cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ambitable topological groups
Creators: name: Pachl, Jan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 43A10; 22A10; 54A25

description: A topological group is said to be ambitable if each uniformly bounded uniformly equicontinuous set of functions on the group with its right uniformity is contained in an ambit. For n=0,1,2,..., every locally aleph_n bounded topological group is either precompact or ambitable. In the familiar semigroups constructed over ambitable groups, topological centres have an effective characterization.
description: LaTeX; 12 pages; Changes in versions 2 and 3: New Theorem 3.3 and improvements enabled by it; Changes in version 4: Corrections for Theorems 4.9 and 4.10, added 1 reference
Analysis of funding information present in Scopus and Web of Science - a case of 16 journals of Russian origin
Creators: name: Lutay, Alexei
Publisher: name: Figshare
Year: 2019
Subjects: subject: Library and Information Studies
subject: FOS: Media and communications

description: This post is an addendum to the study of 24 academic journals of Russian origin and their presence in 3 academic databases - the Lens, CrossRef, and Scopus.The list of journals is narrowed down to 16 journals that are present in both Scopus and Web of Science.
Human hand grasping experiments: raw grasping data
Creators: name: Heinemann, Fabian
name: Puhlmann, Steffen
name: Eppner, Clemens
name: Álvarez-Ruiz, José
name: Meartens, Marianne
name: Brock, Oliver
Publisher: name: Technische Universität Berlin
Year: 2019
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: Grasping
subject: Human studies

description: This dataset contains grasping data from human grasping experiments. The sensors used are: FT-Sensor (for contact forces), Touchpad (contact traces), MoCap-System (Hand position and orientation), Cyberglove (finger postures).
Fast quantum noise in Landau-Zener transition
Creators: name: Pokrovsky, Valery L.
name: Sun, Deqiang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show by direct calculation starting from a microscopic model that the two-state system with time-dependent energy levels in the presence of fast quantum noise obeys the master equation. The solution of master equation is found analytically and analyzed in a broad range of parameters. The fast transverse noise affects the transition probability during much longer time (the accumulation time) than the longitudinal one. The action of the fast longitudinal noise is restricted by the shorter Landau-Zener time, the same as in the regular Landau-Zener process. The large ratio of time scales allows solving the Landau-Zener problem with longitudinal noise only, then solving the same problem with the transverse noise only and matching the two solutions. The correlation of the longitudinal and transverse noise renormalizes the Landau-Zener transition matrix element and can strongly enhance the survival probability, whereas the transverse noise always reduces it. Both longitudinal and transverse noise reduce the coherence. The decoherence time is inverse proportional to the noise intensity. If the noise is fast, its intensity at which the multi-quantum processes become essential corresponds to a deeply adiabatic regime. We briefly discuss possible applications of the general theory to the problem of the qubit decoherence and to the spin relaxation of molecular magnets.
description: 12 pages, 8 figures
Optimal Lipschitz Estimates for the $\bar\partial$ equation on a class of convex domains
Creators: name: Nguyen, Viet-Anh
name: Youssfi, El Hassan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32A22, 32A25

description: In this paper, we consider the Cauchy-Riemann equation $\bar\partial u= f$ in a new class of convex domains in $\C^n.$ We prove that under $L^p$ data, we can choose a solution in the Lipschitz space $Λ_α,$ where $α$ is an optimal positive number given explicitly in terms of $p.$
Two-loop QCD corrections to semileptonic b-quark decays near maximum recoil
Creators: name: Pak, A.
name: Blokland, I.
name: Czarnecki, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Two-gluon radiative corrections to the $b\to c\ellν$ decay width have been computed analytically as an expansion in terms of \frac{m_c}{m_b} << 1 in the kinematical limit of zero lepton invariant mass. The obtained results match smoothly with a previously known expansion around (1 - \frac{m_c}{m_b} << 1. Together they describe the process $b\to c\ellν$ for all mass ratios \frac{m_c}{m_b}.
description: 9 pages, 4 figures, submitted to Phys. Rev. D
Inertia and delocalized twisted cohomology
Creators: name: Bunke, Ulrich
name: Spitzweck, Markus
name: Schick, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: We show that the inertia stack of a topological stack is again a topological stack. We further observe that the inertia stack of an orbispace is again an orbispace. We show how a U(1)-banded gerbe over an orbispace gives rise to a flat line bundle over its inertia stack. Via sheaf theory over topological stacks it gives rise to the twisted delocalized cohomology of the orbispace. With these results and constructions we generalize concepts, which are well-known in the smooth framework, to the topological case. In the smooth case we show, that our sheaf-theoretic definition of twisted delocalized cohomology of orbispaces coincides with former definitions using a twisted de Rham complex.
