A convertible device that converts between an activity mat and a storage container to capture and store numerous articles. There are two level mapping tables to reduce overhead of mapping table management. A particulate collection surface is positioned within the air flow channel in a downstream direction from the plurality of point ionization sources. Furthermore, the video coder derives a temporal motion vector predictor from the co-located block and may determine the temporal motion vector predictor has sub-pixel precision. This invention can be applied to zigzag type, injection molded type and metal type fastener elements. Pretreatment with the sealing coating reduces the number of water molecules interacting with the electrolyte, enhancing the breakdown voltage of the capacitors.