cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Diverse polarization angle swings from a repeating fast radio burst source
Creators: name: Luo, R.
name: Wang, B. J.
name: Men, Y. P.
name: Zhang, C. F.
name: Jiang, J. C.
name: Xu, H.
name: Wang, W. Y.
name: Lee, K. J.
name: Han, J. L.
name: Zhang, B.
name: Caballero, R. N.
name: Chen, M. Z.
name: Chen, X. L.
name: Gan, H. Q.
name: Guo, Y. J.
name: Hao, L. F.
name: Huang, Y. X.
name: Jiang, P.
name: Li, H.
name: Li, J.
name: Li, Z. X.
name: Luo, J. T.
name: Pan, J.
name: Pei, X.
name: Qian, L.
name: Sun, J. H.
name: Wang, M.
name: Wang, N.
name: Wen, Z. G.
name: Xu, R. X.
name: Xu, Y. H.
name: Yan, J.
name: Yan, W. M.
name: Yu, D. J.
name: Yuan, J. P.
name: Zhang, S. B.
name: Zhu, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown origin. Two possible mechanisms that could generate extremely coherent emission from FRBs invoke neutron star magnetospheres or relativistic shocks far from the central energy source. Detailed polarization observations may help us to understand the emission mechanism. However, the available FRB polarization data have been perplexing, because they show a host of polarimetric properties, including either a constant polarization angle during each burst for some repeaters or variable polarization angles in some other apparently one-off events. Here we report observations of 15 bursts from FRB 180301 and find various polarization angle swings in seven of them. The diversity of the polarization angle features of these bursts is consistent with a magnetospheric origin of the radio emission, and disfavours the radiation models invoking relativistic shocks.
description: Published online in Nature on 29 Oct, 2020
Nonlinear hyperbolic systems: Non-degenerate flux, inner speed variation, and graph solutions
Creators: name: Glass, Olivier
name: LeFloch, Philippe G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 35L65; 76L05; 74J40

description: We study the Cauchy problem for general, nonlinear, strictly hyperbolic systems of partial differential equations in one space variable. First, we re-visit the construction of the solution to the Riemann problem and introduce the notion of a nondegenerate (ND) system. This is the optimal condition guaranteeing, as we show it, that the Riemann problem can be solved with finitely many waves, only; we establish that the ND condition is generic in the sense of Baire (for the Whitney topology), so that any system can be approached by a ND system. Second, we introduce the concept of inner speed variation and we derive new interaction estimates on wave speeds. Third, we design a wave front tracking scheme and establish its strong convergence to the entropy solution of the Cauchy problem; this provides a new existence proof as well as an approximation algorithm. As an application, we investigate the time-regularity of the graph solutions $(X,U)$ introduced by the second author, and propose a geometric version of our scheme; in turn, the spatial component $X$ of a graph solution can be chosen to be continuous in both time and space, while its component $U$ is continuous in space and has bounded variation in time.
description: 74 pages
title: Eine Interventionsstudie zum Thema Gesundheit im Sportunterricht : Evaluation eines kooperativen Planungsprozesses in der Health.edu-Studie
Creators: name: Ptack, Katharina
Publisher: name: University of Bayreuth
Year: 2019
Subjects: subject: Gesundheit
subject: Sportunterricht
subject: partizpativer Interventionsansatz
subject: symbiotische Implementation
subject: kooperative Planung
subject: gesundheitsbezogene Handlungsfähigkeit
subject: sportbezogene Gesundheitskompetenz
subject: handlungsleitende Kognitionen
subject: Mixed-Methods
subject: 790

description: Die Interventionsstudie zum Thema Gesundheit fokussiert zwei Phänomene: (1) Das didaktische Lehrkrafthandeln ist wichtiger Einflussfaktor für Schüler*innenlernen. (2) Aus der Schulforschung ist bekannt, dass Top-Down-Maßnahmen häufig nicht nachhaltig wirksam sind. Daher ist Ziel der Studie, didaktisches Lehrkrafthandeln mittels partizipativem Interventionsansatz im Sinne des sportdidaktischen Anspruchs zu verändern und so die sportbezogene Gesundheitskompetenz der Schüler*innen zu verbessern. Die einjährige Intervention bestand aus einer kooperativen Planung, bei der verschiedene Stakeholder (u.a. Sportlehrkräfte, Schüler*innen, Wissenschaftler*innen) Gesundheitsmaßnahmen für den Sportunterricht konzipierten und umsetzten. Die Evaluation verfolgt einen Mixed-Methods-Ansatz. Planungsprotokolle sowie Interviews und Videobeobachtungen von acht Lehrkräften (Pre-Post-Test-Design) wurden qualitativ inhaltsanalytisch ausgewertet, während die sportbezogene Gesundheitskompetenz der Schüler*innen (n=233) mit standardisiertem Fragebogen in einem Pre-Post-Test-Design quantitativ erfasst wurde. Die Ergebnisse zeigen, dass diejenigen Schüler*innen hinsichtlich der sportbezogenen Gesundheitskompetenz am meisten profitieren, die auf der einen Seite Lehrkräfte haben, die in der Lage sind, im Sportunterricht kompetenzorientierte Lehr-Lern-Situationen zu arrangieren und ein ganzheitliches, salutogenetisches und integratives Gesundheitsverständnis aufweisen und auf der anderen Seite eine Schule besuchen, in der ein partizipativer Planungsprozess aufgrund von Rahmenbedingungen umsetzbar ist. Die Ergebnisse bestätigen damit bisherige Befunde zur Bedeutung der Lehrkraftrolle für das Schüler*innenlernen und zeigen das Potential partizipativer Ansätze im Schulsetting.
Νοηματικός μουσειολογικός προγραμματισμός και σχεδιασμός έκθεσης της φωτογραφικής συλλογής Βύρωνα Μήτου
Creators: name: Καραμιχαήλ, Αναστασία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: μουσειολογία
έκθεση
φωτογραφία
museology
exhibition
photography

