cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantised Vortices in an Exciton-Polariton Fluid
Creators: name: Lagoudakis, K. G.
name: Wouters, M.
name: Richard, M.
name: Baas, A.
name: Carusotto, I.
name: Andre, R.
name: Dang, Le Si
name: Deveaud-Pledran, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: One of the most striking quantum effects in a low temperature interacting Bose gas is superfluidity. First observed in liquid 4He, this phenomenon has been intensively studied in a variety of systems for its amazing features such as the persistence of superflows and the quantization of the angular momentum of vortices. The achievement of Bose-Einstein condensation (BEC) in dilute atomic gases provided an exceptional opportunity to observe and study superfluidity in an extremely clean and controlled environment. In the solid state, Bose-Einstein condensation of exciton polaritons has now been reported several times. Polaritons are strongly interacting light-matter quasi-particles, naturally occurring in semiconductor microcavities in the strong coupling regime and constitute a very interesting example of composite bosons. Even though pioneering experiments have recently addressed the propagation of a fluid of coherent polaritons, still no conclusive evidence is yet available of its superfluid nature. In the present Letter, we report the observation of spontaneous formation of pinned quantised vortices in the Bose-condensed phase of a polariton fluid by means of phase and amplitude imaging. Theoretical insight into the possible origin of such vortices is presented in terms of a generalised Gross-Pitaevskii equation. The implications of our observations concerning the superfluid nature of the non-equilibrium polariton fluid are finally discussed.
description: 14 pages, 4 figures
Relating the $b$ ghost and the vertex operators of the pure spinor superstring
Creators: name: Chandia, Osvaldo
name: Vallilo, Brenno Carlini
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The OPE between the composite $b$ ghost and the unintegrated vertex operator for massless states of the pure spinor superstring is computed and shown to reproduce the structure of the bosonic string result. The vanishing of the double pole singularity is Lorentz gauge and the single pole is shown to be equal to the corresponding integrated vertex operator.
description: Latex, 24 pages, 1 figure. Reference added. Minor corrections
Electroweak Baryogenesis in the nMSSM
Creators: name: Konstandin, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this talk, electroweak baryogenesis in the nMSSM is discussed. We focus on differences compared to the MSSM. We conclude that electroweak baryogenesis in the nMSSM is rather generic. Still, sfermions of the first two generations are required to be heavy to evade constraints from electric dipole moments.
description: 4 pages, to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 2006
Parton showers with quantum interference: leading color, spin averaged
Creators: name: Nagy, Zoltan
name: Soper, Davison E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have previously described a mathematical formulation for a parton shower based on the approximation of strongly ordered virtualities of successive parton splittings. Quantum interference, including interference among different color and spin states, is included. In this paper, we add the further approximations of taking only the leading color limit and averaging over spins, as is common in parton shower Monte Carlo event generators. Soft gluon interference effects remain with this approximation. We find that the leading color, spin averaged shower in our formalism is similar to that in other shower formulations. We discuss some of the differences.
description: 35 pages, 13 figures
Stable Manifolds and the Transition to Turbulence in Pipe Flow
Creators: name: Viswanath, D.
name: Cvitanovic, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Lower-branch traveling waves and equilibria computed in pipe flow and other shear flows appear intermediate between turbulent and laminar motions. We take a step towards connecting these lower-branch solutions to transition by deriving a numerical method for finding certain special disturbances of the laminar flow in a short pipe. These special disturbances cause the disturbed velocity field to approach the lower-branch solution by evolving along its stable manifold. If the disturbance were slightly smaller, the flow would relaminarize, and if slightly larger, it would transition to a turbulent state.
Faint far-infrared sources: Galaxies, clusters, or cluster galaxies
Creators: name: Vaisanen, P.
name: Juvela, M.
name: Mattila, K.
name: Kotilainen, J. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from an on-going follow-up campaign of far-infrared sources detected as part of our ISOPHOT Cosmic IR Background project. Fields have been imaged in the optical and near-infrared, and we find at least a third of the FIR targets areas to contain a bright and nearby star-forming galaxy. We also explore the largely neglected possibility that instead of individual galaxies some of the fainter FIR sources are confused sums of several sources - or even whole cores of galaxy clusters at redshifts of z \sim 0.4-0.8. We look for correlations in the FIR positions with extremely red objects (EROs) and significant peaks in the galaxy surface density and peaks in cluster red sequence signal. Several matches are found and we have set out to study cluster candidates spectroscopically. The campaign is producing an interesting base to study IR-luminous, strongly star-forming galaxies in potential cluster environments.
