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Síntese, caracterização e aplicação de ligantes geopoliméricos em concretos refratários avançados
(Universidade Federal de São Carlos, 2024-08-09)
Bezerra, Breno Parente
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Luz, Ana Paula da
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https://lattes.cnpq.br/3470395641242374
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https://lattes.cnpq.br/3571098419382941
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https://orcid.org/0000-0002-0193-9373
Alternative binders represent a promising avenue for the development of ultra-low and cement-free refractories, significantly reducing CO2 emissions and the energy consumption associated with these products. Geopolymers (GP) are sustainable binders that can be utilized in the manufacture of these ceramics. However, a comprehensive comparison of systems containing calcium aluminate cement (CAC) or GP is necessary to identify the advantages and limitations of these new materials. In this study, the synthesis, characterization, and application of geopolymers in alumina-based castables were evaluated, aiming to enable the partial or complete replacement of CAC in these refractories. Initially, metakaolin (MK)-based geopolymer systems were formulated using liquid reagents (LR) composed of NaOH and different sources of amorphous silica (sodium silicate, silica fume, or colloidal silica suspension). Subsequently, the most promising LR was chosen, adjusting the content of NaOH and/or KOH to enhance the thermal stability of the geopolymers. Furthermore, the effect of incorporating these new binders into the properties of the refractories was investigated between 40-1400°C through various tests, including flowability, physico-thermo-mechanical measurements, and XRD, ATR-FTIR, and/or SEM analyses. Geopolymers prepared with colloidal silica suspension (CS) exhibited the best characteristics for use in the development of innovative refractories. Alumina-based castables with 8 wt.% MK and LR containing NaOH-CS (8MK-Na) and 6 wt.% MK and LR containing KOH-CS (6MK-K) showed optimized behavior, where the generation of a liquid phase during sintering induced densification of the samples between 1100-1250°C. These transformations resulted in microstructures with strong interfacial bonds between the glassy phase and alumina grains. Additionally, the refractory containing a combination of 2.7 wt.% CAC and 1.3 wt.% MK exhibited 1.18% shrinkage, an elastic modulus of 135 GPa, mechanical strength of 39.1 MPa, and high thermal shock resistance. These advancements resulted in the development of refractories with remarkable performance, surpassing the reference material.
A study of two-echelon routing problems applied to last-mile delivery: formulations and exact methods
(Universidade Federal de São Carlos, 2024-08-09)
Senna, Fernando
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Munari, Pedro
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https://lattes.cnpq.br/1328868140869976
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https://orcid.org/0000-0001-5929-593X
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Morabito Neto, Reinaldo
Vehicle routing in urban environments encompasses additional challenges for logistics services providers due to traffic conditions, city regulations, and difficulty in finding parking locations. To overcome these issues, companies usually adopt alternative delivery systems, such as the ones that are reflected in two-echelon routing problems. These problems are based on the idea of having larger vehicles taking goods from depots to intermediary facilities or parking locations, and smaller vehicles or walking deliverymen taking goods from these points to the final customers. Two examples of such problems are the two-echelon location-routing problem (2E-LRP) and the vehicle routing problem with time windows and multiple deliverymen (VRPTWMD). The first encompasses decisions on vehicle routing in both echelons and the facilities to be opened or used. The latter considers that vehicles may carry more than one deliveryman to increase vehicle efficiency. In this dissertation, we propose improvements for both of these problems, focusing on formulations, valid inequalities, Benders decomposition schemes, and exact solution methods. For the 2E-LRP, two novel formulations are presented and compared to the benchmark one. Their linear programming relaxations and their performance under a mixed-integer programming solver are compared, showing that the novel formulations greatly outperform the benchmark of the literature. Also, 125 new best known lower bounds and 55 new optimal solutions were found for the 131 benchmark instances evaluated. Regarding the VRPTWMD, two realistic extensions of the problem were proposed, incorporating in the optimization the deliveryman routes and the decision on which customers to serve in each vehicle stop, which are usually considered to be preprocessed in the literature. Valid inequalities and Benders decomposition schemes were proposed to develop exact solution algorithms for these new variants of the VRPTWMD. Managerial insights show the importance of applying these variants instead of the common approach from the literature, leading to cost reductions of around 10%.
