نتایج جستجو برای: flow resistance
تعداد نتایج: 840936 فیلتر نتایج به سال:
Aortic valve resistance has been proposed to represent the severity of aortic stenosis because some studies observed that it was less affected by change in flow than the valve-effective orifice area, but this issue remains controversial. The objective of this study was to systematically analyze the theoretical and practical determinants of these parameters in relation to changes in flow. Valve ...
The prevalence of irregular breathing during sleep is age and gender dependent, but the reason for this is unknown. This study tested the hypothesis that older men have a greater sleep-related increase in respiratory resistance. In 48 healthy subjects, 12 in each of four groups of younger and older men and women, airway resistance was measured during wakefulness and sleep using a mask, pneumota...
Flow resistance in open channels determines the average flow velocity a river, with important implications for downstream and at-a-station hydraulic geometry sediment transport natural channels. However, steep mountain is challenging to understand predict due heterogeneous channel morphology spatially variable flow. Using double-averaging approach appropriate very rough channels, width, reach, ...
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