description: 2 pages, Proceedings of Vth Marseille Int. Cosmology Conference: The fabulous destiny of galaxies, June 20-24, 2004
Κριτήρια επιλογής βαλκανικών γλωσσών και ρωσικής γλώσσας από ενήλικες: η περίπτωση του ΙΜΧΑ
Creators: name: Καλογήρου, Χρυσή Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Βαλκάνια
Κριτήρια επιλογής γλωσσών
Βαλκανικές γλώσσες
Χερσόνησος του Αίμου
Εκμάθηση γλωσσών
Ξένες γλώσσες
The balkans
Criteria of foreign language choice
Balkan languages
Aimos peninsula
Language learning
Foreign language

description: Η παρούσα εργασία στόχο έχει να καταδείξει τους λόγους, για τους οποίους μαθαίνουν τις γλώσσες των χωρών της χερσονήσου του Αίμου οι ενήλιες σπουδαστές της Σχολής Βαλκανικών Γλωσσών και Ρωσικής του ΙΜΧΑ. Πρώτα γίνεται αναφορά στην πολυγλωσσία στους κόλπους της Ευρωπαϊκής Ενωσης, από τη στιγμή που η πολυγλωσσία συνδέεται άμεσα με την εκμάθηση γλωσσών και παρουσιάζεται με συντομία μια ειδική έρευνα για τους Ευρωπαίους και τις γλώσσες που μιλούν περισσότερο. Στη συνέχεια περιγράφεται η κατάσταση στην Ελλάδα και η σχέση των Ελλήνων με τις ξένες γλώσσες και παρουσιάζεται η βαλκανική χερσόνησος, το σημερινό τοπίο στα Βαλκάνια και η σχέση της Ελλάδας με τα Βαλκάνια. Γίνεται κατόπιν μια αναφορά στις βαλκανικές σπουδές στην Ελλάδα και, αφού παρουσιάζεται το ΙΜΧΑ, ακολουθεί η παρουσίαση της αφετηρίας και του στόχου της έρευνας, η μεθοδολογία της, η παρουσίαση και ο σχολιασμός των δεδομένων και η στατιστική επεξεργασία τους καθώς και τα συμπεράσματα σχετικά με τα κριτήρια εκμάθησης των βαλκανικών γλωσσών και της ρωσικής από ενήλικες.
description: The aim of the present paper is to demonstrate the reasons the students of the School of the Balkan and Russian language choose to learn the languages spoken in the countries of the Aimos (Balkan) Peninsula. Firstly, polyglotism is presented within the European Union since polyglotism is directly connected to the foreign language learning. A special study concerning the Europeans and the preferred foreign languages is, also, briefly demonstrated. Then, there is a description of the conditions in Greece and the attitude of the Greeks towards language learning. Moreover, there is a presentation of the Balkan Peninsula, the current state in the Balkans and the relationship between the Balkans and Greece. Furthermore, there is a report on the Balkan studies in Greece and after the presentation of the Foundation for Aimos (Balkan) Peninsula Studies, follows the reference to the starting point and the aim of this research, the methodology, the presentation and the commentary on the given facts, the statistical processing and finally, the conclusions drawn related to the criteria of the Balkan and Russian language learning.
Thermal performance of GaInSb quantum well lasers for silicon photonics applications
Creators: name: Fitch, Christopher R.
name: Read, Graham W.
name: Marko, Igor P.
name: Duffy, Dominic A.
name: Cerutti, Laurent
name: Rodriguez, Jean-Baptiste
name: Tournié, Eric
name: Sweeney, Stephen J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A key component for the realization of silicon-photonics are integrated lasers operating in the important communications band near 1.55 $μ$m. One approach is through the use of GaSb-based alloys which may be grown directly on silicon. In this study, silicon-compatible strained Ga$_{0.8}$In$_{0.2}$Sb/Al$_{0.35}$Ga$_{0.65}$As$_{0.03}$Sb$_{0.97}$ composite quantum well (CQW) lasers grown on GaSb substrates emitting at 1.55 $μ$m have been developed and investigated in terms of their thermal performance. Variable temperature and high-pressure techniques were used to investigate the influence of device design on performance. These measurements show that the temperature dependence of the devices is dominated by carrier leakage to the X minima of the Al$_{0.35}$Ga$_{0.65}$As$_{0.03}$Sb$_{0.97}$ barrier layers accounting for up to 43% of the threshold current at room temperature. Improvement in device performance may be possible through refinements in the CQW design, while carrier confinement may be improved by optimization of the barrier layer composition. This investigation provides valuable design insights for the monolithic integration of GaSb-based lasers on silicon.
BCG Project Newsletter Issue 4 (October 2024)
Creators: name: Hardy, Jonathan
name: Kubicka, Hanna
Publisher: name: University of the Arts London
Year: 2024
Subjects: classificationCode: 350604
subject: Marketing communications
classificationCode: 470107
subject: Media studies
classificationCode: 470106
subject: Media industry studies
classificationCode: 480302
subject: Comparative law
classificationCode: 480411
subject: Media and communication law
classificationCode: 470101
subject: Communication studies

description: This is the fourth issue of a newsletter for the Branded Content Governance (BCG) Project (2022-25). The newsletter reports on activities of the BCG Project and includes other information we hope will be of interest to readers. This issue includes the call for papers for our Conference on 3-4 July 2025 and details of our Year 2 publications, interim versions of our 32 country reports on branded content regulation and a 122pp report Mapping the Media-Marketing Ecology. These reports will be published in final form in advance of our conference in 2025. Newsletter Issue 4 contents: Welcome to Issue 4 32-country reportBCG Conference 3-4 JulyResources and publicationsAbout the Branded Content Governance Project
Towards duration robust weakly supervised sound event detection
Creators: name: Dinkel, Heinrich
name: Wu, Mengyue
name: Yu, Kai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Sound event detection (SED) is the task of tagging the absence or presence of audio events and their corresponding interval within a given audio clip. While SED can be done using supervised machine learning, where training data is fully labeled with access to per event timestamps and duration, our work focuses on weakly-supervised sound event detection (WSSED), where prior knowledge about an event's duration is unavailable. Recent research within the field focuses on improving segment- and event-level localization performance for specific datasets regarding specific evaluation metrics. Specifically, well-performing event-level localization requires fully labeled development subsets to obtain event duration estimates, which significantly benefits localization performance. Moreover, well-performing segment-level localization models output predictions at a coarse-scale (e.g., 1 second), hindering their deployment on datasets containing very short events (< 1 second). This work proposes a duration robust CRNN (CDur) framework, which aims to achieve competitive performance in terms of segment- and event-level localization. This paper proposes a new post-processing strategy named "Triple Threshold" and investigates two data augmentation methods along with a label smoothing method within the scope of WSSED. Evaluation of our model is done on the DCASE2017 and 2018 Task 4 datasets, and URBAN-SED. Our model outperforms other approaches on the DCASE2018 and URBAN-SED datasets without requiring prior duration knowledge. In particular, our model is capable of similar performance to strongly-labeled supervised models on the URBAN-SED dataset. Lastly, ablation experiments to reveal that without post-processing, our model's localization performance drop is significantly lower compared with other approaches.
