DSC is a thermal analysis technique for recording the heat necessary to establish a zero temperature difference between a substance and a reference material, which are subjected to identical temperature programs in an environment heated or cooled at a controlled rate [42]. The recorded heat flow gives a measure of the amount of energy absorbed or evolved in a particular physical or chemical transformation. The concept behind the electrical resistance technique is totally different from that of DSC. This technique involves measuring the DC electrical resistance when the polymer has been reinforced with electrically conducting fibers such as continuous car-bon fibers. The resistance is in the fiber direction. The polymer molecular movements that occur at the glass transition and melting disturb the carbon fibers, which are much more conducting than the polymer matrix, and thus affect the electrical resistance of the composite in the fiber direction, thereby allowing the resistance change to indicate the glass transition and melting behavior.