cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Write a Line: Tests with Answer Templates and String Completion Hints for Self-Learning in a CS1 Course
Creators: name: Sychev, Oleg
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences
subject: K.3.2

description: One of the important scaffolding tasks in programming learning is writing a line of code performing the necessary action. This allows students to practice skills in a playground with instant feedback before writing more complex programs and increases their proficiency when solving programming problems. However, answers in the form of program code have high variability. Among the possible approaches to grading and providing feedback, we chose template matching. This paper reports the results of using regular-expression-based questions with string completion hints in a CS1 course for 4 years with 497 students. The evaluation results show that Perl-compatible regular expressions provide good precision and recall (more than 99\%) when used for questions requiring writing a single line of code while being able to provide string-completion feedback regardless of how wrong the initial student's answer is. After introducing formative quizzes with string-completion hints to the course, the number of questions that teachers and teaching assistants received about questions in the formative quizzes dropped considerably: most of the training question attempts resulted in finding the correct answer without help from the teaching staff. However, some of the students use formative quizzes just to learn correct answers without actually trying to answer the questions.
description: 9 pages, 5 tables, 3 figures, ICSE-SEET 2022
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. peyroti (Ivolas & Peyrot, 1900) †
Middle Miocene (Langhian): NE Atlantic (France: Loire Basin).
(Glibert 1949)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 34, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
A variational framework for the inverse Henderson problem of statistical mechanics
Creators: name: Frommer, Fabio
name: Hanke, Martin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82B21 82B80 60G55

