Psychrometer
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. ANÁLISE METROLÓGICA DO COMPORTAMENTO TRANSIENTE DE UM PSICRÔMETRO DO TIPO BULBO ÚMIDO E BULBO SECO / METROLOGICAL ANALYSIS OF THE TRANSIENT BEHAVIOR OF A WET BULB AND DRY BULB PSYCHROMETER
Este trabalho apresenta um estudo do comportamento transiente de um medidor de umidade tipo bulbo úmido e bulbo seco, assim como a determinação da umidade do ar em diferentes condições ambientais, que foram simuladas em laboratório. O psicrômetro do tipo bulbo úmido e bulbo seco é amplamente utilizado na indústria de ar condicionado, na monitoraç�
Publicado em: 2005
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2. Balanço de energia e evapotranspiração de cafezal adensado em crescimento sob irrigação localizada. / Energy balance and evapotranspiration in a high density young coffee under located irrigation.
The objectives of this study were to evaluate the magnitude of global evapotranspiration (ETc) in a high density young coffee crop (3.5mx0.9m) under drip irrigation, the ETc partition considering hedgerows and interrows, and the partition of the available radiant energy between sensible and latent heat fluxes. The experiments were conducted from September 20
Publicado em: 2005
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3. Pressure Probe and Isopiestic Psychrometer Measure Similar Turgor 1
Turgor measured with a miniature pressure probe was compared to that measured with an isopiestic thermocouple psychrometer in mature regions of soybean (Glycine max [L.] Merr.) stems. The probe measured turgor directly in cells of intact stems whereas the psychrometer measured the water potential and osmotic potential of excised stem segments and turgor was
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4. A CONVENIENT PSYCHROMETER
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5. A Differential Psychrometer for Continuous Measurements of Transpiration 1
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6. Measurement of Energy Status of Water in Plants With a Thermocouple Psychrometer 12
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7. Comparison of Pressure Chamber and Thermocouple Psychrometer Determinations of Leaf Water Status in Tomato
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8. Chloroplast Response to Low Leaf Water Potentials: I. Role of Turgor 1
The effect of decreases in turgor on chloroplast activity was studied by measuring the photochemical activity of intact sunflower (Helianthus annuus L. cv. Russian Mammoth) leaves having low water potentials. Leaf turgor, calculated from leaf water potential and osmotic potential, was found to be affected by the dilution of cell contents by water in the cell
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9. Direct Demonstration of a Growth-Induced Water Potential Gradient.
When transpiration is negligible, water potentials in growing tissues are less than those in mature tissues and have been predicted to form gradients that move water into the enlarging cells. To determine directly whether the gradients exist, we measured water potentials along the radius of stems of intact soybean (Glycine max [L.] Merr.) seedlings growing i
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10. The Osmotic Potential of Polyethylene Glycol 6000 1
Osmotic potential (ψs) of aqueous solutions of polyethylene glycol 6000 (PEG-6000) was curvilinearly related to concentration. At given concentrations, ψs increased linearly with temperature. The effects of concentration and temperature on ψs of PEG-6000 solutions differ from those for most salts and sugars and apparently are related to structural changes
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11. Water Potential Gradient in a Tall Sequoiadendron
With an elevator installed in a 90-meter tall Sequoiadendron to collect the samples, xylem pressure potential measurements were made approximately every 15 meters along 60 meters of the tree's height. The measured gradient was about −0.8 bar per 10 meters of height, i.e., less than the hydrostatic gradient. Correction of the xylem pressure potential data b
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12. Measuring Water Potential (Activity) from Free Water to Oven Dryness 1
Water activities (potentials) in plant materials were measured over the range from free water to oven dryness with a Spanner thermocouple psychrometer. In a two-step procedure, water was first condensed on the thermocouple junction for several minutes. The sample was then inserted under the wet thermocouple and the maximum psychrometric cooling was measured