cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Μελέτη απόδοσης πρωτοκόλλου MAC για ηλεκτρομαγνητικά νανοδίκτυα
Creators: name: Τσιαμπαλής, Νικόλαος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Πληροφορική
Ασύρματα δίκτυα
Ηλεκτρομαγνητικά νανοδίκτυα
Informatics
Wireless Networks
Electromagnetic nanonetworks

description: Καθώς η Νανοτεχνολογία αναπτύσσεται, δημιουργούνται ευκαιρίες για ανάπτυξη εφαρμογών που θα δώσουν λύσεις σε διάφορα πεδία όπως η Βιοιατρική, η βιομηχανία καθώς και στην κατασκευή καταναλωτικών αγαθών. Η διασύνδεση των Νανοσυσκευών αυτών αναμένεται να επεκτείνει τις δυνατότητες αυτών επιτρέποντας τους να συνεργάζονται μεταξύ τους και να ανταλλάσουν πληροφορίες. Οι παραδοσιακές μέθοδοι επικοινωνιών δεν είναι εφαρμόσιμες στα Νανοδίκτυα λόγω του μεγέθους των συσκευών και τον περιορισμένων ενεργειακών δυνατοτήτων τους. Γι’ αυτό, έχουν αρχίσει να αναπτύσσονται διάφορες προσεγγίσεις για το πώς θα καταφέρουν να διασυνδεθούν αποτελεσματικά οι συσκευές αυτές και πως θα βελτιστοποιηθεί η ανταλλαγή πληροφοριών τους. Στην εργασία αυτή, παρουσιάζεται η τεχνολογία των Νανοδικτύων, τα χαρακτηριστικά της, και οι μελλοντικές εφαρμογές της. Επιπλέον, μελετάται το πρώτο MACπρωτόκολλο, με την ονομασία PHLAME – APhysicalLayerAwareMACProtocolForElectromagneticNanonetworksintheTerahertzBand, για την επικοινωνία των Νανοσυσκευών στην μπάντα των Terahertz. Παρουσιάζεται επίσης ο προσομοιωτής που γράφτηκε για να μοντελοποιήσει τη λειτουργία του PLHAME και συγκρίνονται τα αποτελέσματα με αυτά της προαναφερθείσας εργασίας.
description: As Nanotechnology develops, new chances are arising for developing applications which will provide solutions to many different fields such as Biomedicine, industrial and consumer goods. The interconnection of these Nanodevices is expected to expand the capabilities of each Nanodevice allowing them to cooperate and communicate with each other. The traditional communication technologies are not suitable for nanonetworks because of their size and their energy limitations. Therefore, new approaches regarding their efficient interconnection have arisen in the last years. On this study, we present the technology of Nanonetworks, its characteristics and its future developments. Moreover, we study the first MAC protocol PHLAME - AphysicallayerawareMACprotocolforelectromagneticnanonetworks which proposes a new MAC layer protocol designed for the communication of Nanodevices on the Terahertz band. We also present the simulator that has been coded in order to model the operation of PHLAME, present the output results and compare them with the ones presented on the aforementioned paper.
Nonessential Functionals in Multiobjective Optimal Control Problems
Creators: name: Malinowska, Agnieszka B.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49K15; 49N90; 90C29

description: We address the problem of obtaining well-defined criteria for multiobjective optimal control systems. Necessary and sufficient conditions for an optimal control functional to be nonessential are proved. The results provide effective tools for determining nonessential objectives in vector-valued optimal control problems.
description: Presented at the 5th Junior European Meeting on Control & Information Technology (JEM'06), September 20-22, 2006, Tallinn, Estonia
Άτυπη Διεθνής Συνεργασία Κρατών
Creators: name: Κεσόγλου, Αντώνιος-Σάββας Μηνά
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: συμβουλιο ασφαλειας ΟΗΕ
G7
united nations security council

description: Ο σκοπός της παρούσας διατριβής ήταν η παρουσίαση και ανάλυση των μορφών της άτυπης διεθνούς συνεργασίας μεταξύ κρατών, της συνεργασίας δηλαδή που προκύπτει εκτός διεθνών οργανισμών. Αρχικά επιχειρήθηκε μία συνοπτική ιστορική αναδρομή και παρουσίαση των υφισταμένων δομών συνεργασίας της διεθνούς κοινότητας και κατεγράφησαν οι διαφορές μεταξύ της τυπικής και της άτυπης διεθνούς συνεργασίας. Στη συνέχεια αναλύθηκε η ad hoc άτυπη διεθνής συνεργασία, αυτή δηλαδή που προκύπτει επ’ ευκαιρία συγκεκριμένης κρίσης. Διατυπώθηκαν τα γενικά χαρακτηριστικά της λειτουργίας της και αναζητήθηκαν τα αίτια που οδήγησαν στη δημιουργία της καθώς και η νομική αιτιολόγηση της δράσης της ενώ εξετάστηκε ξεχωριστά η περίπτωση της λειτουργίας της Ομάδας Επαφής για τη Ναμίμπια. Επιπλέον, διερευνήθηκε η υπόσταση και δραστηριότητα άτυπων κρατικών συνεργατικών οχημάτων που λειτουργούν σε μόνιμο πλαίσιο. Κατεγράφησαν τα γενικά χαρακτηριστικά της δομής τους και περαιτέρω αναλύθηκε η περίπτωση της Ομάδας των Οκτώ ισχυρότερων οικονομικά κρατών(G8).Τέλος, διατυπώθηκαν οι συμπερασματικές σκέψεις του γράφοντος που αφορούν την δεσμευτικότητα και την αποτελεσματικότητα της άτυπης διακρατικής συνεργασίας αλλά και την ιεραρχική θέση της σε σχέση με τους υφιστάμενους διεθνείς οργανισμούς
description: The aim of the present thesis was the presentation and analysis of the forms of informal international cooperation among nations, that is the cooperation which takes place beyond the international organizations. At first, there was a synoptic historical reference and presentation of the existing cooperative forms of the international community and the differences between formal and informal international state cooperation were noted. Then, the ad hoc international informal cooperation was analyzed that is the one that comes up occasionally in the face of certain crisis. The general characteristics of its function were stated and the reasons that led to its creation as well as the legal foundation of its action were searched too. The case for the function of the Contact Group of Namibia was examined separately. Moreover, the substance and activeness of the informal state cooperative groups which operate on a permanent basis were investigated. The general characteristics of their structure were studied thoroughly and further the case of G8-the Group of the most powerful economical nations- was analyzed. Finally, the conclusion statements of the scholar were mentioned concerning the commitment and effectiveness of the international informal state cooperation and it’s hierarchical position with reference to the existing international organizations.