description: The inverse Henderson problem refers to the determination of the pair potential which specifies the interactions in an ensemble of classical particles in continuous space, given the density and the equilibrium pair correlation function of these particles as data. For a canonical ensemble in a bounded domain it has been observed that this pair potential minimizes a corresponding convex relative entropy functional, and that the Newton iteration for minimizing this functional coincides with the so-called inverse Monte Carlo (IMC) iterative scheme. In this paper we show that in the thermodynamic limit analogous connections exist between the specific relative entropy introduced by Georgii and Zessin and a proper formulation of the IMC iteration in the full space. This provides a rigorous variational framework for the inverse Henderson problem, valid within a large class of pair potentials, including, for example, Lennard-Jones type potentials. It is further shown that the pressure is strictly convex as a function of the pair potential and the chemical potential, and that the specific relative entropy at fixed density is a strictly convex function of the pair potential. At a given reference potential and a corresponding density in the gas phase we determine the gradient and the Hessian of the specific relative entropy, and we prove that the Hessian extends to a symmetric positive semidefinite quadratic functional in the space of square integrable perturbations of this potential.
Dynamics of co-orbital exoplanets in a first order resonance chain with tidal dissipation
Creators: name: Couturier, Jérémy
name: Robutel, Philippe
name: Correia, Alexandre C. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Co-orbital planets (in a $1:1$ mean motion resonance) can be formed within a Laplace resonance chain. Here, we develop a secular model to study the dynamics of the resonance chain $p:p:p+1$, where the co-orbital pair is in a first-order mean motion resonance with the outermost third planet. Our model takes into account tidal dissipation through the use of a Hamiltonian version of the constant time-lag model, which extends the Hamiltonian formalism of the point-mass case. We show the existence of several families of equilibria, and how these equilibria extend to the complete system. In one family, which we call the main branch, a secular resonance between the libration frequency of the co-orbitals and the precession frequency of the pericentres has unexpected dynamical consequences when tidal dissipation is added. We report the existence of two distinct mechanisms that make co-orbital planets much more stable within the $p:p:p+1$ resonance chain rather than outside it. The first one is due to negative real parts of the eigenvalues of the linearised system with tides, in the region of the secular resonance mentioned above. The second one comes from non-linear contributions of the vector field and it is due to eccentricity damping. These two stabilising mechanisms increase the chances of a still-to-come detection of exoplanets in the co-orbital configuration.
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. pontileviensis Ivolas & Peyrot, 1900
Middle Miocene (Langhian): NE Atlantic (France, Loire Basin).
(Glibert 1949)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 34, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
Precursors of fatty alcohols in the ISM: Discovery of n-propanol
Creators: name: Jimenez-Serra, Izaskun
name: Rodriguez-Almeida, Lucas F.
name: Martin-Pintado, Jesus
name: Rivilla, Victor M.
name: Melosso, Mattia
name: Zeng, Shaoshan
name: Colzi, Laura
name: Kawashima, Yoshiyuki
name: Hirota, Eizi
name: Puzzarini, Cristina
name: Tercero, Belen
name: de Vicente, Pablo
name: Rico-Villas, Fernando
name: Requena-Torres, Miguel A.
name: Martin, Sergio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Theories on the origins of life propose that early cell membranes were synthesized from amphiphilic molecules simpler than phospholipids such as fatty alcohols. The discovery in the interstellar medium (ISM) of ethanolamine, the simplest phospholipid head group, raises the question whether simple amphiphilic molecules are also synthesized in space. We investigate whether precursors of fatty alcohols are present in the ISM. For this, we have carried out a spectral survey at 7, 3, 2 and 1 mm toward the Giant Molecular Cloud G+0.693-0.027 located in the Galactic Center using the IRAM 30m and Yebes 40m telescopes. Here, we report the detection in the ISM of the primary alcohol n-propanol (in both conformers Ga-n-C3H7OH and Aa-n-C3H7OH), a precursor of fatty alcohols. The derived column densities of n-propanol are (5.5+-0.4)x10^13 cm^-2 for the Ga conformer and (3.4+-0.3)x10^13 cm^-2 for the Aa conformer, which imply molecular abundances of (4.1+-0.3)x10^-10 for Ga-n-C3H7OH and of (2.5+-0.2)x10^-10 for Aa-n-C3H7OH. We also searched for the AGa conformer of n-butanol (AGa-n-C4H9OH) without success yielding an upper limit to its abundance of <4.1x10^-11. The inferred CH3OH:C2H5OH:C3H7OH:C4H9OH abundance ratios go as 1:0.04:0.006:<0.0004 toward G+0.693-0.027, i.e. they decrease roughly by one order of magnitude for increasing complexity. We also report the detection of both syn and anti conformers of vinyl alcohol, with column densities of (1.11+-0.08)x10^14 cm^-2 and (1.3+-0.4)x10^13 cm^-2, and abundances of (8.2+-0.6)x10^-10 and (9.6+-3.0)x10^-11, respectively. The detection of n-propanol, together with the recent discovery of ethanolamine in the ISM, opens the possibility that precursors of lipids according to theories of the origin of life, could have been brought to Earth from outer space.
description: 15 pages, 10 figures, accepted for A&A
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. porellus (de Gregorio, 1884) †
= biangulatus sensu Ĥrnes 1856
Middle Miocene (Badenian): Central Paratethys Sea (Austria).
(Nosowska 2020)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 34, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
SUVDA ERUVCHI VITAMINLARNING HAYVONLAR ORGANIZMIGA TA'SIRI.
Creators: name: Babayeva Sh. Mahammatshokirov K.
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada suvda eruvchi har xil vitaminlarning hayvonlarorganizmiga ijobiy ta’siri, mahsuldorlikni oshirishga samarasi haqida bayon etilgan.
On chiral bosons in 2D and 6D
Creators: name: Mezincescu, Luca
name: Townsend, Paul K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the Hamiltonian formulation of chiral 2k-form electrodynamics, the 2k-form potential on the (4k+1)-space is defined up to the addition of either (i) a closed $2k$-form or (ii) an exact 2k-form, depending on the choice of chirality constraint. Case (i) is realized by the Floreanini-Jackiw 2D chiral boson (for k=0) and its Henneaux-Teitelboim generalisation to k>0. For all k, but focusing on the 6D case, we present a simple Lorentz-invariant Hamiltonian model that realizes case (ii), and we derive it from Siegel's manifestly Lorentz invariant Lagrangian formulation.
description: 24 pages, minor corrections and further additional references in v3
Gibbula sima Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula
Gibbula sima

description: Gibbula s.l. sima (Liverovskaya, 1935) †
= Trochus onustus Liverovskaya, 1935 (non [Lightfoot, 1786]).
Middle Miocene (Konkian): Eastern Paratethys (Russia).
(Iljina 1993)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 34, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. stampinensis (Cossmann & Lambert, 1884) †
Oligocene (Rupelian): NE Atlantic, Paris Basin (France).
(Lozouet 2012)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 34, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
Do exercise interventions for knee osteoarthritis meet physical activity guidelines?
Creators: name: Jones, Matthew
name: Gibbs, Mitchell
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Diseases
subject: Medicine and Health Sciences
subject: Rehabilitation and Therapy
subject: Musculoskeletal Diseases

