NO in N2 gas was removed by injecting ammonia radicals, which were externally generated by flowing the NH3 gas diluted with Ar gas through dielectric barrier discharge with a one-cycle sinusoidal-wave power source. The NO reduction for changes in both the applied voltage and the repetition rate was well correlated with the discharge power, which was proportional to the total discharge time per unit time. There was an optimum NH3 concentration in the narrow concentration window for the energy efficiency of NO reduction at a fixed discharge power. The maximum energy efficiency was obtained at small values of the NH3 concentration and the discharge power. The low NH3 concentration effectively increased the energy efficiency by drastically decreasing the discharge-firing voltage.
A relationship is established between the king model in a random positive and negative magnetic field on a lattice with p =f. At T = O each percolation cluster gives rise to a first-order transition at a different value of the field. There is a significant difference in behaviour between lattices for which p , < f which have an infinite cluster, and p c > i which do not. By considering the Bethe lattice and allowing the coordination number to become large, the results of the mean field approximation are reproduced. The above considerations do not apply to a Gaussian distribution of fields, and the absence of a first-order transition can be understood in this case. Since large clusters overturn for small fields there are clear indications of metastable behaviour.
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