cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamics of the photosphere along the solar cycle from SDO/HMI
Creators: name: Roudier, Th.
name: Malherbe, J. M.
name: Mirouh, G. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: As the global magnetic field of the Sun has an activity cycle, one expects to observe some variation of the dynamical properties of the flows visible in the photosphere. We investigate the flow field during the solar cycle by analysing SDO/HMI observations of continuum intensity, Doppler velocity and longitudinal magnetic field. We first picked data at disk center during 6 years along the solar cycle with a 48-hour time step in order to study the overall evolution of the continuum intensity and magnetic field. Then we focused on thirty 6-hour sequences of quiet regions without any remnant of magnetic activity separated by 6 months, in summer and winter, when disk center latitude B0 is close to zero. The horizontal velocity was derived from the local correlation tracking technique over a field of view of 216.4Mm x 216.4Mm located at disk center. Our measurements at disk center show the stability of the flow properties between meso- and supergranular scales along the solar cycle. The network magnetic field, produced locally at disk center independently from large scale dynamo, together with continuum contrast, vertical and horizontal flows, seem to remain constant during the solar cycle.
description: 7 pages, 14 figures
Light and colour of cirrus, translucent and opaque dust in the high-latitude area of LDN 1642
Creators: name: Mattila, K.
name: Väisänen, P.
name: Lehtinen, K.
name: Haikala, L.
name: Haas, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have performed a 5-colour surface photometric study of the high-galactic-latitude area of dark nebula LDN 1642. Scattered light properties are presented of diffuse, translucent and opaque dust over the range of 3500 -- 5500 A. Far infrared absolute photometry at 200 um improves the precision of and provides a zero point to the extinction. The intensity of the scattered light depends on dust column density in a characteristic way: for optically thin dust the intensity first increases linearly, then turns to a saturation value; at still larger extinctions the intensity turns down to a slow decrease. The $A_V$ value of the saturated intensity maximum shifts in a systematic way, from $A_V\approx$ 1.5 mag at 3500 A, to $\sim 3$ mag at 5500 A. The intensity curves offer a straight-forward explanation for the behaviour of the scattered-light colours. At the intensity peak the colour agrees with the integrated starlight colour, while it is bluer at the low- and redder at the high-column-density side of the peak, respectively. These colour changes are a direct consequence of the wavelength dependence of the extinction. We have compared the colours of the LDN 1642 area with other relevant observational studies: high-latitude diffuse/translucent clouds, wide-field cirrus dust; and externally illuminated AGB-star envelopes. For extragalactic low-surface-brightness sources cirrus is an unwanted foreground contaminant. Our results for cirrus colours can help to distinguish cases where a diffuse plume or stream, apparently associated with a galaxy or a group or cluster, is more likely a local cirrus structure. Keywords: ISM: dust, extinction -- ISM: clouds, individual LDN 1642 -- Galaxy: solar neighbourhood -- Astronomical instruments, methods and techniques: methods -- Physical data and processes: scattering
description: 20 pages, 10 figures, accepted for publication in MNRAS, published as MNRAS advance article on June 27 2023
Remarkable analytic relations among greybody parameters
Creators: name: Elia, Davide
name: Pezzuto, Stefano
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we derive and discuss several implications of the analytic form of a modified blackbody, also called greybody, which is widely used in Astrophysics, and in particular in the study of star formation in the far-infrared/sub-millimeter domain. The research in this area has been greatly improved thanks to recent observations taken with the Herschel satellite, so that it became important to clarify the sense of the greybody approximation, to suggest possible further uses, and to delimi its intervals of validity. First, we discuss the position of the greybody peak, making difference between the optically thin and thick regimes. Second, we analyze the behavior of bolometric quantities as a function of the different greybody parameters. The ratio between the bolometric luminosity and the mass of a source, the ratio between the so-called "sub-millimeter luminosity" and the bolometric one, and the bolometric temperature are observables used to characterize the evolutionary stage of a source, and it is of primary importance to have analytic equations describing the dependence of such quantities on the greybody parameters. Here we discuss all these aspects, providing analytic relations, illustrating particular cases and providing graphical examples. Some equations reported here are well-known in Astrophysics, but are often spread over different publications. Some of them, instead, are brand new and represent a novelty in Astrophysics literature. Finally we indicate an alternative way to obtain, under some conditions, the greybody temperature and dust emissivity directly from an observing spectral energy distribution, avoiding a best-fit procedure.
