Real space renormalization of a mixed valence hamiltonian on a bethe lattice

A mixed valence system may be described by two hybridized bands: a narrow one with strong Coulomb interaction and a conduction band. We study this model by means of a decimation method originally developed for a linear chain and recently extended to a Bethe lattice. Different values of the hybridization are compared. The densities of states so obtained exhibit a more detailed structure than equivalent CPA calculations.     

Isolation and structural elucidation of a novel rotenoid from the seeds of Clitoria fairchildiana

The seeds of Clitoria fairchildiana provided a new rotenoid, 6-hydroxy-2,3,9-trimethoxy-[1]benzopyrano[3,4-b][1]benzopyran-12(6H)-one. The structural elucidation was performed using detailed analyses of H- and 13C-NMR spectra including 2DNMR spectroscopic techniques (1H-13CHETCOR) and by comparison with spectrometric data from the literature. The anti-inflammatory activity was investigated using a capillary permeability assay.     

Quasi-Norm interpolation error estimates for the piecewise linear finite element approximation of p-Laplacian problems

Summary. In this work, new interpolation error estimates have been derived for some well-known interpolators in the quasi-norms. The estimates are found to be essential to obtain the optimal a priori error bounds under the weakened regularity conditions for the piecewise linear finite element approximation of a class of degenerate equations. In particular, by using these estimates, we can close the existing gap between the regularity required for deriving the optimal error bounds and the regularity achievable for the smooth data for the 2-d and 3-d p-Laplacian.Mathematics Subject Classification (1991): 65N30     

Effect of the d-f coulomb correlation on the valence transition of intermediate valence systems

The d-f Coulomb repulsion, G, is treated by means of a real space decimation procedure on a Bethe lattice. The valence is calculated as a function of the relative position of the f-level with respect to the conduction band. No discontinuous transitions are found.     

Effect of the d-f correlation on the electronic structure of intermediate valence systems

The electronic structure of an intermediate valence system is calculated by means of a real space renormalization technique on a Bethe lattice. The d-f Coulomb repulsion G is treated into the alloy analogy approximation. The valence and the densities of states are calculated as a function of G. We find that the hybridization gap decreases when G increases, and that the density of states at the Fermi level exhibits a peak as a function of G.