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Search Results: 1 - 10 of 189640 matches for " Souza Amaury Paulo de "
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Compacta??o de um latossolo vermelho causada pelo tráfego do "forwarder"
Fernandes, Haroldo Carlos;Souza, Amaury Paulo de;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000300002
Abstract: mechanization is a powerful tool in the agro-forest industry, today, playing an important role in the processes of forest production, exploration and transportation. however, this intensive machinery utilization can cause severe damages to the soil, especially compaction, which can have a negative reflection on productivity. the main objective of this research was to evaluate the effects of soil compaction caused by forwarder traffic. the soil physical parameters analyzed were: soil density and soil penetration resistance, with the soil samples being taken at five sampling points, equally spaced along the exploration track, at three depth levels (0-15 cm, 1530 cm and 30-50 cm). each variable was analyzed by variance analysis, applied in split plots with the following effects being evaluated: machine, depth, and machine-depth interaction. the result analysis showed that the forwarder caused a small soil compaction i.e., an average increase close to 0.06 g/cm3 in soil density and 1.00 mpa in soil penetration resistance. the maximum values of soil density and penetration resistance after machine traffic were, respectively, 1,12 g/cm3 and 2,87 mpa.
Compacta o de um latossolo vermelho causada pelo tráfego do "forwarder"
Fernandes Haroldo Carlos,Souza Amaury Paulo de
Revista árvore , 2003,
Abstract: A mecaniza o tem sido, atualmente, um poderoso instrumento para suprimento das necessidades da indústria agroflorestal, estando presente nos processos de produ o, colheita e transporte florestal. Esta utiliza o intensiva de máquinas pode, entretanto, acarretar danos ao solo, principalmente em termos de compacta o, podendo refletir negativamente na produtividade. Tendo em vista a escassez de informa es sobre a compacta o do solo causada pelas máquinas florestais, o objetivo principal deste trabalho foi a avalia o dos níveis de compacta o do solo causada pelo tráfego do trator florestal autocarregável (Forwarder). As variáveis físicas do solo analisadas foram a densidade e a resistência à penetra o, tendo as amostras de solo sido retiradas em cinco pontos igualmente espa ados ao longo das trilhas, em três níveis de profundidades (0-15 cm, 15-30 cm e 30-50 cm). A análise estatística dos resultados de cada variável foi efetuada por meio da análise de variancia para parcelas subdivididas, em que foram testados o efeito da máquina, o efeito da profundidade e o efeito da intera o entre a máquina e a profundidade. A análise dos resultados obtidos permitiu constatar que o Forwarder provocou uma pequena compacta o no solo, ou seja, incrementos de 0,06 g/cm3 na densidade e 1,00 MPa na resistência à penetra o do solo. Os valores máximos da densidade do solo e resistência à penetra o, depois da última passada da máquina, foram 1,12 g/cm3 e 2,87 Mpa, respectivamente.
Análise de danos de colheita de madeira em floresta tropical úmida sob regime de manejo florestal sustentado na Amaz nia ocidental
Pinto Alberto Carlos Martins,Souza Agostinho Lopes de,Souza Amaury Paulo de,Machado Carlos Cardoso
Revista árvore , 2002,
Abstract: Procurou-se identificar, qualificar e quantificar a intensidade de danos causados pela colheita florestal em uma área com floresta primária explorada (FPE), tendo com testemunha uma área com floresta primária n o-explorada (FPNE), com 202 e 204 ha, respectivamente. Na FPNE, foram avaliados os danos decorrentes de causas naturais. As áreas de FPE e de FPNE localizam-se no município de Manicoré, Estado do Amazonas. Realizou-se o inventário utilizando o método de amostragem aleatória, em ambas as áreas. As amostragens foram executadas em dois níveis de inclus o de DAP. No nível I foram instaladas cinco parcelas de 100 x 100 m (1 ha), onde foram inventariadas todas as árvores com DAP > ou = 15 cm. No nível II, as parcelas do nível I foram divididas sistematicamente em subparcelas de 10 x 10 m (100 m2), tendo sido amostradas aleatoriamente cinco subparcelas por parcela do nível I, totalizando 2.500 m2, onde foram inventariados todos os indivíduos (varej es) com 5,0 <= DAP < 15 cm. As análises dos danos decorrentes de causas naturais indicaram que na FPNE apenas 10% da vegeta o adulta remanescente apresentou danos. Na FPE, os danos causados pelas opera es de colheita florestal, incluindo-se o corte e o arraste de toras, totalizaram 29%. As modifica es na estrutura diamétrica da FPE foram maiores nas maiores classes de DAP, em que, em geral, foram constatadas redu es de 27, 29 e 30%, respectivamente, no número de árvores (n/ha), na área basal (m2/ha) e no volume (m3/ha). Essa redu o de estoque foi considerada normal, uma vez que a amostragem foi realizada imediatamente após a execu o das opera es de colheita florestal.