description: Βασισμένη σε πραγματικό θέμα, η παρούσα διπλωματική εργασία συνιστά νοηματική μουσειολογική μελέτη που αφορά στον προγραμματισμό και σχεδιασμό περιοδικής έκθεσης της φωτογραφικής συλλογής Βύρωνα Μήτου. Η συλλογή αποτελείται από φωτογραφίες Γερμανών στρατιωτών, οι οποίοι απαθανάτισαν με τον ατομικό τους φακό πρόσωπα και τοποθεσίες τις κατοχικής Θεσσαλονίκης (1941-1944). Το νόημα της έκθεσης που προτείνεται αρθρώνεται με αναφορές στη θεωρία της φωτογραφίας και έχει προσανατολισμούς κυριότερα ιστορικούς και ανθρωπολογικούς. Η εργασία έχει κλιμακωτή διάρθρωση και περιλαμβάνει τα εξής στάδια: α) μουσειολογική αναγνώριση, όπου παρατίθενται τα βασικά δεδομένα του προβλήματος, β) μουσειολογικό προγραμματισμό, όπου αναλύονται τα δεδομένα και τίθενται οι βασικές κατευθύνσεις για την επίλυση του προβλήματος και γ) μουσειολογικό σχεδιασμό, όπου περιγράφεται μία συγκεκριμένη λύση-πρόταση για έκθεση. Το παρόν τεύχος αποτελεί το ήμισυ μιας συνεργασίας που περιλαμβάνει νοηματικό και αρχιτεκτονικό προγραμματισμό και σχεδιασμό. Η χωρική απόδοση όσων αναπτύσσονται στο κύριο σώμα τις εργασίας απαντάται στο τεύχος του συναδέλφου αρχιτέκτονα Μιχαήλ Δολιανίτη.
description: Based on a real project, this thesis is a conceptual museological study regarding the planning and design of a temporary exhibition of the Byron Mitos’ photographic collection. This collection consists of photographs by German soldiers, who have captivated, with their own personal lens, faces and locations in the occupied area of Thessaloniki (1941-1944). The proposed concept is uttered through references to the theory of photography and follows principally historic and anthropological orientation. This thesis has a tiered structure and consists of the following stages: a) museological identification, where all the basic data of the project is quoted, b) museological planning, where data is analyzed and key directions towards problem solution are put and c) museological design, where a specific solution-proposal on the exhibition is described. This issue is one half of a partnership that includes conceptual and architectural planning and design. The spatial rendering of everything that is developed in the main body of this thesis is found on the issue edited by the fellow architect Michael Dolianitis.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
Invariants of 2 by 2 matrices, irreducible SL(2,C) characters and the Magnus trace map
Creators: name: Florentino, Carlos A. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14L30, 15A21, 20C15

description: We obtain an explicit characterization of the stable points of the action of G=SL(2,C) on the cartesian product G^n by simultaneous conjugation on each factor, in terms of the corresponding invariant functions, and derive from it a simple criterion for irreducibility of representations of finitely generated groups into G. We also obtain analogous results for the action of SL(2,C) on the vector space of n-tuples of 2 by 2 complex matrices. For a free group F_n of rank n, we show how to generically reconstruct the 2^{n-2} conjugacy classes of representations F_n -> G from their values under the map T_n : G^n = Hom(F_n,G) -> C^{3n-3} considered in [M], defined by certain 3n-3 traces of words of length one and two.
ТЎХТАМАС ИСЛОҲОТЛАР ЁШЛАР КЕЛАЖАГИГА МУСТАҲКАМ ЗАМИН ҲОЗИРЛАЙДИ
Creators: name: Сирожиддинов, Шуҳрат
Publisher: name: Academic Scientific Research
Year: 2024
Subjects: ёшлар
келажак
ёшлар дафтари
салоҳият