Maps to the projective plane
Creators: name: Dydak, Jerzy
name: Levin, Michael
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: General Topology (math.GN)
subject: FOS: Mathematics

description: We prove the projective plane $\rp^2$ is an absolute extensor of a finite-dimensional metric space $X$ if and only if the cohomological dimension mod 2 of $X$ does not exceed 1. This solves one of the remaining difficult problems (posed by A.N.Dranishnikov) in extension theory. One of the main tools is the computation of the fundamental group of the function space $\Map(\rp^n,\rp^{n+1})$ (based at inclusion) as being isomorphic to either $\Z_4$ or $\Z_2\oplus\Z_2$ for $n\ge 1$. Double surgery and the above fact yield the proof.
description: 17 pages
Προβληματική συμπεριφορά παιδιών σχολικής ηλικίας σε σχέση με ενδοπροσωπικούς παράγοντες και ατομικά χαρακτηριστικά
Creators: name: Ανδρέου, Ελένη
name: Μαρμαρινός, Ιωάννης
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The main purpose of this study is to examine the relationship of primary school children's self-esteem, Machiavellianism and locus of control with their problem behavior, as evaluated by teachers. The findings, based upon data collected from a sample of 77 teachers and 412 pupils, indicate that there is a significant correlation between the above mentioned personality constructs and problem behavior at school. However, this relationship is differentiated for all syndromes but not for the whole problem behavior symptoms, when the data is analyzed in conjunction with sex, age. Academic achievement and social origin of pupils. Multiple regression analysis shows that antisocial behavior is systematically associated with Machiavellianism, sex and low achievement; neurotic behavior, immaturity and psychosomatics with low self-esteem and low achievement whereas the whole of symptoms with sex, low achievement, low self-esteem, high Machiavellianism and external locus of control. Results are discussed in terms of further study and implications for classroom practice.
description: Παιδαγωγική Επιθεώρηση, Vol. 32 (2001)
Techniques for high-speed time-resolved device characterization
Creators: name: Shah, Saurin
Publisher: name: University of British Columbia
Year: 2009

description: The objective of this thesis is to address two open issues in time-resolved measurements of electronic devices. The first is the ability to perform measurements close to the device under test: we report a new approach to recover temporally-overlapping incident and reflected signals near a device. The technique involves electro-optic measurement at two locations. With suitable time-domain or Fourier-transform processing, the measured waveforms can be decomposed into components propagating towards and away from the device. We show experimental results for coplanar structures. In the second part, we have identified a new feature in measured signals that we can attribute to substrate waves excited photoconductively during electro-optic sampling on coplanar striplines. Measurements at several positions laterally displaced from the center of the transmission line show that this substrate signal is confined to the neighborhood of the electrodes when the substrate is thin. We also show that this feature, which can be an impediment to accurate S-parameter characterization, can be eliminated by delaying it out of the time window of interest. Finally, the Appendix lists the fabrication steps and process parameters for a lift-off process used to fabricate some of the samples used in this project.
Collective Excitations of Dirac Electrons in Graphene
Creators: name: Apalkov, Vadim
name: Wang, Xue-Feng
name: Chakraborty, Tapash
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two-dimensional electrons in graphene are known to behave as massless fermions with Dirac-Weyl type linear dispersion near the Dirac crossing points. We have investigated the collective excitations of this system in the presence or absence of an external magnetic field. Unlike in the conventional two-dimensional electron system, the $ν=\frac1m$ fractional quantum Hall state in graphene was found to be most stable in the $n=1$ Landau level. In the zero field case, but in the presence of the spin-orbit interaction, an undamped plasmon mode was found to exist in the gap of the single-particle continuum.
description: To be published as Proceedings of the Wuerzburg Conference, 2006
Solid helium at high pressure: A path-integral Monte Carlo simulation
Creators: name: Herrero, Carlos P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Solid helium (3He and 4He) in the hcp and fcc phases has been studied by path-integral Monte Carlo. Simulations were carried out in the isothermal-isobaric (NPT) ensemble at pressures up to 52 GPa. This allows one to study the temperature and pressure dependences of isotopic effects on the crystal volume and vibrational energy in a wide parameter range. The obtained equation of state at room temperature agrees with available experimental data. The kinetic energy, E_k, of solid helium is found to be larger than the vibrational potential energy, E_p. The ratio E_k/E_p amounts to about 1.4 at low pressures, and decreases as the applied pressure is raised, converging to 1, as in a harmonic solid. Results of these simulations have been compared with those yielded by previous path integral simulations in the NVT ensemble. The validity range of earlier approximations is discussed.
