cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Η σχέση της περίσκεψης και της κοινωνικής υποστήριξης με την ψυχική ανθεκτικότητα στα εξαρτημένα από το τζόγο και αλκοόλ άτομα
Creators: name: Χρυσανθίδου, Άννα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανθεκτικότητα
Περίσκεψη
Κοινωνική υποστήριξη
Resilience
Mindfulness
Social support

description: Η παρούσα έρευνα εξετάζει τη σχέση της περίσκεψης και της κοινωνικής υποστήριξης με την ανθεκτικότητα εξαρτημένων ατόμων από το τζόγο και το αλκοόλ. Συνολικά συμμετείχαν 72 άτομα που ήταν εξυπηρετούμενοι του ΚΕΘΕΑ ΑΛΦΑ. Στους συμμετέχοντες δόθηκαν ερωτηματολόγια για την αξιολόγηση της ανθεκτικότητας (Κλίμακα Ψυχικής Ανθεκτικότητας) και της περίσκεψης (Κλίμακα Επίγνωσης Προσοχής και Συνείδησης) καθώς επίσης και για την κοινωνική υποστήριξη (Ερωτηματολόγιο Κοινωνικής Υποστήριξης). Τα αποτελέσματα έδειξαν ότι υπάρχει θετική συσχέτιση μεταξύ της περίσκεψης και της ανθεκτικότητας. Βρέθηκε επίσης μικρή θετική συσχέτιση ανάμεσα στο βαθμό ικανοποίησης από την παρεχόμενη κοινωνική υποστήριξη και την ανθεκτικότητα. Επιπλέον, βρέθηκε ότι η αυξημένη ικανοποίηση από την υποστήριξη που λαμβάνουν συνδέεται με αυξημένη περίσκεψη. Επίσης, βρέθηκαν διαφορές ανάμεσα στα δύο φύλα όσον αφορά την περίσκεψη. Συγκεκριμένα, βρέθηκε ότι οι άντρες είχαν την τάση να λειτουργούν με περισσότερη περίσκεψη από ότι οι γυναίκες. Τέλος, βρέθηκε ότι η περίσκεψη προβλέπει την ανθεκτικότητα. Καταλήγοντας, η περίσκεψη και η κοινωνική υποστήριξη επηρεάζουν την ανθεκτικότητα, η οποία είναι σημαντική για τη θεραπεία της εξάρτησης. Χρειάζεται λοιπόν να λαμβάνονται υπόψη αυτοί οι παράμετροι αφού μπορεί να επηρεάσουν την θεραπεία των εξαρτημένων ατόμων.
description: The current study examines the relationship between mindfulness and social support with the resilience of people addictive in gambling and alcohol. A total of 72 individuals participated in the study. All participants were attending therapy programs in KETHEA ALPHA. Questionnaires were administered in order to assess participants’ resilience (Connor-Davidson Resilience Scale), mindfulness (Mindfulness Attention and Awareness Scale), and social support (Sarason’s Social Support Questionnaire). Results showed that there was a significant relationship between mindfulness and resilience. Also, a significant relationship was found between the degree of satisfaction from the provided social support and resilience. In addition, increased satisfaction from social support was related with increased mindfulness. Furthermore, it was found that there are gender differences in mindfulness. In particular, men were found to be more mindful than women. Lastly, it was revealed that there is a positive predictive relationship between mindfulness and resilience. Concluding, mindfulness and social support are related with resilience, which is crucial for addiction’s therapy. It is therefore necessary to take these parameters into account since they can affect the treatment of addictive people.
description: Σε συνεργασία με: Πανεπιστήμιο Λευκωσίας (Κύπρος)
Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
Creators: name: Bulgac, Aurel
name: Forbes, Michael McNeil
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The equation of state of a dilute two-component asymmetric Fermi gas at unitarity is subject to strong constraints, which affect the spatial density profiles in atomic traps. These constraints require the existence of at least one non-trivial partially polarized (asymmetric) phase. We determine the relation between the structure of the spatial density profiles and the T=0 equation of state, based on the most accurate theoretical predictions available. We also show how the equation of state can be determined from experimental observations.
description: 10 pages and 7 figures. (Minor changes to correspond with published version.)
Decay Processes in the Presence of Thin Superconducting Films
Creators: name: Rekdal, Per K.
name: Skagerstam, Bo-Sture K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a recent paper [Phys. Rev. Lett. 97, 070401 (2006)] the transition rate of magnetic spin-flip of a neutral two-level atom trapped in the vicinity of a thick superconducting body was studied. In the present paper we will extend these considerations to a situation with an atom at various distances from a dielectric film. Rates for the corresponding electric dipole-flip transition will also be considered. The rates for these atomic flip transitions can be reduced or enhanced, and in some situations they can even be completely suppressed. For a superconducting film or a thin film of a perfect conducting material various analytical expressions are derived that reveals the dependence of the physical parameters at hand.
description: 5 pages, 2 figures
A Quick Look at the $3\,$GHz Radio Sky I. Source Statistics from the Very Large Array Sky Survey
Creators: name: Gordon, Yjan A.