description: This registration contains the study protocol for a descriptive analysis of exercise interventions that meet physical activity guidelines. The studies will be identified from a recent umbrella review of exercise for hip and knee osteoarthritis.
Localizing narrow Fe K$α$ emission within bright AGN
Creators: name: Andonie, Carolina
name: Bauer, Franz E.
name: Carraro, Rosamaria
name: Arevalo, Patricia
name: Alexander, David M.
name: Brandt, William N.
name: Buchner, Johannes
name: He, Adam
name: Koss, Michael J.
name: Ricci, Claudio
name: Salinas, Vicente
name: Solimano, Manuel
name: Tortosa, Alessia
name: Treister, Ezequiel
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The 6.4 keV Fe Ka emission line is a ubiquitous feature in X-ray spectra of AGN, and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arises. We clarify the nature and origin of the narrow Fe Ka emission using X-ray spectral, timing, and imaging constraints, plus possible correlations to AGN and host galaxy properties, for 38 bright nearby AGN ($z<0.5$) from the BAT AGN Spectroscopic Survey. Modeling Chandra and XMM-Newton spectra, we computed line full-width half-maxima (FWHMs) and constructed Fe Ka line and 2-10 keV continuum light curves. The FWHM provides one estimate of the Fe Ka emitting region size, RFeKa, assuming virial motion. A second estimate comes from comparing the degree of correlation between the variability of the continuum and line-only light curves, compared to simulated light curves. Finally, we extracted Chandra radial profiles to place upper limits on RFeKa. We found that for 90% (21/24) of AGN with FWHM measurements, RFeKa is smaller than the fiducial dust sublimation radius, Rsub. Despite a wide range of variability properties, the constraints on the Fe Ka photon reprocessor size independently confirm that RFeKa is smaller than Rsub in 83% of AGN. Finally, the imaging analysis yields loose upper limits for all but two sources; notably, the Circinus Galaxy and NGC 1068 show significant but subdominant extended Fe Ka emission out to $\sim$100 and $\sim$800 pc, respectively. Based on independent constraints, we conclude that the majority of the narrow Fe Ka emission in typical AGN predominantly arises from regions smaller than and presumably inside Rsub, and thus it is associated either with the outer broad line region or outer accretion disk. However, the large diversity of continuum and narrow Fe Ka variability properties are not easily accommodated by a universal scenario.
description: Accepted for publication in Astronomy and Astrophysics (A&A), 35 pages, 22 figures, 3 tables
The pion in the graviton soft-wall model: phenomenological applications
Creators: name: Rinaldi, M.
name: Ceccopieri, F. A.
name: Vento, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The holographic graviton soft-wall model, introduced to describe the spectrum of scalar and tensor glueballs, is improved to incorporate the realization of chiral-symmetry as in QCD. Such a goal is achieved by including the longitudinal dynamics of QCD into the scheme. Using the relation between AdS/QCD and Light-Front dynamics, we construct the appropriate wave function for the pion which is used to calculate several pion observables. The comparison of our results with phenomenology is remarkably successful.
description: 23 pages, 15 figures. Acceptet version in THE EUROPEAN PHYSICAL JOURNAL C. References added
Hamiltonian Particle-in-Cell methods for Vlasov-Poisson equations
Creators: name: Gu, Anjiao
name: He, Yang
name: Sun, Yajuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper, Particle-in-Cell algorithms for the Vlasov-Poisson system are presented based on its Poisson bracket structure. The Poisson equation is solved by finite element methods, in which the appropriate finite element spaces are taken to guarantee that the semi-discretized system possesses a well defined discrete Poisson bracket structure. Then, splitting methods are applied to the semi-discretized system by decomposing the Hamiltonian function. The resulting discretizations are proved to be Poisson bracket preserving. Moreover, the conservative quantities of the system are also well preserved. In numerical experiments, we use the presented numerical methods to simulate various physical phenomena. Due to the huge computational effort of the practical computations, we employ the strategy of parallel computing. The numerical results verify the efficiency of the new derived numerical discretizations.
Energy fluctuations in one dimensional Zhang sandpile model
Creators: name: Kumar, Naveen
name: Singh, Suram
name: Yadav, Avinash Chand
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the Zhang sandpile model in one-dimension (1D) with locally conservative (or dissipative) dynamics and examine its total energy fluctuations at the external drive time scale. The bulk-driven system leads to Lorentzian spectra, with a cutoff time $T$ growing linearly with the system size $L$. The fluctuations show $1/f^α$ behavior with $α\sim 1$ for the boundary drive, and the cutoff time varies non-linearly. For conservative local dynamics, the cutoff time shows a power-law growth $T \sim L^λ$ that differs from an exponential form $ \sim \exp(μL)$ observed for the nonconservative case. We suggest that the local dissipation is not a necessary ingredient of the system in 1D to get the $1/f$ noise, and the cutoff time can reveal the distinct nature of the local dynamics. We also discuss the energy fluctuations for locally nonconservative dynamics with random dissipation.
description: 15 pages, 16 figures
The EU-SEAKNOT Project: On the Way to Settle a Roadmap for Severe Accident Research
Creators: name: Herranz, Luis Enrique
name: Sanjeev, Gupta
name: Piluso, Pascal
name: Paci, Sandro
Publisher: name: Zenodo
Year: 2023
Subjects: subject: Nuclear engineering
subject: Nuclear fission
subject: Severe Accident

