Publications

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1702 Publications visible to you, out of a total of 1702

Abstract (Expand)

The digitisation of historical documents, particularly those containing tabular data, is becoming increasingly critical for the preservation of information and analysis of long-term trends. However, this task presents significant challenges, particularly with semi-formal documents like handwritten records, which often need more consistent structure. This paper addresses the challenge of developing an automated approach for transcribing historical handwritten tables. Our presented method works on a mixture of computer vision tools and optical character recognition (OCR) to detect the grid and content of the table. The dataset we collected contains records from beekeepers, consisting of hive weight gain and loss and meteorological conditions. The Institute of Bee Protection at JKI gathered this information from the German beekeeper associations of Lower Saxony, Hesse, Mecklenburg-Vorpommern, Thuringia, and Brandenburg in Germany within the collaborative research project MonViA. This data is crucial for understanding the impact of climate change on bee vitality and contains daily information from each beekeeper over decades, holding valuable insights into past environmental conditions. The success rate of automatically transcribed hive scale data from Lower Saxony was compared with the accuracy of transcription done by human power. Our dataset of 14\,738 handwritten scans, out of which 3819 were manually digitised, provides a large ground truth for future research, paving the way for further exploration and uncovering other historical knowledge.

Authors: Lukrécia Mertová, Severin Polreich, Oleg Lewkovski, Wolfgang Müller

Date Published: 13th Mar 2025

Publication Type: InProceedings

Abstract

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Authors: André Victor Ribeiro Amaral, Daniel Wolffram, Paula Moraga, Johannes Bracher

Date Published: 3rd Mar 2025

Publication Type: Journal

Abstract (Expand)

In the third APOKASC catalog, we present data for the complete sample of 15,808 evolved stars with APOGEE spectroscopic parameters and Kepler asteroseismology. We used 10 independent asteroseismic analysis techniques and anchor our system on fundamental radii derived from Gaia L and spectroscopic Teff. We provide evolutionary state, asteroseismic surface gravity, mass, radius, age, and the data used to derive them for 12,418 stars. This includes 10,036 exceptionally precise measurements, with median fractional uncertainties in ν max, Δ ν, mass, radius, and age of 0.6%, 0.6%, 3.8%, 1.8%, and 11.1%, respectively. We provide more limited data for 1624 additional stars that either have lower-quality data or are outside of our primary calibration domain. Using lower red giant branch (RGB) stars, we find a median age for the chemical thick disk of 9.14 ± 0.05(ran) ± 0.9(sys) Gyr with an age dispersion of 1.1 Gyr, consistent with our error model. We calibrate our red clump (RC) mass loss to derive an age consistent with the lower RGB and provide asymptotic GB and RGB ages for luminous stars. We also find a sharp upper-age boundary in the chemical thin disk. We find that scaling relations are precise and accurate on the lower RGB and RC, but they become more model dependent for more luminous giants and break down at the tip of the RGB. We recommend the use of multiple methods, calibration to a fundamental scale, and the use of stellar models to interpret frequency spacings.

Authors: Marc H. Pinsonneault, Joel C. Zinn, Jamie Tayar, Aldo Serenelli, Rafael A. García, Savita Mathur, Mathieu Vrard, Yvonne P. Elsworth, Benoit Mosser, Dennis Stello, Keaton J. Bell, Lisa Bugnet, Enrico Corsaro, Patrick Gaulme, Saskia Hekker, Marc Hon, Daniel Huber, Thomas Kallinger, Kaili Cao, Jennifer A. Johnson, Bastien Liagre, Rachel A. Patton, Ângela R. G. Santos, Sarbani Basu, Paul G. Beck, Timothy C. Beers, William J. Chaplin, Katia Cunha, Peter M. Frinchaboy, Léo Girardi, Diego Godoy-Rivera, Jon A. Holtzman, Henrik Jönsson, Szabolcs Mészáros, Claudia Reyes, Hans-Walter Rix, Matthew Shetrone, Verne V. Smith, Taylor Spoo, Keivan G. Stassun, Ji Wang

Date Published: 5th Feb 2025

Publication Type: Journal

Abstract (Expand)

As part of the BioHackathon Europe 2024, we here report on the progress that both project 19 and project 24 have made during the event. For the purpose of this report we will present the abstract of abstract of both projects and then dive deeper on what work was done during the BioHackathon.