description: accepted by MNRAS
StarUnLink: identifying and mitigating signals from communications satellites in stellar spectral surveys
Creators: name: Bialek, Spencer
name: Lucatello, Sara
name: Fabbro, Sebastien
name: Yi, Kwang Moo
name: Venn, Kim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A relatively new concern for the forthcoming massive spectroscopic sky surveys is the impact of contamination from low earth orbit satellites. Several hundred thousand of these satellites are licensed for launch in the next few years and it has been estimated that, in some cases, up to a few percent of spectra could be contaminated when using wide field, multi-fiber spectrographs. In this paper, a multi-staged approach is used to assess the practicality and limitations of identifying and minimizing the impact of satellite contamination in a WEAVE-like stellar spectral survey. We develop a series of convolutional-network based architectures to attempt identification, stellar parameter and chemical abundances recovery, and source separation of stellar spectra that we artificially contaminate with satellite (i.e. solar-like) spectra. Our results show that we are able to flag 67% of all contaminated sources at a precision level of 80% for low-resolution spectra and 96% for high-resolution spectra. Additionally, we are able to remove the contamination from the spectra and recover the clean spectra with a $<$1% reconstruction error. The errors in stellar parameter predictions reduce by up to a factor of 2-3 when either including contamination as an augmentation to a training set or by removing the contamination from the spectra, with overall better performance in the former case. The presented methods illustrate several machine learning mitigation strategies that can be implemented to improve stellar parameters for contaminated spectra in the WEAVE stellar spectroscopic survey and others like it.
description: 15 pages. To be published in MNRAS
Measuring Altmetric Events: The Impact of Longer Observation Period and Article Level Computations
Creators: name: Karmakar, Mousumi
name: Banshal, Sumit Kumar
name: Singh, Vivek Kumar
Publisher: name: Zenodo
Year: 2022

description: Altmetric events around scholarly articles are now being monitored and measured for various purposes. Several studies have shown that altmetric data correlate well with citations and hence early altmetric counts can be used to predict future citations. Inspired by these findings, majority of such monitoring and measuring exercises have focused mainly on capturing immediate altmetric event data for articles just after the publication of the article. Measures like altmetric half-life have been proposed analogous to the definition of citation half-life. This article primarily explores what impact the data observation period may have on such computations. Further, it also attempts to find out whether article-level computations are better than computations on the whole of the data for computing such measures. The results obtained show that use of longer observation period significantly changes the values of different measures computed. Further, use of article-level delineation is advocated for computing different measures for a more accurate representation of the true values for the article distribution.
Self-avoiding walks contained within a square
Creators: name: Guttmann, Anthony J
name: Jensen, Iwan
name: Owczarek, Aleksander L
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have studied self-avoiding walks contained within an $L \times L$ square whose end-points can lie anywhere within, or on, the boundaries of the square. We prove that such walks behave, asymptotically, as walks crossing a square (WCAS), being those walks whose end-points lie at the south-east and north-west corners of the square. We provide numerical data, enumerating all such walks, and analyse the sequence of coefficients in order to estimate the asymptotic behaviour. We also studied a subset of these walks, those that must contain at least one edge on all four boundaries of the square. We provide compelling evidence that these two classes of walks grow identically. From our analysis we conjecture that the number of such walks $C_L$, for both problems, behaves as $$ C_L \sim λ^{L^2+bL+c}\cdot L^g,$$ where $λ= 1.7445498 \pm 0.0000012,$ $b=-0.04354 \pm 0.0005,$ $c=-1.35 \pm 0.45,$ and $g=3.9 \pm 0.1.$ Finally, we also studied the equivalent problem for self-avoiding polygons, also known as cycles in a square grid. The asymptotic behaviour of cycles has the same form as walks, but with different values of the parameters $c$, and $g$. Our numerical analysis shows that $λ$ and $b$ have the same values as for WCAS and that $c=1.776 \pm 0.002$ while $g=-0.500\pm 0.005$ and hence probably equals $-\frac12$.
description: 17 pages, 11 figures
Towards Suicide Prevention from Bipolar Disorder with Temporal Symptom-Aware Multitask Learning
Creators: name: Lee, Daeun
name: Son, Sejung
name: Jeon, Hyolim
name: Kim, Seungbae
name: Han, Jinyoung
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Bipolar disorder (BD) is closely associated with an increased risk of suicide. However, while the prior work has revealed valuable insight into understanding the behavior of BD patients on social media, little attention has been paid to developing a model that can predict the future suicidality of a BD patient. Therefore, this study proposes a multi-task learning model for predicting the future suicidality of BD patients by jointly learning current symptoms. We build a novel BD dataset clinically validated by psychiatrists, including 14 years of posts on bipolar-related subreddits written by 818 BD patients, along with the annotations of future suicidality and BD symptoms. We also suggest a temporal symptom-aware attention mechanism to determine which symptoms are the most influential for predicting future suicidality over time through a sequence of BD posts. Our experiments demonstrate that the proposed model outperforms the state-of-the-art models in both BD symptom identification and future suicidality prediction tasks. In addition, the proposed temporal symptom-aware attention provides interpretable attention weights, helping clinicians to apprehend BD patients more comprehensively and to provide timely intervention by tracking mental state progression.
description: KDD 2023 accepted
Direct Imaging Discovery of a Jovian Exoplanet Within a Triple Star System
Creators: name: Wagner, Kevin
name: Apai, Dániel
name: Kasper, Markus
name: Kratter, Kaitlin
name: McClure, Melissa
name: Robberto, Massimo
name: Beuzit, Jean-Luc
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Direct imaging allows for the detection and characterization of exoplanets via their thermal emission. We report the discovery via imaging of a young Jovian planet in a triple star system and characterize its atmospheric properties through near-infrared spectroscopy. The semi-major axis of the planet is closer relative to that of its hierarchical triple star system than for any known exoplanet within a stellar binary or triple, making HD 131399 dynamically unlike any other known system. The location of HD 131399Ab on a wide orbit in a triple system demonstrates that massive planets may be found on long and possibly unstable orbits in multi-star systems. HD 131399Ab is one of the lowest mass (4+/-1 MJup) and coldest (850+/-50 K) exoplanets to have been directly imaged.
