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Yam (Discorea sp) drying with different cuts and temperatures: experimental and simulated results
FIOREZE, Romeu;MORINI, Bruno;
Ciência e Tecnologia de Alimentos , 2000, DOI: 10.1590/S0101-20612000000200023
Abstract: the yam (discorea sp) is a tuber rich in carbohydrates, vitamins and mineral salts, besides several components that serve as raw material for medicines. it grows well in tropical and subtropical climates and develops well in zones with an annual pluvial precipitation of around 1300mm, and with cultural treatments, its productivity can exceed 30t/ha. when harvested, the tubers possess about 70% of moisture, and are merchandised "in natura", in the atmospheric temperature, which can cause its fast deterioration. the present work studied the drying of the yam in the form of slices of 1.0 and 2.5cm thickness, as well as in the form of fillets with 1.0 x 1.0 x 5.0cm, with the drying air varying from 40 to 70°c. the equating of the process was accomplished, allowing to simulate the drying as a function of the conditions of the drying air and of the initial and final moisture of the product. also investigated was the expense of energy as function of the air temperature. the drying in the form of fillets, with the air in a temperature range between 45 and 50°c, was shown to be the most viable process when combining both the quality of the product and the expense of energy.
Yam (Discorea sp) drying with different cuts and temperatures: experimental and simulated results
FIOREZE Romeu,MORINI Bruno
Ciência e Tecnologia de Alimentos , 2000,
Abstract: The yam (Discorea sp) is a tuber rich in carbohydrates, vitamins and mineral salts, besides several components that serve as raw material for medicines. It grows well in tropical and subtropical climates and develops well in zones with an annual pluvial precipitation of around 1300mm, and with cultural treatments, its productivity can exceed 30t/ha. When harvested, the tubers possess about 70% of moisture, and are merchandised "in natura", in the atmospheric temperature, which can cause its fast deterioration. The present work studied the drying of the yam in the form of slices of 1.0 and 2.5cm thickness, as well as in the form of fillets with 1.0 x 1.0 x 5.0cm, with the drying air varying from 40 to 70°C. The equating of the process was accomplished, allowing to simulate the drying as a function of the conditions of the drying air and of the initial and final moisture of the product. Also investigated was the expense of energy as function of the air temperature. The drying in the form of fillets, with the air in a temperature range between 45 and 50°C, was shown to be the most viable process when combining both the quality of the product and the expense of energy.
Fontes organicas de nutrientes em sistemas de produ??o de batata
Fioreze, Claudio;Ceretta, Carlos Alberto;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000600018
Abstract: in the last few years, the increase in economical cost and risk of potato crops has caused a decrease in number of potato farms in the quarta col?nia region, in the center of rio grande do sul state. the association of potato growers in the central region of rio grande do sul state (asbat) raised the demand to organic sources of nutrients to this crop as an alternative to chemical fertilizers. its objective is to decrease costs and environmental impact of potato crops, and is characterized by the need to identify organic sources of nutrients and to establish techniques for their use. to satisfy such demand, experimental plots were established to test rotation among commercial potato crops and cover crops, both at the main crop season and the inter-season, as well as comparisons among hen residue, hog residue and mineral fertilizers. results showed organic sources as an economical and technical alternative to chemical fertilizers. however, their efficiency was maximized when coupled with chemical fertilizers, mainly to maintain nitrogen supply along the crop cycle, especially in the case of hog residue use. hen residue is a better choice than hog residue because it has greater amount of nutrients.
Estimativas de vaz?es mínimas mediante dados pluviométricos na Bacia Hidrográfica do Ribeir?o Santa Bárbara, Goiás
Oliveira, Luiz F. C. de;Fioreze, Ana P.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011000100002
Abstract: in order to adjust a rain-flow model capable of estimating santa barbara river minimum flows, the authors analyzed the historical flow series and identified the base flow recession phase. the daily rainfall data observed at the stations fazenda alian?a, joviania, ponte sul goiana, maurilandia and ponte meia ponte were used to determine the total rainfall during the five months preceeding the dry season (p5). the average p5 for santa barbara river basin was obtained using the thiessen method. the rain-flow model produced in this work presented little errors compared with the minimum flows actually observed in the river during the dry season. the model allowed the authors to estimate the referrence flow q7,10. the method studied in this work made it possible to simulate the hidrogram corresponding to the base flow recession phase starting from p5 rainfall. this allows the public water manager in goias to prevent possible conflicts over water in the river basin using different rainfall distribution scenarios.
