BACKGROUND The C50 of remifentanil for ventilatory depression has been previously determined using inspired carbon dioxide and stimulated ventilation, which may not describe the clinically relevant situation in which ventilatory depression occurs in the absence of inspired carbon dioxide. The authors applied indirect effect modeling to non-steady state Paco2 data in the absence of inspired carb...

The fullerene-50 is a 'magic number' cage according to the 2(N + 1)(2) rule. For the three lowest isomers of C50 with trigonal and pentagonal symmetries, we calculate the sphericity index, the spherical parentage of the occupied π-orbitals, and the current density in an applied magnetic field. The minimal energy isomer, with D3 symmetry, comes closest to a spherical aromat or a superaromat. In ...

In order to compare and investigate the sulfuric acid corrosion resistance of concrete for PHC pipe piles two kinds commonly used in engineering, accelerated tests were conducted on specimens with three different strength grades C30, C50, C80 a solution pH ≈ 0.85. The appearance was observed, changes mass loss percentage, depth, stress–stain curves under uniaxial compressive loading calculated ...

BACKGROUND Few studies address the dynamic effect of opioids on respiration. Models with intact feedback control of carbon dioxide on ventilation (non-steady-state models) that correctly incorporate the complex interaction among drug concentration, end-tidal partial pressure of carbon dioxide concentration, and ventilation yield reliable descriptions and predictions of the behavior of opioids. ...

There is a shortage of river sand and large number phonolite deposits around Nairobi, Kenya, but the quality manufactured made from poor. In this paper, effects on performance C30 C50 concrete are studied through tests mixture performance, mechanical properties durability. The results showed that compared with prepared sand, dosage required superplasticizer in preparation using was higher, flui...