Pyroxene spectroscopy has been the focus of much research since the 1970’s [e.g. 1,2-4]. Most of this research has centered on the behavior of the prominent 1 and 2 μm crystal field (CF) absorptions that easily distinguish pyroxene from other minerals [1,5]. In addition to these absorption bands, there are a number of spin-forbidden crystal field absorptions in visible spectra of Fe-bearing pyr...

The LINER galaxy NGC 2639 contains a water vapor megamaser, suggesting the presence of an edge-on nuclear accretion disk or torus. This galaxy is thus a good candidate for revealing absorption by the torus of any compact nuclear continuum emission. In this paper, we report VLBA radio maps at three frequencies and an ASCA X-ray spectrum obtained to search for free-free and photoelectric absorpti...

Although the existence of large-scale hot gaseous halos around massive disk galaxies have been theorized for a long time, there is yet very little observational evidence. We report the Chandra and XMM-Newton grating spectral detection of O VII and Ne IX Kα absorption lines along the sight-line of 4U 1957+11. The line absorption is consistent with the interstellar medium in origin. Attributing t...

The oral bioavailabilities of phenolic acids in Flos Lonicerae Japonicae beverage were low. The observation from an in vitro Caco-2 cell model showed that the absorptions of phenolic acids were mainly permeated via paracellular diffusion, and influenced by P-glycoprotein (P-gp), multidrug resistance-associated protein 2 (MRP2) and breast cancer resistance protein (BCRP). Besides, the Papp (AP→B...

The structures of phosphated titania and sulphated titania are studied with a combined approach using DFT/B3LYP/Lanl2DZ and experimental studies such as XRD, XPS, and DRIFT spectra. The infrared absorptions, Mulliken charges, bond lengths, and dipole moments are investigated for the phosphated and sulphated titania structures optimized by DFT calculations. The XRD patterns obtained for both the...

Collapsed titania nanotubes (cTiNT) were synthesized by the calcination of titania nanotubes (TiNT) at 650 °C, which leads to a collapse of their tubular morphology, a substantial reduction in surface area, and a partial transformation of anatase to the rutile phase. There are no significant changes in the position of the XPS responses for Ti and O on oxidation or reduction of the cTiNTs, but t...