MPEC 2024-T206 : 2024 TU6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TU6

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
ΔΕΙΧΤο Σύστημα Αποδελτίωσης Ιστοσελίδων
Creators: name: Ντονάς, Κωνσταντίνος Λεωνίδα
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Εξαγωγή περιεχομένου
Κανόνες εξαγωγής
Μοντέλο αντικειμένου εγγράφου
Content extraction
Extraction rules
Wrappers
DOM

description: Ο όγκος της μη δομημένης διαθέσιμης πληροφορίας στον Παγκόσμιο Ιστό είναι τεράστιος και μάλιστα αυξάνεται με γοργούς ρυθμούς. Ο εντοπισμός της επιθυμητής πληροφορίας, η εξαγωγή και η αποθήκευσή της σε δομημένη μορφή καθώς και η περαιτέρω αξιοποίησή της εμπεριέχουν πολλές δυσκολίες. Επιτακτική είναι η ανάγκη για περισσότερο αποτελεσματικές τεχνικές ανάκτησης των επιθυμητών δεδομένων. Ο τομέας της εξαγωγής περιεχομένου από ιστοσελίδες με αυτοματοποιημένο τρόπο, διαμέσου εξειδικευμένων προγραμμάτων, τους λεγόμενους wrappers, παρουσιάζει ιδιαίτερο ενδιαφέρον, τόσο για την επιστημονική κοινότητα, όσο και για τους απλούς χρήστες. Στο πλαίσιο τηε εργασίας, αναπτύχθηκε σύστημα εξαγωγής πληροφορίας από HTML ιστοσελίδες, το οποίο βασίζεται στο Μοντέλο Αντικειμένου Εγγράφου (DOM) και έχει να επιδείξει αρκετά προηγμένα χαρακτηριστικά και πολύ υψηλά επίπεδα ακρίβειας, τουλάχιστον για την πλειοψηφία των περιπτώσεων. Το εργαλείο, που έχει όνομα ΔΕiΧΤο, θέτει τις βάσεις για την αυτοματοποίηση εργασιών αποδελτίωσης στον ιστό και την κατασκευή πληθώρας νέων υπηρεσιών προστιθεμένης αξίας.
description: An enormous amount of data on the WEb is stille being encoded in HTML documents that are designed primarily for human consumption. Meanwhile, web pages are getting more complex in design and content and often conatian clutter that distraces a user from actual content. Web data can hardly be properly queried and manipulated as done for instance, in traditional databases. Consequently, it becomes essential to have automated means of extracting items of interest on a webpage. The traditional approach for extracting data from web sources is to write specialized programs, called wrappers, that identify data of interest and map them in a suitable format. This thesis proposes a software tool for building wrappers, called ΔΕiΧΤο. ΔΕiΧΤο is based on the Document Object Model (DOM) and its extraction results are very satisfactory for most cases. It can have many applications, such as performing everyday web tasks and gathering information.
Dark Matter in the Cosmos- Exploiting the Signatures of its Interaction with Nuclei
Creators: name: Vergados, J. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We review various issues related to the direct detection of constituents of dark matter, which are assumed to be Weakly Interacting Massive Particles (WIMPs). We specifically consider heavy WIMPs such as: 1) The lightest supersymmetric particle LSP or neutralino. 2) The lightest Kaluza-Klein particles in theories of extra dimensions and 3) other extensions of the standard model. In order to get the event rates one needs information about the structure of the nucleon as well as as the structure of the nucleus and the WIMP velocity distribution. These are also examined Since the expected event rates for detecting the recoiling nucleus are extremely low and the signal does not have a characteristic signature to discriminate them against background we consider some additional aspects of the WIMP nucleus interaction, such as the periodic behavior of the rates due to the motion of Earth (modulation effect). Since, unfortunately, this is characterized by a small amplitude we consider other options such as directional experiments, which measure not only the energy of the recoiling nuclei but their direction as well. In these, albeit hard, experiments one can exploit two very characteristic signatures: a)large asymmetries and b) interesting modulation patterns. Furthermore we extended our study to include evaluation of the rates for other than recoil searches such as: i) Transitions to excited states, ii) Detection of recoiling electrons produced during the neutralino-nucleus interaction and iii) Observation of hard X-rays following the de-excitation of the ionized atom.
