cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Αξιολόγηση όψεων της Δημιουργικής Μαθηματικής Σκέψης των μαθητών μέσω της Επίλυσης Προβλημάτων
Creators: name: Ασμίνη, Ελευθερία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αξιολόγηση Δημιουργικότητας
Δημιουργική Μαθηματική Σκέψη
Επίλυση Προβλήματος στο Δημοτικό Σχολείο
Evaluating Creativity
Creative Mathematical Thinking
Problem Solving in Primary School

description: Σκοπός της παρούσας έρευνας είναι η αξιολόγηση της Δημιουργικής Μαθηματικής Σκέψης (ΔΜΣ) των μαθητών του Δημοτικού Σχολείου. Σύμφωνα με τη βιβλιογραφία, η ΔΜΣ των μαθητών εξετάζεται υπό το πρίσμα των τεσσάρων γνωστικών πτυχών: ευχέρεια, ευελιξία, πρωτοτυπία και επεξεργασία. Ωστόσο, η παρούσα έρευνα υιοθετεί τη «Συνθετική προσέγγιση», η οποία λαμβάνει υπόψη πολλές επιμέρους συνιστώσες της ΔΜΣ και προσεγγίζει ξεχωριστά την κάθε μια από αυτές. Στα πλαίσια της έρευνας αναπτύχθηκε ένα τεστ, αποτελούμενο από πέντε ανοιχτά προβλήματα και ταυτόχρονα τροποποιήθηκε μια σχάρα αξιολόγησης της ΔΜΣ που αρχικά χρησιμοποιήθηκε στα πλαίσια ενός σχετικού ευρωπαϊκού έργου. Η έρευνα αξιολογεί τη ΔΜΣ 20 μαθητών της Στ΄ Δημοτικού, μέσα από μια «συνθετική προσέγγιση» που λαμβάνει υπόψη ταυτόχρονα τόσο τις επιμέρους συνιστώσες όσο και τις τέσσερις βασικές γνωστικές πτυχές της ΔΜΣ των μαθητών, αναδεικνύοντας τις πολλές, διαφορετικές, πρωτότυπες και επεξεργασμένες απαντήσεις τους. Τα αποτελέσματα αυτά εγείρουν σημαντικές εκπαιδευτικές προεκτάσεις και αναδεικνύουν την αναγκαιότητα για ανάπτυξη παρόμοιων εργαλείων αξιολόγησης, τα οποία θα προσεγγίζουν ολιστικά τη ΔΜΣ των μαθητών.
description: The aim of this research is to evaluate primary school students’ Creative Mathematical Thinking (CMT). According to the literature, students' CMT is examined in the light of the four cognitive aspects: fluency, flexibility, originality and elaboration. However, the current study adopts the "Componential Approach", that takes account of many partial aspects of CMT and examines each one separately. A collection of five open-ended tasks was developed accompanied with an evaluation grid which is a modified version of the grid used in the context of a European project aiming to evaluate CMT. This synthetic approach is used to evaluate the CMT of 20 grade-6 students in a public elementary school and the findings highlight their many, different, original and elaborated responses through the lenses of the four main cognitive aspects of CMT. These findings raise significant educational implications and highlight the need for development of similar assessment tools that will approach holistically the students’ CMT.
First tentative detection of anisotropy in the QSO distribution around nearby edge-on spiral galaxies
Creators: name: Lopez-Corredoira, M.
name: Gutierrez, C. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: AIMS. To check whether the polar angle distribution of QSOs around nearby spiral galaxies is isotropic or not. METHODS. A statistical analysis of the polar angle distribution of large samples of QSOs from the SDSS survey and Monte Carlo simulations to calculate their significance are carried out. RESULTS. There is a clear excess of QSOs near the minor axis with respect to the major axis of nearby edge-on spiral galaxies, significant at a level 3.5-sigma up to angular distances of 3 deg. (or ~1.7 Mpc) from the centre of each galaxy. The significance is increased to 3.9-sigma with the z>0.5 QSOs, and it reaches 4.8-sigma if we include galaxies whose circles of radius 3 degrees are covered by the SDSS in more than 98% (instead of 100%) of the area. CONCLUSIONS. Gravitational lensing in the halo of nearby galaxies or extinction seem insufficient to explain the observed anisotropic distribution of QSOs. The anisotropic distribution agrees qualitatively with the predictions of Arp's models, which claim that QSOs are ejected by galaxies along the rotation axis, although Arp's prediction give a distance of the QSOs ~3 times smaller than that found here. In any case, a chance fluctuation, although highly improbable, might be a possibility rather than a true anisotropy, and the present results should be corroborated by other groups and samples, so we prefer to consider it as just a first tentative detection.
description: 16 pages, accepted to be published in A&A
Structured Prediction for CRiSP Inverse Kinematics Learning with Misspecified Robot Models
Creators: name: Marconi, Gian Maria
name: Camoriano, Raffaello
name: Rosasco, Lorenzo
name: Ciliberto, Carlo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: G.3; I.5.1; I.5.4

