cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Flare-Type IV Burst Event from Proxima Centauri and Implications for Space Weather
Creators: name: Zic, Andrew
name: Murphy, Tara
name: Lynch, Christene
name: Heald, George
name: Lenc, Emil
name: Kaplan, David L.
name: Cairns, Iver H.
name: Coward, David
name: Gendre, Bruce
name: Johnston, Helen
name: MacGregor, Meredith
name: Price, Danny C.
name: Wheatland, Michael S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Studies of solar radio bursts play an important role in understanding the dynamics and acceleration processes behind solar space weather events, and the influence of solar magnetic activity on solar system planets. Similar low-frequency bursts detected from active M-dwarfs are expected to probe their space weather environments and therefore the habitability of their planetary companions. Active M-dwarfs produce frequent, powerful flares which, along with radio emission, reveal conditions within their atmospheres. However, to date, only one candidate solar-like coherent radio burst has been identified from these stars, preventing robust observational constraints on their space weather environment. During simultaneous optical and radio monitoring of the nearby dM5.5e star Proxima Centauri, we detected a bright, long-duration optical flare, accompanied by a series of intense, coherent radio bursts. These detections include the first example of an interferometrically detected coherent stellar radio burst temporally coincident with a flare, strongly indicating a causal relationship between these transient events. The polarization and temporal structure of the trailing long-duration burst enable us to identify it as a type IV burst. This represents the most compelling detection of a solar-like radio burst from another star to date. Solar type IV bursts are strongly associated with space weather events such as coronal mass ejections and solar energetic particle events, suggesting that stellar type IV bursts may be used as a tracer of stellar coronal mass ejections. We discuss the implications of this event for the occurrence of coronal mass ejections from Proxima Cen and other active M-dwarfs.
description: 18 pages, 7 figures, 1 table. Published in the Astrophysical Journal
Σημασιολογική Αναπαράσταση των Δεδομένων του "Καλλικράτη" και η Δημοσιοποίηση τους στο Νέφος των Συνδεδεμένων Δεδομένων:
Creators: name: Ξανθοπούλου, Παρθένα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Συνδεδεμένα δεδομένα
Δήμος
Νέφος Συνδεδεμένων Δεδομένων
Linked Data
Municipality
LOD cloud

description: Σε μια προσπάθεια να γίνει ο Σημασιολογικός Ιστός πραγματικότητα στα ελληνικά δεδομένα, αυτή η εργασία έχει στόχο τον εμπλουτισμό του πρώτου ελληνικού νέφους με δεδομένα που αφορούν στους Δήμους του προγράμματος «Καλλικράτης». Πρόγραμμα «Καλλικράτης», ονομάζεται ο ελληνικός νόμος, με τον οποίο εφαρμόστηκε η διοικητική διαίρεση της Ελλάδας σε νέους Δήμους. Για να επιτευχθεί ο στόχος αυτός: 1) διερευνούμε τρόπους για να μετατραπούν τα δεδομένα από τις βάσεις δεδομένων σε δομημένη γνώση, 2) καταγράφονται για πρώτη φορά οι Καλλικρατικοί Δήμοι σε Συνδεδεμένα Δεδομένα, 3) δημιουργείται μια πρότυπη οντολογία των νέων Καλλικρατικών Δήμων, 4) διασυνδέεται το σύνολο δεδομένων των Καλλικρατικών Δήμων με άλλα σύνολα δεδομένων, που είναι αναρτημένα στο νέφος Συνδεδεμένων Δεδομένων.
description: In the process of realization of the Web of Data for Greek data, this thesis aims to enrich the first Greek LOD Cloud with data about the Municipalities of program Kalikratis. Program Kalikratis, is called the Greek law, which implements the administrative division of Greece into new Municipalities. To achieve this: 1) we explore ways to convert data from relational databases into structured knowledge, 2) Kalikratis Municipalities data are transformed and published as Linked Data, 3) a new Kalikratis Municipalities ontology is created, and 4) the Kalikratis Municipalities’ dataset is connected with other datasets, which are on LOD cloud.
Disentangling effective temperatures of individual eclipsing binary components by means of color-index constraining
Creators: name: Prsa, A.
name: Zwitter, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Eclipsing binary stars are gratifying objects because of their unique geometrical properties upon which all important physical parameters such as masses, radii, temperatures, luminosities and distance may be obtained in absolute scale. This poses strict demand on the model to be free of systematic effects that would influence the results later used for calibrations, catalogs and evolution theory. We present an objective scheme of obtaining individual temperatures of both binary system components by means of color-index constraining, with the only requirement that the observational data-set is acquired in a standard photometric system. We show that for a modest case of two similar main-sequence components the erroneous approach of assuming the temperature of the primary star from the color index yields temperatures which are systematically wrong by ~100K.
description: 6 pages, 3 figures, 1 table; to appear in proceedings of the Close Binaries in the 21st Century conference in Syros, Greece
Cascade or not cascade? Energy transfer and elastic effects in active nematics
Creators: name: Carenza, Livio Nicola
name: Biferale, Luca
name: Gonnella, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We numerically study the multi-scale properties of a 2d active gel to address the energy transfer mechanism. We find that activity is able to excite long-ranged distortions of the nematic pattern giving rise to spontaneous laminar flows and to a chaotic regime by further increasing the rate of active energy injection. By means of a scale-to-scale spectral analysis we find that the gel is basically driven by the local balancing between active injection and viscous dissipation, without any signal of non-linear hydrodynamical transfer and turbulent cascades. Furthermore, elasticity may qualitatively play an important role by transferring energy from small to larger scales through nemato-hydrodynamic interactions.
description: 7 pages, 5 figures
Understanding of ecologically valid binocular stimuli
Creators: name: Hunter, Dave
name: Hibbard, Paul
Publisher: name: F1000Research
Year: 2015

