cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multiplicity Dependence of Partially Coherent Pion Production in Relativistic Heavy Ion Collisions
Creators: name: Morita, Kenji
name: Muroya, Shin
name: Nakamura, Hiroki
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We investigate two- and three-particle intensity correlation functions of pions in relativistic heavy ion collisions for different colliding energies. Based on three models of particle production, we analyze the degree to which the pion sources are chaotic in the SPS S+Pb, Pb+Pb and the RHIC Au+Au collisions. The ``chaoticity'', $λ$, of the two-particle correlation functions is corrected for long-lived resonance decays. The effect of the partial Coulomb correction is also examined. Although the partially coherent model gives a result which is consistent with that of STAR, the chaotic fraction does not exhibit clear multiplicity dependence if we take into account both the corrected chaoticity and the weight factor of the three-pion correlation function. The result of the partially-multicoherent model indicates an increasing number of coherent sources in higher multiplicity events.
description: revised version to be published in Prog.Theor.Phys., 19 pages, 8 figures
A new instability domain of CNO-flashing low-mass He-core stars on their early white-dwarf cooling branches
Creators: name: Calcaferro, Leila M.
name: Córsico, Alejandro H.
name: Althaus, Leandro G.
name: Bell, Keaton J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Before reaching their quiescent terminal white-dwarf cooling branch, some low-mass helium-core white dwarf stellar models experience a number of nuclear flashes which greatly reduce their hydrogen envelopes. Just before the occurrence of each flash, stable hydrogen burning may be able to drive global pulsations that could be relevant to shed some light on the internal structure of these stars through asteroseismology. We present a pulsational stability analysis applied to low-mass helium-core stars on their early white-dwarf cooling branches going through CNO flashes in order to study the possibility that the $\varepsilon$ mechanism is able to excite gravity-mode pulsations. We carried out a nonadiabatic pulsation analysis for low-mass helium-core white-dwarf models going through CNO flashes during their early cooling phases. We found that the $\varepsilon$ mechanism due to stable hydrogen burning can excite low-order ($\ell= 1, 2$) gravity modes with periods between $\sim 80$ and $500\ $s, for stars with $0.2025 \lesssim M_{\star}/M_{\odot} \lesssim 0.3630$ located in an extended region of the $\log g - T_{\rm eff}$ diagram with effective temperature and surface gravity in the ranges $15\,000 \lesssim T_{\rm eff} \lesssim 38\,000\ $K and $5.8 \lesssim \log g \lesssim 7.1$, respectively. Since the timescales required for these modes to reach amplitudes large enough to be observable are shorter than their corresponding evolutionary timescales, the detection of pulsations in these stars is feasible. If a low-mass white dwarf star were found to pulsate with low-order gravity modes in this region of instability, it would confirm our result that such pulsations can be driven by the $\varepsilon$ mechanism. In addition, confirming a rapid rate of period change in these pulsations would support that these stars actually experience CNO flashes, as predicted by evolutionary calculations.
description: 9 pages, 6 figures, 1 table. To be published in Astronomy and Astrophysics
Δημόσιοι υπόλογοι με έμφαση στον καταλογισμό του ελλείμματος:
Creators: name: Κολτσίδα, Γιαννούλα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Δημόσιοι υπόλογοι
Καταλογισμός
Ελλειμμα
Public accounting officers
Imputation
Deficit

description: Η διπλωματική εργασία πραγματεύεται το θέμα των δημοσίων υπολόγων με έμφαση στον καταλογισμό τους σε περίπτωση διαπίστωσης ελλείμματος. Αρχικά παρουσιάζεται συνοπτικά η συνταγματική κατοχύρωση του Ελεγκτικού Συνεδρίου, οι ελεγκτικές, γνωμοδοτικές και δικαστικές του αρμοδιότητες και η φύση του, για την οποία έχουν διατυπωθεί διάφορες απόψεις. Η συζήτηση για τη δικαστική ή μη φύση του Ελεγκτικού Συνεδρίου, δεν περιορίζεται σε μία νομική και μόνο σημασία, αλλά έχει, στην ουσία του, πρακτική σημασία. Το ελληνικό σύστημα δημοσιονομικού ελέγχου δομείται σε μία βάση δικαστικής οργάνωσης του ελέγχου, και ως εκ τούτου ανατέθηκε σε ένα ανώτατο δικαστήριο συντιθέμενο από δικαστικούς λειτουργούς. Ακολουθεί μία εξαιρετικά σύντομη αναφορά στον προληπτικό έλεγχο, με σκοπό κυρίως την ομαλή μετάβαση στο δεύτερο και βασικό μέρος της διπλωματικής εργασίας, που αφορά στον κατασταλτικό έλεγχο και δη τους δημοσίους υπολόγους. Η θεμελιώδης έννοια του κατασταλτικού ελέγχου, οι δημόσιοι υπόλογοι, οι οποίοι μετέχουν στην εκτέλεση του προϋπολογισμού ως διαχειριστές του δημόσιου πλούτου, αναλύεται στο τρίτο κεφάλαιο και δίνεται ιδιαίτερη σημασία στην έννοια του de facto υπολόγου και του συνευθυνόμενου. Μάλιστα, αναλύεται διεξοδικά το ζήτημα της ευθύνης και του καταλογισμού των δημοσίων υπολόγων. Η αστική-δημοσιολογιστική ευθύνη του υπολόγου διακρίνεται από την πειθαρχική και την ποινική και, παράλληλα, παρουσιάζονται ειδικότερα θέματα που αφορούν στην έκδοση και στο περιεχόμενο της καταλογιστικής πράξης.
