Abstract: A portable checkpoint system is disclosed that incorporates a configurable freight container to facilitate transport and conversion for operation. The container is disposable into closed and open configurations. The closed configuration enables the container to be transported. The open configuration enables a vehicle to drive therethrough. In the closed configuration, the container forms a quadrilateral set of walls connectable in a rectangular box. A hinge joins two adjacent walls along a pivotable edge and pivots between perpendicular and coplanar positions corresponding respectively to the closed and open configurations. A joint reversibly connects two walls opposite the adjacent walls along a separable edge, disconnecting from a lock position to an unlock position that correspond respectively to the closed and open configurations. The hinge's perpendicular position disposes the two adjacent walls to be mutually perpendicular at the pivotable edge and forms the rectangular box.

Abstract: Carbon nanotube apparatus, and methods of carbon nanotube modification, include carbon nanotubes having locally modified properties with the positioning of the modifications being controlled. More specifically, the positioning of nanotubes on a substrate with a deposited substance, and partially vaporizing part of the deposited substance etches the nanotubes. The modifications of the carbon nanotubes determine the electrical properties of the apparatus and applications such as a transistor or Shockley diode. Other applications of the above mentioned apparatus include a nanolaboratory that assists in study of merged quantum states between nanosystems and a macroscopic host system.