description: Abstract presented at 48ª Reunión Anual de la Sociedad Nuclear Española, 4 – 6 de octubre de 2023, Toledo, Castilla-La Mancha
L'Impatto Dell'Open Access Sul Processo Di Valutazione
Creators: name: Galimberti, Paola
Publisher: name: Zenodo
Year: 2018
Subjects: research evaluation, Italy, Open acccess, Reward

description: The aim of this article is to describe the role of Open Science practices in research assessment procedures in Italy.

Italy seems not to be aware of the importance of Open Science in Europe and European countries, and the gap between the italian research system and the European ones is becoming wider. Italy has not developed policies for Open Access to scientific publications and for research data. Italy has not approved a national policy for Open Science, and no tools are offered to the universities to support it.

We can find Open access mentioned inappropriately in some calls for tenders (Bando PRIN 2017) and however results are not monitored.

In this context, there is no reward for open access practices, nor there is an insight on the advantages of a research system based on openness.
Polarization-independent resonant lattice Kerker effect in phase-change metasurface
Creators: name: Xiong, Lei
name: Luo, Xiaoqing
name: Ding, Hongwei
name: Lu, Yuanfu
name: Li, Guangyuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Resonant lattice Kerker effect in periodic resonators is one of the most interesting generalizations of the Kerker effect that relates to various fascinating functionalities such as scattering management and Huygens metasurfaces. However, so far this effect has been shown to be sensitive to the incident polarization, restricting its applications. Here, we report, for the first time, polarization-independent resonant lattice Kerker effect in metasurfaces composed of periodic Ge$_2$Se$_2$Te$_5$ (GST) disks. For such a metasurface of square lattice, the spectrally overlap of the electric dipole and magnetic dipole surface lattice resonances can be realized by choosing an appropriate GST crystalline fraction regardless of the incident polarization. The operation wavelength and the required GST crystalline fraction can be conveniently tuned over large ranges since these parameters scale linearly with the disk size and the lattice period, greatly facilitating the design. Making use of the obtained resonant lattice Kerker effect, we realize a reconfigurable and polarization-independent lattice Huygens' metasurface with a dynamic phase modulation of close to $2π$ and high transmittance. This work will advance the engineering of the resonant lattice Kerker effect and promote its applications in phase modulation and wavefront control.
description: 21 pages, 7 figures
Nuclear spectra from low-energy interactions
Creators: name: Ljungberg, J.
name: Carlsson, B. G.
name: Rotureau, J.
name: Idini, A.
name: Ragnarsson, I.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A method to describe spectra starting from nuclear density functionals is explored. The idea is based on postulating an effective Hamiltonian that reproduces the stiffness associated with collective modes. The method defines a simple form of such an effective Hamiltonian and a mapping to go from a density functional to the corresponding Hamiltonian. In order to test the method, the Hamiltonian is constrained using a Skyrme functional and solved with the generator-coordinate method to describe low-lying levels and electromagnetic transitions in $^{48,49,50,52}$Cr and $^{24}$Mg.
description: 16 pages, 14 figures and one table
Phase diagram of superconductivity in the integer quantum Hall regime
Creators: name: Schirmer, Jonathan
name: Liu, C. -X.
name: Jain, J. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: An interplay between pairing and topological orders has been predicted to give rise to superconducting states supporting exotic emergent particles, such as Majorana particles obeying non-Abelian braid statistics. We consider a system of spinless electrons on a Hofstadter lattice with nearest neighbor attractive interaction, and solve the mean-field Bogoliubov-de Gennes equations in a self-consistent fashion, leading to gauge invariant solutions that display a rich phase diagram as a function of the chemical potential, magnetic field and the interaction. As the strength of the attractive interaction is increased, the system first makes a transition from a quantum Hall phase to a skyrmion lattice phase that is fully gapped in the bulk but has topological chiral edge current, characterizing a topologically non-trivial state. This is followed by a vortex phase in which the vortices carrying Majorana modes form a lattice; the spectrum contains a low-energy Majorana band arising from the coupling between neighboring vortex-core Majorana modes but does not have chiral edge currents. For some parameters, a dimer vortex lattice occurs with no low energy Majorana band. The experimental feasibility and the observable consequences of skyrmions as well as Majorana fermions are indicated.
description: 14 pages, 8 figures
Gibbula steiningeri Harzhauser, 2021, nov. nom.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula
Gibbula steiningeri

