cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Symplectic group structure of the 48Cr, 88Ru, and 92Pd ground states
Creators: name: Neergård, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The ground states of 48Cr, 88Ru, and 92Pd are studied in the 1f7/2 or 1g9/2 shell model with effective interactions from the literature. They are found to be composed, quite independently of the shell and the interaction, roughly of 75% of (s,t)=(0,0) and 25% of (s,t)=(4,0), where s is the seniority and t the reduced isospin. Other irreps of the symplectic group Sp(2j+1), where j is the single-nucleon angular momentum, make only very small contributions. The state chi obtained by antisymmetriziation and normalization of the ground state in the stretch scheme of Danos and Gillet [M. Danos and V. Gillet, Phys. Rev. 161, 1034 (1967)] has a very different structure where the Sp(2j+1) irreps other than (s,t)=(0,0) and (4,0) contribute 20% and 41% for j=7/2 and 9/2, respectively. The contributions of chi and the s=0 state to the calculated ground states state are about equal for 48Cr. For 88Ru and 92Pd the s=0 state is unambiguously a better approximation to the calculated states than chi. A state chi' obtained by antisymmetrization and normalization of the product of two stretch-scheme ground states of the system with two valence nucleons or nucleon holes of each type has much larger overlaps with the calculated ground states than chi but a deviating Sp(2j+1) decomposition.
description: Considerably extended version to be published in Physical Review C. Appendix replaced with brief argument in text
Galaxy rotation curves and universal scaling relations: comparison between phenomenological and fermionic dark matter profiles
Creators: name: Krut, A.
name: Argüelles, C. R.
name: Chavanis, P. -H.
name: Rueda, J. A.
name: Ruffini, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxies show different halo scaling relations such as the Radial Acceleration Relation, the Mass Discrepancy Acceleration Relation (MDAR) or the dark matter Surface Density Relation (SDR). At difference with traditional studies using phenomenological $Λ$CDM halos, we analyze the above relations assuming that dark matter (DM) halos are formed through a Maximum Entropy Principle (MEP) in which the fermionic (quantum) nature of the DM particles is dully accounted for. For the first time a competitive DM model based on first physical principles, such as (quantum) statistical-mechanics and thermodynamics, is tested against a large data-set of galactic observables. In particular, we compare the fermionic DM model with empirical DM profiles: the NFW model, a generalized NFW model accounting for baryonic feedback, the Einasto model and the Burkert model. For this task, we use a large sample of 120 galaxies taken from the Spitzer Photometry and Accurate Rotation Curves (SPARC) data-set, from which we infer the DM content to compare with the models. We find that the Radial Acceleration Relation and MDAR are well explained by all the models with comparable accuracy, while the fits to the individual rotation curves, in contrast, show that cored DM halos are statistically preferred with respect to the cuspy NFW profile. However, very different physical principles justify the flat inner halo slope in the most favored DM profiles: while generalized NFW or Einasto models rely on complex baryonic feedback processes, the MEP scenario involves a quasi-thermodynamic equilibrium of the DM particles.
description: 20 pages, 12 figures. Accepted for publication in The Astrophysical Journal
3D Structures of equatorial waves and the resulting superrotation in the atmosphere of a tidally locked hot Jupiter
Creators: name: Tsai, Shang-Min
name: Dobbs-Dixon, Ian
name: Gu, Pin-Gao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Three-dimensional equatorial trapped waves excited by stellar isolation and the resulting equatorial superrotating jet in a vertical stratified atmosphere of a tidally-locked hot Jupiter are investigated. Taking the hot Jupiter HD 189733b as a fiducial example, we analytically solve a set of linear equations subject to stationary stellar heating with a uniform zonal-mean flow included. We also extract wave information in the final equilibrium state of the atmosphere from the radiative hydrodynamical simulation for HD 189733b by Dobbs-Dixon & Agol (2013). We find that the analytic wave solutions are able to qualitatively explain the three-dimensional simulation results. Studying the vertical structure of waves allows us to explore new wave features such as the westward tilt of wavefronts related to the Rossby-wave resonance as well as double gyres of dispersive Rossby waves. We also make an attempt to apply our linear wave analysis to explain some numerical features associated with the equatorial jet development seen in the GCM by Showman & Polvani (2011). During the spin-up phase of the equatorial jet, the acceleration of the jet as a result of the divergence of the wave momentum flux can be in principle boosted by the Rossby-wave resonance as the superrotating jet speed is close to the phase speed of the Rossby waves. However, we also find that as the jet speed increases, the Rossby-wave structure shifts eastward, while the Kelvin-wave structure remains approximately stationary, leading to the decline of the acceleration rate. Our analytic model of jet evolution implies that there exists only one stable equilibrium state of the atmosphere, possibly implying that the final state of the atmosphere is independent of initial conditions in the linear regime. Limitations and future improvements are also discussed.
description: Accepted for publication in ApJ
title: Acupuncture & moxibustion for osteoarthritis of the knee: a component analysis approach
Creators: name: Appleyard, I
Publisher: name: London South Bank University
Year: 2018

description: This project investigates the use of acupuncture and moxibustion for
osteoarthritis of the knee. The project includes a pilot study which tests a
protocol for a randomised controlled trial. Two pieces of primary research that
develop new knowledge regarding acupuncture in practice: expert interviews
and practitioner survey. A systematic review of clinical trials investigating
warm needle acupuncture for osteoarthritis of the knee. A narrative review of
the theoretical approaches to treating knee pain with acupuncture.
