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Dispositivos de memória em heteroestruturas 2D de MoSe2 sobre clinocloro
(Universidade Federal de São Carlos, 2024-08-29)
Ames, Alessandra
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Cadore, Alisson Ronieri
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https://lattes.cnpq.br/7547090345773696
;
https://orcid.org/0000-0003-1081-0915
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Teodoro, Marcio Daldin
The study of materials that present lamellar characteristics and can be isolated in monolayers has become relevant due to their unique properties widely reported in the literature. The transition metal dichalcogenides (TMDs), semiconductors members of the lamellar materials' group, raise interest in the fabrication of devices through the so-called van der Waals heterostructures (vdWHs). This stems from the fact that TMD's monolayers are susceptible to local defects, charge exchange with the substrate, and substrate roughness, and are generally encapsulated by atomically-flat and insulating materials, such as hexagonal boron nitride (hBN). Due to the factors mentioned, the photoluminescence (PL) emissions, intense in TMDs, can be modulated by external factors, such as electric and magnetic fields and some specific properties of the substrates. Considering the need to miniaturize the devices, and the need to expand the list of appropriate insulators for the vdWHs, which is limited so far, this work aimed to characterize the effects of a clinochlore's substrate, a lamellar phyllosilicate, in the optical responses of a device containing a molybdenum diselenide (MoSe2) monolayer coated with a layer of hBN. For this purpose, optoelectronic studies were carried out at cryogenic temperatures as a function of an external electric field and variable changes such as bias sweep rate (time) and excitation power to the sample. Optical emissions compatible with excitons and trions were observed, which showed to be highly modulated with the applied voltage. The obtained curves assumed a hysteretic shape, stable in time, and independent of factors such as polarization and the initial direction of the applied electric field. In addition, temporal measurements revealed the existence of transients in different scales, which indicates memory effects related to the charge dynamics and fluctuations in carrier population and polarization of the material. In particular, the observed phenomena are directly related to the presence of the clinochlore, since such responses were not noted in a sample containing a hBN-encapsulated TMD. Therefore, from the results obtained, it was possible to prove the so-called mem-emitters, i.e., light-emitting devices that present memory effects to external stimuli, whose existence has recently been reported.
Estudo comparativo de soldagem entre os processos TIG automatizado e o processo TIG manual na fabricação de tanques com espessura de chapa reduzida
(Universidade Federal de São Carlos, 2024-08-29)
Cherubim, Sandro
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Afonso, Conrado Ramos Moreira
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https://lattes.cnpq.br/2176215981291453
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https://orcid.org/0000-0001-7505-8467
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Araujo, Luis Antonio Oliveira
Automation in welding processes has been growing since the 1970s. The technical benefits, when compared to the manual welding process, are numerous: productivity, quality, operator safety, and other things. This project addresses TIG welding (Tungsten Inert Gas), also known as GTAW (Gas Tungsten Arc Welding), developed between the late 1930s and the early 1940s, during a period of significant industrial and technological transformation driven by World War II. This historical context was marked by an intense demand for new manufacturing processes, especially to meet the needs of the growing aeronautical and military industries, which required more sophisticated and precise welding methods. Currently, this process is of utmost importance in the manufacturing and maintenance of parts in different sectors, such as automotive, railway, aerospace, civil, among others. The advantage of TIG welding includes the high quality of the welds produced, the possibility of joining different materials, and dimensional precision. The general objective of this work was to develop a study to verify the feasibility of the automated (orbital) TIG welding process, in relation to the manual TIG process, applied in the production of water reservoirs in AISI 304 stainless steel. The reservoirs are part of solar heating systems and are designed to have sheets up to 2 mm thick. The established method was to compare the appearance, structure, and functionality of the weld beads through visual analysis, tensile mechanical testing, liquid penetrant testing, and magnetic particle testing. The study used samples taken from water reservoirs (body and lid) made of AISI 304 stainless steel. The tensile mechanical tests demonstrated that the automated welds had moderate results, with 7 out of 12 test specimens breaking in the base material instead of the weld, indicating that the weld was not the weakest point. The stress versus strain graphs, comparing the manual and automated processes, indicate that the base material has a tensile strength between 600 and 675 MPa, with a deformation of 0.6 to 0.7. The automated weld, on the other hand, exhibited higher tensile strength, between 800 and 900 MPa, but with lower deformation (0.3 to 0.4). The results of the Liquid Penetrant and Magnetic Particle tests revealed discontinuities in both manual and automated welds, suggesting the need for improvements in the sheet preparation process. The design and construction of an automated orbital TIG welding machine was primarily motivated by the increase in productivity, with a 25% improvement in speed compared to the manual process. This increase in speed impacts quality factors, such as weld penetration, highlighting that the automated process is viable but still requires improvements.