description: Gibbula steiningeri nov. nom. †
nov. nom. pro. Trochus (Oxystele) amedei var. bicincta (Schaffer, 1912) [non Philippi, 1849]
In honor of Fritz F. Steininger, in recognition to his contributions on Neogene stratigraphy.
Early Miocene (Eggenburgian): Central Paratethys Sea (Austria).
(Schultz 1971)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 35, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars: II. The northern WNE sequence
Creators: name: Dsilva, K.
name: Shenar, T.
name: Sana, H.
name: Marchant, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Most massive stars reside in multiple systems that will interact over the course of their lifetime. Classical Wolf-Rayet (WR) stars represent the final end stages of stellar evolution at the upper-mass end. As part of a homogeneous, magnitude-limited ($V\leq12$) spectroscopic survey of northern Galactic WR stars, this paper aims to establish the observed and intrinsic multiplicity properties of the early-type nitrogen-rich WR population (WNE). We obtained high-resolution spectroscopic time series of the complete magnitude-limited sample of 16 WNE stars observable with the 1.2 m Mercator telescope at La Palma, typically providing a time base of about two to eight years. We measured relative radial velocities (RVs) using cross-correlation and used RV variations to flag binary candidates. Adopting a peak-to-peak RV variability threshold of 50 km/s as a criterion found an observed multiplicity fraction of 0.44$\pm$0.12. Using an updated Monte Carlo method with a Bayesian framework, we calculated the three-dimensional likelihood for the intrinsic binary fraction, the maximum period, and the power-law index for the period distribution for the WNE population. We also re-derived multiplicity parameters for the Galactic WC population. We found an intrinsic multiplicity fraction of $0.56\substack{+0.20 \\ -0.15}$ for the parent WNE population. For the Galactic WC population, we re-derive an intrinsic multiplicity fraction of $0.96\substack{+0.04 \\ -0.22}$. The derived multiplicity parameters for the WNE population are quite similar to those derived for main-sequence O binaries but differ from those of the WC population. The significant shift in the WC period distribution towards longer periods is too large to be explained via expansion of the orbit due to stellar winds, and we discuss possible implications of our results.
description: 17 pages, 12 figures
Exoplanet Cartography using Convolutional Neural Networks
Creators: name: Meinke, K.
name: Stam, D. M.
name: Visser, P. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In the near-future, dedicated telescopes observe Earth-like exoplanets in reflected light, allowing their characterization. Because of the huge distances, every exoplanet will be a single pixel, but temporal variations in its spectral flux hold information about the planet's surface and atmosphere. We test convolutional neural networks for retrieving a planet's rotation axis, surface and cloud map from simulated single-pixel flux and polarization observations. We investigate the assumption that the planets reflect Lambertian in the retrieval while their actual reflection is bidirectional, and of including polarization in retrievals. We simulate observations along a planet's orbit using a radiative transfer algorithm that includes polarization and bidirectional reflection by vegetation, desert, oceans, water clouds, and Rayleigh scattering in 6 spectral bands from 400 to 800 nm, at various photon noise levels. The surface-types and cloud patterns of the facets covering a model planet are based on probability distributions. Our networks are trained with simulated observations of millions of planets before retrieving maps of test planets. The neural networks can constrain rotation axes with a mean squared error (MSE) as small as 0.0097, depending on the orbital inclination. On a bidirectionally reflecting planet, 92% of ocean and 85% of vegetation, desert, and cloud facets are correctly retrieved, in the absence of noise. With realistic noise, it should still be possible to retrieve the main map features with a dedicated telescope. Except for face-on orbits, a network trained with Lambertian reflecting planets, yields significant retrieval errors when given observations of bidirectionally reflecting planets, in particular, brightness artefacts around a planet's pole. Including polarization improves retrieving the rotation axis and the accuracy of the retrieval of ocean and cloud facets.
description: 38 pages, 25 figures, 5 tables, accepted for publication in Astron. Astrophys
Viscous inertial modes on a differentially rotating sphere: Comparison with solar observations
Creators: name: Fournier, Damien
name: Gizon, Laurent
name: Hyest, Laura
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In a previous paper we studied the effect of latitudinal rotation on solar equatorial Rossby modes in the beta-plane approximation. Since then, a rich spectrum of inertial modes has been observed on the Sun, which is not limited to the equatorial Rossby modes and includes high-latitude modes. Here we extend the computation of toroidal modes in 2D to spherical geometry, using realistic solar differential rotation and including viscous damping. The aim is to compare the computed mode spectra with the observations and to study mode stability. At fixed radius, we solve the eigenvalue problem numerically using a spherical harmonics decomposition of the velocity stream function. Due to the presence of viscous critical layers, the spectrum consists of four different families: Rossby modes, high-latitude modes, critical-latitude modes, and strongly damped modes. For each longitudinal wavenumber m<4, up to three Rossby-like modes are present on the sphere, in contrast to the equatorial beta plane where only the equatorial Rossby mode is present. The least damped modes in the model have eigenfrequencies and eigenfunctions that resemble the observed modes; the comparison improves when the radius is taken in the lower half of the convection zone. For radii above 0.75R and Ekman numbers E<10^{-4}, at least one mode is unstable. For either m=1 or m=2, up to two Rossby modes are unstable when the radial dependence of the Ekman number follows a quenched diffusivity model (E=2. 10^{-5} at the base of the convection zone). For m=3, up to two Rossby modes can be unstable, including the equatorial Rossby mode. Although the 2D model discussed here is highly simplified, the spectrum of toroidal modes appears to include many of the observed solar inertial modes. The self-excited modes in the model have frequencies close to those of the observed modes with the largest amplitudes.
Influence of substrate on the redox behavior of Fe3O4/Oxide substrate heterostructures
Creators: name: Xu, Yifan
Publisher: name: Forschungzentrum Jülich
Year: 2024

