cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Time evolution of gaps in stellar streams in axisymmetric Stäckel potentials
Creators: name: Koppelman, Helmer H.
name: Helmi, Amina
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: When a subhalo interacts with a cold stellar stream it perturbs its otherwise nearly smooth distribution of stars, and this leads to the creation of a gap. The properties of such gaps depend on the parameters of the interaction. Their characterisation could thus lead to the determination of the mass spectrum of the perturbers and possibly reveal the existence of dark subhalos orbiting the Milky Way. Our goal is to construct a fully analytical model of the formation and evolution of gaps embedded in streams orbiting in a realistic Milky Way potential. To this end, we extend the model of Helmi & Koppelman (2016) for spherical potentials, and predict the properties of gaps in streams evolving in axisymmetric Stäckel potentials. We make use of action-angles and their simple behaviour to calculate the divergence of initially nearby orbits slightly perturbed by the interaction with a subhalo. Our model, corroborated by N-body experiments, predicts that the size of a gap grows linearly with time. We obtain analytical expressions for the dependencies of the growth rate on the orbit of the stream, the properties of the subhalo (mass, scale-radius), and the geometry of the encounter (relative velocity, impact parameter). We find that the density at the centre of the gap decreases with time as a power-law in the same way as the density of a stream. This results in the density-contrast between a pristine and a perturbed stream on the same orbit asymptotically reaching a constant value dependent only on the encounter parameters. We find that at a fixed age, smallish gaps are sensitive mostly to the mass of the subhalo, while gaps formed by subhalo flybys with a low relative velocity, or when the stream and subhalo move parallel, are degenerate to the encounter parameters.
description: 15 pages, submitted to A&A
Intensity-hardness correlation and deep infrared observation of the anomalous X-ray pulsar 1RXS J170849-400910
Creators: name: Rea, N.
name: Israel, G. L.
name: Oosterbroek, T.
name: Campana, S.
name: Zane, S.
name: Turolla, R.
name: Testa, V.
name: Mendez, M.
name: Stella, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report here on X-ray and IR observations of the Anomalous X-ray Pulsar 1RXS J170849-400910. First, we report on new XMM-Newton, Swift-XRT and Chandra observations of this AXP, which confirm the intensity-hardness correlation observed in the long term X-ray monitoring of this source by Rea et al. (2005). These new X-ray observations show that the AXP flux is rising again, and the spectrum hardening. If the increase in the source intensity is indeed connected with the glitches and a possible bursting activity, we expect this source to enter in a bursting active phase around 2006-2007. Second, we report on deep IR observations of 1RXS J170849-400910, taken with the VLT-NACO adaptive optics, showing that there are many weak sources consistent with the AXP position. Neither star A or B, previously proposed by different authors, might yet be conclusively recognised as the IR counterpart of 1RXS J170849-400910. Third, using Monte Carlo simulations, we re-address the calculation of the significance of the absorption line found in a phase-resolved spectrum of this source by Rea et al. (2003), and interpreted as a resonant scattering cyclotron feature.
description: 7 pages, 5 color figures; Astrophysics & Space Science, in press ("Isolated Neutron Stars"; London, UK)
Elicitation of animacy effects
Creators: name: Parker, Verdena
name: Demitrescu, Suzi
name: Escamilla, Ramón
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-080809-01: Elicitation of animacy hierarchy effects, based on sentences from texts in Sapir and Golla (2001).
Οι παλιννοστούντες εκπαιδευτικοί από την πρώην Σοβιετική Ενωση και η απαξίωσή τους
Creators: name: Αβραμίδης, Κωνσταντίνος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Παλιννοστούντες
Αποκλεισμένοι
Ρατσισμός
Γκουμπάτη
Ταρσόν
Σοβιετική Ενωση
Repatriated
Deprevation
Racism
Goubati
Tarson
Soviet Union