description: 7 pages, 5 figures
Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
Creators: name: Stroeer, A.
name: Heber, U.
name: Lisker, T.
name: Napiwotzki, R.
name: Dreizler, S.
name: Christlieb, N.
name: Reimers, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We address the origin and evolutionary status of hot subdwarf stars by studying the optical spectral properties of 58 subdwarf O (sdO) stars. Combining them with the results of our previously studied subdwarf B (sdB) stars, we aim at investigating possible evolutionary links. We analyze high-resolution ESO VLT UVES spectra from the ESO Supernova Ia Progenitor Survey (SPY). Effective temperatures, gravities, and helium abundances are determined simultaneously by fitting the profiles of H and He lines using dedicated synthetic spectra in NLTE. Evidence for cool companions to 8 sdOs as well as a binary consisting of two sdO stars is found. A correlation between He abundances and the presence of carbon and/or nitrogen lines emerges: below solar He abundance, no sdO shows C or N lines. In contrast, C and/or N lines are present in ALL sdOs with super- solar He abundance. We thus use the solar He abundance to divide our sample into He-deficient and He-enriched sdOs. While He-deficient sdOs are scattered in a wide range of the Teff-log(g)-diagram, most of the He-enriched sdOs cluster in a narrow region at Teff = 40,000 ... 50,000K and log(g)=5.5 ... 6.0. An evolu- tionary link between sdBs and sdOs appears plausible only for the He-deficient sdOs indicating that they are the likely successors to sdBs. The properties of He-enriched sdOs cannot be explained with canonical single star evolutionary models. Alternative scenarios (late hot flasher) as well as for binary evolution (white dwarf merger; post-RGB evolution) are tested. While we regard the post-RGB scenario as inappropriate, the white dwarf merger and the late hot flasher scenarios remain viable to explain the origin of He-enriched sdOs.
description: 14 pages, 10 figures, Astronomy & Astrophysics accepted
title: Satisfaction With Police: Explaining Variation by Race
Creators: name: Centeno, Megan N.
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 2012

description: Past research has shown that race is an important factor in predicting satisfaction with the police. Past research, however, has been inconclusive as to why this is such a significant variable. This study is designed to see if quality of life and fear of crime differences by race help explain the race and police satisfaction relationship. Data for this study comes from the "Criminal Victimization" Survey (Smith, S. K., Steadman, G.W., Minton, T. D., & Townsend, M. and 1999). The results conclude that quality of life, physical disorder and fear of crime help mediate the relationship between race and satisfaction with police, but do not fully explain why African Americans are less satisfied with the police than their white counterparts.
Κοινωνική μάθηση και αντικοινωνική συμπεριφορά
Creators: name: Μούσιου, Όλγα
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 32 (2001)
Generating curvature perturbations with or without MSSM flat directions
Creators: name: Matsuda, Tomohiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider instant preheating as the mechanism for generating the curvature perturbation at the end of chaotic inflation. Then we examine if inflation could be driven by a Minimal Supersymmetric Standard Model (MSSM) flat direction or a sneutrino. Our simple mechanism relaxes some serious constraints that appeared in past studies, making inflation driven by a MSSM flat direction or a sneutrino more plausible.
description: 20pages, no figure, added an appendix, accepted for publication in JCAP
Stochastic `Beads on a String' in the Accretion Tail of Arp 285
Creators: name: Smith, B. J.
name: Struck, C.
name: Hancock, M.
name: Giroux, M. L.
name: Appleton, P. N.
name: Charmandaris, V.
name: Reach, W.
name: Hurlock, S.
name: Hwang, J. -S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Spitzer infrared, GALEX UV, and SDSS and SARA optical images of the peculiar interacting galaxy pair Arp 285 (NGC 2856/4), and compare with a new numerical model of the interaction. We estimate the ages of clumps of star formation in these galaxies using population synthesis models, carefully considering the uncertainties on these ages. This system contains a striking example of `beads on a string': a series of star formation complexes ~1 kpc apart. These `beads' are found in a tail-like feature that is perpendicular to the disk of NGC 2856, which implies that it was formed from material accreted from the companion NGC 2854. The extreme blueness of the optical/UV colors and redness of the mid-infrared colors implies very young stellar ages (~4 - 20 Myrs) for these star forming regions. Spectral decomposition of these `beads' shows excess emission above the modeled stellar continuum in the 3.6 micron and 4.5 micron bands, indicating either contributions from interstellar matter to these fluxes or a second older stellar population. These clumps have -12.0 < M(B) < -10.6, thus they are less luminous than most dwarf galaxies. Our model suggests that bridge material falling into the potential of the companion overshoots the companion. The gas then piles up at apo-galacticon before falling back onto the companion, and star formation occurs in the pile-up. A luminous (M(B) ~ -13.6) extended (FWHM ~ 1.3 kpc) `bright spot' is visible at the northwestern edge of the NGC 2856 disk, with an intermediate stellar population (400 - 1500 Myrs). Our model suggests that this feature is part of a expanding ripple-like `arc' created by an off-center ring-galaxy-like collision between the two disks.
