Abstract: Methods for constructing multi-walled carbon nanotube (MWCNT) antenna arrays, may include: variable doping of the MWCNTs, forming light pipes with layers of variable dielectric glass, forming geometric diodes on full-wave rectified devices that propagate both electrons and holes, using clear conductive ground plans to form windows that can control a building's internal temperature, and generating multiple lithographic patterns with a single mask.

Abstract: Ion implantation apparatus has an implant wheel in a vacuum chamber. The implant wheel has a number of circumferentially distributed wafer holding positions and is arranged to spin so that the wafers successively intercept an ion beam. The implant wheel is mounted at the free end of a scanning arm which itself is mounted for reciprocating movement on a wall of the vacuum chamber by means of a rotary vacuum seal. A wheel drive motor is mounted in the vacuum chamber on the rotational axis of the implant wheel and the wheel and drive motor combination can be tilted at the end of the scanning arm to adjust the angle of implantation. The tilt actuator is inside the vacuum chamber mounted on the scanning arm and the tilt axis is such that the axis of rotation of the implant wheel remains always in the same plane as the axis of scan of the scanning arm.

Abstract: Apparatus for feeding banding tape (22) from a tape spool mounted in a tray (27) to a station where a stack is wrapped by the tape, comprises a tape feeder (30) including a feed head (29) terminating in a tape guide (32, 33) which is movable between a first position (30) spaced from the stack and a second position (30') in which the tape guide is adjacent the stack. The tape path length from tape pinch means (28, upstream of the feed head) to the stack is longer for the first feed head position than for the second feed head position (30'). The tape end is clamped next to the stack with the tape feed head in its second position; the feed head is then withdrawn to its first position prior to rotation of the stack to form the band. A tape cutter then cuts the tape downstream of the feed head, and the feed head is thereafter moved to its second position, the tape being pulled back through the feed head until the cut end is flush with the end of the tape guide against the stack.