description: 42 pages
Προβληματισμοί γύρω από τη διάγνωση Δ.Α.Φ. στην παιδική ηλικία
Creators: name: Ρομποτή, Πηνελόπη Παναγιώτη
name: Τσακώνη, Ζωή Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διάχυτες Αναπτυξιακές Διαταραχές-Τελική διάγνωση
Διαταραχές Αυτιστικού Φάσματος
Pervasive Developmental Disorders-Final diagnosis
Autistic Spectrum Disorder

description: Η παρούσα έρευνα μελέτησε περιπτώσεις παιδιών με διάγνωση Διάχυτες Αναπτυξιακές Διαταραχές (ΔΑΔ), προκειμένου να διαπιστωθεί αν η διάγνωση αυτή παραμένει σταθερή ή διαφοροποιείται μετά από μία δεύτερη αξιολόγηση του παιδιού σε παιδοψυχιατρική υπηρεσία. Η έρευνα βασίστηκε στα ιατρικά ιστορικά παιδιών που επισκέφθηκαν τα εξωτερικά ιατρεία της Υπηρεσίας Παιδιού και Εφήβου της Γ’ Πανεπιστημιακής Ψυχιατρικής Κλινικής του Νοσοκομείου ΑΧΕΠΑ στη Θεσσαλονίκη καθώς και το Ιατροπαιδαγωγικό τμήμα του Κέντρου Ψυχικής Υγείας Κατερίνης από το 2007 έως και το 2017. Χρησιμοποιήθηκε η ταξινόμηση σύμφωνα με το Διαγνωστικό και Στατιστικό Εγχειρίδιο των Ψυχικών Νόσων της Αμερικανικής Ψυχιατρικής Εταιρίας DSM-IV και το σύστημα της Διεθνούς Ταξινόμησης των Ψυχικών Διαταραχών και Διαταραχών Συμπεριφοράς ICD-10. Η ανάλυση των δεδομένων πραγματοποιήθηκε με το στατιστικό πακέτο SPSS ver. 23. Μελετήθηκαν 190 περιστατικά από τα οποία τα 147 έλαβαν διάγνωση και από άλλους ειδικούς. Από αυτά στα 80 η τελική διάγνωση διαφοροποιείται, χωρίς όμως να είναι στατιστικά σημαντική αυτή η διαφορά. Βρέθηκε σημαντική συσχέτιση της μη σωστής διάγνωσης με τη διαταραχή λόγου και με την ιατρική ειδικότητα
description: The present survey studied cases of children with Pervasive Developmental Disorder (PDD), in order to determine whether the diagnosis remains stable or differentiated after a second assessment of the child, in a child psychiatric service. The survey was based on the medical history of children who attended outpatient clinics of the Child and Adolescent Service of the University Hospital of Psychiatry (AHEPA) in Thessaloniki, as well as, the Child/Adolescent Department of the Community Mental Health Center of Katerini from 2007 to 2017. The classification was done according to the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association DSM-IV and the system of the International Classification of Mental and Behavioral Disorders ICD-10. The data analysis was carried out using the statistical tool SPSS ver. 23. 190 cases were investigated, 147 of which were diagnosed by other colleagues. In 80 of these cases the final diagnosis differs, but this difference is not statistically significant. An important correlation between inappropriate diagnosis with speech disorder and medical specialty was found
Additional file 1 of Triple blockade of Ido-1, PD-L1 and MEK as a potential therapeutic strategy in NSCLC
Creators: name: Della Corte, Carminia Maria
name: Ciaramella, Vincenza
name: Ramkumar, Kavya
name: Vicidomini, Giovanni
name: Fiorelli, Alfonso
name: Nardone, Valerio
name: Cappabianca, Salvatore
name: Cozzolino, Immacolata
name: Zito Marino, Federica
name: Di Guida, Gaetano
name: Wang, Qi
name: Cardnell, Robert
name: Gay, Carl Michael
name: Ciardiello, Davide
name: Martinelli, Erika
name: Troiani, Teresa
name: Martini, Giulia
name: Napolitano, Stefania
name: Wang, Jing
name: Byers, Lauren Averett
name: Ciardiello, Fortunato
name: Morgillo, Floriana
Publisher: name: figshare
Year: 2022
Subjects: subject: Space Science
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Figure S1. Correlation of mRNA expression level of IDO1 with protein expression of PD-L1 in TCGA LUAD tumors (A) and NSCLC cell lines (B).
Scale-invariant cellular automata and self-similar Petri nets
Creators: name: Schaller, Martin
name: Svozil, Karl
Publisher: name: arXiv
Year: 2006
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Physical sciences

description: Two novel computing models based on an infinite tessellation of space-time are introduced. They consist of recursively coupled primitive building blocks. The first model is a scale-invariant generalization of cellular automata, whereas the second one utilizes self-similar Petri nets. Both models are capable of hypercomputations and can, for instance, "solve" the halting problem for Turing machines. These two models are closely related, as they exhibit a step-by-step equivalence for finite computations. On the other hand, they differ greatly for computations that involve an infinite number of building blocks: the first one shows indeterministic behavior whereas the second one halts. Both models are capable of challenging our understanding of computability, causality, and space-time.
description: 35 pages, 5 figures
Jack The Rippler: Arbitrage on the Decentralized Exchange of the XRP Ledger
Creators: name: Peduzzi, Gaspard
name: James, Jason
name: Xu, Jiahua
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The XRP Ledger (XRPL) is a peer-to-peer cryptographic ledger. It features a decentralized exchange (DEX) where network participants can issue and trade user-defined digital assets and currencies. We present Jack the Rippler, a bot that identifies and exploits arbitrage opportunities on the XRPL DEX. We describe Jack's arbitrage process and discuss risks associated with using arbitrage bots.