Educação socioemocional no currículo da educação integral do município de Araraquara -SP: uma análise documental
(Universidade Federal de São Carlos, 2024-08-29)
Santos, Patrícia Fiais Pereira dos
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Silva, Alexandre Rodrigo Nishiwaki da
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https://lattes.cnpq.br/8697942957516547
;
https://orcid.org/0000-0003-4431-0062
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https://lattes.cnpq.br/9156030690533893
This research is a master's dissertation, linked to the Professional Postgraduate Program in Education of the Federal University of São Carlos, and aimed to study and investigate the theme of socioemotional education in the official curriculum of the city of Araraquara-SP, as well as to identify which elements of this document can enhance and which elements can hinder the socioemotional development of students in the comprehensive education program of the city of Araraquara. To this end, the study was carried out based on the documentary analysis of some productions on curriculum and curricular guidelines and legislation regarding socioemotional education. We consider that socioemotional education, when prioritized, is undoubtedly a potentializing agent in the process of student development, as different research in the area has pointed out. To this end, we first conducted a literature review focused on the topic and then, based on the guiding documents for comprehensive education in the city of Araraquara, we sought to understand which actions within the school are important for the construction of socio-emotional intelligence as well as the strengthening of emotions for intellectual development and personal and interpersonal relationships. The documentary analysis was carried out through a qualitative methodological approach, which is in line with the research's intention. The results of this study indicated the relevance of socio-emotional education in the development of children and adolescents, as well as the workshops of comprehensive education in Araraquara that favor the development of competence. The work was successful in verifying that the comprehensive education curriculum in Araraquara contributes to cognitive and socio-emotional development, elevating its students to a human formation, which values life in society, the strengthening of emotions, personal and interpersonal relationships, as well as behaviors that meet the characteristics necessary for the construction of an empathetic, emotionally strengthened society based on values of common well-being.
Uma análise semântica de 'junto' e de suas variações no português brasileiro
(Universidade Federal de São Carlos, 2024-08-29)
Araújo, Ana Carolina de Sousa
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Basso, Renato Miguel
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https://lattes.cnpq.br/6984826176670527
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https://orcid.org/0000-0003-2580-0365
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https://lattes.cnpq.br/1632059549342508
In this work we will carry out a semantic analysis of the expression ‘junto’ in Brazilian Portuguese (BP), taking into account its morphological characteristics, that is, its inflection in number and gender (‘juntos’, ‘juntas’) and its use in the diminutive (‘juntinho/s/as’), the different syntactic positions that the item can occupy in a sentence and the anti-distributive/collectivizing character that seems to be related to the expression. To this end, linguistic context tests will be carried out with the item JUNTO, a metaform that we will use to represent the different forms of the term, seeking to capture the different interpretations that the expression can have in BP. Having done this, we will analyze the data based on two distinct theories that were presented as a possible description for the term together, which can be understood as a close equivalent of 'junto' in English, namely, the proposal of overlapping events presented by Lasersohn (1998), and the measurement approach defended by Moltmann (2004), with the aim of discovering whether, and how, such theories can be used to explain the semantic behavior of ‘junto’ and its variations in BP. In this way, we seek to contribute not only to the description of this expression, which has not yet been studied in Brazilian Portuguese, but also to semantic studies in general.
Filmes de celulose incorporados com macro (K, Ca e Mg) e micronutrientes (Fe, Cu e Mn) como recipiente para propagação vegetal
(Universidade Federal de São Carlos, 2024-08-29)
Duarte, Maria Carolina Salomé
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Souza, Claudinei Fonseca
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https://lattes.cnpq.br/4858219292242433
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https://orcid.org/0000-0001-9501-0794
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Faez, Roselena
An approach to minimizing the environmental, agronomic, and economic impacts of excessive fertilizer use is to optimize nutrient release through controlled and/or slow-release fertilizers, such as enhanced efficiency fertilizers (EEFs). However, many commercial EEFs contain non-biodegradable matrices that can lead to environmental contamination. Using biodegradable polymers like cellulose can mitigate this issue and improve fertilizer efficiency. In addition to functioning as EEFs, cellulose films can also serve as substrates for plant propagation, making them a promising alternative. This study developed and modified phosphorylated cellulose (P-Cel) films with phosphate groups to enhance the introduction and retention of ions such as K+, Mg 2+, Ca2+, Cu2+, Fe2+ e Mn2+. The films were prepared via casting with 1% (w/v) P-Cel incorporated with salts of Ca(NO3)2, KNO3, MgSO4.7H2O, CuSO4.5H2O, FeSO4.7H2O e MnSO4.H2O, and were characterized thermally (TGA, DSC), structurally (FTIR, XRD), and morphologically (SEM), in addition to evaluating ion release in water. The results indicate that the cellulose phosphorylation was successful, with 40% phosphorylation, and that the films functioned as EEFs, as confirmed by structural, thermal, and morphological analyses. The incorporation of salts was evidenced by band broadening and intensification and the appearance of new NO3-, SO42-, P=O, and P-O-H bands. XRD revealed interactions between the salts and P-Cel, particularly in equimolar quantities, while excess salt partially masked the characteristic peaks of P-Cel and the fertilizers. Thermal analyses confirmed the presence of salts, indicated by the release of water molecules from the hydrated salts after cation binding with phosphate. Elemental mapping (EDS) reinforced these interactions, showing a greater affinity of Ca2+ for PO43- compared to NO3-. Water solubility tests showed that macronutrients were released within the first 60 min, while micronutrients were released within 8 h, indicating a slower release than pure salts. Thus, P-Cel/fertilizer films demonstrate great potential as EEFs, as they are biodegradable, minimize environmental pollution, and provide controlled nutrient release, contributing to plant propagation and sustainability.
