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SOFC stack for residential SOFC system is improved due to cell optimization and reduction of size and weight of the stack. A power density of 1.6 W/cm2 is obtained at 0.7 V with button cell due to the cathode optimization. The cathode optimization is successfully applied to fabrication of a large cell that has an active electrode area of 100 cm2. An integrated power stack with 18 large cells shows an output power of 1.1 kW and DC power efficiency of 62 % (LHV) when the fuel utilization is 80 % in the measurement at 700 ºC with methane fuel.

The object of this paper is to give a general theorem which implies Izumi's Theorem and Kanno's Theorem on the absolute Horlund summability factors of Fourier series and deduce to several known and new results from the theorem.

The purpose of this note is to prove the Walsh analogue of results due to M. Kinukawa [3] and an extension of the theorem on contraction of C. Watari [4].We begin with some notations and definitions:for every m and n.The Rademacher functions are defined by φ β (*) = l (0^*