A method is disclosed for the operation of a high-power electron beam for the vaporization of materials in a target. The method of forming the arcuate chuckwall comprises the steps of providing a partially formed can end, providing an upper tooling having an annular, generally arcuate segment, and providing a lower tooling having a circumferential, generally arcuate, outwardly convex segment in at least partial alignment with the annular, generally arcuate segment of the upper tooling. The studs and traction elements being so constructed and arranged to interact in use of the footwear. The HJO can also be used to produce a semisolid, self-emulsified jojoba oil, obtained by emulsifying the HJO in jojoba oil. Retrieved speech-sound data of a student is scored using a speech-sound scoring system and a weighted average operation is performed to the score of the speech-sound data of the student according to a corresponding adjusting weight, thereby generating the final score of the speech-sound data of the student. The antivirus scanning is optimized for each scan by selecting an algorithm for that scan based on a determined overall likelihood that the downloaded data contains malicious code.