description: 1st Ph.D. and PostDoc Days JCNS-2 in 2024, JCNS-2 + online, Germany, 14 Feb 2024 - 15 Feb 2024
Imaging of PbWO4 Crystals for G Experiment Test Masses Using a Laser Interferometer
Creators: name: Assumin-Gyimah, K. T. A.
name: Holt, M. G.
name: Dutta, D.
name: Snow, W. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: It is highly desirable for future measurements of Newton's gravitational constant $G$ to use test/source masses that allow nondestructive, quantitative internal density gradient measurements. High density optically transparent materials are ideally suited for this purpose since their density gradient can be measured with laser interferometry, and they allow in-situ optical metrology methods for the critical distance measurements often needed in a $G$ apparatus. We present an upper bound on possible internal density gradients in lead tungstate (PbWO$_4$) crystals determined using a laser interferometer. We placed an upper bound on the fractional atomic density gradient in two PbWO$_4$ test crystals of ${1 \over ρ}{dρ\over dx}<2.1 \times 10^{-8}$ cm$^{-1}$. This value is more than two orders of magnitude smaller than what is required for $G$ measurements. They are also consistent with but more sensitive than a recently reported measurements of the same samples, using neutron interferometry. These results indicate that PbWO$_4$ crystals are well suited to be used as test masses in $G$ experiments. Future measurements of internal density gradients of test masses used for measurements of $G$ can now be conducted non-destructively for a wide range of possible test masses.
description: 8 pages, 5 figures, submitted to Classical and Quantum Gravity. arXiv admin note: substantial text overlap with arXiv:2109.14008
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. striatellata (Millet, 1865) †
Late Miocene (Tortonian): NE Atlantic (France: Loire Basin).
(Landau et al. 2017)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 35, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
MPEC 2025-A109 : 2024 YA26
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 YA26

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Revisiting Witten-O'Raifeartaigh Inflation for a Non-minimally Coupled Scalar Field
Creators: name: Santos, F. B. M. dos
name: Silva, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this work, we revisit the Witten-O'Raifeartaigh model of inflation, in which the potential takes a $\operatorname{log}^2(ϕ/M)$ form, when the scalar field is non-minimally coupled to gravity. We investigate the impact of the coupling in the prediction of the inflationary parameters, thereby affecting the viability of the model. We find that a small coupling of order $ξ\sim10^{-3}$ is preferred by data at the $n_s-r$ plane level, and that the presence of a non-zero $ξ$ allows for a large interval of the mass scale $M$, in which it is possible to achieve a low tensor-to-scalar ratio. We also establish constraints imposed by a subsequent reheating era, in which its duration and temperature can be related to CMB observables, which in return, restricts the possible values for the $n_s$ and $r$ parameters.
description: 15 pages, 5 figures
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. tauracuta Sacco, 1896 †
Early Miocene (Burdigalian): Proto-Mediterranean Sea (Italy: Turin Hills).
(Cossmann 1918; Ferrero-Mortara et al. 1984)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 35, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
From "R-Drive to RRKive" – a comprehensive, open and sustainable set of principles and tools for low (and high) resource archival-repositories
Creators: name: Sefton, Peter
name: McClellan, Robert
name: Lynch, Michael
name: Sacal Bonequi, Moises
name: Thieberger, Nick
Publisher: name: Zenodo
Year: 2024
Subjects: R0-Crate
OR2024
Sustainable repositories
Oxford Common File Layout