description: 20 pages, 6 Figures; to appear in the Predeal 2006 Summer School in Nuclear Physics, Ed. A. Raduta
Behavioral decision-making for urban autonomous driving in the presence of pedestrians using Deep Recurrent Q-Network
Creators: name: Deshpande, Niranjan
name: Vaufreydaz, Dominique
name: Spalanzani, Anne
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Robotics (cs.RO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Decision making for autonomous driving in urban environments is challenging due to the complexity of the road structure and the uncertainty in the behavior of diverse road users. Traditional methods consist of manually designed rules as the driving policy, which require expert domain knowledge, are difficult to generalize and might give sub-optimal results as the environment gets complex. Whereas, using reinforcement learning, optimal driving policy could be learned and improved automatically through several interactions with the environment. However, current research in the field of reinforcement learning for autonomous driving is mainly focused on highway setup with little to no emphasis on urban environments. In this work, a deep reinforcement learning based decision-making approach for high-level driving behavior is proposed for urban environments in the presence of pedestrians. For this, the use of Deep Recurrent Q-Network (DRQN) is explored, a method combining state-of-the art Deep Q-Network (DQN) with a long term short term memory (LSTM) layer helping the agent gain a memory of the environment. A 3-D state representation is designed as the input combined with a well defined reward function to train the agent for learning an appropriate behavior policy in a real-world like urban simulator. The proposed method is evaluated for dense urban scenarios and compared with a rule-based approach and results show that the proposed DRQN based driving behavior decision maker outperforms the rule-based approach.
Fitting the luminosity data from type Ia supernovae in the frame of the Cosmic Defect theory
Creators: name: Tartaglia, A.
name: Capone, M.
name: Cardone, V.
name: Radicella, N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Cosmic Defect (CD) theory is reviewed and used to fit the data for the accelerated expansion of the universe, obtained from the apparent luminosity of 192 SnIa's. The fit from CD is compared with the one obtained by means of $Λ$CDM. The results from both theories are in good agreement and the fits are satisfactory. The correspondence between both approaches is discussed and interpreted.
description: 13 pages, 2 figures; Modified to improve the visibility of figures
On Periodic Dynamical Systems
Creators: name: Lu, wenlian
name: Chen, Tianping
Publisher: name: arXiv
Year: 2006
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 34K13,34K25,34K60

description: In this paper, we investigate the existence and the global stability of periodic solution for dynamical systems with periodic interconnections, inputs and self-inhibitions. The model is very general, the conditions are quite weak and the results obtained are universal.
Σύνθεση της 4-φωσφο-2-C-μεθυλο-D-ερυθριτόλης και των 1- και 2'-ισοτοπομερών της μητρικής ένωσης
Creators: name: Κωτούλας, Στέφανος Σωτηρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Ανεξάρτητη του μεβαλονικού οξέος βιοσυνθετική οδός
4-φωσφο-2-C-μεθυλο-D-ερυθριτόλη
Ολική σύνθεση φυσικών προϊόντων
Μονοπροστασία
Mevalonate-independent pathway
2-C-methyl-D-erythritol 4-phosphate
MEP
Total synthesis
Monoprotection

description: Στην παρούσα διπλωματική εργασία περιγράφεται μια σύνθεση της 4-φωσφο-2-C-μεθυλο-D-ερυθριτόλης σε εφτά ή εννέα στάδια και πρώτη ύλη την D-αραβινόζη.Σημαντικό ενδιάμεσο της σύνθεσης είναι το ακετονίδιο των υδροξυλίων 2 και 3 της 2-C-μεθυλο-D-ερυθριτόλης, καθώς μπορεί να οδηγήσει στην ελεύθερη μεθυλερυθριτόλη. Μεγάλης σημασίας είναι το στάδιο σύνθεσής του, το οποίο τροποποιημένο κατάλληλα μπορεί να οδηγήσει στο σχηματισμό του 1- ή/ και του 2'-δευτεριοπαραγώγων του.
