A hopper assembly for feeding granular material, such as pharmaceutical powder, includes a hopper having an upper inlet and a lower outlet defining a substantially vertical center axis, and a flow controllerenhancer disposed in the hopper adjacent the outlet. The system also includes an actuator mechanism that is configured to position transducing heads and at least one filter disposed between two discs to filter airflow. The hinge includes a fixing portion coupled with the cover of the main body. A method can fabricate such DRAM devices. The heat-dissipation device includes a heat-acquisition element configured to absorb heat from a portion of a live transmission line of the power transmission system.