Adaptation to C02 produces a typical breathing pattern of increased tidal volume and lowered respiratory rate. Anatomical and physiological deadspace, as well as arterial-alveolar C02 and 02 gradients, are increased under these condions. The relationship of these findings with the well known lowered respiratory response to high C02 concentrations after 0O2 adaptation is discussed. Evidence for ...

Study objectives: To investigate the etiology of posthyperventilation (post-HV) hypoxemia following voluntary hyperventilation (VHV), we examined the effects of hypocapnic (hypo-C02) and isocapnic (iso-C02) VHV on the hypoxic ventilatory response (02-response) and on the sensation of breathlessness during the 02-response. Methods: 02-responses and visual analog scale (VAS) scores for estimating...

Reducing C02 emissions for addressing climate change concerns is becoming increasingly important as the C02 concentration in the atmosphere has increased rapidly since the industrial revolution. Many mitigation methods, including C02 sequestration and novel C02 utilization, are currently-under investigation. Most of these processes require C02 in a concentrated form. However the C02 from large ...

This study, which developed a laboratory prototype of a hermetic C02 compressor, was motivated by three primary factors. First, the C02 cycle is important because of global concern about ozone depletion and global wanning. Second, the leak tightness, efficiency, size and weight of hermetic motor-driven compressors make them preferable to open-type compressors for conventional residentiallcommer...

Rice (Oryza sativa cv. Jindao 1187) was grown in open-top chambers which contained ambient and enriched C02. C02 elevation stimulated rice tillering during early vegetative stage. However, panicle dry weight per plant did not change at maturity stage. Root biomass was enhanced by high COz. Root / shoot ratio was increased under high C02 at maturity, indicating more carbon allocation to the belo...

Over the last decades overheating in buildings has become a major concern. The situation is expected to worsen due current rate of climate change. Many efforts have been made evaluate future thermal performance and cooling technologies. In this paper, term “climate change resistivity” strategies defined, calculation method provided. A comprehensive simulation-based framework then introduced, en...

We measured forest floor C02 flux in three age classes of forest in the southern Appalachians: 20-year-old, 85-year-old, and old-growth. Our objectives were to quantify differences in forest floor C02 flux among age classes, and determine the relative importance of abiotic and biotic driving variables. Forest floor C02 flux was measured using an openflow infrared gas analyzer measurement system...