Compositions including carbon nanofoam are suitable for printing and magnetic ink. The diode also includes an ohmic electrode provided on the second layer and a Schottky electrode provided on the second layer. The anode includes a p+-type diffusion region, a p\u2212-type region, and an anode electrode. Each radial arm includes at least one flexible wiper in a closed position, and one orifice corresponding to each of the at least one flexible wipers. A hard coat film obtained by coating a plastic substrate with the coating composition, followed by thermo-curing, exhibits high transparency and hardness, and has excellent anti-scratch and chemical-resistant properties. 0%; optionally annealing the hot-rolled steel sheet; performing cold rolling once, or twice or more with intermediate annealing therebetween; performing primary recrystallization annealing in a low- or non-oxidizative atmosphere and adjusting the C content in the steel sheet after primary recrystallization annealing to be held in the range of about 0.