Da ordem ao caos: um olhar para a indisciplina nas aulas de arte
(Universidade Federal de São Carlos, 2024-08-29)
Craveiro, Barbara Alves dos Passos
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Souza, Maria do Carmo de
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https://lattes.cnpq.br/6637658562543505
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https://lattes.cnpq.br/9276327504714566
This research focuses on the relationship between indiscipline and art, based on the assumption that various interactions occur in art classes, both between students and between students and the teacher. In this sense, the focus is on the interactions that take place during theater classes taught at a school in the city of Barretos, São Paulo. The research question we aim to answer is: What are the interactions of students considered undisciplined in basic education art classes? From this question, the general objective of the research is to investigate how students considered undisciplined interact in art classes. We observed that the art subject, taught in schools, fosters various interactions in the classroom, including those related to indiscipline. As a teacher-researcher, I have noticed that such indiscipline might be associated with the restlessness of students in this age group, which can be understood as a form of discomfort with the current educational system. In art classes, students tend to establish better interactions. The specific objectives initially stemmed from Yves de La Taille's view, in which indiscipline can be understood as a revolt against rules or ignorance of them. However, throughout the research, we explored additional specific objectives, which helped answer the research question. What interactions occurred during theater classes? What is the social view of indiscipline, and how is it perceived within the school community? Is indiscipline truly the major problem in education? Are freedom and creativity significant elements in the learning process? The study revealed a respectful relationship between creative freedom and student interactions. It also highlighted the difficulty in relating indiscipline to a social context, often reducing it to a family issue. Through the language of art, particularly theater, we observed various interactions without the presence of indiscipline, thereby presenting a positive perspective on art in this regard. The research is of a qualitative-quantitative nature, as it is based on description, classification, and interpretation. For this study, the participants were students and teachers from the state public school system in the city of Barretos, São Paulo. Information was obtained from classes held at this school and from a questionnaire answered by thirteen teachers. One of the results indicated by the research shows that teachers view art as a subject that can help students understand the content of other subjects. In other words, from the teachers' perspective, art can be considered an interdisciplinary subject. However, there is some inconsistency, as teachers also believe that indiscipline stems from family issues. Another result highlights that the class considered the most undisciplined by the school, based on the analysis, achieved excellent results in the activities proposed and developed during art classes. This study answers the research question by emphasizing that numerous interactions occurred, including teacher-student, student-student, student-activity, student-class time, and student-teacher-knowledge, and none of these interactions exhibited so-called "undisciplined" behavior.
Application of CFD to study the dynamics of droplets expelled during coughing
(Universidade Federal de São Carlos, 2024-08-29)
Ayuba, Nuhu
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Justi, Gabriel Henrique
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https://lattes.cnpq.br/0170230384799537
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https://orcid.org/0000-0002-3141-3137
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Lopes, Gabriela Cantarelli
Este estudo investiga o comportamento das gotículas respiratórias em ambientes internos, aplicando o método Euleriano-Lagrangeano para melhorar a compreensão da transmissão de gotículas no contexto de Doenças Respiratórias Infecciosas (DRIs). A pesquisa está dividida em quatro seções principais. A primeira parte avalia os efeitos de diferentes modelos de turbulência—SST k-ω, k-ε padrão e Tensões de Reynolds—sobre a evaporação de uma única gotícula, com o objetivo de identificar um modelo que seja preciso e computacionalmente eficiente. A segunda parte compara o uso de malhas tetraédricas e hexaédricas graduadas na simulação do comportamento das gotículas, avaliando sua eficácia relativa e o custo computacional. Na terceira parte, é examinado o efeito do acoplamento de fase, o tamanho das gotículas e a umidade relativa sobre o processo de evaporação, enquanto a quarta parte explora o impacto das condições de contorno do vento na dispersão das gotículas. Para validar ainda mais os resultados, os modelos desenvolvidos foram aplicados nas condições climáticas de São Carlos, São Paulo, Brasil, para observar o comportamento das gotículas em um ambiente real. Os resultados demonstram que as malhas hexaédricas fornecem uma representação mais precisa do comportamento das gotículas em comparação com as malhas tetraédricas, que apresentaram discrepâncias com estudos anteriores. O efeito do acoplamento de fase foi encontrado como mínimo, com as gotículas menores evaporando rapidamente, independentemente da umidade ambiente, enquanto as gotículas maiores caíam ao chão. O estudo também revela que níveis mais altos de umidade desaceleram a evaporação, com gotículas de tamanho médio (cerca de 50 µm) persistindo por mais tempo e viajando mais longe—até aproximadamente 1,40 metros. Isso sugere uma distância mínima de distanciamento social em ambientes internos e tranquilos para minimizar a transmissão de DRIs. Além disso, gotículas menores evaporaram rapidamente e sua dispersão aumentou com velocidades de vento mais baixas. A pesquisa conclui que a condição de contorno de não-deslizamento é mais econômica para simulações em ambientes internos. Esses resultados contribuem com valiosas informações para entender o comportamento das gotículas e otimizar modelos para análise da transmissão de DRIs em espaços fechados.