description: With the recent advances in machine learning, problems that traditionally would require accurate modeling to be solved analytically can now be successfully approached with data-driven strategies. Among these, computing the inverse kinematics of a redundant robot arm poses a significant challenge due to the non-linear structure of the robot, the hard joint constraints and the non-invertible kinematics map. Moreover, most learning algorithms consider a completely data-driven approach, while often useful information on the structure of the robot is available and should be positively exploited. In this work, we present a simple, yet effective, approach for learning the inverse kinematics. We introduce a structured prediction algorithm that combines a data-driven strategy with the model provided by a forward kinematics function -- even when this function is misspecified -- to accurately solve the problem. The proposed approach ensures that predicted joint configurations are well within the robot's constraints. We also provide statistical guarantees on the generalization properties of our estimator as well as an empirical evaluation of its performance on trajectory reconstruction tasks.
description: Accepted for publication in IEEE Robotics and Automation Letters (2021) and presentation at IEEE International Conference on Robotics and Automation (2021) Updated funding information
Στρατηγικές παιδιών και ενηλίκων στην εκτέλεση νοερών υπολογισμών διαίρεσης
Creators: name: Κούτλα, Αθανασία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Στρατηγικές
Νοεροί υπολογισμοί
Διαίρεση
Strategies
Mental computation
Division

description: Σκοπός της παρούσας εργασίας ήταν η μελέτη της επίδοσης και των στρατηγικών που χρησιμοποιούν μαθητές και ενήλικες κατά την εκτέλεση νοερών υπολογισμών διαίρεσης. Στην έρευνα που διεξήχθη συμμετείχαν 50 μαθητές Στˊ δημοτικού και 50 ενήλικες, από τους οποίους ζητήθηκε να απαντήσουν σε 16 δοκιμασίες διαίρεσης. Οι μισές από αυτές ήταν μικρής και οι άλλες μισές μεγαλύτερης γνωστικής απαίτησης. Επίσης, οι μισές δοκιμασίες παρουσιάστηκαν με πλαίσιο, ενώ οι άλλες μισές χωρίς αναφορά σε συγκεκριμένο πλαίσιο. Οι συμμετέχοντες χωρίστηκαν τυχαία σε δύο ομάδες ως προς τη γραπτή ή προφορική παρουσίαση των δοκιμασιών. Από τα αποτελέσματα φάνηκε ότι η επίδοση των μαθητών της Στˊ τάξης ήταν μέτρια, ενώ των ενηλίκων πολύ καλή. Οι συμμετέχοντες είχαν καλύτερη επίδοση στις δοκιμασίες με πλαίσιο και στις λιγότερο γνωστικά απαιτητικές δοκιμασίες. Για την εκτέλεση των υπολογισμών χρησιμοποιήθηκε ένα εύρος στρατηγικών με πιο συχνές τις στρατηγικές του αλγορίθμου, της άμεσης ανάκλησης και της διαφορετικής πράξης για χτίσιμο του διαιρετέου. Τέλος, ενώ οι ενήλικες αξιοποίησαν μια ποικιλία στρατηγικών, περίπου ένας στους δύο μαθητές Στˊ τάξης κατέφυγε στον τυπικό αλγόριθμο
description: The aim of the present study was to examine the performance and strategies used by students and adults, when performing mental division computations. Fifty (50) sixth grade students and fifty (50) adults were asked to answer sixteen division tasks. The tasks were equally divided into those requiring lower and higher cognitive demands. Half of the tasks were also presented in a realistic context, whereas the other half were presented without a specific context. Participants were randomly distributed to two groups, regarding the written or oral presentation of the tasks. Results showed that the sixth-graders’ performance was moderate, whereas the performance of the adults was very good. All participants performed significantly better on tasks presented within a context and on less cognitive demanding tasks. A range of strategies was found among of which the most frequently used were the algorithm strategy, the recall strategy and the different operation for “building” the dividend. Quite interestingly, adults were found to use a variety of strategies, whereas one out of two sixth-graders applied the long division standard algorithm
Optical Evidence for Mixed Phase Behavior in Manganites
Creators: name: Gao, P.
name: Tyson, T. A.
name: Liu, Z.
name: DeLeon, M. A.
name: Dubourdieu, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Synchrotron infrared measurements were conducted over the range 100 to 8000 cm-1 on a self-doped LaxMnO3-d (x~~0.8) film. From these measurements we determined the conductivity, the effective number of free carriers, and the specific phonon modes as a function of frequency. While the metal-insulator transition temperature (TMI) and the magnetic ordering temperature (TC) approximately coincide, the free carrier density onset occurs at a significantly lower temperature (~~45 K below). This suggests that local distortions exist below TMI and TC which trap the eg conduction electrons. These regions with local distortions constitute an insulating phase which persists for temperatures significantly below TMI and TC. The initial large drop in resistivity is due to the enhanced magnetic ordering while further drops correspond to reductions in the insulating phase which increase the number of free carriers.
description: 12 pages, 5 figures
P-wave contacts of quantum gases in quasi-one-dimensional and quasi-two-dimensional traps
Creators: name: He, Mingyuan
name: Zhou, Qi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The length scale separation in dilute quantum gases in quasi-one-dimensional or quasi-two-dimensional traps has spatially divided the system into two distinct regimes. Whereas universal relations defined in strict one or two dimensions apply in a scale that is much larger than the characteristic length of the transverse confinements, physical observables in the short distances are inevitably governed by three-dimensional contacts. Here, we show that p-wave contacts defined in different length scales are intrinsically connected by a universal relation, which depends on a simple geometric factor of the transverse confinements. While this universal relation is derived for one of the p-wave contacts, it establishes a concrete example of how dimensional crossover interplays with contacts and universal relations for arbitrary partial wave scatterings.
description: 9 pages, 3 figures. A following up work for arXiv:1708.00135. Accepted by PRA
Digitale Dienste für die Wissenschaft - wohin geht die Reise?
Creators: name: Konrad, Uwe
name: Förstner, Konrad
name: Reetz, Johannes
name: Wannemacher, Klaus
name: Kett, Jürgen
name: Mannseicher, Florian
Publisher: name: Zenodo
Year: 2020
Subjects: Digitale Dienste
Allianz der deutschen Wissenschaftsorganisationen
Research Software
Open Science
Digital Transformation
Open Source
Information Technology

