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Abstract  

The gas transport system (GTS) brings short-lived radioactive nuclides to low back-ground areas for chemical separation and/or on-line α-, γ- and X-ray analysis. A pressure difference of a few Torr (3–5) is enough to maintain the transport, thus eliminating the need for costly pumping systems and making it possible to perform chemistry at atmospheric pressure. This technique was applied to a variety of radioactive sources. There is some Z-dependence on the transportation efficiency for the various transported nuclides as a function of the transporting gas and extracting solvent.

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Abstract  

Parameters of carbon allocation dynamics in plants were measured using11CO2 and tracer kinetics techniques. Mechanical agitation reduced carbon export rate by 33% in cotton seedling's leaf, while storage rate and export pool size increased. Carbon storage and export rates of C4 bunch grasses were higher in the afternoon than in the morning inspite of the decrease in CER.Water stress of cotton seedlings caused reduction in carbon export rate, and increase in exportable products concentrations and rate of storage. By the third stress day, measurable decreases in CER, transpiration, export rate and export pool size were recorded.

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