Mercado de IPOs: uma comparação entre períodos de crise
(Universidade Federal de São Carlos, 2024-08-29)
Castagno, Pedro Affonso Rachas
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Carrara, Aniela Fagundes
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https://lattes.cnpq.br/2348376949393246
During the most significant global crises of recent times – the Subprime Crisis between 2007-2008 and the COVID-19 Pandemic between 2020-2021 – Brazil observed the highest volumes of IPOs (initial public offerings) in its history. In this context, this paper aims to discuss what motivated this large number of offerings, even in challenging times, and to assess how macroeconomic variables relate to and influence IPO activity. To this end, the study method involved a literature review and descriptive data analysis. The period evaluated was from the fourth quarter of 2004 to the fourth quarter of 2023, covering the two crisis moments in question and also providing a comparison with previous and subsequent periods. As a result, it was found that the Selic rate had a significant and inversely proportional relationship with IPOs. Inflation, although not having an immediate direct relationship with IPOs, influences the Selic rate, indirectly affecting the IPO market. GDP showed a positive correlation with the number of IPOs. The exchange rate, despite significant fluctuations, shows a weak relationship with IPOs, reflecting more the outflow of foreign capital than the issuance of shares.
“Era uma vez” uma formação em pedagogia: a construção de uma trajetória na docência
(Universidade Federal de São Carlos, 2024-08-30)
Gonçalves, Amanda Minetto
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Machado, Michele Varotto
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Hai, Alessandra Arce
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https://lattes.cnpq.br/0506121990457151
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https://lattes.cnpq.br/3845288858275245
This work is a Memorial of Academic Formation, written by me, Amanda Minetto Gonçalves, where I provide accounts of experiences aimed at recalling memories from my personal and academic life up to adulthood. I address aspects of my school life, the choices I made regarding my academic path, as well as all the experiences that have brought me to where I am today. I emphasize the importance of the influence of my family and many friends throughout this process. Reliving these moments led me to reflect on everything that has been added to my personal, social, and professional life, resulting in a process of personal and professional growth and maturation. Writing about my educational and academic journey required me to recall and document all the events that positively contributed to my teaching practice. The results were extremely positive and allowed me to recognize the phases of balance, frustrations, and restlessness experienced throughout my life, which have shaped my identity and guided my dreams and the reality I currently live.
Membrana celulares modelo: uma revisão teórica
(Universidade Federal de São Carlos, 2024-08-30)
Paixão, Rafaela Ribeiro
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Carlos, Rose Maria
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https://lattes.cnpq.br/1589143355309943
Knowledge about the cell membrane is extremely important as it is what divides the boundaries of the cell, separating the extracellular environment from the intracellular environment, and is responsible for the transport of substances and is the target of study for the development of techniques and mechanisms in various areas of Science, including drug delivery systems, selective sensors, etc. Due to factors such as cellular diversity, dynamic structure and complex metabolism, they make the study of the membrane difficult, making it necessary to seek alternatives to better understand this system. In this context, Model Cell Membranes emerge, which are membrane models created to mimic the structure and composition present in cell membranes. Model membranes can be mimicked in different structures and with numerous compositions, which allows applications with different purposes and with different techniques for study and characterization, including new materials, nanoscale encapsulation technology for foods and medicines, biological sensors, etc. Biophysical and biochemical interaction studies with model membranes are a simple and effective approach to knowing and understanding the dynamics of natural cell membranes.