description: Aufgrund des informationstechnologischen Fortschritts, der immer stärkeren, domänenübergreifenden Vernetzung in Wissenschaft und Forschung sowie der Notwendigkeit, gemeinsam Dienste und Ressourcen zu nutzen, werden von den Akteuren in Forschung und Wissenschaft zunehmend verteilte digitale Dienste verwendet. Der Fokus dieser Handreichung liegt auf den wissenschaftlichen Informationsdiensten, zu denen man u. a. Werkzeuge für kollaboratives Arbeiten, für die Aufbereitung und Analyse von Daten sowie Dienste zum wissenschaftlichen Publizieren, aber auch Dienste für die Entwicklung von Forschungssoftware zählen kann. Dabei zielen die Fragen nach der Art der geforderten bzw. wirklich verwendeten Diensten, der Vor- und Nachteile der gegenwärtigen Nutzung sowie der eigenverantwortlichen Bereitstellung dieser Dienste unter dem Aspekt der (finanziellen) Ressourcen-
 Effizienz.
Angular momentum dependent friction slows down rotational relaxation under non-equilibrium conditions
Creators: name: Gelin, M. F.
name: Kosov, D. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It has recently been shown that relaxation of the rotational energy of hot non-equlibrium photofragments (i) slows down significantly with the increase of their initial rotational temperature and (ii) differs dramatically from the relaxation of the equilibrium rotational energy correlation function, manifesting thereby breakdown of the linear response description [Science 311, 1907 (2006)]. We demonstrate that this phenomenon may be caused by the angular momentum dependence of rotational friction. We have developed the generalized Fokker-Planck equation whose rotational friction depends upon angular momentum algebraically. The calculated rotational correlation functions correspond well to their counterparts obtained via molecular dynamics simulations in a broad range of initial non-equilibrium conditions. It is suggested that the angular momentum dependence of friction should be taken into account while describing rotational relaxation far from equilibrium.
Quantum Entanglement dependence on bifurcations and scars in non autonomous systems. The case of Quantum Kicked Top
Creators: name: Stamatiou, George
name: Ghikas, Demetris P. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Properties related to entanglement in quantum systems, are known to be associated with distinct properties of the corresponding classical systems, as for example stability, integrability and chaos. This means that the detailed topology, both local and global, of the classical phase space may reveal, or influence, the entangling power of the quantum system. As it has been shown in the literature, the bifurcation points, in autonomous dynamical systems, play a crucial role for the onset of entanglement. Similarly, the existence of scars among the quantum states seems to be a factor in the dynamics of entanglement. Here we study these issues for a non-autonomous system, the Quantum Kicked Top, as a collective model of a multi-qubit system. Using the bifurcation diagram of the corresponding classical limit (the Classical Kicked Top), we analyzed the pair-wise and the bi-partite entanglement of the qubits and their relation to scars, as a function of the critical parameter of the system. We found that the pair-wise entanglement and pair-wise negativity show a strong maximum precisely at the bifurcation points, while the bi-partite entanglement changes slope at these points. We have also investigated the connection between entanglement and the fixed points on the branch of the bifurcation diagram between the two first bifurcation points and we found that the entanglement measures take their extreme values precisely on these points. We conjecture that our results on this behaviour of entanglement is generic for many quantum systems with a non-linear classical analogue.
description: 14 pages, 6 figures in separate ps files, submitted for publication
Insights on associations between the frequency of use of diverse social media products and social networks use disorder tendencies from a German speaking sample
Creators: name: Montag, Christian
name: Wegmann, Elisa
name: Schmidt, Lasse David
name: Klein, Lena
name: Rozgonjuk, Dmitri
name: Rumpf, Hans-Jürgen
Publisher: name: Universität Ulm
Year: 2024
Subjects: subject: Social media addiction
subject: TikTok
subject: Facebook
subject: Instagram
subject: WhatsApp
subject: DDC 150 / Psychology

description: Objective In the present work we investigate how individual differences in at least occasionally using distinct social media platforms is linked to social networks use disorder (SNUD) tendencies. A final sample of n  = 2200 participants filled in the AICA-C-9 measure to get insights into individual differences in overuse of social media and participants also indicated which platforms they used at least once a month. Results The analysis revealed a robust positive association between number of at least occasionally used social media apps and SNUD tendencies ( r  = .44, p  < .001). Further, platforms differed in terms of their “addictive potential”, if one takes associations between frequency of distinct platforms use and SNUD tendencies as a proxy for this (and of course the actual descriptive statistics of the SNUD scale for the (non-)frequent user groups of the different platforms). In this regard, at least occasionally using some platforms (here Tumblr, Twitter and TikTok) was associated with highest SNUD tendencies. Moreover, largest differences in terms of effect sizes between the occasional and non-occasional user groups regarding SNUD scores could be observed for Instagram, WhatsApp, and TikTok. The present work bases on data from a larger project investigating associations between SNUD and tobacco use disorder.
Purely transmitting integrable defects
Creators: name: Corrigan, E
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Some aspects of integrable field theories possessing purely transmitting defects are described. The main example is the sine-Gordon model and several striking features of a classical field theory containing one or more defects are pointed out. Similar features appearing in the associated quantum field theory are also reviewed briefly.
description: 6 pages, to appear in Proceedings of the XVth International Colloquium on Integrable Systems and Quantum Symmetries, Prague, June 2006
Traumatic events and posttraumatic stress symptoms in a treatment-seeking sample of Ukrainian children during the war
Creators: name: Pfeiffer, Elisa
name: Garbade, Maike
name: Sachser, Cedric
Publisher: name: Universität Ulm
Year: 2024
Subjects: subject: Trauma
subject: Children
subject: PTSD
subject: Ukraine
subject: War
subject: DDC 150 / Psychology