description: This thesis addresses the issue of public accounting officer, focusing on the imputation in case of deficit. Initially, a brief presentation of constitutional outlines the constitutional guarantee of the Court of Auditors, the audit, advisory and legal responsibilities and its nature, which has been a matter of dispute. The debate on the judicial or non-judicial nature of the Court, is not limited in a legal value only, but it also has, in its essence, practical significance. The Greek financial control system is structured on a base of legal organization of control, and therefore it was assigned to a supreme court composed by judges. A very brief reference to precautionary control follows, aiming at a smooth transition to the second and most critical part of the thesis, dedicated to the suppressive control and the public accounting officers in particular. The concept of a de facto accounting officer and the jointly liable is also mentioned. In fact, the issue of liability and allocation of public officers is thoroughly analyzed. The urban-fiscal responsibility of the public accounting officer is distinguished from the disciplinary and criminal, while more specific issues relating to the adoption and content of the tax demand are presented.
Η γονική συμμετοχή στην ενασχόληση νέων στο ποδόσφαιρο αναψυχής
Creators: name: Ιωαννίδης, Λάζαρος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Γονική συμμετοχή
Γονική επίδραση
Οργανωμένα σπορ
Αυτοεκτίμηση
Parental involvment
Parental influence
Organised sports
Self esteem

description: Σκοπός της παρούσας έρευνας ήταν να διερευνηθεί η επίδραση της γονικής συμμετοχής στην ενασχόληση έφηβων με το ποδόσφαιρο σε οργανωμένες Ακαδημίες ποδοσφαίρου. Ειδικότερα στόχος ήταν η βρεθεί η σχέση ανάμεσα στη γονική συμμετοχή, το βαθμό ικανοποίησης των παιδιών και το επίπεδο αυτοεκτίμησης τους. Το όργανο αξιολόγησης που χρησιμοποιήθηκε ήταν τροποποίηση του ερωτηματολογίου των Stephen Leff & Rick Hoyle (1995) το οποίο είχε κατασκευαστεί για να εξετάσει τις αντιλήψεις παιδιών σχετικά με τη γονική συμμετοχή στο τένις. Το ερωτηματολόγιο μεταφράστηκε και τροποποιήθηκε για να μπορεί να χρησιμοποιηθεί σε Ακαδημίες Ποδοσφαίρου. Το διαμορφωμένο όργανο αξιολόγησης περιλάμβανε 3 κλίμακες για α) την γονική υποστήριξη β)τη γονική πίεση γ) την ικανοποίηση. Επίσης περιλάμβανε ερωτήσεις για την ιεράρχηση σημαντικών περιοχών της ζωής των παιδιών, την κόπωση, την ικανότητα τους στο ποδόσφαιρο και την αυτοεκτίμηση τους. Επιπλέον ζητηθήκαν δημογραφικά στοιχεία των συμμετεχόντων ( 5 ερωτήσεις). Το ερωτηματολόγιο δόθηκε σε παιδιά ηλικίας 12-17 ετών τα οποία αθλούνταν σε Ακαδημίες ποδόσφαιρου του Ν. Θεσσαλονίκης. Συνελέχθησαν 226 ερωτηματολόγια. Tα αποτελέσματα της έρευνας έδειξαν ότι τα παιδιά αντιλαμβάνονταν τους γονείς τους ως πολύ υποστηρικτικούς και ελάχιστα πιεστικούς και ότι τα επίπεδα ικανοποίησης τους ήταν υψηλά. Επιπλέον, βρέθηκε ότι η γονική υποστήριξη σχετίζεται θετικά με την ικανοποίηση και την αυτοεκτίμηση των έφηβων ποδοσφαιριστών ενώ η γονική πίεση σχετίζεται αρνητικά.
description: The aim of this survey was to investigate the perceived parental involvement in youth athlete’s participation in soccer Academies. Specifically the aim was to indicate the relation between perceived parental involvement, satisfaction and self- esteem. For this purpose an instrument was designed. The new instrument was a modification of Leff S. & Hoyle R.(1995) questionnaire which had been constructed to examine the parental involvement in tennis Academies. The instrument consisted of the following scales 1) parental support 2) parental pressure and 3) satisfaction. It also involved questions about adolescents preferences, their abilities in soccer, their feelings of burnout associated with soccer participation and their self-esteem. Additionally, the instrument provided demographic data (five questions).The questionnaire was completed by 12-17 year old male soccer players. Two hundred twenty six (226) questionnaires have been collected. In examination of means scores the parents appeared to be very supportive and less oppressive and the amount of players satisfaction, high. Furthermore, the results revealed that parental support is positively correlated with satisfaction and self esteem, whereas parental pressure negatively correlated with satisfaction and self esteem.