Avalia??o técnica e econ?mica da extra??o de madeira de eucalipto com"clambunk skidder"
Oliveira, Robson José de;Machado, Carlos Cardoso;Souza, Amaury Paulo de;Leite, Helio Garcia;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000200014
Abstract: the objective of this study was to evaluate technical and economic log extraction activities using a clambunk skidder with tracks over the tires. the technical evaluation consisted in determining the log extraction productivity indexes and the economic evaluation was based on operational cost determination. the experimental design was complete randomized, with a 3x2x5 factorial arrangement (three slope levels, two wood productivity classes and five ranks of extraction distance, with three repetitions). in a general way, the results showed that the equipment productivity decreases with the increase of the slope terrain and the extraction distance. its productivity varied from 18.34 m3.h-1 to 72.08 m3.h-1. the operational cost was us$ 90.93 per effective worked hour.
Avalia??o ergon?mica de cadeiras residenciais fabricadas no pólo moveleiro de Ubá, MG
Fialho, Patrícia Bhering;Souza, Amaury Paulo de;Minette, Luciano José;Silva, José de Castro;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000500013
Abstract: the objective of this work was to carry out ergonomic evaluation of residential chairs manufactured in the furniture industry of ubá, mg, seeking improvement of ergonomic quality of the pieces of furniture, as well as the increase in competitiveness of the products originated from of this pole. data was collected in 15 chairs from 12 industries associated with the trade union of uba's furniture industry- intersind. the criteria for ergonomic conformity were defined in agreement with the anthropometric principles of ergonomics and users safety aspects. the data obtained were compared with recommendations and anthropometrical data reported in the literature. the major problems detected in the chairs were related to seat dimensions and seat height from floor, in which 100% of the chairs presented seat heights higher than the recommended by the literature. the back portions showed no problems in relation to width, however the seat inclination angles must be adapted. another observed aspect was the great number of corners and sharp edges that can cause accidents to users.
Avalia??o ergon?mica de cadeiras de madeira e derivados
Souza, Amaury Paulo de;Fialho, Patrícia Bhering;Minette, Luciano José;Silva, José de Castro;
Revista árvore , 2010, DOI: 10.1590/S0100-67622010000100017
Abstract: this study aimed to carry out an ergonomic assessment of chairs and wooden products manufactured in the furniture cluster of carmo do cajuru, mg, and improve the ergonomic quality of furniture, involving aspects of anthropometric adaptation, comfort and safety. data were collected from chairs manufactured by industries associated with the union of furniture industries and wooden artifacts located in carmo do cajuru in the state of minas gerais - sindimov, mg. compliance criteria were defined according to the anthropometric principles, aspects of ergonomics and safety for the user. measurements were compared with anthropometric data and recommendations in the literature. the major problem identified in the chairs were related to seat dimensions. seat height of all chairs were above the literature recommendations. the back of the chairs showed no problems related width, however, adjustment of slope angles are required. another problem was the high incidence of pointy corners and sharp edges that can cause injuries to users.