The first phase of the project reviews the literature on the methodological
challenges of research into acupuncture. A new framework for acupuncture
research is developed. Key issues identified are: a placebo acupuncture
technique is inherently impossible; there is no ‘theory of traditional East Asian
medicine’ that can be falsified. Component analysis is proposed as a potential
solution to these challenges. Moreover, clinical research can only be well
designed and properly interpreted if triangulated with knowledge of theory
and practice.
The knowledge of acupuncture in practice, developed in this project, is used to
re-evaluate the evidence-base. The external validity of acupuncture protocols
and the risk of bias from the sham procedures are both shown to be
problematic. This suggests that previous interpretations underestimate the
efficacy of acupuncture. The research also indicates that acupuncture styles, e.g.
TCM, cannot be clearly delineated, which has implications for evaluating and
reporting clinical trials. In phase 3 of the project, the relationship between
physical and psychological components is found to be highly complex.
Subsequently, the research framework is further refined to account for this
complexity. The pilot study identified problems with the protocol and solutions
are proposed
The phases of the project are guided by the framework. Therefore, the project
not only develops new knowledge regarding osteoarthritis of the knee, but also
serves as a demonstration of the component analysis approach which could be
utilised to investigate other conditions.
Timing analysis of EXO 2030+375 during its 2021 giant outburst observed with Insight-HXMT
Creators: name: Fu, Yu-Cong
name: Song, L. M.
name: Ding, G. Q.
name: Ge, M. Y.
name: Tuo, Y. L.
name: Zhang, S.
name: Zhang, S. N.
name: Hou, X.
name: Qu, J. L.
name: Zhang, J.
name: Zhang, L.
name: Bu, Q. C.
name: Huang, Y.
name: Ma, X.
name: Zhou, X.
name: Yan, W. M.
name: Yang, Z. X.
name: Lu, X. F.
name: Li, T. M.
name: Xu, Y. C.
name: Wang, P. J.
name: Xiao, S. H.
name: Liu, H. X.
name: Ren, X. Q.
name: Du, Y. F.
name: zhao, Q. X.
name: Xiao, Y. X.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the evolution of the X-ray pulsations of EXO 2030+375 during its 2021 outburst using the observations from \textit{Insight}-HXMT. Based on the accretion torque model, we study the correlation between the spin frequency derivatives and the luminosity. Pulsations can be detected in the energy band of 1--160 keV. The pulse profile evolves significantly with luminosity during the outburst, leading to that the whole outburst can be divided into several parts with different characteristics. The evolution of the pulse profile reveals the transition between the super-critical (fan-beam dominated) and the sub-critical accretion (pencil-beam dominated) mode. From the accretion torque model and the critical luminosity model, based on a distance of 7.1 kpc, the inferred magnetic fields are $(0.41-0.74) \times 10^{12}$ G and $(3.48-3.96) \times 10^{12}$ G, respectively, or based on a distance of 3.6 kpc, the estimated magnetic fields are $(2.4-4.3) \times 10^{13}$ G and $(0.98-1.11)\times 10^{12}$ G, respectively. Two different sets of magnetic fields both support the presence of multipole magnetic fields of the NS.
Rings, Ripples, and Rotation: Connecting Black Holes to Black Rings
Creators: name: Dias, Oscar J. C.
name: Santos, Jorge E.
name: Way, Benson
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Singly-spinning Myers-Perry black holes in d>5 spacetime dimensions are unstable for sufficiently large angular momentum. We numerically construct (in d=6 and d=7) two new stationary branches of lumpy (rippled) black hole solutions which bifurcate from the onset of this ultraspinning instability. We give evidence that one of these branches connects through a topology-changing merger to black ring solutions which we also construct numerically. The other branch approaches a solution with large curvature invariants. We are also able to compare the d=7 ring solutions with results from finite-size corrections to the blackfold approach, finding excellent agreement.
description: 14 pages. 8 figures. v2: Appendix with discussion of numerical details and references added. Matches published version
Partial Order Infinitary Term Rewriting
Creators: name: Bahr, Patrick
Publisher: name: arXiv
Year: 2014
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We study an alternative model of infinitary term rewriting. Instead of a metric on terms, a partial order on partial terms is employed to formalise convergence of reductions. We consider both a weak and a strong notion of convergence and show that the metric model of convergence coincides with the partial order model restricted to total terms. Hence, partial order convergence constitutes a conservative extension of metric convergence, which additionally offers a fine-grained distinction between different levels of divergence. In the second part, we focus our investigation on strong convergence of orthogonal systems. The main result is that the gap between the metric model and the partial order model can be bridged by extending the term rewriting system by additional rules. These extensions are the well-known Böhm extensions. Based on this result, we are able to establish that -- contrary to the metric setting -- orthogonal systems are both infinitarily confluent and infinitarily normalising in the partial order setting. The unique infinitary normal forms that the partial order model admits are Böhm trees.
title: Περιβάλλον και Βιώσιμη Ανάπτυξη
title: Περιβάλλον και Βιώσιμη Ανάπτυξη
Creators: name: Tsiaras, Stefanos
name: Tsiroukis, Achillefs
Publisher: name: Kallipos, Open Academic Editions
Year: 2022
Subjects: Περιβάλλον
Βιώσιμη ανάπτυξη
Φυσικοί πόροι
Δείκτες βιώσιμης ανάπυξης
Βιώσιμη κατανάλωση
Περιβαλλοντική πολιτική
Environment
Sustainable development
Natural resources
Sustainability indicators
Sustainable consumption
Environmental policy

description: Το βιβλίο εξετάζει την έννοια της βιώσιμης ανάπτυξης ...