Double coherence resonance in neuron models driven by discrete correlated noise
Creators: name: Kreuz, Thomas
name: Luccioli, Stefano
name: Torcini, Alessandro
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the influence of correlations among discrete stochastic excitatory or inhibitory inputs on the response of the FitzHugh-Nagumo neuron model. For any level of correlation the emitted signal exhibits at some finite noise intensity a maximal degree of regularity, i.e., a coherence resonance. Furthermore, for either inhibitory or excitatory correlated stimuli a {\it Double Coherence Resonance} (DCR) is observable. DCR refers to a (absolute) maximum coherence in the output occurring for an optimal combination of noise variance and correlation. All these effects can be explained by taking advantage of the discrete nature of the correlated inputs.
description: 4 pages, 3 figures in eps, to appear in Physical Review Letters
Μορφές του πρόσφυγα και μετανάστη στο μυθιστορηματικό έργο της Λότης Πέτροβιτς Ανδρουτσοπούλου
Creators: name: Χρηστομάτη, Ευδοκία Χαρίτου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Παιδική Λογοτεχνία
Πολιτισμική εικονολογία
Ταυτότητα
Στερεότυπα
Μετανάστης
Πρόσφυγας
Children's Literature
Imagologie
Identity
Stereotypes
Immigrant
Refugee

description: Η παρούσα εργασία επιδιώκει να διερευνήσει το μυθιστορηματικό έργο για παιδιά και νέους της Λότης Πέτροβιτς Ανδρουτσοπούλου, και ιδιαίτερα τις μορφές του πρόσφυγα και μετανάστη που συναντάμε σε έντεκα (11) κοινωνικά μυθιστορήματα. Στόχος της εργασίας είναι να ανιχνεύσει και να καταγράψει σε πρώτο επίπεδο τα χαρακτηριστικά της ετερότητας, και σε δεύτερο επίπεδο τις σχέσεις του «άλλου» με την κυρίαρχη κοινωνικά ομάδα, τον γηγενή πληθυσμό. Αρχικά αναλύεται θεωρητικά όλο το πλαίσιο των εννοιών της μετανάστευσης, της ταυτότητας και ετερότητας, εννοιών που απασχολούν τις κοινωνίες, ιδιαίτερα σήμερα που η μετακίνηση πληθυσμών είναι πολυδιάστατη και σε κάποιες περιπτώσεις θεωρείται ως απειλή από τις κοινωνίες των χωρών υποδοχής προσφύγων και μεταναστών. Η μετακίνηση αυτή διαταράσσει το ισχύον κοινωνικό σύστημα κάθε χώρας και δημιουργεί αισθήματα ανασφάλειας και φόβου προς τον «άλλο». Στη συνέχεια παρουσιάζεται η μέθοδος ανάλυσης των κειμένων, ακολουθεί η σύντομη παρουσίαση των έργων και η ανάλυσή τους με βάση τη μεθοδολογία, και τέλος διατυπώνονται τα τελικά συμπεράσματα.
description: This research seeks to investigate Loty Petrovits Androutsopoulou’s novels for children and young people, and particularly the forms of refugee and immigrant that can be found in eleven (11) of her social novels. It is the aim of the research to detect and record on the first level the characteristics of heterogeneity, and on the second level, the relationship between the “other” and the dominant social group, the native population. Initially, the concepts of migration, identity and diversity are conceptually analyzed. These concepts are of societal concern, especially today, when population shift is multidimensional and in some cases is considered a threat by the society of the host countries. This movement disrupts the current social system of each country and creates feelings of insecurity and fear towards the “other”. The method of the text’s analysis is then presented, which is followed by a brief presentation of the texts and their analysis based on methodology, and in the end we draw the final conclusions.
Nonholonomic Ricci Flows: II. Evolution Equations and Dynamics
Creators: name: Vacaru, Sergiu I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C44, 53C21, 53C25, 83C15, 83C99, 83E99

description: This is the second paper in a series of works devoted to nonholonomic Ricci flows. By imposing non-integrable (nonholonomic) constraints on the Ricci flows of Riemannian metrics we can model mutual transforms of generalized Finsler-Lagrange and Riemann geometries. We verify some assertions made in the first partner paper and develop a formal scheme in which the geometric constructions with Ricci flow evolution are elaborated for canonical nonlinear and linear connection structures. This scheme is applied to a study of Hamilton's Ricci flows on nonholonomic manifolds and related Einstein spaces and Ricci solitons. The nonholonomic evolution equations are derived from Perelman's functionals which are redefined in such a form that can be adapted to the nonlinear connection structure. Next, the statistical analogy for nonholonomic Ricci flows is formulated and the corresponding thermodynamical expressions are found for compact configurations. Finally, we analyze two physical applications: the nonholonomic Ricci flows associated to evolution models for solitonic pp-wave solutions of Einstein equations, and compute the Perelman's entropy for regular Lagrange and analogous gravitational systems.
