black brick
3.A black or blackish-red to brick-red mineral, essentially Fe2O3, the chief ore of iron.
4.The entropies of quantum fields on event horizon of a toroidal black hole are given using the improved brick-wall model.
5.These calculation and discussion imply that the high density quantum states near the event horizon are strongly correlated with the quantum states in black hole and the ultraviolet cut-off in the brick-wall model is not reasonable.
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9.By using the improved brick-wall model in this paper we obtain the statistical entropy of the Dirac field 
of Reissner-Nordstr? m black holes.
of Reissner-Nordstr? m black holes. 10.Using the thin film brick-wall model and WKB approximation,the entropy of the scalar quanti-ty field in the non-stationary and slowly changing Reissner-Nordstr m(R-N)black hole is calculated.