description: A new synthetic approach toward 2-C-methyl-D-erythritol 4-phosphate (MEP), a key intermediate in the mevalonate-independent biosynethetic pathway for isoprenoids, and deuterated analogues of its precursor, 2-C-methyl-D-erythritol acetonide, is described. This procedure uses 2-C-hydrosymethyl-D-erythrose acetonide as starting material and delivers, through a mono-protection strategy, the target compounds in a short way and in high yield
Οι αντιλήψεις των δασκάλων του Δημοτικού Σχολείου για τα μαθήματα και τα επαγγέλματα των θετικών επιστημών και το φύλο
Creators: name: Θεοδωράκη, Αικατερίνη Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: subject: Φύλο
subject: θετικές επιστήμες
subject: Μαθηματικά
subject: Φυσική
subject: Επάγγελμα
subject: Αντιλήψεις δασκάλων
subject: Δημοτικό σχολείο
subject: Gender
subject: Science
subject: Mathematics
subject: FOS: Mathematics
subject: Physics
subject: Job
subject: Teacher's attitudes
subject: Elemetary school

description: Αντικείμενο της παρούσας εργασίας αποτελεί η προβληματική που έχει αναπτυχθεί γύρω από τα ζητήματα που αφορούν τις θετικές επιστήμες και το φύλο. Η προσέγγιση του θέματος επιχειρείται σε θεωρητικό και εμπειρικό επίπεδο. Στο θεωρητικό μέρος παρουσιάζονται οι κυριότερες προσεγγίσεις του θέματος "γυναίκα και θετικές επιστήμες" μέσα από τη δομή του πατριαρχικού και καπιταλιστικού συστήματος. Η υπο-αντιπροσώπευση των γυναικών σε επαγγέλματα όπως θετικές επιστήμες, τεχνολογία, μαθηματικά, σχετίζεται με την εκπαίδευση των δύο φύλων. Το εκπαιδευτικό σύστημα συντελεί στην αναπαραγωγή των στερεοτύπων φύλου και ο ρόλος του/της εκπαιδευτικού θεωρείται ιδιαίτερα σημαντικός. Η διεθνής βιβλιογραφία αναφέρει ότι οι αντιλήψεις των δασκάλων του δημοτικού σχολείου για τις επιδόσεις των δύο φύλων στα μαθηματικά διαφοροποιείται σε σχέση με το φύλο των παιδιών. Επιπλέον, τα δεδομένα των ερευνών δεν αιτιολογούν την άνιση συμμετοχή των γυναικών σε επαγγέλματα που σχετίζονται με τα μαθηματικά. Σύμφωνα με τα αποτελέσματα της έρευνας το στερεότυπο που τοποθετούσε τα μαθηματικά στην αντρική σφαίρα δεν έχει ανατραπεί. Δάσκαλοι/ες διαχωρίζουν τα επαγγέλματα σε ανδρικά και γυναικεία αντίληψη που ίσως οριοθετεί τα ενιδαφέροντα των παιδιών σε συγκεκριμένα γνωστικά αντικείμενα που αντιστοιχίζονται με τα δύο φύλα, αγόρια-μαθήματα θετικών επιστημών, κορίτσια-μαθήματα θεωρητικών επιστημών
description: The basic issue of this study refers to the relevant to science and women. As it has been mentioned and analysed by the feminists, throughout the structure patriarchate capitalistic system, the most crucial approaches of the topic "women and science" are presented in the imaginary part. The partial women's representation in branches like silence technology, mathematics is diversely related to the boys' and girls' education and mainly to the diversed importance of mathematics during the sexes' education. In the international bibliography is mentioned that the teachers' attitudes about boys' and girls' efficiency in maths are diversed accordingly to the children's sexes. The predominant stereotype during the last centuries wanted maths to be men's present to the greek teachers' sights. Businesses are seperated in male and female issues
In the Field 2 - Programme
Creators: name: Lane, Cathy
name: Carlyle, Angus
name: Peter Wright, Mark
name: Carr, Kate
Publisher: name: University of the Arts London
Year: 2024
Subjects: classificationCode: 369999
subject: Other creative arts and writing not elsewhere classified

description: In the Field 2
A three day event exploring the themes, issues and practices of contemporary field recordingDates: 4, 5, 6 July 2024.Venue: In person at London College of Communication, Elephant and Castle, London, SE1 6SB and onlineIn the Field 2 was an international conference exploring new perspectives in field recording practice and research. Over eighty international presenters contributed a diverse range of insights across peer reviewed presentations, workshops, sound and video works. Topics included acoustic witnessing, technology and ethics, critical fieldcraft, multi-sensory listening, memory, archives and more, forging unique and timely interventions into the changing methods, aesthetics and debates that infuse the field. The conference followed on from the international 2013 symposium of the same name, organised by CRiSAP (Creative Research in Sound Arts Practice), University of the Arts London in collaboration with the British Library. While the 2013 event mapped contemporary practices and their historical precedents, In the Field 2 investigated how the practice of field recording has changed in the intervening decade of escalating ecological, political, social and financial challenges.
Η διάχυση των τεχνολογιών Πληροφορικής και Επικοινωνιών (ΤΠΕ) στον τουρισμό και η αλληλεπίδραση με τους καταναλωτές: έρευνα για τη χρήση του διαδικτύου ως μέσο πραγματοποίησης τουριστικών δραστηριοτήτων
Creators: name: Σπορδίλη, Καλλιόπη Θεοδώρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: subject: Τεχνολογίες Πληροφορικής και Επικοινωνιών
subject: Ηλεκτρονικός Τουρισμός
subject: Συμπεριφορά καταναλωτή
subject: Διαδίκτυο
subject: Τουρισμός
subject: Information and Communications technologies
subject: E-tourism
subject: Consumer behavior
subject: Internet
subject: Tourism
subject: FOS: Economics and business

description: This thesis explores the relationship between the Information and Communications Technologies (ICTs) and Tourism, as a mean of interaction with the customers/consumers.The aim of the treatise is to record through research the attitude and behavior of Greek consumers with regard to the use of electronic means and, more specifically, the use of the internet, in order to organize and conduct their travels.In the ensuing pages is intended to examine the use of ICTs in the tourist sector and more specifically the dynamic co-relation existing between the internet and tourism; also is intended to examine the way in which the internet places a significant role in the rise of tourist demand and the way in which the internet helps boost tourist offers and services. The results deduced by this survey are distinguished into the three following categories; first, the frequency of use of the Internet for tourist products/services; secondly the satisfaction drawn from the products on offer as well as from the features of the internet; lastly the extent to which consumers prefer to use the Internet rather than any other traditional type of tourist services.