Eine Einführung in das Thema Informationsbudget – was bisher geschah
Creators: name: Schirrwagen, Jochen
Publisher: name: Zenodo
Year: 2023
Subjects: Open Access
Finanzierung
Informationsbudget
open-access.network

description: Präsentation für den Online-Workshop "Finanzierungsströme für die Open-Access-Transformation – Überblick und Stand der Diskussion" am 13.09.2023, veranstaltet vom BMBF-Projekt open-access.network
Fermionic topological quantum states as tensor networks
Creators: name: Wille, C.
name: Buerschaper, O.
name: Eisert, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Tensor network states, and in particular projected entangled pair states, play an important role in the description of strongly correlated quantum lattice systems. They do not only serve as variational states in numerical simulation methods, but also provide a framework for classifying phases of quantum matter and capture notions of topological order in a stringent and rigorous language. The rapid development in this field for spin models and bosonic systems has not yet been mirrored by an analogous development for fermionic models. In this work, we introduce a framework of tensor networks having a fermionic component capable of capturing notions of topological order. At the heart of the formalism are axioms of fermionic matrix product operator injectivity, stable under concatenation. Building upon that, we formulate a Grassmann number tensor network ansatz for the ground state of fermionic twisted quantum double models. A specific focus is put on the paradigmatic example of the fermionic toric code. This work shows that the program of describing topologically ordered systems using tensor networks carries over to fermionic models.
description: 7+2 pages, 9 figures
Holocentrus adscensionis
Creators: name: Triay-Portella, Raül
name: Pajuelo, José G.
name: Manent, Pablo
name: Espino, Fernando
name: Ruiz-Díaz, Raquel
name: Lorenzo, José M.
name: González, José A.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Beryciformes
Holocentridae
Holocentrus
Holocentrus adscensionis

description: Holocentrus adscensionis (Osbeck, 1765), squirrelfish
 Material examined. – ICCM399, one resting male, 219 mm TL, 167 mm SL, off La Laja Beach, 28°03’N 15°25’W, 15–24 m, 15 Feb. 2015, rocks with sand (Fig. 2A).
 Sightings and catches. – Once, n = 1, same locality (Fig. 3).
 Remarks. – A tropical and subtropical reef-associated species, living from the shoreline to 180 m of depth (Smith, 1997), usually at 8-30 m (Wyatt, 1983). It occurs in shallow coral reefs as well as deeper offshore waters (Woods and Greenfield, 1978). A nocturnal species, hiding in deep crevices or under coral ledges during the day; at night, it usually moves over sand and seagrass beds, taking mainly crabs and other small crustaceans (Greenfield, 1981). Maximum length published is 610 mm TL. An amphi-Atlantic species. In the West Atlantic, it ranges from North Carolina, USA and Bermuda to Brazil (Woods and Greenfield, 1978; Robins and Ray, 1986; Greenfield, 2003). In the mid-Atlantic: St. Paul’s Rocks, Ascension and St. Helena Islands (Wirtz et al., 2007). In the East Atlantic, it is known from Annobón Island (Wirtz et al., 2007) and São Tomé Island (Osório, 1898; Afonso et al., 1999; Wirtz et al., 2007), and from Gabon to Angola (Greenfield, 1981); absent from the Cape Verde Islands (Wirtz et al., 2013; Hanel and John, 2015).
 H. adscensionis was first reported from the Canaries by Castro-Hernández and Martín-Gutiérrez (2000) based on one individual caught off Castillo del Romeral, south-eastern coast of Gran Canaria. Brito et al. (2002) reported on a total of nine individuals all collected at the eastern coast of Gran Canaria. One more individual was sighted and photographed alive off Punta de La Sal, eastern coast of Gran Canaria (Espino et al., 2014). Another individual (220 mm TL, 168 mm SL) caught at the Port of Santa Cruz de Tenerife (rocky breakwater, 20-30 m) in October 2014 was identified by the second author and deposited as a museum voucher (TFMCBM-VP/1949).
description: Published as part of Triay-Portella, Raül, Pajuelo, José G., Manent, Pablo, Espino, Fernando, Ruiz-Díaz, Raquel, Lorenzo, José M. & González, José A., 2015, New records of non-indigenous fishes (Perciformes and Tetraodontiformes) from the Canary Islands (north-eastern Atlantic), pp. 163-174 in Cybium 39 (3) on page 165, DOI: 10.26028/cybium/2015-393-001, http://zenodo.org/record/13613589
Early Planet Formation in Embedded Disks (eDisk). II. Limited Dust Settling and Prominent Snow Surfaces in the Edge-on Class I Disk IRAS 04302+2247
Creators: name: Lin, Zhe-Yu Daniel
name: Li, Zhi-Yun
name: Tobin, John J.
