A sensitive, selective and rapid method for the analysis of organophosphorus flame retardants (OPFRs) and ultraviolet absorbers (UVAs) in river water and STP effluent samples by solid-phase extraction (SPE) with ultra-performance liquid chromatography tandem mass spectrometry (UPLCMS/MS) was developed. It allows the determination of 8 OPFRs and 6 UVAs. A single SPE consisting on the loading 200...

We have conducted a systematic survey for intervening OVI absorbers in available echelle spectra of 16 QSOs at zQSO = 0.17 − 0.57. These spectra were obtained using HST/STIS with the E140M grating. Our search uncovered a total of 27 foreground O VI absorbers with rest-frame absorption equivalent width Wr(1031) & 25 mÅ. Ten of these QSOs exhibit strong OVI absorbers in their vicinity. Our OVI su...

We are involved in a program to derive properties of broad absorption line (BAL) winds in quasars using combined UV and X-ray observations. A major obstacle is large uncertainties in the derived BAL column densities because of partial coverage of the background light source. In this preliminary report, we circumnavigate those uncertainties by making a simple assumption – that the relative metal...

We present a model for the Lyman-α absorbers that treats all objects (from the low-density forest clouds to the dense damped systems) in a unified description. This approach is consistent with an earlier model of galaxies (luminosity function, metallicity) but also with the known description of the density field in the small-scale non-linear regime. We consider two cosmological models: a critic...

Clear coats have been a staple in automobile paints for almost thirty years and are of forensic interest when comparing transferred and native paints. However, the ultraviolet (UV) absorbers in these paint layers are not typically characterized using UV microspectrophotometry, nor are the results studied using multivariate statistical methods. In this study, measurements were carried out by UV ...

We present the first grating-resolution X-ray spectra of the Seyfert 1 galaxy NGC 3783, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-Ray Observatory. These spectra reveal many narrow absorption lines from the H-like and He-like ions of O, Ne, Mg, Si, S, and Ar as well as Fe xvii-Fe xxi L-shell lines. We have also identified several weak emission lines, mainly...

We present the first grating-resolution X-ray spectra of the Seyfert 1 galaxy NGC 3783, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-ray Observatory. These spectra reveal many narrow absorption lines from the H-like and He-like ions of O, Ne, Mg, Si, S and Ar, as well as Fe XVII–Fe XXI L-shell lines. We have also identified several weak emission lines, mainly...

Epoxy coatings are used in a wide variety of applications due to their excellent chemical, thermal, and mechanical properties. However, susceptibility UV degradation has limited use exterior applications. Usually, organic absorbers stabilizers added epoxy systems improve stability, but performance decreases over time the loss UV-stabilizers. In this study, novel method was developed encapsulate...

Ca ii λλ3934, 3969 absorbers, which are likely to be a subset of damped Lyman α systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(B−V) than other absorption systems. There is also evidence that Ca ii absorbers trace galaxies with more ongoing star-formation than the average quasar absorber. Despite this, relatively little is known in detail abou...

Novel pollutant control equipment, which were called integrated pollutant control equipment, consisted of bag filters and activated carbon (AC) absorbers. The AC absorbers were put forward to absorb the additional pollutants between the old and new emission standards to satisfy Chinese emission standards. The absorbers could be fixed (mobile) bed, annular column, or fluidized bed. The numerical...