description: Инсонга ўз сўзини айтиш, истеъдод ва қобилиятини рўёбга чиқариш ва бу орқали ўзини дунёга намоён қилиш имконияти асосан ёшлик даврида берилади. Шу боис ҳам унутилмас лаҳзаларнинг энг завқлиси ёшлик хотиралари билан боғлиқ бўлади. Айнан шунинг учун ҳам бу даврни бебаҳо бойлик, дея таърифлаймиз. Бугун юртимизда ислоҳотлар эпкини ҳар бир инсонинг ҳаётига кириб борди, ҳар бир ҳудудга янгича руҳ олиб кирди. Мана шундай буюк ўзгаришлар нафасини энг кўп ҳис қилган ҳам айнан ёшлар қатлами, десак, муболаға бўлмайди.
Development of a Low-noise Front-end ASIC for CdTe Detectors
Creators: name: Kawamura, Tenyo
name: Orita, Tadashi
name: Takeda, Shin'ichiro
name: Watanabe, Shin
name: Ikeda, Hirokazu
name: Takahashi, Tadayuki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present our latest ASIC, which is used for the readout of Cadmium Telluride double-sided strip detectors (CdTe DSDs) and high spectroscopic imaging. It is implemented in a 0.35 um CMOS technology (X-Fab XH035), consists of 64 readout channels, and has a function that performs simultaneous AD conversion for each channel. The equivalent noise charge of 54.9 e- +/- 11.3 e- (rms) is measured without connecting the ASIC to any detectors. From the spectroscopy measurements using a CdTe single-sided strip detector, the energy resolution of 1.12 keV (FWHM) is obtained at 13.9 keV, and photons within the energy from 6.4 keV to 122.1 keV are detected. Based on the experimental results, we propose a new low-noise readout architecture making use of a slew-rate limited mode at the shaper followed by a peak detector circuit.
description: 6 pages, 10 figures, accepted for publication in Nuclear Inst. and Methods in Physics Research, A
Accurate sampling using Langevin dynamics
Creators: name: Bussi, Giovanni
name: Parrinello, Michele
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show how to derive a simple integrator for the Langevin equation and illustrate how it is possible to check the accuracy of the obtained distribution on the fly, using the concept of effective energy introduced in a recent paper [J. Chem. Phys. 126, 014101 (2007)]. Our integrator leads to correct sampling also in the difficult high-friction limit. We also show how these ideas can be applied in practical simulations, using a Lennard-Jones crystal as a paradigmatic case.
Harmonic polynomials for expanding the fluctuations of the Cosmic Microwave Background: The Poincare and the 3-sphere model
Creators: name: Kramer, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Fluctuations of the Cosmic Microwave Background CMB are observed by the WMAP. When expanded into the harmonic eigenmodes of the space part of a cosmological model, they provide insight into the large-scale topology of space. All harmonic polynomials on the multiply connected dodecahedral Poincare space are constructed. Strong and specific selection rules are given by comparing the polynomials to those on the 3-sphere, its simply connected cover.
description: 12 pages
Σύγκριση των παραδοσιακών τρόπων κρατήσεων, των Travel 2.0 τεχνολογιών & των on-line συστημάτων κρατήσεων:
Creators: name: Τοπχαρά, Γαλήνη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: subject: Κρατήσεις
subject: Τουρισμός
subject: Τεχνολογίες Πληροφορικής και Επικοινωνιών
subject: Reservations
subject: Tourism
subject: FOS: Economics and business
subject: Information and Communication Technologies

description: Ο τουρισμός αποτελεί έναν από τους σημαντικότερους τομείς στην οικονομία κάθε χώρας της υφηλίου καθώς συνδράμει σε μεγάλο βαθμό στην αύξηση των εσόδων και στη βελτίωση του βιοτικού επιπέδου. Τα ξενοδοχειακά καταλύματα σήμερα αναζητούν ολοένα και περισσότερο αποτελεσματικότερους τρόπους πραγματοποίησης κρατήσεων. Διανύοντας την εποχή της Πληροφορίας, έχουν έρθει στο προσκήνιο νέοι τρόποι κρατήσεων, οι οποίοι δεν χρησιμοποιούνταν στο παρελθόν και σε συνδυασμό με την εξοικείωση των καταναλωτών με τις νέες τεχνολογίες, γίνονται όλο και δημοφιλέστεροι. Η παρούσα Διπλωματική Εργασία έχει ως στόχο της, λοιπόν, τη σύγκριση τριών μεθόδων κρατήσεων, δηλ. αυτών που γίνονται μέσω των παραδοσιακών τουριστικών πρακτορείων, των Travel 2.0 τεχνολογιών και των on-line συστημάτων κρατήσεων.
description: Tourism is one of the most important sectors for the economy of each country of the world due to the fact that it assists greatly in increasing revenues and improving living standards. The hotel units are constantly looking for effective ways to make reservations. Nowadays, going through the information age, new ways of reservations, which are not used in the past and in conjunction with consumer awareness with new technologies, are becoming increasingly popular. This thesis aims to compare three methods of reservations, particularly those made through traditional travel agencies, the Travel 2.0 technologies and on-line booking.
Bayesian analysis of Friedmannless cosmologies
Creators: name: Elgaroy, Oystein
name: Multamaki, Tuomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Assuming only a homogeneous and isotropic universe and using both the 'Gold' Supernova Type Ia sample of Riess et al. and the results from the Supernova Legacy Survey, we calculate the Bayesian evidence of a range of different parameterizations of the deceleration parameter. We consider both spatially flat and curved models. Our results show that although there is strong evidence in the data for an accelerating universe, there is little evidence that the deceleration parameter varies with redshift.
description: 7 pages, 3 figures
1.15_Sommerfeld: Mesoscale model based techniques for LiDAR wind speed measurement gap-filling
Creators: name: , Sommerfeld
name: Haghi
Publisher: name: Zenodo
Year: 2019
Subjects: LiDAR, WRF, wind speed gap filling, mesoscale modeling