Os músicos, por eles mesmos: criativos, hiperflexíveis e “à deriva”
(Universidade Federal de São Carlos, 2024-08-30)
Moya, Cyntia Malaguti
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Lima, Jacob Carlos
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https://lattes.cnpq.br/9244132532446607
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https://orcid.org/0000-0001-6475-9575
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https://lattes.cnpq.br/2525242861349890
This project investigated musicians, considered as "creative" workers, questioning how they perceive themselves as workers and how such perceptions impact their career management. The main objective was to analyze, based on the interpretations of the subjects themselves about their own experiences, how careers are built in an activity perceived as relying more on talent than formal education, placing the discussion in the context of work reconfigurations in recent decades. To this end, we sought to recover the logic that articulates "creativity," flexible markets, and the use of new technologies in the daily lives of their activities and trajectories. The hypothesis was that musicians' self-perceptions are linked to meanings attributed to musical activity, which manifest in heterogeneous forms of "being an artist," blending work, personal fulfillment projects, and various activities within and outside of music, depending on whether it is understood as a primary or complementary occupation. The scope of the analysis was the state of São Paulo (SP) and the period between 2012 and 2023. The approach was qualitative, involving the application of semi-structured interviews and field observations. The doctoral research, conducted between the years 2020 and 2024, also followed the context of social isolation due to the pandemic. Complementing the proposal, we discussed throughout the text and in a specific chapter how the pandemic affected a traditionally restricted market situation. The results showed that most musicians identify as entrepreneurs, associating this self-image with positive meanings. Additionally, they value personality traits such as a taste for change and the ability to restart and constantly reinvent themselves to cope with instability and uninterrupted work, which requires high emotional engagement and the performance of multiple activities. Thus, this research aims to contribute to discussions on the complexity of contemporary work, addressing the intersections between professionalization and amateurism, work and personal life, and the meanings attributed to hyper-flexible work contexts.
Narrativas carnavalescas: memórias e discursos sobre orixalidades representadas em desfiles de Escolas de Samba de São Paulo
(Universidade Federal de São Carlos, 2024-08-30)
Corrêa Pinto, Danilo
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Massarolo, João Carlos
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https://lattes.cnpq.br/3308336910966465
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https://lattes.cnpq.br/1321339113516502
Esta investigación analiza las memorias, las imágenes y los significados producidos y compartidos sobre la representación de orixalidades en los desfiles de Escuelas de Samba de San Pablo, y cómo esto contribuye al conocimiento, a la difusión y a la creación de un espacio de resistencia de las propias religiosidades afrobrasileñas. El análisis propone una mirada discursiva, interpretativa y pluridisciplinaria acerca del propio carnaval paulistano y sobre algunos desfiles que enuncian, producen y regularizan formas artísticas y de lenguaje. Estas formas, a su vez, resaltan prácticas identitarias afrobrasileñas, difunden un imaginario iconográfico-religioso, y fundamentan un saber cultural y artístico sobre las Escuelas de Samba referidas al universo de orixalidades. De esta forma, la investigación se estructura una creación de narrativa carnavalesca, pues, a través de ella podemos comprender, recortar, definir y analizar el conjunto de las prácticas literarias, lingüísticas, performáticas, sonoras, visuales, entre otras, que componen un desfile de Escuela de Samba. Nuestro gesto de lectura analítica tiene aún por objetivo colaborar, al mismo tiempo, con análisis constructivos, críticos y reflexivos acerca de la producción cultural, histórica y social de estas instituciones inseridas en el escenario festivo brasileño y más allá de él.
Relação entre indicadores socioeconômicos e a incidência e mortalidade por Covid-19 na população negra do estado de São Paulo
(Universidade Federal de São Carlos, 2024-08-30)
Cavalcanti, Letícia Fernandes
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Uehara, Sílvia Carla da Silva André
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https://lattes.cnpq.br/3903413440784581
;
https://orcid.org/0000-0002-0236-5025
;
https://lattes.cnpq.br/8660031385168650
This study aimed to analyze the relationship between the incidence and mortality coefficients of Covid-19 in black and brown people in the state of São Paulo and socioeconomic indicators. This is an ecological study carried out from February 2020 to February 2022 in the state of São Paulo, considering the reported cases of Covid- 19 in black and brown people of all age groups, sex and schooling. The data related to Covid-19 was collected from the official websites of the State Data Analysis System Foundation, OpenDataSUS and DATASUS and the data relating to the HDI, income and schooling variables was obtained from the official IBGE website. Initially, a descriptive analysis of the data was carried out, then the Bivariate Global Moran's index was calculated and the formation of clusters was analyzed. During the study period, the Administrative Region (AR) of Registro recorded the highest incidence rate of Covid-19 cases among black and brown people, 5569/100,000 inhabitants, and the highest mortality rate was recorded in the AR of Santos, 379.4/100,000 inhabitants. A weak positive spatial correlation was found between Covid-19 incidence and mortality among black and brown people and the HDI, median income and a positive spatial correlation between black and brown people who had completed high school. Thus, it was concluded that there was a spatial correlation between Covid-19 incidence among black and brown people and socioeconomic indicators in the RAs of the state of São Paulo; as well as a correlation between Covid-19 mortality in this population group and socioeconomic indicators in the state of São Paulo.