Using the medical image processing package, ImageJ, for astronomy
Creators: name: West, Jennifer L.
name: Cameron, Ian D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: At the most fundamental level, all digital images are just large arrays of numbers that can easily be manipulated by computer software. Specialized digital imaging software packages often use routines common to many different applications and fields of study. The freely available, platform independent, image-processing package ImageJ has many such functions. We highlight ImageJ's capabilities by presenting methods of processing sequences of images to produce a star trail image and a single high quality planetary image.
description: 15 pages, 6 figures; Published in JRASC
Strain modulation of Si vacancy emission from SiC micro- and nanoparticles
Creators: name: Vásquez, G. C.
name: Bathen, M. E.
name: Galeckas, A.
name: Bazioti, C.
name: Johansen, K. M.
name: Maestre, D.
name: Cremades, A.
name: Prytz, Ø.
name: Moe, A. M.
name: Kuznetsov, A. Yu.
name: Vines, L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Single-photon emitting point defects in semiconductors have emerged as strong candidates for future quantum technology devices. In the present work, we exploit crystalline particles to investigate relevant defect localizations, emission shifting and waveguiding. Specifically, emission from 6H-SiC micro- and nanoparticles ranging from 100 nm to 5 $μ$m in size is collected using cathodoluminescence (CL), and we monitor signals attributed to the Si vacancy (V$_{\textrm{Si}}$) as a function of its location. Clear shifts in the emission wavelength are found for emitters localized in the particle center and at the edges. By comparing spatial CL maps with strain analysis carried out in transmission electron microscopy, we attribute the emission shifts to compressive strain of 2-3% along the particle a-direction. Thus, embedding V$_{\textrm{Si}}$ qubit defects within SiC nanoparticles offers an interesting and versatile opportunity to tune single-photon emission energies, while simultaneously ensuring ease of addressability via a self-assembled SiC nanoparticle matrix.
A C*-Algebraic Model for Locally Noncommutative Spacetimes
Creators: name: Heller, Jakob G.
name: Neumaier, Nikolai
name: Waldmann, Stefan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 46L65; 53D55; 81T75

description: Locally noncommutative spacetimes provide a refined notion of noncommutative spacetimes where the noncommutativity is present only for small distances. Here we discuss a non-perturbative approach based on Rieffel's strict deformation quantization. To this end, we extend the usual C*-algebraic results to a pro-C*-algebraic framework.
description: 13 pages, LaTeX 2e, no figures
From Sexualized Media Consumption to Salary Negotiation: The Relation Between Chronic Self-Objectification Processes and Women’s Negotiation Intentions
Creators: name: Guizzo, Francesca
name: Di Michele, Daniela
name: Cadinu, Mara
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Medicine
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Science Policy
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences

description: Despite the advancement in women’s conditions in the past fifty years, women are still the targets of forms of oppression that span from sexual objectification to gender economic inequality, which, among other factors, is linked to challenges that women may face with wage negotiation. Bridging these two research areas, in the present correlational study (N = 552), we took the female target perspective and investigated whether everyday sexualized media consumption may be indirectly linked with Italian women’s negotiation intentions in a working scenario (i.e. salary request, negotiation probability, salary raise negotiation). We hypothesized that this association would be mediated by internalization of mainstream beauty ideals, chronic self-objectification, and subsequent lower self-attribution of the fundamental social dimensions of competence, agency, and morality. Path analyses supported the indirect path model on all the negotiation behaviors via self-attribution of competence; a significant indirect path via self-attribution of morality was also found on women’s negotiation probability. Implications for gender economic inequality as well as possible interventions are discussed.
Quantum Fluctuations in the Inflationary Universe
Creators: name: Kim, Sang Pyo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The recent three-year WMAP data selects large-field models with certain power-law potentials and small-field models for all power-law potentials as consistent inflation models. We study the large-field and small-field inflation model with a quadratic and a quartic potential within the framework of quantum field theory in an expanding Friedmann-Robertson-Walker universe. We find that quantum fluctuations in the small-field model lead to a significant contribution to the effective potential and may have non-negligible effects on the slow-roll parameters predicted by classical theory.
description: RevTex, 10 pages, no figure; Invited talk at CosPA 2006, National Taiwan Univ., Taiwan, Nov. 15-17, 2006
Επαναχρησιμοποίηση κώδικα σε εφαρμογές ανάπτυξης αντικειμενοστρεφούς λογισμικού και ηλεκτρονικού εμπορίου:
Creators: name: Σάββα, Κυριακή Χριστάκη
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Λογισμικό ανοιχτού κώδικα
Πρότυπα σχεδίασης
Εμπειρική μελέτη
Open source software
Design patterns
Empirical study

description: Σήμερα, ο αριθμός των διαθέσιμων εφαρμογών ανοιχτού λογισμικού ολοένα και αυξάνεται με την πάροδο των ετών, δίνοντας στους προγραμματιστές μεγάλα περιθώρια επαναχρησιμοποίησης τμημάτων έτοιμου κώδικα. Παράλληλα, τα πρότυπα σχεδίασης, από τη δημοσίευσή τους, έχουν ευρέως κερδίσει το ενδιαφέρον της κοινότητας ανάπτυξης λογισμικού, συμβάλλοντας σημαντικά στην δημιουργία επαναχρησιμοποιήσιμου και ποιοτικού κώδικά. Σκοπός αυτής της εργασίας είναι να μελετήσει τον βαθμό στον οποίο χρησιμοποιούνται τα πρότυπα σχεδίασης στις εφαρμογές ανοικτού λογισμικού. Πιο συγκεκριμένα, η μελέτη αυτή καταγράφει τα εμπειρικά αποτελέσματα που προέκυψαν από το πλήθος και το είδος των προτύπων σχεδίασης που ανιχνεύτηκαν σε ένα σύνολο εβδομήντα (70) διαφορετικών εφαρμογών ανοικτού λογισμικού. Οι κατηγορίες εφαρμογών που πήραν μέρος στην έρευνα αφορούν εργαλεία ανάπτυξης αντικειμενοστρεφούς λογισμικού και ηλεκτρονικού εμπορίου. Τέλος, τα αποτελέσματα της μελέτης αποδεικνύουν ότι κάποια είδη προτύπων χρησιμοποιούνται συχνότερα σε σύγκριση με άλλα και πως το είδος της εφαρμογής, το μέγεθος του προγράμματος, η ζήτησή του από τους χρήστες, η διάρκεια λειτουργίας του και το πλήθος των ατόμων που πήραν μέρος στη δημιουργία του αποτελούν βασικούς παράγοντες που επηρεάζουν τη χρήση των προτύπων σχεδίασης στις εφαρμογές ανοικτού λογισμικού.