description: Wind LiDAR (Light Detection and Ranging) measurements have improved greatly in range and precision over the last years. However, data availability is physically limited by aerosol content, affected by weather and cloud cover. Since most aerosols originate from the surface, data availability generally decreases with altitude, reducing the accuracy and reliability of resource assessments. As turbines become taller, and in particular for airborne wind energy (AWE) technologies, data aloft beyond 300-400m is becoming increasingly important, and paradoxically the region in which in which LiDAR data availability becomes challenging.This study investigates the potential of filling LiDAR data gaps with simulated mesoscale model results,specifically WRF (Weather Research and Forecasting model) results. The goal is to improve wind speed time series and statistics, as well as increase resource assessment reliability. The LiDAR data used in this study are part of a six month onshore measuring campaign in Northern Germany, with wind speeds and directions up to 1100m recorded. The WRF model itself was enhanced by using the LiDAR data for observational nudging in the WRF solver. The predictive capabilities of an un-nudged baseline runs will be presented.A direct insertion of WRF output into the LiDAR data gaps is possible, but since temporal and spatial resolution differ between measurement and model sub-optimal results would be obtained. Instead, we will compare results from various extrapolation and interpolation algorithms and quantify the differences compared to measurements. As a first approach, we use the average diurnal difference between measured and modeled wind speed to bring the simulation results closer to measurements. The figure shows LiDAR measurements (1st row), WRF simulation (2nd row), the difference after applying the diurnal adjustment (3rdrow) and LiDAR data with gaps filled with the adjusted WRF output (4th row). Ongoing research is aiming to define a discrepancy function between the measurement and simulations; by implementing Kriging on the discrepancy function at the available data points, we can fill the gaps in the data to an acceptable confidence level. We are going to test implementation by creating artificial gaps in the measurement data and predicting them with the trained Kriging algorithm for validation. Final results will be presented in the final paper and presentation.
Οι κομήτες στην αριστοτελική κοσμολογία:
Creators: name: Τραϊανού, Απόστολος Θεοδώρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Αριστοτέλης
Μετεωρολογικά
Κομήτες
Aristotle
Meteorologica
Comets

description: Αντικείμενο της παρούσας εργασίας αποτελεί η πραγμάτευση του φαινομένου των κομητών από τον Αριστοτέλη στα κεφάλαια Α 6-7 των Μετεωρολογικών, όπου εκθέτει και ελέγχει ορισμένες ιδέες των προκατόχων του και, κατόπιν, αναπτύσσει την δική του. Το πρώτο κεφάλαιο της εργασίας συμπεριλαμβάνει μία περιγραφή των βασικών χαρακτηριστικών του αριστοτελικού κόσμου. Στο δεύτερο κεφάλαιο παρουσιάζονται λεπτομερώς οι προγενέστερες απόψεις. Αυτές χαρακτηρίζονται από σημαντικές αδυναμίες, εμφανείς ήδη από την εποχή του φιλοσόφου, ο οποίος ασκεί εναντίον τους μία κριτική αντικειμενική και αποτελεσματική. Τα επιχειρήματά του αναλύονται ένα προς ένα στο τρίτο κεφάλαιο, όπου παρατίθεται και μία συνολική εκτίμηση της κριτικής του. Στη συνέχεια εξετάζεται η θεωρία του ιδίου και τα χαρακτηριστικά της. Παρότι η σύλληψη του για τον κόσμο τον οδήγησε, σε αντίθεση με τους προδρόμους του, να θεωρήσει τους κομήτες όχι αστρονομικό, αλλά μετεωρολογικό φαινόμενο, η εξήγησή του είναι πολύ πειστικότερη. Αυτή η τελευταία διαφορά συνιστά ένα σημαντικό στοιχείο. Ερευνώντας τα αίτιά της, συμπεραίνουμε ότι οφείλεται στην εμφατική διαφορά κυρίως ως προς τα διαθέσιμα παρατηρησιακά δεδομένα, αλλά επίσης και ως προς τις γνώσεις για τον ουρανό και ειδικά για τους πλανήτες, στοιχεία που συνέβαλαν καθοριστικά στην εξέλιξη της σχετικής μελέτης μεταξύ των μέσων-τελών του 5ου και των μέσων του 4ου αιώνα.
description: The subject of this essay is Aristotle’s attempt to explain the phenomenon of comets in Meteorologica A 6-7, where he presents and criticizes some ideas of his predecessors before developing his own. The first chapter describes the fundamental characteristics of the Aristotelian world. The second chapter presents the views of Aristotle's predecessors on the nature of comets. They have serious problems which were evident already in Aristotle's time as his effective criticism shows. His arguments are analyzed individually in the third chapter, where an overall evaluation of his criticism is also given. Subsequently, his own theory and its characteristics are examined. Although his conception of the world led him to consider comets a meteorological, not astronomical phenomenon in contrast with his predecessors, his explanation is much more convincing. This can be attributed to the relative wealth of observational data at his disposal, which helped the study of comets to advance considerably between the mid-fifth and mid-fourth centuries BC.
Shapley Optical Survey II: The effect of environment on the colour-magnitude relation and galaxy colours
Creators: name: Haines, C. P.
name: Merluzzi, P.
name: Mercurio, A.
name: Gargiulo, A.
name: Krusanova, N.
name: Busarello, G.
name: La Barbera, F.
name: Capaccioli, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an analysis of the effects of environment on the photometric properties of galaxies in the core of the Shapley Supercluster at z=0.05, one of the most massive structures in the local universe. The Shapley Optical Survey (SOS) comprises archive WFI optical imaging of a 2.0 deg^2 region containing the rich clusters A3556, A3558 and A3562 which demonstrate a highly complex dynamical situation including ongoing cluster mergers. The B-R/R colour-magnitude relation has an intrinsic dispersion of 0.045 mag and is 0.015\pm0.005 mag redder in the highest-density regions, indicative of the red sequence galaxy population being 500 Myr older in the cluster cores than towards the virial radius. The B-R colours of galaxies are dependent on their environment, whereas their luminosities are independent of the local density, except for the very brightest galaxies (M_RM*+2) galaxies change from the cluster cores where ~90% of galaxies lie along the cluster red sequence to the virial radius, where the fraction has dropped to just ~20%. This suggests that processes related to the supercluster environment are responsible for transforming faint galaxies, rather than galaxy merging, which should be infrequent in any of the regions studied here. The largest concentrations of faint blue galaxies are found between the clusters, coincident with regions containing high fractions of ~L* galaxies with radio emission indicating starbursts. Their location suggests star-formation triggered by cluster mergers, in particular the merger of A3562 and the poor cluster SC1329-313, although they may also represent recent arrivals in the supercluster core complex. (abstract truncated)
description: 13 pages, 8 figures, accepted for publication in MNRAS
Degree Estimates for Polynomials Constant on a Hyperplane
Creators: name: D'Angelo, John P.
name: Lebl, Jiri
name: Peters, Han
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32H02, 32H35, 14P05

