Repositório UFSCar

O Repositório Institucional da UFSCar (RI UFSCar) é um sistema de informação que visa armazenar, preservar, organizar e disseminar amplamente a produção intelectual dos diversos setores e segmentos da comunidade da UFSCar, provendo o acesso aberto à informação produzida na instituição e registrada como científica, tecnológica, didática, artístico-cultural e técnico-administrativa.

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Adsorção de anti-hipertensivos do meio aquoso por biocarvões preparados de resíduos vegetais após estudos de predição e priorização de fármacos
(Universidade Federal de São Carlos, 2026-02-06) Ramos, Jonatas Luiz; Carrilho, Elma Neide Vasconcelos Martins; http://lattes.cnpq.br/5147872007117167; http://lattes.cnpq.br/3267481330894295; Gonzalez, Mario Henrique; Kamogawa, Marcos Yassuo; http://lattes.cnpq.br/4080483059878501; http://lattes.cnpq.br/0491659458571556
Pharmaceutical compounds have been widely detected as emerging contaminants (EC) in aquatic environments, standing out for their persistence, low biodegradability, and potential risks to health and ecosystems, even at low concentrations. Approximately 80% of global wastewater does not receive adequate treatment, contributing to the continuous release of these compounds, since part of the administered doses is excreted unchanged or as active metabolites. Among alternative technologies, biosorption has stood out for its efficiency, low cost, and sustainability. In this context, the present work proposed a systematic step for predicting and prioritizing pharmaceuticals, based on the integration of criteria of environmental occurrence, toxicity, and consumption data, to identify and select compounds of greater environmental relevance in the state of São Paulo. From this process, the antihypertensive drugs methyldopa (MDP) and doxazosin (DOX) were selected. For their removal, carbonaceous biosorbents, CL and BC, were developed from yeast residues and cork powder, respectively, which were modified with magnetic nanoparticles (NP), resulting in the magnetic bionanocomposites CL-NP and BC-NP. The materials obtained were characterized by FTIR, XRD, SEM, and determination of the pH at the point of zero charge (pHPZC). Batch adsorption tests evaluated the effects of solution pH, contact time, biosorbent dosage, and sorption capacity. The results indicated that sorption was favorable across the entire pH range investigated (6-10), and that a dosage of 0.5 g L–1 showed the best performance in the tests. Equilibrium was reached in approximately 30 minutes, with a better fit to the pseudo-second-order kinetic model, suggesting a process predominantly controlled by chemisorption. Sorption capacities ranged from 7.48 to 38.76 mg g–1, and equilibrium data indicated the presence of heterogeneous surfaces. Therefore, the developed biosorbents demonstrated high potential in removing the prioritized pharmaceuticals, highlighting the importance of the prediction and prioritization step, and reinforcing the viability of using agro-industrial waste as an efficient, accessible, and environmentally sound strategy for treating contaminated water.
Promoção da qualidade de vida na fibromialgia por meio do exercício físico: perspectivas biopsicossociais e contribuições metodológicas
(Universidade Federal de São Carlos, 2026-02-06) Pontes-Silva, André; Avila Vera, Mariana Arias; http://lattes.cnpq.br/5905617922199364; https://orcid.org/0000-0002-5081-5326; http://lattes.cnpq.br/3835052088266167; https://orcid.org/0000-0002-3983-5342; Avila Vera, Mariana Arias; Cabido , Christian Emmanuel Torres; Serrão, Paula Regina Mendes da Silva; Maciel, Erika da Silva; Matos, Areolino Pena; http://lattes.cnpq.br/5905617922199364; http://lattes.cnpq.br/9102119601757395; http://lattes.cnpq.br/2917658715637353; http://lattes.cnpq.br/4324558006376964; http://lattes.cnpq.br/5013499072708263
