A geosynthetic tufted drain barrier for preventing vertical migration of fluids. The exemplary illustrative non-limiting implementation provides a bleed leakage detection system with continuous monitoring of thermostat sensor wiring during flight and thermostat self-test function. The coat film includes at least one titanium carbonitride layer. The walls define a generally rectangular enclosure having open sides communicating with an interior space. The light-emitting layer has a stacked-layer structure including a first light-emitting layer and a second light-emitting layer, and the first light-emitting layer contains a higher proportion of the second organic compound than the second light-emitting layer. The method and system calculates a Fast Fourier Transform output for one or more upper and lower frequency side null subcarriers and center data subcarriers of a frequency channel.