description: We used Independent Subspace Analysis on binocular photographic images in order to learn non-linear models of complex-cell neurons found in the V1 area of the visual cortex. We found complex-cell like models exhibited properties associated with ideal disparity detectors and there could be used to determine depth in a binocular scene in biologically plausible fashion.
Το Λεξικό ως διδακτικό βοήθημα: Η περίπτωση του Compact Εικονογραφημένου Λεξικού των εκδόσεων Καυκάς
Creators: name: Αντωνίου, Ουρανία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Λεξικογραφία
Νοητικό Λεξικό
Εικονογραφημένο Λεξικό
Lexicography
Mental Lexicon
Illustrated Lexicon

description: Σκοπός της παρούσας διπλωματικής ήταν να αξιοποιήσει το εν λόγω λεξικό από διδακτικής σκοπιάς και να κάνει προτάσεις βελτίωσής του. Αρχικά έγινε ιστορική αναδρομή στη λεξικολογία, τη λεξικολογραφία, τον τρόπο με τον οποίο κατασκευάζονται τα λεξικά και την τυπολογία των λεξικών. Έγινε αναφορά στον τρόπο με τον οποίο καταγράφονται οι λέξεις βάσει του νοητικού λεξικού, του εννοιολογικού συστήματος και της νοητικής χαρτογράφησης. Σημείο ενδιαφέροντος αποτέλεσε η παρουσία του λεξικού στην Ελληνική εκπαίδευση γενικά και στον τρόπο με τον οποίο η εικόνα συνεπικουρεί στη διδασκαλία. Εν συνεχεία παρατέθηκαν τα κριτήρια αξιολόγησης ενός λεξικού εν γένει και κατόπιν αξιολογήθηκε το συγκεκριμένο λεξικό.
description: The purpose of this thesis is to utilize said lexicon as a teaching aid and furthermore to propose some possible improvements. Initially there is a historical review on lexicology, lexicography, the methods of a lexicon’s construction and the dictionary typology. Reference was made to the way words are logged based on the mental lexicon, the notion system and the mental mind map. A point of interest constitutes the presence of the lexicon in the Greek Educational system and the way in which illustrations aid the learning process. Finally the evaluation criteria were cited and subsequently the evaluation of this specific lexicon was made.
The face N170 is mostly sensitive to pixels in the contralateral eye area
Creators: name: Rousselet, Guillaume
name: Gilman, Hannah
name: Ince, Robin
name: Schyns, Philippe
Publisher: name: F1000Research
Year: 2015

description: Recently, we quantified the coding function of the N170 single-trial variability in possibly the simplest socially relevant task: face detection (Rousselet et al. 2014). On each experimental trial, observers saw face and noise pictures sparsely sampled with Gaussian apertures (“bubbles”; Gosselin & Schyns 2001). Using reverse correlation and mutual information, we found that the presence of pixels around the eye contralateral to the recording electrode modulated single-trial ERPs at lateral-occipital electrodes, and most strongly the N170. Here, in three control experiments, each involving 6 subjects, we show that this result holds for faces of different sizes, faces expressing different facial expressions of emotions, and after contrast normalisation. However, the absolute N170 contralateral eye sensitivity differed across face sizes, and was delayed and strongly reduced by contrast reversal. Because contrast reversal preserves local edges, and eye saliency, but affects the distribution of contrasts across the face, the lower brain sensitivity to eye pixels in that condition suggests that it reflects some form of feature processing in a face context, possibly tuned to a particular face size. We conclude that the N170 reflects predominantly, in a face detection task, the encoding of a single feature: the contralateral eye.
A deep Chandra look at the low L_B elliptical NGC821: X-ray binaries, a galactic wind and emission at the nucleus
Creators: name: Pellegrini, S.
name: Baldi, A.
name: Kim, D. W.
name: Fabbiano, G.
name: Soria, R.
name: Siemiginowska, A.
name: Elvis, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The relatively nearby (distance=24.1 Mpc) elliptical galaxy NGC821, hosting a central massive black hole but inactive at all wavelengths, was observed with Chandra for a total exposure of 230 ksec, to search for nuclear emission and gas available for accretion. Within its optical image, 41 sources were detected, with spectral properties typical of low mass X-ray binaries (LMXBs). The fractions of LMXBs in the field and in globular clusters were determined, together with their X-ray luminosity function (XLF) down to L(0.3-8 keV)=2\times 10^{37} erg/s. At the galactic center a source of L(0.3-8 keV)=6\times 10^{38} erg/s was detected for the first time, slightly extended. Its spectral shape is quite hard (Γ=1.49^{+0.14}_{-0.13}), without intrinsic absorption. It is surrounded by three sources with spectral shape typical of LMXBs and luminosities on the brightest end of the XLF. One is consistent with being pointlike; the others could be the superposition of few point sources and/or truly diffuse emission, with one resembling a jet-like feature. Diffuse emission was detected out to R\sim 30'', and comes mostly from unresolved LMXBs, with a minor contribution from other types of stellar sources. Different lines of investigation consistently provide no evidence for hot gas. Hydrodynamical simulations show that stellar mass losses are driven out of NGC821 in a wind sustained by type Ia supernovae, but also hot accreting gas within a very small inner region. A companion paper presents further observational results from $Spitzer$ and the VLA, and possible accretion modalities for this central massive black hole.
description: 49 pages, 13 color figures; in press on ApJ. Substantial additions to the study of the X-ray binaries population
Progressively removing high spatial frequencies: the impact on performance when searching for cancer in chest x-rays
Creators: name: Donovan, Tim
name: Walker, Peter
name: Litchfield, Damien
Publisher: name: F1000Research
Year: 2015

