recently, special type of fuel cells has been developed that operates in a dead end mode. working in this condition, the dead-end fuel cell is supplied withhydrogen almost at the same rate of consumption. it is noteworthy to mention thatall of the water transport mechanisms have been considered in this simulation.water accumulation that is directly proportional to the cell current is of a great...

The recently developed technique of field-induced droplet ionization (FIDI) is applied to study interfacial chemistry of a single droplet. In a new variation of the FIDI method, 1-2-mm-diameter droplets hang from a capillary and undergo heterogeneous reactions between solution-phase analytes and gas-phase species. Following a specified reaction time, the application of a high electric field ind...

The Viewpoint by Ran Arieli published below addresses the topic of the physiology of “mixed-gas diving.” You are invited to submit a brief commentary on this Viewpoint, which will be reviewed by Journal editors for possible publication in the Journal of Applied Physiology. Please limit your comment to 250 words and 5 peer-reviewed published references. NON-AIR OR MIXED-GAS DIVING was developed ...

Atmospheric gas saturation levels were monitored throughout a 40-km reach of the upper Colorado River during the summer and fall of 1995 to identify possible sources of gas supersaturation in the river. Gas saturation data from seven fixed sampling points and 40 random sampling points were analyzed using analysis of variance (ANOVA) and multiple regression methods. The lowest total gas saturati...

the simultaneous flow of oil and water in porous media is described by relative permeability curves, mainly derived from laboratory experiments. relative permeability is of paramount importance in predicting reservoir production performance and drive mechanisms and its value depends largely on the volume fraction of fluids present in the test samples. nowadays x-ray scanners are one of the most...

water saturation and cation exchange capacity are the most significant parameters used to calculate a hydrocarbon zone potential. in clean formations, by applying the famous archie model, which assumes that in the formation the only electric conductor is the formation water, the water saturation can be calculated. additionally, in shaly sand formations this assumption may not be true as the ion...

A new approach for measuring gas-phase methyl hydrogen peroxide [(MHP) CH(3)OOH] utilizing chemical ionization mass spectrometry is presented. Tandem mass spectrometry is used to avoid mass interferences that hindered previous attempts to measure atmospheric CH(3)OOH with CF(3)O(-) clustering chemistry. CH(3)OOH has been successfully measured in situ using this technique during both airborne an...

Fine-grained natural gas hydrate (NGH) reservoirs are widely distributed across the world and bear more than 90% of global NGH. However, it is difficult to exploit this kind NGH reservoir economically environmentally using conventional methods. Water-jet cutting an efficient friendly technique for mining such reservoirs, as production process does not depend on mass heat transfer within formati...