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Search Results: 1 - 10 of 22420 matches for " Ricardo Marius Della;Evangelista "
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Avalia??o da madeira de Eucalyptus camaldulensis Dehnh e Eucalyptus urophylla S.T. Blake em ensaios de usinagem, visando à produ??o moveleira
Souza, Maria Odete Alves de;Silva, José de Castro;Lucia, Ricardo Marius Della;Evangelista, Wescley Viana;
Revista árvore , 2009, DOI: 10.1590/S0100-67622009000400018
Abstract: the objective of this research was to conduct machining tests in woods of 6 and 8-year-old eucalyptus urophylla and of a ten-year old eucalyptus camaldulensis and to evaluate their possible use by the furniture industry. the wood samples were obtained from six trees of each clone, planted in a consortium with cattle and grain, owned by votorantim metals and zinc. the plantation is located in the neighborhood of the city of vazante, in the state of minas gerais. the following essays were conducted: cut by a table saw either parallel or perpendicular to the grain; shaping; planing; drilling; routing; mortising and drilling for dowels. all the samples yielded satisfactory results, mainly the eight year old eucalyptus urophylla, during parallel-to-the-grain and mortising sawing. woods from the clones tested seem very appropriate for furniture production. in fact, the samples did not show any difficulties during machining.
PHYSICAL AND MECHANICAL PROPERTIES OF THE WOOD OF Eucalyptus urophylla S.T. Blake IN THE BARK-TO-PITH DIRECTION AND ALONG THE STEM
Wescley Viana Evangelista,José de Castro Silva,Ricardo Marius Della Lucia,Lilian Messias Lobo
Revista Ciência da Madeira , 2010,
Abstract: The objective of this work was to evaluate some wood properties of a clone of Eucalyptus urophylla in the radial direction and in two positions along the trunk. The studied material came from Votorantim Metais Zinco S.A., and the plantations, located in Vazante, State of Minas Gerais, Brazil, were six years old. Six trees were harvested from which were cut two logs with three meter long each. Those logs were sawed into thick diametral slabs. A one-meter sample was obtained from these planks in the radial direction. Following this,samples were taken for the evaluation of specific gravity and apparent density, shrinkage from green or from 12% moisture, fiber and vessel sizes and static bending properties. It was foundthat basic and apparent specific gravities, total longitudinal shrinkage, fiber length, vessel diameter and moduli of rupture and elasticity tended to increase in the bark-to-pith direction,while partial longitudinal shrinkage, the tangential/radial ratios and the vessel frequency were reduced. Radial and tangential shrinkages, width, lumen diameter and fiber wall thickness showed different patterns of variation. Only partial volumetric, radial shrinkages and vessel frequency showed different values between the two logs taken from the same tree. The main correlations observed were between modulus of elasticity and of rupture with either specific gravity or apparent density and between fiber lumen diameter with specific gravity, total longitudinal shrinkage and with modulus of rupture in static bending.
Efeitos da purifica??o e do enriquecimento do creosoto vegetal na preserva??o da madeira de Eucalyptus grandis, após 48 meses de instala??o do ensaio de campo
Paes, Juarez Benigno;Vital, Benedito Rocha;Della Lucia, Ricardo Marius;Della Lucia, Terezinha Maria Castro;
Revista árvore , 2002, DOI: 10.1590/S0100-67622002000400010
Abstract: the objective of this work was to evaluate the efficiency of purifying and enriching wood tar creosote against wood decay after 48 months in field testing. by distillation of wood tar, the crude wood tar (creosote 1) was recovered at a temperature of 110-255 °c. a fraction of the distilled was washed with a solution of sodium bicarbonate at 9%, resulting in purified wood tar creosote (creosote 2). creosotes 1 and 2 were enriched with 3% copper naphtenate; 3% zinc naphtenate; 3% of cobalt naphtenate; 2% tbto; 2% tributil-tin tribromophenate; 2% pentachlorophenol; or 0.4% arsenic trioxide. stakes of eucalyptus grandis sapwood were treated by following the full cell process. the efficiency of wood tar creosote solutions was compared with that of coal tar creosote. the essay was established in three locations (vi?osa, ponte nova and leopoldina -minas gerais, brazil). the results showed that creosote 2 + pentaclorofenol was superior to creosotes 1 and 2 + tbto, to creosotes 1 and 2 + zinc naftenato and to pure creosote 1, being similar to coal tar creosote. creosote 2 was superior to creosote 1, only in leopoldina. in general, the average life of untreated wood was between 12 and 24 months. the average life of wood treated with creosote 1 + tbto was between 24 and 37 months, while that ofwood treated with creosote 1 + zinc naftenato, between 37 and 48 months and that of wood treated with creosote 1 + cobalt naftenato, pure creosote 2, creosote 2 + zinc naftenato or + tbto was 48 months. at this stage of research it is not possible to estimate the treated wood average life, as compared with the other tested preservative solutions, it since 60% of the stakes did not break.