Sensor fotoeletroquímico para detecção de naproxeno em esgoto utilizando nanocomposto de vanadato de bismuto/óxido de cobre
(Universidade Federal de São Carlos, 2024-08-09)
Badaró, Carolina do Carmo
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Moraes, Fernando Cruz de
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https://lattes.cnpq.br/8597473049054728
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https://lattes.cnpq.br/5079454486243621
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https://orcid.org/0000-0002-1485-8003
Emerging pollutants are chemicals increasingly detected in the environment, often lacking analysis protocols and concentration limits regulated by governmental agencies. Pharmaceuticals are notable among these pollutants, found in sewage, surface water, groundwater, and even treated drinking water, often at very low concentrations but with potential environmental and public health impacts. Sewage treatment plants, though designed to remove various pollutants, may not effectively eliminate these emerging pollutants due to their persistence against conventional treatment processes. This study focuses on detecting naproxen in sewage using a photoelectrochemical sensor developed from the semiconductor material BiVO4/CuO. Morphological, structural, electronic, and electrochemical characterizations were conducted using X-ray diffraction, scanning electron microscopy, diffuse reflectance spectroscopy, and cyclic voltammetry. The sensor exhibited an analytical signal during photocurrent generation simultaneously with naproxen oxidation on the working electrode. Sensor responses were proportional to increased naproxen concentrations in the linear range of 0,02 μmolL-1 to 0,48 μmolL-1, with R2 = 0,997 and a detection limit of 4,90 nmolL-1. Naproxen detection in sewage samples was successfully achieved, with recovery percentages above 95%
A Feira do Beco do Inferno entre um evento e um movimento: juventude e organização política na cena cultural de Sorocaba
(Universidade Federal de São Carlos, 2024-08-09)
Siems, Vânia Gutierres
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Tarábola, Felipe de Souza
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https://lattes.cnpq.br/1607155996690149
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https://lattes.cnpq.br/1893456364486834
This dissertation examines the event “Feira do Beco do Inferno” in Sorocaba, reflecting on its role as a cultural and political expression of individuals and groups organized in the city, as well as a significant cultural and social movement for Sorocaba. The study was motivated by the need to understand in what ways the Fair functions as a space of resistance, expression and social engagement for the youth and other participating groups, being much more than just an artistic celebration. The main objective was to investigate the interactions and the impact the Fair has on the social and cultural context of Sorocaba, particularly regarding the involvement of the Youth and its influence on the local cultural and political dynamics. Using qualitative methodology, the research relied on participant observations, semi-structured interviews and documentary analysis in order to capture the experiences and perceptions of the Fair participants. This approach allowed for a deep immersion in the dynamics of the event and the identification of its contributions to the social and cultural fabric of the city. The results revealed that the Feira do Beco do Inferno is a vital meeting point for young people, providing an environment of crucial development for art, political debate and social activism. The event has established itself as a cultural movement that challenges conservative social norms, promoting inclusion, diversity and civic participation. Through art and cultural expression, the Fair facilitates the dialogue and the reflection on social issues, fostering a sense of community and belonging among the participants. The Feira do Beco do Inferno plays a crucial role in the cultural and social life of Sorocaba’s youth, acting as a facilitating agent for engagement and social change. This study indicates the relationship between cultural spaces such as the Fair and the promotion of active citizenship, and presentes considerations for formulating public policies. Keywords: Cultural Movements; Cultural Collectives; Youth; Sorocaba; Political Action
Caracterização dos genomas do tatu-peba e tatu-canastra e genômica comparativa na superordem Xenarthra
(Universidade Federal de São Carlos, 2024-08-09)
Inforzato, Alexandre Romero
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Freitas, Patrícia Domingues de
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https://lattes.cnpq.br/5647631868534064
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https://lattes.cnpq.br/8837582566960537
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https://orcid.org/0000-0002-9841-656X
This study investigated the genetic diversity and genes under positive selection in xenarthrans using genomes and sequencing data currently available in the public database GenBank (NCBI), focusing on Euphractus sexcinctus (six-banded armadillo) and Priodontes maximus (giant armadillo), whose genome assemblies were produced by the author. For comparative genomics analyses, the novel assemblies of E. sexcinctus and P. maximus were added to the nine existing xenarthran genomes in the GenBank database (Bradypus variegatus, Cabassous unicinctus, Chaetophractus vellerosus, Choloepus didactylus, Choloepus hoffmanni, Dasypus novemcinctus, Myrmecophaga tridactyla, Tamandua tetradactyla, and Tolypeutes matacus), increasing the genomic representation of a clade with only 31 living species and a rich evolutionary history. The genomic characterization revealed challenges in genome assembly, especially for P. maximus, whose low coverage and high fragmentation limited gene content completeness and, consequently, the prediction of expressed proteins. To mitigate this effect, the RagTag v2.1.0 tool was used to reduce fragmentation in several of the assemblies, significantly increasing the prediction of expressed proteins and orthologous genes. For selection analysis, expressed proteins were predicted using the GeMoMa v1.9 tool, single-copy orthologous genes were identified using OrthoFinder v2.5.5, multiple codon alignments were performed with PRANK v.170427, phylogenetic trees were constructed with IQ-Tree2 v2.1.2, and positive selection analysis was conducted with HyPhy v2.5.8, using the BUSTED function. Candidate genes identified as being under positive selection were validated with Xia's substitution saturation test in the DAMBE v7.3.32 software and functionally annotated with the emapper v2.1.12 tool from the eggNOG v5.0.2 package. This led to the identification of 15 genes under positive selection, including keratin (KRT10), which may have conferred evolutionary advantages to xenarthrans. The autosomal heterozygosity analysis showed significant variations among the species. The giant anteater (Myrmecophaga tridactyla) and the giant armadillo (Priodontes maximus), classified as "Vulnerable" by the IUCN, exhibited low heterozygosity, indicating reduced genetic diversity. In contrast, the southern three-banded armadillo (Tolypeutes matacus), although classified as "Near Threatened", displayed high heterozygosity, and the Linnaeus's two-toed sloth (Choloepus didactylus) and Hoffmann's two-toed sloth (Choloepus hoffmanni) – despite being both classified as “Least Concern” – exhibited reduced heterozygosity. The analyses provided detailed data on the genetic diversity and evolution of xenarthrans, contributing to the understanding of these species and their conservation needs.