description: Accepted by the Astronomical Journal. For color figures and appendix material, go tohttp://www.etsu.edu/physics/bsmith/research/sg/arp285/arp285.html
Μηδενισμός και Επανάσταση στη σκέψη των Nietzsche και Camus
Creators: name: Κουντουρά, Καλλιόπη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Μηδενισμός
Επανάσταση
Νίτσε και Καμύ
Nihilism
Revolution
Nietzsche and Camus

description: Σκοπός της μελέτης με τίτλο «Μηδενισμός και Επανάσταση στη σκέψη των Nietzsche και Camus» είναι να παρουσιάσει σε έναν πρώτο βαθμό τη θέση που κατέχει ο μηδενισμός στη σκέψη των Nietzsche και Camus και κυριότερα τη διέξοδο (από τον μηδενισμό), που ο κάθε ένας ξεχωριστά προτείνει, αλλά και σε ένα δεύτερο επίπεδο να αναδειχθούν οι κοινές συνιστώσες, που υπάρχουν στη φιλοσοφική σκέψη των δύο, οι οποίες συνθέτουν την υπέρβαση του μηδενισμού εκκινώντας από την ίδια αρχή. Επισημαίνεται από την εισαγωγή της παρούσας εργασίας πως το κοινό ένστικτο υπεράσπισης της ύπαρξης, που διέπει τους δύο διανοητές, τους συγκαταλέγει αυτόματα στους «επικριτές» του μηδενισμού. Ωστόσο, τόσο ο Nietzsche όσο και ο Camus δεν αρκούνται στο να αντιτίθενται στον μηδενισμό, αλλά προκρίνουν τρόπους υπέρβασής του.
description: The aim of the dissertation entitled “Nihilism and Revolution in the thought of Nietzsche and Camus” is to present in a first level the place that nihilism holds in the thought of Nietzsche and Camus but most importantly the ways to exit nihilism proposed by the two thinkers. In a second level the essay attempts to show the common constituents in Nietzsche’s and Camus’s thought through which the overcoming of nihilism is composed on a shared basis, since their common interest defending the importance of existence grounds them as critics of nihilism. Hence, the purpose of our argument is to indicate the specific ways through which the two thinkers attempt nihilism’s overcoming.
A self-consistent determination of the temperature profile and the magnetic field geometry in winds of late-type stars
Creators: name: Vidotto, A. A.
name: Falceta-Goncalves, D.
name: Jatenco-Pereira, V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Cool giant and supergiant stars generally present low velocity winds with high mass loss rates. Several models have been proposed to explain the acceleration process of these winds. Although dust is known to be present in these objects, the radiation pressure on these particles is uneffective in reproducing the observed physical parameters of the wind. The most promising acceleration mechanism cited in the literature is the transference of momentum and energy from Alfven waves to the gas. Usually, these models consider the wind to be isothermal. We present a stellar wind model in which the Alfven waves are used as the main acceleration mechanism, and determine the temperature profile by solving the energy equation taking into account both the radiative losses and the wave heating. We also determine self-consistently the magnetic field geometry as the result of the competition between the magnetic field and the thermal pressures gradient. As main result, we show that the magnetic geometry present a super-radial index in the region where the gas pressure is increasing. However, this super-radial index is greater than that observed for the solar corona.
description: Accepted for publication in Space Science Reviews. Presented at the World Space Environment Forum 2005, Austria. 8 pages, 2 figures
Ο «θεός» του Πλάτωνα.
Creators: name: Δρογούτη, Γεωργία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Πλάτων
Θεός
Αρχαία Εληνική φιλοσοφία
Plato
God
Ancient Greek philosophy

description: Σκοπός της διατριβής ήταν η εξέταση του ρόλου του θεού στην πλατωνική φιλοσοφία. Ο Πλάτων με το σύστημά του προσπάθησε αφ’ ενός να δώσει απαντήσεις αναφορικά με τις πρώτες αρχές και αφ’ ετέρου να δώσει κατευθυντήριες γραμμές για τον ορθό τρόπο ζωής. Η δική του πρόταση, η οποία υπήρξε ταυτόχρονα και μία απάντηση στην σοφιστική και τον μηχανιστικό υλισμό, καθώς και τον ηθικό σχετικισμό που αμφότερα τα ρεύματα συνεπάγονται, ήταν η θεωρία των Ιδεών και ύψιστη πλατωνική αρχή η Ιδέα του Αγαθού. Οι Ιδέες και το Αγαθό, που, πιθανώς, προσέλαβαν μαθηματικό χαρακτήρα στην πορεία της σκέψης του, θα μπορούσαν να λειτουργήσουν ως πρότυπο για τον ηθικό βίο. Ωστόσο, το σύνολο των ανθρώπων δεν ήταν δυνατό να συλλάβουν τις πλατωνικές αρχές λόγω της ανεπαρκούς φύσης τους ή της ελλιπούς παιδείας τους. Αυτό, ακριβώς, αποτελεί το σημείο όπου υπεισέρχεται ο θεός, ο οποίος θα αποτελέσει ένα μέσο για το πλήθος, που δεν μπορεί να συλλάβει την αλήθεια, ώστε να οδηγηθεί στον ηθικό βίο. Ο θεός, λοιπόν, στην φιλοσοφία του Πλάτωνα, όπως προσπάθησε να υποστηρίξει η παρούσα διατριβή, έχει περισσότερο εργαλειακή και πρακτική χρησιμότητα. Έτσι, ο ορθολογιστής Πλάτωνας, θα επιτρέψει την είσοδο στο ανορθολογικό στοιχείο, προκειμένου να μην αφήσει το μεγαλύτερο μέρος του πλήθους σε μία μοίρα απουσίας ηθικής.
