Article
Physics, Multidisciplinary
Dong-min Kim, Sinwoo Choi, Jungwan Cho, Mikyung Lim, Bong Jae Lee
Summary: We experimentally demonstrate boosted in-plane thermal conduction by surface plasmon polaritons (SPPs) propagating along a thin Ti film on a glass substrate. We show that SPPs can propagate over centimeter-scale distances even along a supported metal film, and quantitatively validate the resulting ballistic heat conduction. Moreover, we experimentally demonstrate a significant enhancement of in-plane thermal conductivity compared to bulk value (approximately 25%) for a 100-nm-thick Ti film on a glass substrate. This research provides a new avenue to employ SPPs for heat dissipation along a supported thin film and can potentially mitigate hot-spot issues in microelectronics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
M. Gornostaev
Summary: This paper presents the results of 3D modeling of accretion columns on strongly magnetized neutron stars, studying the changes in column structure and X-ray continuum shape depending on physical parameters. Multiple 3D models of accretion columns were constructed based on numerical simulations, revealing distributions of radiation flux and investigating non-axially symmetric sidewalls. The study also included self-consistent modeling of spectral radiative transfer and two-dimensional spatial structure, considering both thermal and bulk Comptonization.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Prithish Halder, Shashikiran Ganesh
Summary: This work introduces a comet dust model that incorporates multiple dust morphologies to replicate the standard polarization-phase curve observed in several comets. Different mixing combinations of dust morphologies are studied to fit various types of comets. Long period comets may have higher percentage of loose particles compared to short period comets, possibly due to more frequent and/or higher magnitude of weathering.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Quentin Pognan, Anders Jerkstrand, Jon Grumer
Summary: A binary neutron star merger produces a transient known as a kilonova. Our analysis shows deviations from LTE in the level populations several days after merger. NLTE excitation is lower, resulting in lower expansion opacities. NLTE modelling is important for later phases and can result in higher or lower opacities, depending on composition and wavelength.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Zhenyu Wu, Giacomo Ricigliano, Rahul Kashyap, Albino Perego, David Radice
Summary: We developed a method to compute synthetic kilonova light curves by combining numerical relativity simulations and radiation-hydrodynamics code. Our approach was validated and applied to different scenarios, studying the sensitivity of the results to various factors. The study showed that hydrodynamic effects are typically negligible and homologous expansion is a good approximation, but pressure forces can amplify uncertainties in the heating rates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Qi Li, Xiaodong Yang
Summary: A novel three-dimensional thermo-hydraulic coupling model was developed to simulate surface formation in electrical discharge machining (EDM). The model considered the melt flow induced surface deformation, temperature-dependent material properties, phase changes, and practical forces on melt pools. Simulation results demonstrated the radial melt flow during single-pulse discharge and the formation of surface peaks during multiple discharges. The proposed model provided accurate measurements of crater diameter, surface roughness, and recast layer thickness.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2024)
Article
Astronomy & Astrophysics
Christine E. Collins, Andreas Bauswein, Stuart A. Sim, Vimal Vijayan, Gabriel Martinez-Pinedo, Oliver Just, Luke J. Shingles, Markus Kromer
Summary: The detection of GW170817 and its electromagnetic counterpart AT2017gfo has provided valuable constraints for theoretical models of neutron star mergers and nucleosynthesis. Using a Monte Carlo radiative transfer code, the authors simulate synthetic light curves of the dynamical ejecta from a neutron star merger, taking into account neutrino interactions. They find that emission along polar lines of sight is brighter than that along equatorial lines of sight, and the bolometric light curve exhibits a monotonic decline with a shoulder when the ejecta becomes optically thin. The observed color evolution of AT2017gfo is reproduced by the simulation. The addition of a spherically symmetric secular ejecta component enhances the emission, leading to a shift in the shoulder time from 1-2 days to 6-10 days.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. J. Fontes, C. L. Fryer, R. T. Wollaeger, M. R. Mumpower, T. M. Sprouse
Summary: This paper extends previous calculations of lanthanide opacities to include actinide opacities, and demonstrates their usefulness in kilonova simulations. The opacities exhibit similar trends to lanthanide opacities, but produce different results for different actinide elements. Opacity tables for 14 actinide elements are provided for general usage. The study also explores the impact of different actinide abundance distributions and choices of ejecta mass and velocity on light curves and spectra. The results indicate that actinides with Z >= 99 do not significantly contribute to the opacity, while protactinium produces faint spectral features in the far-infrared.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Engineering, Marine
Paolo Lazzari, Eva Alvarez, Elena TerziC, Gianpiero Cossarini, Ilya Chernov, Fabrizio D'Ortenzio, Emanuele Organelli