description: Μετά την κατάρρευση της Σοβιετικής Ενωσης ένα μεγάλο κομμάτι του ελληνισμού που ζούσανε σε διάφορες σοβιετικές δημοκρατίες της Σοβιετικής Ενωσης (περίπου 210.000 έλληνες και ελληνίδες βάση της απογραφής της Γενικής Γραμματείας Παλιννοστούντων Ομογενών του Υπουργείο Μακεδονίας-Θράκης και προσωπικής μου εκτίμησεις) επέστρεψε στην εθνική του πατρίδα. Ενα μεγάλο κομμάτι του νεοφερμένου ελληνισμού αποτελούσαν επιστήμονες, πτυχιούχοι, εκπαιδευτικοί, οι οποίοι κι αυτοί με τη σειρά τους από τις πρώτες κιόλας μέρες, αντίκρισαν το σκληρό πρόσωπο του κοινωνικού αποκλεισμού το οποίο για αυτούς ήταν ένα άγνωστο φαινόμενο. Παρουσιάζονται εν συντομία κάποια ιστορικά στοιχεία της Σοβιετικής Ενωσης, οι δημοκρατίες που την αποτελούσαν καθώς και στοιχεία για τον ελληνισμό που ζούσε στα όριά της. Γίνεται μια αποσαφήνιση του όρου "παλιννόστηση". Στη συνέχεια παρουσιάζονται τα προβλήματα των παλιννοστούντων και ο κοινωνικός ρατσισμός σε σχέση με τα μέσα μαζικής ενημέρωσης. Στο τέλος επικεντρώνεται στον κοινωνικό αποκλεισμό και την απαξίωση των επιστημόνων και των εκπαιδευτικών από την πρώην Σοβιετική Ενωση.
description: After the collapse of the Soviet Union a big part of Hellenism who lived in different Soviet republics of the Soviet Union (about 210,000 Greek men and women according to the inventory of the General Secretariat for repatriating the Diaspora Ministry of macedonia-Thrace and my personal estimate) returned to the national homeland. A large piece of the newcomers were Greek scientists, graduates, teachers, who too are in turn from the first few days, check the hard face of social exclusion which for them was an unknown phenomenon. Briefly presented some historical data of the Soviet Union, the republics that constituted and information on living Hellenism its limits. There is a clarification of the term "return". The following are the problems of returnees and social racism in relation to the media. At the end focuses on social exclusion and depreciation of scientists and teachers from the former Soviet Union.
Variable Petri Nets for Mobility
Creators: name: Ding, Zhijun
name: Yang, Ru
name: Cui, Puwen
name: Zhou, MengChu
name: Jiang, Changjun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Formal Languages and Automata Theory (cs.FL)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Mobile computing systems, service-based systems and some other systems with mobile interacting components have recently received much attention. However, because of their characteristics such as mobility and disconnection, it is difficult to model and analyze them by using a structure-fixed model. This work proposes a new Petri net model called Variable Petri Net (VPN) for modeling and analyzing these systems. The definition, firing rule, and related analysis technology of VPN are introduced in detail. In a VPN, the possible interaction interfaces are abstracted as a new kind of places called virtual places, and the occurrences of (dis)connections are described by new functions, which makes it appropriate to describe the component collaboration in systems and realize the scalability and pluggability of systems. Moreover, to overcome the shortcoming that markings cannot reflect link capability of a system, VPNs add a constraint function along with a marking to represent a complete system configuration. Several examples are used to demonstrate the newly proposed model and method.
description: 13 pages, submitted to IEEE Transactions on Systems, Man, and Cybernetics: Systems
Deconfinement Phase Transition under Chemical Equilibrium
Creators: name: Dexheimer, Veronica
name: Aryal, Krishna
name: Wolf, Madison
name: Constantinou, Constantinos
name: Farias, Ricardo L. S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we investigate how the assumption of chemical equilibrium with leptons affects the deconfinement phase transition to quark matter. This is done within the framework of the Chiral Mean Field model (CMF) allowing for non-zero net strangeness, corresponding to the conditions found in astrophysical scenarios. We build 3-dimensional QCD phase diagrams with temperature, baryon chemical potential, and either charge or isospin fraction or chemical potential to show how the deconfinement region collapses to a line in the special case of chemical equilibrium, such as the one established the interior of cold catalyzed neutron stars.
Επίδραση του υποκειμένου σε μερικές παραμέτρους ποιότητας της ποικιλίας αμπέλου Cabernet Sauvignon:
Creators: name: Μπακρατσά, Γλυκερία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Αμπελος
Υδατική καταπόνηση
Υποκείμενα αμπέλου
Ισότοπα άνθρακα
Αποτελεσματικότητα χρήσης νερού
Υδατικό δυναμικό
Water use efficiency
Stem water potential
Rootstocks

description: Στα πλαίσια του πειραματισμού μελετήθηκε η επίδραση του υποκειμένου στην ποικιλία της αμπέλου Cabernet Sauvignon σε συνθήκες διαφορετικής παροχής νερού. Για το σκοπό αυτό χρησιμοποιήθηκαν 2 υποκείμενα το SO4 που είναι υποκείμενο ευαίσθητο στην χαμηλή εδαφική υγρασία και το 1103P που είναι ανθεκτικό στην χαμηλή εδαφική υγρασία, λόγω μεγαλύτερης πυκνότητας του ριζικού συστήματος, τα οποία υποβλήθηκαν σε 3 διαφορετικά υδατικά καθεστώτα με στόχο τη διερεύνηση των επιδράσεων σε μερικές φυσιολογικές παραμέτρους της φυσιολογίας της αμπέλου και της ποσότητας και ποιότητας παραγωγής.
description: Water is the most limiting resource for viticulture in the mediterranean region where vines are often exposed to extreme water deficits during the growth period grapevine respond to water stress with a variety of physiological and molecular mechanisms. The aim of this study was to evaluate the effect of two rootstocks (1103P and SO4) and three irrigations levels (100% ETc, 50% ETc and 0% ETc) on physiology and quality of Cabernet Sauvignon grapes.
Characterizations of algebras of rapidly decreasing generalized functions
Creators: name: Bouzar, C.
name: Saidi, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 46F30, 46F05, 42B10

description: The well-known characterizations of Schwartz space $\mathcal{S}$ of rapidly decreasing functions is extended to the algebra $\mathcal{G}_{\mathcal{S}}$ of rapidly decreasing generalized functions and to the algebra $\mathcal{G}_{% \mathcal{S}}^{\infty}$ of regular rapidly decreasing generalized functions.
Συγκριτική μελέτη σχεδίασης στοιχειοκεραιών με χρήση μεθόδων ορθοκανονικοποίησης:
Creators: name: Βαγενάς, Στέφανος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Σχεδίαση κεραιών
Ορθοκανονικοποίηση
Αλγόριθμος Gram-Schmidt
Array synthesis
Orthogonal method
Gram Schmidt algorithm
Modified Gram Schmidt
Reorthogonalization

