A method and system whereby users can easily provide search criteria without knowing the syntax required to search a target data repository and without understanding how to construct a boolean search, and whereby novice users are made aware of search operations that will help them find their desired result. One or two cover panels may be secured onto the base plates and each may include one or more further patterns arranged corresponding to the patterns of the base plates for forming different patterns when viewing from different angles. Also, the invention relates to a system which includes a vendor tracking system comprising an industrial operator interface, with communication, local data processing, and data storage capabilities, which provide an efficient information resource for service and product control. It is believed that the anion-\u03c0 interaction results in a charge transfer process between the fluoride anion and the NDI unit, resulting in a number of measurable effects. A charge current may be sensed between the enabled DC output and the battery output to control charging of the battery with a pulse-width modulation operation by controlling the selective coupling of the enabled DC output to the battery output. 83CuO2 providing X-ray diffraction powder spectra that correspond, for the CaCuO2 compound, to JCPDS card 48-197 and, for the Ca0.