A method of separating at least part of one or more components from a mixture of components includes exposing the mixture to a porous barrier, the barrier being formed of a material structure having, or behaving in the manner associated with, a negative Poisson ratio. The card-like portable article further comprises an interface for converting commands in accordance with the first communication protocol into commands in accordance with a second communication protocol and vice versa. When the cellular phones receive an e-mail with an attached photograph, they display the mail text overlaid over the image as a background image. A test bench CSts is selected that couples RTLMts and HLMts. The mobile terminal then scans for the identified WLAN.