description: Στην παρούσα εργασία εξετάζονται οι διάφορες μέθοδοι ορθοκανονικοποίησης, όπως αυτές εφαρμόζονται στο πρόβλημα της σχεδίασης κεραιών. Συγκεκριμένα, παρουσιάζονται και συγκρίνονται η κλασσική μέθοδος ορθοκανονικοποίησης Gram-Schmidt, η τροποποιημένη (modified) μέθοδος ορθοκανονικοποίησης Gram-Schmidt και η τεχνική της επανορθογωνιοποίησης (re-orthogonalization).Παρουσιάζεται ο τρόπος με τον οποίο οι διάφορες μορφές του αλγορίθμου ορθοκανονικοποίησης Gram-Schmidt εφαρμόζονται στη σχεδίαση μιας κεραίας. Επίσης, μελετάται η αριθμητική ευστάθεια της κάθε μεθόδου. Για κάθε μέθοδο προσδιορίζεται το όριο ορθής λειτουργίας, πέρα από το οποίο η εκάστοτε μέθοδος αποτυγχάνει να προσεγγίσει με ικανοποιητική ακρίβεια το επιθυμητό διάγραμμα ακτινοβολίας της υπό σχεδίασης κεραίας. Το όριο αυτό είναι συνάρτηση του αριθμού των πηγών της κεραίας και της ισαπόστασης μεταξύ τους. Επιπρόσθετα, για κάθε σχεδιαστική περίπτωση δίνεται καλύτερη μέθοδος, δηλαδή η μέθοδος, που συνοδεύεται με το μικρότερο μέσο τετραγωνικό σφάλμα στην προσέγγιση του επιθυμητού διαγράμματος ακτινοβολίας. Τέλος, μελετάται η μορφή των ρευμάτων διέγερσης των πηγών μιας κεραίας για συγκεκριμένες σχεδιαστικές περιπτώσεις.Με βάση τη συμμετρία, που εμφανίζεται στα ρεύματα διέγερσης, δημιουργούνται μέθοδοι, οι οποίοι αποσκοπούν στην εξασφάλιση της συγκεκριμένης συμμετρίας. Για τις μεθόδους αυτές ελέγχεται η απόδοσή τους.
description: Orthogonalization methods for array synthesis are presented in this study. The classical Gram-Schmidt orthogonalization procedure is described. Moreover, the modified Gram-Schmidt orthogonalization procedure is explained. Finally, the technique of re-orthogonalization is given. Orthogonal methods are combined when they are used in antenna synthesis problems. For different design cases the best method is given. Furthermore, the numerical stability of each algorithm is studied. Depending on the number of sources and the mean distance between them, the limit of correct operation for each method is different. This limit will be presented and will show the usefulness of the modified method combined with the re-orthogonalization technique. Also, the form of the excitation coefficients is studied for specific design cases. Based on the symmetry that it is appeared, methods, which ensure the symmetry of the excitation coefficients, are developed. These methods are evaluated.
High-order harmonic generation in solid $\rm \bf C_{60}$
Creators: name: Zhang, G. P.
name: Bai, Y. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: High harmonic generation (HHG) has unleashed the power of strong laser physics in solids. Here we investigate HHG from a large system, solid C$_{60}$, with 240 valence electrons engaging harmonic generation at each crystal momentum, the first of this kind. We employ the density functional theory and the time-dependent Liouville equation of the density matrix to compute HHG signals. We find that under a moderately strong laser pulse, HHG signals reach 15th order, consistent with the experimental results from C$_{60}$ plasma. The helicity dependence in solid C$_{60}$ is weak, due to the high symmetry. In contrast to the general belief, HHG is unsuitable for band structure mapping in C$_{60}$. However, we find a window of opportunity using a long wavelength, where harmonics are generated through multiple-photon excitation. In particular, the 5th order harmonic energies closely follow the transition energy dispersion between the valence and conduction bands. This finding is expected to motivate future experimental investigations.
description: 7 pages, 4 figures, one table
Light-driven global illumination with a wavelet representation of light transport
Creators: name: Lewis, Robert R.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis considers the problem of global illumination: the modelling of light as it travels through a scene interacting with the objects contained within the scene. Starting with a description of the problem and a discussion of previous work, we explore a new approach called light-driven global illumination that offers several advantages over its predecessors: a lower asymptotic complexity, a wider range of representable surface interaction phenomena, and an absence of the need for "meshing" - object surface subdivision needed primarily to represent shadows. Light-driven global illumination is intermediate between local and global illumination. Representing light with wavelet basis functions, we are able to treat both the interaction between two surfaces and the interaction of a surface with a radiation field in a source-to-destination model that applies to whole surfaces, not just small elements. We have found this "wavelet radiative transfer" to be a valid way to generate and store complex global light field data as four-dimensional textures for incorporation in local illumination solutions. Wavelets can considerably reduce the otherwise substantial storage and reconstruction problems associated with doing this. We include several examples of this. We also discuss plausible illumination models, which are required to make light-driven global illumination work theoretically. Like wavelet radiative transfer, these models have application in other areas of rendering besides global illumination. Finally, we develop the theory behind light-driven global illumination and apply it successfully to some simple examples. While we find the algorithm to be quite slow compared to other well-known rendering algorithms, we analyze what is needed to make it competitive. In conclusion, we find that representing light with wavelets has a set of advantages that are independent of the comparative inefficiency of the light-driven algorithm.
A Comprehensive Study of the Three- and Four-Neutron Systems at Low Energies
Creators: name: Higgins, Michael D.
name: Greene, Chris H.
name: Kievsky, Alejandro
name: Viviani, Michele
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This work presents further analysis of the three- and four-neutron systems in the low energy regime using adiabatic hyperspherical methods. In our previous Phys. Rev. Lett. article (Phys. Rev. Lett. 125, 052501 (2020)), the low-energy behavior of these neutron systems was treated in the adiabatic approximation, neglecting the off-diagonal non-adiabatic couplings. A thorough analysis of the density of states through a multi-channel treatment of the three-and four-neutron scattering near the scattering continuum threshold is performed, showing no evidence of a 4n resonance at low energy. A detailed analysis of the long-range behavior of the lowest few adiabatic hyperspherical potentials shows there is an attractive $ρ^{-3}$ universal behavior which dominates in the low-energy regime of the multi-channel scattering. This long-range behavior leads to a divergent behavior of the density of state for $E\rightarrow0$ that could account for the low-energy signal observed in the 2016 experiment by Kisamori et al. (Phys. Rev. Lett. 116, 052501 (2016)).
Το επιμορφωτικό έργο των σχολικών συμβούλων: θεωρητική και εμπειρική προσέγγιση
Creators: name: Ναθαναήλ, Πασχαλιά Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Σχολικοί σύμβουλοι
Επιμόρφωση
Ανάλυση περιεχομένου
Εκπαίδευση
Εκπαιδευτική πολιτική
School advisors
In service training
Analysis of the content
Education
Educational policy