description: v2 41 pages, latex2e, 11pt, the variant accepted by J. Math. Phys. with former section 2 eliminated, a new section 5 with applications in gravity and geometric mechanics, and modified introduction, conclusion and new references
Is the Photon Really a Particle? V.2
Creators: name: Klevgard, Paul A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Physics (physics.gen-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Photons deliver their energy and momentum to a point on a material target. It is commonplace to attribute this to particle impact. But since the inflight photon also has a wave nature, we are stuck with the paradox of wave and particle duality. It is argued here that the photon's wave nature is indisputable, but its particle nature is open to question. Photons deliver energy. The problem with invoking impact as a means of delivery is that energy becomes a payload which in turn requires a particle. This assumes that energy is always a payload and there is but one mode of energy delivery; surely two unsupported assumptions. It should be possible to explain photon termination without invoking particle impact. One approach offered here is to question the assumption that the photon is a unitary object. Perhaps the photon has two linked but distinct identities: one supporting wave behavior and the other supporting discrete behavior. It is the latter that might imitate particle impact.
description: 4 pages; with appendix; Supporting video: youtu.be/A1Wabkr0YFE
Malin 1: A Deeper Look
Creators: name: Moore, Lesa
name: Parker, Quentin A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Our R-band data show that the optical light from Malin 1 corresponds well with the >2-arcmin extent of the galaxy's HI content and continues well beyond previously published V-band optical light radial profiles. Analysis of our image yields improved understanding of the galaxy's properties. We measure ellipticity of 0.20 +/- 0.03, implying inclination of 38 +/- 3 degrees, and we trace the radial profile to 77 arcsec. A single dusty spiral arm is also weakly discernable, and is consistent with the rotation direction of the HI and spiral structure of the inner disk. Possible scenarios for the origin of the spiral structure are discussed.
description: 7 pages, 4 figures, accepted for publication in PASA
Parametric excitation of wrinkles in elastic sheets on elastic and viscoelastic substrates
Creators: name: Diamant, Haim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Thin elastic sheets supported on compliant media form wrinkles under lateral compression. Since the lateral pressure is coupled to the sheet's deformation, varying it periodically in time creates a parametric excitation. We study the resulting parametric resonance of wrinkling modes in sheets supported on semi-infinite elastic or viscoelastic media, at pressures smaller than the critical pressure of static wrinkling. We find distinctive behaviors as a function of excitation amplitude and frequency, including (a) a different dependence of the dynamic wrinkle wavelength on sheet thickness compared to the static wavelength; and (b) a discontinuous decrease of the wrinkle wavelength upon increasing excitation frequency at sufficiently large pressures. In the case of a viscoelastic substrate, resonant wrinkling requires crossing a threshold of excitation amplitude. The frequencies for observing these phenomena in relevant experimental systems are of the order of a kilohertz and above. We discuss experimental implications of the results.
description: 10 pages, thoroughly revised and extended to include substrate inertia
Αποτίμηση σχεδιασμού πλατφόρμας Μαζικών Ανοιχτών Διαδικτυακών Μαθημάτων (MOOC): μια μελέτη περίπτωσης
Creators: name: Ευσταθιάδου, Ευαγγελία Ορέστη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πλατφόρμα
Σχεδιασμός
Μαζικά ανοιχτά διαδικτυακά μαθήματα
Platform
Design
Massive open online course

description: Στην παρούσα εργασία μελετάται η αξιοπιστία της εφαρμογής της ρουμπρίκας Open Suny Course Quality Review Rubric (OSCQR) στην ελληνική πραγματικότητα. Σκοπός της έρευνας είναι η χρήση της ρουμπρίκας ως εργαλείο αποτίμησης του σχεδιασμού μιας πλατφόρμας παροχής Μαζικών Ανοιχτών Διαδικτυακών Μαθημάτων (MOOCs) και η διερεύνηση ύπαρξης συσχετίσεων μεταξύ των δημογραφικών χαρακτηριστικών και των μεταβλητών της ρουμπρίκας. Επιπλέον στόχος, είναι η πρόταση καλών πρακτικών για την δημιουργία MOOCs, με βάση τις απαντήσεις των ερωτώμενων και την διεθνή βιβλιογραφία. Για την επίτευξη των στόχων διαμοιράστηκαν 494 ρουμπρίκες σε σπουδαστές δυο ελληνικών παρόχων MOOCs. Οι σπουδαστές, πήραν το ρόλο του “ειδικού” και έλεγξαν τις πλατφόρμες για να καταλήξουν σε συμπεράσματα για την ποιότητα, την αποτελεσματικότητα και την επάρκεια του σχεδιασμού τους. Από την ανάλυση των δεδομένων που συλλέχθηκαν προέκυψε ότι η ελληνική εκδοχή της ρουμπρίκας OSCQR είναι ένα έγκυρο εργαλείο αποτίμησης του σχεδιασμού μιας πλατφόρμας που προσφέρει MOOCs στα ελληνικά. Επίσης, βρέθηκαν συσχετίσεις κάποιων δημογραφικών στοιχείων με συγκεκριμένες ερωτήσεις της ρουμπρίκας. Τέλος, δημιουργήθηκαν οι προτάσεις καλών πρακτικών για ελληνόφωνα MOOCs.
