The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Thomas Blenski - One of the best experts on this subject based on the ideXlab platform.
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The hybrid detailed / statistical opacity Code SCO-RCG: New developments and applications
2017Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:We present the hybrid opacity Code SCO-RCG which combines statistical approaches with fine-structure calculations. Radial integrals needed for the computation of detailed transition arrays are calculated by the Code SCO (Super-Configuration Code for Opacity), which calculates atomic structure at finite temperature and density, taking into account plasma effects on the wave-functions. Levels and spectral lines are then computed by an adapted RCG routine of R. D. Cowan. SCO-RCG now includes the Partially Resolved Transition Array model, which allows one to replace a complex transition array by a small-scale detailed calculation preserving energy and variance of the genuine transition array and yielding improved high-order moments. An approximate method for studying the impact of strong magnetic field on opacity and emissivity was also recently implemented.
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The hybrid opacity Code SCO-RCG: recent developments
arXiv: Atomic Physics, 2013Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:Absorption and emission spectra of multicharged-ion plasmas contain a huge number of electron Configurations and electric-dipolar lines, which can be handled by global methods. However, some transition arrays consist only of a small bunch of lines. For that reason, we developed the hybrid opacity Code SCO-RCG combining the (statistical) super-transition-array method and the (detailed) fine-structure calculation (requiring the diagonalization of the Hamiltonian matrix) of atomic structure. In order to decide whether a detailed treatment of lines is necessary and to determine the validity of statistical methods, the Code involves criteria taking into account coalescence of lines and porosity (localized absence of lines) in transition arrays. Data required for the calculation of detailed transition arrays (Slater, spin-orbit and dipolar integrals) are provided by the super-Configuration Code SCO, which takes into account plasma screening effects on wavefunctions. Then, level energies and lines are calculated by Cowan's Code. Transition arrays for which a detailed treatment is not required or impossible are described statistically, by UTA (Unresolved Transition Arrays) and STA (Super Transition Arrays) formalisms used in SCO. Recent developments are presented, such as the extension of the PRTA (Partially Resolved Transition Array) model to the hybrid approach, as well as comparisons with experimental spectra (laser or Z-pinch).
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A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
High Energy Density Physics, 2011Co-Authors: Q. Porcherot, Jean-christophe Pain, Franck Gilleron, Thomas BlenskiAbstract:Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electric-dipole (E1) lines, which are well suited for treatment by the unresolved transition array and derivative methods. But, some transition arrays show detailed features whose description requires diagonalization of the Hamiltonian matrix. We developed a hybrid opacity Code, called SCORCG, which combines statistical approaches with fine-structure calculations consistently. Data required for the computation of detailed transition arrays (atomic Configurations and atomic radial integrals) are calculated by the super-Configuration Code SCO (Super-Configuration Opacity), which provides an accurate description of the plasma screening effects on the wave-functions. Level energies as well as position and strength of spectral lines are computed by an adapted RCG routine of R. D. Cowan. The resulting Code provides opacities for hot plasmas and can handle mid-Z elements. The Code is also a powerful tool for the interpretation of recent laser and Z-pinch experimental spectra, as well as for validation of statistical methods.
Eduardo Nebot - One of the best experts on this subject based on the ideXlab platform.
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A Flexible System Architecture for Acquisition and Storage of Naturalistic Driving Data
IEEE Transactions on Intelligent Transportation Systems, 2016Co-Authors: Asher Bender, James Ward, Stewart Worrall, Marcelo L. Moreyra, Santiago Gerling Konrad, Favio R. Masson, Eduardo NebotAbstract:Innovation in intelligent transportation systems relies on analysis of high-quality data. In this paper, we describe the design principles behind our data management infrastructure. The principles we adopt place an emphasis on flexibility and maintainability. This is achieved by breaking up Code into a modular design that can be run on many independent processes. Message passing over a publish–subscribe network enables interprocess communication and promotes data-driven execution. By following these principles, rapid prototyping and experimentation with new sensing modalities and algorithms are possible. The communication library underpinning our proposed architecture is compared against several popular communication libraries. Features designed into the system make it decentralized, robust to failure, and amenable to scaling across multiple machines with minimal Configuration. Code written using the proposed architecture is compact, transparent, and easy to maintain. Experimentation shows that our proposed architecture offers a high performance when compared against alternative communication libraries.
Jean-christophe Pain - One of the best experts on this subject based on the ideXlab platform.