description: AbstractBackgroundThe Russian invasion of Ukraine resulted in a dramatic increase of children and adolescents being confronted with war and other traumatic experiences, which could result in an increase of trauma-related mental health disorders such as posttraumatic stress disorder (PTSD) in an entire generation. This study aims at reporting the prevalence of traumatic events, PTSD, and Complex PTSD (CPTSD) in children and adolescents seeking for mental health treatment since the Russian invasion. Additionally, the consistency of child and caregiver reported trauma, PTSD and CPTSD will be examined.MethodsThis study is part of the “TF-CBT Ukraine” project in which Ukrainian therapists were trained in assessing their patients via the “Child and Adolescent Trauma Screen” (CATS-2) before initiating trauma-focused treatment, if indicated. Altogether N = 200 Ukrainian children and adolescents (Mage = 12.01, range 4–21; 62.0% female) were included in the study between October 2022 and August 2023. Data were analysed descriptively, via t-tests and bivariate correlations.ResultsThe children and adolescents reported on average four different traumatic events, most frequently war (n = 123; 68.7%), bullying threats (n = 71; 39.7%) and domestic violence (n = 68; 38.0%). Almost 70% (n = 123) of the participants fulfilled the DSM-5 PTSD criteria, 31% (n = 56) fulfilled the ICD-11 PTSD criteria and 21% (n = 38) the ICD-11 CPTSD criteria. Rates of PTSD were even higher in preschool children (95%). The comparisons of self-and caregiver reports on traumatic events and PTSD/CPTSD severity scores indicated moderate to high correlations between the patients and their caregivers (r = 0.710–0.767).ConclusionsThis study shows that Ukrainian children and adolescents starting treatment report a high number of traumatic events and trauma-related symptoms, which could have a long-lasting negative impact on their social-emotional development and quality of life. The implementation of evidence-based trauma-focused interventions for these children is therefore crucial.
The representation of asylum seekers in L'obs and Valeurs Actuelles between 2016 and 2017
Creators: name: Ferrara, Jonathan Serge
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πρόσφυγες
Εθνικισμός
Αντιπροσώπευση μέσων
Refugees
Nationalism
Media representation

description: Η παρούσα διπλωματική εργασία είναι μια μεικτή ανάλυση της κάλυψης των μέσων ενημέρωσης από την κρίση των προσφύγων μεταξύ της online έκδοσης L'Obs και Valeurs Actuelles, δύο περιοδικά ειδήσεων που αποτελούν αντίστοιχα μέρος της αριστεράς και δεξιάς πλευράς των γαλλικών μέσων ενημέρωσης και του πολιτικού τοπίου. Πραγματοποιήθηκε μια συγκριτική ανάλυση περιεχομένου και μια ανάλυση πολυτροπικών κρίσιμων ομιλιών (MCDA) προκειμένου να καταστεί δυνατή η μακροοικονομική και μικροδιαγνωστική κατανόηση της κρίσης των προσφύγων (η λειτουργικοποίηση αυτών των δύο μεθόδων μπορεί να βρεθεί στο τμήμα μεθοδολογίας μας)
description: This thesis is a mixed method analysis of the media coverage of the refugee crisis between the online version of L'Obs and Valeurs Actuelles, two news magazines that are respectively part of the left and right wing of the French media and political landscape. A content comparative analysis and a multi-modal critical discourse analysis (MCDA) were carried out in order to provide a macro and micro understanding of the refugee crisis (the operationalisation of these two methods can be found in our methodology part)
Population Control Bias and Importance Sampling in Full Configuration Interaction Quantum Monte Carlo
Creators: name: Ghanem, Khaldoon
name: Liebermann, Niklas
name: Alavi, Ali
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Population control is an essential component of any projector Monte Carlo algorithm. This control mechanism usually introduces a bias in the sampled quantities that is inversely proportional to the population size. In this paper, we investigate the population control bias in the full configuration interaction quantum Monte Carlo method. We identify the precise origin of this bias and quantify it in general. We show that it has different effects on different estimators and that the shift estimator is particularly susceptible. We derive a re-weighting technique, similar to the one used in diffusion Monte Carlo, for correcting this bias and apply it to the shift estimator. We also show that by using importance sampling, the bias can be reduced substantially. We demonstrate the necessity and the effectiveness of applying these techniques for sign-problem-free systems where this bias is especially notable. Specifically, we show results for large one-dimensional Hubbard models and the two-dimensional Heisenberg model, where corrected FCIQMC results are comparable to the other high-accuracy results.
description: 8 pages, LaTeX; references and a note added
Shifting ground: finding a feminist research voice through an evaluation of an ESL curriculum
Creators: name: Mackie, Ardiss Emilie
Publisher: name: University of British Columbia
Year: 2009