Introduction: Fibromyalgia is a chronic, multifactorial musculoskeletal condition of high clinical complexity, characterized by widespread pain, fatigue, sleep disturbances, mood alterations, and substantial functional impairment. Although physical exercise is widely recommended as a nonpharmacological intervention, important gaps remain regarding optimal prescription parameters, comparisons between training intensities, the validity and specificity of diagnostic instruments, the integration of the biopsychosocial model, and factors associated with adherence to nonpharmacological treatment. Objectives: This thesis aimed to: (1) compare fibromyalgia symptoms with those of other chronic musculoskeletal pain conditions using instruments proposed by the American College of Rheumatology; (2) compare the effects of 24 sessions of resistance training with progressive versus constant intensity and walking on fibromyalgia impact and secondary clinical outcomes; (3) investigate biopsychosocial variables associated with social support, self-care, and fibromyalgia knowledge; and (4) examine clinical, sociodemographic, and social variables associated with exercise adherence in women with fibromyalgia. Methods: Four studies were conducted: one randomized controlled clinical trial, two cross-sectional studies, and one cohort study. Participants were adults diagnosed with fibromyalgia according to the 2016 criteria, predominantly physically inactive women. The interventions included resistance training with progressive intensity, resistance training with constant intensity, and moderate-intensity walking. Self-reported outcomes were assessed, including fibromyalgia impact, sleep quality, anxiety, depression, pain, perceived improvement, and treatment adherence. Pain mechanisms were evaluated through temporal summation, conditioned pain modulation, and cutaneous sensory thresholds. Musculoskeletal performance was assessed using isokinetic dynamometry and handgrip strength, in addition to walking ability. Statistical analyses included mixed linear models based on the intention-to-treat principle, logistic regression analyses, analyses of variance, and effect size calculations. Results: The instruments used to assess symptoms adequately discriminated individuals with fibromyalgia from those with other chronic musculoskeletal pain conditions and should not be applied outside this specific context. Twenty-four sessions of resistance training with progressive intensity did not result in greater reductions in fibromyalgia impact compared with constant-intensity resistance training or walking. All exercise modalities produced significant improvements across multiple clinical and physiological outcomes; however, these changes did not reach minimal clinically important differences. Resistance training with progressive intensity led to significant improvements in musculoskeletal performance, particularly in knee extension strength. Exercise adherence was low after three months without supervised intervention. Social support emerged as the primary protective factor for physical activity adherence. Social variables explained meaningful proportions of the variance in social support, self-care, and fibromyalgia knowledge scores. Conclusion: Physical exercise, regardless of modality or intensity progression strategy, provides clinical and physiological benefits for individuals with fibromyalgia; however, these benefits are insufficient to produce sustained, clinically meaningful changes. Different exercise modalities induce similar biological adaptations, highlighting the relevance of total workload and applied effort rather than specific training strategies. Treatment adherence remains a major challenge and is strongly associated with social factors, particularly social support. These findings underscore the need for an integrated biopsychosocial approach to the diagnosis, assessment, and nonpharmacological treatment of fibromyalgia.
Eventos adversos na vida escolar de crianças e adolescentes: uma pesquisa bibliográfica exploratória
(Universidade Federal de São Carlos, 2024-09-13) Santos, Raniele Silva; Bozzini, Isabela Custódio Talora; http://lattes.cnpq.br/0853746645322544; http://lattes.cnpq.br/7334165373557360
This study sought to identify which adverse experiences, which correspond to sources of stress that may include physical, sexual and emotional violence, that children and adolescents experience and what the consequences are for school learning, through an exploratory bibliographical research. To carry out this study, it was defined by searching for scientific articles indexed in the Scielo database, in the time frame from 2015 to 2024, 07 scientific articles were analyzed. It was possible to demonstrate in the study that children and adolescents are inserted in environments in which they are exposed to various adverse experiences, the most experienced being physical and emotional violence, and are impacted by traumatic exposure both in the family environment and in the community. It is concluded that more in-depth studies based on data collection are necessary to understand the real consequences on the school learning of children and adolescents.
