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The maximum entropy method (MEM) can be used to determine the electron density in the unit cell of periodic crystals from phased x-ray diffraction data. As a straightforward extension of this method, the MEM formalism can be applied to the generalized electron density in the unit cell of superspace describing the structures of aperiodic crystals. The principles of the MEM are discussed as they need to be modified for the application of the MEM to generalised electron densities in (3 + d)-dimensional superspace (d is an integer). A critical discussion is given of the potential of the MEM for the determination of modulation functions of incommensurately modulated crystals and composite crystals as well as for the determination of atomic occupation domains of quasicrystals.

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Redox behavior of thin films of polybithiophene deposited on substrates of conducting glass and single-or multi-walled carbon nanotubes is studied at positive potentials in a 0.1 M (C 4 H 9 ) 4 NBF 4 solution in acetonitrile. The polymer's formal doping-undoping potentials are nearly the same for all substrates, which points to the absence of any marked donor-acceptor interaction between nanotubes and polybithiophene. Some polybithiophene electrochemical characteristics (reversibility, doping degree) are improved when deposited onto nanotubes, probably due to the developed surface of the electrode based on carbon nanotubes.