description: This study addresses the problem of evaluating one's own work, in this case a task-based ESL (English as a Second Language) for Business curriculum, using a participatory model of evaluation. Participatory evaluation allows for the traditional roles of researcher and researched to be reversed if participants so choose. The study also focusses on the process of change in researcher perspective towards feminist research themes that I experienced, and the link between these themes and the evaluation study. The participants in the evaluation study included 11 adult ESL students, their ESL instructor and Business professor, their course advisor, and myself. In the evaluation study, student and staff participation preferences resulted in traditional forms of data collection, namely questionnaire, interview, and discussion. An analysis of these uncovered specific issues related to the ESL for Business Curriculum such as student and staff difficulties in working with a new program. Also emerging from the student and staff data were findings related to the discrepancy between task-based curricula and the real life tasks of studying in content courses: students preferred teacher-fronted instruction in the ESL support course which was also the type of instruction in the Marketing course. My reflections on participation in this model of evaluation revealed powerful, personal connections to the evaluation process. Alternative sources data in the form of creative texts (poetry and autobiography) were included to express the personal dimension of the study. The study weaves themes such as vulnerability, living within the hierarchy, contradiction, and the power of the personal with the shift from a traditional research perspective to an alternative one embracing feminist principles.
Absolutely entangled sets of pure states for bipartitions and multipartitions
Creators: name: Yu, Baichu
name: Jayachandran, Pooja
name: Burchardt, Adam
name: Cai, Yu
name: Brunner, Nicolas
name: Scarani, Valerio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A set of quantum states is said to be absolutely entangled, when at least one state in the set remains entangled for any definition of subsystems, i.e. for any choice of the global reference frame. In this work we investigate the properties of absolutey entangled sets (AES) of pure quantum states. For the case of a two-qubit system, we present a sufficient condition to detect an AES, and use it to construct families of $N$ states such that $N-3$ (the maximal possible number) remain entangled for any definition of subsystems. For a general bipartition $d=d_1d_2$, we prove that sets of $N>\left\lfloor{(d_{1}+1)(d_{2}+1)/2}\right \rfloor$ states are AES with Haar measure 1. Then, we define AES for multipartitions. We derive a general lower bound on the number of states in an AES for a given multipartition, and also construct explicit examples. In particular, we exhibit an AES with respect to any possible multi-partitioning of the total system.
description: 11 pages, 2 figures
Το γυναικείο κόσμημα στην ευρωπαϊκή ζωγραφική του 19ου αιώνα
Creators: name: Σάρρη, Ευσταθία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Γυναικείο κόσμημα
Ευρωπαϊκή ζωγραφική
19ος αιώνας
Women jewellery
European painting
19th century

description: Η παρούσα εργασία εξετάζει τα κοσμήματα που απεικονίζονται σε γυναικείες προσωπογραφίες στη ζωγραφική του 19ου αιώνα. Στην εισαγωγή αναφέρεται ο ορισμός και η λειτουργία του κοσμήματος, μία συνοπτική ιστορική αναδρομή και το κόσμημα ως ένδειξη πλούτου και εξουσίας. Επίσης, παρουσιάζονται τα είδη και η σημασία των γυναικείων κοσμημάτων του 19ου αιώνα, τα υλικά και οι τεχνικές τους. Στη συνέχεια, το περιεχόμενο οργανώθηκε αρχικά με βάση τα χαρακτηριστικά των κοσμημάτων και κατόπιν με βάση τα ρεύματα ζωγραφικής. Έτσι, στο πρώτο κεφάλαιο, εξετάζονται νεοκλασικά και ρομαντικά κοσμήματα σε νεοκλασικά, ρομαντικά, συμβολιστικά, έργα προραφαηλιτών ζωγράφων και εμπρεσιονιστικά έργα της ευρωπαϊκής ζωγραφικής. Στο δεύτερο κεφάλαιο μελετώνται τα κοσμήματα που παρουσιάζονται σε ελληνικές γυναικείες προσωπογραφίες του 19ου αιώνα, με μία σύντομη παρουσίαση των ειδών των κοσμημάτων της αντίστοιχης περιόδου στον ελληνικό χώρο. Στα δύο κεφάλαια επισημαίνεται ότι τα καλλιτεχνικά ρεύματα του 19ου αιώνα, μέσα από τις γυναικείες προσωπογραφίες, προσέγγισαν τα γυναικεία κοσμήματα με αντίστοιχα τεχνοτροπικά χαρακτηριστικά και ανέδειξαν τον σημαντικό ρόλο τους στην τέχνη. Επίσης, ανιχνεύεται ο λόγος απεικόνισης των κοσμημάτων και τα μηνύματα που εξέπεμπαν στον θεατή καθώς και τα αίτια που οδήγησαν ορισμένα ρεύματα τέχνης να απεικονίζουν πλήθος κοσμημάτων ενώ άλλα να εμφανίζουν ελάχιστα.
description: The present thesis examines jewellery depicted in female portraits of the European paintings of the 19th-century. The introduction refers to the definition and function of the jewellery, a brief historical overview and jewels as an indication of wealth and power. It also presents the genres and the importance of 19th century women's jewels, their materials and techniques. Subsequently, the content was initially organized on the basis of the jewellery characteristics and then on the basis of the painting streams. Thus, in the first chapter, neoclassical and romantic jewellery is examined in neoclassical, romantic, symbolic, works of pre-raphaelite painters and impressionistic works of European painting. In the second chapter the jewellery presented in 19th century Greek female portraits, with a brief presentation of the jewels of the respective period in the Greek space, is studied. In the two chapters it is pointed out that 19th-century artistic trends, through female portraits, approached women's jewels with corresponding stylistic features and showed their important role in art. Moreover, the reasons for displaying the jewellery and the messages sent to the viewer were detected, as well as the reasons that led certain art streams to depict a plurality of jewels while others showed few.
Phase behaviour of a symmetrical binary fluid mixture
Creators: name: Koefinger, Juergen
name: Wilding, Nigel B.
name: Kahl, Gerhard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have investigated the phase behaviour of a symmetrical binary fluid mixture for the situation where the chemical potentials $μ_1$ and $μ_2$ of the two species differ. Attention is focused on the set of interparticle interaction strengths for which, when $μ_1=μ_2$, the phase diagram exhibits both a liquid-vapor critical point and a tricritical point. The corresponding phase behaviour for the case $μ_1\neμ_2$ is investigated via integral-equation theory calculations within the mean spherical approximation (MSA), and grand canonical Monte Carlo (GCMC) simulations. We find that two possible subtypes of phase behaviour can occur, these being distinguished by the relationship between the critical lines in the full phase diagram in the space of temperature, density, and concentration. We present the detailed form of the phase diagram for both subtypes and compare with the results from GCMC simulations, finding good overall agreement. The scenario via which one subtype evolves into the other, is also studied, revealing interesting features.
description: 22 pages, 13 figures
Βιοκλιματικό κτίριο γραφείων & αειφόρος αστική ανάπλαση του ευρύτερου περιβάλλοντος στη Ν.Κρήνη Θεσσαλονίκης
Creators: name: Καρακινάρης, Γεώργιος Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Βιοκλιματικό
Κτίριο Γραφείων
Ανάπλαση
Environmental
Office Building
Regeneration