Indicadores visuais da qualidade do solo: subsídios para um guia prático ao agricultor familiar
(Universidade Federal de São Carlos, 2025-12-17) Oliveira, Jessica Gomes Siqueira de ; Melloni, Rogério; http://lattes.cnpq.br/4576573849504887; Silva, Reginaldo Barboza da ; http://lattes.cnpq.br/1040231842718937; https://lattes.cnpq.br/7542779599867867; Bianchini, Flávio Gabriel ; Godoy, Leandro José Grava de ; http://lattes.cnpq.br/4178478588502700; http://lattes.cnpq.br/9831205224076878
Soil quality is essential for the sustainability of ecosystems and the maintenance of productive systems, and is directly influenced by use and management. Visual indicators have emerged as practical, accessible, and low-cost tools, providing rapid diagnoses of the physical, chemical, and biological conditions of the soil. This study aimed to select and evaluate the sensitivity of these indicators under different types of use or management in the Sorocaba and Middle Tietê River Basin and organize the information into a practical guide for family farming. Three environments with different use pressures were examined—native forest (MT), agroecological agroforestry system (SAF), and degraded pasture (PAST)—located in the municipality of Araçoiaba da Serra (SP). The visual analysis considered indicators such as color and odor, compaction, infiltration, root development, susceptibility to erosion, presence of macrofauna and litter, stoniness, soil cover, and effervescence in hydrogen peroxide. These indicators were complemented by laboratory parameters, enabling greater precision in interpreting sensitivity to management practices. The results demonstrated that the visual indicators clearly respond to the differences between the evaluated systems, showing strong complementarity with the laboratory analyses, especially those related to organic matter and soil structure. Visual and analytical indicators showed sensitivity to usage pressures, clearly distinguishing between environments: native forest showed better quality, SAF indicated consistent recovery under agroecological management, and pasture showed marked physical and biological degradation. Visual methods proved to be efficient, fast, and low-cost, establishing themselves as effective tools for monitoring soil quality and expanding diagnostic capacity in contexts with limited resources. Based on these results, the illustrated guide “Visual Diagnosis of Soil Quality: A Practical Guide for Family Farmers” was developed, which systematizes field procedures, facilitates their application by producers, and encourages the adoption of conservation practices.
Comportamento mecânico e resistência à corrosão de juntas soldadas de aços inoxidáveis lean duplex 2101 (S32101): uma análise comparativa dos processos GTAW e GTAW dupla fusão
(Universidade Federal de São Carlos, 2024-04-26) Lambertucci, Gustavo Ometto; Magalhães, Danielle Cristina Camilo; http://lattes.cnpq.br/5486724956564584; https://orcid.org/0000-0001-5857-4902; Rovere, Carlos Alberto Della; http://lattes.cnpq.br/8141224513975606; https://orcid.org/0000-0003-1534-0561; http://lattes.cnpq.br/0582510737085045; https://orcid.org/0009-0003-9666-7669; Afonso, Conrado Ramos Moreira; Filho, Anibal de Andrade Mendes; http://lattes.cnpq.br/2176215981291453; http://lattes.cnpq.br/4033093647135538; https://orcid.org/0000-0001-7505-8467; https://orcid.org/0000-0002-6230-8196
Recently, duplex stainless steels are used in many applications involving corrosive atmospheres in combination with the need for high mechanical strength. These steels have a microstructure with a volumetric fraction of ferrite / austenite in the ratio of 1:1, which provides good mechanical properties compared to traditional ferritic or austenitic stainless steels. However, in welding processes, exposure to high temperatures alters the balance of these two phases and simultaneously promotes the supply of harmful phases. In this work, lean duplex stainless steels of class S32101 were used welded using the GTAW and GTAW-DF (double fusion) processes. The studied material is a representative of the “lean duplex” category, where Ni and Mo from conventional duplex steel (S32205) are partially replaced by Mn and N. The objective of this work was to evaluate the effect of process variation on the properties of the welded joint since the difference between the GTAW process and the GTAW-DF is due to the fact that there is a second heat input due to the second torch welding synchronously on the opposite side in the GTAW-DF process, which can increase the formation of harmful phases. The evolution of the microstructure in the heat-affected zone (HAZ) and the weld was evaluated by optical microscopy and the mechanical performance was evaluated through tensile, hardness, impact and bending tests, in addition to pitting corrosion tests. With the results of this study, it was possible to verify the increase in austenite and nitrides in the HAZ of the GTAW-DF process, without significant losses in the corrosion test and mechanical tests. Conventional GTAW was shown to be less reliable than GTAW-DF as it showed porosity in the radiography test and cracks in the bending test. Despite the thermal effects of GTAW-DF, it was evaluated more reliably and the effects were compressive for welding joints in this material.