A transverse flow adjustable pressure regulator controls the flow of a gas from a high pressure source to a low pressure device. Each antenna element has a pair of arms which together define a dipole axis, and the dipole axis is tilted at an acute angle with respect to the reflective surface. The p-type dopant causes formation of vacancies of atoms of the group II element in the semiconductor material. When the canister is engaged with the docking station, the canister is capable of fluid communication with a gas cell via the valve. The apparatus also has at least one sealing mechanism located at a distal end of the at least one outlet conduit for preventing metal vapor and carrier gas from exiting the outlet conduit during heating of the outlet conduit. In one embodiment, the gateway performs translation between access network protocol signaling and gateway control protocol messaging such that, to the call agent, the gateway appears to be physically connected to a group of subscribers directly, and to the access network, the gateway appears to function as a circuit-switched network.