name: Boyce, Michelle M.
name: O'Dea, Christopher P.
name: Rudnick, Lawrence
name: Andernach, Heinz
name: Vantyghem, Adrian N.
name: Baum, Stefi A.
name: Bui, Jean-Paul
name: Dionyssiou, Mathew
name: Safi-Harb, Samar
name: Sander, Isabel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Very Large Array Sky Survey (VLASS) is observing the entire sky north of $-40^{\circ}$ in the S-band ($23\,$mJy/beam and are often unreliable for fainter components. We use this catalog to perform statistical analyses of the $ν\sim 3\,$GHz radio sky. Comparisons with the Faint Images of the Radio Sky at Twenty cm survey (FIRST) show the typical $1.4-3\,$GHz spectral index, $α$, to be $\sim-0.71$. The radio color-color distribution of point and extended components is explored by matching with FIRST and the LOFAR Two Meter Sky Survey. We present the VLASS source counts, $dN/dS$, which are found to be consistent with previous observations at $1.4$ and $3\,$GHz. Resolution improvements over FIRST result in excess power in the VLASS two-point correlation function at angular scales $\lesssim 7''$, and in $18\,\%$ of active galactic nuclei associated with a single FIRST component being split into multi-component sources by VLASS.
description: Accepted for publication in ApJS; 23 pages, 18 figures, 4 tables. Revised version includes new flux calibration (section 3.2) that results in VLASS fluxes being scaled by 15% in the presented analyses rather than the 10% used in the earlier version. Associated VLASS catalog data available at https://cirada.ca/catalogues
Cuprate superconductors as viewed through a striped lens
Creators: name: Tranquada, J. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Understanding the electron pairing in hole-doped cuprate superconductors has been a challenge, in particular because the "normal" state from which it evolves is unprecedented. Now, after three and a half decades of research, involving a wide range of experimental characterizations, it is possible to delineate a clear and consistent cuprate story. It starts with doping holes into a charge-transfer insulator, resulting in in-gap states. These states exhibit a pseudogap resulting from the competition between antiferromagnetic superexchange $J$ between nearest-neighbor Cu atoms (a real-space interaction) and the kinetic energy of the doped holes, which, in the absence of interactions, would lead to extended Bloch-wave states whose occupancy is characterized in reciprocal space. To develop some degree of coherence on cooling, the spin and charge correlations must self-organize in a cooperative fashion. A specific example of resulting emergent order is that of spin and charge stripes, as observed in La$_{2-x}$Ba$_x$CuO$_4$. While stripe order frustrates bulk superconductivity, it nevertheless develops pairing and superconducting order of an unusual character. The antiphase order of the spin stripes decouples them from the charge stripes, which can be viewed as hole-doped, two-leg, spin-$\frac12$ ladders. To achieve superconducting order, the pair correlations in neighboring ladders must develop phase order. In the presence of spin stripe order, antiphase Josephson coupling can lead to pair-density-wave superconductivity. Alternatively, in-phase superconductivity requires that the spin stripes have an energy gap, which empirically limits the coherent superconducting gap. Hence, superconducting order in the cuprates involves a compromise between the pairing scale, which is maximized at $x\sim\frac18$, and phase coherence, which is optimized at $x\sim0.2$.
description: 74 pages, 24 figures; This article has been accepted for publication in Advances in Physics, published by Taylor & Francis; includes significant revisions and additions
Introduzione
Creators: name: Bettin Lattes, Gianfranco
name: Bello, Valeria
name: Santacreu, Oscar
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Πράγματα κοινής χρήσης και Εθνικό Κτηματολόγιο
Creators: name: Σταυρίδου, Ευαγγελία Πελάγιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Κοινόχρηστα πράγματα
Προσωπικότητα
Κοινόχρηστος χαρακτήρας
Things of common use
Personality
Common nature

description: Στην παρούσα μελέτη αρχικά επιχειρείται η ανάλυση της έννοιας των κοινοχρήστων πραγμάτων, όπως αυτά ορίζονται στην ΑΚ 967. Έτσι γίνεται αναφορά στην περιπτωσιολογία των κοινής χρήσης πραγμάτων, όπως τη συναντάμε στην διάταξη του άρθρου 967 του Αστικού μας Κώδικα, στη συνέχεια εξετάζονται οι τρόποι καθιέρωσης ενός πράγματος ως κοινόχρηστου, περαιτέρω γίνεται αναφορά στην κτήση του δικαιώματος κυριότητας επί κοινοχρήστου πράγματος και των εννόμων σχέσεων που αναπτύσσονται σε αυτό με ανάλυση της νομικής βάσης προστασίας της κοινοχρησίας, ως ειδικότερης έκφανσης του δικαιώματος προσωπικότητας σε περίπτωση προσβολής του. Εν κατακλείδι, εξετάζονται τα ιδιωτικά δικαιώματα που δύνανται να ασκηθούν επί των πραγμάτων κοινής χρήσης και τέλος οι τρόποι αποβολής του κοινόχρηστου χαρακτήρα του πράγματος.
description: In the present study we are initially attempting to analyze the notion of things of common use as defined in the article 967 of our Civil Code. Thus, reference is made to the case of things of common use, as found in the provision of the above article, then we examine the ways of establishing a thing as common, in addition reference is made to the acquisition of the right of ownership over a common thing and the legal relations developed therein by an analysis of the legal basis of protection of the sharing, as a more specific facet of personality rights in the case of an offense. In conclusion, private rights that can be exercised on sharing things are examined, and finally the ways of eliminating the shared nature of the thing.
