The adsorption of polyacrylic acid (PAA) on hydroxyapatite (HAP) from HAP saturated solutions was studied in this work as a function of PAA concentration, temperature, pH and ionic strength. In all experiments, the adsorption was studied under conditions of negatively charged adsorbent and adsorbate, respectively. These conditions ensured that adsorption was not electrostatically favored. The s...

Heterogeneous Fe-Mn/sepiolite catalysts were prepared by the coprecipitation method, followed by heat treatment. The catalysts were characterized by several techniques; analysis by X-ray fluorescence (XRF) and scanning electron microscopy (SEM) confirmed the existence of fine Fe and Mn particles in the catalysts. Compared to natural sepiolite, the specific surface area of the Fe-Mn/sepiolite ca...

We examine the contributions of odd-parity nuclear operators to the two-neutrino double beta decay 0 → 0 amplitude, which come from the P -wave Coulomb corrections to the electron wave functions and the recoil corrections to the nuclear currents. Although they are formally of higher order in αZ/2 or v/c of the nucleon than the usual Fermi and GamowTeller matrix elements, explicit calculations p...

We present a density functional theory (DFT) calculation in the generalized gradient approximation to study the possibility for the existence of Jahn-Teller (JT) or pseudo Jahn-Teller (PJT) type local distortions in the La-Ba-Cu-O superconducting system. The analysis is based on the calculation and correspondingly group theory classification of the electronic ground state of the CuO6 −10 elonga...

The purpose of this research is to provide a deeper understanding of the planar high- symmetry configuration instability. In the ideal case, the distortion corresponds to the movements of nuclei along normal modes that belong to non-totally symmetric irreps of the high symmertry (HS) point group of molecule. The analysis of the structural distortion from the HS nuclear arrangements of the JT ac...

X iv :h ep -t h/ 94 09 09 7v 1 1 7 Se p 19 94 CALT-68-1949, USC-94-015 hep-th/9409097 September 1994 On the non-relativistic limit of the quantum sine-Gordon model with integrable boundary condition. A. Kapustin, S. Skorik † Physics Department, California Institute of Technology, Pasadena, CA 91125. ‡ Physics Department, University of Southern California, Los Angeles, CA 90089-0484. Abstract We...

2014 The Zeeman effect has been used to analyse the fine structure of the lowest 4T2 level of Mn2+ in ZnS. We have measured the Zeeman splittings and the relative intensities for different polarizations in a 100 kG superconducting magnet. In order to interpret the experimental spectra, a cluster model is assumed and Ham effects are considered. A medium Jahn-Teller coupling with an E vibrational...