Principais Coleções do Repositório
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Saúde mental dos servidores de uma instituição de ensino superior no sul de Minas Gerais e as políticas públicas de gestão de pessoas
(Universidade Federal de Lavras, 2025-03-17) Freire, Diego Cardoso; Navarro, Gabriela Cristina Braga; Simim, Thiago Aguiar; Souza, Mariana Barbosa de
This research investigated people management strategies emphasizing the mental health of Higher Education Institution (HEI) employees in the south of Minas Gerais. The study addresses global advances and transformations and the role of people management in reconciling market changes and coherently transposing them to organizational actors, especially public servants. The focus is on understanding how strategies have been organized and applied in this dynamic context. In turn, this research highlighted how the sector applies public policies within mental health and their impacts on the well-being of workers. The study's general objective is to systematically understand these actions to promote and care for the mental health of these workers, describing existing protocols and proposing improvements based on observed needs. Using qualitative methods, documentary analyses and semi-structured interviews were conducted through content analysis, which highlighted challenges such as a shortage of professionals, work overload, and a lack of a systematized and coordinated structure regarding people management with an emphasis on the mental health of public servants. The research involves four core content categories: challenges in health management, the impact of mental health on the workplace, solutions, and initiatives, and perceptions about illness and retirement. Although initiatives such as training and interdisciplinary partnerships have been proposed, the lack of systematized policies and discussions at the strategic planning level limits their effectiveness. The results suggest expanding the professional framework, integrating preventive practices, and establishing well-defined policies to meet growing demands. In conclusion, despite specific efforts, there are gaps to be filled to consolidate a more humanized, strategic, and effective people management that promotes mental health comprehensively and analytically.
Avaliação de bactérias do ácido lático sobre a conservação de silagens de grãos de milho reidratado
(Universidade Federal de Lavras, 2025-03-05) Garcia, Gabriela Martins; Ávila, Carla Luiza da Silva; Orientador; Carvalho, Beatriz Ferreira; Salvati, Gustavo Gonçalves de Souza Carvalho; dc.contributor.referee1; dc.contributor.referee2; dc.contributor.referee3; dc.contributor.referee4; dc.contributor.referee5
The maize hybrids grown in Brazil have a predominantly vitreous endosperm and therefore have low ruminal starch degradation. Among other processes to solve this problem, ensiling ground and rehydrated corn kernels is an easily accessible option for producers. The use of inoculants in this silage is a practice that can optimize fermentation and improve the aerobic stability of the stored material. The aim of this study was to evaluate the use of different inoculants in rehydrated maize grain silage (RMS). Two commercial inoculants of mixed composition, S1 and S2, the Lentilactobacillus hilgardii (LH) strain, the L. farraginis (LF) strain and the combination of S1+LF, were evaluated. The maize was ground (3 mm), rehydrated to 65% dry matter (DM) and inoculated (108 log CFU/kg). The ground maize was rehydrated and compacted manually (density of 1042 ± 11 kg/m3) in 5L experimental silos. The silos were sealed, weighed and stored for 35 and 98 days. The experiment was conducted in a DBC with 5 treatments (LF, LH, S1, S2 and S1+LF) plus 1 control (no inoculant) with 4 replications (blocks on different days of silo production), totaling 48 experimental units. The data was submitted to analysis of variance (SISVAR®). The means were compared using the Scott Knott test at a 5% probability level. There was an effect of the inoculants on DM, starch, BAL, BAFE and yeast populations, fermentation products and aerobic stability. The lowest pH values were observed in silages inoculated with S1 and S2 (average: 3.87). The lowest starch concentrations were observed in S1, S2 and LF+S1 silages. The most efficient inoculants in reducing the yeast population were LF and LH (< 2.00 log CFU/g). Silages inoculated with LF, LH and LF+S1 showed greater aerobic stability after 35 days of storage. The concentrations of 1,2-propanediol and propionic acid increased with storage time and were higher in silages inoculated with LH and LF. The effect of the inoculants on pH, DM loss, lactic acid bacteria population and acetic acid concentration depended on the storage period. At 35 days of storage there was no difference in DM loss, but at 98 days DM loss was lower in silages inoculated with S1 and S2 (0.81% on average for the group). Inoculation with S1 and S2 reduced DM losses, the concentration of butyric acid and pH and increased the concentration of lactic acid without changing the yeast population. However, the addition of these inoculants reduced the aerobic stability of the silages after 98 days of storage. The combination of S1 with L. farraginis increased the aerobic stability of the silages after 35 days of storage. The combination of lactic acid bacteria inoculants in these silages was capable of altering the fermentation process, lowering the pH, inhibiting undesirable microorganisms and promoting more efficient fermentation.
Produção de animação instrucional de língua portuguesa para os anos finais do ensino fundamental.
