Techniques for facilitating cell search by user equipments in a wireless communication system are described. According to the energy absorption structure of the invention, when a load is applied to the energy absorption structure, the relative displacement between a first member and an energy absorption member is suppressed by a displacement suppressing member that connect the first member with the energy absorption member. A database including a plurality of reference words that relate to listings provided by the network-based commerce system may then be investigated. Using the spatial orientation data, the processor determines in real-time the actual orientation of the surgical instrument relative to the anatomical reference points. The sorbent comprises the following chemical structure:wherein at least one of R1, R2, and R3 comprises a primary amine group and wherein the sorbent is not melamine and does not comprise the following chemical structure:Sorbents for removing carbon dioxide are also disclosed.