منابع مشابه
Line Emission from
We have studied the molecular and ne structure line emission from dense photodissociation regions (PDRs). In particular, we have concentrated on predicting the line emission from CO and H2 molecules. We nd that, when the gas density is su ciently high relative to the FUV ux (n=G0 102 cm 3), self-shielding of the molecules can move the C+/CO and H/H2 atomic-molecular transitions close to the sur...
متن کاملLine source emission modelling
Line source emission modelling is an important tool in control and management of vehicular exhaust emissions (VEEs) in urban environment. The US Environmental Protection Agency and many other research institutes have developed a number of line source models (LSMs) to describe temporal and spatial distribution of VEEs on roadways. Most of these models are either deterministic and/or statistical ...
متن کاملEMISSION-LINE OBJECTS FROM A PRELIMINARY UKST OBJECTIVE PRISM SURVEY
A visual search has been made of four fields using United Kingdom 1.2m Schmidt Objective Prism plates with a reciprocal dispersion of 1 180 A/mm at HP. Such plate material is ideally suited to searches for emission-line galaxies. We present a catalogue of 53 emission-line objects, which comprises 45 galaxies, where individual HI1 regions are resolved in 16 bright galaxies; 8 are emission li...
متن کاملDislocation emission from sharp and blunt cracks in f.c.c. metals
We use computer simulations to study the behavior of sharp and blunted cracks in various f.c.c. metals. We find that in models representing platinum and gold a sharp crack is stable with respect to the emission of a dislocation from the crack tip, whereas for all other metals studied the sharp crack is unstable. This result cannot be explained by existing criteria for the intrinsic ductile/brit...
متن کاملThe Weak Emission Line Stars
In this paper, we study the evolution of the weak emission line central stars of planetary nebula (WELS), which are similar to the H-deficient Wolf-Rayet central stars except for systematically weaker emission lines. Our attempts at finding an evolutionary sequence for the WELS similar to what was established for Wolf-Rayet central stars, were unsuccessful. No correlation was found between any ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1995
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.52.177