Perspectivas da digestão anaeróbia na produção de biogás a partir de resíduos orgânicos: uma análise sistemática da literatura
(Universidade Federal de São Carlos, 2024-08-09)
Sacoman, Diego Angelo
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Silva, Edson Luiz
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https://lattes.cnpq.br/9720274214573371
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https://lattes.cnpq.br/1958144604187684
Anaerobic digestion of waste is a research topic that has gained increasing relevance due to its relationship with the topic of sustainability, in the context of the need to deal with organic waste, mainly industrial, which in several countries is discarded in exorbitant quantities causing drastic environmental pollution, in addition to the alternative relying on the production of biogas, especially methane, and bioenergy. Therefore, this work aims to carry out a bibliographical analysis and systematic review of the literature, exploring the concepts of anaerobic digestion and anaerobic co-digestion, the relationship with heterogeneous substrates and their efficiencies. Furthermore, the literature review also analyzes scientific publications on the subject of anaerobic treatment of organic waste, verifying different approaches, observing the most relevant parameters for the treatment and production of biogas. For detailed analysis of scientific studies, the Scopus and Web of Science database will be used. Based on the data presented, we intend to analyze the main topics of study and, highlighting the most cataloged substrates, countries and periods with the largest publications, and conclude whether anaerobic co-digestion is a promising strategy for the treatment of organic waste, to minimize the environmental impact.
Contar para ocultar(-se): o funcionamento do silêncio na/pela formulação de Javier Marías em “Amanhã, na batalha, pensa em mim”
(Universidade Federal de São Carlos, 2024-08-09)
Santos, Júlio César Martins
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Nogueira, Luciana
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https://lattes.cnpq.br/7475342844385424
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https://orcid.org/0000-0003-4470-5005
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https://lattes.cnpq.br/9888692612241549
This Master’s Thesis uses as material for analysis the literary work “Tomorrow, in battle, think on me” (1994), by the Spanish writer Javier Marías (1952-2022). Anchored by the theory of Discourse Analysis, by Pêcheux and Orlandi, it seeks to understand how silence works in/through the author's formulation in this work. Silence and formulation, in turn, are notions that are very important to Discourse Analysis and that were worked on here under the perspective of the work of Orlandi (2012a, 2012b, 2012c, 2015). Divided into three chapters, it refers to a thematic structure that observes fundamental moments for the narrative, namely: Death, Siege and Unveiling. From this organization, a dialogue was established with theory to construct the analysis device in order to relate the passages described in the novel to the conditions of production of the work, that is, to the socio-historical, ideological aspects and constitutive exteriority. In this way, the Excerpts produced focused on recurring linguistic functions, in the syntactic and semantic spheres, such as negation, appositive enumerations and repetitions. Given these Excerpts, it was possible to discuss issues relating mainly to Spanish society in the 20th century, especially with regard to the consequences of the Spanish Civil War (1937-1939), the subsequent dictatorial regime implemented by General Francisco Franco (1939-1975), the democratic transition at the end of the dictatorship and the final decades of the millennium, the period in which the plot develops. Thus, the different types of silence described by Orlandi (2015), namely, founder and the politics of silence – subdivided into constitutive and local silence – appear in the work in order to touch on the still unhealed wounds of the traumatic experiences that occurred in Spain during the last century, since the meanings produced in the tension between telling and not telling refer to the trivialization of violence and death, constant persecution and surveillance experienced over decades of repression in confrontation with the subsequent political openness and the unavoidable change of times brought about by technological revolution announced and actually carried out. The subjects of these times, then, had to deal with these two poles: the trauma of the past and the tension of the future. The Mariasian formulation, characterized by long periods, serves, this time, as an observation and listening post not only for its elaborate imagetic constructions, but also for what it allows us to glimpse through the clues and subtle traces left by silent/in what is silenced.