USES OF HYDRIC RESOURCES AT THE SANTA BáRBARA RIVER HYDROGRAPHICAL BASIN, GOIáS STATE, BRAZIL USOS DOS RECURSOS HíDRICOS DA BACIA HIDROGRáFICA DO RIBEIR O SANTA BáRBARA, GOIáS
Ana Paula Fioreze,Luiz Fernando Coutinho de Oliveira
Pesquisa Agropecuária Tropical , 2009, DOI: 10.5216/pat.v40i1.3869
Abstract: The minimization of conflicts concerning water use, as well as the security of using it in different ways, depends on appropriate hydric resources management, based on proper legal tools. The best legal tool for making water available for different uses and users, preventing or even solving conflicts, is the grant of rights to use it. For that reason, this research evaluates the uses of hydric resources at the Santa Bárbara River hydrographical basin, Goiás State, Brazil, comparing its water availability and current demand. It was possible to conclude that the instant maximum flow, collected in accordance with granted uses, surpasses the legal available flow and approaches the reference one. Another conclusion is that the previous accumulation of part of the total collected water volumes, made by most users, allows a collection process without conflicts or lack of water. KEY-WORDS: Hydric availability; reference flow; flow permanence curve. A redu o da ocorrência de conflitos envolvendo o uso de água, bem como a garantia de seus diversos tipos de uso, passam pela adequada gest o dos recursos hídricos, empregando-se instrumentos previstos em legisla o pertinente. O instrumento legal empregado para a distribui o de água, entre os diferentes usos e usuários, prevenindo ou mesmo solucionando conflitos, é a outorga de direito de uso. Em vista do exposto, este trabalho teve como objetivo a avalia o dos usos dos recursos hídricos, pela compara o entre a disponibilidade hídrica e a demanda instalada da bacia hidrográfica do Ribeir o Santa Bárbara, Goiás, o que permitiu concluir que a vaz o máxima instantanea captada pelos usos outorgados ultrapassa a alocável e se aproxima da vaz o de referência e que a a
Cultivares de soja sob plantio direto em Latossolo Vermelho compactado
Giarola, Neyde Fabíola Balarezo;Brachtvogel, Elizeu Luiz;Fontaniva, Silvano;Pereira, Regina Alves;Fioreze, Samuel Luiz;
Acta Scientiarum. Agronomy , 2009, DOI: 10.4025/actasciagron.v31i4.851
Abstract: the compaction process can promote changes in the physical attributes of soil, to the point of limiting the genetic potential for the development of more sensitive agricultural crops or cultivars. the goal of this study was to evaluate, on a clayed red latosol (oxisol), the response of production parameters of different varieties of soybean (glycine max) and physical attributes of soil under tillage farming, and with additional compression. the study was conducted at c-valley agroindustrial cooperative, in palotina (paraná state). two treatments of soil were evaluated: no-tillage without additional compaction (pd-c0) and no-tillage with additional compaction (pd-c1), and five varieties of soybeans: (1) coodetec 204, (2) coodetec 215, (3) monsoy 5942, (4) embrapa 48 and (5) spring. a completely randomized experimental design in a 5 x 2 factorial scheme was adopted. the attributes of soil evaluated were: bulk density, total porosity, macro- and microporosity. in the plants, the following parameters were assessed: harvesting dates, plant height, height of insertion of the first pod, mass of one thousand grains and productivity. the results showed that the parameters for the production of soybean cultivars were not influenced by the different levels of soil compaction, and the differences observed were due to the characteristics of the cultivars themselves.
