A method for casting a diafram having inner and outer rings with preformed vanes circumferentially spaced therebetween is disclosed. It is possible that a small amount of niobium oxide is contained in the titanium oxide, or a niobium oxide film is provided as an underlying film. 5 grams of soy protein per serving. When the number of batteries increases, one can expand the system in a modularized way to prevent inconvenience of circuit designs.