description: Nowadays, the number of the open source software projects that are available is rapidly increasing over the years, providing the developers with high opportunities of reusing segments of already used code. Furthermore, design patterns, since their publication, have widely attracted the interest of the software engineering community, having a crucial role in the creation of reusable and qualitative code. Aim of this paper is to investigate the extent to which design patterns are employed in open source software. More specifically, this study reports empirical results based on the number and type of design patterns retrieved from seventy (70) open source software projects of various characteristics. The project categories that have been considered are object-oriented development tools and e-commerce applications. Finally, the results of the study suggest that several patterns are more frequently used compared to others and that project category, program size, number of downloads, days of project activity and the number of developers are crucial factors that influence the use of design patterns in open source software project.
Fishery planning in Barbados: the implications of social strategies for coping with uncertainty
Creators: name: McConney, Patrick A.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis provides information relevant to fisheries in which there is a desire to establish fisherfolk organizations, but where individualistic social networks rather than social cohesion and community prevail. Such situations in small-scale fisheries are poorly documented, but may define limits to the feasibility of co-management. In the case researched, the government of Barbados is designing a fisheries management planning process, but there is insufficient information on the social and economic characteristics of the unmanaged, small-scale, commercial fishery for migratory pelagics to determine whether either a state-structured (bioeconomic) or a cooperative (co-management) approach is appropriate. As a contribution to solving this practical, interdisciplinary problem, this study examined: the fishery-related uncertainties perceived by fisherfolk and government officials in Barbados; the social strategies of atomism, personal networks and formal organizations that fisherfolk may use to cope with uncertainty; and, whether the most appropriate initial management planning approach is bioeconomic or co-management. Research was conducted in Barbados between November 1993 and September 1994 involving surveys, social network analysis, participant observation and the study of official documents. Uncertainties related to fish catch and price were perceived by the majority of fisherfolk to be the most problematic, and the analysis focused on the means of coping with these. Evidence of social atomism was weak. Social networks, which tended to be individualistically-oriented among fishers, boat owners and processors, but more cooperative among vendors, were prevalent. Attempts by the harvest sector to formally organize to obtain market power had failed, but efforts to use this strategy persist. The state was found deficient in fishery planning and management capability. Barriers to communication within the state, and between it and the industry were apparent. Due mainly to the prevalence of networks and the state’s deficiencies, the bioeconomic approach is judged to be inappropriate in this setting. Due mainly to the high level of individualistic competition, the repeated failure of harvest sector organizations, and barriers to communication, co-management is problematic but more likely to be successffil. An incremental, institution-building approach to co-management is proposed due both to the flexibility of this approach and to the current political and planning environment that favours participative initiatives.
Measurements of heavy-flavor jets with ALICE at the LHC
Creators: name: Sheikh, Ashik Ikbal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Heavy quarks created in ultra-relativistic heavy-ion collisions are mostly produced in hard QCD processes during the early stages of the reaction. They interact with the hot and cold nuclear matter throughout the evolution of the medium via semi-hard and soft processes such as energy loss via gluon radiations and collisions. Nuclear modification of heavy flavors in p-A systems provides insight into cold nuclear matter effects such as (anti)shadowing and $k_{T}$-broadening, and serves as a baseline for A-A studies. In addition to that the fully reconstructed heavy-flavor jets provide additional information on the flavor (or mass) dependence of fragmentation, color charge effects as well as insight into the contribution of late gluon splitting. In this contribution, we present the measurements of $b$-jet production in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV and $c$-jet production in pp, p-Pb and Pb-Pb collisions measured by the ALICE experiment at the LHC. The measurements of the nuclear modification factors for $c$-jet in p-Pb and Pb-Pb collisions are also presented. The experimental measurements are compared with the results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and the NLO pQCD calculations (POWHEG+PYTHIA6). We find good agreement of the measurements with the results from Monte Carlo event generators and from NLO pQCD calculations.
description: Proceedings of 22nd High Energy Physics International Conference in Quantum Chromodynamics (QCD 19)
On the motivic measure on the space of functions
Creators: name: Gorsky, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Motivic measure on the space of functions was introduced by Campillo, Delgado and Gusein-Zade as an analog of the motivic measure on the space of arcs . In this paper we prove that the measure on the space of functions can be related to the motivic measure on the space of arcs by a factor, which can be defined explicitly in geometric terms. This provides a possibility to rewrite motivic integrals over the space of functions as integrals over the union of all symmetric powers of the space of arcs.
