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Registros recuperados: 5
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A low cost apparatus for measuring the xylem hydraulic conductance in plants Bragantia
Pereira,Luciano; Mazzafera,Paulo.
Plant yield and resistance to drought are directly related to the efficiency of the xylem hydraulic conductance and the ability of this system to avoid interrupting the flow of water. In this paper we described in detail the assembling of an apparatus proposed by TYREE et al. (2002), and its calibration, as well as low cost adaptations that make the equipment accessible for everyone working in this research area. The apparatus allows measuring the conductance in parts of roots or shoots (root ramifications or branches), or in the whole system, in the case of small plants or seedlings. The apparatus can also be used to measure the reduction of conductance by embolism of the xylem vessels. Data on the hydraulic conductance of eucalyptus seedlings obtained...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water; Conductivity; Cavitation; Embolism.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000400017
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Characterisation of Sanguinhal Mire, Terceira Island (Azores): a protected quaking bog habitat Acta Botanica
Mendes,Cândida; Dias,Eduardo.
The Azores archipelago in the North Atlantic is an important area for biodiversity because it is rich in rare species and habitats, and almost undisturbed. Sanguinhal mire was originally a lake that evolved through paludification into a peat habitat. It is located inside Nature 2000 (European Union for Protection of Nature and Biodiversity, Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora, Habitat Directive Annex I(b) habitat 7140) area of Santa Bárbara and Pico Alto Mountains on the island of Terceira, and it is a good example of a basin peatland type that was first discovered in 1998. This paper provides baseline information on its flora, vegetation communities, structure, surface hydrology...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conductivity; European Habitats Directive; Hydrology; PH; Vegetation.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000300022
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Determinação experimental da condutividade e difusividade térmica de grãos em regime permanente Ciênc. Tecnol. Aliment.
PARK,Kil Jin; ALONSO,Luís Felipe Toro; NUNES,Alexandre Sznelwar.
Foram determinadas experimentalmente em regime permanente a difusividade e a condutividade térmica de materiais biológicos. O equipamento com termopares de Cobre-Constantan dispostos radialmente no interior do cilindro conectados a uma unidade registradora de dados acoplados a um microcomputador fornece a leitura das temperaturas dos termopares. Os valores obtidos de difusividade (1,12x10-4 m2/s) e condutividade térmica (0,138W/moC) para o trigo (Triticum aestivum) e os valores de difusividade (1,67x10-4 m2/s) e condutividade térmica (0,122W/moC) para o arroz em casca (Orysa sativa)concordam com os valores encontrados nos ASAE STANDARTS [1], demonstrando a funcionalidade do equipamento.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conductivity; Diffusivity; Physical properties.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611999000200020
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Determining the In Situ Apparent Thermal Diffusivity of a Sandy Soil Rev. Bras. Ciênc. Solo
Aguilar,Oscar Fernando Silva; Arredondo,Jorge Alberto Andaverde; Trujillo,Beatris Adriana Escobedo; Fundora,Artemio Jesús Benitez.
ABSTRACT: The thermal wave amplitude method is used to determine soil thermal diffusivity in situ for a sandy soil in Mexico (Coatzacoalcos, Veracruz). Soil diurnal temperature fluctuations were measured from depths of 0.05 to 0.65 m, in 0.01 m increments, during the months of April and August. Five mean diffusivity values were obtained experimentally, corresponding to the different depths combination. The soil thermal diffusivity ranged between 2.26 × 10−7 and 8.71 × 10−7 m2 s−1. The diffusivity values obtained are within the absolute ranges reported in the literature. A positive linear effect between the diffusivity values and depth was observed on a homogeneous sandy soil. These increments are due to the soil moisture variations and the volumetric...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geothermal; Thermal properties; Conductivity; Error propagation.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100425
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Etalonnage de capteurs de température et conductivité, et détermination des incertitudes de mesure associées ArchiMer
Jacqueline, Franck.
The first aim of this experimentation is to calculate uncertainty of measurement fo Ysi 6560 and wTw LF 197's sensors. in a second time we shall try to quantify the influence of the choice of the calibration point for the quality of the measurements, in function of the environment measured.
Tipo: Text Palavras-chave: Incertitude de mesure; Calibrage; Température; Salinité; Conductivité.; Uncertainity; Gauging; Temperature; Salinity; Conductivity.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00175/28618/27046.pdf
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