This work focuses on identifying the rate-determining step of oxygen transport through La0.5Sr0.5Fe0.7Ga0.3O3-? membranes with symmetric and asymmetric architectures. The best semipermeation fluxes are 3.4 10?3 mol. m-2.s-1 6.3 at 900 °C for membrane a modified surface. surface leads to an increase approximately 7 times flux compared that obtained dense without modification. also shows is mainl...

The video of a growing fullerene within a carbon nanotube, initiated by a tungsten catalyst, provides a dramatic realization of a complex nanoscale process. While there may be many detailed models which can account for this growth, we propose one of the simplest possible models which is consistent with the major observed features of the growth process. In particular, we assume that the fulleren...

[NiFe]-hydrogenases are fascinating biological catalysts with potential application in biofuel cells. However, a severe problem in practical application is the strong sensitivity of hydrogenase to gaseous inhibitor molecules such as CO and O(2). Recently, a number of successful protein engineering studies have been reported that aimed at lowering the access of diatomic inhibitors to the active ...

Gaseous microemboli (GME) are an abnormal physiological occurrence during cardiopulmonary bypass and extracorporeal membrane oxygenation (ECMO). Several studies have correlated negative sequelae with exposure to increased amounts of GME. Hypobaric oxygenation is effective at eliminating GME in hollow-fiber microporous membrane oxygenators. However, hollow-fiber diffusion membrane oxygenators, w...

The effect of gaseous ozone and hot water, alone or in combination, on the sensory and microbial quality of cantaloupe melon was investigated. Escherichia coli O157:H7 transmission from the rind to edible melon flesh during cutting practices was also investigated. Four different treatments consisting of hot water (75 degrees C, 1min), gaseous ozone (10,000ppm, 30min), gaseous ozone supplied by ...

Abstract The generation of magnetohydrodynamic (MHD) waves and their instabilities are studied in galactic gaseous rotating plasmas with the effects magnetic field, self gravity, diffusion-convection cosmic rays as well gas cosmic-ray pressures. coupling Jeans, Alfvén magnetosonic waves, conditions damping or instability three different cases, namely when propagation direction is perpendicular,...