Fortalecimento da agricultura familiar no sudoeste de Goiás

Orientador: Pedro Jose Steiner NetoMonografia (Especialização) - Universidade Federal do Paraná, Setor de Ciências Sociais Aplicadas, Curso de Especialização em Finanças Corporativas

O reconhecimento de existências lésbicas e a lesbofobia no ensino superior

This article resulted from a master's research that investigated lesbophobia in higher education. The data were produced by a bibliographic survey on the theme, by participation in groups related to the issue and by narrative interviews with university women who identify themselves as lesbian or bisexual. Theoretical dialogues took place with authors from the field of lesbians in a post-structuralist perspective. We perceive that in the university, the processes of recognition of lesbian experiences and lesbophobia are precarious, indicating that it is necessary to question the limits of an education that proposes itself to be democratic, participatory, and not heteronormative.Este artículo resultó de una investigación de maestría que investigó la lesbofobia en la educación superior. Los datos fueron producidos por una encuesta bibliográfica sobre el tema, por la participación en grupos relacionados con el tema y por entrevistas narrativas con mujeres universitarias que se identifican como lesbianas o bisexuales. Diálogos teóricos tuvieron lugar con autores del campo de las lesbianas en una perspectiva postestructuralista. Percibimos que en la universidad, los procesos de reconocimiento de las experiencias lésbicas y la lesfobofia son precarios, lo que indica que es necesario cuestionar los límites de una educación que se proponga ser democrática, participativa y no heteronormativa.  Este artigo resultou de uma pesquisa de mestrado que investigou a lesbofobia no ensino superior. Os dados foram produzidos por um levantamento bibliográfico sobre o tema, pela participação em grupos afins à questão e por entrevistas narrativas com mulheres universitárias que se identificam como lésbicas ou bissexuais. Os diálogos teóricos se deram com autoras do campo das lesbianidades numa perspectiva pós-estruturalista. Percebemos que na universidade os processos de reconhecimento das experiências lésbicas e da lesbofobia são precários, indicando ser preciso questionar sobre os limites de uma educação que se propõe democrática, participativa e não heteronormativa

Synergistic effect of fibres on the physical, mechanical, and microstructural properties of aerogel-based thermal insulating renders

There is an increasing demand for highly efficient thermal insulating materials in buildings. This study presents a novel solution incorporating nanomaterials, such as silica aerogel, which can achieve low thermal conductivity values (below 0.030 W m-1 K-1) in renders. A key challenge of using aerogels is their low mechanical strength and high capillary water absorption. Here we describe a novel approach employing fibres which mitigates against some key properties which are decreased as a consequence of using aerogel. The incorporation of aramid (0.50%), sisal (0.10%), and biomass (0.10%) fibres (by total volume) was evaluated experimentally in terms of physical, mechanical, and microstructural properties. A synergistic effect between the fibres and aerogel increased mechanical resistance and a reduction in the capillary water absorption, when compared to the reference render (without fibres), whilst maintaining the low thermal conductivity. However, these properties depended significantly on whether the fibres were synthetic or organic. This study is important as it demonstrates that aerogel-based fibre-enhanced thermal renders can contribute to higher energy efficiency in both new construction and retrofitting. The use of these materials will have a direct positive impact on addressing the climate crisis

Synergistic effect of fibres on the physical, mechanical, and microstructural properties of aerogel-based thermal insulating renders

There is an increasing demand for highly efficient thermal insulating materials in buildings. This study presents a novel solution incorporating nanomaterials, such as silica aerogel, which can achieve low thermal conductivity values (below 0.030 W m-1 K-1) in renders. A key challenge of using aerogels is their low mechanical strength and high capillary water absorption. Here we describe a novel approach employing fibres which mitigates against some key properties which are decreased as a consequence of using aerogel. The incorporation of aramid (0.50%), sisal (0.10%), and biomass (0.10%) fibres (by total volume) was evaluated experimentally in terms of physical, mechanical, and microstructural properties. A synergistic effect between the fibres and aerogel increased mechanical resistance and a reduction in the capillary water absorption, when compared to the reference render (without fibres), whilst maintaining the low thermal conductivity. However, these properties depended significantly on whether the fibres were synthetic or organic. This study is important as it demonstrates that aerogel-based fibre-enhanced thermal renders can contribute to higher energy efficiency in both new construction and retrofitting. The use of these materials will have a direct positive impact on addressing the climate crisis

Durability of a New Thermal Aerogel-Based Rendering System under Distinct Accelerated Aging Conditions

The widespread application of innovative thermal enhanced facade solutions requires an adequate durability evaluation. The present work intends to assess the durability of a new aerogel cement-based rendering system through the adaptation of different accelerated aging cycles, such as heating-freezing, freeze-thawing, and heat-cold. Several mechanical properties and also capillary and liquid water absorptions were tested for uncoated and coated specimens. A decrease in the mechanical strength, especially after freeze-thaw cycles, was observed. However, the water action promoted the late hydration of the cement paste contributing to the densification of the matrix and, consequently, the increase of the adhesive strength. Additionally, a decrease in the dynamic modulus of elasticity and an increase in the Poisson's ratio were observed after aging, which indicates a higher capacity of the render to adapt to substrate movements, contributing to a reduction of cracking