name: Ohashi, Nagayoshi
name: Jørgensen, Jes Kristian
name: Looney, Leslie W.
name: Aso, Yusuke
name: Takakuwa, Shigehisa
name: Aikawa, Yuri
name: Hoff, Merel L. R. van 't
name: de Gregorio-Monsalvo, Itziar
name: Encalada, Frankie J.
name: Flores, Christian
name: Gavino, Sacha
name: Han, Ilseung
name: Kido, Miyu
name: Koch, Patrick M.
name: Kwon, Woojin
name: Lai, Shih-Ping
name: Lee, Chang Won
name: Lee, Jeong-Eun
name: Phuong, Nguyen Thi
name: Sai, Jinshi
name: Sharma, Rajeeb
name: Sheehan, Patrick
name: Thieme, Travis J.
name: Williams, Jonathan P.
name: Yamato, Yoshihide
name: Yen, Hsi-Wei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: While dust disks around optically visible, Class II protostars are found to be vertically thin, when and how dust settles to the midplane are unclear. As part of the Atacama Large Millimeter/submillimeter Array (ALMA) large program, Early Planet Formation in Embedded Disks, we analyze the edge-on, embedded, Class I protostar IRAS 04302+2247, also nicknamed the ``Butterfly Star." With a resolution of 0.05" (8~au), the 1.3 mm continuum shows an asymmetry along the minor axis which is evidence of an optically thick and geometrically thick disk viewed nearly edge-on. There is no evidence of rings and gaps, which could be due to the lack of radial substructure or the highly inclined and optically thick view. With 0.1" (16~au) resolution, we resolve the 2D snow surfaces, i.e., the boundary region between freeze-out and sublimation, for $^{12}$CO $J$=2--1, $^{13}$CO $J$=2--1, C$^{18}$O $J$=2--1, $H_{2}$CO $J$=$3_{0,3}$--$2_{0,2}$, and SO $J$=$6_{5}$--$5_{4}$, and constrain the CO midplane snow line to $\sim 130$ au. We find Keplerian rotation around a protostar of $1.6 \pm 0.4 M_{\odot}$ using C$^{18}$O. Through forward ray-tracing using RADMC-3D, we find that the dust scale height is $\sim 6$ au at a radius of 100~au from the central star and is comparable to the gas pressure scale height. The results suggest that the dust of this Class~I source has yet to vertically settle significantly.
description: 33 pages, 21 figures. Accepted for publication in ApJ as one of the first-look papers of the eDisk ALMA Large Program
Ternary Semiconductors NiZrSn and CoZrBi with half-Heusler structure: a first-principles study
Creators: name: Fiedler, Gregor
name: Kratzer, Peter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The ternary semiconductors NiZrSn and CoZrBi with C1_b crystal structure are introduced by calculating their basic structural, electronic and phononic properties using density functional theory. Both the gradient-corrected PBE functional and the hybrid functional HSE06 are employed. While NiZrSn is found to be a small-band-gap semiconductor (E_g = 0.46 eV in PBE and 0.60 eV in HSE06), CoZrBi has a band gap of 1.01 eV in PBE (1.34 eV in HSE06). Moreover, effective masses and deformation potentials are reported. In both materials ABC, the intrinsic point defects introduced by species A (Ni or Co) are calculated. The Co-induced defects in CoZrBi are found to have a higher formation energy compared to Ni-induced defects in NiZrSn. The interstitial Ni atom (Ni_i ) as well as the V_Ni Ni_i complex introduce defect states in the band gap, whereas the Ni vacancy (V_Ni) only reduces the size of the band gap. Motivated by the reported use of NiZrSn for thermoelectric applications, the Seebeck coefficient of both materials is calculated. We find that CoZrBi displays a rather large thermopower of up to 500 micro-V/K when p-doped, whereas NiZrSn possesses its maximum thermopower in the n-type regime. The reported difficulties in achieving p-type doping in NiZrSn could be rationalized by the unintended formation of Ni_i^2+ in conjunction with extrinsic acceptors, resulting in their compensation. Moreover, it is found that all types of defects considered, when present in concentrations as large as 3%, tend to reduce the thermopower compared to ideal bulk crystals at T=600K. For NiZrSn, the calculated thermodynamic data suggest that additional Ni impurities could be removed by annealing, leading to precipitation of a metallic Ni_2ZrSn phase.
description: 11 pages, 10 figures
Strategic Aspects of the Open Access Transformation
Creators: name: Meijer, Gerard
Publisher: name: Zenodo
Year: 2023
Subjects: Open Access
Finanzierung
Informationsbudget
open-access.network

description: Präsentation für den Online-Workshop "Finanzierungsströme für die Open-Access-Transformation – Überblick und Stand der Diskussion" am 13.09.2023, veranstaltet vom BMBF-Projekt open-access.network
MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112
Creators: name: Rodigas, Timothy J.
name: Bergeron, P.
name: Simon, Amelie
name: Arriagada, Pamela
name: Faherty, Jackie
name: Anglada-Escude, Guillem
name: Mamajek, Eric E.
