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Novel imaging strategies in the scanning electron microscope aimed at significantly improved image contrast of second phases in metal alloys are described. These include the use of low accelerating voltages, small working distances, and a novel detection system. Contrast is assessed as a function of voltage and optimized imaging conditions which result in much improved image quality are presented. These strategies are applied to two precipitation hardened Ni-base alloys, a cast single crystal and a hot isostatically pressed sample.The tra

https://www.selleckchem.com/pr....oducts/cfi-400945.ht
Randomized controlled trials have been unable to detect a cardiovascular benefit of continuous positive airway pressure (CPAP) in unselected patients with obstructive sleep apnea (OSA). We hypothesize that deleterious cardiovascular outcomes are concentrated in a subgroup of patients with heightened apnea/hypopnea-related pulse rate response. We measured the pulse rate response to apneas/hypopneas (∆HR) in the Multi-Ethnic Study of Atherosclerosis (MESA, N=1395) and the Sleep Heart Health Study (SHHS, N=4575). MESA data were used to