description: Το βιβλίο εξετάζει την έννοια της βιώσιμης ανάπτυξης υπό το πρίσμα της διάστασης του περιβάλλοντος. Η βιώσιμη ανάπτυξη κυριαρχεί ως έννοια στην επιστημονική κοινότητα εδώ και τριάντα και πλέον χρόνια, αλλά παραμένει επίκαιρη, καθώς εξελίσσεται, επανακαθορίζεται και οι στόχοι της αναπροσαρμόζονται. Ο διεθνής διάλογος για τη βιώσιμη ανάπτυξη συνεχίζεται με πρωτοβουλία των Ηνωμένων Εθνών με τη δημοσιοποίηση της Ατζέντας 2030 για τη βιώσιμη ανάπτυξη του μέλλοντος με τίτλο "Μετασχηματίζοντας το μέλλον μας". Στο βιβλίο παρουσιάζεται αναλυτικά ο ρόλος της βιώσιμης ανάπτυξής σε κρίσιμους τομείς του ευρύτερου περιβαλλοντικού τομέα, σε συνδυασμό με τους στόχους της βιώσιμης ανάπτυξης. Το βιβλίο αποτελείται από 8 κεφάλαια. Στο 1ο κεφάλαιο γίνεται ιστορική αναδρομή στις διεθνείς διασκέψεις για το περιβάλλον, διερευνώντας τα ζητήματα που ιστορικά απασχολούσαν τη διεθνή κοινότητα. Στο 2ο κεφάλαιο παρουσιάζεται η ιστορική εξέλιξη του όρου βιώσιμη ανάπτυξη και αναλύονται οι τρεις πυλώνες της βιώσιμης ανάπτυξης. Στο 3ο κεφάλαιο παρουσιάζονται διάφορα εργαλεία για τη μέτρηση της βιώσιμης ανάπτυξης, ενώ ιδιαίτερη αναφορά γίνεται στους δείκτες βιώσιμης ανάπτυξης και στην επίδραση της κλίμακας στη βιώσιμη ανάπτυξη με έμφαση στις λιγότερο ευνοημένες περιοχές. Στο 4ο κεφάλαιο παρουσιάζονται η Ατζέντα 2030 για τη βιώσιμη ανάπτυξη και οι Στόχοι Βιώσιμης Ανάπτυξης. Στο 5ο κεφάλαιο εξετάζεται ο ρόλος του διεθνούς παράγοντα στη βιώσιμη ανάπτυξη. Στο 6ο κεφάλαιο αναλύεται η επίδραση της ανάπτυξης και της κατανάλωσης στο φυσικό περιβάλλον και στον φυσικό πλούτο, ενώ εξετάζεται η έννοια της αειφορίας σε σχέση με την ανάπτυξη. Στο 7ο κεφάλαιο εξετάζεται η σύνδεση της βιώσιμης ανάπτυξης με τη χρήση των υλικών, τη διαχείριση των αποβλήτων και την ανακύκλωση, ενώ εξετάζεται επίσης η επίδραση της ρύπανσης και των περιβαλλοντικών επιπτώσεων στη βιώσιμη ανάπτυξη. Στο 8ο κεφάλαιο παρουσιάζονται ειδικά θέματα βιώσιμης ανάπτυξης όπως η κυκλική οικονομία και η εταιρική κοινωνική ευθύνη.
Bioschemas Training profiles at the SIB Swiss Institute of Bioinformatics
Creators: name: Palagi, Patricia M.
Publisher: name: Zenodo
Year: 2023
Subjects: metadata
information retrieval
bioinformatics
standards
ontologies
training
training materials
courses

description: At SIB, we have deployed in the SIB Training portal the three Bioschemas training profiles: Course, CourseInstance, and TrainingMaterial (Twitter thread with an illustration), and in this talk we will briefly describe this implementation, and our plans to increase adoption within SIB and beyond.
Prospects for ray-tracing light intensity and polarization in models of accreting compact objects using a GPU
Creators: name: Moscibrodzka, Monika
name: Yfantis, Aristomenis
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Event Horizon Telescope (EHT) has recently released high-resolution images of accretion flows onto two supermassive black holes. Our physical understanding of these images depends on accuracy and precision of numerical models of plasma and radiation around compact objects. The goal of this work is to speed up radiative-transfer simulations used to create mock images of black holes for comparison with the EHT observations. A ray-tracing code for general relativistic and fully polarized radiative transfer through plasma in strong gravity is ported onto a graphics processing unit (GPU). We describe our GPU implementation and carry out speedup tests using models of optically thin advection-dominated accretion flow (ADAF) onto a black hole realised semi-analytically and in 3D general relativistic magnetohydrodynamics simulations, low and very high image pixel resolutions, and two different sets of CPU+GPUs. We show that a GPU with high double precision computing capability can significantly reduce the image production computational time, with a speedup factor of up to approximately 1200. The significant speedup facilitates, e.g., dynamic model fitting to the EHT data, including polarimetric data. The method extension may enable studies of emission from plasma with nonthermal particle distribution functions for which accurate approximate synchrotron emissivities are not available. The significant speedup reduces the carbon footprint of the generation of the EHT image libraries by at least an order of magnitude.
description: 6 pages, 1 table, 2 figures, Accepted to ApJS, after editorial corrections
Power Spectra beyond the Slow Roll Approximation in Theories with Non-Canonical Kinetic Terms
Creators: name: van de Bruck, Carsten
name: Robinson, Mathew
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive analytical expressions for the power spectra at the end of inflation in theories with two inflaton fields and non-canonical kinetic terms. We find that going beyond the slow-roll approximation is necessary and that the nature of the non-canonical terms have an important impact on the final power spectra at the end of inflation. We study five models numerically and find excellent agreement with our analytical results. Our results emphasise the fact that going beyond the slow-roll approximation is important in times of high-precision data coming from cosmological observations.