description: Optimal imaging quality has to be described with reference to the performance of imaging tasks by human observers when deciding on the efficacy of an imaging system. This study is designed to determine how far images can be blurred by removing high frequency information before diagnostic performance is affected. A test bank was created using wavelet packet transform to progressively remove high spatial frequency information from chest radiographs with and without lung nodules. Observers with no experience of interpreting chest x-rays, and those with nearly three years’ experience as diagnostic radiography students were tested. Performance was measured using receiver operating characteristic analysis (ROC) and response time.

Performance was maintained for the radiography students for all but the most blurred image. Observers with no experience of medical images could not do the task.
These findings are relevant for those circumstances where undersampled data could be used or images need to be viewed on mobile devices, and indicate that for those with some expertise with specific types of images diagnostic performance may not be affected.
Changing the climate of the University classroom: perspectives from faculty using feminist scholarship
Creators: name: Cole, Holly A.
Publisher: name: University of British Columbia
Year: 2009

description: The university campus has dramatically changed with the increased enrolment and visibility of women. Women now clearly represent the majority of postsecondary full and part-time enrolments. The current challenge to the traditions of higher education involves ensuring that the values and perspectives of women are fully represented in the academy. One of those areas requiring attention is the curriculum. A plethora of feminist perspectives capture and express the experiences of women and provide an understanding of their diverse social and political realities. This thesis examined how feminist scholarship has added a critical and constructive voice to existing curricula and the development of new knowledge. Using semi-structured interviews, ten women university faculty were interviewed about their experiences of building a gender inclusive curriculum using feminist scholarship. Women spoke about the tension between feminism and academia and the conflicts they experienced both as women and feminist faculty. For the feminist faculty, working outside masculinist norms had both personal and professional costs and benefits. This study confirmed current research that maintains women have not yet been accepted as agents of knowledge and authority in their fields. This thesis found that feminist scholarship still resides, for the most part, in the margins of the disciplines. The curriculum revealed itself as a restricted model of discourse, its design and creation influenced by the personal and subjective emotions and intellect of its owner, whether that person was a feminist or a conservatist. This research concluded that curriculum is socially constructed, implying that curriculum is related to gender, and when partnered with feminism, it is closely tied to the politics of inclusion.
Thermostatistical analysis for short-range interaction Potentials
Creators: name: Neves, M. J.
name: Abreu, Everton M. C.
name: de Oliveira, Jorge B.
name: Gonçalves, Marcelo Kesseles
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we study the thermodynamics of short-range central potentials, namely, the Lee-Wick potential, and the Plasma potential. In the first part of the paper we obtain the numerical solution for the orbits equation for these potentials. Posteriorly, we introduce the thermodynamics through the microcanonical and canonical ensembles formalism defined on the phase space of the system. We calculate the density of states associated with the Lee-Wick and the Plasma potentials. From density of states, we obtain the thermodynamical physical quantities like entropy and temperature as functions of the energy. We also use the Boltzmann-Gibbs formalism to obtain the partition functions, the mean energy and the thermal capacity for these short-range potentials.
description: 25 pages, 14 figures
Το εργατικό δίκαιο στο «απόσπασμα». Η «περιπέτεια» ενός θεσμού-Διαιτησία
Creators: name: Παπασταμούλη, Βασιλική Λεωνίδα
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εργατικό
Διαιτησία
Μνημόνια
Labor
Arbitration
Memoranda