Σχεδιασμός εκπαιδευτικού υλικού για τους υγροτόπους: Η περίπτωση του υγροτόπου της Επανομής
Creators: name: Χατζηνικολάου, Νιόβη Θεοδοσίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: υγρότοποι
εκπαιδευτικό υλικό
αειφόρος ανάπτυξη
wetlands
educational material
sustainable development

description: Η παρούσα εργασία διαπραγματεύεται τη δημιουργία εκπαιδευτικού υλικού για τον υγρότοπο της Επανομής, Νομού Θεσσαλονίκης. που μπορεί να χρησιμοποιηθεί από τους εκπαιδευτικούς στο σχεδιασμό προγραμμάτων περιβαλλοντικής εκπαίδευσης για τον υγρότοπο. Το εκπαιδευτικό υλικό αποτελείται από δύο μέρη. Το πρώτο μέρος περιλαμβάνει το πληροφοριακό υλικό σχετικά με τον υγρότοπο (πληροφορίες για την βιοποικιλότητα της περιοχής, τα καθεστώτα προστασίας της, τις απειλές) και τη σημασία του για τη διατήρηση προστατευόμενων ειδών πουλιών. Το δεύτερο μέρος περιλαμβάνει ένα σύνολο προτεινόμενων δραστηριοτήτων που περιλαμβάνουν βιωματικές δράσεις στο πεδίο και προωθούν την ομαδική εργασία, την ενεργό εμπλοκή και συμμετοχή και την καλλιέργεια κριτικών δεξιοτήτων. Το εκπαιδευτικό υλικό αναφέρεται σε μαθητές γυμνασίου. Λειτουργεί ως ένας οδηγός για τον εκπαιδευτικό που έχει ως στόχο την ευαισθητοποίηση των μαθητών σχετικά με τη σημαντική ορνιθοπανίδα του υγρότοπου της Επανομής, τις απειλές από την ανθρώπινη δραστηριότητα που συνιστούν περιβαλλοντικό πρόβλημα και την ανάγκη για αειφορική διαχείριση του υγροτόπου με σκοπό τη διατήρηση της φυσιογνωμίας του στο μέλλον. Ακολουθεί η αξιολόγηση του εκπαιδευτικού υλικού, μέσω ερωτηματολογίων, από εκπαιδευτικούς που διδάσκουν σε γυμνάσιο
description: The present work introduces the development of educational material entitled: “Designing educational material for wetlands-The case of Epanomi wetland”. The material consists of two parts. The first part provides the educator with information about the wetland (information about the biodiversity, protection policy and threats) and highlights the importance of the wetland for numerous protected bird species. The second part contains a series of proposed environmental education activities for students. The activities make use of the experiences of the students, promote outdoor learning, teamwork, active involvement and participation and enhance the development of critical thinking skills. The material is aimed at junior high school students. Educators can use this material as a guide to raise students’ awareness over the wetland’s rich biodiversity and human activities that lead to its degradation as well as emphasize the need for a sustainable management that will ensure its protection and preservation. At the final stage of the material development, we attempt an assessment of the material by junior high school educators
Bayesian estimation of the specific shear and bulk viscosity of the quark-gluon plasma with additional flow harmonic observables
Creators: name: Parkkila, J. E.
name: Onnerstad, A.
name: Kim, D. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The transport properties of the strongly-coupled quark-gluon plasma created in ultra-relativistic heavy-ion collisions are extracted by Bayesian parameter estimate methods with the latest collision beam energy data from LHC. This Bayesian analysis includes sophisticated flow harmonic observables for the first time. We found that the temperature dependence of specific shear viscosity shows weaker than the previous studies. The results prefer a lower value of specific bulk viscosity and a higher switching temperature to reproduce additional observables. However, the improved statistical uncertainties both on the experimental data and hydrodynamic calculations with additional observables do not help to reduce the final credibility ranges much, indicating a need for improving the dynamical collision model before the hydrodynamic takes place. In addition, the sensitivities of experimental observables to the parameters in hydrodynamic model calculations are quantified. It is found that the analysis benefits most from the symmetric cumulants and non-linear flow modes, which mostly reflect non-linear hydrodynamic responses, in constraining the temperature dependence of the specific shear and bulk viscosity in addition to the previously used flow coefficients.