Desejo, trabalho e agenciamentos: a (des)plataformização do trabalho sexual no contexto brasileiro
(Universidade Federal de São Carlos, 2024-08-09)
Melo, Cristiane Vilma de
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Leite Júnior, Jorge
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https://lattes.cnpq.br/7253561448346772
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https://orcid.org/0000-0001-6234-9169
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https://lattes.cnpq.br/0140071637436804
This thesis sought to understand the (de)platformization of sex work experienced by sex workers at the intersection of the objective and subjective aspects of the digital sex market by condensing categories such as sex work and desire. Specifically, we aim to: a) understand how women who work in the platform-mediated sex market articulate the notion of difference to the production of desire; b) describe how these women define their work in the sex market and the relationship between this universe and the category "sex worker"; c) analyze the ruptures and continuities in the digital sex market based on concepts such as pornification of the self, pleasure, and visibility. Our hypothesis points to an extrapolation of the category of sex work, the digitally mediated construction of which creates a grammar of desire related to the sexual incitement of those who produce, search, and consume, as well as creating identity and agency processes that interpellated the category of "woman" as a desiring subject. The methodology was based on bibliographical and documentary research, interviews, and digital and multisited ethnography.
Professores do Atendimento Educacional Especializado em atividade de ensino do conceito de número: uma perspectiva a partir da Teoria da Atividade
(Universidade Federal de São Carlos, 2024-08-09)
Criminazzo, Mariana Aparecida Mesquita
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Lozano, Daniele
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https://lattes.cnpq.br/6775248941851933
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https://orcid.org/0000-0002-2379-5403
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https://lattes.cnpq.br/3009227821659794
The aim of this research was to investigate how Specialized Educational Assistance (SEA) teachers organize their teaching so that students appropriate the concept of number. Specifically, based on the answers to a questionnaire and a fictitious case it aimed to develop, apply and evaluate a training proposal for these teachers, based on the assumptions of the Teaching Guiding Activity (TGA), whose elements are referenced in Leontiev's Activity Theory. In this way, we were able to verify, using some categories of Dialectical Historical Materialism and Cultural-Historical Theory, how the theoretical and practical contributions influenced the transformation and appropriation of the teachers' conceptual thinking. The data suggests that the teachers' knowledge was related to the external links of the concept, by proposing activities primarily focused on tracing the numbers and recognizing the graphic symbol associated with the quantities, which also revealed a lack of conceptual knowledge. The analyses showed that this research played its part in contributing to, if not breaking with practices based on the hegemonic knowledge of formal logic, at least raising important questions about the intentional organization of the teaching of the concept of number, because by knowing the logical-historical movement of this concept, it is possible to reveal what formal logic strives to hide. In addition, the data presented in this study shows us the urgent need for this type of knowledge on the part of education professionals, as well as a greater depth in the appropriation of some of the concept's links, such as Grouping, Base of the Decimal Numbering System and Positional Value.
Projeto de Vida no ensino médio: currículo oficial e currículo em ação em escolas do Programa Ensino Integral do estado de São Paulo
(Universidade Federal de São Carlos, 2024-08-12)
Mello, Sonia Regina Moraes de
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Nascente, Renata Maria Moschen
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https://lattes.cnpq.br/3742955383665134
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https://lattes.cnpq.br/8528018788675751
The investigation that gave rise to this dissertation was developed within the scope of the Study and Research Group on School Organization: Democracy, Human Rights and Manager Training – DEFORGES. The problem investigated is the following question: how do teachers perceive the implications teaching of the Life Project subject in the training of high school students in Comprehensive Education Program (PEI)? The general objective was to characterize these perceptions within the scope of this subject, in high school, in three PEI schools in the southwest of the São Paulo state. The specific objective was to investigate how teachers understood student improvement from the curricular perspective of the Life Project subject. The methodology used was education research qualitative exploratory, using document analysis, semi-structured interviews and classes observations as research instrument. The results obtained showed that teachers were not clear about the curriculum plan of the Life Project subject. Furthermore, teachers found it difficult to carry out school work and, sometimes, the teaching becomes unfeasible. In addition, education professionals pointed out the disconnection between the guidelines, the materials prescribed by the São Paulo State Department of Education (SEDUC-SP) and the real conditions for the development of this subject. The results also showed that the intentions of these guidelines and materials seem to be purposefully related to the qualification of labor for the job market in the current neoliberal context.
