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| 1 | Parametrization of Mean Radiative Properties of Optically Thin Steady-State Plasmas and Applications显示文摘Plasma radiative properties play a pivotal role both in nuclear fusion and astrophysics.They are essential to analyze and explain experiments or observations and also in radiative-hydrodynamics simulations.Their computation requires the generation of large atomic databases and the calculation,by solving a set of rate equations,of a huge number of atomic level populations in wide ranges of plasma conditions.These facts make that,for example,radiative-hydrodynamics in-line simulations be almost infeasible.This has lead to develop analytical expressions based on the parametrization of radiative properties.However,most of them are accurate only for coronal or local thermodynamic equilibrium.In this work we present a code for the parametrization of plasma radiative properties of mono-component plasmas,in terms of plasma density and temperature,such as radiative power loss,the Planck and Rosseland mean opacities and the average ionization,which is valid for steady-state optically thin plasmas in wide ranges of plasma densities and temperatures.Furthermore,we also present some applications of this parametrization such as the analysis of the optical depth and radiative character of plasmas,the use to perform diagnostics of the electron temperature,the determination of mean radiative properties for multicomponent plasmas and the analysis of radiative cooling instabilities in some kind of experiments on high-energy density laboratory astrophysics.Finally,to ease the use of the code for the parametrization,this one has been integrated in a user interface and brief comments about it are presented. | R.Rodriguez G.Espinosa J.M.Gil J.G.Rubiano M.A.Mendoza P.Martel E.Minguez | 2014 | Communications in Computational Physics2014，16，8： | 0 |
| 2 | Analysis of microscopic properties of radiative shock experiments performed at the Orion laser facility显示文摘In this work we have conducted a study on the radiative and spectroscopic properties of the radiative precursor and the post-shock region from experiments with radiative shocks in xenon performed at the Orion laser facility. The study is based on post-processing of radiation-hydrodynamics simulations of the experiment. In particular, we have analyzed the thermodynamic regime of the plasma, the charge state distributions, the monochromatic opacities and emissivities, and the specific intensities for plasma conditions of both regions. The study of the intensities is a useful tool to estimate ranges of electron temperatures present in the xenon plasma in these experiments and the analysis performed of the microscopic properties commented above helps to better understand the intensity spectra. Finally, a theoretical analysis of the possibility of the onset of isobaric thermal instabilities in the post-shock has been made, concluding that the instabilities obtained in the radiative-hydrodynamic simulations could be thermal ones due to strong radiative cooling. | R.Rodriguez G.Espinosa J.M.Gil E Suzuki-Vidal T.Clayson C.Stehle E Graham | 2018 | High Power Laser Science and Engineering2018，6，2： | 0 |
| 3 | A System Identification-based Modeling Framework of Bidirectional DC-DC Converters for Power Grids显示文摘This paper proposes a system identification framework based on eigensystem realization to accurately model power electronic converters.The proposed framework affords an energy-based optimal reduction method to precisely identify the dynamics of power electronic converters from simulated or actual raw data measured at the converter’s ports.This method does not require any prior knowledge of the topology or internal parameters of the converter to derive the system modal information.The accuracy and feasibility of the proposed method are exhaustively evaluated via simulations and practical tests on a software-simulated and hardware-implemented dual active bridge(DAB)converter under steady-state and transient conditions.After various comparisons with the Fourier series-based generalized average model,switching model,and experimental measurements,the proposed method attains a root mean square error(RMSE)of less than 1%with respect to the actual raw data.Moreover,the computational effort is reduced to 1/8.6 of the Fourier series-based model. | Gabriel E.Mejia-Ruiz Mario R.A.Paternina Juan R.Rodriguez R. Juan M.Ramirez Alejandro Zamora-Mendez Guillermo Bolivar-O. | 2022 | Journal of Modern Power Systems and Clean Energy2022，10，3： | 0 |
| 4 | Acupuncture Forbidden Points for Low Back Pain in Pregnancy: A Literature Review Synthesis显示文摘There has long been a controversy whether forbidden points truly exist, or if they have any bearing in contemporary practice. This study used literature review synthesis method to examine the application of acupuncture at the 'forbidden points' for low back pain and pelvic pain in pregnancy. This study addresses the potential implications of needling the forbidden points during pregnancy. | Debbie R.Rodriguez Lawrence J.Ryan | 2014 | Journal of Acupuncture and Tuina Science2014，12，2： | 0 |
| 5 | Collisional-Radiative Calculations of Optically Thin and Thick Plasmas Using the Computational Package ABAKO/RAPCAL显示文摘Non-local thermodynamic equilibrium(NLTE)conditions are universal in laboratory and astrophysical plasmas and,for this reason,the theory of NLTE plasmas is nowadays a very active subject.The populations of atomic levels and radiative properties are essential magnitudes in the study of these plasmas and the calculation of those properties relies on the so-called collisional-radiative(CR)models.However,the complexity of these models has led to the development of numerous collisionalradiative codes and this is a current research topic in plasmas.In this work is presented a versatile computational package,named ABAKO/RAPCAL,to calculate the populations of atomic levels and radiative properties of optically thin and thick,lowto-high Z,NLTE plasmas.ABAKO/RAPCAL combines a set of analytical approximations which yield substantial savings in computing running time,still comparing well with more elaborated codes and experimental data.In order to show the capabilities of the code and the accuracy of its results,calculations of several relevant plasma magnitudes for various plasma situations are shown and compared. | R.Rodriguez R.Florido J.M.Gil J.G.Rubiano D.Suarez P.Martel E.Minguez R.C.Mancini | 2010 | Communications in Computational Physics2010，8，6： | 0 |
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