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Search Results: 1 - 10 of 15834 matches for " Oscar;FERNANDES "
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Arbitrage in General Equilibrium  [PDF]
Oscar Varela
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.34051
Abstract: Normal trade in goods assumes two sectors that co-exist for reasons such as comparative advantage and interact via trade. Arbitrage trade in goods assumes two markets that artificially exist and converge via trade. Restoration of the law of one price via arbitrage creates one sector out of two, and in general equilibrium, equalizes opportunity cost of resources used in production. Arbitrage does not occur in a vacuum, such that when the high (low) price of a good decreases (increases) in its artificially segmented market during arbitrage, the supply of the good falls (rises), the resources used intensively in that good earn lower (higher) returns, affecting security prices, and the supply of those resources in that good’s production fall (rise).
Planejamento agregado da produ??o ótimo com limite mínimo de estoque influenciado pelas incertezas de demanda
Silva Filho, Oscar S.;Carvalho, Marcius F. H.;Henrique, Moisés M.;Fernandes, Carlos A.;
Gest?o & Produ??o , 1995, DOI: 10.1590/S0104-530X1995000100001
Abstract: this paper deals with the determination of an optimal decision policy for a production planning problem with inventory and production constraints. the planning time horizon is finite, from 1 to 2 years approximately at monthly periods, which means that all data involved with the problem are totally aggregated and the fluctuating demand for each one period is stochastic, with probability distribution function assumed as gaussian. thus the problem studied here is a stochastic planning one with probabilistic constraint at the inventory level variable. it is shown that it is possible to obtain, by means of appropriate transformations, a deterministic equivalent formulation, for which an open-loop solution to stochastic problems can be generated, using any applicable mathematical programming algorithm. it is also shown that the uncertainties concerning demand fluctuation are explicitly presented in the deterministic formulation through a constraint function that represents the minimum inventory level limit or safety stock. this function is essentially concave and increases during time and depends on the variance of inventory level and probabilistic degree supply by the user to the inventory constraint. to illustrate the theoretical developments, a simple example of a single product system is proposed and solved by dynamic programming. the open- loop solution (i.e. approximate solution from an equivalent problem) is compared with the true solution obtained directly from the stochastic problem via stochastic dynamic programming.
Levantamento de perdas em hortali?as frescas na rede varejista de Mineiros
Tofanelli, Mauro BD;Fernandes, Marilaine de S;Carrijo, Núbia S;Martins Filho, Oscar B;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000100024
Abstract: in the present work a survey was carried out to determine the fresh vegetables losses at the retail market in mineiros county, goiás state, brazil, to supply information that may contribute to specific actions to improve the quality and availability of vegetables at the local market. the survey was carried out at retail outlets (eight supermarkets, two grocery stores and one street market) from december 2005 to january 2006. a questionnaire with questions about the weekly amount of losses in vegetables, the main cause of postharvest losses and the main internal and external strategies to reduce postharvest losses of fresh vegetables was applied in the retail shops. tomato, watermelon, carrot, potato, and cabbage had the highest losses. supermarkets, grocery stores and the street market showed discrepancy among loss percentages: 1.9, 4.2, and 21.5%; respectively. the main causes for losses were excess in the vegetable offer by retail market and environmental conditions. the stock control is the main strategy to be provided in order to decrease losses, and prices reduction by wholesale market was related to be the main external providence to be taken in order to decrease vegetable losses.
Mercado de hortali?as frescas no município de Mineiros-GO
Tofanelli, Mauro BD;Fernandes, Marilaine de S;Martins Filho, Oscar B;Carrijo, Núbia S;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000300030
Abstract: rational and efficient vegetable commercialization needs constant studies about markets to supply information which can support the elaboration of strategies and actions to improve all marketing context. the objective of this work was to carry out a survey about the fresh vegetable market in mineiros, goiás state, brazil, in order to supply market information that may assist specific actions for the sector. for this, a research was carried out in commercial establishments (supermarkets, grocery stores and street market) from december 2005 to january 2006 by applying questionnaires in each establishment. among the vegetables related in the research, tomato, watermelon, onion and potato were the ones commercialized weekly in higher volume. the results showed that supermarkets and grocery stores are the most responsible ones for the vegetable trade in mineiros. the local vegetable production deficiency was evidenced when it was established that 81.8% of the products commercialized in the city are coming from distant suppliers and only 18.2% from local producers. the agribusiness of vegetables in mineiros is incapable of supplying the city's necessities.