Authors: Sebastian Beier, Daniel Arend, Daniel Bauer, Marco Brandizi, Dominik Brilhaus, Eli Chadwick, Vera Clemens, Michael Robin Crusoe, Manuel Feser, Jonas Grieb, Xiaoming Hu, Abigail Miller, Timo Mühlhaus, Stuart Owen, Maja Rey, Gabriel Schneider, Julian Schneider, Kevin Schneider, Heinrich Lukas Weil, Florian Wetzels

Date Published: 2nd Feb 2025

Publication Type: Tech report

Abstract (Expand)

Hot Jupiters are gas giant planets with orbital periods of a few days and are found in 0.1–1% of Sun-like stars. They are expected to be engulfed during their host star’s radial expansion on the red giant branch, which may account for observed rapidly rotating and chemically enriched giant stars. We performed 3D hydrodynamical simulations of hot Jupiter engulfment by a 1 M⊙, 4 R⊙ early red giant. Our ‘global’ simulations simultaneously resolve the stellar envelope and planetary structure, modelling the hot Jupiter as a polytropic gas sphere. The hot Jupiter spirals in due to ram-pressure drag. A substantial fraction of its mass is continuously ablated in this process, although the mass-loss rate is resolution dependent. We estimate that this could enhance the surface lithium abundance by up to ≈0.1 dex. The hot Jupiter is disrupted by a combination of ram pressure and tidal forces near the base of the convective envelope, with the deepest material penetrating to the radiative zone. The star experiences modest spin-up (∼1 km s−1), and engulfing a more massive companion may be required to produce a rapidly rotating giant. Drag heating near the surface and hydrogen recombination in the small amount of unbound ejecta recorded in the simulation could power an optical transient, although this needs to be confirmed by a calculation that has adequate resolution at the stellar surface.

Authors: Mike Y. M. Lau, Matteo Cantiello, Adam S. Jermyn, Morgan MacLeod, Ilya Mandel, Daniel J. Price

Date Published: 1st Feb 2025

Publication Type: Journal

Abstract

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Editor:

Date Published: 31st Jan 2025

Publication Type: Master's Thesis

Abstract

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Authors: Parameswaran Ajith, Pau Amaro Seoane, Manuel Arca Sedda, Riccardo Arcodia, Francesca Badaracco, Biswajit Banerjee, Enis Belgacem, Giovanni Benetti, Stefano Benetti, Alexey Bobrick, Alessandro Bonforte, Elisa Bortolas, Valentina Braito, Marica Branchesi, Adam Burrows, Enrico Cappellaro, Roberto Della Ceca, Chandrachur Chakraborty, Shreevathsa Chalathadka Subrahmanya, Michael W. Coughlin, Stefano Covino, Andrea Derdzinski, Aayushi Doshi, Maurizio Falanga, Stefano Foffa, Alessia Franchini, Alessandro Frigeri, Yoshifumi Futaana, Oliver Gerberding, Kiranjyot Gill, Matteo Di Giovanni, Ines Francesca Giudice, Margherita Giustini, Philipp Gläser, Jan Harms, Joris van Heijningen, Francesco Iacovelli, Bradley J. Kavanagh, Taichi Kawamura, Arun Kenath, Elisabeth-Adelheid Keppler, Chiaki Kobayashi, Goro Komatsu, Valeriya Korol, N. V. Krishnendu, Prayush Kumar, Francesco Longo, Michele Maggiore, Michele Mancarella, Andrea Maselli, Alessandra Mastrobuono-Battisti, Francesco Mazzarini, Andrea Melandri, Daniele Melini, Sabrina Menina, Giovanni Miniutti, Deeshani Mitra, Javier Morán-Fraile, Suvodip Mukherjee, Niccolò Muttoni, Marco Olivieri, Francesca Onori, Maria Alessandra Papa, Ferdinando Patat, Andrea Perali, Tsvi Piran, Silvia Piranomonte, Alberto Roper Pol, Masroor C. Pookkillath, R. Prasad, Vaishak Prasad, Alessandra De Rosa, Sourav Roy Chowdhury, Roberto Serafinelli, Alberto Sesana, Paola Severgnini, Angela Stallone, Jacopo Tissino, Hrvoje Tkalčić, Lina Tomasella, Martina Toscani, David Vartanyan, Cristian Vignali, Lucia Zaccarelli, Morgane Zeoli, Luciano Zuccarello

Date Published: 28th Jan 2025

Publication Type: Journal

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