Results 41 to 50 of about 162 (82)

Another Proof of the Four Colour Theorem -- Part 2 -- Discharging a minimal 5-Chromatic Planar Graph

, 2022
In RSST, they "replace the mammoth hand-checking of unavoidability that A&H required, by another mammoth hand-checkable proof " (page 18). Here, the proof of unavoidability is accomplished in a lengthy structured hand-checkable proof whose entirety is ...
Allaire, Frank
core  

Spectroscopy of diagnostically-important magnetic-dipole lines in highly-charged 3d$^n$ ions of tungsten

, 2011
An electron beam ion trap (EBIT) is used to measure extreme ultraviolet spectra between 10 nm and 25 nm from highly-charged ions of tungsten with an open 3d shell (W XLVIII through W LVI).
Draganić, I. N., Gillaspy, J. D., Osin, D., Ralchenko, Yu., Reader, J.   +4 more
core   +1 more source

On the number of atomic configurations in hot plasmas [PDF]

arXiv
We propose approximate and accurate formulas for the number of electron configurations in hot plasmas. Such a quantity is an ingredient of algorithms devoted to the generation of configurations or superconfigurations, which is a pre-requisite of opacity calculations.
arxiv  

Charge State Distributions in Dense Plasmas

, 2020
Charge state distributions in hot, dense plasmas are a key ingredient in the calculation of spectral quantities like the opacity. However, they are challenging to calculate, as models like Saha-Boltzmann become unreliable for dense, quantum plasmas. Here
Fontes, C. J., Gill, N. M., Johns, W., Shaffer, N. R., Starrett, C. E., White, J.   +5 more
core  

Evaluation of X-ray Spectroscopic Techniques for Determining Temperature and Density in Plasmas [PDF]

, 2019
Temperature and density measurements of plasmas are important for understanding various phenomena. For example, equations of state, most scaling arguments for Inertial Confinement Fusion and laboratory astrophysics all rely upon accurate knowledge of ...
Lane, Theodore Scott
core   +1 more source

EMISSION X DE PLASMAS CHAUDS HORS EQUILIBRE THERMODYNAMIQUE LOCAL CREES PAR LASER [PDF]

, 2015
X-ray emission of mid to high Z plasmas not in local thermodynamic equilibrium (LTE) is particularly difficult to modelize due to high number of electronic transitions to take into account.
Anne-Claire, Bourgaux
core   +2 more sources

Advances in NLTE Modeling for Integrated Simulations [PDF]

, 2009
The last few years have seen significant progress in constructing the atomic models required for non-local thermodynamic equilibrium (NLTE) simulations.
Hansen, S B, Scott, H A
core  

The electron shuffle: Cerium influences samarium 4f orbital occupancy in heteronuclear Ce-Sm oxide clusters. [PDF]

J Chem Phys, 2017
Kafader JO, Topolski JE, Marrero-Colon V, Iyengar SS, Jarrold CC.   +4 more
europepmc   +1 more source

On the computation of moments in the Super-Transition-Arrays model for radiative opacity calculations

In the Super-Transition-Array statistical method for the computation of radiative opacity of hot dense matter, the moments of the absorption or emission features involve partition functions with reduced degeneracies, occurring through the calculation of ...
Pain, Jean-Christophe, Wilson, Brian
core  

Hybrid calculation of hot plasma radiative properties at local thermodynamic equilibrium involving energy levels, configurations and superconfigurations. [PDF]

, 2012
In hot dense plasmas, most energy transfer is due to radiation. Therefore, the effects of opacity on structure and evolution of plasmas are quite important. Normally, detailed line by line calculation of plasma opacities give the most precise results, but sometimes requires such an amount of resources it is not tractable.
openaire   +1 more source