Avaliação da granulometria de calcário calcítico nas dietas de pintinhos da linhagem de corte

O presente trabalho teve como objetivo avaliar a mineralizaçao óssea de pintinhos da linhagem de corte submetidos a três tipos de tratamento (1, 2, 3 ), compostos por diferentes granulometrias de calcário calcítico, totalizando três tipos de ração com seis repetições cada. As rações que compõem os diferentes tratamentos foram formuladas a base de milho e farelo de soja, sendo adicionado calcário calcítico em suas diferentes granulometrias.Este trabalho foi realizado na Granja Experimental de Frangos de Corte, situada na Fazenda do Glória, em Uberlândia - MG, no período de abril a maio de 2005. Foram utilizadas 720 aves, mistas da linhagem Avian 48, sendo distribuídas 30 aves por boxe (total de 24 boxes). Assim nas condições em que o experimento foi conduzido pode-se concluir que o aumento da granulometria do calcário calcítico adicionado às rações aos 7 dias de idade influenciou nas variáveis teor de cálcio e teor de fósforo nos ossos

Evaluation of zinc removal and compressive strength of self-reducing pellets composed of Electric Arc Furnace Dust

The amount of Electric Arc Furnace Dust (EAFD) is continuously increasing in mini-mill steel plants. This dust is considered a hazardous waste because of the presence of elements like lead, cadmium and chromium. Among many different treatment processes for this issue, there is the possibility of returning the EAFD back to the Electric Arc Furnace. This article presents a study of the compressive strength of selfreducing cold bonded pellets as well as their zinc removal, in an agglomerate containing EAFD, petroleum coke (PET) and Portland cement. The effects of the reductant and binder employed were discussed. Moreover, an apparatus was built to prevent zinc gas reoxidation inside an electric vertical laboratory furnace. Thus, the fraction of weight loss complemented the result of a previous study indicating the optimal content of PET source usage between 10 to 15%, in mass. Zinc removal and additional X Ray Diffraction outcomes are shown and discussed, concluding that 80% of zinc removal for this system could indicate the possibility of the EAFD reuse

Analysis and verification of process variables as causes for macroinclusions and scrapping in a special steel melt shop

The technology used in manufacturing steel for mechanical constructions has made great progress in recent years, resulting in a remarkable reduction of the impurities in special steel. One of these impurities is known as macroinclusion, the presence of which can cause serious defects in the steel structure. In a melt shop, where the semi-finished product is formed, there are several variables that can cause the formation of impurities in the steel and must be controlled. Therefore, by analyzing the influence of the primary melt shop variables, including: the iron and manganese oxides of the ladle slag (FeO+MnO), the stopper rod level variation and the argon pressure in the shroud between ladle and tundish in continuous casting; it was possible to establish a relationship between scrap generation and these process variables, through the creation of an investigation method. As result it was possible to identify the scrapping relationship with the presence of high FeO and MnO contents in the slag, during ladle furnace starting operations, along with stopper rod level variation in the tundish

Self-reducing pellets composed of wastes from steelmaking production for their recycling

This paper presents a study about the recycling of a mixture of EAF filter dust and mill scale; and slag, in the form of self-reducing pellets. At first, chemical and morphological characteristics of the material were investigated. Pelletizing was carried out manually, with the use of graphite 100% fixed carbon and molasses as binder with moisture. The results of reduction tests under the temperature of 1200 ºC for the wastes could be analyzed according to the use of different contents of reducing agent, time and mass loss. It was found that 20% of the carbonaceous material was the best configuration for a maximum mass loss, for both wastes. Furthermore, the pellets composed of stainless steel slag, added to the metallic bath presented a chromium recovery of around 95%, indicating its potential reuse

Avaliando a relação entre garra e desempenho acadêmico em estudantes: Uma revisão sistemática