description: 23 pages, 11 figures, JCAP style. Results unchanged, minor corrections/comments added. This version to be published in JCAP
title: Serious Film Games
title: Σύμμικτες Ιδιότητες, Τρόποι και Λειτουργίες στην Εκπαίδευση
titleType: AlternativeTitle
title: Serious Film Games
title: Σύμμικτες Ιδιότητες, Τρόποι και Λειτουργίες στην Εκπαίδευση
titleType: AlternativeTitle
Creators: name: Papadopoulou, Agni
name: Panagopoulos, Iakovos
name: Rovithis, Emmanouel
Publisher: name: Kallipos, Open Academic Editions
Year: 2022
Subjects: Τέχνη
Κινηματογράφος
Εκπαίδευση
Αφήγηση
Διαδραστικές τεχνολογίες
Διεπιστημονικότητα
Art
Film
Education
Narration
Interactive technology
Transdisciplinarity

description: Η θεωρητική και πρακτική ενοποίηση παιγνιοποίησης και κινηματογράφησης παρέχει...
description: Η θεωρητική και πρακτική ενοποίηση παιγνιοποίησης και κινηματογράφησης παρέχει έναν εξαιρετικά δημιουργικό τρόπο επίτευξης μαθησιακών στόχων. Η προτεινόμενη προσέγγιση επιτυγχάνει, γιατί εστιάζει σε πρακτικές δημιουργίας. Η θεωρητική ενοποίηση αρχών, μεθοδολογίας, τρόπων, εμπλέκει τη διαδικασία του παιχνιδιού με αυτό που προδιαθέτει τη σύλληψη. Ενίοτε, μπορεί να αποκρύπτει ή να παραχαράσσει πράγματα και καταστάσεις. Οι εικόνες/ιστορίες (ψηφιακών παιχνιδιών, ταινιών) κινούν συναισθηματικά, ενώ επιζητείται η παρατήρηση δομών και οι συναρθρώσεις τους, οι μορφοποιητικοί τρόποι, αναζητώντας την ιδιαιτερότητα της ουσίας, του τρόπου που συγκροτούν οι μαθητές αντιλήψεις, γνώσεις και τις οργανώνουν. Η πρακτική ενοποίηση παιγνιοποίησης και κινηματογράφησης αποσκοπεί στο να αποτρέψει τους μαθητές από κατηγοριοποιήσεις και αυθαίρετες συνδέσεις. Επομένως, ο σχεδιασμός και η παραγωγή μικρού μήκους ταινίας, μέσα από την περιπλάνηση των μαθητών στο κόσμο ψηφιακών παιχνιδιών, είναι ιδιαιτέρως δημιουργική διαδικασία, γιατί αναδύονται υποκειμενικές, κοινωνικές, ηθικές και πολιτικές σκέψεις. Δεν είναι αποστειρωμένες, ουδέτερες, αλλά κατανοούνται εντός μεγαλύτερων κοινωνικών πλαισίων. Μελετάται πώς καταγράφονται και λειτουργούν καταλυτικά. Mε το φακό της κάμερας τονίζονται παραλείψεις σχετικά με τρόπους που δημιουργούν ιεραρχία, ανισότητα, μεροληψίες, αβάσιμους ισχυρισμούς. Το παρόν σύγγραμμα πραγματοποιεί για πρώτη φορά μια τέτοιου είδους δημιουργική προσέγγιση, ανταποκρινόμενο στην ανάγκη, η πραγματικότητα να μην αναπαριστάται, εξιδανικεύεται και να ανατρέπεται. Δομημένο σε δώδεκα κεφάλαια, ξεκινά από περίπλοκες, επιδέξιες κινήσεις, εντός του ψηφιακού κόσμου και καταλήγει στον πραγματικό κόσμο, όπου οι μαθητές βιώνουν και παρίστανται. Με το παιχνίδι και την κινηματογράφηση, οι μαθητές “χαρτογραφούν” και ερευνούν πρακτικές, ριζωμένους τρόπους σκέψης, συμβατικές αφηγήσεις, κανόνες, αποχρωματισμένες διαδικασίες διαπραγματεύσεων, ιδεολογιών και απόψεων.
A Distance Measurement to M33 Using Optical Photometry of Mira Variables
Creators: name: Ou, Jia-Yu
name: Ngeow, Chow-Choong
name: Bhardwaj, Anupam
name: Graham, Matthew J.
name: Laher, Russ R.
name: Masci, Frank J.
name: Riddle, Reed
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a systematic analysis to determine and improve the pulsation periods of 1637 known long-period Mira variables in M33 using $gri$-band light curves spanning $\sim18$~years from several surveys, including M33 variability survey, Panoramic Survey Telescope and Rapid Response System, Palomar Transient Factory (PTF), intermediate PTF, and Zwicky Transient Facility. Based on these collections of light curves, we found that optical band light curves that are as complete as possible are crucial to determine the periods of distant Miras. We demonstrated that the machine learning techniques can be used to classify Miras into O-rich and C-rich based on the $(J-K_s)$ period--color plane. Finally, We derived the distance modulus to M33 using O-rich Miras at maximum light together with our improved periods as $24.67 \pm 0.06$~mag, which is in good agreement with the recommended value given in the literature.
