Combinations of materials are described in which high energy density active materials for negative electrodes of lithium ion batteries. The method can be used for scatter correction of detection data from a positron emission tomographic scanner. Assuming that one of the contact circuits is a reference contact circuit and the others are output contact circuits, the reference contact circuit is provided such that a distance from the initial position to a position where the reference contact circuit is turned on is smaller than that for the output contact circuits. The unified desktop enables a worker to manage both claims for unemployment insurance benefits and unemployment insurance tax payments.