Controle da poluição do ar por filtração híbrida de material particulado proveniente da indústria siderúrgica
(Universidade Federal de São Carlos, 2024-08-12)
Araújo, Deisy Teles de
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Castro, Bruno José Chiaramonte de
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https://lattes.cnpq.br/9306599334757765
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Aguiar, Mônica Lopes
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https://lattes.cnpq.br/0431688649128529
The transmission of specific material by industry poses a serious threat to the environment and human health. The World Health Organization (WHO) World Health Statistics report of 2018 revealed that air pollution was involved in approximately 7 million premature deaths worldwide by 2016, and data from 2022, also from the WHO, showed that more than 99% of the world's population breathes the air that is considered unhealthy. A promising alternative to control air pollution is the hybrid filter. These filters combine traditional gas and solid particle separation equipment, such as electrostatic precipitators and bag filters, in a single device. This project aims to analyze the performance of hybrid filtration in relation to collection efficiency, cake porosity, filtration time and pressure drop in a bench-scale equipment, at different electric field intensities applied to the precipitator. The superficial filtration velocity in the system was 0.047 m.s-1 (2.8 m.min-1) and in the electrostatic precipitator it was 0.74 m.s-1. The electric fields applied to the electrostatic precipitator were 0.0, -2.0 and -4.0 kV.cm-1. The particulate materials tested were phosphate rock and sintering dust, the latter coming from the hoppers of an industrial bag filter. The filter materials tested were polypropylene (PP) and polyester (PE). As a result, as the voltage applied to the precipitator increased, an increase in the collection efficiency was observed in the precipitator and in the filter, causing the efficiency in the hybrid filter to reach values of 100% for some operational conditions investigated. The filter material that presented the best collection efficiency for the tests performed with phosphate rock was polypropylene, while for the sintering powder, both filter materials presented good performance. The porosity values for the sintering powder were similar to both the polypropylene and polyester filtration tests. However, when considering phosphate rock, it is recommended that the tests with polyester resulted in higher porosities than those with polypropylene. The longest filtration time to reach the pressure drop of 100 mmH2O in the hybrid filter tests occurred under the conditions of greatest eclectic field applied to the precipitator. For industrial filters, this result can be translated into a lower frequency of cleaning pulses in the bags, and, consequently, a longer useful life, reducing the costs with the total bag replacement.
Sensor eletroquímico descartável para detecção de glifosato aplicado no campus Lagoa do Sino da UFSCar
(Universidade Federal de São Carlos, 2024-08-12)
Marote, Luca Calçada D'Olim
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Martensen, Alexandre Camargo
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https://lattes.cnpq.br/1608659358382981
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https://orcid.org/0000-0001-9017-7480
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Vicentini, Fernando Campanhã
Due to the panorama of intensive consumption of pesticides in Brazil, the environmental impacts linked to the transportation, pollution and contamination of ecosystems by such compounds stand out, whose effects can present, in many situations, considerable adversity to environmental and human health. The non-selective herbicide glyphosate is the most widely used pesticide in the world and is presented in several studies as a contaminant of water bodies, so that methods that seek to detect it in environmental contexts are pertinent, especially through quick and simple strategies. In this sense, electrochemical sensors are advantageous due to the versatility of miniaturization and ease of operation, with emphasis on the applicability of disposable printed electrodes in the detection of various types of analytes. Thus, the present work consisted of developing a disposable electrochemical sensor, using screen printed gold electrodes, to detect glyphosate in real water samples, which were collected in water bodies near rainfed agriculture areas of the Lagoa do Sino campus of the Federal University of São Carlos, where the herbicide was sprayed. In addition, samples of rainfed plants were collected and washed with distilled water to verify the presence of the herbicide and evaluate the performance of the sensor in this situation. For this purpose, screen printed gold electrodes were employed using the square wave voltammetry technique in a linear range from 0.1 to 10 μmol L−1 of the herbicide with a detection limit of 0.057 μmol L−1. The tests of water samples from the lakes showed current increases precisely in the oxidation potential of glyphosate (0.8V), comparing the samples collected before and after spraying of the pesticide, which suggests that there was drift and pollution of water bodies. In addition, a significant signal of glyphosate was obtained in the water sample referring to the washing of the surface of the plants, attesting to the efficiency of the electrochemical sensor in the detection of the herbicide.