description: The study of proper rational mappings between balls in complex Euclidean spaces naturally leads to the relationship between the degree and imbedding dimension of such a mapping. The special case for monomial mappings is equivalent to the question discussed in this paper. Estimate the degree $d$ of a polynomial in $n$ real variables, assumed to have non-negative coefficients and to be constant on a hyperplane, in terms of the number $N$ of its terms. No such estimate is possible when $n=1$. The sharp bound $d\le 2N-3$ is known when $n=2$. This paper includes two main results. The first provides a bound, not sharp for $n\ge 3$, for all $n\ge 2$. This bound implies the more easily stated bound $d\le {4(2N-3)\over 3(2n-3)}$ for $n\ge 3$. The second result is a stabilization theorem; if $n$ is sufficiently large given $d$, then the sharp bound $d \le {N-1 \over n-1}$ holds. In this situation we determine all polynomials for which the bound is sharp.
description: 20 pages, minor corrections, accepted to Michigan Math. J
LodoNet: A Deep Neural Network with 2D Keypoint Matchingfor 3D LiDAR Odometry Estimation
Creators: name: Zheng, Ce
name: Lyu, Yecheng
name: Li, Ming
name: Zhang, Ziming
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.5.4

description: Deep learning based LiDAR odometry (LO) estimation attracts increasing research interests in the field of autonomous driving and robotics. Existing works feed consecutive LiDAR frames into neural networks as point clouds and match pairs in the learned feature space. In contrast, motivated by the success of image based feature extractors, we propose to transfer the LiDAR frames to image space and reformulate the problem as image feature extraction. With the help of scale-invariant feature transform (SIFT) for feature extraction, we are able to generate matched keypoint pairs (MKPs) that can be precisely returned to the 3D space. A convolutional neural network pipeline is designed for LiDAR odometry estimation by extracted MKPs. The proposed scheme, namely LodoNet, is then evaluated in the KITTI odometry estimation benchmark, achieving on par with or even better results than the state-of-the-art.
description: In 28th ACM International Conference on Multimedia, 9 pages
Μελέτη, αποτύπωση και εξερεύνηση των διαφοροποιητικών χαρακτηριστικών των ομάδων αυτοβοήθειας στο πεδίο των εξαρτήσεων.
Creators: name: Χουλιάρας, Ηλίας Κωνσταντίνου
name: Δημητριάδου, Βαλεντίνα Ελευθερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ομάδες Αυτοβοήθειας
Εξαρτήσεις
Σύγκριση Ομάδων Αυτοβοήθειας
Self-help groups
Addiction
Comparison of Self-help groups

description: Η παρούσα μελέτη στοχεύει σε μια συστηματική καταγραφή των χαρακτηριστικών αλλά και των διαφορών που αφορούν τη φιλοσοφία, τη δομή και τη λειτουργία 12 ομάδων αυτοβοήθειας που σχετίζονται με την χρήση ουσιών. Το προς ανάλυση υλικό συγκεντρώθηκε από τις επίσημες ιστοσελίδες των ομάδων, ενώ για τη διαμόρφωση του κατηγοριοποιητικού-αναλυτικού σχήματος χρησιμοποιήθηκαν οι αρχές της ποιοτικής ανάλυσης περιεχομένου και της Θεμελιωμένης Θεωρίας. Το τελικό αναλυτικό σχήμα αποτέλεσαν 12 βασικοί άξονες οι οποίοι αφορούσαν τον ορισμό και την αντιμετώπιση τα εξάρτησης, τους επιμέρους στόχους και μέσα της απεξάρτησης, την εμπλοκή ειδικών και τη σχέση με φορείς χρηματοδότησης. Τα αποτελέσματα αναδεικνύουν: α) τη χαλαρή σύνδεση του άξονα του ορισμού της εξάρτησης με την αντιμετώπισή της, καθώς συχνά προκύπτουν αντιφάσεις μεταξύ του κατά βάση βιολογικού ορισμού της εξάρτησης με μια κυρίως μη βιολογική αντιμετώπισή της, β) το «ψυχολογικοποιημένο» μοντέλο πρότασης ανάρρωσης που αποτελεί αποτέλεσμα συνδυασμού διαφορετικών χαρακτηριστικών της δομής και της λειτουργίας των ομάδων, γ) τις αυξημένες ευθύνες εξωτερικών πηγών παρέμβασης σε βάρος της αυτοδυναμίας επιμέρους ομάδων. Η συζήτηση των ευρημάτων συνδυάζεται με προτάσεις για παραπέρα διερεύνηση του ανεξερεύνητου πεδίου των Κινημάτων αυτοβοήθειας.
description: The present study aims at a systematic mapping of the characteristics and differences related to the philosophy, the structure and the function of 12 self-help groups related to substance use. The material to be analyzed was collected from the official studies of the groups, while for the shaping of the classification-analysis scheme were used the principles of qualitative content analysis and grounded theory as well. The final analytical scheme is constituted by 12 main axes which refer to the definition and treatment of addiction, the individual goals and means of recovery, the professional involvement and the affiliations with funding resources. The results reveal: i) the loose correlation between the axes of definition of addiction and its treatment, as the contradiction between mainly biological definition of addiction with a basically non biological treatment was found to be a usual phenomenon, ii) the “psycologicized” model of the recovery proposals which is a result of the combination of different structural and functional characteristics of the groups, iii) the increased responsibilities of external interference sources at the expense of individual groups’ autonomy. The discussion of the findings is combined with proposals for further research on the unexplored area of the self-help movements.
Assessing the generalizability of the BEM Sex Role Inventory (BSRI) : a replication of the BSRI’s item selection procecudures
Creators: name: De Vita, Elsie Lorna
Publisher: name: University of British Columbia
Year: 2009