description: We present a toolkit for sustainable archival repositories, with metadata and storage standards as well as APIs and data portals that can be assembled by communities with various levels of resourcing into repository solutions at a variety of scales, with fallback to offline operation. Tools are designed to work in low-resource environments allowing communities to have agency and control over their materials. We prioritize sustainability, simplicity, standardization, linked-data description and clear licensing over user interface features, in line with Suleman's keynote presentation at OR2023, while still being able to drive rich, full-featured services when resources allow and fall back to a sustainable core if needed.

Much of the data we work with is subject to Indigenous Cultural Intellectual property (ICIP) rights, controlled by First Nations peoples guided by Indigenous data sovereignty principles; we must ensure it is handled in a conscionable and culturally responsible manner.

Making data Accessible does not always mean Open Access – under both research ethics and the CARE and FAIR principles, data by and about humans needs access control and licensing. Our framework deals with these issues and is built from the ground up to be "as open as possible, as closed as needed".
An $\ell_0\ell_2$-norm regularized regression model for construction of robust cluster expansions in multicomponent systems
Creators: name: Zhong, Peichen
name: Chen, Tina
name: Barroso-Luque, Luis
name: Xie, Fengyu
name: Ceder, Gerbrand
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We introduce the $\ell_0\ell_2$-norm regularization and hierarchy constraints into linear regression for the construction of cluster expansion to describe configurational disorder in materials. The approach is implemented through mixed integer quadratic programming (MIQP). The $\ell_2$-norm regularization is used to suppress intrinsic data noise, while $\ell_0$-norm is used to penalize the number of non-zero elements in the solution. The hierarchy relation between clusters imposes relevant physics and is naturally included by the MIQP paradigm. As such, sparseness and cluster hierarchy can be well optimized to obtain a robust, converged, and effective cluster interactions with improved physical meaning. We demonstrate the effectiveness of $\ell_0\ell_2$-norm regularization in two high-component disordered rocksalt cathode material systems, where we compare the cross-validation and convergence speed, reproduction of phase diagrams, voltage profiles, and Li-occupancy energies with those of the conventional $\ell_1$-norm regularized cluster expansion model.
Gibbula Harzhauser, 2021, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. taurinensis (Sacco, 1896)
Early Miocene (Burdigalian): Proto-Mediterranean Sea (Italy).
(Bonci et al. 2000)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 35, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088
Reconstructing solar magnetic fields from historical observations VIII. AIA 1600 Å contrast as a proxy of solar magnetic fields
Creators: name: Tähtinen, Ismo
name: Virtanen, Ilpo
name: Pevtsov, Alexei A.
name: Mursula, Kalevi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The bright regions in the solar chromosphere and temperature minimum have a good spatial correspondence with regions of intense photospheric magnetic field. Their observation started more than a hundred years ago with the invention of the spectroheliograph. While the historical spectroheliograms are essential for studying the long-term variability of the Sun, the modern satellite-borne observations can help us reveal the nature of chromospheric brightenings in previously unattainable detail. Our aim is to improve the understanding of the relation between magnetic fields and radiative structures by studying modern seeing-free observations of far-ultraviolet (FUV) radiation around 1600 Å and photospheric magnetic fields. We used Helioseismic and Magnetic Imager (HMI) observations of photospheric magnetic fields and Atmospheric Imaging Assembly (AIA) observations of FUV contrast around 1600 Å. We developed a robust method to find contrast thresholds defining bright and dark AIA 1600 Å pixels, and we combine them to bright and dark clusters. We investigate the relation of magnetic fields and AIA 1600 Å radiation in bright and dark clusters. We find that the percentage of bright pixels entirely explains the observed variability of 1600 Å emission. We developed a multilinear regression model based on the percentages of bright and dark pixels, which can reliably predict the magnitude of the disk-averaged unsigned magnetic field. We find that bright and dark clusters closely correspond respectively to the populations of moderate (B > 55 G) and strong (B > 1365 G) magnetic field HMI clusters. The largest bright clusters have a constant mean unsigned magnetic field, as found previously for Ca II K plages. However, the magnetic field strength of bright clusters is 254.7$\pm$0.1 G, which is roughly 100 G larger than found earlier for Ca II K plages.
description: 27 pages, 31 figures
Jaring Saraf Tiruan dalam Tata Ruang Wilayah Pesisir & Pulau-Pulau Kecil
Creators: name: Joyce Christian, Kumaat
Publisher: name: Zenodo
Year: 2023