Μέθοδοι Επαναδειγματοληψίας και Εφαρμογές
Creators: name: Κεσεσίδου, Γεωργία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Μέθοδοι Επαναδειγματοληψίας
Bootstrap
Permutation test
Resampling Methods

description: Στη παρούσα διπλωματική εργασία, η οποία εκπονήθηκε στα πλαίσια του Μεταπτυχιακού προγράμματος «Στατιστική και Μοντελοποίηση» του τμήματος Μαθηματικών του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης, περιγράφονται κάποιες από τις νεότερες τεχνικές επαναδειγματοληψίας που εφαρμόζονται κυρίως σε ιατρικές επιστήμες αλλά και σε έρευνες οικονομικού ενδιαφέροντος. Αρχικά παρουσιάζετε η τεχνική επαναδειγματοληψίας Bootstrap, ως μέθοδος εκτίμησης του τυπικού σφάλματος και της μεροληψίας της εκτιμήτριας συνάρτησης που έχει υπολογισθεί για μία άγνωστη παράμετρο του Πληθυσμού. Επιπλέον στο πρώτο κεφάλαιο αναλύεται ο τρόπος κατασκευής διαστημάτων εμπιστοσύνης με τη μέθοδο Bootstrap. Στη συνέχεια περνάμε από το θεωρητικό κομμάτι στο πρακτικό, παραθέτοντας μία εφαρμογή της τεχνικής αυτής σε τυχαία δείγματα. Ακολουθεί η περιγραφή των Permutation tests, μία από της πιο σημαντικές και ευρέως εφαρμόσιμες τεχνικές επαναδειγματοληψίας στον τομέα της πειραματικής ιατρικής, η οποία άνθισε με την εξέλιξη των σύγχρονων υπολογιστών. O τρόπος λειτουργίας ενός Permutation testαναλύεται εκτενέστερα στο δεύτερο κεφάλαιο τόσο σε θεωρητικό επίπεδο όσο και σε πρακτικό. Τέλος στο τρίτο κεφάλαιο, συστήνουμε τη μέθοδο Bootstrap ως εργαλείο για τον έλεγχο υποθέσεων.H εργασία ολοκληρώνεται με την παρουσίαση μιας εναλλακτικής προσέγγισης της μεθόδου bootstrap, την οποία και εφαρμόζουμε στον έλεγχο υποθέσεων
description: This thesis present some of the most recent resampling techniques that are applied mainly in medical sciences as well as in surveys of economic interest are described. Initially, we present the Bootstrap resampling technique as a method of calculation the standard error and bias of the estimator function calculated for an unknown parameter of the Population. In addition, the first chapter discusses how to build confidence intervals with the Bootstrap method. Then we pass from the theoretical part to the practice, quoting an application of this technique in random samples. Below is the description of Permutation tests, one of the most important and widely applicable resampling techniques in the field of experimental medicine, which flourished with the evolution of modern computers. The mode of operation of a Permutation test is further analyzed in the second chapter, both theoretically and practically. Finally, in Chapter Three, we recommend the Bootstrap method as a tool for hypothesis testing and the thesis is completed by presenting an alternative approach to the bootstrap method, which we apply to a hypothesis test
Cascade of phase transitions in a planar Dirac material
Creators: name: Kanazawa, Takuya
name: Kieburg, Mario
name: Verbaarschot, Jacobus J. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate a model of interacting Dirac fermions in $2+1$ dimensions with $M$ flavors and $N$ colors having the $\mathrm{U}(M)\times \mathrm{SU}(N)$ symmetry. In the large-$N$ limit, we find that the $\mathrm{U}(M)$ symmetry is spontaneously broken in a variety of ways. In the vacuum, when the parity-breaking flavor-singlet mass is varied, the ground state undergoes a sequence of $M$ first-order phase transitions, experiencing $M+1$ phases characterized by symmetry breaking $\mathrm{U}(M)\to \mathrm{U}(M-k)\times \mathrm{U}(k)$ with $k\in\{0,1,2,\cdots,M\}$, bearing a close resemblance to the vacuum structure of three-dimensional QCD. At finite temperature and chemical potential, a rich phase diagram with first and second-order phase transitions and tricritical points is observed. Also exotic phases with spontaneous symmetry breaking of the form as $\mathrm{U}(3)\to \mathrm{U}(1)^3$, $\mathrm{U}(4)\to \mathrm{U}(2)\times \mathrm{U}(1)^2$, and $\mathrm{U}(5)\to \mathrm{U}(2)^2\times \mathrm{U}(1)$ exist. For a large flavor-singlet mass, the increase of the chemical potential $μ$ brings about $M$ consecutive first-order transitions that separate the low-$μ$ phase diagram with vanishing fermion density from the high-$μ$ region with a high fermion density.
description: 44 pages. v2: references added
The Surface response around a sharply resonant surface polariton mode is simply a Lorentzian
Creators: name: Carvalho, J. C. de Aquino
name: Bloch, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: At the planar interface between a material and vacuum, the complex surface response S(omega)=[eps(omega) 1]/[eps(omega)+1], with eps(omega) the relative complex dielectric permittivity of the material, exhibit resonances, typical of the surface polariton modes, when eps(omega) ~ 1. We show that for a moderately sharp resonance, S(omega) is satisfactorily described with a mere (complex) Lorentzian, independently of the details affecting the various bulk resonances describing ) eps(omega). Remarkably, this implies a quantitative correlation between the resonant behaviors of Re[S(omega)] and Im[S(omega)], respectively associated to dispersive and dissipative effects in the surface near-field. We show that this "strong resonance" approximation easily applies, and discuss its limits, based upon published data for sapphire, CaF2 and BaF2. Extension to interfaces between two media or to a non planar interface is briefly considered.