description: Στη διατριβή διερευνάται η σχέση μεταξύ των Τεχνολογιών Πληροφορικής και Επικοινωνιών (ΤΠΕ) και του τουρισμού, ως μέσο αλληλεπίδραης με τους πελάτες/καταναλωτές. Σκοπός είναι η καταγραφή μέσω έρευνας της στάσης και συμπεριφοράς των Ελλήνων καταναλωτών, όσον αφορά στη χρήση των ηλεκτρονικών μέσων και ιδιαίτερα του διαδικτύου για την πραγματοποίηση των τουριστικών και ταξιδιωτικών τους δραστηριοτήτων
Statistical Assessment of IP Multimedia Subsystem in a Softwarized Environment: a Queueing Networks Approach
Creators: name: Di Mauro, Mario
name: Liotta, Antonio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: The Next Generation 5G Networks can greatly benefit from the synergy between virtualization paradigms, such as the Network Function Virtualization (NFV), and service provisioning platforms such as the IP Multimedia Subsystem (IMS). The NFV concept is evolving towards a lightweight solution based on containers that, by contrast to classic virtual machines, do not carry a whole operating system and result in more efficient and scalable deployments. On the other hand, IMS has become an integral part of the 5G core network, for instance, to provide advanced services like Voice over LTE (VoLTE). In this paper we combine these virtualization and service provisioning concepts, deriving a containerized IMS infrastructure, dubbed cIMS, providing its assessment through statistical characterization and experimental measurements. Specifically, we: i) model cIMS through the queueing networks methodology to characterize the utilization of virtual resources under constrained conditions; ii) draw an extended version of the Pollaczek-Khinchin formula, which is useful to deal with bulk arrivals; iii) afford an optimization problem focused at maximizing the whole cIMS performance in the presence of capacity constraints, thus providing new means for the service provider to manage service level agreements (SLAs); $iv)$ evaluate a range of cIMS scenarios, considering different queuing disciplines including also multiple job classes. An experimental testbed based on the open source platform Clearwater has been deployed to derive some realistic values of key parameters (e.g. arrival and service times).
Σύνθετα υλικά. Πειραματική μελέτη βασικών χαρακτηριστικών θερμομονωτικών υλικών ευρείας χρήσης
Creators: name: Τσιχουρίδης, Χαρίλαος Αριστείδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Θερμομονωτικά υλικά
Θερμική αγωγιμότητα
Μηχανικές ιδιότητες
Σκληρότητα
Ελαστικότητα
Μέτρο Young
Thermal insulating materials
Thermal conductivity
Mechanical properties
Elasticity
Hardness
Young's modulus

description: Τα θερμομονωτικά υλικά χρησιμοποιούνται ευρέως σε όλες τις οικοδομικές και όχι μόνο κατασκευές και γίνεται μεγάλη προσπάθεια λόγω του έντονου ανταγωνισμού από πολλές εταιρίες η δημιουργία υλικών με ολοένα και περισσότερο βελτιούμενες ιδιότητες βασισμένες σε νανοδομές.Η εργασία αυτή περιλαμβάνει πέντε κεφάλαια:Στο πρώτο κεφάλαιο γίνεται αρχικά αναφορά στην περιγραφή της δομής καθώς και στον τρόπο παρασκευής του βασικού δομικού υλικού (πολυστυρένιο) των θερμομονωτικών υλικών. Κατόπιν ακολουθεί περιγραφή των ιδιοτήτων του και το ευρύ πεδίο των εφαρμογών στις οποίες συμμετέχει.Στο δεύτερο κεφάλαιο περιγράφονται τα εξωτερικά χαρακτηριστικά, οι τεχνικές ιδιότητες καθώς και οι εφαρμογές των μονωτικών υλικών που μελετήθηκαν με βάση τις πληροφορίες που αντλήθηκαν κυρίως από τα τεχνικά φυλλάδια των υλικών αλλά και από το διαδίκτυο.Στο τρίτο, τέταρτο κα πέμπτο κεφάλαιο γίνεται για κάθε μια ιδιότητα του θερμομονωτικού υλικού που μελετήθηκε, αρχικά μια θεωρητική ανάλυση και τρόπος υπολογισμού της τιμής της ιδιότητας, ακολουθεί η περιγραφή της αντίστοιχης κατασκευής της πρωτότυπης πειραματικής διάταξης καθώς και ο τρόπος λήψης των πειραματικών μετρήσεων και ακολουθεί η καταγραφή των πειραματικών μετρήσεων και κατόπιν η ανάλυσή τους προκειμένου να γίνει τελικά ο υπολογισμός των τιμών των ιδιοτήτων και η σύγκρισή τους με τις αντίστοιχες τιμές των τεχνικών φυλλαδίων.
description: The heat-insulating materials are widely used in all building constructions and not only.Because of a great competition between a variety of companies, there has been an effort to create materials which are based on improved properties and nanocostructures.The present dissertation includes five chapters:In the first chapter, there is reference on the description of the structure as well as on the preparation method of the basic constructing material (polysterene) and the heat-insulating materials. A description of its properties and the wide range of the applications it is used for follows.The second chapter refers to the external characteristics, the technical properties as well as the applications of the insulating materials which were studied based on the information drawn by relative leaflets by companies which produce them and by the internet.The third, fourth and fifth chapters begins with a theoretical analysis and an estimation method for each property of the heat-insulating material which was studied. They continue with a description of the relative construction of the original experimental structure as well as methods of receiving and recording experimental measurements followed by their analysis in order to estimate the properties and compare them with the corresponding ones which are included in the companies' leaflets.