description: Σκοπός της μεταπτυχιακής εργασίας είναι η προστασία, αποκατάσταση και ανάδειξη του τοπίου σε απαλλοτριωμένο οικόπεδο της Νέας Κρήνης Θεσσαλονίκης για τη δημιουργία ενός λειτουργικού και αρμονικού συνόλου. Κατόπιν αντιληπτικής διερεύνησης, παρατηρήθηκε απουσία ενιαίου σχεδιαστικού πνεύματος με άμεση συνέπεια τον κατακερματισμό του τοπίου. Η περιοχή αναδεικνύεται με το σχεδιασμό ενός εξαώροφου βιοκλιματικού δημόσιου κτιρίου γραφείων, το οποίο πλαισιώνεται από μία διώροφη ζώνη καταστημάτων αθλητικής ένδυσης και δύο ισόγειους χώρους εστίασης. Για την κατασκευή του κτιρίου γραφείων έχουν προβλεφθεί οι κατάλληλες αρχές και τεχνολογίες ώστε να λειτουργεί ως αποθήκη και παγίδα θερμότητας, ως φυσικός ηλιακός συλλέκτης το χειμώνα, να αποθηκεύει το καλοκαίρι φυσική ψύξη και να εξασφαλίζει άπλετο φυσικό φωτισμό. Ο σωστός προσανατολισμός του, η εκμετάλλευση των κλιματικών συνθηκών, η διαμόρφωση του μικροκλίματος και η απρόσκοπτη θέα στο φυσικό περιβάλλον αποτελούν παράγοντες ελαχιστοποίησης της ενεργειακής του κατανάλωσης και επίτευξης άνεσης για τους εργαζόμενους και τους επισκέπτες.
description: The aim of thesis is the protection, rehabilitation and enhancement of landscape in an expropriated plot in Nea Krini Thessaloniki for the creation of a functional and harmonic whole. As a result of a perceptual analysis, I have noticed the absence of a united design spirit, resulting the landscape fragmentation. The area is being promoted by a sustainable six-story public office building, which is framed by a double deck zone of sports shops and two bar-restaurants in the ground level. The office building is designed with the suitable principles and technologies that make it work as a storage-heat trap, natural solar collector in winter and save natural cooling in summer. It also ensures plenty of natural lighting. The right orientation, the holding of climate conditions, the microclimate design and the unobstructed view to natural environment contribute to low energy consumption and comfort for employees and visitors.
An interview with Agnès Henri, Managing Director, EDP Sciences
Creators: name: SPARC Europe
Publisher: name: Zenodo
Year: 2020
Subjects: infrastructure, publishing, open access, sustainability, funding

description: This is one of a series of interviews to share insights into the sustainability of open infrastructure services. These interviews were conducted in the Spring/Summer of 2020. This is an Invest in Open Infrastructure Project: https://investinopen.org. This work is supported by Open Society Foundations and SPARC Europe, in collaboration with Invest in Open Infrastructure. For more on this work see https://sparceurope.org/ioiinterviews
title: Cahiers de lexicologie. 2015-1, n° 106
title: Diasystème et variation en français actuel : aspects sémantiques
titleType: Subtitle
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2015
Subjects: subject: Variation sémantique et morphosyntaxique
subject: Dictionnaires
subject: Français québécois
subject: Lexicographie québécoise
subject: Synonymie
subject: Anglicisme
subject: Gros mots
subject: Néologisme
subject: Langage journalistique
subject: Marqueurs discursifs