description: The reliability of the Open Suny Course Quality Review Rubric (OSCQR) application in Greek reality is studied in this paper. The purpose of the research is to validate the rubric as a tool for evaluating the design of a massive open online course (MOOCs) platform and to investigate the existence of correlations between demographic and rubric variables. A further objective is to propose satisfactory practices for creating MOOCs, based on respondents' replies and international bibliography. To achieve the objectives, 494 rubrics were distributed to students of two Greek MOOCs providers. The students took the role of a "specialist" and checked the platforms to come up with conclusions about the quality, efficiency and adequacy of their design. The analysis of the data collected revealed that the Greek version of the rubric OSCQR is a valid tool for evaluating the design of a platform that offers MOOCs in Greek. Correlations of some demographics with specific rubric questions were found,as well. Finally, beneficial practice suggestions for Greek-speaking MOOCs have been created.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Ιωαννίνων)
Macroscopic quantum tunneling and quasiparticle-tunneling blockade effect in s-wave/d-wave hybrid junctions
Creators: name: Kawabata, S.
name: Golubov, A. A.
name: Ariando
name: Verwijs, C. J. M.
name: Hilgenkamp, H.
name: Kirtley, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have theoretically investigated macroscopic quantum tunneling (MQT) and the influence of nodal quasiparticles and zero energy bound states (ZES) on MQT in s-wave/ d-wave hybrid Josephson junctions. In contrast to d-wave/d-wave junctions, the low-energy quasiparticle dissipation resulting from nodal quasiparticles and ZES is suppressed due to a quasiparticle-tunneling blockade effect in an isotropic s-wave superconductor. Therefore, the inherent dissipation in these junctions is found to be very weak. We have also investigated MQT in a realistic s-wave/d-wave (Nb/Au/YBCO) junction in which Ohmic dissipation in a shunt resistance is stronger than the inherent dissipation and find that MQT is observable within the current experimental technology. This result suggests high potential of s-wave/d-wave hybrid junctions for applications in quantum information devices.
description: 4 pages, 3 figures
Στάσεις και αντιλήψεις εν ενεργεία εκπαιδευτικών της πρωτοβάθμιας εκπαίδευσης για την εκπαιδευτική ρομποτική
Creators: name: Βαρμάζη, Αντωνία Αντώνιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Εκπαιδευτική ρομποτική
Εκπαιδευτικά ρομπότ
Στάσεις και αντιλήψεις εκπαιδευτικών
Educational robotics
Educational robots
Teachers’ attitudes and perceptions

description: Στην παρούσα μελέτη διερευνήσαμε τις στάσεις των εκπαιδευτικών σχετικά με τις επιπτώσεις της χρήσης της ρομποτικής στις δεξιότητες δια βίου μάθησης των μαθητών. Επίσης, διερευνήσαμε τις στάσεις των εκπαιδευτικών σχετικά με τα εμπόδια στη χρήση της ρομποτικής. Διερευνήσαμε περαιτέρω τις αντιλήψεις των εκπαιδευτικών για την υποστήριξη που χρειάζονται για να χρησιμοποιήσουν τη ρομποτική και τους πόρους που θα πρέπει να τους παρέχει η σχολική διοίκηση. Στη μελέτη αυτή συμμετείχαν εξήντα εκπαιδευτικοί πρωτοβάθμιας εκπαίδευσης. Τα αποτελέσματα αυτής της μελέτης αποκάλυψαν ότι οι εκπαιδευτικοί θεωρούν ότι η ρομποτική έχει θετικές επιπτώσεις στις δεξιότητες δια βίου μάθησης των μαθητών. Επιπλέον, οι συμμετέχοντες ανέφεραν ορισμένα εμπόδια στην ενσωμάτωση της ρομποτικής στις διδακτικές τους δραστηριότητες και εξέφρασαν την υποστήριξη που χρειάζονται για να χρησιμοποιήσουν τη ρομποτική και τους πόρους που πρέπει να τους παρέχει η σχολική διοίκηση.
description: In the present study, we investigated teachers’ attitudes of the effects of using robotics on students’ lifelong learning skills. We also investigated teachers’ attitudes of the barriers of using robotics. We further explored teachers’ perceptions of the support they need in order to employ robotics and the resources that school administration should provide them. Sixty primary teachers participated in this study. The results of this study revealed that teachers perceive that robotics has positive effects on students’ lifelong learning skills. Furthermore, the participants indicated a number of barriers to integrate robotics into their teaching activities and expressed the support they need in order to employ robotics and the resources that school administration should provide them.
