in this work, the adsorption of carbon dioxide from model flue gas on different adsorbents has been investigated. using simplified modeling, parameters such as the total mass transfer coefficient and the effective diffusivity have been determined. experiments were carried out in two sections: firstly, adsorption of pure carbon dioxide on different adsorbents was measured at pressures ranging fr...

BACKGROUND The middle cerebral artery supplies long end-artery branches to perfuse the deep white matter and shorter peripheral branches to perfuse cortical and subcortical tissues. A generalized vasodilatory stimulus such as carbon dioxide not only results in an increase in flow to these various tissue beds but also redistribution among them. We employed a fast step increase in carbon dioxide ...

BACKGROUND Propofol has a depressant effect on metabolic ventilatory control, causing depression of the ventilatory response to acute isocapnic hypoxia, a response mediated via the peripheral chemoreflex loop. In this study, the authors examined the effect of sedative concentrations of propofol on the dynamic ventilatory response to carbon dioxide to obtain information about the respiratory sit...

BACKGROUND Asthmatic individuals constitute a large sub-population that is often considered particularly susceptible to the deleterious effects of inhalation of airborne chemicals. However, for most such chemicals information on asthmatics is lacking and inter-individual assessment factors (AFs) of 3-25 have been proposed for use in the derivation of health-based guideline values. OBJECTIVE T...

Carbon dioxide efflux and soil microenvironmental factors were measured diurnally in Carex aquatilusand Eriophorum angustifolium-dominated riparian tundra communities to determine the relative importance of soil environmental factors controlling ecosystem carbon dioxide exchange with the atmosphere. Measurements were made weekly between 18 June and 24 July 1990. Diurnal patterns in carbon dioxi...

C-13 isotope fractionation in the decarboxylation of phenylpropiolic acid (PPA) in the 10% solution of diphosphoric acid (H4P2O7) in orthophosphoric acid (H3PO4) and in the solution of diphosphoric acid in metaphosphoric acid (HPO3) has been studied between 20–140 C (293.16–413.16). The initial C fractionation observed in the decarboxylation of PPA in 10% solution of H4P2O7 in H3PO4 in the temp...

A continuous flow system was used to study the interactions between carbon dioxide and ethylene in intact sunflower (Helianthus annuus L.) plants. An increase in the concentration of carbon dioxide above the ambient level (0.033%) in the atmosphere surrounding the plants increased the rate of ethylene production, and a decrease in carbon dioxide concentration resulted in a decrease in the rate ...

The efficiency of the carbon dioxide absorption by soda lime was determined in the following way. (1) " Circle " breathing. In six experiments, a subject breathing through a Waters canister fully packed with 425 g of fresh soda lime was connected to a closed circuit spirometer as described by Erikson et al. (1951). The expired air then passed the canister before entering the spirometer where th...