description: Since its construction over 20 years ago, the Bern Sex Role Inventory (BSRI; Bern, 1974) has been used extensively in various types of research. The intent of the current study was to replicate Bern's item selection procedures for the BSRI to assess the current generalizability of the measure to students at a university in British Columbia in Canada. Two hundred and ten students (81 males and 129 females) enrolled in introductory anthropology and sociology courses were asked to rate the original 400 adjectives used to construct the BSRI on the basis of cultural definitions of gender-typed appropriateness. The results were as follows: first, 62 of the 73 sex-typed items that Bern (1974) found significantly more desirable for one gender than the other replicated in the current study; second, 88 additional items were rated as significantly more desirable forone gender than the other by both male and female U.B.C. judges; third, there were significant differences in the mean ratings on the 60 BSRI items by Bern's Stanford judges and the U.B.C. judges; and finally, the Asian judges in the current study rated fewer of the 60 BSRI items as significantly more desirable for one gender than the other than did the White judges.
GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4. II.The eBCS clusters and analysis of the complete sample
Creators: name: Venturi, T.
name: Giacintucci, S.
name: Dallacasa, D.
name: Cassano, R.
name: Brunetti, G.
name: Bardelli, S.
name: Setti, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the GMRT cluster radio halo survey. The main purposes of our observational project are to measure which fraction of massive galaxy clusters in the redshift range z=0.2--0.4 hosts a radio halo, and to constrain the expectations of the particle re--acceleration model for the origin of the non--thermal radio emission. We selected a complete sample of 50 clusters in the X-ray band from the REFLEX (27) and the eBCS (23) catalogues. In this paper we present Giant Metrewave Radio Telescope (GMRT) observations at 610 MHz for all clusters still lacking high sensitivity radio information, i.e. 16 eBCS and 7 REFLEX clusters, thus completing the radio information for the whole sample. The typical sensitivity in our images is in the range 1$σ\sim 35-100 μ$Jy b$^{-1}$. We found a radio halo in A697, a diffuse peripheral source of unclear nature in A781, a core--halo source in Z7160, a candidate radio halo in A1682 and ``suspect'' central emission in Z2661. Including the literature information, a total of 10 clusters in the sample host a radio halo. A very important result of our work is that 25 out of the 34 clusters observed with the GMRT do not host extended central emission at the sensitivity level of our observations, and for 20 of them firm upper limits to the radio power of a giant radio halo were derived. The GMRT Radio Halo Survey shows that radio halos are not common, and our findings on the fraction of giant radio halos in massive clusters are consistent with the statistical expectations based on the re--acceleration model. Our results favour primary to secondary electron models.
description: A&A in press, 17 pages, 12 figures, 4 tables Version with high quality figures available on web at http://www.ira.inaf.it/~tventuri/pap/Venturi_web.pdf
Τα λαϊκά παραμύθια: τρίγλωσση εφαρμογή(γαλλικά, γερμανικά, ελληνικά). Απόψεις παιδαγωγών προσχολικής ηλικίας
Creators: name: Καραγιάννη, Βασιλική Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Λαϊκά παραμύθια
Προσχολική ηλικία
Τρίγλωσση εφαρμογή
Folktales
Childhood
Trilingual application