The interactions of the elliptical instability and convection
Creators: name: de Vries, N. B.
name: Barker, A. J.
name: Hollerbach, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The elliptical instability is an instability of elliptical streamlines, which can be excited by large-scale tidal flows in rotating fluid bodies, and excites inertial waves if the dimensionless tidal amplitude ($ε$) is sufficiently large. It operates in convection zones but its interactions with turbulent convection have not been studied in this context. We perform an extensive suite of Cartesian hydrodynamical simulations in wide boxes to explore the interactions of the elliptical instability and Rayleigh-Bénard convection. We find that geostrophic vortices generated by the elliptical instability dominate the flow, with energies far exceeding those of the inertial waves. Furthermore, we find that the elliptical instability can operate with convection, but it is suppressed for sufficiently strong convection, primarily by convectively-driven large-scale vortices. We examine the flow in Fourier space, allowing us to determine the energetically dominant frequencies and wavenumbers. We find that power primarily concentrates in geostrophic vortices, in wavenumbers that are convectively unstable, and along the inertial wave dispersion relation, even in non-elliptically deformed convective flows. Examining linear growth rates on a convective background, we find that convective large-scale vortices suppress the elliptical instability in the same way as the geostrophic vortices created by the elliptical instability itself. Finally, convective motions act as an effective viscosity on large-scale tidal flows, providing a sustained energy transfer (scaling as $ε^2$). Furthermore, we find that the energy transfer resulting from bursts of elliptical instability, when it operates, is consistent with the $ε^3$ scaling found in prior work.
description: 24 pages, 22 figures, 1 table, accepted for publication in Physics of Fluids
Measuring ultrafast time-bin qudits
Creators: name: Bouchard, Frédéric
name: Bonsma-Fisher, Kent
name: Heshami, Khabat
name: Bustard, Philip J.
name: England, Duncan
name: Sussman, Benjamin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Time-bin qudits have emerged as a promising encoding platform in many quantum photonic applications. However, the requirement for efficient single-shot measurement of time-bin qudits instead of reconstructive detection has restricted their widespread use in experiments. Here, we propose an efficient method to measure arbitrary superposition states of time-bin qudits and confirm it up to dimension 4. This method is based on encoding time bins at the picosecond time scale, also known as ultrafast time bins. By doing so, we enable the use of robust and phase-stable single spatial mode temporal interferometers to measure time-bin qudit in different measurement bases.
description: 9 pages, 8 figures
BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
Creators: name: Gagné, Jonathan
name: Lafrenière, David
name: Doyon, René
name: Malo, Lison
name: Artigau, Étienne
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present Bayesian Analysis for Nearby Young AssociatioNs II (BANYAN II), a modified Bayesian analysis for assessing the membership of later-than-M5 objects to any of several Nearby Young Associations (NYAs). In addition to using kinematic information (from sky position and proper motion), this analysis exploits 2MASS-WISE color-magnitude diagrams in which old and young objects follow distinct sequences. As an improvement over our earlier work, the spatial and kinematic distributions for each association are now modelled as ellipsoids whose axes need not be aligned with the Galactic coordinate axes, and we use prior probabilities matching the expected populations of the NYAs considered versus field stars. We present an extensive contamination analysis to characterize the performance of our new method. We find that Bayesian probabilities are generally representative of contamination rates, except when a parallax measurement is considered. In this case contamination rates become significantly smaller and hence Bayesian probabilities for NYA memberships are pessimistic. We apply this new algorithm to a sample of 158 objects from the literature that are either known to display spectroscopic signs of youth or have unusually red near-infrared colors for their spectral type. Based on our analysis, we identify 25 objects as new highly probable candidates to NYAs, including a new M7.5 bona fide member to Tucana-Horologium, making it the latest-type member. In addition, we reveal that a known L2γ dwarf is co-moving with a bright M5 dwarf, and we show for the first time that two of the currently known ultra red L dwarfs are strong candidates to the AB Doradus moving group. Several objects identified here as highly probable members to NYAs could be free-floating planetary-mass objects if their membership is confirmed.
description: 35 pages, 10 figures; accepted for publication in The Astrophysical Journal (in press); Several typographic corrections
Classicalization of inflationary perturbations by collapse models in the light of BICEP2
Creators: name: Das, Suratna
name: Sahu, Satyabrata
name: Banerjee, Shreya
name: Singh, T. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Inflationary and hence quantum origin of primordial perturbations is on a firmer ground than ever post the BICEP2 observations of primordial gravitational waves. One crucial ingredient of success of this paradigm rests on explaining the observed classicality of cosmological inhomogeinities despite their quantum origin. Although decoherence provides a partial understanding of this issue, the question of single outcome motivates the analysis of quantum collapse models in cosmological context which generically modify the dynamics of primordial perturbations and hence can leave their imprints on observables. We revisit one such recently proposed working model of classicalization by spontaneous collapse \cite{Das:2013qwa} in the light of BICEP2 observations to look for possible modifications to tensor power spectra and their implications. We show that it can potentially change the consistency relation of single-field models and a precise measurement of $n_T$ and its running could serve as a test of such dynamics in the early universe.