Using a quantum dot as a high-frequency shot noise detector
Creators: name: Onac, E.
name: Balestro, F.
name: van Beveren, L. H. Willems
name: Hartmann, U.
name: Nazarov, Y. V.
name: Kouwenhoven, L. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present the experimental realization of a Quantum Dot (QD) operating as a high-frequency noise detector. Current fluctuations produced in a nearby Quantum Point Contact (QPC) ionize the QD and induce transport through excited states. The resulting transient current through the QD represents our detector signal. We investigate its dependence on the QPC transmission and voltage bias. We observe and explain a quantum threshold feature and a saturation in the detector signal. This experimental and theoretical study is relevant in understanding the backaction of a QPC used as a charge detector.
description: 4 pages, 4 figures, accepted for publication in Physical Review Letters
Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor
Creators: name: Zhang, Zelin
name: Chen, Songbai
name: Qin, Xin
name: Jing, Jiliang
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We have studied polarized image of a Schwarzschild black hole with an equatorial thin accretion disk as photon couples to Weyl tensor. The birefringence of photon originating from the coupling affect the black hole shadow, the thin disk pattern and its luminosity distribution. We also analyze the observed polarized intensity in the sky plane. The observed polarized intensity in the bright region is stronger than that in the darker region. The stronger effect of the coupling on the observed polarized vector appears only in the bright region close to black hole. These features in the polarized image could help us to understand black hole shadow, the thin accretion disk and the coupling between photon and Weyl tensor.
description: 15 pages, 11 figures, the accepted version for publication in EPJC
RaSE: A Variable Screening Framework via Random Subspace Ensembles
Creators: name: Tian, Ye
name: Feng, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Variable screening methods have been shown to be effective in dimension reduction under the ultra-high dimensional setting. Most existing screening methods are designed to rank the predictors according to their individual contributions to the response. As a result, variables that are marginally independent but jointly dependent with the response could be missed. In this work, we propose a new framework for variable screening, Random Subspace Ensemble (RaSE), which works by evaluating the quality of random subspaces that may cover multiple predictors. This new screening framework can be naturally combined with any subspace evaluation criterion, which leads to an array of screening methods. The framework is capable to identify signals with no marginal effect or with high-order interaction effects. It is shown to enjoy the sure screening property and rank consistency. We also develop an iterative version of RaSE screening with theoretical support. Extensive simulation studies and real-data analysis show the effectiveness of the new screening framework.
description: 58 pages, 6 figures, 6 tables
Non-reciprocal energy transfer through the Casimir effect
Creators: name: Xu, Zhujing
name: Gao, Xingyu
name: Bang, Jaehoon
name: Jacob, Zubin
name: Li, Tongcang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A fundamental prediction of quantum mechanics is that there are random fluctuations everywhere in a vacuum because of the zero-point energy. Remarkably, quantum electromagnetic fluctuations can induce a measurable force between neutral objects, known as the Casimir effect, which has attracted broad interests. The Casimir effect can dominate the interaction between microstructures at small separations and has been utilized to realize nonlinear oscillation, quantum trapping, phonon transfer, and dissipation dilution. However, a non-reciprocal device based on quantum vacuum fluctuations remains an unexplored frontier. Here we report quantum vacuum mediated non-reciprocal energy transfer between two micromechanical oscillators. We modulate the Casimir interaction parametrically to realize strong coupling between two oscillators with different resonant frequencies. We engineer the system's spectrum to have an exceptional point in the parameter space and observe the asymmetric topological structure near it. By dynamically changing the parameters near the exceptional point and utilizing the non-adiabaticity of the process, we achieve non-reciprocal energy transfer with high contrast. Our work represents an important development in utilizing quantum vacuum fluctuations to regulate energy transfer at the nanoscale and build functional Casimir devices.
Does the Third Law of Thermodynamics hold in the Quantum Regime?
Creators: name: O'Connell, R. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The first in a long series of papers by John T. Lewis, G. W. Ford and the present author, considered the problem of the most general coupling of a quantum particle to a linear passive heat bath, in the course of which they derived an exact formula for the free energy of an oscillator coupled to a heat bath in thermal equilibrium at temperature T. This formula, and its later extension to three dimensions to incorporate a magnetic field, has proved to be invaluable in analyzing problems in quantum thermodynamics. Here, we address the question raised in our title viz. Nernst's third law of thermodynamics.