name: Weinberger, Alycia
name: Butler, R. Paul
name: Males, Jared R.
name: Morzinski, Katie
name: Close, Laird M.
name: Hinz, Philip M.
name: Bailey, Jeremy
name: Carter, Brad
name: Jenkins, James S.
name: Jones, Hugh
name: O'Toole, Simon
name: Tinney, C. G.
name: Wittenmyer, Rob
name: Debes, John
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source responsible for the trend using the Magellan Adaptive Optics system. We detect the object (HD 11112B) at a separation of 2\fasec 2 (100 AU) at multiple wavelengths spanning 0.6-4 \microns ~and show that it is most likely a gravitationally-bound cool white dwarf. Modeling its spectral energy distribution (SED) suggests that its mass is 0.9-1.1 \msun, which corresponds to very high-eccentricity, near edge-on orbits from Markov chain Monte Carlo analysis of the RV and imaging data together. The total age of the white dwarf is $>2σ$ discrepant with that of the primary star under most assumptions. The problem can be resolved if the white dwarf progenitor was initially a double white dwarf binary that then merged into the observed high-mass white dwarf. HD 11112B is a unique and intriguing benchmark object that can be used to calibrate atmospheric and evolutionary models of cool white dwarfs and should thus continue to be monitored by RV and direct imaging over the coming years.
description: Accepted to ApJ on September 8, 2016. 13 pages aastex6 2-column format. Comments welcome
Shining Light on Cosmogenic Axions with Neutrino Experiments
Creators: name: Cui, Yanou
name: Kuo, Jui-Lin
name: Pradler, Josef
name: Tsai, Yu-Dai
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: While most searches for cosmic axions so far focused on their cold relics as (a component of) dark matter, various well-motivated cosmological sources can produce "boosted" axions that remain relativistic today. We demonstrate that existing/upcoming neutrino experiments such as Super-Kamiokande, Hyper-Kamiokande, DUNE, JUNO, and IceCube can probe such energetic axion relics. The characteristic signature is the mono-energetic single photon signal from axion absorption induced by the axion-photon coupling. This proposal offers to cover parameter ranges that are complementary to existing axion searches and provides new opportunities for discovery with neutrino facilities.
description: Minor revisions, references added (8 pages, 3 figures)
A method for probing the formation of quark matter
Creators: name: Yong, Gao-Chan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Based on a multi-phase transport model for relativistic heavy-ion collisions, effects of the parton scatterings on the production of strangeness in relativistic heavy-ion collisions are studied. It is found that the distributions of strange quark and strange baryon, especially for the double strangeness $Ξ^{-}$, are significantly affected by the parton scatterings in heavy-ion collisions below $\sqrt{s_{NN}}\sim$ 10 GeV. Given parton scatterings as a signal of the formation of quark matter, the transverse momentum distribution of the ratio of single and double strangeness $(Λ+Σ^{0})/Ξ^{-}$ produced in heavy-ion collisions may serve as a potential probe of the emergence of quark matter, or equivalently, the occurrence of hadron-quark phase transition in relativistic heavy-ion collisions.
description: 5 pages, 5 figures, Physics Letters B, in production
Women in Health Sciences research: a snapshot of the current situation
Creators: name: Sixto-Costoya, Andrea
name: Lucas-Domínguez, Rut
name: Alonso-Arroyo, Adolfo
name: Yiming, Liu
name: Valderrama-Zurián, Juan Carlos
Publisher: name: Zenodo
Year: 2022

description: The first conclusion of our work is that there is still work to be done to achieve equality in research in the area of Health Sciences in Spanish institutions. Articles signed by more men than women continue to be the majority both in terms of the number of publications and the number of international collaborations. However, we note that, when specific other variables such as publication in OA or funding received are analyzed, the papers where women are the majority or where there are only women signatories are even higher than men when compared with their own group. This indicates that women, when they manage to get there, are even more active at least in terms of funding and open publication.
Auf dem Weg zum Informationsbudget: Erfahrungen aus dem Forschungszentrum Jülich
Creators: name: Mittermaier, Bernhard
Publisher: name: Zenodo
Year: 2023
Subjects: Open Access
Finanzierung
Informationsbudget
open-access.network

description: Präsentation für den Online-Workshop "Finanzierungsströme für die Open-Access-Transformation – Überblick und Stand der Diskussion" am 13.09.2023, veranstaltet vom BMBF-Projekt open-access.network
Glueball Dark Matter revisited
Creators: name: Carenza, Pierluca
name: Pasechnik, Roman
name: Salinas, Gustavo
name: Wang, Zhi-Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the possibility that Dark Matter is composed of stable scalar glueballs of a confining dark ${\rm SU}(3)$ gauge theory coupled only to gravity. The relic abundance of dark glueballs is studied for the first time in a thermal effective theory accounting for strong-coupling dynamics. An important ingredient of our analysis is the use of an effective potential for glueballs that is fitted by lattice simulations. We predict the relic abundance to be in the range $0.12ζ_{T}^{-3}Λ/(137.9 {\rm eV}) \lesssim Ωh^{2}\lesssim 0.12ζ_{T}^{-3}Λ/(82.7 {\rm eV})$, with $Λ$ being the confinement scale, $ζ_{T}$ the visible-to-dark sector temperature ratio and the uncertainty is coming from the fit to lattice data. This prediction is an order of magnitude smaller than the existing glueball abundance results in the literature. Our framework can be easily generalised to different gauge groups and modified cosmological histories paving the way towards consistent exploration of strongly-coupled dark sectors and their cosmological implications.