description: 13 pages
Οικονομική διερεύνηση επιχειρήσεων και συνεταιρισμών που δραστηριοποιούνται στον τομέα της εμπορίας των νωπών φρούτων στην Κεντρική Μακεδονία:
Creators: name: Χάμουργκα, Ευανθία Παύλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Συνεταιρεστικές οργανώσεις
Χρηματοοικονομικοί δείκτες
Εμπορία νωπών φρούτων
Agricultural cooperatives
Financial ratios
Fresh fruit trade

description: Το εμπόριο των φρούτων και λαχανικών έχει εξελιχθεί σε ένα από τους πλέον δυναμικούς κλάδους του διεθνούς εμπορίου των αγροτικών προϊόντων εξαιτίας τόσο της παγκοσμιοποίησης του εμπορίου όσο και των αλλαγών στις αγορές τροφίμων σε όλο το κόσμο, ενώ αποτελεί το σημαντικότερο κλάδο της ελληνικής γεωργίας σήμερα. Σκοπός της παρούσας εργασίας είναι η μελέτη και η αξιολόγηση της οικονομικής κατάστασης των αγροτικών συνεταιριστικών οργανώσεων που δραστηριοποιούνται στον τομέα του εμπορίου νωπών φρούτων καθώς και η σύγκριση τους με ιδιωτικές επιχειρήσεις που αναπτύσσουν όμοιες δραστηριότητες και αποτελούν τους κύριους ανταγωνιστές τους. Για την μελέτη και αξιολόγηση της οικονομικής θέσης των συνεταιρισμών σε σχέση με τις επιχειρήσεις του ιδιωτικού τομέα, χρησιμοποιήθηκε η μέθοδος της ανάλυσης χρηματοοικονομικών καταστάσεων με αριθμοδείκτες. Τα αποτελέσματα της σύγκρισης συνεταιρισμών και λοιπών ιδιωτικών επιχειρήσεων διευκολύνουν την κατανόηση της διαφορετικής πολιτικής που ακολουθείται από την κάθε κατηγορία επιχειρήσεων και δίνουν μια εικόνα σχετικά με την καλύτερη προσαρμογή των μονάδων στις νέες συνθήκες της αγοράς.
description: The supply chain of agricultural products has received a great deal of attention lately due to the globalization of trade and the changes in the international food market. Especially in Greece, the fresh fruit and vegetable sector is the most significant agricultural sector nowadays. The main objective of this study is the evaluation of the performance and financial situation of two strategic groups, Agricultural Cooperatives and Private Enterprises that specialize in the trade of fresh fruit in the North part of Greece. For this purpose financial ratios analysis is used. Through the comparison of the two different types of organizations, the paper examines what conditions facilitate effective and profitable organization involved in the fruit and vegetable market chain, with special attention to the distribution channels, the major participants, the flow of products and the application of certification systems and the marketing operation information. The results show whether the farmer’s union or the private sector’s enterprises are best positioned in the fresh fruit and vegetable market chain and point out valuable elements about the different marketing policy followed by each group.
Do extragalactic cosmic rays induce cycles in fossil diversity?
Creators: name: Medvedev, Mikhail V.
name: Melott, Adrian L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Geophysics (physics.geo-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Recent work has revealed a 62 (+/-) 3-million-year cycle in the fossil diversity in the past 542 My, however no plausible mechanism has been found. We propose that the cycle may be caused by modulation of cosmic ray (CR) flux by the Solar system vertical oscillation (64 My period) in the galaxy, the galactic north-south anisotropy of CR production in the galactic halo/wind/termination shock (due to the galactic motion toward the Virgo cluster), and the shielding by galactic magnetic fields. We revisit the mechanism of CR propagation and show that CR flux can vary by a factor of about 4.6 and reach a maximum at north-most displacement of the Sun. The very high statistical significance of (i) the phase agreement between Solar north-ward excursions and the diversity minima and (ii) the correlation of the magnitude of diversity drops with CR amplitudes through all cycles provide solid support for our model. Various observational predictions which can be used to confirm or falsify our hypothesis are presented.
description: ApJ accepted. We added a number of observational predictions, which can be used to falsify the CR hypothesis. Total: 31 pages, 8 figures
Radio signature of cosmological structure formation shocks
Creators: name: Hoeft, Matthias
name: Brueggen, Marcus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the course of the formation of cosmological structures, large shock waves are generated in the intra-cluster medium. In analogy to processes in supernova remnants, these shock waves may generate a significant population of relativistic electrons which, in turn, produce observable synchrotron emission. The extended radio relics found at the periphery of several clusters and possibly also a fraction of radio halo emission may have this origin. Here we derive an analytic expression for (i) the total radio power in the downstream region of a cosmological shock wave and (ii) the width of the radio-emitting region. These expressions predict a spectral slope close to -1 for strong shocks. Moderate shocks, such as those produced in mergers between clusters of galaxies, lead to a somewhat steeper spectrum. Moreover, we predict an upper limit for the radio power of cosmological shocks. Comparing our results to the radio relics in Abell115, 2256, and 3667, we conclude that the magnetic field in these relics is typically at a level of 0.1 mu G. Magnetic fields in the intra-cluster medium are presumably generated by the shocks themselves, this allows us to calculate the radio emission as a function of the cluster temperature. The resulting emissions agree very well with the radio power-temperature relation found for cluster halos. Finally, we show that cosmic accretion shocks generate less radio emission than merger shock waves. The latter may, however, be detected with upcoming radio telescopes.
