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Search Results: 1 - 10 of 97884 matches for " Ribeiro Carlos Antonio álvares Soares "
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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.
Aplica??o da geotecnologia no estudo de cadastro técnico rural e no mapeamento de áreas de preserva??o permanente e reservas legais
Gripp Junior, Joel;Soares, Vicente Paulo;Ribeiro, Carlos Antonio álvares Soares;Souza, Agostinho Lopes de;Gleriani, José Marinaldo;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000400004
Abstract: the main objective of this work was to map land use/land cover classes, permanent preservation areas and legal reserve areas in farms. the study area comprised part of the municipalities of cana?, araponga and ervália, in the state of minas gerais, brazil. a high resolution ortorectified image from the sensor ikonos ii with a 1-m spatial resolution was used for the study. the visual image interpretation generated 7 thematic map classes: forest cover, "clean" pasture and "overgrown" pasture, coffee plantation, build areas and areas of farming and reforestation. the permanent preservation areas were obtained from a hydrologically consistent digital elevation model. results showed a predominance of the classes coffee plantation (24.5%) and forest cover (28.8%), totalizing more the 50% of the study area. permanent preservation areas occupied 55.1%.
Sistema de otto-codifica??o modificado para endere?amento de redes hidrográficas
Silva, Natanael dos Santos;Ribeiro, Carlos Antonio Alvares Soares;Barroso, Wenderson Ribeiro;Ribeiro, Paula Euclides álvares;Soares, Vicente Paulo;Silva, Elias;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000500014
Abstract: this paper presents a new numbering system based on the pfafstetter codification scheme developed for stream networks. its main advantage is the use of the segments' length instead of the catchments' areas for establishing the pfafstetter code, therefore eliminating the need for elevation data. this methodology was then implemented in a software named otto-sys, developed for arc/info workstation in aml. in order to present the results of this new approach, a case study was carried out for the stream network of the caeté river, a tributary of iaco river, belonging to the amazon river basin. the details of such a digital hydrographic dataset led to 5 level-deep codes. each codification level is stored as a new column of the attribute table and the corresponding level dictates the number of digits of the code. once this codification scheme has been established, network-tracing tasks can be performed in any geographic information system using only attribute queries. this strategy speeds up such processes enabling them to be extended to real-time web-based devices.
Mapeamento dos fragmentos de vegeta??o florestal nativa da bacia hidrográfica do rio Alegre, Espírito Santo, a partir de imagens do satélite IKONOS II
Nascimento, Melchior Carlos do;Soares, Vicente Paulo;Ribeiro, Carlos Ant?nio álvares Soares;Silva, Elias;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000300009
Abstract: the main objective of this study was to create land use and diagnosis maps, at landscape level, of the native forest fragmentation through visual classification using ikonos ii data. the study was conducted in the river alegre watershed, situated in the south region of state of espirito santo, brazil. twelve land use classes were mapped, pointing out 475 forest fragments. the classes of coffee plantation (2,086.2 ha), pasture (14,130.1 ha) and forest fragmentation (2,978.9 ha) occupied 92.16% (19,195.2 ha) of the total study area, which was about 20,819.8 ha. the majority of the forest fragments presented strongly elongated shapes, with an average of 6.3 ha. it was also noticed that most of them presented a high level of disturbance, with 452 and 166 forest fragments neighboring the pasture and coffee plantation classes, respectively.
USO DO GEOPROCESSAMENTO NA IDENTIFICA O DE CONFLITO DE USO DA TERRA EM áREAS DE PRESERVA O PERMANENTE NA BACIA HIDROGRáFICA DO RIO ALEGRE, ESPíRITO SANTO
Melchior Carlos do Nascimento,Vicente Paulo Soares,Carlos Ant?nio álvares Soares Ribeiro,Elias Silva
Ciência Florestal , 2005,
Abstract: Este estudo teve como objetivos elaborar um mapa de uso da terra com base nas imagens do satélite IKONOS II, delimitar de maneira automática as áreas de preserva o permanente e identificar a ocorrência de conflito de uso, tendo como referência legal o Código florestal e a Resolu o n. 303, do CONAMA. A pesquisa foi desenvolvida na bacia hidrográfica do rio Alegre, situada no sul do estado do Espírito Santo. Utilizando os recursos disponíveis no geoprocessamento, foi possível mapear 12 classes de uso da terra e delimitar as áreas de preserva o permanente situadas no ter o superior dos morros (49,7 ha); encostas com declividade superior a 45 graus (27,5 ha); nascentes e suas respectivas áreas de contribui o (1.975,6 ha); margens dos cursos d′água com largura inferior a 10 metros (2.818,3 ha); e no ter o superior das sub-bacias (4.695,8 ha), perfazendo um total de 9.566,9 ha (45,95%) da área total da bacia. A área de uso indevido correspondeu a 7.499,7 ha (43,80%), sendo as classes cafezal (979,6 ha) e pastagem (6.179,8 ha) as principais ocorrências nessas áreas. Apenas 1.780,7 ha (18,61%) das áreas de preserva o permanente est o protegidas por vegeta o nativa.