Libera??o do N em solos de diferentes texturas com ou sem adubos organicos
Fioreze, Claudio;Ceretta, Carlos Alberto;Giacomini, Sandro José;Trentin, Gustavo;Lorensini, Felipe;
Ciência Rural , 2012, DOI: 10.1590/S0103-84782012005000045
Abstract: the n release in the soil with organic fertilization is affected by various factors, such as the amount and the caractheristics of the added manure, climatic conditions and soil type. this study aimed to evaluate the effect of soil texture and the n release from two sources of organic fertilizer. sandy loam soil (238mg clay kg-1), silt clay (470mg kg-1) and very-clay (605mg kg-1) were incubated, to which the poultry litter (47% n-nh4+) and the pig liquid slurry (14% n-nh4+) were added or not. the contents of n-nh4+ and n-no3- was determined at 0, 7, 14, 28, 56 and 112 days after incubation and calculated the net mineralization and the percentage of available n and net mineral nitrogen in relation to the total and added organic n, respectively. the higher clay caused more gradually nitrification, regardless of the type of organic fertilizer added, which may helps to reduce the polluting potential of n. the net n mineralization was also higher in sandy loam soil. this confirms the recommendation to spread the supply of nitrogen to crops, particularly in sandy soils and slurry rich in n-ammonia. the results indicated that the official indices of efficiency of n release (ieln), of 80% for the pig liquid slurry and 50% for the poultry litter, may be overestimated. therefore, it seems important to consider the n mineral of the soil in the calculation of the efficiency of the release to reduce the depletion of soil organic matter in a medium or long term. finally, the results point to the need for further studies so that the soil texture classes are considered as a variable to the recommended nitrogen through organic fertilizers.
Adi??o de ferro ao leite e sua reten??o na coalhada dessorada
Mangueira, Tiane Franco Barros;Travassos, Antonio Eustaquio Resende;Fioreze, Romeu;Medeiros, Rosália Severo de;
Ciência e Tecnologia de Alimentos , 2002, DOI: 10.1590/S0101-20612002000300018
Abstract: besides iron having a limited absorption by the body, few foods contain iron in considerable amounts. therefore, it is useful to consider the strategic enrichment of certain foods. adding iron by means of a clotting process may prove to be a plaausible procedure to increase the content of iron in cow's milk. iron in the form of fe(nh4)2(so4)2.6h2o (concentrations of 15, 20 and 25mg of fe/100ml) was added to cow's milk and the contents determined in both the curd and in the whey. it was observed that for the most part iron added to the milk was retained in the curd in a per-cent greater than 70% for the three levels tested and that as the amount of iron added increased, the per-cent retention also increased, with the exception of the highest concentration.
Compara??o de metodologias de preenchimento de falhas de séries históricas de precipita??o pluvial anual
Oliveira, Luiz F. C. de;Fioreze, Ana P.;Medeiros, Antonio M. M.;Silva, Mellissa A. S.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010001100008
Abstract: the absence of rainfall data for stations due to equipament or operator problems compromise information continuity. in order to apply a statistical treatment on rainfall historical series, gap filling needs to be done. usual methods for this are: regional means (pr), linear (rm) and potential (rp) multiple regression, regional means using linear regression (rs) and regional vector (vr). using total annual rainfall historical series with 22 years of observation for six rainfall stations in the state of goias, a comparison analysis was done between gap filling methods and the differences between observed and estimated values were evaluated. for the regional vector method five possibilities were considered extracting from the series the observed data, replacing the estimated value in the series by the methods of regional means (vr/pr), linear regression (vr/rm), potential regression (vr/rp) and regional means using linear regression (vr/rs). according to results it was concluded, in ascending order, minor the lowest differences in relative desviation were obtained with the methods: rm, vr/rp, pr, vr/rm, vr/rs, rp, rs, vr/pr and vr. according to the regional vector method, an improvement was verified in data values was verified when a combination between some other methods was used.
Avalia??o de híbridos de girassol e rela??o entre parametros produtivos e qualitativos
Pivetta, Laerte Gustavo;Guimar?es, Vandeir Francisco;Fioreze, Samuel Luiz;Pivetta, Laércio Augusto;Castoldi, Gustavo;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000300020
Abstract: the objective of this work was to determine superior genotypes of the sunflower, as well as to study the correlation between its characteristics. six sunflower hybrids were evaluated under late-summer conditions in palotina in the state of paraná. the study evaluated fifteen variables: leaf dry mass, stem and petiole dry mass, total dry mass, leaf area, plant height, stem diameter, grain weight per head, head diameter, percentage of normal grains, thousand grain weight, number of grains per head, productivity, crude protein content, oil content and oil yield. according to the data, the hybrids h360 and mg2, with good productivity and higher oil content, are indicated for oil production, and the hybrids m734 and aguará 3, with good productivity and lower oil content, for animal feed. the correlation between productivity and yield components were 0.62, 0.47, 0.60, 0.49 and 0.47, for grain weight per head, head diameter, percentage of normal grains, thousand grain weight and number of grains per head respectively, leading to the conclusion that the selection of materials from among these components will result in the selection of promising materials for productivity.
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