description: The aim of the thesis was to examine the role of god in platonic philosophy. Plato in his system tried on the one hand to provide answers regarding the first principles and on the other to give guidelines for an advisable lifestyle. His own proposal, which was simultaneously an answer on sophistic and mechanistic materialism and moral relativism that both movements involved, was the theory of Ideas and the highest platonic authority was the Idea of the Good. The Ideas and the Good, that probably recruited mathematical character in the process of his thought, could function as a model for moral life. However, all of the people could not grasp the platonic principles due to their inadequate nature or lack of education. This, exactly, is the point where god was involved, who will be a medium for the crowd that can not grasp the truth, in order to be guided to moral life. God, therefore, in Plato’s philosophy, as the present thesis tried to support, has more tooling and practical utility. Thus, the rationalist Plato allowed the entry to the irrational element in order not to leave the majority of the crowd in a fate of morals absence.
Αναζητώντας μία αποτελεσματική πρόταση για τη διδασκαλία της Νέας Ελληνικής ως δεύτερης γλώσσας (ΝΕΓ2) σε παλιννοστούντες και αλλοδαπούς μαθητές
Creators: name: Κοιλιάρη, Α.
name: Αγοραστός, Γ.
name: Ζάγκα, Ε.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The article is focusing on the problems brought forward while teaching Greek as a second language and discusses possibilities of innovation. By registering all the parameters determining learning Greek as a second language is suggested to support Greek language learning also through the content of other subjects at school, the innovation of curricula and. teacher's further specialized training.
description: Παιδαγωγική Επιθεώρηση, Vol. 32 (2001)
Exact solution of the mixed-spin Ising model on a decorated square lattice with two different kinds of decorating spins on horizontal and vertical bonds
Creators: name: Strecka, Jozef
name: Canova, Lucia
name: Jascur, Michal
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The mixed spin-(1/2, S_B, S_C) Ising model on a decorated square lattice with two different kinds of decorating spins S_B and S_C placed on its horizontal and vertical bonds, respectively, is exactly solved by establishing a precise mapping relationship with the corresponding spin-1/2 Ising model on an anisotropic square (rectangular) lattice. The effect of uniaxial single-ion anisotropy acting on both types of decorating spins S_B and S_C is examined in particular. If decorating spins S_B and S_C are integer and half-odd-integer, respectively, or if the reverse is the case, the model under investigation displays a very peculiar critical behavior beared on the spontaneously ordered 'quasi-1D' spin system, which appears as a result of the single-ion anisotropy strengthening. We have found convincing evidence that this remarkable spontaneous ordering virtually arises even though all integer-valued decorating spins tend towards their 'non-magnetic' spin state S=0 and the system becomes disordered only upon further increase of the single-ion anisotropy. The single-ion anisotropy parameter is also at an origin of various temperature dependences of the total magnetization when imposing the pure ferrimagnetic or the mixed ferro-ferrimagnetic character of the spin arrangement.
description: 10 pages, 5 figures, submitted to Phys. Rev. B
Η ανάπτυξη προγραμμάτων σε μικροεπίπεδο ως διαδικασία
Creators: name: Ιωαννίδου-Κουτσελίνη, Μαίρη
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: In this article curriculum development in micro-level is viewed as a procedure underlying the pedagogical autonomy of teachers. It is supported that the new era of globalization, meta-modernity and the European unification demands new roles for both, students and teachers. In these context teachers as curriculum developers make decisions about the modification of the undifferentiated curriculum in order to meet the needs of all students. Issues of Needs Assessment and Differentiation are examined as important pedagogical procedures closely related to teachers' role as curriculum developers.
description: Παιδαγωγική Επιθεώρηση, Vol. 32 (2001)
Influence de l'élasticité des lignes d'arbres, des roulements et du carter sur les vitesses critiques de rotation d'une transmission par engrenages
Creators: name: Rigaud, Emmanuel
name: Sabot, Jean
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The dynamic behaviour of a gearbox fitted out with a helical gear pair is studied. Shafts, bearings and housing are discretised using the finite element method. The elastic coupling between the toothed wheels is characterised by a 12x12 stiffness matrix. The calculation of the vibration response induced by the static transmission error shows that the highest dynamic mesh forces correspond to a resonant excitation of modes which have a high mesh stiffness energy. The numerical simulations show that a realistic prediction of the critical rotational speeds should take account of all the components of the gearbox.
Very large Magneto-impedance and its scaling behavior in amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon
Creators: name: Kaviraj, B.
name: Ghatak, S. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magneto-impedance (MI) effects have been observed for amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon which has been excited by an a.c. magnetic field parallel to the length of the ribbon. Maximum relative change in MI as large as -99% was observed which has never been reported before. The relative change in MI, when plotted against scaled field was found to be nearly frequency independent. A phenomenological formula for magneto-impedance, Z(H), in a ferromagnetic material, is proposed based on Pade approximant to describe the scaled behavior of MI.
description: 20 pages, 7 figures, article in press, Physica B (2007)
A Combinatorial Family of Near Regular LDPC Codes
Creators: name: Krishnan, K. Murali
name: Singh, Rajdeep
name: Chandran, L. Sunil
name: Shankar, Priti
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: An elementary combinatorial Tanner graph construction for a family of near-regular low density parity check codes achieving high girth is presented. The construction allows flexibility in the choice of design parameters like rate, average degree, girth and block length of the code and yields an asymptotic family. The complexity of constructing codes in the family grows only quadratically with the block length.