Desenvolvimento de magneto-imunoensaios para detecção de anticorpos em amostras de plasma e aplicação no diagnóstico da COVID-19 e da COVID longa
(Universidade Federal de São Carlos, 2024-08-30)
Silva, Pablo Roberto Lins da
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Faria, Ronaldo Censi
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https://lattes.cnpq.br/8659496864305621
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https://orcid.org/0000-0003-1094-9597
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https://lattes.cnpq.br/3789110165650918
In 2019, the virus known as Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) caused a global surprise due to its high transmissibility, leading the World Health Organization (WHO) to declare the COVID-19 pandemic. The diagnosis of the disease is predominantly performed by RT-PCR and rapid tests, both of which have certain limitations. Antibody detection is an effective strategy for diagnosis and prognosis, contributing to the reduction of the transmission rate. This study proposes a diagnostic method to detect IgM antibodies, indicative of recent or active infection, and IgG antibodies for post-vaccination monitoring. The proposed immunoassay involves using magnetic particles (MPs) functionalized and modified with the Spike (S) and Nucleocapsid (N) proteins of SARS-CoV-2, which recognize antibodies in the plasma sample. The developed method employed a disposable electrochemical microfluidic device containing eight screen-printed carbon electrodes, allowing for eight simultaneous analyses. The method achieved an ultra-low detection limit of 7.13 ag mL-1 for anti-S IgG antibodies, 55.4 ag mL-1 for anti-S IgM, and 51 ag mL-1 for anti-N IgG. The method was tested on plasma samples from healthy individuals and patients diagnosed with COVID-19 by RT-PCR. The validation of the magneto-immunoassay, evaluated by ROC curve and scatter plot, demonstrated high specificity and sensitivity. Thus, the proposed electrochemical immunoassay proved to be highly specific and sensitive for the detection of IgG and IgM antibodies, making it a useful and rapid tool for the diagnosis of COVID-19 and long COVID.
Desenvolvimento de catalisadores a base de cobre modificados com monoetanolamina para aplicação na redução de CO2
(Universidade Federal de São Carlos, 2024-08-30)
Almeida, Jéssica de
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Silva, Gelson Tavares da
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https://lattes.cnpq.br/1463546552427589
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https://orcid.org/0000-0001-9448-1455
;
Mendonça, Vagner Romito de
The photo and electrochemical conversion of CO2 into higher-value products, such as fuels and chemical precursors, emerges as a promising solution to mitigate carbon emissions and meet the growing global energy demand. However, the viability of these technologies hinges on developing efficient, stable, and cost-effective catalysts. In this work, modified Cu-based catalysts were evaluated for their potential application in the photo and electroreduction of CO2. Aiming to enhance selectivity, reagent availability on the surface, and reduce the reaction overpotential, the studied catalysts were functionalized with nitrogen groups derived from monoethanolamine (MEA), which act as CO2 adducts. The syntheses were conducted by solvothermal reaction and chemical precipitation, both simple techniques involving a single reaction step to obtain the final material. These materials were characterized by various analytical techniques and further applied in CO2 reduction processes. The catalysts synthesized by the solvothermal reaction exhibited compositional variations with copper fractions in different oxidation states, depending on the concentration of added MEA. These catalysts were then assessed for their applicability in the photochemical reduction of CO2, achieving methanol production rates of 1097 µmol g-1h-1, with selectivity greater than 85%. The samples synthesized by chemical precipitation resulted in forming CuO catalysts with different morphologies and crystallite sizes depending on the alkaline agent utilized in the synthesis. The catalyst synthesized with MEA exhibited superior performance in the photoreduction of CO2 compared to catalysts synthesized with other bases (NaOH, KOH, NH4OH), with a methane production rate of 57.2 µmol g-1 h-1. The enhanced activity was attributed to the functionalization of the surface with nitrogen groups. In the electroreduction of CO2, the use of the MEA-functionalized catalyst resulted in current densities of approximately 155 mA cm-2 and stability exceeding 100 hours in long-term tests. The results of this work indicate that functionalization with MEA increases the efficiency of copper-based catalysts in CO2 reduction, both in photochemical and electrochemical processes.
