Norm and Essential Norm of Composition Followed by Differentiation from Logarithmic Bloch Spaces to H

In this note we express the norm of composition followed by differentiation DCφ from the logarithmic Bloch and the little logarithmic Bloch spaces to the weighted space Hμ∞ on the unit disk and give an upper and a lower bound for the essential norm of this operator from the logarithmic Bloch space to Hμ∞