The present invention relates to a mayenite-type compound in which a part of Ca of a mayenite-type compound containing Ca, Al and oxygen is substituted by at least one kind of an atom M selected from the group consisting of Be, Mg and Sr, in which the mayenite-type compound has an atom number ratio represented by M of from 0. A non-rotating ring carries a belt driven by a motor. The pump casing has flat inner surfaces facing both end surfaces of each of the inner rotor and the outer rotor. In another example, the method is applied to the allocation of telephone help in a way to improve customer satisfaction. A designator is associated with the region-of-interest in the image, the designator being configured to present information related to the object.