In a disclosed embodiment, a \u201cvoice noise power\u201d is added to an aggregate voice power which is the total voice power used by all users in a cell. The cabinet-like base and the surface are configured to cooperate functionally with a function of the object. The etching process employs various etching steps that selectively remove various layers of the magnetic thin film structure stopping on the antiferromagnetic layer or the Ru spacer. A methanol concentration sensor is positioned to communicate with the fuel cell membrane electrode assembly and the fuel-supply channel for regulating the mixture of fuel to the electrode assembly. The second partition has a rectangle-shaped or fan-shaped honeycomb configuration.