Summary: This study used a 3D biogeochemical model to investigate the spatial and temporal variability of chromophoric-dissolved organic matter in the Mediterranean Sea, analyzing the dynamics of dissolved organic carbon, CDOM source and degradation processes, as well as optical properties. The results showed that different parameterizations of DOC-release influenced the accumulation of CDOM in the eastern Mediterranean and resulted in different reflectance characteristics, highlighting the importance of the bio-optical model in validating hypotheses on CDOM cycling.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Astronomy & Astrophysics
Rebecca Centeno, Jaime de la Cruz Rodriguez, Tanausu del Pino Aleman
Summary: The study evaluates the applicability of existing spectral line inversion codes in inferring the magnetic field vector and its transverse component, finding that scattering polarization signatures may introduce significant errors in estimating magnetic field strength.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Christian N. Setzer, Hiranya Peiris, Oleg Korobkin, Stephan Rosswog
Summary: The 2017 detection of a kilonova coincident with gravitational-wave emission has confirmed neutron star mergers as the major source of heavy elements and constrained alternative theories of gravity. With only one confident detection available, improved theoretical understanding is needed to model the diverse signals expected from such a population. Quick and calibrated models are required to design observational strategies and interpret new observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. J. Teffs, S. J. Prentice, P. A. Mazzali, C. Ashall
Summary: SN 2017ein is a narrow-lined Type Ic SN, and the modeling results of its photospheric and nebular phases show consistency in mass, energy, and nickel mass, indicating possible asymmetry in the innermost ejecta and proposing a hypothesis of a low-mass progenitor, with the contradiction to the high-mass progenitor possibly due to the pre-supernova source not representing the actual progenitor.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. Jaume Bestard, J. Trujillo Bueno, J. Stepan, T. del Pino Aleman
Summary: The study focuses on the scattering polarization signals of the core Ca I 4227 A line in the lower solar chromosphere, using a magnetohydrodynamical 3D model to investigate the effects of horizontal velocity gradients and magnetic fields. It is found that significant forward scattering polarization signals are generated by spatial gradients of horizontal velocity components, while the Hanle effect tends to depolarize them in regions with strong magnetic fields.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Daniela Barrientos Acevedo, Arjen van der Wel, Maarten Baes, Robert J. J. Grand, Anand Utsav Kapoor, Peter Camps, Anna de Graaff, Caroline M. S. Straatman, Rachel Bezanson
Summary: We propose a framework to generate realistic mock spectroscopic observations for hydrodynamical simulations, using high-resolution stellar population models and full radiative transfer treatment. Applying this framework to the Auriga cosmological zoom simulations, we generate stellar continuum mock observations and compare them to observations from the SAMI galaxy survey. We find that the kinematics produced by Auriga are in good agreement with the observations, considering the effects of dust and observation limitations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Shannara Kayleigh Taylor Parkins, Swathi Murthy, Cristian Picioreanu, Michael Kuhl
Summary: Coral reefs are built by calcifying coral animals that engage in a symbiosis with dinoflagellate microalgae. A multiphysics modeling approach using Monte Carlo simulations has been used to study the light, temperature, and oxygen gradients in coral tissue and skeleton, providing insights into the structure-function mechanisms that shape the microenvironment and ecophysiology of the coral symbiosis in response to environmental change.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2021)
Article
Physics, Fluids & Plasmas
Aurelien Guy, Anne Bourdon, Marie-Yvonne Perrin
PHYSICS OF PLASMAS
(2015)
Article
Thermodynamics
A. Lemal, C. M. Jacobs, M. -Y. Perrin, C. O. Laux, P. Tran, E. Raynaud
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Thermodynamics
A. Lemal, C. M. Jacobs, M. -Y. Perrin, C. O. Laux, P. Tran, E. Raynaud
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Chemistry, Physical
Aurelien Guy, Anne Bourdon, Marie-Yvonne Perrin
Article
Physics, Applied
B. Peyrou, L. Chemartin, Ph Lalande, B. G. Cheron, Ph Riviere, M-Y Perrin, A. Soufiani
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2012)
Article
Optics
Jean-Michel Lamet, Yacine Babou, Philippe Riviere, Marie-Yvonne Perrin, Anouar Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2008)
Review
Optics
Yacine Babou, Philippe Riviere, Marie-Yvonne Perrin, Anouar Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2009)
Article
Optics
Jean-Michel Lamet, Philippe Riviere, Marie-Yvonne Perrin, Anouar Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2010)
Article
Optics
S. Depraz, M. Y. Perrin, Ph Riviere, A. Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2012)
Article
Optics
S. Depraz, M. Y. Perrin, A. Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2012)
Article
Thermodynamics
Bruno Lopez, Marie Yvonne Perrin, Philippe Riviere, Anouar Soufiani
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2013)
Article
Physics, Fluids & Plasmas
Yacine Babou, Philippe Riviere, Marie-Yvonne Perrin, Anouar Soufiani
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2008)
Article
Thermodynamics
Y. Babou, Ph. Riviere, M-Y. Perrin, A. Soufiani
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2009)
Article
Optics
Marie-Yvonne Perrin, Anouar Soufiani
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2007)
