A data protection system that integrates a database with Windows Explorer in the Microsoft Windows 9X and NT Environments that mimics the Windows Explorer user interface, enabling the user to apply already known use paradigms. The invention may include receiving a list of recognized symbol strings of one or more recognized entries. A catalyst for polymerization of conjugated diene comprises an yttrium compound; an ionic compound including a non-coordinate anion and a cation; and an organometallic compound including an element selected from the groups 2, 12 and 13 of the periodic table. Within a preset window after the maxQRS point, the processor searches for a sample at which the second finite difference is less than a threshold that is a function of average QRS amplitude.