Descrição sintático-semântica de nomes predicadores em tweets do mercado financeiro em português
(Universidade Federal de São Carlos, 2024-08-12)
Barbosa, Bryan Khelven da Silva
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Di Felippo, Ariani
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https://lattes.cnpq.br/8648412103197455
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https://orcid.org/0000-0002-4566-9352
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https://lattes.cnpq.br/8007703579388553
In this study, the argument structure (A-structure) of predicative nouns (Npred) occurring in the financial market tweet corpus DANTEStocks was described, given the preference for using this type of predicator in digital genres of this domain. The specific objective was to verify: (i) the presence/absence of arguments (Arg) in the tweets, (ii) the syntactic realization of Args, and (iii) the influence of linguistic phenomena in tweets on the realization of the A-structure of the nouns. Specifically, 145 Npreds and 1,756 instances (tweets with at least one Npred) from the corpus were described at the syntactic-semantic level. Syntactically, semi-automatic annotation of the entire DANTEStocks was carried out according to the Universal Dependencies (UD) model. At the semantic level, syntactic dependency trees guided the manual annotation of instances according to NomBank. The syntactic-semantic mapping revealed that: (i) the A-structure of valency one (V1) Npreds is always filled in syntax, (ii) the A-structure of Npreds with V>1 shows some missing Args, (iii) most analyzed Npreds are of V3, with only 2 Args in most instances, (iv) the deprels most frequently connecting Npreds to their Args are nmod and amod, and (v) the syntactic realization of the A-structure in 24 instances was reduced by tweet-specific phenomena (truncation and juxtaposition of elements). These results enrich the descriptive framework of lexical aspects of the language in financial market tweets. Moreover, the syntactic-semantic valency description of Npreds was systematized in NounBank.DS, an online lexical repository that can support further linguistic-computational research. A contribution to Natural Language Processing (NLP) is the UD-syntactic annotation of DANTEStocks, which led to the creation of the first Portuguese tweebank. This resource enabled the development of the first UD-parser of UGC for this language. The NomBank-like semantic annotation of a portion of the corpus also generated a significant resource. Thus, this study produced reference linguistic resources and a tool (parser) for the automatic processing of Portuguese tweets, which are essential for developing NLP applications targeting this type of UGC.
Análise numérica do desempenho mecânico de ligações feitas com barras de fibra de vidro em estruturas de madeira
(Universidade Federal de São Carlos, 2024-08-12)
Penteado, Lucas Dellosso
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Christoforo, André Luis
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https://lattes.cnpq.br/7623383075429186
;
https://orcid.org/0000-0002-4066-080X
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https://lattes.cnpq.br/4707332128291799
In line with technological advances, the construction industry around of the world has sought more efficient construction systems in relation to aspects such as increased productivity, reduced material waste and meeting growing demand. The combination of wood with current technologies allows the use of this material in large structures, both in the idealization of modern projects and in the development of structural projects. Large structures, in height or in span, require structural elements with large transversal extensions generating connections between the elements. Therefore, connections have become an important and common element when wood is used as a structural element. This research analyzed the behavior of a wooden structure connection numerically when replacing traditional metallic connectors by connectors made from fiberglass bars (GFRP). A numerical simulation stage was carried out, with the purpose of calibrating a numerical model based on the results obtained in connection tests, using the Abaqus software. After securing the model, carry out a parametric study varying the following characteristics of the connections: (a) Diameter of the GFRP pins, (b) Number of pins, (c) Geometric characteristics of the connection and (d) Wood species. With the parametric study carried out, a multiple variable regression model was proposed to estimate the ultimate strength in connections, which presents a Correlation Coefficient (R²) of 75.64%. The proposed model was compared with the accuracy of the Johansen model and it was obtained that the Johansen model overestimates the rupture force values by up to 56% when compared with the values found by the proposed model. This situation is justified because the proposed model by Johansen overestimates the values of ultimate force in favor of safety.
Efeitos da microestrutura, direção de construção e formação de defeitos nas propriedades de flexão e desgaste do aço ferramenta H13 processado por fusão em leito de pó a laser
(Universidade Federal de São Carlos, 2024-08-13)
Oliveira, Adriel Pugliesi de
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Bolfarini, Claudemiro
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https://lattes.cnpq.br/9231627080617037
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https://orcid.org/0000-0002-3099-3694
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Gargarella, Piter
Additive manufacturing (AM) has shown promise to produce complex parts. Molds and dies fit these characteristics and are therefore difficult to machine, resulting in significant material waste. To apply AM in the manufacture of these parts, it is essential to explore how the primary materials used in these tools behave after processing. This study investigated how H13 tool steel processed by laser powder bed fusion behaved during bending and wear tests, correlating this behavior with microstructure, build direction, and formed defects. The microstructure revealed a cellular morphology of martensite surrounded by retained austenite. The bending tests demonstrated a high sensitivity to intrinsic process defects and little sensitivity to the part's build direction (BD). The sample fabricated with 400J/mm³ showed the highest values of density and bending stress. In contrast, the sample produced with 600J/mm³ exhibited fewer defects and more extensive deformation before fracture. During wear tests, the printed samples displayed a Coefficient of Friction (COF) between 0.72 and 0.85, while the printed and heat-treated samples showed a reduced range of 0.72 < COF < 0.76. The specific wear rate (K) did not vary significantly with BD but was lower for the printed samples (1.2 x 10^-4 mm³/N·m) compared to the conventionally processed sample (2.2 x 10^-4 mm³/N·m). These behaviors were explained by considering the microstructural refinement, the fraction of retained austenite, the intrinsic tempering of the process, wear mechanisms (abrasion, adhesion, and delamination), and the presence of defects. The findings indicate the possibility of manufacturing H13 parts with complex geometries, maintaining excellent wear properties even before heat treatment.
