A method of controlling the operation of a blasting system which includes the steps of monitoring for the occurrence of electromagnetic interference within a defined zone and initiating an alarm upon detection of such interference wherein the initiation of the alarm can automatically inhibit or suspend the operation of the blasting system. The database query user interface includes a query text string input from a user including one or more terms of a chunk expression language format. The bone cutting template can include a plurality of length stamps along the body. A text of a part of the content may be used to search local and external sources to find resulting data associated with the text. Each side arm is formed with a single closed shape cross section and is slidably received within a different vertical support of the pair of vertical supports. The piezoelectric layers contain voids, but the total thickness in the stacking direction of the voids contained in any one piezoelectric layer is not more than \u2153 of the thickness in the stacking direction of the piezoelectric layer and the thickness in the stacking direction of each of the voids is not more than 50 \u03bcm.