Results 151 to 160 of about 35,694,720 (305)

The unusual emission line spectrum of I Zw 1

, 2004
International audienceMost Seyfert 1 galaxies show strong Fe II lines in their spectrum having the velocity and width of the broad emission lines. To remove the Fe II contribution in these objects, an accurate template is necessary.
Véron, P., Véron-Cetty, M.-P., Joly, Monique   +2 more
core   +2 more sources

Robust Extraction of Global 21 cm Spectrum from Experiments with a Chromatic Beam Based on Physics-motivated Error Modeling

The Astrophysical Journal
The extraction of the sky-averaged 21 cm signal from Cosmic Dawn and the Epoch of Reionization faces significant challenges. The bright and anisotropic Galactic foreground, which is 4–5 orders of magnitude brighter than the 21 cm signal, when convolved ...
Haoran Li, Furen Deng, Meng Zhou, Yidong Xu, Xuelei Chen   +4 more
doaj   +1 more source

dynoGP: Deep Gaussian Processes for Dynamic System Identification

International Journal of Adaptive Control and Signal Processing, EarlyView.
This work introduces a novel class of deep models for system identification, dynamical deep Gaussian processes, which combine the strengths of data‐driven methods, such as those based on neural network architectures, with the ability to output a probability distribution for uncertainty representation.
Alessio Benavoli, Marco Forgione, Dario Piga, Marco Zaffalon   +3 more
wiley   +1 more source

β‐Catenin/c‐Myc Axis Modulates Autophagy Response to Different Ammonia Concentrations

Advanced Biology, Volume 9, Issue 3, March 2025.
Ammonia, detoxified by the liver into urea and glutamine, impacts autophagy differently at varying levels. Low ammonia activates autophagy via c‐Myc and β‐catenin, while high levels suppress it. Using Huh7 cells and Spf‐ash mice, c‐Myc's role in cytoprotective autophagy is revealed, offering insights into hyperammonemia and potential therapeutic ...
S. Sergio, B. Spedicato, G. Corallo, A. Inguscio, M. Greco, D. Musarò, D. Vergara, A. F. Muro, G. De Sabbata, L. R. Soria, N. Brunetti Pierri, M. Maffia   +11 more
wiley   +1 more source

Reionization Parameter Inference from 3D Minkowski Functionals of the 21 cm Signals

The Astrophysical Journal
The Minkowski functionals (MFs), a set of topological summary statistics, have emerged as a powerful tool for extracting non-Gaussian information.
Kangning Diao, Zhaoting Chen, Xuelei Chen, Yi Mao   +3 more
doaj   +1 more source

Monitoring AGNs with Hβ Asymmetry. V. Long-term Variation and Evolution of the Broad Hβ Emission-line Profiles

The Astrophysical Journal Supplement Series
Abstract The physical origins of the diverse emission-line asymmetries observed in the spectra of active galactic nuclei (AGNs) are not completely understood. Monitoring the temporal variations of line profiles offers a promising approach to investigating the underlying physics.
Feng-Na Fang, Pu Du, Michael S. Brotherton, Jacob N. McLane, T. E. Zastrocky, Kianna A. Olson, Dong-Wei Bao, Shuo Zhai, Hua-Rui Bai, Yi-Xin Fu, Bi-Xuan Zhao, Yong-Jie Chen, Yue-Chang Peng, Yu-Yang Songsheng, Yan-Rong Li, Chen Hu, Ming Xiao, Bo-Wei Jiang, Yi-Lin Wang, Hao Zhang, Yu Zhao, Jia-Qi Feng, Yi-Peng Zhao, David H. Kasper, William T. Chick, My L. Nguyen, Jaya Maithil, H. A. Kobulnicky, D. A. Dale, Derek Hand, C. Adelman, Z. Carter, G. M. Murphree, M. Oeur, S. Schonsberg, T. Roth, Hartmut Winkler, Paola Marziani, Mauro D’Onofrio, Keith Horne, Luis C. Ho, Jin-Ming Bai, Jian-Min Wang, (MAHA Collaboration)   +43 more
openaire   +3 more sources

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

Simulation-based Inference of Reionization Parameters from 3D Tomographic 21 cm Light-cone Images. II. Application of Solid Harmonic Wavelet Scattering Transform

The Astrophysical Journal
The information regarding how the intergalactic medium is reionized by astrophysical sources is contained in the tomographic three-dimensional 21 cm images from the epoch of reionization. In Zhao et al.
Xiaosheng Zhao, Yi Mao, Shifan Zuo, Benjamin D. Wandelt   +3 more
doaj   +1 more source

Thermodynamic Pathways of Nonequilibrium Solidification in Wire‐Arc Additive Manufacturing Fe‐Based Multicomponent Alloy Structures

Advanced Engineering Materials, EarlyView.
Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios, Anthony Gonzalez, Aleksander Aleman, Tyler Dolmetsch, Tanaji Paul, Arvind Agarwal   +5 more
wiley   +1 more source

Extracting the Epoch of Reionization Signal with 3D U-Net Neural Networks Using a Data-driven Systematic Effect Model

The Astrophysical Journal
Neutral hydrogen serves as a crucial probe for the Cosmic Dawn and the Epoch of Reionization (EoR). Actual observations of the 21 cm signal often encounter challenges such as thermal noise and various systematic effects.
Li-Yang Gao, Léon V. E. Koopmans, Florent G. Mertens, Satyapan Munshi, Yichao Li, Stefanie A. Brackenhoff, Emilio Ceccotti, J. Kariuki Chege, Anshuman Acharya, Raghunath Ghara, Sambit K. Giri, Ilian T. Iliev, Garrelt Mellema, Xin Zhang   +13 more
doaj   +1 more source