description: 28 pages, 8 figures, MNRAS accepted
A focus on the Riemann's Hypothesis
Creators: name: Beaudu, Jean Max Coranson
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics

description: Riemann's hypothesis, formulated in 1859, concerns the location of the zeros of Riemann's Zeta function. The history of the Riemann hypothesis is well known. In 1859, the German mathematician B. Riemann presented a paper to the Berlin Academy of Mathematic. In that paper, he proposed that this function, called Riemann-zeta function takes values 0 on the complex plane when s=0.5+it. This hypothesis has great significance for the world of mathematics and physics. This solutions would lead to innumerable completions of theorems that rely upon its truth. Over a billion zeros of the function have been calculated by computers and shown that all are on this line s = 0.5+it. In this paper, we initially show that Riemann's (Zêta) function and the analytical extension of this function called (Aleph)) are distinct. After extending this function in the complex plane except the point s=1, we will show the existence and then the uniqueness of real part zeros equal to 1/2.
description: 7 pages
The transport of cosmic rays in self-excited magnetic turbulence
Creators: name: Reville, B.
name: O'Sullivan, S.
name: Duffy, P.
name: Kirk, J. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The process of diffusive shock acceleration relies on the efficacy with which hydromagnetic waves can scatter charged particles in the precursor of a shock. The growth of self-generated waves is driven by both resonant and non-resonant processes. We perform high-resolution magnetohydrodynamic simulations of the non-resonant cosmic-ray driven instability, in which the unstable waves are excited beyond the linear regime. In a snapshot of the resultant field, particle transport simulations are carried out. The use of a static snapshot of the field is reasonable given that the Larmor period for particles is typically very short relative to the instability growth time. The diffusion rate is found to be close to, or below, the Bohm limit for a range of energies. This provides the first explicit demonstration that self-excited turbulence reduces the diffusion coefficient and has important implications for cosmic ray transport and acceleration in supernova remnants.
description: 8 pages, 8 figures, accepted for publication in MNRAS
Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles I. Theoretical model -- Mass-loss history unravelled in VY CMa
Creators: name: Decin, L.
name: Hony, S.
name: de Koter, A.
name: Justtanont, K.
name: Tielens, A. G. G. M.
name: Waters, L. B. F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: Mass loss plays a dominant role in the evolution of low mass stars while they are on the Asymptotic Giant Branch (AGB). The gas and dust ejected during this phase are a major source in the mass budget of the interstellar medium. Recent studies have pointed towards the importance of variations in the mass-loss history of such objects. Aims: By modelling the full line profile of low excitation CO lines emitted in the circumstellar envelope, we can study the mass-loss history of AGB stars. Methods: We have developed a non-LTE radiative transfer code, which calculates the velocity structure and gas kinetic temperature of the envelope in a self-consistent way. The resulting structure of the envelope provides the input for the molecular line radiative calculations which are evaluated in the comoving frame. The code allows for the implementation of modulations in the mass-loss rate. This code has been benchmarked against other radiative transfer codes and is shown to perform well and efficiently. Results: We illustrate the effects of varying mass-loss rates in case of a superwind phase. The model is applied to the well-studied case of VY CMa. We show that both the observed integrated line strengths as the spectral structure present in the observed line profiles, unambiguously demonstrate that this source underwent a phase of high mass loss (~ 3.2E-4 Msun/yr) some 1000 yr ago. This phase took place for some 100 yr, and was preceded by a low mass-loss phase (~ 1E-6 Msun/yr) taking some 800 yr. The current mass-loss rate is estimated to be in the order of 8E-5 Msun/yr. Conclusions: In this paper, we demonstrate that both the relative strength of the CO rotational line profiles and the (non)-occurrence of spectral structure in the profile offer strong diagnostics to pinpoint the mass-loss history.
description: 18 pages, 10 figures, accepted for publication in "Astronomy & Astrophysics"
AXBOROT TIZIMLARINING FUNKTSIONAL BO'LIMLARI
Creators: name: Nabijonov, A.A.
name: Tojimamatov, I.N.
Publisher: name: Zenodo
Year: 2024

description: Ushbu tezisda axborot tizimlarining funktsional bo‘limlari, axborot texnologiyalarining maqsadlari va usullari aloqa va aloqaga ta'sir qiluvchi omillar haqida so‘z boradi.