description: 6 pages, no figure. RevTeX4, v2: References added, Submitted to journal,v3: Minor modification, References added, Accepted for publication in Physical Review D
To What Extent Do Managers’ Practices Contribute Towards Employee Engagement: A Case Study Of A Ministry In The Malta Public Administration
Creators: name: Zammit, Denise
Publisher: name: University of Leicester
Year: 2022
Subjects: Uncategorized

description: Engaged employees invest all their energy in their work to reach organisational objectives. Employees are engaged when they have meaningful work, they feel that the work environment is safe, they are not distracted with internal or external work environments and consequently can invest their energy in work to be psychologically available. Employee engagement can be influenced by various factors including management practices, and the organisational environment. Engaging the employees within the Public Administration can be challenging for managers since the Public Administration is regularised by a legal framework that sometimes restrict the managers to empower, and encourage, the employees to drive work performance. Moreover, the Malta Public Administration where this research has taken place, has experienced restructuring processes within the past years, which have provided an unstable environment for the employees due to change in processes that made it more challenging for the managers to maintain employee engagement. The dissertation aimed to explore the relationship between management practices and employee engagement. The research work focused on establishing the junior employee engagement levels following restructuring processes and investigated how the management practices affected these engagement levels. Furthermore, the research also explored the engaging practices used by the top management within the Ministry to engage the employees as well as, explore, through the top management within the Office of the Prime Minister, the Public Administration planned engagement strategies. The empirical findings established that the management practices have contributed to the moderately engaged junior employees following restructuring processes, and approximately between 20-30% of the junior employees were unhappy with the management engaging practices used within the Ministry. The findings also revealed that only 59% of the employees and managers confirmed commitment to stay within the Ministry for the foreseeable future. In addition, although a significant number of managers have attended for management and leadership training within the PA, the managers felt that they required more training in areas related to soft skills to relate better to the employees.
Monotonicity of the cores of massive stars
Creators: name: Takahashi, Koh
name: Takiwaki, Tomoya
name: Yoshida, Takashi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Massive stars are linked with diverse astronomical processes and objects including star formation, supernovae and their remnants, cosmic rays, interstellar media, and galaxy evolution. Understanding their properties is of primary importance for modern astronomy, and finding simple rules that characterize them is especially useful. However, theoretical simulations have not yet realized such relations, instead finding that the late evolutionary phases are significantly affected by a complicated interplay between nuclear reactions, chemical mixing, and neutrino radiation, leading to non-monotonic initial mass dependencies of the iron core mass and the compactness parameter. We conduct a set of stellar evolution simulations, in which evolutions of He star models are followed until their central densities uniformly reach 10$^{10}$ g cm$^{-3}$, and analyze their final structures as well as their evolutionary properties including the lifetime, surface radius change, and presumable fates after core collapse. Based on the homogeneous data set, we have found that monotonicity is inherent in the cores of massive stars. We show that not only the density, entropy, and chemical distributions, but also their lifetimes and explosion properties such as the proto-neutron-star mass and the explosion energy can be simultaneously ordered into a monotonic sequence. This monotonicity can be regarded as an empirical principle that characterizes the cores of massive stars.
description: 31 pages. Accepted for publication in ApJ
title: Χωρικός Σχεδιασμός: Τεχνικές, Νομικές και Οικονομικές Διαστάσεις
title: Έμφαση στον Ορεινό και τον Θαλάσσιο Χώρο
titleType: AlternativeTitle
title: Χωρικός Σχεδιασμός: Τεχνικές, Νομικές και Οικονομικές Διαστάσεις
title: Έμφαση στον Ορεινό και τον Θαλάσσιο Χώρο
titleType: AlternativeTitle
Creators: name: Giannakopoulou, Stella
name: Arvanitis, Apostolos
Publisher: name: Kallipos, Open Academic Editions
Year: 2022
Subjects: Χωρικός σχεδιασμός
Περιφερειακή ανάπτυξη
Ορεινός χώρος
Θαλάσσιος Χωροταξικός Σχεδιασμός
Κτηματολόγιο
Ιδιοκτησιακό καθεστώς
Περιβαλλοντική / Πολιτιστική Οικονομία
Spatial Planning
Regional Development
Mountainous Areas
Land Tenure
Environmental / Cultural Economics
Marine Spatial Planning
Cadastre

description: Το Βιβλίο «Χωρικός Σχεδιασμός: Τεχνικές, Νομικές και Οικονομικές Διαστάσεις. Έμφαση στον ορεινό και τον θαλάσσιο χώρο» έρχεται να εξυπηρετήσει ...
description: Το Βιβλίο «Χωρικός Σχεδιασμός: Τεχνικές, Νομικές και Οικονομικές Διαστάσεις. Έμφαση στον ορεινό και τον θαλάσσιο χώρο» έρχεται να εξυπηρετήσει δύο ανάγκες: την δημιουργία μαθησιακής υποδομής των προπτυχιακών φοιτητών/τριών του ΤΑΤΜ αλλά και μεταπτυχιακών φοιτητών/τριών τμημάτων των Ελληνικών ΑΕΙ. Το βιβλίο είναι το αποτέλεσμα μιας πρώτης προσπάθειας συλλογής, οργάνωσης και παρουσίασης υλικού, που αφορά σε θέματα χωροταξίας και περιφερειακής ανάπτυξης, που απευθύνονται πρώτιστα σε φοιτητές -ριες του ΤΑΤΜ. Στόχος είναι η εισαγωγή στις και η εξοικείωση των φοιτητών με τις βασικές έννοιες και θεωρίες της ανάπτυξης, του χώρου, του χωροταξικού σχεδιασμού και της περιφερειακής ανάπτυξης. Στόχος είναι, παράλληλα, η παρουσίαση και ανάλυση του υφιστάμενου νομικού πλαισίου για την περιφερειακή ανάπτυξη και τον χωροταξικό σχεδιασμό, στην ΕΕ και στην Ελλάδα. Επιπλέον, στόχο αποτελεί η εμβάθυνση και ανάλυση, υπό την οπτική του χωρικού σχεδιασμού, δύο ιδιαίτερα σημαντικών, για την Ελλάδα, χωρικών ενοτήτων: του βουνού και της θάλασσας. Το βιβλίο διαρθρώνεται σε 12 κεφάλαια: 1. Οι έννοιες της ανάπτυξης και του χώρου, 2. Περιφερειακή πολιτική στην Ευρώπη, 3. Περιφερειακή πολιτική στην Ελλάδα, 4. Χωροταξικός σχεδιασμός στην Ευρώπη, 5. Ο Χωροταξικός σχεδιασμός στην Ελλάδα μέσα από τις Νομοθετικές Ρυθμίσεις, 6.Πολιτική και Χωροταξικός σχεδιασμός στον ορεινό χώρο, 7. Θαλάσσιος χωροταξικός σχεδιασμός, 8.Το ιδιοκτησιακό καθεστώς ως παράμετρος χωρικού σχεδιασμού και ανάπτυξης στον κόσμο, 9. Το ιδιοκτησιακό καθεστώς ως παράμετρος χωρικού σχεδιασμού και ανάπτυξης στην Ελλάδα, 10. Κτηματολόγιο, ανάπτυξη και χωροταξικός σχεδιασμός, 11.Θαλάσσιο Κτηματολόγιο και Θαλάσσιος Χωροταξικός σχεδιασμός, 12. Η περιβαλλοντική και πολιτιστική οικονομία ως εργαλείο περιφερειακής ανάπτυξης. Το βιβλίο συνοδεύεται από αναλυτική βιβλιογραφία. Επίσης όπου απαιτείται θα υπάρχουν υπερσύνδεσμοι τόσο για την μετάβαση σε τμήματα του βιβλίου όσο και για την σύνδεση με σχετικές ιστοσελίδες.