description: v2: 7 pages, 2 figures
Optically stimulated electron paramagnetic resonance: simplicity, versatility, information content
Creators: name: Kozlov, V. O.
name: Fomin, A. A.
name: Ryzhov, I. I.
name: Kozlov, G. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A simple technique for observing optically stimulated electron paramagnetic resonance (OSEPR) is proposed and investigated. The versatility and information content of the described technique is demonstrated by the example of the OSEPR spectra of systems that are unpopular for this type of spectroscopy: a crystal with rare-earth ions Nd$^{3+}$ and a doped semiconductor GaAs. In addition, the OSEPR spectrum of atomic cesium is presented, in which an optical nonlinearity is observed that makes it possible to estimate the Rabi frequency for the relevant optical transition. The effects observed in the described experiments (switching of peaks to dips, light-induced splitting of the OSEPR lines, and the appearance of a spectral feature at the double-Larmor frequency) are interpreted using the model proposed in the theoretical part of the work. The suggested interpretation shows the possibility of using the described OSEPR technique to estimate not only `magnetic' parameters of the model Hamiltonian (g-factors, spin relaxation times), but also the Rabi frequencies characterizing optical transitions.
Applying wavelet analysis to the X-ray light curves of active galactic nuclei and quasi-periodic eruptions
Creators: name: Ghosh, Akshay
name: Gallo, L. C.
name: Gonzalez, A. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this work, we examine the application of the wavelet transform to the X-ray timing analyses of active galactic nuclei (AGN) and quasi-periodic eruption sources (QPEs). Several scenarios are simulated to test the effectiveness of the wavelet analysis to stationary and non-stationary data. We find that the power spectral density (PSD) slope and the nature of the periodic signal can influence the ability to identify important features in the wavelet power spectrum. In general, weak and transient features can be discerned, which make the wavelet spectrum an important tool in examining AGN light curves. We carried out a wavelet analysis to four unique objects: Ark 120, IRAS 13224-3809, RE J1034+396, and the QPE GSN 069. The well-known quasi-periodic oscillation (QPO) in RE J1034+396 is significantly detected in the wavelet power spectrum. In IRAS 13224-3809, significant transient features appear during a flare at frequencies coincident with previously detected reverberation signals. Finally, the wavelet power spectrum of the QPE GSN 069 significantly reveals four persistent signals that exhibit a 3:2 ratio in oscillation frequencies, consistent with high-frequency QPOs in stellar mass X-ray binaries, but we cannot rule out the possibility this is an artefact of the calculation.
description: 14 pages, 14 figures, Accepted for publication to MNRAS
Meta-analysis of studies on Twitter users disseminating scholarly publications
Creators: name: Maleki, Ashraf
name: Holmberg, Kim
Publisher: name: Zenodo
Year: 2022

description: The current study took a meta-analytical approach to summarize the results from earlier studies that had attempted to answer the question about who is tweeting scientific content. The methodological challenges of our approach stemmed from the earlier studies using different data and somewhat different categorizations. Our results demonstrate the importance of individuals, and in particular individual academics, in the dissemination of scientific articles on Twitter. Our results also highlight the need for a more structured and unified categorization, as a significant proportion of the results in earlier studies have been unclear.
Classification of the \emph{Fermi}-LAT Blazar Candidates of Uncertain type using eXtreme Gradient Boosting
Creators: name: Tolamatti, A.
name: Singh, K. K.
name: Yadav, K. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Machine learning based approaches are emerging as very powerful tools for many applications including source classification in astrophysics research due to the availability of huge high quality data from different surveys in observational astronomy. The Large Area Telescope on board \emph{Fermi} satellite (\emph{Fermi}-LAT) has discovered more than 6500 high energy gamma-ray sources in the sky from its survey over a decade. A significant fraction of sources observed by the \emph{Fermi}-LAT either remains unassociated or has been identified as \emph{Blazar Candidates of Uncertain type} (BCUs). We explore the potential of eXtreme Gradient Boosting (XGBoost)- a supervised machine learning algorithm to identify the blazar subclasses among a sample of 112 BCUs of the 4FGL catalog whose X-ray counterparts are available within 95$\%$ uncertainty regions of the \emph{Fermi}-LAT observations. We have used information from the multi-wavelength observations in IR, optical, UV, X-ray and $γ$-ray wavebands along with the redshift measurements reported in the literature for classification. Among the 112 uncertain type blazars, 62 are classified as BL Lacertae objects (BL Lacs) and 6 have been classified as Flat Spectrum Radio Quasars (FSRQs). This indicates a significant improvement with respect to the multi-perceptron neural network based classification reported in the literature. Our study suggests that the gamma-ray spectral index, and IR color indices are the most important features for identifying the blazar subclasses using the \emph{XGBoost} classifier. We also explore the importance of redshift in the classification BCU candidates.