description: Contributeurs : Catherine Collin, Bruno Courbon, Liesbeth Degand, Gaétane Dostie, Pascaline Faure, Pascale Hadermann, John Humbley, Zhichao Jia, Marie-Claude L'Homme, Estelle Moline, Claude Poirier, Nathalie Rossi-Gensane, Deniz Uygur-Distexhe et Stéphane Viellard.
$\bar K$-Nuclear Deeply Bound States?
Creators: name: Gal, Avraham
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Following the prediction by Akaishi and Yamazaki of relatively narrow $\bar K$-nuclear states, deeply bound by over 100 MeV where the main decay channel $\bar K N \to πΣ$ is closed, several experimental signals in stopped $K^-$ reactions on light nuclei have been interpreted recently as due to such states. In this talk I review (i) the evidence from $K^-$-atom data for a {\it deep} $\bar K$-nucleus potential, as attractive as $V_{\bar K}(ρ_0) \sim -(150 - 200)$ MeV at nuclear matter density, that could support such states; and (ii) the theoretical arguments for a {\it shallow} potential, $V_{\bar K}(ρ_0) \sim -(40 - 60)$ MeV. I then review a recent work by Mareš, Friedman and Gal in which $\bar K$-nuclear bound states are generated dynamically across the periodic table, using a RMF Lagrangian that couples the $\bar K$ to the scalar and vector meson fields mediating the nuclear interactions. Substantial polarization of the core nucleus is found for light nuclei, with central nuclear densities enhanced by almost a factor of two. The binding energies and widths calculated in this dynamical model differ appreciably from those calculated for a static nucleus. These calculations provide a lower limit of $Γ_{\bar K} \sim 50 \pm 10$ MeV on the width of nuclear bound states for $\bar K$ binding energy in the range $B_{\bar K} = 100 - 200$ MeV.
description: An updated expanded version of a talk first given in SNP'04, Osaka, July 2004. Presented at ISHIP 2006, Frankfurt, April 2006, to be published in Int. J. Mod. Phys. E
An interview with Mark Hahnel, CEO and Founder, Figshare
Creators: name: SPARC Europe
Publisher: name: Zenodo
Year: 2020
Subjects: sustainability, open science, funding, open access, open education, infrastructure

description: This is one of a series of interviews to share insights into the sustainability of open infrastructure services. These interviews were conducted in the Spring/Summer of 2020. This is an Invest in Open Infrastructure Project: https://investinopen.org. This work is supported by Open Society Foundations and SPARC Europe, in collaboration with Invest in Open Infrastructure. For more on this work see https://sparceurope.org/ioiinterviews
Tunable plasmon-enhanced second-order optical nonlinearity in transition metal dichalcogenide nanotriangles
Creators: name: Karimi, F.
name: Soleimanikahnoj, S.
name: Knezevic, I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The development of nanomaterials with a large nonlinear susceptibility is essential for nonlinear nanophotonics. We show that transition-metal-dichalcogenide (TMD) nanotriangles have a large effective second-order susceptibility [$χ^{(2)}$] at mid-infrared to near-infrared frequencies owing to their broken centrosymmetry. $χ^{(2)}$ is calculated within the density-matrix formalism that accounts for dissipation and screening. $χ^{(2)}$ peaks in the vicinity of both two-photon resonances (specified by the geometry) and plasmon resonances (tunable via the carrier density). Aligning the resonances yields the values of $χ^{(2)}$ as high as $10^{-6}$ m/V. These findings underscore the potential of TMD nanotriangles for nonlinear nanophotonics, particularly second-harmonic generation.
Line intensity enhancements in stellar coronal X-ray spectra due to opacity effects
Creators: name: Rose, S. J.
name: Matranga, M.
name: Mathioudakis, M.
name: Keenan, F. P.
name: Wark, J. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context. The I(15.01 A)/I(16.78 A) emission line intensity ratio in Fe XVII has been reported to deviate from its theoretical value in solar and stellar X-ray spectra. This is attributed to opacity in the 15.01 A line, leading to a reduction in its intensity, and was interpreted in terms of a geometry in which the emitters and absorbers are spatially distinct. Aims. We study the I(15.01 A)/I(16.78 A) intensity ratio for the active cool dwarf EV Lac, in both flare and quiescent spectra. Methods. The observations were obtained with the Reflection Grating Spectrometer on the XMM-Newton satellite. The emission measure distribution versus temperature reconstruction technique is used for our analysis. Results. We find that the 15.01 A line exhibits a significant enhancement in intensity over the optically thin value. To our knowledge, this is the first time that such an enhancement has been detected on such a sound statistical basis. We interpret this enhancement in terms of a geometry in which the emitters and absorbers are not spatially distinct, and where the geometry is such that resonant pumping of the upper level has a greater effect on the observed line intensity than resonant absorption in the line-of-sight.
description: accepted for publication in A&A
Neologica. 2015, n° 9
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2015
Subjects: subject: Amalgame
subject: Mot-valise
subject: Compocation
subject: Composition
subject: Morphologie et sémantique lexicales
subject: Néologie

description: Contributeurs : Natalia Beliaeva, Silvia Cacchiani, Svlitana Filonik, Jean-Michel Fortis, Bernard Fradin, Christophe Gérard, Gloria Guerrero Ramos, Clément Koama, Arnaud Léturgie, Julie Makri-Morel, Sandrine Reboul-Touré, Vincent Renner, Elke Ronneberger-Ibold et Camille Vorger.
High diffusivity pathways govern massively enhanced oxidation during tribological sliding
Creators: name: Rau, Julia S.
name: Balachandran, Shanoob
name: Schneider, Reinhard
name: Gumbsch, Peter
name: Gault, Baptiste
name: Greiner, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The lifetime of moving metallic components is often limited by accelerated oxidation. Yet, the mechanisms and pathways for oxidation during tribological loading are not well understood. Using copper as a model system, tribologically-induced oxidation is systematically investigated by varying the sliding speed and test duration under mild tribological loading. We demonstrate that tribo-oxidation is controlled by test duration rather than the number of cycles or the sliding speed. Plastic deformation from tribological loading creates dislocations, grain and phase boundaries that act as high diffusivity pathways. A combination of electron microscopy and atom probe tomography revealed significantly enhanced atomic concentration of the diffusing species around dislocations. Oxygen diffusion into the bulk as well as of copper towards the free surface along these defects control the oxide formation kinetics. Our work paves the way for formulating a physics-based understanding for tribo-oxidation, which is crucial to develop strategies to prevent oxidation and to strategically tailor surfaces to increase the lifetime of engineering systems.
An interview with Marta Teperek and Alastair Dunning on 4TU.ResearchData
Creators: name: SPARC Europe
Publisher: name: Zenodo
Year: 2020
Subjects: open science, research data, infrastructure, sustainability, financial sustainability, financial sustainability