Believability and Harmfulness Shape the Virality of Misleading Social Media Posts
Creators: name: Drolsbach, Chiara
name: Pröllochs, Nicolas
Publisher: name: arXiv
Year: 2023
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Misinformation on social media presents a major threat to modern societies. While previous research has analyzed the virality across true and false social media posts, not every misleading post is necessarily equally viral. Rather, misinformation has different characteristics and varies in terms of its believability and harmfulness - which might influence its spread. In this work, we study how the perceived believability and harmfulness of misleading posts are associated with their virality on social media. Specifically, we analyze (and validate) a large sample of crowd-annotated social media posts from Twitter's Birdwatch platform, on which users can rate the believability and harmfulness of misleading tweets. To address our research questions, we implement an explanatory regression model and link the crowd ratings for believability and harmfulness to the virality of misleading posts on Twitter. Our findings imply that misinformation that is (i) easily believable and (ii) not particularly harmful is associated with more viral resharing cascades. These results offer insights into how different kinds of crowd fact-checked misinformation spreads and suggest that the most viral misleading posts are often not the ones that are particularly concerning from the perspective of public safety. From a practical view, our findings may help platforms to develop more effective strategies to curb the proliferation of misleading posts on social media.
description: Accepted at WWW 23
Blue-Cloud D5.3 Blue-Cloud Services Uptake Report
Creators: name: Giuffrida, Rita
name: Pittonet, Sara
name: Obaton, Dominique
Publisher: name: Zenodo
Year: 2023
Subjects: Data Discovery and Access Service
Research Infrastructure
VLab
Virtual Research Environment

description: Blue-Cloud has achieved significant results since the start of the Blue-Cloud project in October 2019. The Blue-Cloud Open Science platform introduced a "de facto" federation taking place at 3 levels: the data, the computing resources and the analytical services. For each of them Blue-Cloud orchestrated mechanisms that successfully established interoperability and resulted in a Data Discovery and Access Service, the Virtual Research Environment and five Virtual Laboratories providing access to 15 services. Blue-Cloud working environments are serving more than 1,300 users in total spread across 20 countries. Up to mid February 2023, more than 42,100 working sessions have been executed, with an average of 1,027 working sessions per month and an average of 294 working analytics sessions executed every month by the users of the VLabs. 
This document gives an overview of the main services released by the project - the Virtual Research Environment, the five VLabs and the Data Discovery and Access services - and for each of them presents the main target users, the exploitation of the services. Statistics about the growth of users is presented, with explanations commenting on the type of services exploited and reasons behind the evolution of the user base as well as on the works performed. 
The document also highlights the exploitation potential for the Blue-Cloud services, detailing what scientific advances the solutions introduced can offer to the wider marine community, and what type of usage can be done for the services when coupled with other applications and solutions, additional datasets and exported to other communities. For those Virtual labs whose services and datasets were exploited by the participants to the Blue-Cloud hackathon, a short overview of the main outcomes is also provided, since the work that these teams performed is illustrative of the potential impact that can be generated thanks to the exploitation of the Blue-Cloud infrastructure. 
Chapter 1 illustrates the overall usage and uptake of the Blue-Cloud open science platform by its partners 
Chapter 2 is dedicated to the uptake and exploitation of the services offered by the Blue-Cloud demonstrators as part of their Virtual Laboratories 
Chapter 3 illustrates the usage of the Data Discovery and Access Service 
Chapter 4 introduces the exploitation potential linked to the usage of the solutions by third party communities, such in the case of the JERICO Research Infrastructure.
STAGES OF GRADUAL DEVELOPMENT OF RELIGIOUS EXTREMIST ACTIVITY
Creators: name: Nurumbetova Sadokat Allayarovna
Publisher: name: Zenodo
Year: 2023

description: The article provides an overview and summary of extremist activity and its history. It emphasizes the periodic criteria for the origin of extremism, commenting on the historical stages of their activities. The effects of extremist activities are also discussed, followed by radicalization and the reasons for joining extremist groups. Then the main events and groups of various extremist movements are considered. The discussion examines the problematic aspects of identifying and combating extremism and the problems of recommendation proposals. The conclusion summarizes the main points and emphasizes that understanding the roots and evolution of extremism is important in the development of effective prevention and countermeasures.