description: 16 Pages, 10 Figures, Accepted for Publication in MNRAS
DAPA-HF applicability: the point of view of a cardiology setting
Creators: name: Iacoviello, Massimo
name: Marini, Marco
name: Gori, Mauro
name: Orso, Francesco
name: Gonzini, Lucio
name: Gorini, Marco
name: Fenici, Peter
name: Maggioni, Aldo Pietro
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Pharmacology
subject: Immunology
subject: FOS: Clinical medicine
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Randomised clinical trials, observational studies, and meta-analyses have shown that sodium–glucose cotransporter 2 inhibitors (SGLT2-i) reduce the risk of hospitalisation for heart failure (HF), chronic kidney disease (CKD) progression, and mortality in patients with HF, irrespective of the presence of type 2 diabetes mellitus. However, real-world epidemiology may differ from clinical trial populations, thereby limiting generalisability and delaying the introduction of novel treatments in clinical practice. The aim of the present study was to assess the prevalence of DAPA-HF (Dapagliflozin and Prevention of Adverse Outcomes in Heart Failure) inclusion criteria in a population of HF with reduced ejection fraction (HFrEF) patients enrolled in the Italian Network on Heart Failure (IN-HF) registry. Overall, 3415 IN-HF patients matched the 4744 patients in DAPA-HF, overlapping for most baseline characteristics (e.g. similar average ejection fraction), with a slightly lower prevalence of type 2 diabetes and of HF ischaemic aetiology and a higher percentage of NYHA class II patients. The theoretical eligibility to DAPA-HF in a cardiology setting resulted to be 73%. The availability of an easily accessible database from a large nationwide prospective registry allows to provide insights to clinicians and policy makers on the applicability of the DAPA HF findings to a contemporary population of HFrEF patients followed by cardiologists. It is reasonable to assume that the results of this analysis can be applicable to the entire SGLT2-ir class of drugs.
Cephalopholis taeniops
Creators: name: Triay-Portella, Raül
name: Pajuelo, José G.
name: Manent, Pablo
name: Espino, Fernando
name: Ruiz-Díaz, Raquel
name: Lorenzo, José M.
name: González, José A.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Perciformes
Serranidae
Cephalopholis
Cephalopholis taeniops

description: Cephalopholis taeniops (Valenciennes, 1828), African hind or blue-spotted seabass
 Material examined. – ICCM404, one resting male, 390 mm TL, 325 mm SL, off Baja de Melenara (Melenara reef), 27°59’N 15°22’W, 15-24 m, 15 Oct. 2014, rocks with sand (Fig. 2B).
 Sightings and catches. – Twice, n = 3: Melenara reef, 15-24 m, rocks with sand; off the Port of Agaete, 28°06’N 15°42’W, 20-30 m, rocks with sand (Fig. 3).
 Remarks. – A demersal species, found on shallow tropical rocky reefs and sandy bottoms up to 200 m depth in the eastern Atlantic from the Western Sahara to Angola, including Cape Verde and São Tomé and Príncipe Islands (Rocha et al., 2008; Craig et al., 2011; Tariche et al., 2014). This is a large-sized carnivorous species (Tariche 2002; Brito et al., 2011). Maximum length published is 700 mm TL.
 C. taeniops was first reported from the Canaries by Brito et al. (2011) based on one individual caught at the Port of Las Palmas.
description: Published as part of Triay-Portella, Raül, Pajuelo, José G., Manent, Pablo, Espino, Fernando, Ruiz-Díaz, Raquel, Lorenzo, José M. & González, José A., 2015, New records of non-indigenous fishes (Perciformes and Tetraodontiformes) from the Canary Islands (north-eastern Atlantic), pp. 163-174 in Cybium 39 (3) on page 165, DOI: 10.26028/cybium/2015-393-001, http://zenodo.org/record/13613589
Fast and Efficient Stochastic Optimization for Analytic Continuation
Creators: name: Bao, F.
name: Tang, Y.
name: Summers, M.
name: Zhang, G.
name: Webster, C.
name: Scarola, V.
name: Maier, T. A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The analytic continuation of imaginary-time quantum Monte Carlo data to extract real-frequency spectra remains a key problem in connecting theory with experiment. Here we present a fast and efficient stochastic optimization method (FESOM) as a more accessible variant of the stochastic optimization method introduced by Mishchenko et al. and benchmark the resulting spectra with those obtained by the standard Maximum Entropy method for three representative test cases, in- cluding data taken from studies of the two-dimensional Hubbard model. We generally find that our FESOM approach gives spectra similar to the Maximum Entropy results. In particular, while the Maximum Entropy method gives superior results when the quality of the data is strong, we find that FESOM is able to resolve fine structure with more detail when the quality of the data is poor. In addition, because of its stochastic nature, the method provides detailed information on the frequency dependent uncertainty of the resulting spectra, while the Maximum Entropy method does so only for the spectral weight integrated over a finite frequency region. We therefore believe that this variant of the stochastic optimization approach provides a viable alternative to the routinely used Maximum Entropy method especially for data with poor quality.
