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| Registros recuperados: 36 | |
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| Jiménez Noriega, Mayte Stefany. |
| Las condiciones ambientales asociadas a gradientes altitudinales inducen modificaciones de las características morfo-anatómicas de las especies que ahí se encuentran. Las variaciones morfo-anatómicas en regiones intertropicales han sido poco documentadas. Se espera que los patrones relacionados con estos gradientes altitudinales serán similares a aquellos registrados en regiones fuera de la zona intertropical. Se estudiaron seis especies (Acaena elongata, Alchemilla procumbens, Geranium seemannii, Lupinus montanus, Ribes ciliatum y Symphoricarpos microphyllus) que se distribuyen en el gradiente altitudinal del Cerro Tláloc, Estado de México con el objetivo de reconocer y evaluar las modificaciones morfo-anatómicas asociadas al gradiente. Se recolectaron... |
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Palavras-chave: Anatomía; Morfología; Variación; Gradientes altitudinales; Madera; Anatomy; Morphology; Altitude; Variation; Altitudinal gradients; Wood; Botánica; Maestría. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2294 |
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| Galván Escobedo, Iris Grisel. |
| El Museo Nacional de las Culturas (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734 sobre los restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio, tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región y el posible uso de plantas. Se analizaron 50 muestras de... |
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Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/142 |
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| Galván Escobedo, Iris Grisel. |
| El Museo Nacional de las Culturas (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734 sobre los restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio, tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región y el posible uso de plantas. Se analizaron 50 muestras de... |
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Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/142 |
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| Christoforo,André L.; Panzera,Tulio H.; Neto Junior,Carlito Calil; Demarzo,Mauro A.; Ribeiro Filho,Sérgio L. M.; Toniolo,Luiz E.; Amstalden,Rogério A. S.; Lahr,Francisco A. R.. |
| This study aims to present an alternative calculation methodology based on the Least Squares Method for determining the modulus of elasticity in bending wooden beams of structural dimensions. The equations developed require knowledge of three or five points measured in displacements along the piece, allowing greater reliability on the response variable, using the statistical bending test at three points and non-destructively, resulting from imposition of measures from small displacements L/300 and L/200, the largest being stipulated by the Brazilian norm NBR 7190:1997. The woods tested were Angico, Cumaru, Garapa and Jatoba. Besides obtaining the modulus of elasticity through the alternative methodology proposed, these were also obtained employing the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wood; Beam theory; Modulus of elasticity; Least Squares Method. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100016 |
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| Christoforo,André L.; Panzera,Tulio H.; Lahr,Francisco A. R.. |
| ABSTRACT According to the ABNT NBR 7190: 1997 standard, tensile strength of wood samples shall be defined as the ratio between the ultimate strength from a stress test and the specimen cross-sectional area (350 mm2). However, due to the complex wood anatomy and experimental difficulties, the fractured surface in tested samples are not perpendicular to the loading direction; therefore, such fractured surface becomes larger than the sample cross section, overestimating tensile strength by this method. Using an alternative approach, we aimed to determine the approximate fracture surface of wood specimens subjected to tensile test. For this purpose, we used the least square method to estimate tensile strength of four hardwood species, which were equally... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tensile Strength; Wood; Hardwood; Least Square Method. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400533 |
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| Christoforo,André L.; Almeida,Andrea de S.; Lanini,Tamiris L. S.; Nogueira,Rodrigo de S.; Lahr,Francisco A. R.. |
| ABSTRACT For safety reasons, wood strength values, essential for structural dimensioning, are calculated based on the characteristic value, which corresponds to the 5% percentile of a given probability distribution model. For small samples, the Brazilian normative document ABNT NBR 7190 establishes an estimator of the characteristic wood strength, which can provide a significantly different result from the characteristic value coming from a suitable model of probability distribution. The main objective of this study was to evaluate the best probability distribution model (normal, lognormal, Weibull, and exponential) and the subsequent calculation of the characteristic value indicated by ABNT NBR 7190 (1997), allowing to evaluate its accuracy, being also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wood; Compression; Traction; Shear; Probability distribution; Characteristic value. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000100127 |
