A non-adiabatic fixed bed auto-cyclic reactor (ACR) consisting of two counter-current concentric compartments was designed and built for removing low concentrations of methane from exhaust gases from natural gas engines.
In 2003 and 2006, concentrations of methane were unexpectedly spotted in three specific regions of Mars.
Let's start with the basics: Globally, concentrations of methane in the atmosphere, just like concentrations of carbon dioxide, are rising.
Eleven families left their homes after technicians advised them that concentrations of methane at explosive levels had been measured.
Ambient air concentrations of methane are usually less than two parts per million.
Atmospheric concentrations of methane have more than doubled since pre-industrial times, Dr. Heimann wrote.
And company executives say that it does so at low concentrations of methane, 1.5 percent.
During the same period, concentrations of methane, an even more powerful (but more short-lived) greenhouse gas, have more than doubled, from.78 p.p.m. to 1.76 p.p.m.
State energy officials had warned of the site, a former oil field, and it has been found to have dangerous concentrations of methane and hydrogen sulfide.
Concentrations of methane in the atmosphere over those two years alone rose by more than 20 parts per billion, bringing the total to 1,830ppb.
This weakening of explosions was more efficacious for higher concentrations of methane than it was for lower concentrations of methane.
