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Search Results: 1 - 10 of 241033 matches for " José Luiz Pereira de Rezende "
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José Luiz Pereira de Rezende,Ant?nio Donizette de Oliveira,Luiz Moreira Coelho Júnior
CERNE , 2005,
Abstract: The paper studied and discussed The Faustmann Method (Land Expected Value - LEV) comparing it with The NetDiscounted Value project evaluation criterion, in an infinite horizon (NDV ). The method was applied for determining land value,envisaging eucalyptus plantation in savannah area (cerrado) in Brazil, for the purpose of charcoal production. For the same situationthe Net Discounted Value was applied and compared. The costs considered were establishment, maintenance and harvesting and thatthe forest was managed with the substitution being done after cutting the original establishment at seven years of age, that is, there isno coppicing transport. The substitution cost was considered equal to that of establishment. The only income considered was the saleof the wood produced for energy (250 st/ha) at the price of US$ 7.10/st in the cutting age. The main conclusions were: For anydiscount rate, LEV is always a larger value than NDV , because NDV considers land in the relationship of costs; the assumption thatland only has value for wood production, implied by Faustmann methodology, doesn t have theoretical nor practical support; if thereis no alternative for land use, then its opportunity cost is zero and there would be no reason to determine its value; land productivevalue is not the only value that enters in the formation of its price. The Faustmann methodology doesn t capture the other factors thataffect land price, for instance, the speculative effects, cultural values, land protective value, protection against inflation and of statusattribution, etc..; LEV indicates how much can be spent in any cost item left out of the calculations.
Análise longitudinal dos pre?os do carv?o vegetal, no Estado de Minas Gerais
Coelho Junior, Luiz Moreira;Rezende, José Luiz Pereira de;Calegario, Natalino;Silva, Márcio Lopes da;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000300013
Abstract: wood charcoal is a renewable energetic resource responsible for the development of the forest key industries in brazil. the state of minas gerais is the largest producer and consumer of charcoal. this study analyzed the longitudinal series of charcoal prices, in the state of minas gerais. average m3 of charcoal prices published by abracave was used. for analyzing the series, it was used the sarima model, in order to find the parameters and to supply better forecasts for charcoal prices. the period from january 1975 to december 2002 was considered to adjust the model and the period from january to december of 2003 for validating the projections of the model. the choice of the most appropriate model was based on graphical analyses, stochastic tests and criteria for evaluation of the model order. among the studied models, sarima (2,0,1,) (0,1,1)12 provided better adjustment and in a economical way. in spite of the appearance of a random factor that distorted the real values of charcoal prices, the projections provided by the model were within the limits of the established significance.
álvaro Nogueira de Souza,Ant?nio Donizette de Oliveira,José Luiz Pereira de Rezende
Ciência Florestal , 2002,
Abstract: Os objetivos deste trabalho foram: a) propor e verificar a eficiência de um modelo matemático que permita estudar os efeitos do progresso tecnológico (redu o dos custos) sobre a época ótima de substituir povoamentos de Eucalyptus spp; b) determinar a rota o florestal de um povoamento de Eucalyptus spp; c) verificar qual seria o momento de substituir se as receitas estivessem constantes desde o início dos incentivos fiscais, ou seja, na década de 60, e, d) projetar o momento de substituir o povoamento no futuro, considerando os custos decrescentes e a produtividade constante a valores de hoje. Utilizou-se a Fun o Gompertz para o cálculo da produ o de madeira. O critério utilizado para a avalia o econ mica da viabilidade dos projetos foi o Valor Presente Líquido. O modelo proposto permitiu calcular o efeito do progresso tecnológico nos custos no período entre 1960 e 2000 e projetar os valores dos custos para o período entre 2000 e 2040. Concluiu-se que: a) a rota o, com valores atuais, encontra-se, em 7 anos, mantidas as receitas da década de 60; b) o momento ótimo de reforma estaria em seis cortes; c) o modelo mostrou-se eficiente para estimativas em um horizonte de até 40 anos; o estudo da cadeia de substitui o mostrou que as épocas ótimas de reforma caíram ao longo dos anos, de seis cortes na década de 60, três na década de 80 e dois atualmente; a tendência é permanecer nos dois cortes passando a três com um pequeno aumento na produtividade das talhadias.