description: This is one of a series of interviews to share insights into the sustainability of open infrastructure services. These interviews were conducted in the Spring/Summer of 2020. This is an Invest in Open Infrastructure Project: https://investinopen.org. This work is supported by Open Society Foundations and SPARC Europe, in collaboration with Invest in Open Infrastructure. For more on this work see https://sparceurope.org/ioiinterviews
Elliptic flow, eccentricity and eccentricity fluctuations
Creators: name: Loizides, Constantin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Differential studies of elliptic flow are one of the most powerful tools in studying the initial conditions and dynamical evolution of heavy ion collisions. The comparison of data from Cu+Cu and Au+Au collisions taken with the PHOBOS experiment at RHIC provides new information on the interplay between initial geometry and initial particle density in determining the observed final state flow pattern. Studies from PHOBOS point to the importance of fluctuations in the initial state geometry for understanding the Cu+Cu data. We relate the elliptic flow data to the results of our model studies on initial state geometry fluctuations and discuss how we will perform measurements of event-by-event fluctuations in elliptic flow in Au+Au collisions.
description: v1: 3 pages, 2 figures, contributions to the ISMD 2006 proceedings; v2: Spelling and minor wording improvements; v3: changes to due referee comments
Threshold Dilemmas
Creators: name: Sargent, Michael
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Psychology
subject: FOS: Psychology
subject: Social Psychology
subject: Social and Behavioral Sciences

description: In this project, we examine how people think about what have been called threshold problems. These are problems where a given action can cause harm to a group of which the actor might belong, but only if at least a given number of actors engage in the same behavior. For example, if a new technology allows for a fishing boat to be more productive (i.e., haul in more fish), and fewer than five boats can use the technology without fishing stocks being depleted, but depletion will occur if five or more boats use the technology, then this would qualify as a threshold problem. In these studies, we are examining licensing in such contexts. That is, under what circumstances will observers endorse licensing a given number of actors to engage in the potentially harmful action. We also want to explore the effects of observer identity as well as the identity of groups potentially harmed. (This work is part of Xavier Fallone's senior thesis at Bates College.)
Εκπαιδευτικές τροχιές φοιτητών-τριών από τη μουσουλμανική μειονότητα της Θράκης
Creators: name: Λαζαρίδου, Μαρία Περικλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Μουσουλμανική μειονότητα Θράκης
Εκπαιδευτική τροχιά
Muslim minority of Thrace
Educational trajectory

description: Η παρούσα ερευνητική εργασία αποπειράται να μελετήσει την εκπαιδευτική πορεία που πραγματοποίησαν οι φοιτητές και οι φοιτήτριες του Παιδαγωγικού Τμήματος Δημοτικής Εκπαίδευσης του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης, που κατάγονται από τη μουσουλμανική μειονότητα της Θράκης. Yποκείμενα της έρευνας αποτέλεσαν έντεκα (11) φοιτητές και φοιτήτριες του αναφερθέντος τμήματος, τα οποία μέσω συνεντεύξεων απάντησαν σε ερωτήματα που αφορούν στις εξής θεματικές: αξιολόγηση της εισόδου τους στην τριτοβάθμια εκπαίδευση, διγλωσσική ταυτότητα, εμπειρίες από το σχολικό πλαίσιο, εμπειρίες από το οικογενειακό περιβάλλον. Οι απαντήσεις που δόθηκαν αναλύθηκαν και αναπλαισιώθηκαν βάσει των ερευνητικών ερωτημάτων, ώστε να διευκρινιστεί και να περιγραφεί η διαδρομή των υποκειμένων μέχρι την εισαγωγή τους στο πανεπιστήμιο. Από τα ευρήματα αναδεικνύεται ο ιδιαίτερα υποστηρικτικός και καθοριστικός ρόλος του οικογενειακού πλαισίου για την επιτυχή εκπαιδευτική πορεία των παιδιών, καθώς επίσης και οι αδυναμίες του δίγλωσσου μειονοτικού εκπαιδευτικού συστήματος της Θράκης που δυσκολεύουν την ομαλή και επιτυχή εκπαιδευτική πορεία των μαθητών και μαθητριών
description: This research study attempts to examine the educational route which was performed by students of the School of Primary Education at the Aristotle University of Thessaloniki, who come from the Muslim minority of Thrace. Subjects of the study were eleven (11) students attending the School mentioned above. Data was collected through an interview procedure to questions which refer to the following thematic categories: evaluation of their access to the university, bilingual identity, experiences from the school context, and experiences from the family context. The collected data was analyzed and recontextualized according to the research questions, so that the participants’ trajectories to the university were amply described. Findings point to the role of the supporting family context but also reveal the weaknesses of the minority educational system that fails to support the children’s smooth educational trajectories