A study is presented of the optical thickness of spectral lines of carbon, nitrogen and oxygen ions in the quiet sun. The observations consist of cross limb scans by the SUMER and CDS spectrometers on the SOHO spacecraft. A maximum likelihood spectral line fitting code has been adapted to analyse the multiplet profiles and to provide an assessment of errors in the count rates, especially of clo...

The widths of spectral lines in the ultraviolet (UV) and extreme ultraviolet (EUV) spectral regions that are formed in the solar transition region and corona are usually greater than the optically thin widths due to thermal Doppler broadening calculated under the assumption of ionization equilibrium. Although opacity can explain the widths of some lines, there are a host of optically thin lines...

Tomographic imaging of minor species in combustion exhaust is an important requirement for combustion engineering. Only one group has tried carbon monoxide imaging in laminar flames in the mid-infrared region. A number of attempts have been made by different groups for single-channel multi-pass or long path-length measurement of CO. Singlepass measurement is being assessed in our work for tomog...

In this paper we use the pseudofermion dynamical theory (PDT) in the study of the one-electron removal singular spectral features the one-dimensional Hubbard model. The PDT reveals that in the whole (k, ω)-plane such features are of power-law type and correspond to well defined lines of three types: the charge singular branch lines, the spin singular branch lines, and the border lines. One of o...

A three-dimensional picture of the solar atmosphere's thermodynamics can be obtained by jointly analyzing multiple spectral lines that span many formation heights. In Paper I, we found strong correlations between shapes from a variety different ions during flares in comparison to quiet Sun. We extend these techniques address following questions: which regions atmosphere are most connected flare...

Time Hopping (TH) is commonly used for Ultra Wideband Impulse Radio (UWB-IR) systems as a multiple access scheme. Such system suffers from the existence of spectral lines, which in turn require a power back-off of the total signal. Recently, Pulse-based polarity randomization for UWB IR system was proposed. The use of polarity codes can provide additional robustness against the Multiple Access ...

We present an easy-to-use formula for mean (spaceand direction-average) specific intensity of radiation in uniform spherical and cylindrical plasmas, which are not under external irradiation. This formula has high accuracy in any spectral interval dn taken in continuum as well as within a spectral line of any profile, including overlapping lines and lines on a pedestal of intense continuum in a...