The measurement of absorption over short distances in the local interstellar medium (LISM) provides an excellent opportunity to study the properties of O VI absorption and its kinematic relationship to absorption by tracers of cool and warm gas. We report on the properties of LISM O VI absorption observed with 20 km s −1 resolution Far Ultraviolet Spectroscopic Explorer (FUSE) observations of 3...

The research work on the unsteady state behavior of gas absorption column for CO2-NaOH system was carried out using the armfield gas absorption column. A model equation was developed by considering material balance around the system. The concentrations of the inlet and outlet liquid streams and the gas outlet stream varied as functions of time, while all other parameters, gas inlet stream conce...

We searched for 21-cm absorption associated with the zabs= 1.3647 absorption system toward the gigahertz peaked-spectrum source PKS 0237−233 using the Giant Metrewave Radio Telescope. A high quality UVES spectrum shows that C i and C i are detected at this redshift together with C ii, Mg i, Mg ii, Si ii, Al ii, Fe ii and Mn ii. The complex profiles, spread over ∼ 300 km s, are fitted with 21 Vo...

We present results from two projects in which we have used the HI 21cm emission line as a tracer of gas-rich galaxy populations in the vicinity of Lyman-α absorbers. In the first case, we examine the HI environment of SBS 1543+593, the nearest damped Lyman-α absorber. We use a VLA map of the region around this LSB galaxy which itself shows an extended HI disk to identify 3 gas rich neighbors wi...

A soft ultraviolet radiation field, 10.2 eV< hν < 13.6 eV, that permeates neutral intergalactic gas during the Epoch of Reionization (EoR) excites the 2p (directly) and 2s (indirectly) states of atomic hydrogen. Because the 2s state is metastable, the lifetime of atoms in this level is relatively long, which may cause the 2s state to be overpopulated relative to the 2p state. It has recently be...

Cerebral gas embolism is a serious consequence of diving. It is associated with decompression sickness and is assumed to cause severe neurological dysfunction. A mathematical model previously developed to calculate embolism absorption time based on in vivo bubble geometry is used in which various conditions of hyperbaric therapy are considered. Effects of varying external pressure and inert gas...

We present a detailed study of the H i 21cm absorption system at z = 0.0912 towards the radio quasar B0738+313. The uncommonly narrow main absorption line and weak secondary line are resolved for the first time and have FWHM velocities of ∆v 1 = 3.7 and ∆v 2 = 2.2 km s −1 (main and secondary component respectively). In addition we find it necessary to add a third, broader shallow component to o...

Recent numerical simulations show that many Lyα absorption lines of column densities NHI < ∼ 10 15 cm are produced in transient, mini pancakes. Such pancakes are modeled here, approximating the initial perturbation leading to the formation of the pancake as a single sinusoidal wave. The density and temperature profiles of the gas in the pancake are determined in the case where cooling and heati...

We have searched for interstellar or circumstellar absorption lines in the center of Ca II K towards bright A-type stars that are mostly within 80 pc of the Sun. Narrow absorption features are found in about 30 % of the 28 normal main-sequence A stars and 18 metal-deficient λ Bootis stars studied. We have determined surface gravities and projected rotational velocities. Most of the stars with d...

BACKGROUND New gas therapies using inert gases such as xenon and argon are being studied, which would require chronically administered repeating doses. The pharmacokinetics of this type of administration has not been addressed in the literature. METHODS A physiologically based pharmacokinetics (PBPK) model for humans, pigs, mice, and rats has been developed to investigate the unique aspects o...