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The hybrid detailed / statistical opacity Code SCO-RCG: New developments and applications
2017Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:We present the hybrid opacity Code SCO-RCG which combines statistical approaches with fine-structure calculations. Radial integrals needed for the computation of detailed transition arrays are calculated by the Code SCO (Super-Configuration Code for Opacity), which calculates atomic structure at finite temperature and density, taking into account plasma effects on the wave-functions. Levels and spectral lines are then computed by an adapted RCG routine of R. D. Cowan. SCO-RCG now includes the Partially Resolved Transition Array model, which allows one to replace a complex transition array by a small-scale detailed calculation preserving energy and variance of the genuine transition array and yielding improved high-order moments. An approximate method for studying the impact of strong magnetic field on opacity and emissivity was also recently implemented.
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The hybrid opacity Code SCO-RCG: recent developments
arXiv: Atomic Physics, 2013Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:Absorption and emission spectra of multicharged-ion plasmas contain a huge number of electron Configurations and electric-dipolar lines, which can be handled by global methods. However, some transition arrays consist only of a small bunch of lines. For that reason, we developed the hybrid opacity Code SCO-RCG combining the (statistical) super-transition-array method and the (detailed) fine-structure calculation (requiring the diagonalization of the Hamiltonian matrix) of atomic structure. In order to decide whether a detailed treatment of lines is necessary and to determine the validity of statistical methods, the Code involves criteria taking into account coalescence of lines and porosity (localized absence of lines) in transition arrays. Data required for the calculation of detailed transition arrays (Slater, spin-orbit and dipolar integrals) are provided by the super-Configuration Code SCO, which takes into account plasma screening effects on wavefunctions. Then, level energies and lines are calculated by Cowan's Code. Transition arrays for which a detailed treatment is not required or impossible are described statistically, by UTA (Unresolved Transition Arrays) and STA (Super Transition Arrays) formalisms used in SCO. Recent developments are presented, such as the extension of the PRTA (Partially Resolved Transition Array) model to the hybrid approach, as well as comparisons with experimental spectra (laser or Z-pinch).
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A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
High Energy Density Physics, 2011Co-Authors: Q. Porcherot, Jean-christophe Pain, Franck Gilleron, Thomas BlenskiAbstract:Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electric-dipole (E1) lines, which are well suited for treatment by the unresolved transition array and derivative methods. But, some transition arrays show detailed features whose description requires diagonalization of the Hamiltonian matrix. We developed a hybrid opacity Code, called SCORCG, which combines statistical approaches with fine-structure calculations consistently. Data required for the computation of detailed transition arrays (atomic Configurations and atomic radial integrals) are calculated by the super-Configuration Code SCO (Super-Configuration Opacity), which provides an accurate description of the plasma screening effects on the wave-functions. Level energies as well as position and strength of spectral lines are computed by an adapted RCG routine of R. D. Cowan. The resulting Code provides opacities for hot plasmas and can handle mid-Z elements. The Code is also a powerful tool for the interpretation of recent laser and Z-pinch experimental spectra, as well as for validation of statistical methods.
Q. Porcherot - One of the best experts on this subject based on the ideXlab platform.
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The hybrid detailed / statistical opacity Code SCO-RCG: New developments and applications
2017Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:We present the hybrid opacity Code SCO-RCG which combines statistical approaches with fine-structure calculations. Radial integrals needed for the computation of detailed transition arrays are calculated by the Code SCO (Super-Configuration Code for Opacity), which calculates atomic structure at finite temperature and density, taking into account plasma effects on the wave-functions. Levels and spectral lines are then computed by an adapted RCG routine of R. D. Cowan. SCO-RCG now includes the Partially Resolved Transition Array model, which allows one to replace a complex transition array by a small-scale detailed calculation preserving energy and variance of the genuine transition array and yielding improved high-order moments. An approximate method for studying the impact of strong magnetic field on opacity and emissivity was also recently implemented.
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The hybrid opacity Code SCO-RCG: recent developments
arXiv: Atomic Physics, 2013Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:Absorption and emission spectra of multicharged-ion plasmas contain a huge number of electron Configurations and electric-dipolar lines, which can be handled by global methods. However, some transition arrays consist only of a small bunch of lines. For that reason, we developed the hybrid opacity Code SCO-RCG combining the (statistical) super-transition-array method and the (detailed) fine-structure calculation (requiring the diagonalization of the Hamiltonian matrix) of atomic structure. In order to decide whether a detailed treatment of lines is necessary and to determine the validity of statistical methods, the Code involves criteria taking into account coalescence of lines and porosity (localized absence of lines) in transition arrays. Data required for the calculation of detailed transition arrays (Slater, spin-orbit and dipolar integrals) are provided by the super-Configuration Code SCO, which takes into account plasma screening effects on wavefunctions. Then, level energies and lines are calculated by Cowan's Code. Transition arrays for which a detailed treatment is not required or impossible are described statistically, by UTA (Unresolved Transition Arrays) and STA (Super Transition Arrays) formalisms used in SCO. Recent developments are presented, such as the extension of the PRTA (Partially Resolved Transition Array) model to the hybrid approach, as well as comparisons with experimental spectra (laser or Z-pinch).
