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Fe-clusters/NAC catalysts showed superior cathodic activity due to the high exposure of iron-based clusters and other active sites.

In this paper, by considerivg the stochastic process of the busy period and the idle period, and i~m)duci~ the unfinished work as a supplementary v~iable, a new vector Markov process was presented to study the hi/G/1 queue again. Through establishing and solving the density evolution equations, the busy-period dislzibufion, and the stationary distributions of waiting time and queue length were obtained. In addition, the stability condition of this queue system was given by means of an imbedded renewal process. Key words M/G/1 queue, unfinished work, vector Markov process(VMP), density evolution equations. MSC 2000 60E25, 681V120, 9O1322 [6] Cinlar E. ~c~on to Stocha~c Process [M].

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After etched by acid solution, abundant cationic vacancies appear in A sites of the perovskite structure, leading to a loose structural framework which may contribute the extra surface area, the formation of oxygen vacancies and Mn4+.