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Search Results: 1 - 10 of 453201 matches for " Márcio Lopes da;Fontes "
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Discuss?o sobre os critérios de avalia??o econ?mica: valor presente líquido (VPL), valor anual equivalente (VAE) e valor esperado da terra
Silva, Márcio Lopes da;Fontes, Alessandro Albino;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000600012
Abstract: frequently, it has occurred doubts and confusion in the interpretation of criteria of economic evaluation in the forestry sector. the objective of this was to clarify and argue the main issues related to the net present value, equivalent annual value and soil expected value, as well as to compare them and demonstrate that there is a relation among them. therefore, a study of case of a project of investment in eucalyptus reforestation was used in order to compare the criteria. the results indicated that all the criteria were adjusted and could be applied, being enough to know well the difference among them and the correct form of their interpretation.
Análise da atividade florestal no município de Vi?osa-MG
Fontes, Alessandro Albino;Silva, Márcio Lopes da;Valverde, Sebasti?o Renato;Souza, Agostinho Lopes de;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000400012
Abstract: forest activity was studied in vi?osa-mg, through a questionnaire applied to farmers who planted forests. a total of 63 farms were sampled, comprising an area of 2,096.95 ha. the natural and planted forest areas sampled were of 372.00 ha and 260.17 ha, corresponding to 17.74% and 12.41%, respectively. the predominant natural forest was the secondary forest (capoeira) (67.55%), and the species chosen for reforestation was eucalypt (92.68%). average labor use in the phases of implementation, maintenance and harvest of the forest plantations was estimated at 30.21, 13.64 and 61.25 days-man/hectare, respectively, totalling 105.10 days-man/hectare, with family labor participation of 25.24%. forest activity costs (r$/ha) were estimated at r$419.30 for implementation; r$146.49 and r$80.34 for first and second year maintenance, respectively, and r$2.11/m3 for wood harvesting cost. the forest plantations are concentrated at the hillside areas and the average number of jobs generated by reforestation (eucalypt) was 0.042 jobs/hectare. it was concluded that, overall, reforestation was considered a rather unattractive activity, with typical forest properties remaining unidentified. thus, it is recommended the elaboration of public policies to encourage reforestation.
Análise da atividade florestal no município de Vi osa-MG
Fontes Alessandro Albino,Silva Márcio Lopes da,Valverde Sebasti?o Renato,Souza Agostinho Lopes de
Revista árvore , 2003,
Abstract: Estudou-se a atividade florestal no município de Vi osa-MG, a partir de questionário aplicado aos agricultores cujas propriedades rurais possuíam florestas plantadas. Foi amostrado um total de 63 propriedades rurais, abrangendo uma área de 2.096,95 ha. As áreas de floresta nativa e plantada, na amostra, foram de 372,00 e 260,17 ha, o que corresponde, respectivamente, a 17,74 e 12,41% da área amostrada. O tipo de floresta nativa predominante foi a capoeira (67,55%), e a espécie preferida para o reflorestamento foi o eucalipto (92,68%). O uso médio da m o-de-obra nas fases de implanta o, manuten o e colheita dos plantios florestais foi estimado em 30,21, 13,64 e 61,25 dias-homem/ha, respectivamente, totalizando 105,10 dias-homem/ha, sendo a participa o da m o-de-obra familiar de 25,24%. Os custos inerentes à atividade florestal foram estimados em R$419,30/ha para implanta o; R$146,49/ha e R$80,34/ha para manuten o no primeiro e segundo ano, respectivamente; e R$2,11/m3 para colheita da madeira. Os plantios florestais concentram-se nas áreas de encostas, e o número médio de empregos gerados pelo reflorestamento (eucalipto) foi 0,042 emprego/ha. Concluiu-se, de modo geral, que o reflorestamento é considerado atividade pouco atrativa, n o identificando propriedades tipicamente florestais, sendo recomendada a elabora o de políticas públicas de incentivo ao reflorestamento.
Integra??o espacial no mercado mineiro de carv?o vegetal
Fontes, Alessandro Albino;Silva, Márcio Lopes da;Lima, Jo?o Eustáquio de;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000600013
Abstract: this study examined the spatial price integration among four regional markets of wood charcoal in minas gerais, brasil. after performing unit root tests, granger causality tests and estimating a var, it was concluded that the markets are integrated, in other words, a supply or a demand shock in one of those markets affects the prices of the wood charcoal in other markets. although the price of the wood charcoal has been analyzed in only four areas of the state, this study suggests that the wood charcoal market in minas gerais is working efficiently.
Aplica??o da programa??o dinamica na substitui??o de equipamentos
Marques, Gláucio Marcelino;Silva, Márcio Lopes da;Leite, Hélio Garcia;Fontes, Alessandro Albino;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000500010
Abstract: the objective of this work was to develop a dynamic programming model to determine the optimal time to replace equipment, including the incomes generated by the use and removal of the machine, aiming at the maximization of profits through a recurrence relation related to the incomes and costs along the years. thus, the proposed model was compared to the traditional replacement model using the dynamic programming that does not include the income generated by the equipment, used by filgueiras (1997). the model proposed was satisfactory according to the objective of the work, as its development made it possible to offer optimal decisions to replace or maintain the equipment. the model that includes only the costs showed to be best recommended in situations where the equipment is used without concern of generating annual incomes. on the other hand, the model developed can be used in situations where the equipment generates direct incomes or not. the model developed with the income showed to be efficient, and a greater susceptibility to a raise in the purchase value of the equipment was observed, whereas the model without concern to income is more susceptible to variations of interest rates. the advantage in using the dynamic programming (pd) in this case is that this tool offers a much greater range of alternatives at the moment of the decision making.