description: 5 pages 3 figures
maTE: Discovering Expressed MicroRNA – Target Interactions
Creators: name: Yousef, Malik
name: Loai  Abdallah
name: Allmer, Jens
Publisher: name: F1000 Research Limited
Year: 2019

description: Abstract
Motivation: Disease is often manifested via changes in transcript and protein abundance. MicroRNAs (miRNAs) are instrumental in regulating protein abundance and may measurably influence transcript levels, as well. MicroRNAs often target more than one mRNA (for human the average is three) and mRNAs are often targeted by more than one miRNA (for the genes considered in this study, the average is also three). Therefore, it is difficult to deduce the miRNAs that may cause the observed differential gene expression.
We present a novel approach, maTE, based on machine learning, which integrates information about miRNA target genes with gene expression data. maTE depends on the availability of a sufficient amount of patient and control samples. The samples are used to train classifiers to accurately classify the samples on a per miRNA basis. Multiple high scoring miRNAs are used to build a final classifier to improve separation.
Results: The aim of the study is to find a set of miRNAs causing regulation of their target genes that best explains the difference between groups (e.g.: cancer vs. control). maTE provides a list of significant groups of genes where each group is targeted by a specific microRNA. For the datasets used in this study, maTE generally achieves an accuracy well above 80%. It is of note, that when the accuracy is much lower (e.g.: ~50%) the set of miRNAs provided is likely not causative for the difference in expression.
Availability: The KNIME workflow, implThis new approach of integrating miRNA regulation with expression data yields powerful results and is independent of external labels and training data. Thereby, it opens up new avenues for exploring miRNA regulation and may pave the way for the development of miRNA-based biomarkers and drugs.
 maTE, is available at http://malikyousef.com
Εκπαιδευτική και κοινωνική ένταξη των φοιτητών με ειδικές ανάγκες: προβλήματα και προοπτικές
Creators: name: Δόικου, Μάρω
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: This article presents, the main difficulties faced by University students with special needs with regard to academic progress and social interaction. It aims to a review of support services provided by Universities in European countries and in USA. This paper addresses concerns about legislation since the statute does not guarantee educational accessibility for students with special needs in Greece. It is suggested that there is a relatively low incidence of research findings regarding social interaction between students with disabilities and their no-disabled peers. It is also suggested that there is a dearth of research and services rendered for University students with learning disabilities in Greece.
description: Παιδαγωγική Επιθεώρηση, Vol. 32 (2001)
Η καταχρηστική άσκηση δικαιώματος στην κατάσχεση εις χείρας τρίτου
Creators: name: Μπερμπερη, Αναστασία Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: κατάσχεση
εις χείρας τρίτου
κατάχρηση δικαιώματος
seizure
in the hands of third parties
abuse of rights

description: Σκοπός της παρούσας μελέτης ήταν η εξέταση της καταχρηστικής άσκησης δικαιώματος ειδικά στο πεδίο της κατάσχεσης εις χείρας τρίτου. Αρχικά, αναλύσαμε περιπτώσεις κατάχρησης από την επισκόπηση της πρόσφατης νομολογίας και στη συνέχεια, προσπαθήσαμε να εξειδικεύσουμε την εφαρμογή του άρθρου 951 παράγραφος 2 του Κώδικα Πολιτικής Δικονομίας στην κατάσχεση εις χείρας τρίτου. Επιπλέον, ασχοληθήκαμε με τους τρόπους προβολής της καταχρηστικότητας τόσο από τον οφειλέτη, όσο και από τον τρίτο.
description: The aim of the present study was to examine the abusive exercise of rights especially in the field of seizure in the hands of third parties. At first, we analyzed instances of abusive exercise of rights through the overview of the recent judicial decisions and afterwards, we tried to specify the implementation of the article 951 paragraph 2 of the Code of Civil Procedure in the seizure in the hands of third parties. Furthermore, we dealt with ways of pleading the abuse of rights from the debtor, as well as from the third parties.
Spectropolarimetry of the Peculiar Type Ia SN 2005hk
Creators: name: Chornock, Ryan
name: Filippenko, Alexei V.
name: Branch, David
name: Foley, Ryan J.
name: Jha, Saurabh
name: Li, Weidong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Keck spectropolarimetry of the unusual type Ia supernova (SN Ia) 2005hk several days before maximum light. An analysis of the high signal-to-noise-ratio total-flux spectrum shows the object's extreme similarity to the peculiar SN 2002cx. SN 2005hk has an optical spectrum dominated by Fe III lines and only weak lines of intermediate-mass elements, unlike a normal SN Ia at this epoch. The photospheric velocity measured from the minima of strong absorption lines is very low for an SN Ia (~6000 km s^{-1}), solidifying the connection to SN 2002cx. The spectrum-synthesis code Synow was used to identify the presence of iron-peak elements, intermediate-mass elements, and possibly unburned carbon at similar velocities in the outer ejecta of SN 2005hk. Many weak spectral features remain unidentified. The spectropolarimetry shows a low level of continuum polarization (~0.4%) after correction for the interstellar component and only a weak Fe III line feature is detected. The level of continuum polarization is normal for an SN Ia, implying that the unusual features of SN 2005hk cannot be readily explained by large asymmetries.