description: Η σπουδαιότητα των παραμυθιών και ο πανανθρώπινος χαρακτήρας τους μας έδωσαν την ιδέα να ασχοληθούμε με αυτό το θέμα. Έτσι, ο σκοπός αυτής της εργασίας ήταν να δούμε και να εξετάσουμε, εάν τα παραμύθια θα μπορούσαν να αποτελέσουν ένα μέσο γνωριμίας με άλλες κουλτούρες και άλλους πολιτισμούς, καθώς επίσης και με άλλα ήθη-έθιμα ή πολιτισμικές ιδιαιτερότητες μέσα από τα στοιχεία που προβάλλονται σε αυτά και μέσα από τα μηνύματα που περνούν. Στην ελληνική λογοτεχνία πράγμα το οποίο ισχύει και για την κάθε τοπική λογοτεχνία, προβάλλονται οι πολιτισμικές ιδιαιτερότητες. Η γνωριμία με το πολιτισμικά διαφορετικό αποτελεί το καλύτερο μέσο σύγκλισης ανάμεσα σε κουλτούρες διαφορετικές. Ένας τρόπος για αυτή τη γνωριμία είναι και το παραμύθι. Έτσι θέσαμε ως σκοπό της έρευνας, να εξετάσουμε τις ομοιότητες και της διαφορές που έχει το ίδιο παραμύθι από χώρα σε χώρα( Ελλάδα, Γαλλία, Γερμανία) και να δούμε σε ποιούς τομείς διαφέρουν και σε ποιούς τομείς εμφανίζουν ομοιότητες. Στη συνέχεια αυτής της εργασίας ,θελήσαμε να δούμε και να εξετάσουμε, εάν το παραμύθι στις μέρες μας χρησιμοποιείται στην εκπαιδευτική διαδικασία από τους παιδαγωγούς προσχολικής ηλικίας στο σχολικό περιβάλλον και συγκεκριμένα στους δημόσιους παιδικούς σταθμούς όπου φιλοξενούνται παιδιά ηλικίας 2,5 έως πέντε ετών.
description: The importance of fairy tales and their universal character gave us the idea to deal with this issue. Thus, the aim of this study was to look and look, if the stories could be a means to get to know other cultures and other cultures, as well as other manners-customs or cultural differences through the data displayed on these and through messages passed. In Greek literature , which applies to any local literature, highlighted the cultural differences. The acquaintance with different cultures is the best way convergence between different cultures. One way to meet this is the tale. So we set an objective of the research, look at the similarities and differences of the same tale from country to country (Greece, France, Germany ) and see in which areas differ and in which areas show similarities. Then this work, we wanted to see and look, if the tale nowadays used in the educational process of their preschool teachers in the school environment and in particular to public kindergartens which hosts children 2.5 to five years.
description: Συνεργαζόμενα Τμήματα Πανεπιστήμιο Λε Μαν (Maine France, Γαλλία)
Protostellar outflow-driven turbulence
Creators: name: Matzner, Christopher D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Protostellar outflows crisscross the regions of star cluster formation, stirring turbulence and altering the evolution of the forming cluster. We model the stirring of turbulent motions by protostellar outflows, building on an observation that the scaling law of supersonic turbulence implies a momentum cascade analogous to the energy cascade in Kolmogorov turbulence. We then generalize this model to account for a diversity of outflow strengths, and for outflow collimation, both of which enhance turbulence. For a single value of its coupling coefficient the model is consistent with turbulence simulations by Li & Nakamura and, plausibly, with observations of the NGC 1333 cluster-forming region. Outflow-driven turbulence is strong enough to stall collapse in cluster-forming regions for several crossing times, relieving the mismatch between star formation and turbulent decay rates. The predicted line-width-size scaling implies radial density indices between -1 and -2 for regions supported by outflow-driven turbulence, with a tendency for steeper profiles in regions that are more massive or have higher column densities.
description: 15 pages, 3 figures, submitted to ApJ
The experience of mothering preschool children for women who were sexually abused in childhood
Creators: name: Loewen, Hazel Marie
Publisher: name: University of British Columbia
Year: 2009

description: The present study explored the experience of mothering preschool children for women who have histories of childhood sexual abuse. Previous research in this topic area has identified many long term negative effects of sexual abuse (Browne & Finkelhor, 1986; Courtois, 1988). In particular, the negative effects on the sruvivors' relationships have been noted (Briere, 1989; Gelinas, 1983). However, research in the area of the adult survivors relationships with their children is limited and in some cases is flawed by a mother-blaming bias (Burkett, 1991). By focussing on the mother's subjective point of view, the current research attempted to describe this phenomenon and understand it more fully. An existential phenomenological research method was employed in order to attain these goals. Seven participants volunteered to take part in this research and were asked to describe their experiences while mothering their preschool children. These unstructured interviews were audio-taped, transcribed and analyzed for common themes. Mothering, for these participants, was revealed to be a complex, intense and transformative experience. The following themes were found to be present in these mothers' experiences: 1) the experience of being overwhelmed, 2) the experience of fearing for their children's safety, 3) the experience of self-doubt and uncertainty, 4) the experience of needing to withdraw, 5) a sense of needing to break with the past, 6) a sense of evolving as a mother, and, 7) a sense of child a catalyst in healing. The results of this research have several implications for future research and counselling. In particular, the healing potential of the mother-child relationship for women who were sexually abused as children is suggested by these findings.
Toroidal Orbifolds a la Vafa-Witten
Creators: name: Dillies, Jimmy
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14J10

description: We classify orbifolds obtained by taking the quotient of a three tori by abelian extensions of Z/n x Z/n automorphisms, where each torus has a multiplicative Z/n action (n=3,4 or 6). This 'completes' the classification of orbifolds of the above type initiated by Donagi and Faraggi (hep-th/0403272) and, Donagi and Wendland in the cases n=2.
description: 24 pages, 2 figures
Cosmology with the Einstein Telescope: No Slip Gravity Model and Redshift Specifications
Creators: name: Mitra, Ayan
name: Mifsud, Jurgen
name: Mota, David F.
name: Parkinson, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Einstein Telescope and other third generation interferometric detectors of gravitational waves are projected to be operational post $2030$. The cosmological signatures of gravitational waves would undoubtedly shed light on any departure from the current gravitational framework. We here confront a specific modified gravity model, the No Slip Gravity model, with forecast observations of gravitational waves. We compare the predicted constraints on the dark energy equation of state parameters $w_0^{}-w_a^{}$, between the modified gravity model and that of Einstein gravity. We show that the No Slip Gravity model mimics closely the constraints from the standard gravitational theory, and that the cosmological constraints are very similar. The use of spectroscopic redshifts, especially in the low--redshift regime, lead to significant improvements in the inferred parameter constraints. We test how well such a prospective gravitational wave dataset would function at testing such models, and find that there are significant degeneracies between the modified gravity model parameters, and the cosmological parameters that determine the distance, due to the gravitational wave dimming effect of the modified theory.
description: 15 pages, 11 figures
Οι συναντήσεις του Οικουμενικού Πατριάρχη Δημητρίου Α' (1972-1991) με εκκλησιαστικούς ηγέτες στο Φανάρι και οι επισκέψεις του στο εξωτερικό:
Creators: name: Καράς, Κωνσταντίνος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Δημήτριος Α'
Οικουμενικός Πατριάρχης
Επισκέψεις
Dimitrios A'
Ecumenical Patriarch
Visits

