A sponge core barrel for use in performing sponge coring and methods of assembling the sponge core barrel, as well as methods of performing sponge coring. A first set of client stations transmit uplink user data during a simultaneous uplink transmission period without sensing channel prior to transmitting the uplink user data. Performing a search to identify web sites and categories of web sites that relate to a search term also may include receiving at least one search term that then is compared with a list of recommended web sites, previously performed searches, a hierarchy of category identifiers, and terms related to one or more categories to determine whether matches exist. 3-300 m on the substrate, and an IDT electrode pattern is formed on the GaN piezoelectric single crystal thin film.