Prevalência da filariose canina causada por Dirofilaria immitis e Dipetalonema reconditum em Maceió, Alagoas, Brasil
Brito, Ana Cristina;Vila-Nova, Márcio Cavalcante;Rocha, Deisy Alécia Martins;Costa, Lidiana Gomes;Almeida, Wendell Alexandre Pinheiro de;Viana, Luciana da Silva;Lopes Jr., Ricardo Ramalho;Fontes, Gilberto;Rocha, Eliana Maria Maurício da;Regis,da;
Cadernos de Saúde Pública , 2001, DOI: 10.1590/S0102-311X2001000600034
Abstract: a survey on the prevalence of dirofilaria immitis and dipetalonema reconditum was conducted in 1,519 dogs from maceió and two coastal areas in the state of alagoas, northeast brazil, from 1995 to 1999, by testing for microfilariae in blood. all blood samples were from exclusively domiciled dogs with a known history, showing that the infections were autochthonous, confirming transmission of canine filariasis in these areas. in greater metropolitan maceió, 15 (1.3%) microfilaremic dogs were detected with d. immitis and 15 (1,3%) with d. reconditum. in the southern coastal area there was an estimated prevalence of 12.7% for d. immitis. d. immitis and d. reconditum microfilaria were 298.1μm and 249.2μm long and 7.3μm and 4.4μm wide, respectively. a witness immunotest that detects d. immitis antigen was used to confirm parasitological results and reveal occult dirofilariasis cases. of the total 6,579 females examined, 8 (0.1%) culex quinquefasciatus were observed to be naturally infected with d. immitis larvae. these results proved dirofilariasis transmission in maceió and demonstrated d. reconditum in the same geographic area.
Aplica??o da programa??o dinamica na substitui??o de povoamentos florestais
Silva, Márcio Lopes da;Silva, Rodrigo Firmino da;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000600011
Abstract: this work aims to develop and apply two models of dynamic programming to decide the best option of management of a forest stand along the planning horizon. the models aimed to maximize profit through a relation of recurrence concerning revenues and costs along the years and it was constructed based on a traditional model of replacement equipment. the results of both the models indicate that the best option for most situations is not to cut the young stands, followed by cutting and remodeling or cutting and lead to shooting for the older stands for all the training periods ( f1 through f7). the advantage of using dp, in this in case, is that this tool offers the planner a wider gamma of decision-making alternatives. it was concluded that for a company to maximize forest stand profits, without being concerned about planning horizon or regulated forest, it would have to opt for the traditionally known economic rotation. however, if the company wants to make decisions for a definite horizon planning and later sell the land and the forest, the alternatives are many. thus, the company can opt for cutting immediately or delaying the cut, perform the shootings or remodel. in this case, the dp model developed can present such alternatives and indicate the best options.
Estabelecimento de rota??o econ?mica para uma floresta regulada
Silva, Márcio Lopes da;Ribeiro, Carlos Antonio álvares Soares;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000100009
Abstract: the objective of this work was to determine the economic rotations for a forest stand taking into considereation only one harvest, infinite harvests and a regulated forest using mathematical models, as well as comparing them through the marginal analysis of optimality conditions. to validate the model and to verify the magnitude of the effect a study case of a forest project, with real values of production, costs, revenues and discounting rate, was used. the results indicated that the models were efficient to determine the economic rotation and that the rotation of the stand for one cut, infinite cuts and for the regulated forest were respectively 6.5, 5.5 and 5 years. the soil expectation value (sev) for the regulated forest was smaller than the sev of the stand due toimposed regulations on the forest management.
Estabelecimento de rota o econ mica para uma floresta regulada
Silva Márcio Lopes da,Ribeiro Carlos Antonio álvares Soares
Revista árvore , 2006,
Abstract: O objetivo deste trabalho foi determinar as rota es econ micas para um povoamento florestal, considerando-se um único corte e infinitos cortes, e para uma floresta regulada, por meio de modelos matemáticos, bem como compará-las através da análise marginal das condi es de otimalidade. Para validar o modelo e verificar a magnitude dos efeitos, foi utilizado um estudo de caso de um projeto florestal com valores reais de produ o, custos, receitas e taxa de desconto. Os resultados indicaram que os modelos foram eficientes para determinar a rota o econ mica e que a rota o do povoamento para um único corte e infinitos cortes e para a floresta regulada foi, respectivamente, de 6,5; 5,5; e 5 anos. O Valor Esperado do Solo (VES) para a floresta regulada foi inferior ao VES do povoamento, em virtude de se impor ao manejo a condi o de regula o.
Rentabilidade e risco de investimento na produ o de palmito de pupunha (Bactris gasipaes Kunth.)
Sidney Araujo Cordeiro,Márcio Lopes da Silva
CERNE , 2010,
Abstract: This study carried out an economic study and a risk simulation analysis in a palm heart of pejibaye (Bactris gasipaes Kunth.) cultivation project. Economic analysis was made by using the project evaluation methods: NPV, VAE, TIR and B/C; and the risk analysis was carried out through the Monte Carlo simulation technique by @RISK software. It was concluded that the project of palm heart of pejibaye cultivation is viable, with NPV of R$ 3.549,08; TIR of 19%; B/C greater than 1; the VAE of R$ 1.049,12. The risk analysis showed that the project presents a probability of 5% of getting a negative value for VPL. The variables which affected Net Present Value (NPV) according to the ranking of importance were: selling price, productivity and discount rate.
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