Perdas de frutas frescas no comércio varejista de Mineiros-GO: um estudo de caso
Tofanelli, Mauro Brasil Dias;Fernandes, Marilaine de Sá;Martins Filho, Oscar Barbosa;Carrijo, Núbia Sousa;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000300020
Abstract: the present work had as objective to carry through survey the losses of fresh fruits in the retail markets of the city of mineiros-go, as well as its causes and steps to be taken. for this research, visitation to the retail markets (supermarkets, groceries stores and street market) for an application of a questionnaire was realized. the results showed that 3.2% of the volume of fruits commercialized in mineiros are lost weekly and that the supermarkets, being the main retail markets, are predominant in the volume of losses. the retail markets had cited the inadequate storage (refrigeration lack) and the bad conditions of transport (highways under bad conditions of conservation) as the main causes of the losses of fresh fruits. supplying control, the education of the consumer, and fruit quality improvement are priority measures to be taken by the retail markets. it was concluded that the retail markets of mineiros need to develop more energetic actions and to be taken attitudes in order to control the losses of the fruit products.
Mercado de frutas frescas no município de Mineiros-GO
Tofanelli, Mauro Brasil Sias;Fernandes, Marilaine de Sá;Carrijo, Núbia Sousa;Martins Filho, Oscar Barbosa;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000200018
Abstract: the efficiency in the commercialization of fruits needs constant studies in the markets to supply information that can serve of support to the elaboration of strategies and executions of action for improvements of the marketing context. the present work had as objective to carry through survey of the market of fresh fruit in the city of mineiros (state of goiás, brazil) in order to supply market information that can assist in specific actions to the sector. for this, research in commercial establishments had been carried through. for this, retail equipment had been carried through research in commercial establishments (supermarkets, grocery stores/retail shops and street market) in december 2005 to january 2006 by means of application of questionnaires in each equipment. amongst the fruits related for the results of the research, the orange was the one that presented the biggest volume of commercialization (7,196 kg week-1), followed of the banana (2,812 kg week-1) and apple (2,526 kg week-1). the results had demonstrated that the supermarkets and grocery stores are main the responsible ones for the commerce of fruits in mineiros. the deficiency in the local production of fruits in mineiros could be suggested when he was established that 93.3% of the fruits commercialized in this city are supplied by the ceasas and only 6.7% for local producers.
Mauro Brasil Dias Tofanelli,Marilaine de Sá Fernandes,Núbia Sousa Carrijo,Oscar Barbosa Martins Filho
Pesquisa Agropecuária Tropical , 2008, DOI: 10.5216/pat.v38i3.4844
Abstract: O complexo sistema de comercializa o de hortifrutícolas requer estudos mercadológicos freqüentes, para a elabora o e implementa o de estratégias e a es de melhorias do sistema. O objetivo deste trabalho foi realizar um levantamento do mercado de frutas e hortali as, em Mineiros, GO, visando a fornecer informa es mercadológicas ao setor varejista destes produtos. Foram realizadas pesquisas em equipamentos varejistas como supermercados, quitandas e feiras-livres, entre dezembro de 2005 e janeiro de 2006, mediante aplica o de questionário. Dentre as frutas relacionadas pelos resultados da pesquisa, a laranja foi a que apresentou o maior volume semanal de comercializa o (7.196 kg), seguida da banana (2.812 kg), ma (2.526 kg) e abacaxi (1.935 kg). Entre as olerícolas, o tomate (7.854 kg), a melancia (6.600 kg), a cebola (4.882 kg) e a batata inglesa (4.272 kg) foram aquelas comercializadas em maior volume. Os supermercados e as quitandas s o os principais responsáveis pelo comércio de frutas e hortali as na regi o. O mercado destes produtos, no município, é dependente do fornecimento a longas distancias, sendo o agronegócio de hortifruticultura local incapaz de abastecer o município em suas necessidades. PALAVRA-CHAVE:Hortali as;comercializa o; mercado; fruticultura; olericultura. The complex fruit and vegetable commercialization system requires constant marketing studies for elaboration and implementation of strategies and actions to improve it. The objective of this study was to evaluate fruits and vegetables commercialization in the Mineiros municipality, Goiás State, Brazil, in order to provide information for retail trade. The survey was carried out in retail trade equipments, such as supermarkets, grocery stores, and street markets, from December 2005 to January 2006, by means of questionnaire application. Among the evaluated fruits, orange reached the higher weekly commer-cialization volume (7,196 kg), followed by banana (2,812 kg), apple (2,526 kg), and pineapple (1,935 kg). For vegetables, tomato (7,854 kg), watermelon (6,600 kg), onion (4,882 kg), and potato (4,272 kg) were the most commercialized items. Supermarkets and grocery stores are responsible for most of the fruit and vegetable commercialized in the region. The local horticulture agribusiness does not supply the regional demand, the marketing for those products depending on long distance suppliers. KEY-WORDS: Vegetables; commercialization; market; fruticulture; olericulture.
Eficiência agron mica de diferentes formula es de inoculantes contendo Bradyrhizobium na cultura da soja em Roraima. = The effectiveness of different formulations of inoculants containing Bradyrhizobium on the soybean crop in Roraima.