description: Σκοπός της διατριβής ήταν η μελέτη του θεσμού της διαιτησίας και ειδικότερα των αλλαγών που επήλθαν στο σύστημα της διαιτησίας με τις διατάξεις των Mνημονίων Ι και ΙΙ. Αναλύσαμε την έννοια της συλλογικής αυτονομίας , τη νομική της φύση , την κατοχύρωση της στο εγχώριο , το ευρωπαϊκό και το διεθνές δίκαιο αλλά και τα όρια της. Στη συνέχεια οριοθετήσαμε την έννοια των συλλογικών διαφορών και τη διάκρισή τους από άλλες συναφείς έννοιες. Ακόμη αναφερθήκαμε αναλυτικά στην έννοια και τις μορφές διαιτησίας , τη διαδικασία που όριζε το προϊσχύσαν δίκαιο και τα χαρακτηριστικά της διαιτητικής απόφασης. Ασχοληθήκαμε επιπλέον με τις τροποποιήσεις που επέφεραν τα Mνημόνια Ι και ΙΙ κυρίως στο αντικείμενο , τη διαδικασία της διαιτησίας και τη λειτουργία του Οργανισμού Μεσολάβησης και Διαιτησίας (Ο.ΜΕ.Δ) και τη συμβατότητα των μεταρρυθμίσεων με το Σύνταγμα και τις ισχύουσες Διεθνείς Συμβάσεις Εργασίας (ΔΣΕ).
description: Τhe aim of the present thesis was the study of the institution of arbitration and in particular changes made to the system of arbitration with the provisions of Memoranda I and II. We analyzed the concept of collective autonomy, the legal status, its consolidation in the domestic, European and International law and its limits. Then we defined the concept of collective disputes and distinguished them from other related concepts. We also analysed the concept and forms of arbitration, the procedure laid down by the pre-existing law and the features of the arbitration award. We furthermore dealt with modifications been made by Memoranda I and II, notably in the object, the arbitration procedure and the operation of the Organisation for Mediation and Arbitration (O.ME.D) and the compatibility of the modifications to the Constitution and the existing International Labour Organisation (ILO) Conventions.
Taller Análisis Bibliométricos contexto Ciencia Abierta: "Una mirada a las diversas perspectivas del ecosistema de producción, difusión y evaluación de la investigación académica"
Creators: name: Cortés-Villegas, Rodrigo
Publisher: name: Zenodo
Year: 2024
Subjects: Ciencia Abierta
Métricas de evaluación
Publicación científica

description: En el ámbito de la Ciencia Abierta y los diversos canales de comunicación y divulgación científica o académica, resulta imprescindible la aplicación de Métodos sistemáticos para estudiar o desarrollar soluciones en un ámbito del conocimiento. Es en este contexto, que la Ciencia Abierta se orienta a hacer ciencia tradicional con más transparencia, por ejemplo, al compartir abiertamente código, publicaciones y los datos. Muchos investigadores ya lo hacen, pero no lo llaman así (Foster, 2018).

En lo que se refiere a la evaluación de la producción científica a nivel internacional, gran parte de la edición de revistas científicas y académicas, obedecen a un modelo comercial el que desarrolla los indicadores de evaluación (Guédon, 2011). Estos últimos años, a nivel internacional, a partir de las críticas a los sistemas tradicionales de evaluación, se observa una tendencia a la revisión de los procesos de evaluación y sus indicadores, y al seguimiento de las recomendaciones de las principales declaraciones de la comunidad científica y académica en relación con los procesos de evaluación. Comprender las diversas perspectivas del ecosistema de producción, difusión y evaluación de la actividad científica y la investigación académica, resulta un deber primario de todos quiénes intervienen en el modelo de comunicación cientifica y la consideran un bien público, este trabajo nos invita conocer las tendencias y nuevas directrices en el ámbito de la evaluación de la actividad en investigación académica.
Phonon softening and "forbidden" mode observed by Raman scattering in Na0.5CoO2
Creators: name: Zhang, Q. M.
name: an, M.
name: Yuan, S. K.
name: Wu, Y.
name: Wu, D.
name: Luo, J. L.
name: Wang, N. L.
name: Bao, W.
name: Wang, Y. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Polarized Raman scattering measurements have been performed on Na0.5CoO2 single crystal from 8 to 305 K. Both the A1g and E1g phonon modes show a softening below Tc1 ~ 83 K. Additionally, the A1g phonon mode, which is forbidden in the scattering geometry of cross polarization for the triangular CoO2 layers, appears below Tc1. In contrast, the metal-insulator transition at Tc2 ~ 46 K has only secondary effect on the Raman spectra. The phonon softening and the ``forbidden'' Raman intensity follow closely magnetic order parameter and the gap function at the Fermi surface, indicating that the distortion of CoO6 octahedra at Tc1, instead of the Na ordering at ~350 K, is the relevant structural component of the 83 K phase transition.
description: 5 pages, 4 figures
title: μ → e conversion in nuclei: EFT description, charge densities, and pseudo-scalar decays
Creators: name: Noël, Frederic
Publisher: name: Universität Bern
Year: 2024
Subjects: subject: 530 Physics

description: The description of LFV μ → e conversion in nuclei proves challenging due to
the various energy scales involved, ranging from the BSM scale via chiral scales
down all the way to nuclear and bound-state physics scales. Nevertheless, this
is a pressing matter in light of the upcoming experiments Mu2e and COMET,
which will improve the experimental limits by four orders of magnitude. This can
be done in a model-independent way using an effective field theory framework in
terms of effective BSM operators, which however crucially depends on hadronic
and nuclear matrix elements. In this work, we present the comprehensive EFT
formalism we developed, which describes bound-state physics and nuclear responses
at the same time, and discuss the related hadronic and nuclear uncertainties. In
particular, the uncertainties inherent in these non-perturbative inputs limit the discriminating power among different BSM scenarios that can be achieved. In order to quantify the associated uncertainties, we revisit nuclear charge densities and propagate uncertainties from elastic electron scattering experiments. These charge densities, parameterized in terms of Fourier-Bessel series, are crucial ingredients, in combination with EFT and nuclear-structure techniques, for the evaluation of general μ → e conversion rates with quantified uncertainties. Using this framework, we could also transfer the very strong experimental limits for μ → e conversion onto LFV decays of light pseudo-scalars, resulting in indirect limits surpassing the direct experimental ones by several orders of magnitude.
Το Περιβολάκι της επαρχίας Λαγκαδά. Ιστορία-εκπαίδευση-παραδόσεις:
Creators: name: Χατζίκος, Γεώργιος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Περιβολάκι
Ηθη και έθιμα
Σύνθεση πληθυσμού
Perivolaki
Morals and customs
Composition of the population