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A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
High Energy Density Physics, 2011Co-Authors: Q. Porcherot, Jean-christophe Pain, Franck Gilleron, Thomas BlenskiAbstract:Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electric-dipole (E1) lines, which are well suited for treatment by the unresolved transition array and derivative methods. But, some transition arrays show detailed features whose description requires diagonalization of the Hamiltonian matrix. We developed a hybrid opacity Code, called SCORCG, which combines statistical approaches with fine-structure calculations consistently. Data required for the computation of detailed transition arrays (atomic Configurations and atomic radial integrals) are calculated by the super-Configuration Code SCO (Super-Configuration Opacity), which provides an accurate description of the plasma screening effects on the wave-functions. Level energies as well as position and strength of spectral lines are computed by an adapted RCG routine of R. D. Cowan. The resulting Code provides opacities for hot plasmas and can handle mid-Z elements. The Code is also a powerful tool for the interpretation of recent laser and Z-pinch experimental spectra, as well as for validation of statistical methods.
Franck Gilleron - One of the best experts on this subject based on the ideXlab platform.
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The hybrid detailed / statistical opacity Code SCO-RCG: New developments and applications
2017Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:We present the hybrid opacity Code SCO-RCG which combines statistical approaches with fine-structure calculations. Radial integrals needed for the computation of detailed transition arrays are calculated by the Code SCO (Super-Configuration Code for Opacity), which calculates atomic structure at finite temperature and density, taking into account plasma effects on the wave-functions. Levels and spectral lines are then computed by an adapted RCG routine of R. D. Cowan. SCO-RCG now includes the Partially Resolved Transition Array model, which allows one to replace a complex transition array by a small-scale detailed calculation preserving energy and variance of the genuine transition array and yielding improved high-order moments. An approximate method for studying the impact of strong magnetic field on opacity and emissivity was also recently implemented.
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The hybrid opacity Code SCO-RCG: recent developments
arXiv: Atomic Physics, 2013Co-Authors: Jean-christophe Pain, Franck Gilleron, Q. Porcherot, Thomas BlenskiAbstract:Absorption and emission spectra of multicharged-ion plasmas contain a huge number of electron Configurations and electric-dipolar lines, which can be handled by global methods. However, some transition arrays consist only of a small bunch of lines. For that reason, we developed the hybrid opacity Code SCO-RCG combining the (statistical) super-transition-array method and the (detailed) fine-structure calculation (requiring the diagonalization of the Hamiltonian matrix) of atomic structure. In order to decide whether a detailed treatment of lines is necessary and to determine the validity of statistical methods, the Code involves criteria taking into account coalescence of lines and porosity (localized absence of lines) in transition arrays. Data required for the calculation of detailed transition arrays (Slater, spin-orbit and dipolar integrals) are provided by the super-Configuration Code SCO, which takes into account plasma screening effects on wavefunctions. Then, level energies and lines are calculated by Cowan's Code. Transition arrays for which a detailed treatment is not required or impossible are described statistically, by UTA (Unresolved Transition Arrays) and STA (Super Transition Arrays) formalisms used in SCO. Recent developments are presented, such as the extension of the PRTA (Partially Resolved Transition Array) model to the hybrid approach, as well as comparisons with experimental spectra (laser or Z-pinch).
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A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
High Energy Density Physics, 2011Co-Authors: Q. Porcherot, Jean-christophe Pain, Franck Gilleron, Thomas BlenskiAbstract:Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electric-dipole (E1) lines, which are well suited for treatment by the unresolved transition array and derivative methods. But, some transition arrays show detailed features whose description requires diagonalization of the Hamiltonian matrix. We developed a hybrid opacity Code, called SCORCG, which combines statistical approaches with fine-structure calculations consistently. Data required for the computation of detailed transition arrays (atomic Configurations and atomic radial integrals) are calculated by the super-Configuration Code SCO (Super-Configuration Opacity), which provides an accurate description of the plasma screening effects on the wave-functions. Level energies as well as position and strength of spectral lines are computed by an adapted RCG routine of R. D. Cowan. The resulting Code provides opacities for hot plasmas and can handle mid-Z elements. The Code is also a powerful tool for the interpretation of recent laser and Z-pinch experimental spectra, as well as for validation of statistical methods.