Avant-propos
Creators: name: Hatzenberger, Antoine
Publisher: name: Classiques Garnier
Year: 2023
Subjects: subject: Philosophie
subject: Kant
subject: Éthique
subject: Phénoménologie
subject: Politique
subject: Esthétique
subject: Raison

description: Ce recueil d’études philosophiques s’origine dans l’enseignement reçu de Jean-Pierre Fussler, commentateur de l’œuvre kantien. Condisciples, anciens étudiants et collègues s’associent pour un travail collectif rendant compte de la diversité et de l’actualité des domaines et des régimes d’exercice de la raison critique, avec Kant, et après Kant.
Coherence Based Characterization of Macroscopic Quantumness
Creators: name: Naseri, Moein
name: Raeisi, Sadegh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: One of the most elusive problems in quantum mechanics is the transition between classical and quantum physics. This problem can be traced back to the Schrödinger's cat. A key element that lies at the center of this problem is the lack of a clear understanding and characterization of macroscopic quantum states. Our understanding of Macroscopic Quantumness relies on states such as the Greenberger-Horne-Zeilinger(GHZ) or the NOON state. Here we take a first principle approach to this problem. We start from coherence as the key quantity that captures the notion of quantumness and demand the quantumness to be collective and macroscopic. To this end, we introduce macroscopic coherence which is the coherence between macroscopically distinct quantum states. We construct a measure that quantifies how global and collective the coherence of the state is. Our work also provides a first-principle way to derive well-established states like the GHZ and the NOON state as the states that maximize our measure. This new approach paves the way towards a better understanding of the Quantum-to-Classical transition.
description: 5 pages, 2 figures
The Suprafroth (Superconducting Froth)
Creators: name: Prozorov, Ruslan
name: Fidler, Andrew F.
name: Hoberg, Jacob
name: Canfield, Paul C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The structure and dynamics of froths have been subjects of intense interest due to the desire to understand the behaviour of complex systems where topological intricacy prohibits exact evaluation of the ground state. The dynamics of a traditional froth involves drainage and drying in the cell boundaries, thus it is irreversible. We report a new member to the froths family: suprafroth, in which the cell boundaries are superconducting and the cell interior is normal phase. Despite very different microscopic origin, topological analysis of the structure of the suprafroth shows that statistical von Neumann and Lewis laws apply. Furthermore, for the first time in the analysis of froths there is a global measurable property, the magnetic moment, which can be directly related to the suprafroth structure. We propose that this suprafroth is a new, model system for the analysis of the complex physics of two-dimensional froths.
Atomic-scale control of graphene magnetism using hydrogen atoms
Creators: name: González-Herrero, H.
name: Gómez-Rodríguez, J. M.
name: Mallet, P.
name: Moaied, M.
name: Palacios, J. J.
name: Salgado, C.
name: Ugeda, M. M.
name: Veuillen, J. Y.
name: Yndurain, F.
name: Brihuega, I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Isolated hydrogen atoms absorbed on graphene are predicted to induce magnetic moments. Here we demonstrate that the adsorption of a single hydrogen atom on graphene induces a magnetic moment characterized by a ~20 meV spin-split state at the Fermi energy. Our scanning tunneling microscopy (STM) experiments, complemented by first-principles calculations, show that such a spin-polarized state is essentially localized on the carbon sublattice complementary to the one where the H atom is chemisorbed. This atomically modulated spin-texture, which extends several nanometers away from the H atom, drives the direct coupling between the magnetic moments at unusually long distances. Using the STM tip to manipulate H atoms with atomic precision, we demonstrate the possibility to tailor the magnetism of selected graphene regions.
A coupled electromagnetic-thermomechanical approach for the modeling of electric motors
Creators: name: Hanappier, N
name: Charkaluk, E
name: Triantafyllidis, N
Publisher: name: arXiv
Year: 2020
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Future developments of lighter, more compact and powerful motors-driven by environmental and sustainability considerations in the transportation industry-involve higher stresses, currents and electromagnetic fields. Strong couplings between mechanical, thermal and electromagnetic effects will consequently arise and a consistent multiphysics modeling approach is required for the motors' design. Typical simulations-the bulk of which are presented in the electrical engineering literature-involve a stepwise process, where the resolution of Maxwell's equations provides the Lorentz and magnetic forces which are subsequently used as the external body forces for the resolution of Newton's equations of motion. The work presented here proposes a multiphysics setting for the boundary value problem of electric motors. Using the direct approach of continuum mechanics, a general framework that couples the electromagnetic , thermal and mechanical fields is derived using the basic principles of thermodynamics. Particular attention is paid to the derivation of the coupled constitutive equations for isotropic materials under small strain but arbitrary magnetization. As a first application, the theory is employed for the analytical mod-eling of an idealized asynchronous motor for which we calculate the electric current, magnetic, stress and temperature fields as a function of the applied current and slip parameter. The different components of the stress tensor and body force vector are compared to their purely mechanical counterparts due to inertia, quantifying the significant influence of electromagnetic phenomena.