Demanda de irriga??o suplementar para a cultura do milho no estado de Minas Gerais
Faria, Roberto Araújo de;Soares, Ant?nio Alves;Sediyama, Gilberto C.;Ribeiro, Carlos Ant?nio álvares Soares;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000100009
Abstract: using a soil water balance model and a geographical information system, the daily maximum demand of supplemental irrigation for corn in the state of minas gerais was simulated and spacialized, for coarse (total available water - taw: 0.6 mm cm-1), medium (taw = 1.2 mm cm-1) and fine (taw = 1.8 mm cm-1) soils. the daily dependable precipitations were estimated using the gamma distribution at 75% of probability and the daily evapotranspiration was computed using the penman-monteith (smith, 1991) with 50% probability. the best planting date considering the lower supplemental irrigation demand was spacialized.
Estrutura??o topológica de grandes bases de dados de bacias hidrográficas
Ribeiro, Carlos Antonio Alvares Soares;Soares, Vicente Paulo;Santos, Ronaldo Medeiros dos;Soares, Carlos Pedro Boechat;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000400010
Abstract: the present work aims to present and to evaluate a method for topologically structuring large databases, implemented as a set of aml routines for arcinfo workstation named hidrodata. the results proved that the processing time for delineating drainage areas and extracting their morphometric characteristics was kept low and constant. the use of a topologically structured database resulted in a lower demand of processing capacity. it was concluded that the presented approach can be applied for any watershed, independently of its size, even with the use of less-sophisticated computers.
Metaheurística Simulated Annealing para solu??o de problemas de planejamento florestal com restri??es de integridade
Rodrigues, Flávio Lopes;Leite, Helio Garcia;Santos, Heleno do Nascimentos;Souza, Agostinho Lopes de;Ribeiro, Carlos Ant?nio álvares Soares;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000200011
Abstract: the objectives of this work was to develop and test an algorithm based on simulated annealing (sa) metaheuristic to solve problems of forest management with integer constraints. the algorithm sa developed was tested in five problems containing between 93 and 423 decision variables, periodically subject to singularity constraints, minimum and maximum production.the problems had the objective of maximizing the net present value. sa was codified into delphi 5.0 language and the tests were performed in a microcomputer amd k6ii 500 mhz, with ram memory of 64 mb and hard disk of 15gb. the sa performance was evaluated according to the efficacy and efficiency measures. the different values or categories for the sa parameters were tested and compared in relation to their effects on the algorithm efficacy. the selection of the parameters' best configuration was performed by using the l&o test at 1% probability and analyses via descriptive statistics. the parameters' best configuration provided for sa average efficacy of 95.36%, minimum value equal to 83.66%, maximum value equal to 100%, with coefficient of variation of 3.18% of the mathematical optimum, obtained by the exact algorithm branch and bound. as for the larger problem, the efficiency of sa was ten times superior to the efficiency of the exact algorithm branch and bound. sa came out as a quite attractive new approach in forest management for solving important problems of difficult solution through the use of the current computational instruments.
Participa??o nos lucros definida pelos resultados
álvares, Antonio Carlos Teixeira;
Revista de Administra??o de Empresas , 1999, DOI: 10.1590/S0034-75901999000400008
Abstract: in december 1994, a federal constitution article was regulated determining employees' participation in the companies' profits or results (plr). thereafter, "plr" was incorporated to the union jargon and sometimes used to compose collective wage negotiations, including on a workers' category basis. this explicitly confronted the law, since not only participation is not supposed to supplement wages, but also profit and results are each and every company's unique features. the purpose of this article is to analyze the mistakes made by companies when using such an important instrument, with the sole objective of reducing payment of social taxes.
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