncertainty or entropy associated with the electronic states, while Fisher information evaluates their sensitivity to magnetic field variations. Our results show that complex magnetic fields can significantly reshape the quantum information dynamics of graphene, highlighting potential applications in quantum computing and information processing.