description: 20 pages, 1 table, 5 figures, to appear in May 06 issue of PASP, revised to match accepted version
Η έννοια της φιλίας και του φίλου στα κείμενα του ελληνορωμαϊκού κόσμου και της Καινής Διαθήκης. Διακειμενική ερμηνευτική προσέγγιση
Creators: name: Αργυριάδου, Αναστασία Αριστείδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Φιλία στην Καινή Διαθήκη
Φίλος στην Καινή Διαθήκη
Ελληνορωμαϊκός Κόσμος
Friendship in New Testament
Friend in New Testament
Greco- Roman World

description: Η παρούσα διακειμενική μελέτη διερευνά την παρουσία της έννοιας της «φιλίας» και του «φίλου» στα κείμενα του ελληνορωμαϊκού κόσμου και της Καινής Διαθήκης. Η αντίληψη περί φιλίας δεν είναι σταθερή σε όλους τους αρχαίους συγγραφείς, αλλά μεταβάλλεται και εξελίσσεται. Στην ελληνορωμαϊκή εποχή, σύμφωνα με την καθημερινή, κοινή χρήση, ο «φίλος» είναι αυτός που θα συμπαρασταθεί και θα βοηθήσει στην ανάγκη του φίλου του. Παράλληλα, σημαντικά χαρακτηριστικά της εξιδανικευμένης φιλοσοφικής φιλίας είναι η κοινοκτημοσύνη των υλικών αγαθών, η ισότητα και η ομόνοια μεταξύ των φίλων, όπως και η προθυμία της θυσίας για τον φίλο. Στους συγγραφείς της Καινής Διαθήκης, οι έννοιες της «φιλίας» και του «φίλου» εμφανίζονται τόσο με τα χαρακτηριστικά της καθημερινής αντίληψης για τον φίλο όσο και με τα εξιδανικευμένα χαρακτηριστικά της φιλίας. Ωστόσο, η έννοια της φιλίας αποκτά εδώ, ειδικά μέσα στο κήρυγμα των Αποστόλων, μία νέα διάσταση: Όλοι οι Χριστιανοί είναι φίλοι μεταξύ τους, ανεξάρτητα από τοπικούς και πολιτισμικούς περιορισμούς, καθώς συνδέονται με την κοινή πίστη στην Ανάσταση του Χριστού. Η φιλία ανάμεσα στον άνθρωπο και στον Θεό είναι εφικτή, με την προϋπόθεση ότι ο άνθρωπος ζει σύμφωνα με το θέλημά Του. Γι’ αυτό τον λόγο ο Ιησούς Χριστός είναι το αρχέτυπο του αληθινού φίλου, ο οποίος θυσίασε την ζωή Του για να λυτρώσει τον άνθρωπο και να του χαρίσει την αιώνια ζωή.
description: The present intertextual study negotiates the sense of ‘friendship’ and ‘friend’ through the texts of the Greek-Roman World and New Testament. The concept of friendship is not stable for all the ancient writers, but it mutates and evolves. At the Greek-Roman age, according the everyday, common sense, a ‘friend’ is somebody who will stand by and help his friend to the need. At the same time, significant characteristics of the idealized by the philosophers’ friendship, are the joint ownership of the goods, the equity and the concord between friends, along with the willingness of sacrifice for the friend. At the writers of the New Testament, the senses of ‘friendship’ and ‘friend’ appear as with the characteristics of the common sense for the friend as well as with ideal characteristics. However, the sense of friendship gets here, especially in the preaching of the Apostles, a new dimension: All Christians are friends between them, beyond of local and cultural limitations, as they are bonded by the common belief to the Resurrection of Christ. Friendship between the man and the God is possible provided that he lives according His will. That’s why Jesus Christ is the archetype of the real friend, who sacrificed His life to redeem the man and donate him the eternal life.
Το γίγνεσθαι της προσωποκεντρικής προσέγγισης: μια προσωποκεντρική αντίληψη του Προσώπου
Creators: name: Schmid, Peter
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 31 (2001)
Modélisation et analyse de l'erreur statique de transmission d'un engrenage. Influence des déformations des roues et interactions entre les couples de dents en prise
Creators: name: Rigaud, Emmanuel
name: Barday, Denis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We have developped a numerical tool in order to predict vibratory excitation of a gearbox induced by the meshing process. We propose a method based on a 3D Finite Element modelling of each toothed wheel. A non linear algorithm computes the fluctuations of static transmission error and mesh stiffness. Numerical simulations show the effect of wheel body deformation and the interactions between adjacent loaded teeth. The method developped allows to analyse the effect of different tooth modification types an manufacturing errors on the static transmission error.
Φαινομενογραφία: Μια νέα πρόταση στη σύγχρονη παιδαγωγική έρευνα
Creators: name: Δουμά, Κυριακή
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 31 (2001)
A Large Sample of BL Lacs from SDSS and FIRST
Creators: name: Plotkin, Richard M.
name: Anderson, Scott F.
name: Hall, Patrick B.
name: Margon, Bruce
name: Voges, Wolfgang
name: Schneider, Donald P.