Corros?o de parafusos fixados à madeira tratada com solu??es de creosoto vegetal
Paes, Juarez Benigno;Benedito Rocha, Vital;Della Lucia, Ricardo Marius;Della Lucia, Terezinha Maria Castro;
Revista árvore , 2002, DOI: 10.1590/S0100-67622002000300011
Abstract: the objective of this research was to evaluate the corrosion of screws fixed into wood treated with preservative solutions of wood tar creosote. the crude wood tar creosote was obtained through distillation of wood tar at 110 - 255oc. a fraction of this product was washed with a solution of sodium bicarbonate at 9%, resulting in purified wood tar creosote. both fractions were enriched with 3% of copper naphtenate, 3% of zinc naphtenate, 3% of cobalt naphtenate, 2% of tbto, 2% of tributhyl-tin tribromophenate, 2% of pentachlorophenol, or with 0.4% of arsenic trioxide. a total of 16 preservative solutions were prepared, of which 14 were enriched, besides the crude wood tar creosote and the purified wood tar creosote. stakes made of eucalyptus grandis sapwood were treated following the full-cell process (bethell's process). after the stakes treatment, screws of iron covered with zinc were fixed into the wood stakes. the assay was carried out in three locations (vi?osa, ponte nova and leopoldina - in zona da mata, minas gerais, brazil). the corrosiveness of solutions of wood tar creosote was compared with the one caused by coal tar creosote. the solutions with purified wood tar creosote were less corrosive than those prepared with crude wood tar creosote, being similar to the coal tar creosote.
Corrosividade causada por solu??es produzidas com creosoto vegetal
Paes, Juarez Benigno;Vital, Benedito Rocha;Della Lucia, Ricardo Marius;Della Lucia, Terezinha Maria Castro;
Revista árvore , 2002, DOI: 10.1590/S0100-67622002000500013
Abstract: the objective of this research was to evaluate the corrosiveness of preservative solutions prepared with wood tar creosote. by distilling of wood tar, crude wood tar creosote was recovered at a temperature of 100-255 oc. a fraction of this product was washed with a solution of sodium bicarbonate at 9%, resulting in purified wood tar creosote. both fractions were enriched with 3% copper naphtenate, 3% zinc naphtenate, 3% cobalt naphtenate, 2% tbto, 2% tributhyl-tin tribromophenate, 2% pentachlorophenol, or with 0.4% arsenic trioxide. a total of 16 preservative solutions were prepared of which 14 were enriched, besides the crude wood tar creosote and the purified wood tar creosote. sae 1006 steel plates were exposed for 6 hours at temperatures of 25, 45 and 100 oc, to the corrosive action of those solutions. the corrosiveness of wood tar creosote solutions was compared with that caused by coal tar creosote. the solutions with purified wood tar creosote were less corrosive than similar solutions prepared with crude wood tar creosote, although being more corrosive than the coal tar creosote.