description: accepted for publication in Optics Letters
Antiausteridad y protesta en el contexto de la crisis económica y política en España e Italia
Creators: name: Raffini, Luca
name: Penalva, Clemente
name: Alaminos, Antonio
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: The crisis affecting European Union, and especially Mediterranean countries, is both an economic and a political crisis. In a broad sense, we can look at the crisis as the result of an internal crisis of the neoliberal model, exacerbating the perceived subordination of politics to the economy, and therefore the deficit of legitimacy and involvement that characterizes both European and national institutions. The decline in support for traditional political organizations and reduction of conventional political participation is accompanied by a process of reinvention of politics, which takes form in grass-root, non conventional participation. New political actors challenge economic and political institution and claim for a renewal of democracy and for a new relation between economy and politics. The article, after comparing steps and dimension of crisis, explores the characteristics of anti- austerity movements in Spain and in Italy, analyzing differences and similarities. Finally, we locate the movilization occurred in these two countries within the context of the global cycles of protest.
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Semejanzas y diferencias entre el Movimento 5 stelle y Podemos
Creators: name: Rodríguez-Aguilera De Prat, Cesáreo
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: The severe economic crisis that began in 2008 has encouraged the new emergence of protest parties in some European countries. The erosion of traditional politics has been capitalized by populist oriented movements: in the Italian case the Movimento 5 Stelle and in the Spanish case Podemos. The goal of this contribution is the analysis of the causes, organizational trajectories, leadership structures, social bases and ideological and programmatic issues of both parties. The M5S and Podemos have strategic and ideological differences, but share the radical criticism of the “system” which they disqualify outright.
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Two-fluid stellar objects in General Relativity: the covariant formulation
Creators: name: Naidu, Nolene F.
name: Carloni, Sante
name: Dunsby, Peter
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the 1+1+2 covariant approach to describe a general static and spherically symmetric relativistic stellar object which contains two interacting fluids. We then use the 1+1+2 equations to derive the corresponding Tolman-Oppenheimer-Volkoff (TOV) equations in covariant form in the isotropic, non-interacting case. These equations are used to obtain new exact solutions by means of direct resolution and reconstruction techniques. Finally, we show that the generating theorem known for the single fluid case can also be used to obtain two-fluid solutions from single fluid ones.
description: 19 pages, 14 figures
Los medios de comunicación y el Arca de Noè: la sociología del futuro
Creators: name: Bouza, Fermín
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: Construction of modernity brings a new individualism and a constant presence of the media. The new individuals are giving the construction of the public agenda to the media, who interpret the theory of ongoing economic crisis, which has forced us to rethink the economic and political order. The metaphor of Noah’s Ark is used to visualize a situation where we must seriously begin to choose what to keep of the current scrap. The sociology of the future, as the Ark, should evaluate this modern history and help build a possible plan for a livable future.
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Network Quantum Steering
Creators: name: Jones, Benjamin D. M.
name: Šupić, Ivan
name: Uola, Roope
name: Brunner, Nicolas
name: Skrzypczyk, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The development of large-scale quantum networks promises to bring a multitude of technological applications as well as shed light on foundational topics, such as quantum nonlocality. It is particularly interesting to consider scenarios where sources within the network are statistically independent, which leads to so-called network nonlocality, even when parties perform fixed measurements. Here we promote certain parties to be trusted and introduce the notion of network steering and network local hidden state (NLHS) models within this paradigm of independent sources. In one direction, we show how results from Bell nonlocality and quantum steering can be used to demonstrate network steering. We further show that it is a genuinely novel effect, by exhibiting unsteerable states that nevertheless demonstrate network steering, based upon entanglement swapping, yielding a form of activation. On the other hand, we provide no-go results for network steering in a large class of scenarios, by explicitly constructing NLHS models.
description: 11 pages, 6 figures
Comparare Spagna e Italia: alcune riflessioni sulle implicazioni metodologiche della comparazione tra due paesi storicamente connessi
Creators: name: De Nardis, Fabio
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: Is it any use to compare two nations such as Spain and Italy? Why not extend it to other nations? Or, conversely, why not dwell on one of the two cases by analyzing it in depth? These three simple questions require a careful reflection on the logic of comparison in the social sciences. In the construction of a research design, the comparatist must in fact solve some methodological tangles by establishing: 1) the «unit (or units) of analysis» on which the research should be oriented; 2) The space-temporal context in which the research ranks; 3) the conceptual definition of properties (or variables). These three operations have some methodological implications which require an effort of conceptualization and classification necessary for a proper comparative research. In addition, researchers must make a clear strategic choice with respect to their empirical path. After determining the research field, it is necessary to cope with the problem of choosing the most appropriate units to be selected as a sample. The choice to compare two countries similar in many respects and historically connected such as Spain and Italy assumes the use of the so-called strategy of “most similar systems design”. It is useful to solve the problem of the “diffusion” and to reduce the unwanted historical associations. Starting from these reflections, the aim of this paper is to analyze the methodological implications of the comparison between the two countries under study.
