Programa de Pós-Graduação em Engenharia de Processos - PPGEP/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/10052

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Agora exibindo 1 - 2 de 2

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Avaliação da qualidade do Mapará (Hypophthalmus spp.) estocado entre camadas de gelo provenientes dos mercados de pescados de Santarém – PA
(Universidade Federal do Pará, 2021-08-09) CARDOSO, Renata Lima Sabá; CUNHA, Edinaldo José de Sousa; http://lattes.cnpq.br/8714515962963079
Maintaining the good quality of fish is essential for consumer health and for strengthening the fish production chain. One of the main ways to maintain this quality is through the use of ice for fish storage. Thus, this research aimed to identify, through sensory, microbiological and chemical analyzes (H2S, ammonia and pH tests) factors that offered variation in the shelf life of the Mapará (Hypophtalmus spp.) ice layer storage process. Two collections were carried out at the Mercado do Pescado fair in Santarém-PA: experiment 1, with 143 fish and experiment 2, with 81 fish. For the analyses, two fish were removed for sensory evaluation, two for pH evaluation, one fish for ammonia test, one for the H2S Eber test and one fish for microbiological analysis. The results obtained in the sensory analysis indicated that the fish rejection point occurred between the 17th and 20th day. In experiments 1 and 2, the pH values in fish meat were above 6.5, that is, outside the limit established by law. In the Éber test for H2S, there were positive results from the 11th day. The Éber test for ammonia showed a positive value from the 14th day on. In the microbiological analysis, NMP/g values of <1.8 to 79x104 (NMP/g) were found for thermotolerant coliforms and from 11 to >1,600 (NMP/g) for total coliforms. Ice storage for Hypophthalmus spp. proved ineffective for long periods. The result allows us to infer that monitoring, research and continuous awareness of good fishing practices and post-harvest fish management are necessary.
Acesso aberto (Open Access)
Modelos de estimativa de radiação solar global e análise Estatística em dez cidades do Estado do Pará – Brasil
(Universidade Federal do Pará, 2022-01-28) VALENTE, Alexandre Miguel da Cruz; ESTUMANO, Diego Cardoso; http://lattes.cnpq.br/5521162828533153
Estimating solar radiation is important for various segments of society such as agriculture, meteorology and electricity generation (photovoltaic systems). This workaims to estimate the Global Solar Radiation in ten cities in the state of Pará - Brazil, using estimation models, Hargreaves-Samani and Bristow-Campbell, using meteorological data provided by Automatic Meteorological Stations, belonging to the National Institute of Meteorology (INMET), to compare the observed and estimated values and analyze which model best fits the region, through the parameters Coefficient of Determination (R²), Willmott Index (d), Pearson correlation coefficient (r) andRelative Root Mean Squared Error (rRMSE). The results showed that the models are satisfactory and can be used to estimate the Global Solar Radiation, however for the less rainy period there was an overestimation, between june and november. The Castanhal station had the lowest average global solar radiation compared to the other stations with an average daily radiation equal to 15.06 M/m².day, while the city of Redenção had the highest daily average, 18.33 MJ /m².day. The city of Tomé Açu presented better fit of the models referring to the observed values, since for the HS model, the confidence index was considered very good, c equal to 0.78, and the relative RMSE was considered excellent, with rRMSE equal to 9.93%. For the B-C model for this station, the confidence index and the relative RMSE were considered good, c equal to 0.71 and rRMSE equal to 19.14%.

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