Suscetibilidade in vitro de dermatófitos a azóis pelos métodos macro e microdiluição em caldo

The in vitro susceptibility of dermatophytes to the azole antifungals itraconazole, fluconazole and ketoconazole was evaluated by broth macro and microdilution methods, according to recommendations of the CLSI, with some adaptations. Twenty nail and skin clinical isolates, four of Trichophyton mentagrophytes and 16 of T. rubrum were selected for the tests. Itraconazole minimal inhibitory concentrations (MIC) varied from < 0.03 to 0.25 µg/mL in the macrodilution and from < 0.03 to 0.5 µg/mL in the microdilution methods; for fluconazole, MICs were in the ranges of 0.5 to 64 µg/mL and 0.125 to 16 µg/mL by the macro and microdilution methods, respectively, and from < 0.03 to 0.5 µg/mL by both methods for ketoconazole. Levels of agreement between the two methods (± one dilution) were 70% for itraconazole, 45% for fluconazole and 85% for ketoconazole. It is concluded that the strains selected were inhibited by relatively low concentrations of the antifungals tested and that the two methodologies are in good agreement especially for itraconazole and ketoconazole.Foi avaliada a suscetibilidade in vitro de dermatófitos aos antifúngicos itraconazol, fluconazol e cetoconazol, pelos métodos macro e microdiluição em caldo, de acordo com as recomendações do CLSI, com algumas modificações. Foram estudados 20 isolados clínicos de lesões de unha e pele, sendo quatro Trichophyton mentagrophytes e 16 T. rubrum. A concentração inibitória mínima (CIM) para itraconazol variou de < 0,03 a 0,25 µg/mL pelo método da macrodiluição, e de < 0,03 a 0,5 µg/mL pela microdiluição em caldo; de 0,5 a 64 µg/mL e de 0,125 a 16 µg/mL para fluconazol, respectivamente, pela macro e microdiluição; e de < 0,03 a 0,5 µg/mL por ambos os métodos para cetoconazol. A concordância entre os dois métodos (considerando ± uma diluição) foi de 70% para itraconazol, 45% para fluconazol e 85% para cetoconazol. Conclui-se que os isolados estudados foram inibidos por concentrações relativamente baixas dos antifúngicos testados, e os dois métodos apresentam boa concordância, especialmente para itraconazol e cetoconazol

EXTRACELLULAR MIMETICS: A COMPARATIVE EVALUATION OF CELL ENCAPSULATION UTILIZING HYDROGELS AND SCAFFOLDS

An in vitro encapsulation platform utilizing hydrogels and bone matrix (BM) scaffolds to investigate the effects of microenvironmental parameters on encapsulated goat mesenchymal stem cells (gMSC) was presented. The base encapsulation matrix was composed of a biocompatible hydrogel formed through a photoinitiated polymerization process. Different polymer concentrations were used to compare the effects of hydrogel crosslinking density on physical properties, as well as on cell viability. The potential of BM to support the growth and differentiation of gMSC was also analyzed. Both methods were compared in order to analyze viability. Structures that better allow flow of oxygen showed more promising results, whereas BM structures require a better evaluation method for concrete results

In-Situ Tests on Silica Aerogel-Based Rendering Walls

In this paper, two aerogel-based renders are characterized based on in-situ testing of walls prototypes. The in-situ tests to assess the mechanical performance are: pull-off, surface impact tests and compressive strength on collected samples. The physical performance includes the water resistance and thermal conductivity coefficient. The tests carried out to assess water-resistance are: Karsten tube, moisture meter and capillary water absorption of collected samples. The thermal performance was tested based on infrared thermography and thermal conductivity transient method. The combination of these in-situ tests allowed a better performance characterization of the aerogelbased renders and characterized the applied renders. These results were carried out under two national research projects (Nanorender and P2020 PEP)

Compósitos De Termoplásticos Reciclados Com Fibras De Bromeliáceas

A patente descreve um processo para obtenção de compósito de termoplástico pós-consumo com fibra natural da família de bromeliáceas obtido por extrusão seguido de injeção. A fibra natural lavada passou por tratamento superficial para melhorar as propriedades de adesão, a matriz polimérica de termoplástico reciclado também foi modificada com agente de acoplamento para a mesma finalidade. O compósito obtido, apresentou boas propriedades mecânicas sendo indicado para substituir compósitos com cargas minerais. O módulo de rigidez aumenta linearmente em função do aumento do teor de fibra. Ocorre uma diminuição exponencial do valor do índice de fluidez em função do aumento do teor de fibra comparado ao termoplástico pós-consumo. Este produto apresenta a vantagem de utilizar polímero pós-consumo, ser produzido por um processo contínuo, apresentar menor densidade comparado com produtos utilizando cargas minerais, ser biodegradável e não abrasivo aos equipamentos de processo. Ele apresenta potencial de aplicação na indústria automotiva, construção civil e outras.BR0201054C08J11/04C08J11/04BR20020201054C08J11/04C08J11/0