description: Με την παρούσα εργασία γίνεται προσπάθεια γίνεται προσπάθεια να διερευνηθούν οι απόψεις και οι αντιλήψεις των σχολικών συμβούλων των δύο βαθμίδων εκαπίδευσης (Πρωτοβάθμιας και Δευτεροβάθμιας) του Νομού Θεσσαλονίκης αναφορικά με την επιμόρφωση των εκπαιδευτικών από τους ίδιους. Η ανάλυση του υλικού της έρευνας και η συζήτηση των πορισμάτων της στηρίχτηκε στην ποιοτική ανάλυση περιεχομένου. Συμπερασματικά, διαπιστώνεται, μεταξύ των άλλων ότι οι σχολικοί σύμβουλοι οργανώνουν και υλοποιούν επιμορφωτικά προγράμματα, με σκοπό την ποιοτική αναβάθμιση του έργου του εκπαιδευτικού της σχολικής μονάδας και της σχολικής εκπαίδευσης γενικότερα.
description: An effort is being made with this project to investigate the viewpoints and the perception of state school advisors in both grades of education (First and Secondary degree) in the perfecture of Thessaloniki, relating to in-service training of teachers from them. The analysis of the material of this investigation and the discussion of the findings was based on a qualitative summary analysis of the content. To conclude, it is discovered, in alia, that state school advisors organize and materialize in-service training programs in order to upgrade the quality of teachers work in the school unit and in education in general.
Predicting the Critical Number of Layers for Hierarchical Support Vector Regression
Creators: name: Mohr, Ryan
name: Fonoberova, Maria
name: Drmač, Zlatko
name: Manojlović, Iva
name: Mezić, Igor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: I.5.2; F.2.1; G.1.3; G.1.6
subject: 68Q32, 68T05, 68T07, 37M05, 37M10, 37M25

description: Hierarchical support vector regression (HSVR) models a function from data as a linear combination of SVR models at a range of scales, starting at a coarse scale and moving to finer scales as the hierarchy continues. In the original formulation of HSVR, there were no rules for choosing the depth of the model. In this paper, we observe in a number of models a phase transition in the training error -- the error remains relatively constant as layers are added, until a critical scale is passed, at which point the training error drops close to zero and remains nearly constant for added layers. We introduce a method to predict this critical scale a priori with the prediction based on the support of either a Fourier transform of the data or the Dynamic Mode Decomposition (DMD) spectrum. This allows us to determine the required number of layers prior to training any models.
description: 18 pages, 9 figures
Quantum electrodynamics of heavy ions and atoms
Creators: name: Shabaev, V. M.
name: Artemyev, A. N.
name: Glazov, D. A.
name: Tupitsyn, I. I.
name: Volotka, V. A.
name: Yerokhin, V. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The present status of quantum electrodynamics (QED) theory of heavy few-electron ions is reviewed. The theoretical results are compared with available experimental data. A special attention is focused on tests of QED at strong fields and on determination of the fundamental constants. A recent progress on calculations of the QED corrections to the parity nonconserving 6s-7s transition amplitude in neutral Cs is also discussed.
description: Talk at ICAP 2006, Innsbruck, Austria
Trace anomaly for Weyl fermions using the Breitenlohner-Maison scheme for $γ_*$
Creators: name: Abdallah, S.
name: Franchino-Viñas, S. A.
name: Fröb, M. B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit the computation of the trace anomaly for Weyl fermions using dimensional regularization. For a consistent treatment of the chiral gamma matrix $γ_*$ in dimensional regularization, we work in $n$ dimensions from the very beginning and use the Breitenlohner-Maison scheme to define $γ_*$. We show that the parity-odd contribution to the trace anomaly vanishes (for which the use of dimension-dependent identities is crucial), and that the parity-even contribution is half the one of a Dirac fermion. To arrive at this result, we compute the full renormalized expectation value of the fermion stress tensor to second order in perturbations around Minkowski spacetime, and also show that it is conserved.
description: 33 pages
J/psi Production in sqrt (s_NN)= 200 GeV Cu+Cu Collisions
Creators: name: PHENIX Collaboration
name: Adare, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Yields for J/psi production in Cu+Cu collisions at sqrt (s_NN)= 200 GeV have been measured by the PHENIX experiment over the rapidity range |y| < 2.2 at transverse momenta from 0 to beyond 5 GeV/c. The invariant yield is obtained as a function of rapidity, transverse momentum and collision centrality, and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data provide greatly improved precision over existing Au+Au data for J/psi production in collisions with small to intermediate numbers of participants, providing a key constraint that is needed for disentangling cold and hot nuclear matter effects.
description: 375 authors from 57 institutions, 6 pages, 4 figures, 1 table. Published in Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/papers.html v2 has minor changes made during the PRL review process
Constraints on primordial black holes and curvature perturbations from the global 21cm signal
Creators: name: Yang, Yupeng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The recent observations of the global 21cm signal by EDGES and gravitational waves by LIGO/VIGO have revived interest in PBHs. Different from previous works, we investigate the influence of PBHs on the evolution of the IGM for the mass range $6\times 10^{13} {\rm g} \lesssim M_{\rm PBH}\lesssim 3\times 10^{14} \rm g$. Since the lifetime of these PBHs is smaller than the present age of the Universe, they have evaporated by the present day. Due to Hawking radiation, the heating effects of PBHs on the IGM can suppress the absorption amplitude of the global 21cm signal. In this work, by requiring that the differential brightness temperature of the global 21cm signals in the redshift range of $10\lesssim z \lesssim 30$, e.g., $δT_{b} \lesssim -100~\rm mK$, we obtain upper limits on the initial mass fraction of PBHs. We find that the strongest upper limit is $β_{\rm PBH} \sim 2\times 10^{-30}$. Since the formation of PBHs is related to primordial curvature perturbations, by using the constraints on the initial mass fraction of PBHs we obtain the upper limits on the power spectrum of primordial curvature perturbations for the scale range $8.0\times 10^{15}\lesssim k \lesssim 1.8\times 10^{16}~\rm Mpc^{-1}$, corresponding to the mass range considered here. We find that the strongest upper limit is $\mathcal P_{\mathcal R}(k) \sim 0.0046$. By comparing with previous works, we find that for the mass range (or the scale range) investigated in this work the global 21cm signals or the 21cm power spectrum should give the strongest upper limits on the initial mass fraction of PBHs and on the power spectrum of primordial curvature perturbations.
description: 10pages, 4 figure, comments welcome
Η ποιμαντική δράση των ρουμάνων ιερέων στο στρατό στον Α΄και Β΄παγκόσμιο πόλεμο:
Creators: name: Κάσου, Αλέξανδρος Βίκτωρ (Casu, Alenadriu Victor)
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Στρατός
Εκκλησία
Πόλεμος
Διακονία
Army
Church
War
Diakonia

