A plasma mass filter for separating low-mass particles from high-mass particles in a multi-species plasma includes a substantially cylindrically shaped barrier surrounding a chamber and defining a longitudinal axis. The undergarment is attached to the inside of a pair of pants or shorts with a hook and loop type fastener, buttons, zippers, snaps, tie strings, temporary glue or the like. The semiconductor memory device may include a temperature sensor and the temperature sensor instruction signal generator. Both of the motors are located at approximately the same place in an ejecting direction of ink from the heads to the paper, and at the same height of a transfer path of the paper or on the carriage side with respect to the transfer path. At least one second region may be formed in the superlattice including a second conductivity type dopant to define, with the at least one first region, at least one semiconductor junction. The door spanning the access opening with the door in a closed configuration and providing access to the cooking chamber when in an open configuration.