Morphologies and stellar populations of galaxies in the core of Abell 2218
Creators: name: Sanchez, S. F.
name: Cardiel, N.
name: Verheijen, M.
name: Pedraz, S.
name: Covone, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: SUMMARIZED ABSTRACT: We present a study of the stellar populations and morphologies of galaxies in the core of the galaxy cluster Abell 2218. Integral field spectroscopy was obtained using PMAS/PPAK@3.5m CAHA to obtain a complete flux limited sample of cluster members within its field-of-view (~74"X64"). In addition of 31 galaxies with known redshifts in the outer regions, we built up a final sample of 59 spectroscopically confirmed cluster members. Multiban photometry and detailed morphologies were obtained using deep images taken with the HST/ACS camera in the BVRI and z-bands. The CM diagram shows that the E-type galaxies cover the range of brighter and redder colors. A large fraction of spiral galaxies ($\sim$50%) is found. They cover a wide range in colors. This result, together with the distributions of ages, metallicities and masses, indicates that E-type galaxies are more massive and have older stellar populations, while L-type galaxies are less massive and have a wider range of stellar Our results agree with a proposed two-step scenario for the evolution of galaxies in clusters. In addition, an extremely blue merging galaxy system is found at the core, with the nominal redshift of the cluster.
description: 29 pages, 17 figures, accepted for publishing in MNRAS. (HST/ACS composite image: http://www.caha.es/sanchez/abell2218/BRI_big.jpg)
A T-duality interpretation of the relationship between massive and massless magnonic TBA systems
Creators: name: Dorey, Patrick
name: Miramontes, J. Luis
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose an alternative understanding of the relationship between massive and massless magnonic TBA systems, using the T-duality symmetries of the Homogeneous sine-Gordon models. This is shown to be in agreement with a previous treatment by Dorey, Dunning and Tateo, based on the properties of Y-systems.
description: 17 pages, uses JHEP style. Refs. added. Version to be published in JSTAT
Velocity and charge reconstruction with the AMS/RICH detector
Creators: name: Arruda, Luísa
name: Barão, Fernando
name: Borges, João
name: Carmo, Fernando
name: Gonçalves, Patrícia
name: Pimenta, Mário
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Alpha Magnetic Spectrometer (AMS), to be installed on the International Space Station (ISS) in 2008, will be equipped with a proximity focusing Ring Imaging CHerenkov detector (RICH). This detector will be equipped with a dual radiator (aerogel+NaF), a lateral conical mirror and a detection plane made of 680 photomultipliers and light-guides, enabling measurements of particle electric charge and velocity. A likelihood method for the Cherenkov angle reconstruction was applied leading to a velocity determination for protons with a resolution around 0.1%. The electric charge reconstruction is based on the counting of the number of photoelectrons and on an overall efficiency estimation on an event-by-event basis. Results from the application of both methods are presented.
description: 5 pages, 3 figures. Contribution to the 5th International Workshop New Worlds in Astroparticle Physics (Faro, Portugal 2005). Presenter: Luisa Arruda
Effective field theory with a $θ$-vacua structure for 2d spin systems
Creators: name: Tanaka, Akihiro
name: Hu, Xiao
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We construct a nonlinear sigma (NL$σ$) model description of 2+1d spin systems, by coupling together antiferromagnetic spin chains via interchain exchange terms. Our mapping incorporates methods developed recently by ourselves and by Senthil and Fisher, which aim at describing competition between antiferromagnetic and valence-bond-solid orders in quantum magnets. The resulting 2+1d $O$(4) NL$σ$ model contains a topological $θ$-term whose vacuum angle $θ$ varies continuously with $δ$, the bond-alternation strength of the interchain interaction. This implies that the $θ$-vacua structure for this NL$σ$ model can be explored by tuning $δ$ in a suitable 2d spin system, which is strongly reminiscent of the situation for 1+1 AF spin chains with bond-alternation.
description: 4 pages, 2 figures
An algebraic integration for Mahler measure
Creators: name: Lalin, Matilde N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Number Theory (math.NT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 11G55, 19F99

description: There are many examples of several-variable polynomials whose Mahler measure is expressed in terms of special values of polylogarithms. These examples are expected to be related to computations of regulators, as observed by Deninger, and later Rodriguez-Villegas, and Maillot. While Rodriguez-Villegas made this relationship explicit for the two variable case, it is our goal to understand the three variable case and shed some light on the examples with more variables.
description: 3 figures
Thermodynamics of Eliashberg theory in the weak-coupling limit
Creators: name: Mirabi, Sepideh
name: Boyack, Rufus
name: Marsiglio, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The weak-coupling limits of the gap and critical temperature computed within Eliashberg theory surprisingly deviate from the BCS theory predictions by a factor of $1/\sqrt{e}$. Interestingly, however, the ratio of these two quantities agrees for both theories. Motivated by this result, here we investigate the weak-coupling thermodynamics of Eliashberg theory, with a central focus on the free energy, specific heat, and the critical magnetic field. In particular, we numerically calculate the difference between the superconducting and normal-state specific heats, and we find that this quantity differs from its BCS counterpart by a factor of $1/\sqrt{e}$, for all temperatures below $T_{c}$. We find that the dimensionless ratio of the specific-heat discontinuity to the normal-state specific heat reduces to the BCS prediction given by $ΔC_{V}(T_{c})/C_{V,n}(T_c)\approx1.43$. This gives further evidence to the expectation that all dimensionless ratios tend to their "universal values" in the weak-coupling limit.
description: 6 pages, 5 figures
Canonical Analysis of the Jackiw-Teitelboim Model in the Temporal Gauge. I. The Classical Theory
Creators: name: Constantinidis, Clisthenis P.