Efeitos da purifica o e do enriquecimento do creosoto vegetal na preserva o da madeira de Eucalyptus grandis, após 48 meses de instala o do ensaio de campo
Paes Juarez Benigno,Vital Benedito Rocha,Della Lucia Ricardo Marius,Della Lucia Terezinha Maria Castro
Revista árvore , 2002,
Abstract: O objetivo deste trabalho foi avaliar a eficiência da purifica o e do enriquecimento do creosoto vegetal contra xilófagos, após 48 meses de instala o do ensaio de campo. Por destila o do alcatr o vegetal, obteve-se o creosoto vegetal bruto (creosoto 1), recuperado à temperatura de 110-255 °C. Uma fra o dos destilados foi lavada com solu o a 9% de bicarbonato de sódio, para obter o creosoto vegetal purificado (creosoto 2). Os creosotos 1 e 2 foram enriquecidos com 3% de naftenato de cobre; 3% de naftenato de zinco; 3% de naftenato de cobalto; 2% de TBTO; 2% de tribromofenato de tributil-estanho; 2% de pentaclorofenol; ou 0,4% de trióxido de arsênico. Estacas obtidas do alburno de Eucalyptus grandis foram tratadas pelo processo de célula cheia. A eficiência das solu es de creosoto vegetal foi comparada com a do creosoto mineral. O ensaio foi instalado em três localidades (Vi osa, Ponte Nova e Leopoldina). Os resultados indicam que o creosoto 2 + pentaclorofenol foi superior aos creosotos 1 e 2 + TBTO, aos creosotos 1 e 2 + naftenato de zinco e ao creosoto 1 puro, sendo semelhante ao creosoto mineral. O creosoto 2 foi superior ao creosoto 1 apenas para a localidade de Leopoldina. De modo geral, a vida média da madeira n o-tratada ficou entre 12 e 24 meses, a da madeira tratada com o creosoto 1 + TBTO entre 24 e 37 meses e a da tratada com o creosoto 1 + naftenato de zinco entre 37 e 48 meses e a com o creosoto 1 + naftenato de cobalto, creosoto 2 puro e creosoto 2 + naftenato de zinco ou TBTO foi de 48 meses. No atual estágio da pesquisa, n o é possível estimar a vida média da madeira tratada com as demais solu es preservativas testadas, pois ainda n o atingiram os 60% das estacas quebradas.
Corrosividade causada por solu es produzidas com creosoto vegetal
Paes Juarez Benigno,Vital Benedito Rocha,Della Lucia Ricardo Marius,Della Lucia Terezinha Maria Castro
Revista árvore , 2002,
Abstract: Esta pesquisa teve como objetivo avaliar a corrosividade de solu es preservativas preparadas com creosoto vegetal. Por destila o do alcatr o vegetal, obteve-se o creosoto vegetal bruto, recuperado à temperatura de 110-255 masculineC. Uma fra o deste destilado foi lavada com solu o a 9% de bicarbonato de sódio, obtendo-se o creosoto vegetal purificado. Ambas as fra es foram enriquecidas com 3% de naftenato de cobre; 3% de naftenato de zinco; 3% de naftenato de cobalto; 2% de TBTO; 2% de tribromofenato de tributil-estanho; 2% de pentaclorofenol; ou 0,4% de trióxido de arsênico. Foram preparadas 16 solu es preservativas, sendo 14 enriquecidas, além do creosoto vegetal bruto e do creosoto vegetal purificado. Placas de a o SAE 1006 foram expostas por 6 horas às temperaturas de 25, 45 e 100 masculineC, à a o corrosiva dessas solu es. A corrosividade das solu es de creosoto vegetal foi comparada à corrosividade causada pelo creosoto mineral. As solu es preparadas com creosoto vegetal purificado foram menos corrosivas que suas similares preparadas com creosoto vegetal bruto, sem, no entanto, atingir a baixa corrosividade do creosoto mineral.
