We obtained far-ultraviolet spectra of the Seyfert 1 galaxy NGC 7469 using the Far Ultraviolet Spectroscopic Explorer on 1999 December 6. Our spectra cover the wavelength range 990–1187 Å with a resolution of ∼ 0.05 Å. We see broad emission lines of C III, N III, O VI, and He II as well as intrinsic absorption lines in the O VI λλ1032, 1038 resonance doublet. The absorption arises in two distin...

a column of alumina modified with sodium dodecyl sulfate (sds) and dimethylglyoxime (dmg) was prepared for the preconcentration of trace nickel from water samples for flame atomic absorption spectrometry (faas) determinations. under optimized conditions (ph=7.0; flow rate: 20 mlmin-1) nickel was retained on the column. the nickel collected on the column was eluted with 5 ml of 1 m nitric acid. ...

Mononethanolamine (MEA)-based absorption-stripping for CO2 capture is studied. Energy demands in this process are dominated by the stripping column. The shortest stripping line distance approach is used to determine minimum energy requirements for the MEA stripping column under various lean loadings. Simultaneous reaction and vapor-liquid equilibrium is assumed and modeled by the direct incorpo...

We compare the H I column densities from Lyα absorption to the metal column densities from soft X-ray absorption in gamma-ray burst (GRB) afterglows. Of the eight bursts for which useful measures are obtained we find a range in metallicities from sub-solar to a few hundred times the solar value. The lack of correlation in the column densities, and the large range and extreme values of these ‘me...

We compare the H I column densities from Lyα absorption to the metal column densities from X-ray absorption in γ-ray burst (GRB) afterglows. Eight bursts of seventeen entering the sample, have significant extragalactic X-ray absorptions. Of these we find a range in metallicities from sub-solar to a few hundred times the solar value. There is a complete lack of correlation between the X-ray and ...

We compare the H I column densities from Lyα absorption to the metal column densities from soft X-ray absorption in gamma-ray burst (GRB) afterglows. Of the eight bursts for which useful measures are obtained we find a range in metallicities from sub-solar to a few hundred times the solar value. The lack of correlation in the column densities, and the large range and extreme values of these ‘me...

We report on a lidar approach to measure atmospheric CO2 column concentration being developed as a candidate for NASA’s ASCENDS mission. It uses a pulsed dual-wavelength lidar measurement based on the integrated path differential absorption (IPDA) technique. We demonstrated the approach using the CO2 measurement from aircraft in July and August 2009 over various locations. The results show clea...