(Universidade Federal de Lavras, 2025-02-10) Mappa, Andréa da Silva Brandão; Almeida, Patrícia Vasconcelos; Vieira, Mauriceia Silva de Paula; Brito, Cristiane Carvalho de Paula
It is well known that, during the Coronavirus pandemic, when the Emergency Regime for Non-Face-to-Face Activities (REANP) was implemented, the use of digital technologies among students and teachers grew considerably. In the search for digital material to continue with remote classes, the author noticed a scarce availability of specific animations for teaching Portuguese Language (PL) content for the final years of elementary school (E.F. II). Although there are several studies that address the use of animations in the teaching-learning process, such as Ferreira and Almeida (2018); Silva (2020) and Silva, Lima and Ferreira (2020), the teacher-researcher noticed a gap regarding those that deal with the process of creating instructional animation, specifically considering PL content. Therefore, understanding that this resource is of great value in supporting teachers in their daily practice, this research aims to contribute to teacher training by answering the question: what is needed to produce instructional animations, considering a Portuguese Language planning for students in E.F. II? With this purpose, the general objective was to investigate the contributions of the use of instructional animations as a tool in the teaching-learning process of LP in E.F. II. The specific objectives were: to develop a meta-research on the subject of instructional animation; to analyze institutional animations produced by the teacher-researcher, in light of the cognitive load theory (Sweller, 2008) and the multimedia learning theory (Mayer, 2022); to present the proposal of a guide for the production of instructional animation of a topic of study of the LP content aimed at E.F.II. To achieve these objectives, this research assumed an applied nature, with a qualitative approach and a descriptive and exploratory character. The three most viewed videos produced by the author and published on the internet, on the YouTube platform, during REANP were used in the analysis. The analysis categories were: 1. Cognitive load management strategies; 2. Strategies to increase relevant cognitive load; and 3. Impact of the videos. After the analysis, it was evident that the strategies indicated by CBT (Sweller, 2008) and TAM (Mayer, 2022) were used in the videos examined. Instructional animations are considered to have great potential in the teaching-learning process, but there is still a great challenge for digital technologies to be widely used in the school environment. It is considered that there is still room for future research in this area.
Diversidade de abelhas (Hymenoptera: Apidae) em uma área de cerrado no município de Frutal/MG e estudoe xperimental de Euglossa cordata em área de Mata Atlântica
(Universidade Federal de Lavras, 2025-02-19) Vittori, Gabriel Sterzeck; Carvalho, Stephan Malfitano; Panarelli, Eliana Aparecida; Sobreiro, Ana Isabel
Bee pollination is an essential ecosystem service for the maintenance of plant biodiversity, ensuring plant reproduction, genetic variability, and ecosystem resilience. In the Cerrado, a biome recognized for its high biological diversity and vulnerability to anthropogenic pressures, bees play a crucial role as pollinators and bioindicators of environmental quality. Habitat fragmentation, urban expansion, and the intensive use of agrochemicals negatively impact the diversity and abundance of these insects, thereby compromising the provision of essential ecosystem services. This study analyzed the bee fauna (Hymenoptera: Anthophila) in Cerrado areas, aiming to understand how factors such as forest fragmentation and the loss of natural habitats affect the composition and structure of bee communities. Additionally, the study highlighted the importance of bees as sensitive bioindicators of environmental changes, which enables their use in monitoring anthropogenic impacts and assessing environmental quality. Species diversity and distribution are directly influenced by local conditions, such as the availability of floral resources and nesting sites, being higher in preserved and restored natural areas. The expected results will contribute to understanding the relationship between land-use changes and bee community dynamics, providing support for the development of public policies aimed at the conservation of the Cerrado and the promotion of sustainable practices. The preservation of bee fauna is fundamental not only for maintaining the biome's biodiversity but also for ensuring the continuity of ecosystem services that sustain agricultural production and environmental health. In parallel, a study was conducted with the species Euglossa cordata, aiming to develop a protocol for the management and artificial multiplication of its nests, in order to enable the rational rearing of this species and to promote its use as a pollination agent in agricultural crops such as Vanilla spp.
Compósitos de gesso reforçados com resíduos lignocelulósicos e micro/nanocelulose kraft
(Universidade Federal de Lavras, 2024-08-19) Satiro, Jhonatan Sales; Tonoli, Gustavo Henrique Denzin; Oliveira, Barbara Maria Ribeiro Guimarães de; Tonoli, Gustavo Henrique Denzin; Oliveira, Barbara Maria Ribeiro Guimarães de
Constructive gypsum elements are attractive in civil construction due to their rapid hardening, fire resistance, and acoustic and thermal efficiency. However, due to its porosity and low mechanical efficiency, gypsum use is generally limited to interiors. To improve these properties, reinforcement, such as fibers, is necessary. Reinforcing fibers can be obtained from various sources, including industrial waste, which aligns with the concept of reverse logistics. In this context, the general aim of this study was to evaluate the effect of adding industrial lignocellulosic waste and micro/nanocellulose fibrils derived from kraft paper tubes in gypsum- based composites. The design included incorporating the lignocellulosic material reinforcement in both raw and nanoscale forms at proportions of 0%, 2.5%, 5%, 7.5%, and 10% of the raw material and proportions of 0%, 0.25%, 0.5%, 0.75%, and 1% of the nanoscale material as a gypsum substitute. The specimens were evaluated for water absorption, apparent density, flexural mechanical strength, and thermal properties. A 10% increase in water absorption was observed in composites with residues and an 87% increase in nanocomposites, along with an increase in apparent density with higher reinforcement in the matrix. The composites with this incorporation were favorable for thermal conductivity. Flexural strength showed a decrease with reinforcement incorporation but remained within acceptable standards. The characterization of the micro/nanocellulose gel obtained from the tube waste assessed stability, rheology, and diameter distribution. The reuse of this kraft paper tube waste in gypsum composites proved to be a viable alternative for incorporation into the matrix, contributing to reverse logistics by reusing a material that would otherwise be improperly discarded in the environment, causing various negative impacts and demonstrating new potential applications for the material.