description: Στην παρούσα εργασία , ως μεταπτυχιακή διατριβή, παρουσιάζονται οι συναντήσεις της Α.Θ.Π Δημητρίου Α’ με εκκλησιαστικούς ταγούς στο Φανάρι καθώς και οι επίσκεψεις του ίδιου στο εξωτερικό, κατά την 19ετη παραμονή στην πρωτόθρονη Εκκλησία της Κωνσταντινούπολης. Με γνώμονα τις κρατούσες συνθήκες κατά περίσταση , τόσο εκκλησιαστικώς αλλα κυρίως κοινωνικοπολιτικώς , αποτυπώνονται οι επαφές του Οικουμενικού Πατριάρχη Δημητρίου Α΄ με κείμενα και φωτογραφικά στιγμιότυπα από μια πλούσια δραστηριότητα , μια πορεία αγάπης στον κόσμο , σε μια εποχή όπου η παγκόσμια κοινότητα βίωσε εκπλητικές αλλαγές.
description: It’s cause of this current postgraduate thesis, is the presentation of the Ecumenical Patriarch Dimitrios A’ contact’s with church leaders in Fanar and his visits in the world, during the nineteen period of his patriarch. Under particular circumstances that exists in every unique case, political and ecclesiastical, those contacts and visits it΄s been demonstrated with texts and photos, from a rich activity, a love course in a period that world has been experienced tremendous changes.
Contribution of spin 1/2 and 3/2 resonances to two-photon exchange effects in elastic electron-proton scattering
Creators: name: Kondratyuk, S.
name: Blunden, P. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate contributions of hadron resonances to two-photon exchange effects in electron-proton scattering. In addition to the nucleon and P33 resonance, the following heavier resonances are included as intermediate states in the two-photon exchange diagrams: D13, D33, P11, S11 and S31. We show that the corrections due to the heavier resonances are smaller that the dominant nucleon and P33 contributions. We also find that there is a partial cancellation between the contributions from the spin 1/2 and spin 3/2 resonances, which results in a further suppression of their aggregate two-photon exchange effect.
description: 6 pages, 1 figure; additional comparison with data, results unchanged; to be published in Phys. Rev. C
The Near-Sun Streamer Belt Solar Wind: Turbulence and Solar Wind Acceleration
Creators: name: Chen, C. H. K.
name: Chandran, B. D. G.
name: Woodham, L. D.
name: Jones-Mecholsky, S. I.
name: Perez, J. C.
name: Bourouaine, S.
name: Bowen, T. A.
name: Klein, K. G.
name: Moncuquet, M.
name: Kasper, J. C.
name: Bale, S. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The fourth orbit of Parker Solar Probe (PSP) reached heliocentric distances down to 27.9 Rs, allowing solar wind turbulence and acceleration mechanisms to be studied in situ closer to the Sun than previously possible. The turbulence properties were found to be significantly different in the inbound and outbound portions of PSP's fourth solar encounter, likely due to the proximity to the heliospheric current sheet (HCS) in the outbound period. Near the HCS, in the streamer belt wind, the turbulence was found to have lower amplitudes, higher magnetic compressibility, a steeper magnetic field spectrum (with spectral index close to -5/3 rather than -3/2), a lower Alfvénicity, and a "1/f" break at much lower frequencies. These are also features of slow wind at 1 au, suggesting the near-Sun streamer belt wind to be the prototypical slow solar wind. The transition in properties occurs at a predicted angular distance of ~4° from the HCS, suggesting ~8° as the full-width of the streamer belt wind at these distances. While the majority of the Alfvénic turbulence energy fluxes measured by PSP are consistent with those required for reflection-driven turbulence models of solar wind acceleration, the fluxes in the streamer belt are significantly lower than the model predictions, suggesting that additional mechanisms are necessary to explain the acceleration of the streamer belt solar wind.
Cosmology as a search for overall equilibrium
Creators: name: Barcelo, Carlos
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this letter we will revise the steps followed by A. Einstein when he first wrote on cosmology from the point of view of the general theory of relativity. We will argue that his insightful line of thought leading to the introduction of the cosmological constant in the equations of motion has only one weakness: The constancy of the cosmological term, or what is the same, its independence of the matter content of the universe. Eliminating this feature, I will propose what I see as a simple and reasonable modification of the cosmological equations of motion. The solutions of the new cosmological equations give place to a cosmological model that tries to approach the Einstein static solution. This model shows very appealing features in terms of fitting current observations.
description: 9 pages, 1 figure