A barrier layer material and method of forming the same is disclosed. The heat exchangers use a non-scaling common liquid heat transfer medium. A compensation relationship of the spectral characteristic, the parameter and a compensated physiological measurement is determined. In one example, the thermal sink includes a plurality of thermal sinks operatively coupled to the conductive shelf. Security is also provided by maintaining security information received from the server for files that are in the cache, and using that security information to determine access to the file when offline. In particular, embodiments of this invention analyze monitoring data from other application nodes in a distributed computing system to determine whether the component failure is genuine.