description: 11 pages, 7 figures
Rethinking Degradation: Radiograph Super-Resolution via AID-SRGAN
Creators: name: Huang, Yongsong
name: Wang, Qingzhong
name: Omachi, Shinichiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we present a medical AttentIon Denoising Super Resolution Generative Adversarial Network (AID-SRGAN) for diographic image super-resolution. First, we present a medical practical degradation model that considers various degradation factors beyond downsampling. To the best of our knowledge, this is the first composite degradation model proposed for radiographic images. Furthermore, we propose AID-SRGAN, which can simultaneously denoise and generate high-resolution (HR) radiographs. In this model, we introduce an attention mechanism into the denoising module to make it more robust to complicated degradation. Finally, the SR module reconstructs the HR radiographs using the "clean" low-resolution (LR) radiographs. In addition, we propose a separate-joint training approach to train the model, and extensive experiments are conducted to show that the proposed method is superior to its counterparts. e.g., our proposed method achieves $31.90$ of PSNR with a scale factor of $4 \times$, which is $7.05 \%$ higher than that obtained by recent work, SPSR [16]. Our dataset and code will be made available at: https://github.com/yongsongH/AIDSRGAN-MICCAI2022.
description: Accepted to MICCAI 2022 Workshop. Code: https://github.com/yongsongH/AIDSRGAN-MICCAI2022
The mHz quasi-regular modulations of 4U 1630--47 during its 1998 outburst
Creators: name: Zhao, Qingchang
name: Yin, Hongxing
name: Tao, Lian
name: Yang, Zixu
name: Qu, Jinlu
name: Zhang, Liang
name: Zhang, Shu
name: Qiao, Erlin
name: Bu, Qingcui
name: Zhao, Shujie
name: Li, Panping
name: Huang, Yiming
name: Ma, Ruican
name: Tang, Ruijing
name: Jin, Pei
name: Yu, Wei
name: Liu, Hexin
name: Huang, Yue
name: Ma, Xiang
name: Xiao, Jingyu
name: Zhang, Xuan
name: Zhao, Kang
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the results of a detailed timing and spectral analysis of the quasi-regular modulation (QRM) phenomenon in the black hole X-ray binary 4U 1630--47 during its 1998 outburst observed by Rossi X-ray Timing Explore (RXTE). We find that the $\sim$ 50-110 mHz QRM is flux dependent, and the QRM is detected with simultaneous low frequency quasi-periodic oscillations (LFQPOs). According to the behavior of the power density spectrum, we divide the observations into four groups. In the first group, namely behavior A, LFQPOs are detected, but no mHz QRM. The second group, namely behavior B, a QRM with frequency above $\sim$ 88 mHz is detected and the $\sim$ 5 Hz and $\sim$ 7 Hz LFQPOs are almost overlapping. In the third group, namely behavior C, the QRM frequency below $\sim$ 88 mHz is detected and the LFQPOs are significantly separated. In the forth group, namely behavior D, neither QRM nor LFQPOs are detected. We study the energy-dependence of the fractional rms, centroid frequency, and phase-lag of QRM and LFQPOs for behavior B and C. We then study the evolution of QRM and find that the frequency of QRM increases with hardness, while its rms decreases with hardness. We also analyze the spectra of each observation, and find that the QRM rms of behavior B has a positive correlation with $\rm F_{\rm powerlaw}$ / $\rm F_{\rm total}$. Finally, we give our understanding for this mHz QRM phenomena.
description: 14pages, 15 figures
Determinants of participation in cardiac telerehabilitation during the first surge of COVID-19
Creators: name: Falter, Maarten
name: Scherrenberg, Martijn
name: Martens, Roy
name: Mennes, Jonas
name: Nys, Yorni
name: Polat, Ihsan
name: Kaihara, Toshiki
name: Dendale, Paul
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences

description: Participation rates in cardiac rehabilitation (CR) are low. In multiple trials, telerehabilitation (TR) has been demonstrated to be effective. Still, real-life evidence is scarce. During the first surge of the COVID-19 pandemic our centre deployed a TR programme. This study aimed to characterise the patient population that had, for the first time, the opportunity to participate in cardiac TR and to analyse if there were determining factors for participation or non-participation in TR. All patients enrolled in CR in our centre during the first wave of the COVID-19 pandemic were included in this retrospective cohort study. Data was collected from the hospital electronic records. 369 patients were contacted in the setting of TR. 69 patients could not be reached and were excluded from further analysis. 208 (69%) patients that were contacted agreed to participate in cardiac TR. No significant differences in baseline characteristics were seen between TR participants and TR non-participants. A full model logistic regression did not reveal any significant determinants on participation rate in TR. This study demonstrates that the rate of participation in TR was high (69%). Of the analysed characteristics, none was directly correlated with the willingness to participate in TR. Further research is needed to further assess determinants, barriers and facilitators of TR. Also, research is needed on better delineating digital health literacy and on how to reach also those patients that are less motivated and or less digitally literate.