Avalia??o de alguns fatores ergon?micos nos tratores "Feller-buncher" e "Skidder" utilizados na colheita de madeira
Lima, Juli?o Soares de Souza;Souza, Amaury Paulo de;Machado, Carlos Cardoso;Oliveira, Rone Batista de;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000200012
Abstract: this work was carried out in forest tractors used in a mechanized system for wood harvesting in a stand of eucalyptus, to evaluate quanti-qualitatively the dimensions of access, seat, commands, field view, thermal conditions and vibration in the operators' station. the access to the operator's station in the feller-buncher tractor presented a degree of difficulty classified in the qualitative evaluation as average and the skidder as good. the opening of the access doors presents an angle smaller than 90o, thus rendering the entrance and exit of the operator more difficult. the operators station of the feller-buncher tractor was classified as medium in the qualitative evaluation, due to the free space of the support platform being 30% of the total area, and in the skidder 55%, therefore being classified as good. the front field view in feller-buncher, even having a wider windscreen area, is limited by the presence of the headstock in by day as well as by night operations, therefore being smaller than the skidder's.
Classifica??o e custos de estradas em florestas plantadas na regi?o sudeste do Brasil
Lopes, Eduardo da Silva;Machado, Carlos Cardoso;Souza, Amaury Paulo de;
Revista árvore , 2002, DOI: 10.1590/S0100-67622002000300008
Abstract: the classification of forest roads is essential because it allows communication without terminology problems, providing subsidies to the planning, implementation, conservation and evaluation of the existing roads. the objective of this work was to elaborate a classification of forest roads and their respective construction costs and apply this classification to a brazilian forest company. through the combination of quality indexes, 20different classes of roads were obtained with their respective transport vehicle operational speed and 120 different types of roads were obtained with their respective construction costs. in the area where this work was conducted, three categories of road were observed: main, secondary and tertiary, with construction cost estimate of r$9050.00, r$4050.00 and r$2937.00/km, respectively.
Harvesting and wood transport planning with SNAP III program (Scheduling and Network Analysis Program) in a pine plantation in Southeast Brazil
Lopes, Eduardo da Silva;Machado, Carlos Cardoso;Souza, Amaury Paulo de;Ribeiro, Carlos Antonio Alvares Soares;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000600009
Abstract: the objective of this study was to verify the potential of snap iii (scheduling and network analysis program) as a support tool for harvesting and wood transport planning in brazil harvesting subsystem definition and establishment of a compatible route were assessed. initially, machine operational and production costs were determined in seven subsystems for the study area, and quality indexes, construction and maintenance costs of forest roads were obtained and used as snap iii program input data. the results showed, that three categories of forest road occurrence were observed in the study area: main, secondary and tertiary which, based on quality index, allowed a medium vehicle speed of about 41, 30 and 24 km/hours and a construction cost of about us$ 5,084.30, us$ 2,275.28 and us$ 1,650.00/km, respectively. the snap iii program used as a support tool for the planning, was found to have a high potential tool in the harvesting and wood transport planning. the program was capable of defining efficiently, the harvesting subsystem on technical and economical basis, the best wood transport route and the forest road to be used in each period of the horizon planning.
Volume de enxurrada e perda de solo em estradas florestais em condi??es de chuva natural
Garcia, Alessandra Reis;Machado, Carlos Cardoso;Silva, Elias;Souza, Amaury Paulo de;Pereira, Reginaldo Sérgio;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000400014
Abstract: the total runoff volume and soil loss caused by the production of sediments derived from forest road segments under normal rainfall conditions were determined. segment slopes from 1 and 7% were analyzed, with segment lengths ranging from 20 and 40 m and width of 4 m. the road segments were marked with 0.30 m wide boards, protected with a plastic, waterproof film. rainfall volume and intensity data were daily obtained by means of pluviometers and pluviographs. data collection period was one year, concentrated in the rainy season. runoff volume was most affected by segment length while soil loss was most affected by steepness. soil sediment mass increased exponentially in function of the increased runoff volume.
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