name: Stinson, Gregory
name: York, Donald G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a large sample of 501 radio-selected BL Lac candidates from the combination of the Sloan Digital Sky Survey (SDSS) Data Release 5 optical spectroscopy and from the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) radio survey; this is one of the largest BL Lac samples yet assembled, and each object emerges with homogeneous data coverage. Each candidate is detected in the radio from FIRST and confirmed in SDSS optical spectroscopy to have: (1) no emission feature with measured rest equivalent width larger than 5 Angstroms; and (2) no measured Ca II H/K depression larger than 40%. We subdivide our sample into 426 higher confidence candidates and 75 lower confidence candidates. We argue that contamination from other classes of objects that formally pass our selection criteria is small, and we identify a few very rare radio AGN with unusual spectra that are probably related to broad absorption line quasars. About one-fifth of our sample were known BL Lacs prior to the SDSS. A preliminary analysis of the sample generally supports the standard beaming paradigm. While we recover sizable numbers of low-energy and intermediate-energy cutoff BL Lacs (LBLs and IBLs, respectively), there are indications of a potential bias toward recovering high-energy cutoff BL Lacs (HBLs) from SDSS spectroscopy. Such a large sample may eventually provide new constraints on BL Lac unification models and their potentially peculiar cosmic evolution; in particular, our sample contains a significant number of higher redshift objects, a sub-population for which the standard paradigm has yet to be rigorously constrained.
description: 16 pages, 13 figures, 6 tables. Accepted for Publication in the Astronomical Journal
Modeling emergent tissue organization involving high-speed migrating cells in a flow equilibrium
Creators: name: Beyer, Tilo
name: Meyer-Hermann, Michael
Publisher: name: arXiv
Year: 2006
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences

description: There is increasing interest in the analysis of biological tissue, its organization and its dynamics with the help of mathematical models. In the ideal case emergent properties on the tissue scale can be derived from the cellular scale. However, this has been achieved in rare examples only, in particular, when involving high-speed migration of cells. One major difficulty is the lack of a suitable multiscale simulation platform, which embeds reaction-diffusion of soluble substances, fast cell migration and mechanics, and, being of great importance in several tissue types, cell flow homeostasis. In this paper a step into this direction is presented by developing an agent-based mathematical model specifically designed to incorporate these features with special emphasis on high speed cell migration. Cells are represented as elastic spheres migrating on a substrate in lattice-free space. Their movement is regulated and guided by chemoattractants that can be derived from the substrate. The diffusion of chemoattractants is considered to be slower than cell migration and, thus, to be far from equilibrium. Tissue homeostasis is not achieved by the balance of growth and death but by a flow equilibrium of cells migrating in and out of the tissue under consideration. In this sense the number and the distribution of the cells in the tissue is a result of the model and not part of the assumptions. For purpose of demonstration of the model properties and functioning, the model is applied to a prominent example of tissue in a cellular flow equilibrium, the secondary lymphoid tissue. The experimental data on cell speed distributions in these tissues can be reproduced using reasonable mechanical parameters for the simulated cell migration in dense tissue.
description: 27 pages, 7 figures v2 major conceptual changes: stronger focus on model architecture; new Fig 6, fitting of migration parameters; reduced Fig 7 (formerly Fig 6), shortened presentation of the application; equation (3) provided in more detail; Fig 5 extended
Ανάπτυξη Οντολογίας για τη δομή και τη λειτουργία Τηλεπικοινωνιακού Οργανισμού
Creators: name: Πολυμενίδου, Αικατερίνη Ηλία
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Οντολογία (Πληροφορική)
Σημασιολογικός Ιστός
Τηλεπικοινωνίες
Ontology (Informatics)
Semantic Web
Telecommunications

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η μελέτη του Σημασιολογικού Ιστού και κατ’ επέκταση των Οντολογιών που χρησιμοποιούνται για την αναπαράσταση γνώσης. Το θέμα της Οντολογίας που επιλέχθηκε να υλοποιηθεί, αφορά στη δομή ενός Τηλεπικοινωνιακού Οργανισμού. Για το σκοπό αυτόν, βασιστήκαμε στα στοιχεία και τη δομή της ιστοσελίδας του Οργανισμού Τηλεπικοινωνιών της Ελλάδος (ΟΤΕ Α.Ε.). Η οντολογία που αναπτύχθηκε με τη βοήθεια του εργαλείου Protégé στη γλώσσα οντολογιών OWL αντικατοπτρίζει κυρίως τα προϊόντα και τις υπηρεσίες του οργανισμού, καθώς και τη σχέση του με τους πελάτες.
description: The dissertation’s main goal is to study Semantic Web and consequently to analyze Ontologies which are being used for the purposes of the Semantic Web. More specifically, the domain of the Ontology that was selected for implementation, concerns the structure and functionality of a Telecommunication Organization. For this purpose we have utilized the information that is provided through the main web page of the Hellenic Telecommunications Organization (OTE S.A.). The ontology we have developed in the OWL language using Protégé ontology editor mainly represents the products and services of the organization, as well as their relationship to customers.
On the Araki-Lieb-Thirring inequality
Creators: name: Audenaert, Koenraad M. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 15A60

description: We prove an inequality that complements the famous Araki-Lieb-Thirring (ALT) inequality for positive matrices $A$ and $B$, by giving a lower bound on the quantity $\trace[A^r B^r A^r]^q$ in terms of $\trace[ABA]^{rq}$ for $0\le r\le 1$ and $q\ge0$, whereas the ALT inequality gives an upper bound. The bound contains certain norms of $A$ and $B$ as additional ingredients and is therefore of a different nature than the Kantorovich type inequality obtained by Bourin (\textit{Math. Inequal. Appl.} \textbf{8}(2005) pp. 373--378) and others. Secondly, we also prove a generalisation of the ALT inequality to general matrices.
description: 5 pages; accepted version for Intl. J. of Information and Systems Sciences; references added; special issue on "Matrix Analysis and Applications"