description: Η εργασία αυτή εξετάζει το Περιβολάκι ένα χωριό της επαρχίας Λαγκαδά. Γίνεται εκτενής αναφορά στην ιστορία του χωριού μέσα στο χρόνο. Είναι χωριό με μεγάλη ιστορία που ξεκινάει από την Νεολιθική εποχή. Άλλαξε τέσσερις ονομασίες μέχρι να καταλήξει στη σημερινή. Επίσης αναφέρεται στη σύνθεση του πληθυσμού. Αποτελείται από ανθρώπους που ήρθαν και κατοίκησαν από την Ανατολική Ρωμυλία, Ανατολική Θράκη, από κατοίκους από τα γύρω χωριά και τους γηγενείς. Η εργασία αναφέρεται ακόμη στην εκκλησία του χωριού, τη Μητρόπολη Λαγκαδά, στο σχολείο και την ιστορία του, όπως και στους συλλόγους του χωριού. Τέλος γίνεται εκτενής αναφορά στα ήθη και έθιμα του χωριού, στις γιορτές και τα πανηγύρια όπως επίσης και στη λαϊκή ιατρική.
description: This thesis deals with Perivolaki, a village in the province of Laggadas. It ‘s an extensive report on the history of the village throughout the time, starting from the Neolithic Age. The village has changed four names until today. Moreover, it refers to the composition of the population, which is mostly made up of people who came from Eastern Romulus, in people who came from Eastern Thrace and people from the nearby villages and its native inhabitants. Furthermore, it refers to the church of the village, the metropolis of Laggadas, to the school and its history, and its associations, as well. In the end, it considers at length the morals and customs of the village, its celebrations and festivals and its alternative medicine, as well.
Spin Angular Momentum Imparted by Gravitational Waves
Creators: name: Sharif, M
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Following the demonstration that gravitational waves impart linear momentum, it is argued that if they are polarized they should impart angular momentum to appropriately placed 'test rods' in their path. A general formula for this angular momentum is obtained and used to provide expressions for the angular momentum imparted by plane and cylindrical gravitational waves.
description: 5 pages
Η συμβολή του αγροτικού τουρισμού στην τοπική ανάπτυξη: η περίπτωση του Νεστορίου Καστορίας
Creators: name: Λιάμη, Ζωή Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αγροτικός τουρισμός
Τοπική Ανάπτυξη
Αντιλήψεις
Rural tourism
Local development
Perceptions

