Results 11 to 20 of about 6,084,559 (245)
Dirac R-matrix collision strengths and effective collision strengths for transitions of Ni xvii [PDF]
Astronomy & Astrophysics, 2011 Context. Electron impact excitation collision strengths are required for the analysis and interpretation of stellar observations. Aims. This calculation aims to provide fine structure effective collision strengths for the Nixvii ion using a method which includes contributions from resonances. Methods.
C. E. Hudson +3 more
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Effective collision strengths for transitions in Fe XV [PDF]
Astronomy & Astrophysics, 2003 Collision strengths for transitions among the energetically lowest 53 fine-structure levels belonging to the (1s(2)2s(2)2p(6)) 3l(2), 3l3l', 3s4l and 3p4s configurations of Fe XV are computed, over an electron energy range below 160 Ryd, using the Dirac Atomic R-matrix Code (DARC) of Norrington & Grant (2003).
Keenan, Francis +2 more
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Effective collision strengths for transitions in Ni XIX [PDF]
Astronomy & Astrophysics, 2008 Aims. In this paper we report electron impact collision strengths and excitation rates for transitions among the lowest 89 levels of Ni xix. Methods. The Dirac atomic R -matrix code (darc) is adopted for the calculations of collision strengths and subsequently the effective collision strengths. Results. Collision strengths for resonance transitions
Aggarwal, K. M., Keenan, F. P.
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Effective collision strengths for allowed transitions among the n [PDF]
, 2008 Aims.In this paper we report on calculations of collision strengths and effective collision strengths for allowed transitions among the $n \le$ 5 degenerate levels of Al XIII.Methods.The Dirac atomic R-matrix code (DARC) has been adopted for these calculations.Results.Collision strengths are reported over a wide energy range below 300 Ryd, and ...
Aggarwal, K. M. +3 more
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Oscillator strengths and effective collision strengths for electron excitation of Mg VI [PDF]
Astronomy & Astrophysics, 2012 Aims. Electron impact excitation collision strengths and oscillator strengths for the astrophysically important lines in Mg VI are reported. Thermally averaged collision strengths are presented as a function of electron temperature for application to solar and other astrophysical plasmas.Methods.
S. S. Tayal
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Electron-impact excitation of Sc ii: collision strengths and effective collision strengths for fine-structure transitions [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 Accurate fine-structure atomic data for the Fe-peak elements are essential for interpreting astronomical spectra. There is a severe paucity of data available for Sc II, highlighted by the fact that no collision strengths are readily available for this ...
M. F. R. Grieve, C. A. Ramsbottom
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A new method for deducing the effective collision frequency profile in the D-region [PDF]
, 2008 A method based on linear regularization is presented for the deduction of the effective collision frequency profile in the D-region using an incoherent scatter radar and a colocated riometer.
Honary, Farideh, Beharrell, Matthew J.
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Stakeholder perceptions of bird-window collisions.
PLoS ONE, 2022 Bird-window collisions are a major source of human-caused avian mortality for which many mitigation and prevention options are available. However, because very little research has characterized human perspectives related to this issue, there is limited ...
Georgia J Riggs +2 more
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Research on MASS Collision Avoidance in Complex Waters Based on Deep Reinforcement Learning
Journal of Marine Science and Engineering, 2023 The research on decision-making models of ship collision avoidance is confronted with numerous challenges. These challenges encompass inadequate consideration of complex factors, including but not limited to open water scenarios, the absence of static ...
Jiao Liu +3 more
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Cooling rate of thermal electrons by electron impact excitation of fine structure levels of atomic oxygen [PDF]
Annales Geophysicae, 1999 The atomic oxygen fine structure cooling rate of thermal electrons based on new effective collision strengths for electron impact excitation of the ground-state 3P fine-structure levels in atomic oxygen have been fitted to an analytical expression ...
A. V. Pavlov +2 more
doaj +1 more source