Results 21 to 30 of about 6,084,559 (245)

Atomic Data Assessment with PyNeb: Radiative and Electron Impact Excitation Rates for [Fe ii] and [Fe iii]

open access: yesAtoms, 2023
We use the PyNeb 1.1.16 Python package to evaluate the atomic datasets available for the spectral modeling of [Fe ii] and [Fe iii], which list level energies, A-values, and effective collision strengths.
Claudio Mendoza   +4 more
doaj   +1 more source

Effective collision strengths between Mg i and electrons [PDF]

open access: yesAstronomy & Astrophysics, 2015
The treatment of the inelastic collisions with electrons and hydrogen atoms are the main source of uncertainties in non-Local Thermodynamic Equilibrium (LTE) spectral line computations. We report, in this research note, quantum mechanical data for 369 collisional transitions of \ion{Mg}{I} with electrons for temperatures comprised between 500 and 20000~
Merle, Thibault   +2 more
openaire   +3 more sources

Atomic Data Assessment with PyNeb

open access: yesAtoms, 2020
PyNeb is a Python package widely used to model emission lines in gaseous nebulae. We take advantage of its object-oriented architecture, class methods, and historical atomic database to structure a practical environment for atomic data assessment.
Christophe Morisset   +5 more
doaj   +1 more source

Unmanned Aerial Vehicles for Search and Rescue: A Survey

open access: yesRemote Sensing, 2023
In recent years, unmanned aerial vehicles (UAVs) have gained popularity due to their flexibility, mobility, and accessibility in various fields, including search and rescue (SAR) operations.
Mingyang Lyu   +3 more
doaj   +1 more source

Radiative Rates and Electron Impact Excitation Rates for Transitions in He II

open access: yesAtoms, 2017
We report calculations of energy levels, radiative rates, collision strengths and effective collision strengths for transitions among the lowest 25 levels of the n ≤ 5 configurations of He II.
Kanti M. Aggarwal   +3 more
doaj   +1 more source

Discrepancies in Atomic Data and Suggestions for Their Resolutions

open access: yesAtoms, 2017
The analysis and modelling of a range of plasmas (for example, astrophysical, laser- produced and fusion) require atomic data for a number of parameters, such as energy levels, radiative rates and electron impact excitation rates, or equivalently, the ...
Kanti M. Aggarwal
doaj   +1 more source

Measurement of the properties of Higgs boson production at s $$ \sqrt{s} $$ = 13 TeV in the H → γγ channel using 139 fb −1 of pp collision data with the ATLAS experiment

open access: yesJournal of High Energy Physics, 2023
Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb −1 of pp collision data at s $$ \sqrt{s} $$ = 13 TeV collected by the ATLAS experiment at the LHC. The analysis is based on the definition of
The ATLAS collaboration   +2905 more
doaj   +1 more source

Electron Impact Excitation of S III: An Assessment

open access: yesAtoms, 2019
In a recent paper, Tayal et al. (Astrophys. J. Suppl. 2019, 242, 9) reported results for energy levels, radiative rates (A-values), and effective collision strengths ( Υ ) for transitions among the 198 levels of Si-like S III.
Kanti M. Aggarwal
doaj   +1 more source

批判教育學視角的課程反思與實踐:以三位國文科社群教師為例 Curriculum Reflections and Practice From the Perspective of Critical Pedagogy: Taking Three Mandarin Teachers of a Professional Learning Community as an Example

open access: yesJournal of Research in Education Sciences, 2023
本研究從批判教育學的視角,探究三位國文科教師於社群中,藉由備課、觀課與議課的對話所進行的課程反思與實踐。此為期2年的研究以某國中教師社群其中三位國文科教師為個案,並採課室暨社群觀察、回溯性的訪談,以及相關文件進行資料蒐集。研究發現教師社群作為提供個別教師對話與反思的場域,讓教師得以看見國文科課程與教學的限制,並覺察自身處於夾縫中的改革行動,三位教師的課程實踐具備「理解學生脈絡」、「反思性的學習」、「共構批判性知識」三種特性。在實踐過程中,課程反思與師生關係的覺醒,能打破現存結構對國文科教師的定義 ...
洪郁婷*, 卯靜儒
doaj   +1 more source

Towards the Provision of Accurate Atomic Data for Neutral Iron

open access: yesGalaxies, 2018
The rich emission and absorption line spectra of Fe I may be used to extract crucial information on astrophysical plasmas, such as stellar metallicities.
Andrew Conroy   +3 more
doaj   +1 more source

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