Produção científica nos periódicos de educação na base SciELO (2013-2020): um estudo bibliométrico
(Universidade Federal de São Carlos, 2024-08-30)
Santarpio, Éder José
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Hayashi, Carlos Roberto Massao
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https://lattes.cnpq.br/9136586124586219
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https://orcid.org/0000-0003-1481-5545
;
https://lattes.cnpq.br/3135584595001001
Scientific communication is a fundamental part of the knowledge production process, as it is through it that the results of scientific investigations are disseminated. As one of the main means of scientific communication, the journal is responsible for publishing newly generated results validated by a peer review system, which guarantees the quality and reliability of the publication. In this way, the bibliometric approach assumes a fundamental role in the process of analyzing the behavior of scientific production, since, through its analyses, it becomes possible to represent the development of a given scientific field, with its particularities and potentialities. Objectives: Thus, the main objective of the research is to analyze scientific production in the field of Education, examining publications carried out between 2013 and 2020 in specialized journals in the educational area. And as specific objectives: Prepare a brief history of the six periodicals that make up the research corpus.; map, through the bibliometric approach, scientific production in the field of Education, identifying institutions, regional and international distribution of affiliations; identify how bibliographic production is organized in relation to authorship and co-authorship in the field of Education; analyze the profile of authors in relation to gender in the field of Education; Identify the themes studied in the texts published in the analyzed journals; identify the use of other languages in texts published in the journals analyzed; verify the applicability of Lotka's law in the educational field. Methods: According to the objectives, the research will adopt a qualitative and quantitative approach with the bibliometric approach as an analysis tool. Briefly, the research was developed in seven distinct phases: Preparation of the theoretical framework; development of the collection protocol; data collect; construction of bibliometric indicators (articles and authorship); storage, description and processing of data; contextualization of periodicals; analysis and interpretation of results. Results: Among the results obtained, the following stand out: Growth of scientific production in the field of Education. Growth in the publication of texts in other languages, mainly in English, adherence to publishing texts in another language by researchers working in the field of Education. Furthermore, it was possible to identify that the research published in the journals analyzed reflects a thematic diversity, which demonstrates the scientific scope of the educational field. Regarding the gender of the authors, it was possible to identify that the majority of authors are female. However, the analysis demonstrated that there is a considerable tendency for scientific collaboration through female-only co-authorship. Regarding geographic distribution (national and international), it is noted that there is a geographic concentration, that is, regions and countries with a large number of institutional vehicles. Regarding national institutions, the vast majority of links are located in the southeast region, mainly in the state of São Paulo. The analysis of the productivity of the authors demonstrated that there is no concentration of large producers of studies and when applying Lotka's law to the journals analyzed, it was possible to identify that 70.7% (n=3,318) of the authors had only one contribution, which differs from the 60% provided for by law. Conclusion: It is possible to conclude, even with all the historical issues that permeate the development of research in the field of Education, that educational research published in journals reflects thematic, geographic and institutional diversity, demonstrating, therefore, the breadth and depth of research coming from the field of Education.
Evolução cromossômica, diversidade genética e história demográfica em espécies do gênero Pyrrhulina (Characiformes, Lebiasinidae)
(Universidade Federal de São Carlos, 2024-08-30)
Moraes, Renata Luiza Rosa de
;
Cioffi, Marcelo de Bello
;
https://lattes.cnpq.br/0242034365085727
;
https://orcid.org/0000-0003-4340-1464
;
https://lattes.cnpq.br/5619599526512809
The Lebiasinidae family includes seven genera of tiny freshwater fishes that live in streams throughout Central and South America (except Chile). The family's representatives have a wide range of shapes and colors, making them highly desirable in the aquarium industry. Despite being a group that stands out within the Characiform order for its diversity of species, this family has received little attention, owing to collection challenges, chromosome obtaining, and complex taxonomy. Although they constitute a substantial challenge, multiple cytogenetic and molecular research involving the group have been developed throughout the years, contributing considerably to the beginning of the resolution of various uncertainties. Thus, our study is part of a larger cytogenetic and genomic effort to understand the evolutionary history of the Lebiasinidae family. Continuing the studies, with a primary focus on the genus Pyrrhulina, cytogenetic, molecular, and genetic analyses were combined with the goal of analyzing the group's karyotypic evolution, understanding the influence of the sex chromosome system in Pyrrhulina species differentiation, and organizing a phylogeny based on molecular data from the Lebiasinidae family. Five new Pyrrhulina species (Pyrrhulina aff. marilynae, Pyrrhulina cf. laeta, Pyrrhulina marilynae, Pyrrhulina obermulleri and Pyrrhulina sp.) were studied using conventional and molecular cytogenetic techniques, including Giemsa, C-banding, repetitive DNA mapping, comparative genomic hybridization (CGH), and whole chromosome painting (WCP). The results showed a conserved 2n for most species, ranging from 40 to 42 chromosomes and a predominantly acrocentric karyotype, with P. marilynae being an exception, with 2n=32 and the unusual presence of four pairs of metacentric chromosomes, the plesiomorphic status of which is questioned. The distribution of microsatellites is similar among species, while the number and position of rDNA sites vary greatly. Interspe-cific CGH tests revealed moderate divergences in repetitive DNA content between the species' genomes. Surprisingly, the WCP studies supported the theory that Pyrrhulina semifasciata's X1X2Y multiple sex chromosome system evolved. To better understand the formation of such a sex chromosome system and the karyotypic reduction observed in P. marilynae, analyses were also carried out using satellite DNA sequences from these species. The results showed the possible influence of these sequences on the karyotype reduction of P. marilynae and reinforced the hypothesis about the formation of the sex chromosome system of P. semifasciata. Furthermore, to conclude the studies conducted here, the first karyotype of Copella was described, along with a phylogeny based on molecular data of representatives from each of the genera of Lebiasinidae, which contributed to discussions about the family's internal phylogenetic relationships. In conclusion, the data point to the possibility that structural rearrangements combined with a high dynamic of repetitive DNAs drove the karyotypic differentiations under study, particularly in the case of the genus Pyrrhulina.