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Magnetic properties on the boundary of an evolving pore
Creators: name: García-Rivas, M.
name: Jurcak, J.
name: González, N. Bello
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Analyses of magnetic properties on umbrae boundaries led to the Jurcak criterion, which states that umbra-penumbra boundaries in stable sunspots are equally defined by a constant value of the vertical magnetic field, Bver_crit, and by 0.5 continuum intensity of the quiet Sun, Iqs. Umbrae with vertical magnetic fields stronger than Bver_crit are stable, whereas umbrae with vertical magnetic fields weaker than Bver_crit are unstable and prone to vanishing. Aims. To investigate the existence of a critical value of the vertical magnetic field on a pore boundary and its role in the evolution of the magnetic structure. Methods. We analysed SDO/HMI vector field maps corrected for scattered light with a temporal cadence of 12 min during a 26.5-hour period. An intensity threshold (Ic = 0.55 Iqs) is used to define the pore boundary and temporal evolutions of the magnetic properties are studied there. Results. We observe stages in the pore evolution: (1)during an initial formation phase, total magnetic field strength (B) and vertical magnetic field (Bver) increase to their maximum values of ~1920 G and ~1730 G, respectively; (2)then the pore reaches a stable phase; (3)in a second formation phase, the pore undergoes a rapid growth in size, along with a decrease in B and Bver on its boundary. In the newly formed area, Bver remains mostly below 1731 G and B remains everywhere below 1921 G; (4)ultimately, pore decay starts. We find overall that pore areas with Bver<1731 G, or equivalently B<1921 G, disintegrate faster than regions that fulfil this criteria. Conclusions. The most stable regions of the pore, similarly to the case of umbral boundaries, are defined by a critical value of Bver that is comparable to that found in stable sunspots. In addition, in this case study, the same pore areas can be similarly well-defined by a critical value of the total magnetic field strength.
description: 7 pages, 4 figures, final version published by A&A. Solved issue with coordinates
The pseudo scalar form factor of the nucleon, the sigma-like term, and the $L_0^+$ amplitude for charged pion electro-production near threshold
Creators: name: Cheoun, Myung Ki
name: Kim, K. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The pseudo scalar form factor, which represents the pseudo scalar quark density distribution due to finite quark masses on the nucleon, is shown to manifest itself with the induced pseudo scalar form factor in the $L_0^+$ amplitude for the charged pion electro-production. Both form factors show their own peculiar momentum dependence. Under the approximation on which the Goldberg-Treimann relation holds, a sum of both form factors' contributions accounts for the t-channel contribution in the charged pion electro-production near threshold.
description: 10 pages
Persistenze, transizioni e problematiche storiografiche tra Spagna e Italia (secc. XVI-XXI). Una relazione che dura un’eternità?
Creators: name: Pilo, Rafaella
name: Scroccu, Gianluca
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: The objective of this paper is to highlight reasons and effects of the longue durée on the close relationship that linked Italian and Spanish nations. We aim at focusing on changes, but also on the resistance of this relationship based on a dynamic process able to include continuity and transitions in European history and, then, gradually, in the global dimension. Our main purpose is to specify the long and variable trend of the relationships between the two nations during six centuries, starting from the sixteenth - the very beginning of the Spanish hegemony in the Mediterranean area - and continuing until nowadays and present time’s challenges. The essay, finally, aims at answering, even in a partial and necessarily incomplete way, a key question: after a long (“eternal”?) history in common, can we find a shared identity between persistence and abrupt transitions?
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Deep mixing due to convective penetration during the red giant branch luminosity bump
Creators: name: Pratt, Jane
name: Baraffe, Isabelle
name: Dethero, Mary Geer
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar Hydrodynamics
Red Giant Branch Luminosity Bump
Convection
Convective Overshooting
Stellar Evolution

description: To interpret the wide variation in observed chemical abundances during the red giant phase of evolution, it is necessary to develop theoretical and computational modeling of convection under realistic stellar conditions. In this contribution we quantify mixing due to convective penetration in the deep stellar interior through global hydrodynamic simulations. We produce the evolutionary track of a 3 solar mass red giant using the 1D stellar evolution code MESA. We select models from this evolutionary track at different points in time, beginning at the first dredge-up and spanning the brief period of time of the red giant luminosity bump. The realistic stratification in density, temperature, and luminosity of these models is then used to produce global simulations of the stellar interior with the multi-dimensional, time implicit, fully compressible, hydrodynamic, implicit large eddy simulation code MUSIC. We compare the changing amount of mixing using a sophisticated enhanced diffusion model for convective penetration (Pratt et al 2017), targeted for one dimensional stellar evolution calculations.