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| MORAES NETO, S. P. de; TELES, R. F.; RODRIGUES, T. O.; VALE, A. T. do; SOUZA, M. R.. |
| Pinus caribaea var. hondurensis é uma espécie tropical que ocorre naturalmente nas terras baixas da América Central e no Leste do México. No Brasil, existem plantios comerciais dessa espécie para fi ns de serraria, resina e celulose, especialmente. Para seu uso em estruturas, existe a necessidade do conhecimento de suas propriedades físicas e mecânicas. As propriedades físicas variam, signifi cativamente, entre espécies, entre árvores de uma mesma espécie e, mesmo, entre diferentes partes de uma mesma árvore. Este trabalho tem como objetivo analisar as variações das propriedades físicas da madeira de cinco procedências de P. caribaea var. hondurensis. Para tanto, amostras foram retiradas para teste quando as árvores tinham 23 anos de idade. A procedência... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Cerrado; Plantio; Madeira.; Pinus caribaea var. hondurensis; Wood; Pinus.. |
| Ano: 2009 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/661552 |
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| AZEVEDO, C. P. de; DUNISCH, O.; FRANCA, M. B.; NEVES, A. C. C. das; BAUCH, J.; POLACZEK, S.; VAN LEEUWEN, J.. |
| The present work was carried out with tree sumauma's tree (nativa, adult and young trees) cultivated in floodplains (varzeas) and uplands (terra firme) ecosystem, having as objective, obtain information about growth patterns of the species and to correlate them into different environmental conditions (floodplain and upland) as well as investigate anatomic and physical parameters of the wood, purposing correlate the wood quality of adult native trees, with young tree's wood, cultivated in floodplain and upland. |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Sumauma; Brasil; Amazonas; Manaus; Anatomia; Ceiba Pentandra; Madeira; Paineira; Várzea; Plant anatomy; Wood. |
| Ano: 1998 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669646 |
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| Zeppilli, Daniela; Vanreusel, Ann; Pradillon, Florence; Fuchs, Sandra; Mandon, Perrine; James, Tristan; Sarrazin, Jozee. |
| Despite the fragmented nature of hydrothermal vent (HV) fields, nascent vent sites are rapidly colonized by a pool of regional species. While succession of large animals at vents is relatively well established, we lack information on the associated meiofauna, in particular, on nematodes. The aim of the present study is to investigate the process of colonisation after 9 months of organic (wood and bone) and inorganic (slate) substrata by nematode assemblages deployed at the Eiffel Tower hydrothermal edifice on the Lucky Strike vent field on the Mid-Atlantic Ridge (MAR), at varying distances from visible hydrothermal activity. Abundance, biomass and diversity of colonising nematodes were compared with the results from an earlier similar two-year experiment.... |
| Tipo: Text |
Palavras-chave: Nematodes; Colonization substrata; Wood; Bone; Slate; Mid-Atlantic Ridge; Hydrothermal vents. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00278/38939/37520.pdf |
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| Mathenge, C.; Dahdouh-Guebas, F.; Kairo, J.G.; Koedam, N.. |
| Mida Creek (Kenya) comprises mangrove forests and other marine resources that are of economic, ecological and environmental importance to the local village communities. In total 116 households (100 of which could be used for numerical analysis), which are estimated to correspond to a coverage of ca. 30 % of the total Mida Creek population, were interviewed to assess the human reliance on mangrove resources in Mida Creek. The survey indicates that mangroves are a major resource of wood for house construction, fuelwood, charcoal and boat building. Minor uses of mangrove products include pharmaceutical and medicinal applications, tanning material and furniture making. Rhizophora mucronata, Ceriops tagal and Bruguiera gymnorrhiza are the major resources... |
| Tipo: Journal Contribution |
Palavras-chave: Mangrove; Survey analysis; Ethnobotany; Wood; Kenya; Mangroves; Wood; Http://aims.fao.org/aos/agrovoc/c_8421. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/803 |
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| Cruz, M.. |
| Del análisis de 12 tipos de diferentes maderas expuestas al medio marino, durante 3, 8 y 12 meses, entre Julio de 1984 y Junio de 1985; en cinco puertos de la costa Ecuatoriana, se encontró 8217 paletas, que pertenecen a 14 especies de moluscos bivalvos perforadores; de las cuales 13 pertenecen a la familia TEREDINIDAE y una a PHOLADIDA. Las especies más abundantes fueron: teredo fucífera con el 33%; Bankia gouldi con el 32% y Bankia orcutti con el 29,9%. entre las 14 especies encontradas en los cinco puertos estudiados. Bankia destructa fué la única especies que se presentó en todos los puertos o estaciones. En la costa Ecuatoriana, después de tres meses de exposición de las maderas al medio amrino, la especie más dominante fue Bankia orcutti, con el... |
| Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Fouling organisms; Harbours; Wood; Wood. |
| Ano: 1992 |
URL: http://hdl.handle.net/1834/2185 |
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| Registros recuperados: 36 | |
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