An arrangement for a non-hermetic seal between a stator and a rotor of a turbomachine in the root region of guide blades belonging to the stator. The power supply apparatus provides a compact and lightweight power generator system, thus eliminating cumbersome operations such as replacement or recharging of a large battery. The abrasive extending laterally outwardly from the surface of the saw blade and providing a finishing effect on the work piece as the abrasive widens the cut beyond the cut of the saw blade teeth. The thermal interface material improves performance of an integrated circuit. The asymmetry of the trench ensures that the trench isolation region has a relatively narrow width and, thereby ensures that both collector-to-base capacitance Ccb and collector resistance Rc are minimized within the resulting bipolar semiconductor device.