description: Ο αγροτικός τουρισμός αποτελεί ένα από τα βασικά εργαλεία και πολιτικές με τα οποία η ύπαιθρος μπορεί να αναγεννηθεί και να αναπτυχθεί περιορίζοντας τις αρνητικές συνέπειες στο περιβάλλον. Λειτουργεί ως μία προσπάθεια αναδιάρθρωσης των αγροτικών περιοχών, προωθώντας την πολυτομειακή ανάπτυξη και ανταγωνιστικότητα της τοπικής οικονομίας. H έρευνα που πραγματοποιήθηκε στο πλαίσιο της διατριβής αφορούσε στις αντιλήψεις και προσδοκίες των μόνιμων κατοίκων μιας αγροτικής περιοχής (Νεστόριο της Καστοριάς). Η ανάλυση των δεδομένων έδειξε ότι με την ανάπτυξη του αγροτικού τουρισμού βελτιώνεται η καθημερινή ζωή των κατοίκων της περιοχής, δημιουργούνται νέες θέσεις εργασίας σε τοπικό επίπεδο. Τέλος, η περιοχή μπορεί να στηρίξει την ανάπτυξη αγροτικού τουρισμού δυναμικά παρόλο που οι κάτοικοι της περιοχής δεν έχουν ενιαίες αντιλήψεις ως προς τις επιδράσεις της ανάπτυξης του αγροτικού τουρισμού στην τοπική ανάπτυξη.
description: Rural tourism is one of the basic tools and policies with which the countryside can be regenerated and developed minimizing the negative effects to the environment. Functions as an effort to restructure the rural areas, promoting multisector development and competitiveness of the local economy. The survey that conducted as part of this study concerned the perceptions and expectations of the residents of a rural area (Nestorio of Kastoria). Data analysis showed that the development of rural tourism improves the daily lives of the residents in local level new jobs are created. Finally, the area can support the development of rural tourism dynamically although the residents do not share common perceptions about the effects of the growth of rural tourism in local development.
A new class of quantum bound states: diprotons in extreme magnetic fields
Creators: name: Allor, Danielle
name: Bedaque, Paulo
name: Cohen, Thomas D.
name: Sebens, Charles T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This paper considers the possibility that two charged particles with an attractive short-ranged potential between them which is not strong enough to form bound states in free space, may bind in uniform magnetic fields. It is shown that in the formal limit where Coulomb repulsion is negligible (q -> 0 and B_0 -> \infty with q B_0 fixed where q is the charge and B_0 the field strength) there always exists a bound state for a system of two identical charged particles in a constant magnetic field, provided that there is a short-range uniformly attractive potential between them. Moreover, it is shown that in this limit {\it any} potential with an attractive s-wave scattering length will posses bound states provided that the range of the potential is much smaller than the characteristic magnetic length, r_0 = (\frac{q B_0}{4})^{-1/2}. For this case, the binding is computed numerically. We estimate the size of the magnetic field needed to approximately reach a regime where the formal limit considered becomes a good approximation to the dynamics. These numerical estimates indicate that two protons in an extremely strong magnetic field such as might be found in a magnetar will bind to form a diproton.
Time-Variable Radio Recombination Line Emission in W49A
Creators: name: De Pree, C. G.
name: Wilner, D. J.
name: Kristensen, L. E.
name: Galván-Madrid, R.
name: Goss, W. M.
name: Klessen, R. S.
name: Mac Low, M. -M.
name: Peters, T.
name: Robinson, A.
name: Sloman, S.
name: Rao, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new Jansky Very Large Array (VLA) images of the central region of the W49A star-forming region at 3.6~cm and at 7~mm at resolutions of 0\farcs15 (1650 au) and 0\farcs04 (440 au), respectively. The 3.6~cm data reveal new morphological detail in the ultracompact \ion{H}{2} region population, as well as several previously unknown and unresolved sources. In particular, source A shows elongated, edge-brightened, bipolar lobes, indicative of a collimated outflow, and source E is resolved into three spherical components. We also present VLA observations of radio recombination lines at 3.6~cm and 7~mm, and IRAM Northern Extended Millimeter Array (NOEMA) observations at 1.2~mm. Three of the smallest ultracompact \ion{H}{2} regions (sources A, B2 and G2) all show broad kinematic linewidths, with $Δ$V$_{FWHM}\gtrsim$40~km~s$^{-1}$. A multi-line analysis indicates that broad linewidths remain after correcting for pressure broadening effects, suggesting the presence of supersonic flows. Substantial changes in linewidth over the 21 year time baseline at both 3.6 cm and 7 mm are found for source G2. At 3.6 cm, the linewidth of G2 changed from 31.7$\pm$1.8 km s$^{-1}$ to 55.6$\pm$2.7 km s$^{-1}$, an increase of $+$23.9$\pm$3.4 km s$^{-1}$. The G2 source was previously reported to have shown a 3.6~cm continuum flux density decrease of 40\% between 1994 and 2015. This source sits near the center of a very young bipolar outflow whose variability may have produced these changes.
description: 18 pages, 7 figures, Accepted for publication in The Astronomical Journal
Scalar-tensor mixing from icosahedral inflation
Creators: name: Nicolis, Alberto
name: Sun, Guanhao
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the mixed scalar-tensor two-point function in icosahedral inflation. Within the regime of validity of the effective field theory, this has to be perturbatively small; in particular, much smaller than the scalar spectrum. However, it can be much bigger that the tensor spectrum itself. We discuss observational implications for the CMB temperature-polarization spectrum.
Relaxation dark energy in non-critical string cosmologies and astrophysical data
Creators: name: Mavromatos, Nikolaos E.
name: Mitsou, Vasiliki A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this talk we review briefly the basic features of non-critical (dissipative) String Cosmologies, and we confront some of these models with supernova data. We pay particular attention to the off-shell and dilaton contributions to the dynamical evolution equations of the non-critical string Universe, as well as the Boltzmann equation for species abundances. The latter could have important consequences for the modification of astrophysical constraints on physically appealing particle physics models, such as supersymmetry. The data fits show that non-critical string cosmologies may be viable alternatives to LambdaCDM model.
description: 12 pages, LaTeX uses special macro, 2 EPS figures incorporated, Invited talk (N.E.M.) at IDM 2006: 6th International Workshop On The Identification Of Dark Matter, 11-16 September 2006, Island of Rhodes, Greece
Super-Hawking Radiation
Creators: name: Ferreira, Ricardo Z.
name: Heissenberg, Carlo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss modifications to the Hawking spectrum that arise when the asymptotic states are supertranslated or superrotated. For supertranslations we find nontrivial off-diagonal phases in the two-point correlator although the emission spectrum is eventually left unchanged, as previously pointed out in the literature. In contrast, superrotations give rise to modifications which manifest themselves in the emission spectrum and depend nontrivially on the associated conformal factor at future null infinity. We study Lorentz boosts and a class of superrotations whose conformal factors do not depend on the azimuthal angle on the celestial sphere and whose singularities at the north and south poles have been associated to the presence of a cosmic string. In spite of such singularities, superrotations still lead to finite spectral emission rates of particles and energy which display a distinctive power-law behavior at high frequencies for each angular momentum state. The integrated particle emission rate and emitted power, on the contrary, while finite for boosts, do exhibit ultraviolet divergences for superrotations, between logarithmic and quadratic. Such divergences can be ascribed to modes with support along the cosmic string. In the logarithimic case, corresponding to a superrotation which covers the sphere twice, the total power emitted still presents the Stefan-Boltzmann form but with an effective area which diverges logarithmically in the ultraviolet.
description: 46 pages, 5 figures
Early childhood education and care for Indigenous children and their families from colonised nations
Creators: name: Grace, Rebekah
name: Skerrett, Mary
name: Ritchie, Jenny
name: Greenwood, Margo
name: Trudgett, Michelle
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2024
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education
classificationCode: 44
subject: Human society