Jerri édson Zilli,Oscar José Smiderle,Paulo Ivan Fernandes Júnior
Agro@mbiente On-line , 2010,
Abstract: A tecnologia da inocula o tem permitido obter elevadas produtividades de soja sem a aplica o de nitrogênio mineral no Brasil. Para o maior sucesso desta tecnologia é importante avaliar a eficiência de diferentes formula es de inoculantes, principalmente em áreas de primeiro cultivo. Objetivou-se com este trabalho avaliar os efeitos da inocula o da soja com Bradyrhizobium nas formula es de veículo turfoso e líquido. Foram conduzidos dois experimentos em condi es de campo nos anos de 2005 e 2006 com inocula o de sementes da soja da cultivar BRS Tracajá na semeadura com inoculante turfoso, inoculante líquido, um controle sem inocula o, além de um tratamento com a aplica o de 200 kg ha-1 de N. Aos 35 dias apósa emergência das plantas foram avaliados o número e massa de nódulos, a massa seca e N-total da parte aérea, e, na colheitao rendimento de gr os e o acúmulo de N nos gr os. O inoculante turfoso proporcionou maior número e massa de nódulos, enquanto o fertilizante nitrogenado mineral propiciou maior massa seca e N-total da parte aérea e ambos foram superiores ao controle. A inocula o das sementes de soja com Bradyrhizobium proporcionou rendimento de gr os semelhante ao fertilizante nitrogenado com 200 kg ha-1 de N, independentemente do veículo do inoculante, evidenciando assim a eficiência da tecnologia de inocula o com ambas as formula es testadas. = The inoculation technology has resulted in obtaining high yields of soybean grains without the application of mineral nitrogen in Brazil. The evaluation of different inoculant formulations, especially in new areas, is important to improve the success of this technology. Consequently, the aim of this study was evaluate the effects of soybean inoculation with Bradyrhizobium in the peat and liquid carrier. Two field experiments were conducted in 2005 and 2006 using soybean (cultivar BRS Tracajá) seeds inoculated with peat or liquid inoculant, a control without inoculation, and another treatment with the application of 200 kg ha-1 of N. Thirty five days after the emergence of the plants the nodules number and dry weight, dry weight and Total N in aerial plant matter, and at the harvest, grains yield and N in the grains were evaluated. The peat inoculant provided high number of nodules and dry weight, while mineral nitrogen fertilizer provided the largest plant dry matter and total N; both of these treatments were significant superior relative to the control. The soybean seeds inoculation with Bradyrhizobium provided grains yield similar to mineral nitrogen fertilization with 200 kg ha-1 of N, indep
Liver histology in co-infection of hepatitis C virus (HCV) and Hepatitis G virus (HGV)
STRAUSS, Edna;GAYOTTO, Luiz Carlos da Costa;FAY, Fabian;FAY, Oscar;FERNANDES, Helena Sabino;CHAMONE, Dalton de Alencar Fischer;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2002, DOI: 10.1590/S0036-46652002000200003
Abstract: as little is known about liver histology in the co-infection of hepatitis c virus (hcv) and hepatitis g virus (hgv), hgv rna was investigated in 46 blood donors with hepatitis c, 22 of them with liver biopsy: co-infection hcv / hgv (n = 6) and hcv isolated infection (n = 16). besides staging and grading of inflammation at portal, peri-portal and lobular areas (brazilian consensus), the fibrosis progression index was also calculated. all patients had no symptoms or signs of liver disease and prevalence of hgv / hcv co-infection was 15.2%. most patients had mild liver disease and fibrosis progression index, calculated only in patients with known duration of infection, was 0.110 for co-infection and 0.130 for isolated hcv infection, characterizing these patients as "slow fibrosers". no statistical differences could be found between the groups, although a lesser degree of inflammation was always present in co-infection. in conclusion co-infection hcv / hgv does not induce a more aggressive liver disease, supporting the hypothesis that hgv is not pathogenic.
Alzira Gabriela Da Silva,Oscar Lopes De Farias Júnior,Aldi Fernandes De Souza Fran?,Eliane Sayuri Miyagi
Ciência Animal Brasileira , 2012,
Abstract: An experiment with pearl millet (Pennisetum glaucum) cv ADR-300 under nitrogen doses (0, 50, 100 and 150 kg.ha-1) at two residual height cuts (0.20 and 0.25 m) was carried out to evaluate dry matter production and chemical composition. The experiment was carried out at Universidade Federal de Goiás. The experimental design used was randomized blocks in a 4 x 3 factorial arrangement, with three replications. Dry matter production (DMP), dry matter content (DM), crude protein (CP), acid detergent fiber (ADF) and neutral detergent fiber (NDF) were evaluated. The DMP differed (P<0.05) among the N doses and cuts. DM content decreased as N doses increased. The addition of N doses promoted a rise of CP content at all the cuts. CP content decreased with the cuts succession. The NDF tenors differed (P<0.05) with the succession of the cuts at both heights. The ADF values (P<0.05) differed in function of the addition of N doses and the succession of the cuts. Pearl millet showed production and chemical composition variation in the performed treatments, thus, it is recommended for animal feeding that this forage plant is used at the residual height of 0.25 m and with application of a N dose of 150 kg.ha-1.
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