description: {"references": ["Pratt, J., Baraffe, I., et. al. (2017). Extreme value statistics for two-dimensional convective penetration in a pre-main sequence star. Astronomy & Astrophysics, 604, A125.", "Pratt, J., Baraffe, I., et. al. (2020). Comparison of 2D and 3D compressible convection in a pre-main sequence star. Astronomy & Astrophysics, 638, A15."]}
Direct imaging and spectral characterisation of benchmark brown dwarfs
Creators: name: Rickman, Emily
Publisher: name: Zenodo
Year: 2021
Subjects: Brown dwarfs
Evolutionary models
Direct imaging
Spectral characterisation
Radial velocities

description: Evolutionary models of brown dwarfs are plagued by a lack of observational constraints. The complex molecular chemistry of their atmospheres leaves a relatively wide parameter space for models to span. Placing accurate mass and luminosity data to observationally populate the mass-luminosity relationship provides a major contribution to an understanding of brown dwarf evolutionary models. To date, individual dynamical masses are known for only a handful of brown dwarfs. Radial-velocity measurements provide only a lower limit on the measured masses due to the unknown orbital inclination. Therefore, directly imaging these candidates is needed to break that degeneracy and provide constraints on the dynamical mass of the companion, serving as a benchmark substellar object. I present a systematic approach to hunt for these benchmark objects using the radial-velocity CORALIE survey with over 20 years worth of data containing a volume-limited sample of 1647 low-mass main sequence stars within 50 parsecs. From this survey I have identified targets that I have directly imaged using VLT/SPHERE, which has led to the direct detection and spectral characterisation of several new benchmark brown dwarfs. This includes the coldest companion ever imaged to a main sequence star, and the first T/Y transition object with a measured dynamical mass. These objects are crucial in probing a parameter space in mass, separation, and age where the occurrence rate of these objects is not well understood, and where the mass-luminosity-age relation is unconstrained, providing important clues to the formation and evolution of these ultracool objects.
The trouble beyond $H_0$ and the new cosmic triangles
Creators: name: Bernal, José Luis
name: Verde, Licia
name: Jimenez, Raul
name: Kamionkowski, Marc
name: Valcin, David
name: Wandelt, Benjamin D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The distance ladder using supernovae yields higher values of the Hubble constant $H_0$ than those inferred from measurements of the cosmic microwave background (CMB) and galaxy surveys, a discrepancy that has come to be known as the `Hubble tension'. This has motivated the exploration of extensions to the standard cosmological model in which higher values of $H_0$ can be obtained from CMB measurements and galaxy surveys. The trouble, however, goes beyond $H_0$; such modifications affect other quantities, too. In particular, their effects on cosmic times are usually neglected. We explore here the implications that measurements of the age $t_{\rm U}$ of the Universe, such as a recent inference from the age of the oldest globular clusters, can have for potential solutions to the $H_0$ tension. The value of $H_0$ inferred from the CMB and galaxy surveys is related to the sound horizon at CMB decoupling (or at radiation drag), but it is also related to the matter density and to $t_{\rm U}$. Given this observation, we show how model-independent measurements may support or disfavor proposed new-physics solutions to the Hubble tension. Finally, we argue that cosmological measurements today provide constraints that, within a given cosmological model, represent an over-constrained system, offering a powerful diagnostic tool of consistency. We propose the use of ternary plots to simultaneously visualize independent constraints on key quantities related to $H_0$ like $t_{\rm U}$, the sound horizon at radiation drag, and the matter density parameter. We envision that this representation will help find a solution to the trouble of and beyond $H_0$.
description: 11 pages, 5 figures. Minimal changes, conclusions unchanged, matches the published version
Probing the slow neutron capture process in AGB stars using Barium star abundances
Creators: name: Cseh, Borbála
name: Világos, Blanka
name: Roriz, Michelle P.
name: Benjámin, Soós
name: D'Orazi, Valentina
name: Pereira, Claudio B.
name: Karakas, Amanda I.
name: Drake, Natalia A.
name: Junqueira, Selma
name: Sneden, Chris
name: Lugaro, Maria
Publisher: name: Zenodo
Year: 2021
Subjects: Post main sequence cool stars
AGB stars
s-process nuclepsynthesis

description: The Barium (Ba) star phenomenon is unmissable from the study and understanding of nucleosynthetic processes occuring in AGB stars. Ba stars belong to binary systems, where the former AGB polluted the companion, a less evolved star, which became enriched with material produced through the slow neuton capture process (s process). While the AGB has evolved to a white dwarf, the currently observed Ba star preserves the abundance pattern of the AGB, allowing us to test the imprints of the $s$ process. Comparing different AGB nucleosynthetic models and Ba star abundances, we are able to constrain the effect of the rotation velocity or the neutron source in the interior of the AGB star. The trend in the Ba star observations is predicted by non-rotating AGB models where 13C is the main neutron source. The results of the comparison of models with initial AGB masses from an independent source and the analysis of 28 Ba giant star abundances confirm that the polluting AGBs are of low mass.