description: Tulisan ini adalah merupakan ide peneliti yang akan diterapkan dalam penelitian-penelitian pengelolaan wilayah pesisir secara berkelanjutan
T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD
Creators: name: Abele, Maurizio
name: Aicher, Matthias
name: Piacenza, Fulvio
name: Schäfer, Andreas
name: Vogelsang, Werner
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the single-spin asymmetry $A_{UL}$ in semi-inclusive deep-inelastic scattering of unpolarized leptons and longitudinally polarized protons at large transverse momentum of the produced hadron. Our calculation is performed in collinear factorization at the lowest order of QCD perturbation theory. For photon exchange the asymmetry is T-odd and receives contributions from the interference of the tree level and one-loop absorptive amplitudes. We consider the behavior of the spin asymmetry at low transverse momentum where contact to the formalism based on transverse-momentum dependent distribution functions can be made. We also present some phenomenological results relevant for the COMPASS and HERMES experiments and the future Electron-Ion Collider.
description: 23 pages, 9 figures
Constraints on the magnetized Ernst black hole spacetime through quasiperiodic oscillations
Creators: name: Shaymatov, Sanjar
name: Jamil, Mubasher
name: Jusufi, Kimet
name: Bamba, Kazuharu
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the dynamics of test particles around a magnetized Ernst black hole considering its magnetic field in the environment surrounding the black hole. We show how its magnetic field can influence the dynamics of particles and epicyclic motion around the black hole. Based on the analysis, we find that the radius of the innermost stable circular orbit (ISCO) for both neutral and charged test particles and epicyclic frequencies are strongly affected by the influence of the magnetic field. We also show that the ISCO radius of charged particles decreases rapidly. It turns out that the gravitational and Lorentz forces of the magnetic field are combined, thus strongly shrinking the values of the ISCO of charged test particles. Finally, we obtain the generic form for the epicyclic frequencies and select three microquasars with known astrophysical quasiperiodic oscillation (QPO) data to constrain the magnetic field.We show that the magnetic field is of the order of magnitude $B\sim 10^{-7}$ Gauss, taking into account the motion of neutral particles in circular orbit about the black hole.
description: 11 pages, 10 captioned figures. Updated to match with the published version
Electron emission from plasmonically induced Floquet bands at metal surfaces
Creators: name: Gumhalter, Branko
name: Novko, Dino
name: Petek, Hrvoje
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We explore the possibility of existence of plasmonically generated electronic Floquet bands at metal surfaces by studying the gauge transformed electron-surface plasmon interaction in the prepumped plasmonic coherent state environment. These bands may promote non-Einsteinian electron emission from metal surfaces exposed to primary interactions with strong electromagnetic fields. Resonant behaviour and scaling of emission yield with the parent electronic structure and plasmonic state parameters are estimated for Ag(111) surface. Relative yield intensities from non-Einsteinian emission channels in photoelectron spectra offer the means to calibrate the mediating plasmonic fields and therefrom ensuing surface Floquet bands.
description: 12 pages, 5 figures
Gibbula tauroparva Risso 1826, s.l.
Creators: name: Harzhauser, Mathias
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Archaeogastropoda
Trochidae
Gibbula

description: Gibbula s.l. tauroparva Sacco, 1896 †
introduced as Gibbula (Phorculellus) tauroparva; potentially a secondary homonym of Trochocochlea tauroparva Sacco, 1896 if both are placed in Gibbula.
Early Miocene (Burdigalian): Proto-Mediterranean Sea (Italy).
(Ferrero-Mortara et al. 1984)
description: Published as part of Harzhauser, Mathias, 2021, The Cainozoic to present-day record of Circum-Mediterranean, NE Atlantic and North Sea Cantharidinae and Trochinae (Trochoidea, Gastropoda) - a synopsis, pp. 1-81 in Zootaxa 4902 (1) on page 35, DOI: 10.11646/zootaxa.4902.1.1, http://zenodo.org/record/4419088