Η συνοδικότης της Εκκλησίας με βάση τα Πρακτικά των Οικουμενικών Συνόδων
Creators: name: Σαλμάς, Σταύρος (Αλέξανδρος) Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Σύνοδος
Συνοδικότητα
Οικουμενική Σύνοδος
Πρακτικά Οικουμενικών Συνόδων
Τοπικές σύνοδοι
Council/Synod
Conciliarity/Synodality
Ecumenical council/Synod
Minutes/acts
Local councils

description: Η παρούσα μελέτη, ερευνά τη συνοδικότητα έτσι όπως εκφράζεται στις Οικουμενικές Συνόδους. Μέσω της συνοδικότητας η Εκκλησία επιτυγχάνει την ενότητα και αποκρούει την αίρεση, διαφυλάττοντας την αποστολική παράδοση περί της Αποκάλυψης του Χριστού
description: This study examines conciliarity as it is expressed at the Ecumenical Councils. Through conciliarity the Church succeeds to find unity and fight the heretics, thus safegarding the apostolic tradition and the revelation of Christ
Penrose voting system and optimal quota
Creators: name: Slomczynski, Wojciech
name: Zyczkowski, Karol
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Systems of indirect voting based on the principle of qualified majority can be analysed using the methods of game theory. In particular, this applies to the voting system in the Council of the European Union, which was recently a subject of a vivid political discussion. The a priori voting power of a voter measures his potential influence over the decisions of the voting body under a given decision rule. We investigate a system based on the law of Penrose, in which each representative in the voting body receives the number of votes (the voting weight) proportional to the square root of the population he or she represents. Here we demonstrate that for a generic distribution of the population there exists an optimal quota for which the voting power of any state is proportional to its weight. The optimal quota is shown to decrease with the number of voting countries.
description: 12 pages, 2 figures
Bi-Hermitian gray surfaces II
Creators: name: Jelonek, Wlodzimierz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C15

description: The aim of this paper is to classify bi-Hermitian compact surfaces $(M,g)$ whose Ricci tensor $ρ$ satisfies the relation $\nabla_Xρ(X,X) =\frac13Xτg(X,X)$.
description: 17 pages
Exploring backward pion electroproduction in the scaling regime
Creators: name: Lansberg, J. P.
name: Pire, B.
name: Szymanowski, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We use general relations between the Transition Distribution Amplitudes (TDAs), entering the description of the p -> pi0 transition, and the proton Distribution Amplitudes (DAs) in the soft-pion limit to estimate the size of the amplitude for backward electroproduction of pi0 at large Q2.
description: Presented at the 7th International Conference on Quark Confinement and Hadron Spectrum (QCHS7), September 2-7 2006, Ponta Delgada, Portugal and at Soft-Pions in hard processes, August 3-5 2006, Regensburg, Germany, 4 pages, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty (included)
Μεταπραγματολογικές-μετακειμενικές ικανότητες και αναγνωστική κατανόηση στην πρώτη σχολική ηλικία
Creators: name: Πετράκη, Ζαχαρούλα Δημήτρη
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Αναγνωστική κατανόηση
Μεταπραγματολογική ενημερότητα
Μετακειμενική ενημερότητα
Μεταγνωστικές αναγνωστικές στρατηγικές
Πρώτη σχολική ηλικία
Reading comprehension
Metapragmatic awareness
Metatextual awareness
Metacognitive reading strategies
First and second grade

description: Η μειωμένη ικανότητα του αναγνώστη να λειτουργήσει σε μεταγνωστικό επίπεδο θεωρείται από τις σημαντικότερες αιτίες για τα προβλήματα αναγνωστικής κατανόησης. Παρόλο που τα προβλήματα αυτοί διαπιστώνονται στη μέση σχολική ηλικία, οι θεωρητικοί υποστηρίζουν ότι ξεκινούν νωρίτερα. Στην παρούσα έρευνα εξετάστηκε η συνεισφορά της μεταπραγματολικής και μετακειμενικής ενημερότητας στην αναγνωστική κατανόηση 40 μαθητών Α' και Β' Δημοτικού. Αξιολογήθηκαν οι μεταπραγματολογικές και μετακειμενικές τους ικανότητες, το επίπεδο αναγνωστικής κατανόησης, η ικανότητα αποκωδικοποίησης και η χρήση μεταγνωστικών αναγνωστικών στρατηγικών. Επίσης μελετήθηκε η επίδραση του μορφωτικού επιπέδου της οικογένειας στην ανάπτυξη της μεταπραγματολογικής-μετακειμενικής ενημερότητας. Τα αποτελέσματα έδειξαν ότι οι διαφορές στην αναγνωστική κατανόηση υπάρχουν από τα δύο πρώτα σχολικά έτη και συνδέονται με διαφορές στη μεταπραγματολογική-μετακειμενική ενημερότητα
description: One of the most significant causes of reading comprehension problems is the low reader's ability to operate at a metacognitive level. though these problems are recognized after the third grade theorists suggest that they start earlier. In our study we investigated whether the level of reading comprehension in first and second-graders is dependent on their metapragmatic-metatextual (MP-MT) awareness. We assessed the MP-MT abilities, the level of reading comprehension, the decoding skill and the use of metacognitive reading strategies of 40 first and second-graders. We also investigated the outcome of home literacy environment on the development of MP-MT awareness. The analysis of results revealed that reading comprehension differences exist from the beginning of school-life and that they are related with differences in MP-MT awareness