Confinamento quântico: influência geométrica na análise espectral
(Universidade Federal de São Carlos, 2024-08-30)
Bello, Diana Carolina Suarez
;
Verri, Alessandra Aparecida
;
https://lattes.cnpq.br/8794549732815622
;
https://orcid.org/0000-0003-4348-7245
;
https://lattes.cnpq.br/1880261381430298
Let $\Omega$ be a domain in $\mathbb {R}^3$. Consider $-\Delta_{\Omega_\beta}^D$ the Dirichlet Laplacian operator in $\Omega_\beta$. In this work, we performed a detailed analysis of the spectral properties of $-\Delta_{\Omega_\beta}^D$ in case that $\Omega_\beta$ is a waveguide with corner, a waveguide with varying corner and in the case of a straight, stretched and locally twisted waveguide. In particular, we find information about the essential and discrete spectrum of the operator, in which each one of the results obtained are influenced by the respective geometry of $\Omega_\beta$. Furthermore, we realized a spectral analysis of the Laplacian operator on a surface shaped like a waveguide.
A Institucionalização das Ações Afirmativas Estudantis na Universidade Estadual do Piauí (UESPI): avanços a conta-gotas
(Universidade Federal de São Carlos, 2024-08-30)
Nóbrega, Evangelita Carvalho da
;
Rothen, José Carlos
;
https://lattes.cnpq.br/1942510389127549
;
https://orcid.org/0000-0002-5360-1913
;
https://lattes.cnpq.br/9207221208772139
The institutionalization of affirmative action policies in higher education in Brazil, in the form of access, has been taking place since 2002, based on the autonomy of universities, in state and/or federal legislation. It should be noted that the democratization of access requires transformation in higher education institutions. The challenge now is to institutionalize the policy of student permanence, as it is a phenomenon that is emerging and expanding, and can lead to the construction of a new model of university, plural, diverse, popular, anti-racist, democratic, with indicative affirmative action becoming effective and full. However, the public resources made available by the state for affirmative action are insufficient to guarantee the rights of students in situations of socio-economic vulnerability and inequality. Given that it is the responsibility of the HEIs to institutionalize affirmative action for students, these actions occur in a variety of ways, as they require organizational tools for administrative, pedagogical and academic management. In this sense, the general objective of this research was to understand the institutionalization of affirmative student actions, materialized in the normative instruments, which imply the development of the policy of access and permanence for quota students at UESPI. We opted for bibliographical and documentary research, with a qualitative approach. The investigation was supported by legal frameworks, legislation, theoretical approaches and reflections on historical contexts that deal with educational policies, in the dimension of affirmative student actions. Documentary analysis based on Bardin (1977). The data analysis is organized by defining the base unit of registration and categories. The results sought to answer the specific objectives: 1) to find out about the regulations on the student affirmative action policy at UESPI; 2) to analyse the administrative organizational structure following the implementation of the reservation system; 3) to identify strategies formulated in the regulatory instruments provided for the development of affirmative actions, which imply access and permanence of quota students; 4) elucidate the administrative structure of the composition of the higher education councils and its implications for establishing university policy for students; 5) describe the operational structure of affirmative action materialized in the dimensions of access and permanence; 6) present institutional evaluation and monitoring instruments that contribute to improving the institutionalization of the policy. The data from the Institutional Development Plans - PDI (2012-2016; 2017-2021) and the Institutional Strategic Plan - PEI (2014-2017), reveal that the legal and regulatory apparatus, which guide the practices in the processes of building the institutionalization of student affirmative actions are still embryonic. The understanding of the absence of records in the documents is that affirmative action for students is not an institutional priority, that the meritocracy bias is subtextual in what is not planned. This lack of planning has an impact of internal exclusion and delays the inclusion of black, indigenous, quilombola, disabled and other populations. In addition to the implications of maintaining the percentage of vacancy reservations incompatible with the black population of Piauí and the expansion of specific permanence policies for quota students. We conclude that the progress made in institutionalizing Affirmative Action for Students is taking place in a slow, trickle-down process.
ESG no Brasil: da definição à implementação - uma análise do impacto e aplicabilidade na sustentabilidade empresarial e na indústria de alimentos
(Universidade Federal de São Carlos, 2024-08-30)
Prado, Vitória Cristina Peres do
;
Urban, Roberta Cerasi
;
https://lattes.cnpq.br/7313670290572985
The concept of ESG (Environmental, Social and Governance) is increasingly proving to be a practical necessity for Brazilian companies. In the context of growing sustainability concerns amid finite natural resources and socio-environmental crises, effective management of ESG issues has become essential for corporate sustainability and market competitiveness. We demonstrate how ESG practices, particularly in the food industry, can mitigate environmental impacts, promote sustainable agriculture, and ensure safe and healthy production. Companies such as Citrosuco illustrate how the application of ESG practices can reduce deforestation, pollution, and soil degradation, while also strengthening corporate reputation and accessing new markets. Thus, the implementation of effective ESG practices is no longer optional but a vital necessity for companies aiming to promote corporate sustainability and maintain market relevance. Investments in education, training, and clear policies to ensure ongoing transparency and accountability are also crucial. In conclusion, the continuous evolution of ESG practices is essential for the survival and prosperity of Brazilian companies in a global scenario increasingly focused on sustainability.