A test plug for a shower drain includes a threaded portion having external threads sized to be received in an threaded aperture of a drain. The method further includes identifying a selected one of a plurality of network nodes to facilitate the communication session. A cartridge having a network of conduits and reservoirs contains several of such paddle wheels to transport blood and reagents. DV is a volume mean particle diameter. The thermally protective layer is configured to limit temperature fluctuations at the inner surface of the base tube to less than approximately 20 degrees Celsius during operation of the pulse detonation system, and the thermally protective layer does not comprise a ceramic coating. In another form, a method of forming a semiconductor device is disclosed that includes: providing a substrate; forming a first high-k dielectric layer above the substrate; forming a second dielectric layer of a different high-k material above the first dielectric layer; and forming a gate structure above the second dielectric layer.