Scaling relations of X-ray Luminous Clusters in the Hyper Suprime-Cam Subaru Strategic Program Field
Creators: name: Poon, Helen
name: Okabe, Nobuhiro
name: Fukazawa, Yasushi
name: Akino, Daiichi
name: Yang, Chong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the XMM-Newton X-ray analysis of 19 X-ray luminous galaxy clusters of low-to-mid redshift ($< 0.4$) selected from the MCXC cluster catalogue in the Hyper Supri%survey as the first work in our series paper. We derive the hydrostatic equilibrium mass and study scaling relations using i) the whole sample, ii) only relaxed clusters and iii) only disturbed clusters. When considering the whole sample, the $Y_{\rm X}$-$M_{\rm tot}$ and $M_{\rm gas}$-$M_{\rm tot}$ relations agree with self-similarity. In terms of morphology, relaxed clusters show a flatter relation in $L_{\rm X,ce}$-$M_{\rm tot}$, $L_{\rm X,bol}$-$M_{\rm tot}$, $L_{\rm X,ce}$-$T$, $L_{\rm bol,ce}$-$T$, $M_{\rm gas}$-$M_{\rm tot}$ and $Y_{\rm X}$-$M_{\rm tot}$. The $L_{\rm bol,ce}$-$M_{\rm tot}$, $L_{\rm X,ce}$-$M_{\rm tot}$ $L_{\rm bol,ce}$-$T$ and $L_{\rm X,ce}$-$T$ relations show a slope $\sim$3$σ$ steeper. The residuals in the $M_{\rm gas}$-$M_{\rm tot}$ and $T$-$M_{\rm tot}$ relations and the intrinsic covariance between $M_{\rm gas}$ and $T$ show hints of positive correlation, casting doubt on whether the $Y_{\rm X}$ parameter is a truly low scatter mass proxy. The $M_{\rm gas}$-$M_{\rm tot}$ and $T$-$M_{\rm tot}$ plots color-coded with the offset of the $L_{\rm X,ce}$-$M_{\rm tot}$ relation show these two relations to be brightness dependent but not the $L_{\rm X,ce}$-$T$ relation, suggesting relations involving $M_{\rm tot}$ are biased due to sample selection based on luminosity. Following the work which studied an optical sample and combining our result with literature studies, we find the $M_{\rm tot}$ derived not using mass proxies deviate from $L_{\rm X}$ $\propto$ $M_{\rm gas}^{2}M_{\rm tot}^{-1}$ and $M_{\rm tot}$ based on hydrostatic equilibrium are more massive than what is expected by their relation using caustic masses. This indicates mass bias plays an important role in scaling relations.
description: Accepted for publication in MNRAS, 16 pages, 19 figures
Density jump as a function of magnetic field strength for parallel collisionless shocks with anisotropic upstream pressure
Creators: name: Bret, Antoine
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The properties of collisionless shocks are frequently assessed in the magnetohydrodynamics (MHD) model. Yet, in a collisionless plasma, an ambient magnetic field can sustain a stable anisotropy in the upstream or the downstream, resulting in a departure from the MHD predicted behavior. We present a model allowing to derive the downstream anisotropy, hence the shock density jump, in terms of the upstream quantities. For simplicity, the case of a parallel shock in pair plasma is considered. Contrary to previous works where the upstream was assumed isotropic, here the upstream anisotropy $A=T_\perp/T_\parallel$ is a free parameter. The strong sonic shock regime is formally identical to the isotropic upstream case. Yet, for intermediate sonic Mach numbers, a variety of behaviors appear as a result of the anisotropy of the upstream.
description: To appear in MNRAS, 8 pages, 6 figures
Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation
Creators: name: Heesen, V.
name: O'Sullivan, S. P.
name: Brüggen, M.
name: Basu, A.
name: Beck, R.
name: Seta, A.
name: Carretti, E.
name: Krause, M. G. H.
name: Haverkorn, M.
name: Hutschenreuter, S.
name: Bracco, A.
name: Stein, M.
name: Bomans, D. J.
name: Dettmar, R. -J.
name: Chyży, K. T.
name: Heald, G. H.
name: Paladino, R.
name: Horellou, C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. The existence of magnetic fields in the circumgalactic medium (CGM) is largely unconstrained. Their detection is important as magnetic fields can have a significant impact on the evolution of the CGM and, in turn, the fields can serve as tracers for dynamical processes in the CGM. Aims. With Faraday rotation of polarised background sources, we aim to detect a possible excess of the rotation measure in the surrounding area of nearby galaxies. Methods. We use 2,461 residual rotation measures (RRMs) observed with the LOw Frequency ARray (LOFAR), where the foreground contribution from the Milky Way is subtracted. The RRMs are then studied around a subset of 183 nearby galaxies that was selected by apparent $B$-band magnitude. Results. We find that, in general, the RRMs show no significant excess for small impact parameters (i.e. the perpendicular distance to the line of sight). However, if we only consider galaxies at higher inclination angles and sight lines that pass close to the minor axis of the galaxies, we find significant excess at impact parameters of less than 100 kpc. The excess in |RRM| is 3.7 $\rm rad\,m^{-2}$ with an uncertainty between $\pm 0.9~\rm rad\,m^{-2}$ and $\pm 1.3~\rm rad\,m^{-2}$ depending on the statistical properties of the background (2.8$σ$-4.1$σ$). With electron densities of ~$10^{-4}~\rm cm^{-3}$ this suggests magnetic field strengths of a few tenths of a micro Gauss. Conclusions. Our results suggest a slow decrease of the magnetic field strength with distance from the galactic disc such as expected if the CGM is magnetised by galactic winds and outflows.
description: 5 pages, 4 figures, accepted as Letter to Astronomy and Astrophysics