Perspectivas pód-Pandemia de COVID-19: Previsão do desemprego no Brasil com o méttodo de Holt-Winters
(Universidade Federal de São Carlos, 2024-08-13)
Silva, Adriana Eva Fernandes da
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Moura, Maria Sílvia de Assis
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https://lattes.cnpq.br/9410151859448447
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https://lattes.cnpq.br/4385255495357139
This study aims to analyze the impact of the COVID-19 pandemic on unemployment rates, with a special focus on the gender gap. Using time series methods, we will focus our attention on understanding how the pandemic has affected unemployment. We will employ the Holt-Winters exponential smoothing method to make predictions about the behavior of the time series related to men and women. We will then compare these predictions with the actual data to assess the accuracy and consistency of the projections made. This work seeks to provide valuable insights into the nuances of the impact of the pandemic on unemployment, especially with regard to gender differences.
Circo de rua: estudos geográficos com artistas do litoral sul de São Paulo-SP
(Universidade Federal de São Carlos, 2024-08-13)
Grigolon, Lais Manesco
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Bernardes, Antonio Henrique
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https://lattes.cnpq.br/6785212671844982
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https://lattes.cnpq.br/5161591820450069
In order to understand the distribution of street circus artists on the streets of municipalities on the south coast of São Paulo, how they are organized territorially and their dynamics, both internally and in relation to other groups and institutions, this research was developed using ethnography as the preponderant methodology, with Geertz (1978) recommendations as its main reference. Based on ethnography, different techniques were selected, such as participant observation and the frequent use of field diaries. During fieldwork, collaborators proved to be relevant to understanding the group's dynamics and were invited to contribute to semi-structured interviews, which aimed to deepen the understanding of the data produced in previous stages. With this material gathered, frequent re-readings were carried out, both of the field diaries and the interview transcriptions and the recurrences and relevance of data (events and characteristics described) were noted so that they would form part of the final work, stitching together field experiences, testimonies of artists and the researcher's reflections and other references gathered throughout the process in a narrative that describes the research. The work made it possible to understand the main points of circus activities in the studied area, as well as the motivations or constraints of their territorial dynamics. Furthermore, prolonged contact with the group produced an extensive description of how circus practices have adapted and transformed, along with other social and cultural movements, characteristics that also reflect the ways in which the group appropriates, acts and dominates certain territories. Another relevant point was understanding that the local dynamics of the street circus is supported by a broad network of communication and solidarity, in which artists from different locations are included who strengthen themselves to reproduce their ways of being in the world, as well as sustaining its multiple territorializations.
Fanzines como instrumento de expressão atrás das grades: processos educativos através da arte
(Universidade Federal de São Carlos, 2024-08-13)
Frasson, Tamires Fernanda Baptista
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Fonseca, Débora Cristina
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https://lattes.cnpq.br/8595226338503481
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https://lattes.cnpq.br/5706519197928452
In thinking about possibilities for dialogic learning inside spaces of restriction and deprivation of liberty, the proposal of this paper focuses on a pedagogical action that can promote autonomy for people in this situation: the production of fanzines. This theme was chosen due to the combination of Arts and Language. Therefore, the purposes of this research are: to investigate the educational processes that emerge from the production of fanzines during learning workshops held with students in a space of restriction and deprivation of liberty; analyze fanzines as a pedagogical resource used in school and non-school activities and explore ways to apply it; identify how fanzines can provide moments of self-expression and contribute to the process of humanization of the workshop participants; evaluate the creations made in the workshops and, based on them, promote a meaningful learning for the incarcerated students. Thus, bibliographical research was used in the first stage, conducting a systematic review of the topic. Considering that the stance adopted for this study is grounded on Paulo Freire’s principles, which means, humanizing and liberating, in order to answer the questioning raised by the research, it was exercised in the fieldwork the interaction and relationship of proximity between the researcher and the participants, based on affectivity and dialogue. That way, as a second stage, an action research was carried out with learning workshops at the resocialization center located in Jaú, São Paulo, during Art lessons with two multi graded classes of middle school. From the development of the workshops, it was possible to obtain data on the educational processes emerging from art, such as: autonomy, development of self confidence and trust in others, dialogicity, attention, interest, dedication, motivation, frustration, respect for differences and creativity. Furthermore, the research presents the potential for expression, humanization and the promotion of learning behind bars through fanzine productions. In this research we also found that there are few works on fanzines in these spaces. Therefore, we consider that it is necessary to give more importance to the topic, as it proved to be relevant in its results. We hope that this work will be read not only by people in the academic field. But, mainly, that it reaches people who are deprived of their freedom, inspiring them and showing them new paths through art.