Ο οργανικός ρόλος της εικόνας στις εικονογραφημένες αφηγήσεις – Εικονιστικές και μυθοπλαστικές ασκήσεις δημιουργικής γραφής στη Β’ Δημοτικού
Creators: name: Μπαχτσιαβάνου, Γεωργία Στέργιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Οργανικός ρόλος εικόνας
Εικονογραφημένες αφηγήσεις
Ασκήσεις δημιουργικής γραφής
Dynamic role of image
Picturebooks
Creative writing activities

description: Στόχος της παρούσας εργασίας είναι η διερεύνηση της οργανικής σχέσης κειμένου και εικόνας μέσα από την κριτική ανάγνωση δεκαοχτώ εικονογραφημένων βιβλίων παιδικής λογοτεχνίας. Η μελέτη έγινε με βάση το θεωρητικό μοντέλο της αλληλοεξαρτώμενης αφήγησης της Agosto και τους πέντε τύπους σχέσης κειμένου - εικόνας της Golden. Το ερευνητικό κομμάτι της μελέτης παρουσιάζει την παραγωγή εικονιστικών και μυθοπλαστικών ασκήσεων δημιουργικής γραφής, στηριζόμενες σε δύο βιβλία. Η έρευνα υλοποιήθηκε σε πλαίσια κανονικής τυπικής σχολικής τάξης, συγκεκριμένα σε είκοσι πέντε μαθητές της δευτέρας δημοτικού. Οι στόχοι των δημιουργικών ασκήσεων ήταν δύο. Αφενός να εξεταστεί η πιθανότητα εάν οι μαθητές μπορούν να κατανοήσουν την ισορροπία που υπάρχει μεταξύ πληροφοριών που δίνονται από τις εικόνες και το κείμενο και εάν μπορούν να τις καταγράψουν και να τις αποτυπώσουν σε δική τους κειμενική κατασκευή. Αφετέρου να ελεγχθεί η δυναμική της εικόνας, όσον αφορά στην ποιοτική και ποσοτική χρήση από μέρους των μαθητών πληροφοριών, που προσφέρονται από αυτή για τη συγγραφή του κειμένου τους, σε σημείο όμως που οι πληροφορίες να μην αποκλίνουν από αυτές που δίνει το κείμενο. Η εν λόγω εργασία ολοκληρώνεται με τη δημιουργία – κατασκευή ενός προσωπικού άλμπουμ – βιβλίου, το οποίο συνοδεύεται από κείμενο και εικόνες.
description: The aim of the present thesis is the study of the relationship between text and picture through the critical reading of eighteen picturebooks. The study was done according the Agosto’s model of interdependent stolytelling and the five types of relationship between text and picture presented by Golden. This research presents pictorial and creative writing activities based on two books. The research took place in a school class, of twenty five second grade students. The objectives of these writing activities were two. First objective was to evaluate the ability of students to identify the balance between text and picture and write them down on a text that they would create. The second objective was to create stories based on the study of the pictures and investigate how much the dynamic role of image can influence the creation of new text being always correlated to the text of the picturebook that was studied. This thesis was completed by creating a picture book on my own.
Η σκηνογραφία ως εικαστικό είδος. Η περίπτωση του Δημήτρη Παπαϊωάννου
Creators: name: Θαλασσά, Χριστίνα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Σκηνογραφία
Δημήτρης Παπαϊωάννου
Εικαστικές τέχνες
Scenography
Dimitris Papaioannou
Visual Arts

description: Αντικείμενο της παρούσας εργασίας είναι η όψη στο έργο του εικαστικού καλλιτέχνη, σκηνοθέτη, χορογράφου και χορευτή Δημήτρη Παπαϊωάννου, ιδωμένη μέσα στο γενικότερο πλαίσιο των σκηνοθετικών του αναζητήσεων. Ο στόχος της εργασίας είναι να αναλυθούν οι εικόνες που παρουσιάζονται στο έργο του και συνεπώς η σκηνογραφία που επιλέγεται κάθε φορά, καθώς σε αυτήν οφείλεται η οπτική παρουσίαση της κάθε παράστασης. Ειδικότερα, η εργασία στοχεύει στην ανάλυση του τρόπου με τον οποίο η σκηνογραφία, τα σκηνικά αντικείμενα και η χρήση τους από τους περφόρμερς, μπορούν να αποτελέσουν μέσο αφήγησης αντί του λόγου, δημιουργώντας ταυτόχρονα ποιητικές εικόνες και ταμπλό βιβάν. Η συγγραφή της εργασίας ακολουθεί κατά βάση έναν χρονολογικό άξονα, όπου διαγράφεται η πορεία του καλλιτέχνη από τα πρώτα κιόλας δείγματα της καλλιτεχνικής του δημιουργίας μέχρι και σήμερα. Ακόμη, με σκοπό την πιο σφαιρική προσέγγιση, γίνεται αναφορά σε επιρροές που δέχθηκε ο καλλιτέχνης από την παγκόσμια τέχνη και επισημαίνεται ο τρόπος που αυτές ενσωματώθηκαν στο έργο του, τόσο στο ξεκίνημα της καριέρας του, όσο και στην πορεία που ακολούθησε και ακολουθεί μέχρι σήμερα. Τέλος, από το σύνολο της έρευνας δεν απουσιάζει η τελική αποτίμηση του κάθε έργου του και η πρόσληψή του από τους θεατές και τους κριτικούς που το παρακολούθησαν.