description: No description supplied
Be star discs: powered by a non-zero central torque
Creators: name: Nixon, Chris
name: Pringle, Jim
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Be stars are rapidly rotating B stars with Balmer emission lines that indicate the presence of a Keplerian, rotationally supported, circumstellar gas disc. Current disc models, referred to as "decretion discs", make use of the zero torque inner boundary condition typically applied to accretion discs, with the 'decretion' modelled by adding mass to the disc at a radius of about two per cent larger than the inner disc boundary. We point out that, in this model, the rates at which mass and energy need to be added to the disc are implausibly large. What is required is that the disc has not only a source of mass but also a continuing source of angular momentum. We argue that the disc evolution may be more physically modelled by application of the non-zero torque inner boundary condition of Nixon & Pringle (2020), which determines the torque applied at the boundary as a fraction of the advected angular momentum flux there and approaches the accretion and decretion disc cases in the appropriate limits. We provide supporting arguments for the suggestion that the origin of the disc material is small-scale magnetic flaring events on the stellar surface, which, when combined with rapid rotation, can provide sufficient mass to form, and sufficient angular momentum to maintain, a Keplerian Be star disc. We discuss the origin of such small-scale magnetic fields in radiative stars with differential rotation. We conclude that small-scale magnetic fields on the stellar surface, may be able to provide the necessary mass flux and the necessary time-dependent torque on the disc inner regions to drive the observed disc evolution.
description: 6 pages, no figures, accepted for publication in The Astrophysical Journal Letters
An instructional model for educational technology within applied health sciences
Creators: name: Rodenburg, Dirk
Publisher: name: University of British Columbia
Year: 2009

description: This thesis will outline a model for instruction for educational technology within applied health sciences that explicitly targets the conceptual development of the student. The model is based on a first principle integration of instructional theory, instructional design, clinical/medical reasoning, and user modeling. Utilizing a patient management problem format, the model relies on three fundamental tasks carried out by the end-user: key feature selection, analogous model selection, and the choice of a clinical management strategy. It is suggested that these tasks foster deep and integrated thinking on the part of the end-user as a consequence of the necessity to articulate and compare conceptual frameworks. The model outlines a process in which content and clinical context can be "coded" and weighted to allow for some limited inferencing by the presenting system against several predefined conceptual models. The inferencing is based on a simple Baysean formula in which a look-up table of probabilities assigned to each element of each node of the clinical management problem is used to calculate the probability of a conceptual model being carried by the end-user. The inferencing and content structure is specifically designed to provide strong instructional and metacognitive support to the end-user within the targeted domain. The model proposes an extensive feedback cycle in which the end-user is given the option of reviewing each stage in the decision making process, and comparing it to the "ideal" representations of an expert. No formal evaluation of the efficacy of the proposed model is offered.
References on Economic History as a Field of Research and Study
Creators: name: Edwards, Everett E.
name: Edwards, Everett E.
Publisher: name: Unknown
Year: 1936
Subjects: Teaching/Communication/Extension/Profession

description: Excerpt from the Preface: The close nexus between agricultural and economic history results inevitably in the examination of the latter as a field of research and study when the methods and materials for the former are under consideration. It is believed, therefore, that this bibliography will be of service to economic historians and even to economists and historians generally as well as to those who are primarily interested in agricultural history.
Vancouver Community College ABE student profile and use of support services
Creators: name: Nobel, Elizabeth Violet
Publisher: name: University of British Columbia
Year: 2009

description: The study described in the following pages was conducted in the summer of 19 9 3 at the King Edward Campus, (KEC) of Vancouver Community College. The subjects of the study were students attending classes at the Provincial Level of the Adult Basic Education (ABE) program at the college. The primary purpose of the study was to determine the characteristics of the students as compared with the literature, and to discover whether students used the support services designed to assist them. A student survey was developed and administered to students by instructors during class time. The sample was selected by targeting all Provincial Level classes in session at the time the survey was conducted, and thirty questionnaires were given to instructors in the self-paced program to be handed out to students when they were scheduled to come in. The information from the questionnaires was then entered into the computer and a statistical analysis was done. When the results of the study were compared with the information gathered from the literature review, it was learned that at KEC, the Provincial Level ABE student is more traditional than nontraditional, that is, the students were younger than anticipated, and the number of female students was only 3.8% higher than the ABE STUDENT PROFILE AND USE OF SUPPORT SERVICES III number of male students. It was also learned that the majority of the students had already completed secondary school before coming to study at KEC, but were stil l taking grade twelve level courses in order to have the prerequisite knowledge to enter the programs of their choice at Vancouver Community College or other institutions. Although students used the support services available to them, there were some differences in how the high proportion of second language speakers used them. However counselling, in particular, although used somewhat differently by second language speakers, was used by students at the Provincial Level for advising before registration, rather than for personal counselling or career planning. As colleges plan for the future, it has become even more important to obtain student feedback regarding services designed to assist them. The development of a student profile enables administrators and practitioners alike to gain insight into their student population and what the students perceive to be their needs. It is hoped that this study will be the first of many which will help to identify the needs and gaps in ABE programs and the services that are provided to support the students.
LHC and ILC probes of hidden-sector gauge bosons
Creators: name: Kumar, Jason
name: Wells, James D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Intersecting D-brane theories motivate the existence of exotic U(1) gauge bosons that only interact with the Standard Model through kinetic mixing with hypercharge. We analyze an effective field theory description of this effect and describe the implications of these exotic gauge bosons on precision electroweak, LHC and ILC observables.
description: 6 pages, 4 figures, RevTex, PRD, v3: expanded discussions, refs
Relative Asymptotic of Multiple Orthogonal Polynomials for Nikishin Systems
Creators: name: García, Abey López
name: Lagomasino, Guillermo López
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 42C05, 41A20 (Primary), 30E10 (Secondary)

