| http://www.w3.org/ns/prov#value | - Therefore, to increase the specific surface area without limitation is not preferable. [0050] The inventors etc. inferred, for the fact that there is a case where the light-to-heat conversion efficiency is degraded as the specific surface area is further increased as mentioned above, as follows: [0051]FIG. 3 shows the rate of surface existence of the above-mentioned infrared light absorbent near t
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