Heavily obscured active galactic nuclei (AGNs) are known to show deep silicate absorption features in the mid-infrared (IR) wavelength range of 10--20~$\mu$m. The detailed profiles reflect properties dust, which likely include information on AGN activities by large amounts dust. In order reveal we select 115 mid-IR spectra heavily AGNs observed Spitzer/IRS, and systematically analyze compositio...

Several investigations have demonstrated that olivine may be used to simulate geochemical and cosmochemical reactions. Since in extra-terrestrial samples has varying forsterite numbers natural contains inevitable impurities, synthetic with the requisite number been prepared for various experimental research. This study aimed synthesize Fe-bearing via experiments conducted at near-solidus temper...

— Two ionic conductors : yttria stabilized zirconia and nonstoichiometric forsterite were studied by an impedance complex method. For both materials, this technique allows us to separate, on each side of a caracteristic frequency wc, two domains corresponding to different relaxation mechanisms. The frequency a>c has been identified as the jump frequency of the charge carriers. The frequency dep...

Abstract It is not known if the thermodynamic behavior of some minerals and their synthetic analogues are quantitatively same. Olivine an important rock-forming substitutional solid solution consisting two end-members forsterite, Mg2SiO4, fayalite, Fe2SiO4. We undertook first heat capacity, CP, measurements on natural olivines between 2 300 K; nearly end-member fayalite a forsterite-rich crysta...