The aim of the present study was to analyze, through a systematic review with students, how grit is associated with different ways of measuring academic performance. For this purpose, a search was carried out in the Scielo, PsycNET and PubMED databases with the descriptors “academic performance”, “grit” and their variations. 1470 articles were identified, 24.6% (363) from Scielo, 24.1% (355) from PsycNET and 51.1% (752) from PubMED. After excluding duplicates and applying the eligibility criteria, 25 articles were selected for full reading. Research was identified between the years 2016 (8%) and 2021 (20%), most of which were from 2020 (36%), published in English (96%), with higher education students (48%), which They used the Short Grit Scale (67%) to measure grit and GPA (average performance; 48%) to evaluate academic performance. When analyzing the articles, they were divided into four categories: positive correlation between grit and academic performance (52%), measurement instruments (40%), low relationship between grit and academic performance (4%) and did not identify a statistically significant correlation with or GPA (4%). The findings allowed us to build a general overview of the way in which the issues of grit and academic performance are being studied, considering the national and international panorama. It is likely that the absence of national research reports a gap in the research carried out on the topics jointly in our context, suggesting future studies of both a theoretical and empirical nature.El objetivo del presente estudio fue analizar, a través de una revisión sistemática con estudiantes, cómo el grit se asocia con diferentes formas de medir el rendimiento académico. Para ello se realizó una búsqueda en las bases de datos Scielo, PsycNET y PubMED con los descriptores “academic performance”, “grit” y sus variaciones. Se identificaron 1.470 artículos, 24,6% (363) de Scielo, 24,1% (355) de PsycNET y 51,1% (752) de PubMED. Después de excluir duplicados y aplicar los criterios de elegibilidad, se seleccionaron 25 artículos para lectura completa. Se identificaron investigaciones entre los años 2016 (8%) y 2021 (20%), la mayoría de las cuales fueron del 2020 (36%), publicadas en inglés (96%), con estudiantes de educación superior (48%), que utilizaron el Short Grit Scale (67%) para medir el valor y GPA (rendimiento promedio; 48%) para evaluar el desempeño académico. Al analizar los artículos, se dividieron en cuatro categorías: correlación positiva entre grit y rendimiento académico (52%), instrumentos de medición (40%), baja relación entre grit y rendimiento académico (4%) y no identificaron una correlación estadísticamente significativa con o GPA (4%). Los hallazgos permitieron construir un panorama general de la forma en que los temas de grit y desempeño académico están siendo estudiados, considerando el panorama nacional e internacional. Es probable que la ausencia de investigaciones nacionales reporte un vacío en las investigaciones realizadas sobre los temas de manera conjunta en nuestro contexto, sugiriendo futuros estudios tanto de carácter teórico como empírico.O objetivo do presente estudo foi analisar, por meio de uma revisão sistemática com estudantes, como a garra está associada às diferentes formas de mensuração do desempenho acadêmico. Para tanto, foi realizada uma busca nas bases de dados do Scielo, PsycNET e PubMED com os descritores “desempenho acadêmico”, “garra” e suas variações. Foram identificados 1470 artigos, destes 24,6% (363) do Scielo, 24,1% (355) do PsycNET e 51,1% (752) no PubMED. Após exclusão de duplicados e aplicação dos critérios de elegibilidade, 25 artigos foram selecionados para leitura completa. Foram identificadas pesquisas entre os anos de 2016 (8%) e 2021 (20%), sendo a maioria do ano de 2020 (36%), divulgados em idioma inglês (96%), com estudantes do ensino superior (48%), que empregaram o Short Grit Scale (67%) para mensurar a garra e o GPA (média de rendimento; 48%) para avaliar o desempenho acadêmico. Ao analisar os artigos, estes foram divididos em quatro categorias: correlação positiva entre garra e desempenho acadêmico (52%), instrumentos de mensuração (40%), baixa relação entre garra e desempenho acadêmico (4%) e não identificaram correlação estatisticamente significativa com o GPA (4%). Os achados permitiram construir um panorama geral sobre a maneira como as temáticas de garra e desempenho acadêmico estão sendo estudadas, quando se considera o panorama nacional e internacional. É provável que a ausência de pesquisas nacionais reporte uma lacuna nas pesquisas realizadas sobre os temas conjuntamente em nosso contexto, sugerindo estudos futuros tanto de natureza teórica quanto empírica

