Tootfinder

Multiscale modeling of hydrogen diffusion in iron considering the effect of dislocations
Gonzalo \'Alvarez, \'Alvaro Ridruejo, Javier Segurado
https://arxiv.org/abs/2506.20439

Multiscale modeling of hydrogen diffusion in iron considering the effect of dislocations
Modeling hydrogen diffusion and its absorption in traps is a fundamental first step towards the understanding and prediction of hydrogen embrittlement. In this study, a multiscale approach which includes DFT simulations, OkMC, and phase-field dislocations, is developed to study the movement of hydrogen atoms in alpha-iron crystals containing dislocations. At the nanoscale the interaction energies of hydrogen on different sites of the iron lattice are studied using DFT. At the microscale, this i…

Inside the Iron Curtain: A Long Term Look at the Iron Stars XX Oph and AS 325
Steve B. Howell, Venu M. Kalari, Andy Adamson, Mark Everett
https://arxiv.org/abs/2507.15750

Inside the Iron Curtain: A Long Term Look at the Iron Stars XX Oph and AS 325
The Iron Stars XX Oph and AS 325, both binaries consisting of a Be + late K,M II star present remarkable optical spectra. Low velocity, dense winds from the late type star collide with high velocity, optically thin material expelled from the hot Be star producing a plethora of emission lines and complex P Cygni absorption profiles. The members of the American Association of Variable Star Observers have faithfully observed XX Oph for 85 years and AS 325 for 32 years. This long term photometric m…

Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics
Jie Qian, Qi Hong, Zi-Yuan Wang, Wen-Xin Wu, Yihao Yang, C. -M. Hu, J. Q. You, Yi-Pu Wang
https://arxiv.org/abs/2507.16698

Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics
Chiral coupling opens new avenues for controlling and exploiting light-matter interactions. We demonstrate that chiral coupling can be utilized to achieve unidirectional perfect absorption. In our experiments, chiral magnon-photon coupling is realized by coupling the magnon modes in yttrium iron garnet (YIG) spheres with spin-momentum-locked waveguide modes supported by spoof surface plasmon polaritons (SSPPs). These photon modes exhibit transverse spin, with the spin direction determined by th…

BASS. XLIX. Characterization of highly luminous and obscured AGNs: local X-ray and [NeV]$\lambda$3426 emission in comparison with the high-redshift Universe
Alessandro Peca, Michael J. Koss, Kyuseok Oh, Claudio Ricci, Benny Trakhtenbrot, Richard Mushotzky, Ezequiel Treister, C. Megan Urry, Andrealuna Pizzetti, Kohei Ichikawa, Alessia Tortosa, Federica Ricci, Matilde Signorini, Darshan Kakkad, Chin-Shin Chang, Giovanni Mazzolari, Turgay Caglar, Macon Magno, Ignacio del Moral-Castro, Pet…

BASS. XLIX. Characterization of highly luminous and obscured AGNs: local X-ray and [NeV]$λ$3426 emission in comparison with the high-redshift Universe
We present a detailed analysis of the most luminous and obscured Active Galactic Nuclei (AGNs) detected in the ultra-hard X-ray band (14-195 keV) by Swift/BAT. Our sample comprises 21 X-ray luminous (log $L_X/{\rm erg\,s^{-1}}>44.6$, 2-10 keV) AGNs at $z<0.6$, optically classified as Seyfert 1.9-2. Using NuSTAR, XMM-Newton, Suzaku, and Chandra, we constrain AGN properties such as absorption column density $N_H$, photon index $Γ$, intrinsic $L_X$, covering factor, and iron K$α$ equivalent widt…