FolheaRR: um córpus compartilhado de textos jornalísticos roraimenses
(Universidade Federal de São Carlos, 2024-08-13)
Gonçalves, Lana Camila Santos
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Procópio, Eliabe dos Santos
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https://lattes.cnpq.br/0792658591244187
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https://orcid.org/0000-0002-9766-1686
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Biazolli, Caroline Carnielli
This study is based on concepts from Variationist Sociolinguistics (Labov, 2008 [1972]), notions about the correlation between variation and textual-discursive genres (Biazolli, 2010, 2016, 2018; Vieira, 2019; Biazolli; Berlinck, 2021a), discussions on the plurality of norms in Brazilian Portuguese (Faraco, 2008, 2012; Bagno, 2011), and the importance of journalistic texts for sociolinguistic studies (Biazolli, 2010, 2016; Vieira; Lima, 2019; Lima, 2022). These theoretical notions support the general objective of constructing samples of journalistic texts from Roraima, published in the newspaper Folha de Boa Vista (FBV). Among the specific objectives are: I) organizing and detailing criteria for the construction of target samples; II) contributing to discussions on the educated written modality of Brazilian Portuguese, aiming at the initial characterization of educated written Portuguese from Roraima; and III) contributing to the advancement of sociolinguistic studies, including Roraima studies in the analyses of Brazilian Portuguese. FBV is the main communication vehicle of Roraima, and due to the lack of studies describing Roraima Portuguese, the sociocultural and scientific relevance of using this material as a source of language data extraction is emphasized. The constitution of the samples – which, together, form the corpus called FolheaRR –, has five textual-discursive genres: article, chronicle, news, report, and opinion comment. For the constitution of the corpus, this study follows specific guidelines determined by this research and methodological guidelines already established in a larger project, conducted at the national level. After the constitution of the corpus, this work carried out the systematization of independent variables associated with each textual-discursive genre and, based on this, proposed a sociolinguistic analysis suggestion focusing on the lexicon – so that other researchers are encouraged to research linguistic uses at this level, or at other levels of the language, in the present corpus. Thus, through the development of the material and the sociolinguistic factors involved, the potential of FolheaRR for the sociolinguistic study scenario in Roraima became evident.
"Foi o trabalho que apareceu”: experiências de jovens mulheres na limpeza escolar
(Universidade Federal de São Carlos, 2024-08-13)
Libâneo, Flávia Sabina
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Corrochano, Maria Carla
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https://lattes.cnpq.br/7714353975585252
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https://orcid.org/0000-0001-8030-6461
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https://lattes.cnpq.br/6845626229842749
This research aims to describe and analyze the experiences of young women inserted in the Young Apprentice Program, who work in the municipal schools of Sorocaba/SP in cleaning functions. Considering the educational and work character present in this labor insertion program, the specificities, difficulties and easiness found in this first job experience were observed. The Young Apprentice Program is aimed at young people from 14 to 24 years old, however, for the cleaning assistant course, the minimum age is 18 years. Thus, the young women participating in this research are in the age group between 18 and 24 years. Considering the scarce academic production found in bibliographic research on cleaning professionals in education, in addition to the lack of knowledge of other education professionals about these young women inserted in school, this research is necessary. Given its qualitative nature, a bibliographic survey was carried out, in addition to the application of 21 sociodemographic forms for profile survey and in-depth interviews with 06 young people for a better understanding of their experiences and trajectories. The interviews were conducted in two stages: the first during the first half of 2023, in person or remotely, according to the availability of the young women, and the second in January 2024, for further study. The theoretical framework is centered on the following authors: Maria Carla Corrochano, François Dubet, Helena Hirata and Patricia Hill Collins. Among the main results obtained, the idea of “a work that was available” and not chosen stands out; the use of this experience as a way to achieve better positions in the labor market; the need to consider non-teaching workers in schools as educators and the markers of gender, age, race and social class, corroborating with research that indicates that poor and racialized women are the majority in domestic work.