Desenvolvimento de filamentos de PLA e óxido de grafeno para melhoria termomecânica de peças produzidos por impressão 3D / Development of PLA and graphene oxide filaments for thermo-mechanical improvement of parts produced by 3D printing

Filamentos de nanocompósitos de PLA com óxido de grafeno foram produzidos para aplicação em impressão 3D do tipo modelagem por fusão e deposição. As peças impressas com os nanocompósitos apresentaram melhores propriedades mecânicas se comparadas às peças impressas com PLA puro. As propriedades térmicas dos nanocompósitos não apresentaram alteração frente ao PLA. Foram avaliados também corpos de prova produzidos por injeção a fim de compará-los com aqueles obtidos por impressão 3D

Consumption of dry matter observed and predicted by the nutritional systems in senepol bulls kept in confinement

The objective was to compare the dry matter consumption (CMS) observed, through the use of the GrowSafe® electronic system, with that predicted by the BR-Corte (2010 and 2016) and NRC (2000) nutritional systems in confined Senepol bulls. To this end, 24 Senepol Bulls were used in a completely randomized design, uncastrated with an average initial weight of 368 kg and 16 months of age. The evaluation of the accuracy and approximation of the CMS estimates by the nutritional systems was adjusted by the simple linear regression model and the decomposition of the mean square of the prediction error (QMEP). The mean CMS observed was 10.33 kg.day-1, higher than the values predicted by the nutritional systems, in which the values predicted by the NRC (2000) and BR-Corte 2010 and 2016 underestimated the CMS by 29.62, 6.19 and 2.03%, respectively. The verification of QMEP and its decomposition made it possible to infer the proximity of the values predicted by the BR-Corte 2010 and 2016 models and the values observed, which presented a better adjustment in relation to the NRC. Surprisingly the values predicted by the NRC, created from a database with Bos taurus animals, showed greater distance from the values predicted and observed, and it was expected greater accuracy of the NRC models for this category and animal breed. It is concluded that the BR-Corte 2016 was the most appropriate model to estimate the CMS of confined Senepol bulls

Recent Trends in Pharmacological Activity of Alkaloids in Animal Colitis: Potential Use for Inflammatory Bowel Disease

Inflammatory bowel disease (IBD) is a chronic and disrupted inflammation of the gastrointestinal tract. IBD have two main conditions, Crohn’s disease and ulcerative colitis, and have been extensively investigated in recent years. Antibiotics derived from salicylates, steroids, immunosuppressors, and anti-TNF therapy are part of the therapeutic arsenal for IBD. However, very often patients stop responding to treatments over the time. In this context, searching for alternative agents is crucial for IBD clinical management. Natural products derived from medicinal plants are an interesting therapeutic alternative, since several studies have proven effective treatments in animal models of intestinal inflammation. Several naturally occurring compounds are potent antioxidants, both as free radical scavengers and as modulators of antioxidant enzymes expression and activity. A number of natural compounds have also been proved to inhibit the release of proinflammatory cytokines, decreasing the activation of nuclear factor κB (NF-κB), which is important to the inflammatory response in IBD. The alkaloids are substances of a very diverse class of plant secondary metabolites; an extensive list of biological activities has been attributed to alkaloids, such as being anticholinergic, antitumor, diuretic, antiviral, antihypertensive, antiulcer, analgesic, and anti-inflammatory. In the present work, studies on the pharmacological activity of alkaloids in experimental models of IBD were reviewed

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Orientadora: Prof. Dr. Rafaela Mantovani FontanaMonografia (graduação) - Universidade Federal do Paraná, Setor de Educação Profissional e Tecnológica, Curso de Graduação em Tecnologia em Análise e Desenvolvimento de Sistema