Corros o de parafusos fixados à madeira tratada com solu es de creosoto vegetal
Paes Juarez Benigno,Benedito Rocha Vital,Della Lucia Ricardo Marius,Della Lucia Terezinha Maria Castro
Revista árvore , 2002,
Abstract: O objetivo desta pesquisa foi avaliar a corros o de parafusos auto-rosqueáveis fixados à madeira tratada com solu es preservativas preparadas com creosoto vegetal, em condi es de campo. Obteve-se o creosoto vegetal bruto por meio da destila o à temperatura de 110 - 255masculineC do alcatr o vegetal. Uma fra o dos destilados foi lavada com solu o a 9% de bicarbonato de sódio, obtendo-se o creosoto vegetal purificado. Ambas as fra es foram enriquecidas com 3% de naftenato de cobre; 3% de naftenato de zinco; 3% naftenato de cobalto; 2% de TBTO; 2% de tribromofenato de tubutil-estanho; 2% de pentaclorofenol; ou 0,4% de trióxido de arsênico. Foram preparadas 16 solu es, sendo 14 enriquecidas, além do creosoto vegetal bruto e do creosoto vegetal purificado. Estacas confeccionadas com madeira de alburno de Eucalyptus grandis foram tratadas pelo processo de célula- cheia (processo Bethell). Após o tratamento, parafusos auto-rosquéaveis de ferro zincado foram fixados às estacas. O ensaio foi instalado em três localidades da Zona da Mata de Minas Gerais (Vi osa, Ponte Nova e Leopoldina). A corrosividade das solu es de creosoto vegetal foi comparada à causada pelo creosoto mineral. As solu es preparadas com creosoto vegetal purificado foram menos corrosivas que suas similares preparadas com creosoto vegetal bruto, assemelhando-se ao creosoto mineral.
Painéis de partículas aglomeradas de madeira de Pinus elliottii Engelm., poliestireno (PS) e polietileno tereftalato (PET)
Maciel, Ant?nio da Silva;Vital, Benedito Rocha;Della Lúcia, Ricardo Marius;Pimenta, Alexandre Santos;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000200012
Abstract: this work aimed determine the properties of wood particleboards containing particles of polystyrene (ps) and polyethylene therephthalate (pet). three amounts of polystyrene (0, 25 and 50%), two amounts of pet/ps (5/20 and 10/40%), three amounts (0, 4 and 6%) of urea-formaldehyde or phenol-formaldehyde adhesive and three amounts of polystyrene in toluene solution (0, 4 and 6%), combined with 50, 75 or 100% of particles of pinuselliottii wood were used. layer boards measuring approximately 400 x 400 x 10 mm with density approximately equal to 0.60 g/cm3 were produced. internal bond, rupture and elasticity modulus, screw withdrawal, water absorption and thickness swelling after 24 hours of immersion were determined. the mechanical properties of all the boards were superior to the established by ansi/a 208.1-1993 standard. all wood/plastic particleboards absorbed more water than those observed in commercial boards. however, the observed thickness swelling was quite similar to the values of commercial wood particleboards. boards in which the solution of polystyrene was applied presented, in general, the best values for all the properties.
Propriedades de chapas de aglomerado confeccionadas com misturas de partículas de Eucalyptus spp e Pinus elliottii
Cabral, Carla Priscilla;Vital, Benedito Rocha;Lucia, Ricardo Marius Della;Pimenta, Alexandre Santos;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000500014
Abstract: this work aimed to evaluate properties of particleboards manufactured with particles derived from planner shavings and flakes of eucalyptus grandis, e. urophylla and e. cloeziana. pinus elliottii particles were mixed with eucalyptus particles when necessary and in an amount enough to keep boards densities at 0.70 gr/cm3. eucalyptus wood was obtained from the municipalities of ponte alta (vale do rio doce) and três marias (cerrado region), both in minas gerais state, brazil. eucalyptus grandis, e. urophylla and e. cloeziana densities collected in ponte alta were 0.55; 0.61 and 0.70 g/cm3 whereas those collected from três marias were 0.58; 0.58 and 0.69 g/cm3, respectively. the density of pinus elliottii cultivated in the region of vi?osa was 0.45 g/cm3. particles were produced by processing flakes (0.48 x 20 x 90 mm) and planner shavings in hammer mill. mean slenderness ratios were 19.87 and 4.66 for particles produced from flakes and shavings, respectively. urea-formaldehyde adhesive was applied in the proportion of 8% of particle dry mass. boards manufactured with higher amount of eucalyptus particles absorbed more water and had higher swelling and linear expansion. highest hardness and parallel compression were observed on boards manufactured with particles from shavings, whereas highest internal bond, modulus of rupture and elasticity values were found for boards fabricated with particles from flakes. boards made with particles from wood derived from três marias had higher means for parallel compression, internal bond and modulus of rupture.
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