description: Κατά το χρονικό διάστημα που εκτυλίχθηκε ο Α' και Β' Παγκόσμιος Πόλεμος η Εκκλησία κλήθηκε να αντιμετωπίσει τις ποιμαντικές ανάγκες του στρατού. Η Εκκλησία χρησιμοποίησε τα πάντα για την υλική ενίσχυση της εθνικής εξόρμησης και ειδικότερα την συμπαράσταση των οικογενειών που είχαν δικούς τους ανθρώπους στο στρατό. Ειδικότερα η ποιμαντική βοήθεια της Εκκλησίας ήταν σημαντική μέσα από το έργο των ιερέων στο στρατό που έκαναν το παν για να υποστηρίζουν, πνευματικά και υλικά τους στρατιώτες. Η σημαντική αυτή προσφορά της Ορθόδοξης Εκκλησίας της Ρουμανίας, η οποία ποτέ δεν απουσίαζε από τους εθνικούς αγώνες δεν έχει σημειωθεί μέχρι σήμερα δεόντως και δεν έχει ιστορηθεί επαρκώς.
description: At the time interval that unfolded the A and B World War the Church of Romania was called to face poimantikes needs of army. The Church used everything for the material aid of national campaign and more specifically the support of families that had their own persons the army. More specifically the poimantiki help of church was import through the work of priests army that made the in order to they support, spirit and materially the soldiers. This important offer of Orthodox Church of Romania, which never was not absent the national fights has not been marked up to today and it does not have storia sufficiently.
Decorated vertices with 3-edged cells in 2D foams: exact solutions and properties
Creators: name: Mancini, Marco
name: Oguey, Christophe
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The energy, area and excess energy of a decorated vertex in a 2D foam are calculated. The general shape of the vertex and its decoration are described analytically by a reference pattern mapped by a parametric Moebius transformation. A single parameter of control allows to describe, in a common framework, different types of decorations, by liquid triangles or 3-sided bubbles, and other non-conventional cells. A solution is proposed to explain the stability threshold in the flower problem.
description: 13 pages, 17 figures
Endogenic and Exogenic Contributions to Visible-wavelength Spectra of Europa's Trailing Hemisphere
Creators: name: Trumbo, Samantha K.
name: Brown, Michael E.
name: Hand, Kevin P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The composition of Europa's trailing hemisphere reflects the combined influences of endogenous geologic resurfacing and exogenous sulfur radiolysis. Using spatially resolved visible-wavelength spectra of Europa obtained with the Hubble Space Telescope, we map multiple spectral features across the trailing hemisphere and compare their geographies with the distributions of large-scale geology, magnetospheric bombardment, and surface color. Based on such comparisons, we interpret some aspects of our spectra as indicative of purely exogenous sulfur radiolysis products and other aspects as indicative of radiolysis products formed from a mixture of endogenous material and magnetospheric sulfur. The spatial distributions of two of the absorptions seen in our spectra -- a widespread downturn toward the near-UV and a distinct feature at 530 nm -- appear consistent with sulfur allotropes previously suggested from ground-based spectrophotometry. However, the geographies of two additional features -- an absorption feature at 360 nm and the spectral slope at red wavelengths -- are more consistent with endogenous material that has been altered by sulfur radiolysis. We suggest irradiated sulfate salts as potential candidates for this material, but we are unable to identify particular species with the available data.
description: 10 pages, 1 table, 5 figures, published in The Astronomical Journal
Διαθρησκειακός διάλογος και Οικουμενικό Πατριαρχείο
Creators: name: Καραδημήτρη-Στεφανίδου, Μαρία Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Διαθρησκειακός διάλογος
Οικουμενικό Πατριαρχικό
Ισλάμ
Ιουδαϊσμός
Ιεραποστολή
ΠΣΕ (Παγκόσμιο Συμβούλιο Εκκλησιών)
Interreligous dialogue
Oecumenical Patriarchate
Islam
Judaism
Mission
WCC (World Council of Churches)