José Luiz Pereira de Rezende,álvaro Nogueira de Souza,Ant?nio Donizete de Oliveira
CERNE , 2005,
Abstract: The importance of technological progress for the Brazilian forest enterprises cannot be denied. Its influencecomprehends all the activities, but can be summarized in the increase of income via yield increase or cost reduction and, mainly,in the two cases occurring together. Technological effects influence, among other aspects, the cutting age and the optimal time torenewal (a new plantinting or “reforma”) Eucalyptus plantations. Studies to determine these times are not so common in theliterature since it requires both forestry and economic knowledge. Before renewing an Eucalyptus stand, it is necessary totechnically and economically to define the optimal cut age the original planting and the coppicings and after how many cuttingsthe substitution of the plantations should be done. This study aimed at studying the optimal time to substitute Eucalyptus spp.Plantations, considering the gains earned through technological progress; to determine the cutting age of the population, theincome being increasing and the cost being decreasing; to propose and verify the efficiency of a mathematical model whichallows modeling the effects of technological progress; to study the substitution chain between 1960 and 2000 and between 2000and 2040, considering technological progress; and to test the results in a case study. The Gompertz Function was employed toobtain the volumes at the various ages. The criterion employed for the economic evaluation of the projects was the Presente NetValue (PNV). The proposed model allowed the calculation of yields and costs through time, study the effect of yield increaseand cost reduction and determine the rates of these increase and, or, reductions as well as determining rates which served asmoderators so that the yield and costs did not reach unreal values. It was concluded that: The rotation, with current values, is at 7years of age; the model proved to be efficient for estimates up to 40 years; with the income and costs from the sixties, consideringtechnological progress from that point on, the number of cuttings before the renewal is currently 2; the substitution chain showedthat the optimal substitution time went down with time, going from 18 cuttings in the sixties to 4 cuttings in the eighties,currently getting to 2 cuttings; a tendency to stick with 2 cuttings before substitution was verified for future cultivation, althoughlittle technological improvement in the coppice yield brings the optimal substitution Point to after the third cutting.
álvaro Nogueira de Souza1;,José Luiz Pereira de Rezende,Ant?nio Donizette de Oliveira
CERNE , 2001,
Abstract: The few studies on renewal of Eucalyptus spp populations done in Brazil consider constant technology. This is done this way for facilitating the modeling of how variables affect this activity, such as income, costs, rates of discount and yield. The reason for not considering the gains earned through technological progress is the lack of a specific dynamic model. This study was carried out aiming to get to know the forest rotation with values from the sixties (beginning of tax exemption programme) and current values (nineties) aiming to obtain wood for cellulose and charcoal production; to determine the moment of substitution of a population which presents the same yield and the same cost structure through time as well as to determine how many cuttings should be done until the final cycle; to determine how many cuttings should be done until substitution (substitution chain); to verify the sensitivity of the substitution time to variations in the discount rates, wood prices, yield, land costs, harvesting costs and coppice yield. The results were tested in a case study, employing the Gompertz Function to determine the population yield. The Current Net Value Method was used as a crieterion of economic decision. It has been concluded that: The forest rotation to produce charcoal in the sixties was at 13 years of age; the current rotation is at 7 years of age; the final cycle allows up to 13 cuttings, but considering the possibility of land leasing, the best alternative is to conduce the sproutings up to the third cutting; an increase in factors such as discount rates, wood prices and yield caused reduction of the cutting age; increase in land costs did not affect the cutting ages; increase in the logging cost increased the cutting ages; the substitution of population now a days happens after 3 cuttings, while in the sixties it happened after 2 cuttings due to the lesser loss; an increase in factors such as discount rates, wood prices, logging costs and coppice yield increased the number of cuttings before the substitution and increase in the yield caused reduction of the substitution age (number of cuttings).
Adriano Garcia de Souza,Luís Ant?nio Borges,José Luiz Pereira de Rezende
Holos Environment , 2012,
Abstract: This work evaluated the current judicial control of the environmental administrative acts, considering the evolution of the legal doctrine after the Federal Constitution of 1988. The legal conception of the environmental administrative act has, gradually, being modified after the promulgation of the Federal Constitution of 1988. The insertion, in the constitutional text, of directional principles of the public administration, together with specific commandments of the environmental protection, forced the law scholars to modify the traditionalistic vision of the principle of the presumption of legality of the administrative act, when it is able to cause significant environmental damage to biodiversity. Such positioning of the legal doctrine has forced some courts to judge, more severely, the principles of the environmental administrative act, analyzing not only the formal aspects of its establishment, but also its motivation, reasonableness proportionality and purpose. However, the defense of the doctrines of the administrative law in the amplification of the judicial control of the environmental administrative act is not causing a sensible alteration in the jurisprudence that still reflects a positioning of the courts in the exclusive analysis of its formulation. The extended judicial control, although not yet a rule in the judicial analysis of the environmental