Ab initio study of charge transport through single oxygen molecules in atomic aluminum contacts
Creators: name: Wohlthat, S.
name: Pauly, F.
name: Viljas, J. K.
name: Cuevas, J. C.
name: Schön, Gerd
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present ab initio calculations of transport properties of atomic-sized aluminum contacts in the presence of oxygen. The experimental situation is modeled by considering a single oxygen atom (O) or one of the molecules O2 and O3 bridging the gap between electrodes forming ideal, atomically sharp pyramids. The transport characteristics are computed for these geometries with increasing distances between the leads, simulating the opening of a break junction. To facilitate comparison with experiments further, the vibrational modes of the oxygen connected to the electrodes are studied. It is found that in the contact regime the change of transport properties due to the presence of oxygen is strong and should be detectable in experiments. All three types of oxygen exhibit a comparable behavior in their vibrational frequencies and conductances, which are well below the conductance of pure aluminum atomic contacts. The conductance decreases for an increasing number of oxygen atoms. In the tunneling regime the conductance decays exponentially with distance and the decay length depends on whether or not oxygen is present in the junction. This fact may provide a way to identify the presence of a gas molecule in metallic atomic contacts.
description: 8 pages, 9 figures; added appendix
Tra “complesso del tiranno” ed “ossessione della stabilità”: il disegno delle istituzioni democratiche dopo la caduta del fascismo e del franchismo
Creators: name: Lanza, Orazio
Publisher: name: Università degli Studi di Firenze
Year: 2015

description: Democracies are often the outcome of popular mobilizations, but,  almost always,  only a given group leads the process of democratization. In particular, the formal design of democratic institutions is, necessarily, the product of the political efforts of an élite, whose beliefs and preferences are particularly relevant. This essay aims to identify which legacies of the past have affected the institutional design of democratic regimes established in Italy and Spain after the fall of Fascism and Francoism. In particular it is highlighted the crucial role played by historical legacies, authoritarian legacies, historical memory and political learning. The differences in timing, mode of transition, in composition of the elite and some other factors affect the weight of the legacy of the past. The comparison between Italy and Spain provide a more useful information and explanation for the differences in institutional designs of two countries.
description: SocietàMutamentoPolitica, Vol 6, N° 11 (2015): Per comparare la crisi europea oggi: scenari  di mutamento sociale e politico in Italia e in Spagna
Παίζοντας με τα αγαπημένα μας παιχνίδια. Απόψεις παιδιών προσχολικής ηλικίας για τα παιχνίδια μαζικής κουλτούρας και αξιοποίηση τους στο πλαίσιο διδακτικής παρέμβασης
Creators: name: Λυμούση, Άννα Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Προσχολική εκπαίδευση
Παιχνίδι
Μαζική κουλτούρα
Preschool education
Play
Mass culture

description: Το παιχνίδι στο πλαίσιο της προσχολικής εκπαίδευσης και αγωγής αποτελεί αυτονόητη δραστηριότητα και καταλαμβάνει μεγάλο μέρος της ζωής του παιδιού. Στην εποχή που διανύουμε - όπως και σε κάθε εποχή- τα παιδιά υπό την επίδραση του κοινωνικο-οικονομικού περιβάλλοντος διαμορφώνουν τις προτιμήσεις και τα ενδιαφέροντά τους αναφορικά με τα παιχνίδια της επιλογής τους και τον τρόπο που παίζουν. Τα λεγόμενα παιχνίδια μαζικής κουλτούρας γίνονται ιδιαίτερα δημοφιλή αλλά και αμφιλεγόμενα ως προς την παιδαγωγική τους αξία. Συχνά πολλοί ενήλικες προσπαθούν να καθορίσουν µε τι παιχνίδια πρέπει να παίζει ένα παιδί, χωρίς να συνειδητοποιούν όμως, ότι περιορίζοντας τις δραστηριότητες παιχνιδιού, στερούν από το παιδί μοναδικές και ανεπανάληπτες ευκαιρίες ανακάλυψης και μάθησης. Με αφορμή το αυξανόμενο ενδιαφέρον των παιδιών για τα λεγόμενα παιχνίδια μαζικής κουλτούρας στη σύγχρονη εποχή αλλά και τις ανησυχίες εκπαιδευτικών και γονέων για αυτά υλοποιήσαμε έρευνα σε παιδιά προσχολικής ηλικίας, η οποία φιλοδοξεί να προσεγγίσει αυτό το είδος παιχνιδιού μέσα από τη ματιά των παιδιών.
description: Playing in pre-school education is a self-evident activity and occupies much of the child's life. Nowadays - as they do at any time – children under the influence of socio-economic conditions shape their preferences and interests for games and the way they want to play. So-called mass culture games become particularly popular and controversial in their pedagogical value. Often many adults try to determine what toys a child should play, but they do not realize that restricting play activities, they deprive the child of unique and unprecedented opportunities for discovery and learning (Avgitidou, 2001). Children's growing interest in so-called mass-culture games as well as the concerns of teachers and parents has as a result a survey of preschool children who aspire to approach this kind of play through the eyes of children.