description: Η μεταπτυχιακή μου εργασία αναφέρεται στο ρόλο του Οικουμενικού Πατριαρχείου στην Ορθοδοξία, στους Διαθρησκειακούς Διαλόγους με το Ισλάμ και τους Ιουδαίους μέχρι και σήμερα, στην Ιεραποστολή και στο Παγκόσμιο Συμβούλιο Εκκλησιών (ιστορική του διαδρομή).
description: La these de mon DEA s' agir du role du patriarghat Oecumenique par rapport l' orthodoxie, le dialogue entre les religions (l'islam et le judaisme) jusqua maintenaut, la mission et le WCC (son histoire)
On chromonatural inflation in string theory
Creators: name: Holland, Jonathan
name: Zavala, Ivonne
name: Tasinato, Gianmassimo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Sourced gravitational waves in chromonatural inflation (CNI) can give rise to a chiral spectrum of tensor fluctuations that is considerably enhanced relative to the vacuum fluctuations. If the field content of CNI acts purely as a spectator (SCNI), the inflationary sector can be consistent with current data making SCNI very appealing in view of future observations. We investigate the prospects of embedding SCNI in string theory, in the framework of Kähler inflation in type IIB large volume string compactifications, with a spectator sector associated with gaugino condensation on multiply magnetised D7-branes. We first introduce a generalised field theory framework that describes non-trivial multifield inflation coupled to gauge fields of the form generically arising in supergravity and string theory. We then use these results to study numerically and analytically both the background evolution and the dynamics of cosmological perturbations. We show that a successful inflationary background evolution with a large enhancement of the gravitational wave spectrum and a controllable backreaction from the amplified tensor fluctuations can be achieved by considering suitable values of three parameters present in our scenario: the magnetic flux, the degree of the condensing gauge group and the wrapping number of the D7-brane. On the other hand, the required values for these quantities may present a challenge for its successful realisation within string theory. We also discuss these challenges and the model from the viewpoint of the weak gravity conjecture.
description: 43 pages, 21 figures. References updated, typos corrected
Ο λόγος του ακροδεξιού τύπου για την ιδιωτικοποίηση της εκπαίδευσης: Μελέτη περίπτωσης: Ο λόγος της εφημερίδας Α1 σε σχέση με την αναθεώρηση του άρθρου 16 και τις εκπαιδευτικές κινητοποιήσεις Ιανουαρίου-Μαρτίου 2007
Creators: name: Χατζηκώστας, Δημήτριος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Ακροδεξιά
Εκπαιδευτική μεταρρύθμιση
Νεοφιλελευθερισμός
Νεοσυντηρητισμός
Λαϊκισμός
Far right
Educational reform
Neoliberalism
Neoconservatism
Populism

description: Στην παρούσα εργασία εξετάζουμε το λόγο της σύγχρονης ελληνικής ακροδεξιάς όταν έρχεται αντιμέτωπη με ένα κοινωνικό κίνημα στο χώρο της ανώτατης εκπαίδευσης. Πιο συγκεκριμένα εξετάζουμε τις σχέσεις ανταγωνισμού ανάμεσα στις ομάδες «εμείς» και «οι άλλοι» καθώς και τα στοιχεία νεοφιλελεύθερου, νεοσυντηρητικού και λαϊκιστικού λόγου που αναδεικνύονται από την αρθρογραφία της εφημερίδας Α1.
description: In this essay we examine the modern, Greek far-right discourse when it faces a social movement related with the higher education. Especially, we examine the tension relations between ingrous and outgroups as far as elements of neoliberal, neoconservative and populist discourse that are risen from the rank of A1 newspaper articles
Transcription of "Pingu in the Ice Cave"
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-150309-08: Transcription of the narration of Pingu and the Ice Cave (file VP-181008-04), from 4:22 to 5:10.
Structural and Magnetic Characterization of CuxMn1-xFe2O4 (x= 0.0, 0.25) Ferrites Using Neutron Diffraction and Other Techniques
Creators: name: Elius, I. B.
name: Zakaria, A. K. M.
name: Maudood, J.
name: Hossain, S.
name: Islam, M. M.
name: Nahar, A.
name: Hossain, Md Sazzad
name: Kamal, I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Manganese ferrite (MnFe2O4) and copper doped manganese ferrite (Mn0.75Cu0.25Fe2O4) soft materials were synthesized through solid-state sintering method. The phase purity and quality were confirmed from x-ray diffraction patterns. Then the samples were subjected to neutron diffraction experiment and the diffraction data were analyzed using FullProf software package. The surface morphology of the soft material samples was studied using a scanning electron microscope (SEM). Crystal parameters, crystallite parameters, occupancy at A and B sites of the spinel structure, magnetic moments of the atoms at various locations, symmetries, oxygen position parameters, bond lengths etc. were measured and compared with the reference data. In MnFe2O4, both octahedral (A) and tetrahedral (B) positions are shared by Mn2+ and Fe2+/3+ cations, here A site is predominantly occupied by Fe2+ and B site is occupied by Mn at 0.825 occupancy. The Cu2+ ions in Cu0.25Mn0.75Fe2O4 mostly occupy the B site. Copper mostly occupy the Octahedral (16d) sites. The length of the cubic lattice decreases with the increasing Copper content. The magnetic properties, i.e. A or B site magnetic moments, net magnetic moment etc. were measured using neutron diffraction analysis and compared with the bulk magnetic properties measured with VSM studies.
Transcription of "The North Wind and Sun"
Creators: name: Parker, Verdena
name: Escamilla, Ramón
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-150309-07: Transcription of the Hupa translation of the North Wind and Sun story (file VP-181008-07).
SChuBERT: Scholarly Document Chunks with BERT-encoding boost Citation Count Prediction
Creators: name: van Dongen, Thomas
name: Wenniger, Gideon Maillette de Buy
name: Schomaker, Lambert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: I.2.7