administrative acts, demonstrates a way to be pursued in the preservation of the natural resources, amplifying and diversifying the existing control mechanisms. = Este trabalho visa avaliar o controle judicial atual dos atos administrativos ambientais, considerando a evolu o da doutrina jurídica pós Constitui o Federal de 1988, cuja concep o vem, paulatinamente, sendo alterada a partir de ent o. A inser o, no texto constitucional, de princípios norteadores da administra o pública, aliada aos mandamentos específicos da tutela ambiental, vem levando os estudiosos do direito a modificarem a vis o tradicionalista do princípio da presun o de legalidade do ato administrativo, quando este puder causar significativo dano ambiental à biodiversidade. Tal posicionamento da doutrina jurídica tem levado alguns tribunais a apreciarem, com maior rigor, os princípios norteadores do ato administrativo ambiental, analisando n o só seus aspectos formais, mas também sua motiva o, razoabilidade, proporcionalidade e finalidade. Entretanto, a defesa dos doutrinadores do direito administrativo na amplia o do controle judicial do ato administrativo ambiental, n o vem se traduzindo em uma sensível altera o na ju
José Luiz Pereira de Rezende,Ant?nio Donizette de Oliveira,Carla Rodrigues
CERNE , 2005,
Abstract: This work was designed to determine the influence of tributes on the optimum economical age of harvestingEucalyptus spp. stands, to determine the number of cuttings between the reform of Eucalyptus spp. stands, to determine and analyzethe contribution of tributes to the wood production costs. Many tributes are due on the forest sector. In this study, the tributesconsidered are the ones falling on the production of forest on products and services (TMS), income tax on businessoperation (ITJP), social raw material, not including, therefore, those which are due on industrialization. They are: forestrate (FR), cadastrum and registration rate (CRR), chainsaw record rate (MRR), chainsaw ownership tax (MPT), landownership tax (RTT), commercialization tax contribution on profit (SCP), contribution for financing of social security(CFSS), Contribution for the National Institute of Social Security (CNISS), contribution for the social integration program(CSIP), rural syndicate contribution (RSH). The criterion utilized to determine economic rotation and to determine theoptimum moment to renew the stand was the Net Present Value (NPV), considering an infinite planning horizon. The resultsobtained allowed to identify the ratio of the tributes in the total wood production cost.. It was found that the optimumharvesting time, not considering the tributes, occurred at 7 years o age; considering all the tributes, the optimum age occurredat 8 years. By not considering tributes would cause to unduly anticipate the optimum harvesting age. The optimum momentto make the renewal of the stand, not considering the tributes, occurred at 21 years, after the third cutting. However,taking into account the tributes, it would occur at 32 years (after the fourth cutting). By not considering the effect oftributation would cause one to unduly antecipate the optimum time to renew the stand. Tributation stands for 37.78% ofwood production cost, i.e., taxes contribute with 3.8%, imposts with 25.32% and contributions with 8.99%.
Brazilian sawn wood price and income elasticity
Rommel Noce,José Luiz Pereira de Rezende,Agostinho Lopes de Souza,Lourival Marin Mendes
CERNE , 2010,
Abstract: This study estimated the sawn wood demand price and income elasticity. Specifically it was estimated the priceelasticity of sawn wood, the cross price elasticity of wood panels and the income elasticity of Brazilian GDP. A log-log model withcorrection through outline of the mobile average (MA(1)) was used, adjusted for the period of 1971 to 2006, which showed to bestable, with satisfactory significance levels. It was observed that sawn wood demand is inelastic in relation to price and elastic inrelation to income.
Sele??o de progênies S0:1 de milho em diferentes densidades de semeadura
Steola, André Gustavo;Von Pinho, Renzo Garcia;Pereira, José Luiz de Andrade Rezende;
Bragantia , 2006, DOI: 10.1590/S0006-87052006000100010
Abstract: the present work aimed to evaluate the effect of planting density on the selection of inbred progenies. gnz 2004 single hybrid, its f2 generation and ninety-eight s0:1 progenies were evaluated in two plant densities, 50 thousand and 75 thousand plants ha-1in a simple 10x10 lattice design. the experiment was performed in the experimental area of the agriculture department of the universidade federal de lavras, in lavras, minas gerais state, brazil. yield of husked ear and prolificy were evaluated. results showed genetic variation among the s0:1 progenies in the two densities, allowing the selection of progenies with higher potential for production of husked ear corn. interaction of the progenies x densities was not significant that, associated with high genetic correlations, indicate that the selection could be performed efficiently at any density.
Micronutrients accumulation at different maize development stages
Borges, Iran Dias;Von Pinho, Renzo Garcia;Pereira, José Luiz de Andrade Rezende;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000400011
Abstract: the study of micronutrients accumulation as a function of plant development stage is of fundamental importance to subsidize strategies for fertilizer application and minimum amount to maintain soil fertility. this study evaluated micronutrient accumulation in two maize cultivars at different development stages. the experimental design was randomized blocks with four replications in split-plots, with two maize hybrids as the plots and sampling time according to development stages as sub-plots. maize accumulated minimum amounts of b, cu, mn, and zn in the initial stages of development, and the maximum accumulated values were observed after 100 days seedling emergency. the evaluated hybrids accumulated maximum of zn and cu close to physiological maturity. maize plants accumulate nutrients in the above ground parts as follows: zn > mn > cu > b. the total amount of nutrients required to produce one ton of corn is: 0.0009 kg b; 0.019 to 0.02 kg cu; 0.042 to 0.046 kg mn; 0.100 to 0.194 kg zn.
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