Results 251 to 260 of about 10,056,652 (288)

Formation of Emission Lines

2007
When we consider the radiation fields of stellar envelopes exposed to the photospheric UV radiation, the basic feature is their anisotropic nature. The degree of anisotropy is expressed by the geometrical dilution factor, W, defined as the ratio of the solid angle, ω, of the photosphere seen from a point of interest, P, relative to the total solid ...
Tomokazu Kogure, Kam-Ching Leung
openaire   +1 more source

Spectral Line Formation

2012
This chapter gives a review of spectral line formation processes, starting with the main equations valid in thermodynamic equilibrium. The Einstein coefficients and the main spectral line profile functions are discussed.
openaire   +1 more source

Group Formation on a Line

Symposium i Anvendt Statistik, 2010
Artiklen viser at en nummerering af indsamlede evalueringsskemaer kan afsløre gruppedannelse blandt de tilhørende studenter på et stort undervisningshold.Gruppedannelsen viser sig ved at sequenser med ens bedømmelse afviger fra en tilfældig fordeling defineret som en negativ binomialfordeling, der løber indtil to "succeer" er opnået.
openaire   +2 more sources

Line formation in magnetic fields

Solar Physics, 1970
Hyder (1968) has suggested that longitudinal magnetograph measurements of weak magnetic fields in prominences have underestimated field strengths as the result of zero-field levelcrossing interference (the Hanle effect). Hyder (1968) also suggested that resonance polarization effects have sometimes led to errors in measurements of the transverse ...
openaire   +1 more source

THE MECHANICS OF INSTABILITY-LINE FORMATION

Journal of Meteorology, 1959
Abstract It is proposed that under certain conditions of wind flow that temperature changes due to horizontal advection and vertical motion produce a trend towards the formation within a few hours of a line or narrow band of vertical thermal instability associated with a marked increase in low-level convergence along the same line or narrow band.
openaire   +1 more source

Formation of FEII Lines in AGN

1988
Up to now photoionization models of the Broad Line Region of quasars fail to explain the strength of low ionization lines, in particular, FeII lines are too weak compared to H3. Using a code mainly designed to study low ionized and optically thick medium, I have calculated the radiation transfer in a non-photoionized homogeneous cloud in order to ...
openaire   +1 more source

Fine Line Conductor Formation

Circuit World, 1992
Driven by the demand for higher density in electronic packaging, each signal plane of printed wiring board must accommodate more conductors. As a result, conductor width is becoming narrower each year. This chapter reviews some of the important steps of forming finer line conductors in printed wiring boards, such as surface preparation, plating/etching,
openaire   +1 more source

The Formation of FeII Emission Lines

1988
The excitation of FeII emission lines is reviewed, with special emphasis on photoionized nebulae. The physical conditions, the geometry and the techniques required to calculate FeII models are explained and the following mechanisms discussed: a: Excitation by absorption of continuum radiation. b: Excitation by inelastic collisions, and c: Excitation by
openaire   +1 more source

Computational study of nozzle spray-line distribution effects on stratified mixture formation, combustion and emissions of a high compression ratio DISI methanol engine under lean-burn condition

Energy, 2020
Yulin Chen, Jingzhen Sun, Changming Gong
exaly  

Non-LTE formation of the Fe I 6173 Å line in the solar atmosphere

Astronomy and Astrophysics, 2023
Sami Solanki, Smitha Narayanamurthy, M van Noort   +2 more
exaly