description: Predicting the number of citations of scholarly documents is an upcoming task in scholarly document processing. Besides the intrinsic merit of this information, it also has a wider use as an imperfect proxy for quality which has the advantage of being cheaply available for large volumes of scholarly documents. Previous work has dealt with number of citations prediction with relatively small training data sets, or larger datasets but with short, incomplete input text. In this work we leverage the open access ACL Anthology collection in combination with the Semantic Scholar bibliometric database to create a large corpus of scholarly documents with associated citation information and we propose a new citation prediction model called SChuBERT. In our experiments we compare SChuBERT with several state-of-the-art citation prediction models and show that it outperforms previous methods by a large margin. We also show the merit of using more training data and longer input for number of citations prediction.
description: Published at the First Workshop on Scholarly Document Processing, at EMNLP 2020. Minor corrections were made to the workshop version, including addition of color to Figures 1,2
Η νεκρομαντεία στους Πέρσες του Αισχύλου:
Creators: name: Βασιλείου, Βασίλειος Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Νεκρομαντεία
Πέρσες
Αισχύλος
Χοές
Προφητεία
Σαλαμίνα
Necromancy
Persae
Aeschylus
Libations
Prophecy
Salamis

description: Στο πλαίσιο της παρούσας εργασίας στο επίκεντρο του ενδιαφέροντός μας τίθεται η τραγωδία του Αισχύλου «Πέρσαι» και συγκεκριμένα η πολύ γνωστή σκηνή της νεκρομαντείας (στ. 598-851). Κατά τη διάρκεια της σκηνής αυτής, η βασίλισσα των Περσών προσφέρει χοές στους χθόνιους θεούς και στο νεκρό σύζυγό της, Δαρείο, ενώ ο Χορός καλεί το πνεύμα του Δαρείου να εμφανιστεί στον Πάνω Κόσμο. Η παρουσία του είναι απαραίτητη, επειδή είναι ο μόνος που μπορεί να συμβουλεύσει τους Πέρσες μετά την ήττα τους κατά τη ναυμαχία της Σαλαμίνας (480 π.Χ.). Στο πρώτο κεφάλαιο, μετά από μία σύντομη εισαγωγή στη νεκρομαντεία, επιχειρείται μία συγκριτική παρουσίαση των σκηνών νεκρομαντείας που εντοπίζουμε στον Όμηρο, τον Αισχύλο και το Λουκιανό, ενώ στο δεύτερο παρουσιάζουμε τη δομή της αισχύλειας σκηνής νεκρομαντείας. Στο τρίτο κεφάλαιο επικεντρώνουμε την προσοχή μας στην εμφάνιση του Δαρείου και ειδικότερα σε ορισμένες αντιφάσεις που έχουν επισημανθεί στο λόγο του από μερίδα των μελετητών και στο τέταρτο εξετάζουμε το ζήτημα που προκύπτει σχετικά με τους παραλήπτες των χοών που προσφέρει η βασίλισσα. Στο πέμπτο κεφάλαιο μας απασχολούν δύο ζητήματα που εγείρονται μέσα από το δεύτερο στάσιμο, ενώ στο έκτο και τελευταίο κεφάλαιο εστιάζουμε την προσοχή μας σε ορισμένες λέξεις, οι οποίες παρουσιάζουν ενδιαφέρον είτε λόγω της δυσκολίας τους είτε λόγω της σπανιότητάς τους.
description: In this dissertation we focus our interest on the tragedy ‘’The Persians’’ of Aeschylus and specifically on the very note scene of necromancy (vv. 598-851). During this scene, the queen of the Persians offers libations to the nether gods and to her dead husband, Dareios, while the Chorus evokes the spirit of Dareios, in order to appear in the Upper World. His presence is necessary, because he is the only one who can advise the Persians after their defeat in the sea fight of Salamis (480 B.C.). In the first chapter, after a brief introduction in the necromancy, we try to parallel this scene of necromancy with the scenes found in Homer and in Lucian. In the second chapter, we present the structure of the Aeschylian scene of necromancy and in the third one we focus our attention on the appearance of Dareios and specifically on some contradictions that have been noticed in his speech. In the forth chapter, we examine the matter which regards the recipients of the libations of the queen and in the fifth chapter we deal with two issues arising in the second stasimon. In the sixth and last chapter we cite some words of special interest either because of their difficulty either because of their rarity.
Αξιολόγηση τοπίου για την ανάπτυξη οικοτουρισμού και δασικής αναψυχής κατά μήκος διαδρομών των νομάδων στη Βόρεια Πίνδο
Creators: name: Γιαννακοπούλου, Αλεξία-Κυριακή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Μονοπάτι
Δασική αναψυχή
Βόρεια Πίνδος
Προστατευόμενη περιοχή
Οικοτουρισμός
Routes
Forest recreation
Ecotourism
North Pindos
Protected area

