A method and system for measuring heat energy of a combustible fluid in which light having wavelengths in the near-infrared is directed into a test cell containing the combustible fluid and portions of the light not absorbed by the combustible fluid and passing out of the cell are spatially dispersed by wavelength, forming a light spectrum that is projected onto a detector. Articles that can be made from the sulfonated aromatic copolyesters include films, coatings and laminates. The portion of erosion resistant material and the vibration damping coating are adhesively bonded to the compressor blade such that the vibration damping coating is arranged between the surface of the compressor blade and the portion of erosion resistant material. When the command pattern for the same shape is completed, and a learning control end command is output, whereupon the switch is turned off and learning control terminates. Upon one-pot base-induced ring-closure and desulfonation of the formed 2. A quality determination processing unit issues an alarm when the quality level of the master clock signal is deteriorated beyond a threshold provided by a synchronization management table.