name: Lourenco, Jose Andre
name: Morales, Ivan
name: Piguet, Olivier
name: Rios, Alex
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: As a preparation for its quantization in the loop formalism, the 2-dimensional gravitation model of Jackiw and Teitelboim is analysed in the classical canonical formalism. The dynamics is of pure constraints as it is well-known. A partial gauge fixing of the temporal type being performed, the resulting second class constraints are sorted out and the corresponding Dirac bracket algebra is worked out. Dirac observables of this classical theory are then calculated.
description: 15 pages, Latex. Misprint corrections
Η αριστοτελική θεώρηση περί ψυχής στο έργο του Θωμά Ακινάτη και οι γνωστικές λειτουργίες της ψυχής:
Creators: name: Καραγεωργίου, Αστέριος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Αριστοτέλης
Θωμάς Ακινάτης
Ψυχή
Aristoteles
Thomas Aquinas
Soul

description: Το σύνθετο και περίπλοκο πρόβλημα της ψυχής δεν απασχόλησε μόνο την αρχαία ελληνική σκέψη αλλά αποτέλεσε και αποτελεί ένα διαχρονικό αντικείμενο μελέτης. Αντικείμενο της παρούσης εργασίας είναι η καταγραφή και η ανάδειξη της επίδρασης του έργου Περί ψυχῆς του Αριστοτέλη στα φιλοσοφικά συγγράμματα του Θωμά Ακινάτη, αλλά και η παρουσίαση της ιδιαίτερης φιλοσοφικής προσέγγισης του δεύτερου στο αριστοτελικό έργο. Η έντονη σύμπλεξη του Ακινάτη με την αριστοτελική σκέψη επηρέασε βαθιά και τη δική του. Υιοθετεί της ουσιαστικές ιδέες από τον Αριστοτέλη και αυτό είναι εμφανές στη γνωσιοθεωρία του. Η βάση της ανθρώπινης γνώσης , σύμφωνα με τον Ακινάτη, είναι η εμπειρία των αισθήσεων, έτσι ο δρόμος για τη διανοητική γνώση περνά από την αισθητηριακή γνώση μέσω της αφαίρεσης Ο Ακινάτης ακολουθώντας στο σημείο αυτό τον Αριστοτέλη ορίζει την ψυχή στην ευρεία της έννοια ως την πρώτη εντελέχεια της οργανικού σώματος ικανού να διεκπεραιώνει της λειτουργίες της ψυχής και θεωρεί ότι όλα τα όντα δεν έχουν της της ικανότητες της ψυχής.
description: The complex and complicated problem of the soul did not only preoccupy ancient Greek thought but has represented and represents a diachronic subject of study.The subject of the present thesis is to record and make known the influence Aristotle’s work On the soul had on the philosophical writings of Thomas Aquinas, but also to present the particular philosophical approach the latter had towards the Aristotelian work.The intense intertwining of Aquinas with Aristotelian thought also profoundly influenced his own thought. He adopts the basic ideas from Aristotle and this is obvious in his epistemology. The basis of human knowledge, according to Aquinas, is the experience of the senses, thus the path towards mental knowledge passes via sensory knowledge by means of abstraction. Aquinas, following Aristotle at this point, defines the soul, in its wider sense, as the first entelechy of an organic body capable of fulfilling the functions of the soul and he considers that all beings do not have the same abilities of soul.
Valores de refêrencia da actividade sanguínea do glutatião peroxidase (GSH-Px) em ovinos criados em regime extensivos na area de "dehesa"
Creators: name: BENITO HERNÁNDEZ, MILAGROS
Publisher: name: Zenodo
Year: 1997
Subjects: nutritional myodystrophy

description: Reference values of blood glutathione peroxidase in sheep at range in the area of "dehesa" in Extremadura (Spain) were stated. The aim of this work was to obtain more accurate refrences for the diagnosis and profilaxys of selenium deficiency in this geographical area. The mean value of the blood enzyme activity was 127,10 + 3,47 IU/g Hb. In some herds the activity was very low in absence of other signs of deficiency, possibly due to adaptation of the animals to deficient areas.
Velocity shift of Mg II and Al III broad absorption lines in quasar SDSS J134444.33+315007.6
Creators: name: Lu, Wei-Jian
name: Lin, Ying-Ru
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report, for the first time, a synchronized velocity shift of Mg II and Al III broad absorption lines (BALs) in quasar SDSS J134444.33+315007.6 (hereafter J1344+3150). We found this quasar from a sample of 134 Mg II BAL quasars with multi-epoch observations. This quasar contains three low-ionization BAL systems, the fastest of which at $\sim$$-17, 000\,\rm km\,s^{-1}$ shows a kinematic shift of $\sim$$-1101\,\rm km\,s^{-1}$ and $\sim$$-1170\,\rm km\,s^{-1}$ in its Mg II and Al III ions, respectively, during a rest-frame time of about 3.21 yr. Meanwhile, this quasar also shows other various variation characteristics, including an obvious weakening in its continuum, a coordinated enhancement in multiple emission lines (Mg II, C III and Al III), and a coordinated enhancement in three Al III absorption troughs. These variation characteristics convincingly indicate that the BAL outflows of J1344+3150 are under the influence from the background radiation energy. Thus, we infer that the velocity shift displayed in system A in the quasar J1344+3150 may indicate an actual line-of-sight acceleration of an outflow due to the radiation pressure from the central source.
description: 4 pages, 1 figure, accepted for publication in MNRAS Letters