description: Τα τελευταία χρόνια έχει δοθεί μεγάλη σημασία στην προστασία και διατήρηση τόσο των φυσικών όσο και των πολιτιστικών πόρων της φύσης και στην ανάδειξη της αξίας τους, με συνέπεια ο σύγχρονος άνθρωπος να στρέφεται σε δραστηριότητες που αφενός προάγουν αυτές τις αξίες και αφετέρου επιδιώκουν την αειφορία. Ολοένα και περισσότερο εντείνονται οι περιηγήσεις και επισκέψεις σε φυσικές περιοχές καθώς και σε εθνικά πάρκα, στοχεύοντας τόσο στην απόλαυση και αναγνώριση της σημασίας της φύσης και της εγχώριας κουλτούρας, όσο και στην ανακάλυψη των παραδοσιακών στοιχείων και δραστηριοτήτων σε ορεινά χωριά και οικισμούς με τρόπο περιβαλλοντικά συνετό και υπεύθυνο. Οι εξορμήσεις αυτές πραγματοποιούνται μέσω διαδρομών και οργανωμένων μονοπατιών, πολλά από τα οποία είχαν διανοιχθεί από παλιότερα εθνικά φύλα για την εξυπηρέτησή τους στα πλαίσια άσκησης της κτηνοτροφίας. Στην παρούσα εργασία γίνεται μία προσπάθεια αξιολόγησης των ιδιαίτερων γεωμορφολογικών σχηματισμών του τοπίου, των φυσικών ιδιαιτεροτήτων, της ποικιλότητας της βλάστησης και των εναλλαγών του τοπίου που παρουσιάζονται κατά μήκος μίας διαδρομής, η οποία διέρχεται από χωριά της Βόρειας Πίνδου. Εξέχουσα σημασία αποτελούν και οι παραδοσιακές χρήσεις γης με τις οποίες ενασχολούνταν οι ντόπιοι κάτοικοι. Η περιοχή στην οποία ανήκει το μονοπάτι έχει ανακηρυχθεί θέση Δικτύου Natura 2000 και Εθνικό Πάρκο και επομένως υπόκειται στους νόμους των προστατευόμενων περιοχών. Παρουσιάζεται και αναδεικνύεται το φυσικό περιβάλλον και η αλληλεπίδρασή του με τους ντόπιους πληθυσμούς, σε μια μορφή που προσομοιάζει σε μείζονα βαθμό την κατάσταση που επικρατούσε στους παλαιότερους χρόνους. Στόχος και ελπίδα είναι η αξιοποίησή του από τους επισκέπτες και η εκπαίδευσή τους σε πρακτικές, ήθη και έθιμα που παραμένουν στο πέρας των χρόνων και καταδεικνύουν την αξία διατήρησης του φυσικού πλούτου και την σχέση του ανθρώπου με αυτόν.
description: In this paper we are attempting to evaluate the particular geomorphological formations of the landscape, the natural peculiarities, the diversity of the vegetation and the alternations of the landscape presented along a path that passes through the villages of North Pindos
VirJenDB: the comprehensive virus database based in Jena
Creators: name: Cassman, NA
name: Saghaei, S
name: Ziraksaz, H
name: Marz, M
Publisher: name: Zenodo
Year: 2023

description: Poster presented at the 2023 CORDI conference by Dr. Noriko Cassman about the VirJenDB, an NFDI4Microbiota service.
Practice educators’ and students’ themed narratives on social work student supervision
Creators: name: Beesley, Paula
Publisher: name: Leeds Beckett University
Year: 2024

description: This thesis considered what contributes to students’ development of knowledge and skills in social work student supervision. This is a protected time for students to explore their experiential learning from their practice within placement. Nevertheless, this is undertaken in a private space, so has rarely been subject to scrutiny. 

The uniqueness of this study is founded in two core differences. This is one of the first research studies to include both supervision participants’ perspectives and one of the first that observed social work student supervision, giving it a unique data perspective that enriched the significance of the findings. 

The methodology for this thesis was firmly rooted in a Narrative Inquiry, which enabled the use of a range of data collection methods. Eight social work student supervisions were observed and audio-recorded, and each supervision participant (practice educator and student) interviewed immediately afterwards to develop a significant data corpus. 

A thematic analysis approach identified two themes: diligence and collaboration. It was identified that where supervision participants had a diligent approach, which included being committed and organised, it enabled collaborative social work student supervision, which reduced the inherent power differential and enabled the development of students’ social work knowledge and skills. Implications are discussed that include both the importance of students understanding supervision as a site of the development of their knowledge and skills, and the development of positive social conditions in which both participants feel confident to contribute openly and honestly to develop students’ knowledge and skills. 

Finally, a model of development of knowledge and skills in social work student supervision was developed that incorporated the core themes of practice educator and student diligence and collaboration.
Double-peaked Oxygen Lines Are not Rare in Nebular Spectra of Core-Collapse Supernovae
Creators: name: Modjaz, Maryam
name: Kirshner, R. P.
name: Blondin, S.
name: Challis, P.
name: Matheson, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Double-peaked oxygen lines in the nebular spectra of two peculiar Type Ib/c Supernovae (SN Ib/c) have been interpreted as off-axis views of a GRB-jet or unipolar blob ejections. Here we present late-time spectra of 8 SN IIb, Ib and Ic and show that this phenomenon is common and should not be so firmly linked to extraordinary explosion physics. The line profiles are most likely caused by ejecta expanding with a torus- or disk-like geometry. Double-peaked oxygen profiles are not necessarily the indicator of a mis-directed GRB jet.
description: 5 pages, 3 figures, emulateapj, v2: accepted ApJ Letters version