description: We prove relative asymptotic for the ratio of two sequences of multiple orthogonal polynomials with respect to Nikishin system of measures. The first Nikishin system ${\mathcal{N}}(σ_1,...,σ_m)$ is such that for each $k$, $σ_k$ has constant sign on its compact support $\supp {σ_k} \subset \mathbb{R}$ consisting of an interval $\widetildeΔ_k$, on which $|σ_k^{\prime}| > 0$ almost everywhere, and a discrete set without accumulation points in $\mathbb{R} \setminus \widetildeΔ_k$. If ${Co}(\supp {σ_k}) = Δ_k$ denotes the smallest interval containing $\supp {σ_k}$, we assume that $Δ_k \cap Δ_{k+1} = \emptyset$, $k=1,...,m-1$. The second Nikishin system ${\mathcal{N}}(r_1σ_1,...,r_mσ_m)$ is a perturbation of the first by means of rational functions $r_k$, $k=1,...,m,$ whose zeros and poles lie in $\mathbb{C} \setminus \cup_{k=1}^m Δ_k$.
description: 30 pages
Pair Drizzle around Sub-Eddington Supermassive Black Holes
Creators: name: Wong, George N.
name: Ryan, Benjamin R.
name: Gammie, Charles F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Electron-positron pair creation near sub-Eddington accretion rate black holes is believed to be dominated by the Breit-Wheeler process (photon-photon collisions). The interacting high energy photons are produced when unscreened electric fields accelerate leptons either in coherent, macroscopic gaps or in incoherent structures embedded in the turbulent plasma flow. The latter type of acceleration results in a drizzle of pair production sourced by photons from the background radiation field whose energies are near the pair-production threshold. In this work, we use radiation GRMHD simulations to extend an earlier study of pair drizzle by Moscibrodzka et al. We focus on low-magnetization (SANE) accretion onto supermassive Kerr black holes and consider radiation due to synchrotron, bremsstrahlung, and Compton upscattering processes. We confirm that pair drizzle in M87 is sufficient to keep the magnetospheric charge density orders of magnitude above the Goldreich-Julian density. We also find that pair production peaks along the jet-disk boundary.
description: 14 pages, 8 figures, accepted for publication in ApJ
Appendix to: NICER and Swift/XRT monitoring of the 2023 outburst of Swift J1727.7–1613
Creators: name: Stiele, Holger
name: Kong, Albert
Publisher: name: Astronomy and Astrophysics
Year: 2024
Subjects: X-ray astrophysics
X-ray binaries
stellar-mass black hole
accretion physics
quasi-periodic oscillations
Lense-Thirring precession

description: Tables providing parameters of the fundamental QPO and its harmonic for the (snapshots of the) NICER observations studied in our paper on the 2023 outburst of Swift J1727.7–1613 (Stiele & Kong, A&A, 2024).  

This X-ray transient was first detected on 24 August 2023 by Swift/BAT and INTEGRAL. We investigated data from the Neutron star Interior Composition Explorer (NICER) and the Neil Gehrels Swift Observatory taken between August and October 2023.In the paper we present diagnostic diagrams and investigated the evolution of quasi-periodic oscillations (QPOs) and the evolution of the spectral parameters.The overall evolution of Swift J1727.7–1613 is consistent with a low-mass black hole X-ray binary transiting from the low-hard state through the intermediate states into the high-soft state. Based on the Lense-Thirring precession interpretation of type-C QPOs we obtained outer radii for the hot inner flow and found that the overall evolution of these radii agrees well with the evolution of the inner disc radii obtained from fits to the energy spectra. This result holds on all times scales tested in this study and supports the Lense-Thirring precession interpretation of type-C QPOs.
Η Αρχαία Ελληνική μουσική και η σχέση της με την Βυζαντινή μουσική:
Creators: name: Ζήδρος, Ανέστης Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: βυζαντινή
μουσική
Αρχαία
Byzantine
music
Ancient

description: Η Αρχαία Ελληνική μουσική είναι πολύ σημαντικό κομμάτι της ιστορίας μας. Ήταν η μουσική των προγόνων μας και απετέλεσε την βάση πάνω στην οποία στηρίχθηκε η βυζαντινή μουσική, η μουσική που χρησιμοποιεί για τις ανάγκες της η ορθόδοξη εκκλησία.. Μπορεί να υπάρχουν κάποιες διαφοροποιήσεις όμως η σχέση μεταξύ των 2 μουσικών, της αρχαίας ελληνικής και της βυζαντινής μουσικής, είναι πολύ στενή.
description: The Ancient Greek music is a very important piece of our history. It was the music of our antecedents and the base for the Byzantine music, the music which is being used from the Orthodox Church. It might be some differences but the relation between the Ancient Greek music and the Byzantine music, is very closed.