Tootfinder

The glassy structure of reactive supplementary cementitious materials (SCMs) and recycled glass: Contribution of XRD and Raman spectroscopy to their characterization
Th\'eodore Serbource (LSI), Mireille Courtial (LSI, UA), Marie-No\"elle de Noirfontaine (LSI), Sandrine Tusseau-Nenez (LPMC), Christophe Sandt (SSOLEIL), Laurent Izoret
https://…

The glassy structure of reactive supplementary cementitious materials (SCMs) and recycled glass: Contribution of XRD and Raman spectroscopy to their characterization
This study compares thirteen natural and industrial samples of supplementary or emerging supplementary cementitious materials (SCMs): slag, fly ashes, pozzolan, obsidian, silica fume, and recycled glass. These materials are used or are under consideration for decarbonization in cement plants. XRF, XRD and Raman microspectroscopy were used in order to achieve a deeper understanding of the structural characterization of SCMs. The changes in position and shape of the XRD diffuse halos were compare…

This https://arxiv.org/abs/2309.06830 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Unveiling the X-ray polarimetric properties of LMC X-3 with IXPE, NICER, and Swift/XRT
The incoming Imaging X-ray Polarimetry Explorer (IXPE) observations of X-ray binaries provide a new tool to investigate the underlying accretion geometry. Here we report the first measurements of X-ray polarization of the extra-galactic black-hole X-ray binary LMC X$-$3. We find a polarization fraction of $\sim 3%$ at a polarization angle of $\sim 135^\circ$ in the $2-8$ keV energy band with statistical significance at the 7$σ$ level. This polarization measurement significantly exceeds the min…

Origin of the Very High Energy {\gamma}-rays in the Low-luminosity Active Galactic Nucleus NGC 4278
Ji-Shun Lian (BIT), Jia-Xuan Li (BIT), Xin-Ke Hu (GXU), Ying-Ying Gan (BIT), Tan-Zheng Wu (BIT), Jin Zhang (BIT)
https://arxiv.org/abs/2405.00347

Origin of the Very High Energy γ-rays in the Low-luminosity Active Galactic Nucleus NGC 4278
NGC 4278, a Low-luminosity active galactic nucleus (AGN), is generally classified as a low-ionization nuclear emission line region (LINER) type AGN. Recently, it is reported to be associated with a very high energy (VHE) $γ$-ray source 1LHAASO J1219+2915 in the first Large High Altitude Air Shower Observatory (LHAASO) source catalog. However, no associated counterpart has been detected by Fermi-LAT. By analyzing its X-ray observation data from Swift-XRT, we find it is in a high-flux state on M…

This https://arxiv.org/abs/2306.05855 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Probing electromagnetic-gravitational wave emission coincidence in type I binary-driven hypernova family of long GRBs at very-high redshift
The repointing time of the XRT instrument on the Neil Gehrels Swift Observatory satellite has posed challenges in observing and studying the early X-ray emissions within $\approx40$ s after a gamma-ray burst (GRB) trigger. To address this issue, we adopt a novel approach that capitalizes on the cosmological time dilation in GRBs with redshifts ranging from $3$ to $9$. Applying this strategy to Swift/XRT data, we investigate the earliest X-ray emissions of $368$ GRBs from the Swift catalog, incl…

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https://open.spotify.com/track/37XRu4Dhx0enWef3Zcy1qW
https://thesewimps.bandcamp.com/track/lake-washington

Accurate and Data-Efficient Micro-XRD Phase Identification Using Multi-Task Learning: Application to Hydrothermal Fluids
Yanfei Li, Juejing Liu, Xiaodong Zhao, Wenjun Liu, Tong Geng, Ang Li, Xin Zhang
https://arxiv.org/abs/2403.10042

Accurate and Data-Efficient Micro-XRD Phase Identification Using Multi-Task Learning: Application to Hydrothermal Fluids
Traditional analysis of highly distorted micro-X-ray diffraction (μ-XRD) patterns from hydrothermal fluid environments is a time-consuming process, often requiring substantial data preprocessing and labeled experimental data. This study demonstrates the potential of deep learning with a multitask learning (MTL) architecture to overcome these limitations. We trained MTL models to identify phase information in μ-XRD patterns, minimizing the need for labeled experimental data and masking preproc…

Black hole mass estimate in OJ 287 based on the bulk-motion comptonization model
Sergey Kuznetsov, Lev Titarchuk
https://arxiv.org/abs/2403.17267 https://<…

Black hole mass estimate in OJ 287 based on the bulk-motion comptonization model
The multi-wavelength outburst activity in the BL Lacertae source OJ 287 has sparked a lot of controversy about whether the source contains one or two black holes (BHs) and what characteristics of this black hole binary would be. In this article we present the results of analysis of the X-ray flaring activity of OJ 287 using the data of Swift/XRT observations. We discovered that the energy spectra in all spectral states can be adequately fit with the XSPEC BMC model (the Comptonization one). As …

Signature of Particle Diffusion on the X-ray Spectra of the blazar Mkn 421
C. Baheeja, S. Sahayanathan, F. M. Rieger, C. D. Ravikumar
https://arxiv.org/abs/2404.15171

Signature of Particle Diffusion on the X-ray Spectra of the blazar Mkn 421
The curvature in blazar spectrum has the potential to understand the particle dynamics in jets. We performed a detailed analysis of simultaneous Swift-XRT (0.3-10 keV) and NuSTAR (3-79 keV)} observations of Mkn 421. Our analysis of NuSTAR observations alone reveals that, during periods of low flux, the hard X-ray spectra are best represented by a steep power-law with photon index reaching $\sim$ 3. However, the spectrum exhibits significant curvature during its high flux states. To investigate …

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
Alberto Ulgiati, Simona Paiano, Aldo Treves, Renato Falomo, Boris Sbarufatti, Fabio Pintore, Thomas D. Russell, Giancarlo Cusumano
https://arxiv.org/abs/2402.12081

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
The fourth-DR3 version (4FGL-DR3) of the Fermi/LAT catalogue of $γ$-ray sources contains $\sim$ 1000 objects at a galactic latitude |b| > 10$^{\circ}$ which are not identified with an optical counterpart (UGS). We performed a systematic study of these sources, focusing on 190 objects that have a unique X-ray counterpart in the available Swift/XRT observations. Optical counterparts are then selected, and for 33 sources optical spectra were found in the literature. We found that 21 can…

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
Alberto Ulgiati, Simona Paiano, Aldo Treves, Renato Falomo, Boris Sbarufatti, Fabio Pintore, Thomas D. Russell, Giancarlo Cusumano
https://arxiv.org/abs/2402.12081

Spectroscopy of a Sample of Unidentified Gamma-ray Fermi Sources
The fourth-DR3 version (4FGL-DR3) of the Fermi/LAT catalogue of $γ$-ray sources contains $\sim$ 1000 objects at a galactic latitude |b| > 10$^{\circ}$ which are not identified with an optical counterpart (UGS). We performed a systematic study of these sources, focusing on 190 objects that have a unique X-ray counterpart in the available Swift/XRT observations. Optical counterparts are then selected, and for 33 sources optical spectra were found in the literature. We found that 21 can…