description: The subject of the present dissertation is the visual aspect in the work of the artist, director, choreographer and dancer Dimitris Papaioannou, seen within the general framework of his directorial explorations. The aim of the dissertation is to analyse the images presented in his work and hence the scenography chosen each time, because this relates to the visual presentation of each performance. In particular, the work aims to analyze how scenography, stage props and their use by performers can be a means of narrative rather than speech, creating at the same time poetic images and tableaux vivants. The dissertation is essentially written on a chronological axis, where the artist's journey is presented from the very first samples of his artistic creation until today. In addition, with a view to a more global approach, reference is made to influences that the artist has received from the world art and highlights the way they have been incorporated into his work, both in the beginning of his career and in the course that followed and follows to this day. Finally, the entire research does not lack the final evaluation of each of his works and their reception by the viewers and the critics who attended them.
Analyzing the barren plateau phenomenon in training quantum neural networks with the ZX-calculus
Creators: name: Zhao, Chen
name: Gao, Xiao-Shan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this paper, we propose a general scheme to analyze the gradient vanishing phenomenon, also known as the barren plateau phenomenon, in training quantum neural networks with the ZX-calculus. More precisely, we extend the barren plateaus theorem from unitary 2-design circuits to any parameterized quantum circuits under certain reasonable assumptions. The main technical contribution of this paper is representing certain integrations as ZX-diagrams and computing them with the ZX-calculus. The method is used to analyze four concrete quantum neural networks with different structures. It is shown that, for the hardware efficient ansatz and the MPS-inspired ansatz, there exist barren plateaus, while for the QCNN ansatz and the tree tensor network ansatz, there exists no barren plateau.
The Balanced Mode Decomposition Algorithm for Data-Driven LPV Low-Order Models of Aeroservoelastic Systems
Creators: name: Iannelli, Andrea
name: Fasel, Urban
name: Smith, Roy S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A novel approach to reduced-order modeling of high-dimensional time varying systems is proposed. It leverages the formalism of the Dynamic Mode Decomposition technique together with the concept of balanced realization. It is assumed that the only information available on the system comes from input, state, and output trajectories generated by numerical simulations or recorded and estimated during experiments, thus the approach is fully data-driven. The goal is to obtain an input-output low dimensional linear model which approximates the system across its operating range. Since the dynamics of aeroservoelastic systems markedly changes in operation (e.g. due to change in flight speed or altitude), time-varying features are retained in the constructed models. This is achieved by generating a Linear Parameter-Varying representation made of a collection of state-consistent linear time-invariant reduced-order models. The algorithm formulation hinges on the idea of replacing the orthogonal projection onto the Proper Orthogonal Decomposition modes, used in Dynamic Mode Decomposition-based approaches, with a balancing oblique projection constructed entirely from data. As a consequence, the input-output information captured in the lower-dimensional representation is increased compared to other projections onto subspaces of same or lower size. Moreover, a parameter-varying projection is possible while also achieving state-consistency. The validity of the proposed approach is demonstrated on a morphing wing for airborne wind energy applications by comparing the performance against two algorithms recently proposed in the literature. Comparisons cover both prediction accuracy and performance in model predictive control applications.
description: Accepted for publication in Aerospace Science and Technology (open-access version available)
Anti-correlation between the mass of a supermassive black hole and the mass accretion rate in type I ultraluminous infrared galaxies and nearby QSOs
Creators: name: Kawakatu, Nozomu
name: Imanishi, Masatoshi
name: Nagao, Tohru
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discovered a significant anti-correlation between the mass of a supermassive black hole (SMBH), $M_{\rm BH}$, and the luminosity ratio of infrared to active galactic nuclei (AGN) Eddington luminosity, $L_{\rm IR}/L_{\rm Edd}$, over four orders of magnitude for ultraluminous infrared galaxies with type I Seyfert nuclei (type I ULIRGs) and nearby QSOs. This anti-correlation ($M_{\rm BH}$ vs. $L_{\rm IR}/L_{\rm Edd}$) can be interpreted as the anti-correlation between the mass of a SMBH and the rate of mass accretion onto a SMBH normalized by the AGN Eddington rate, $\dot{M}_{\rm BH}/\dot{M}_{\rm Edd}$. In other words, the mass accretion rate $\dot{M}_{\rm BH}$ is not proportional to that of the central BH mass. Thus, this anti-correlation indicates that BH growth is determined by the external mass supply process, and not the AGN Eddington-limited mechanism. Moreover, we found an interesting tendency for type I ULIRGs to favor a super-Eddington accretion flow, whereas QSOs tended to show a sub-Eddington flow. On the basis of our findings, we suggest that a central SMBH grows by changing its mass accretion rate from super-Eddington to sub-Eddington. According to a coevolution scenario of ULIRGs and QSOs based on the radiation drag process, it has been predicted that a self-gravitating massive torus, whose mass is larger than a central BH, exists in the early phase of BH growth (type I ULIRG phase) but not in the final phase of BH growth (QSO phase). At the same time, if one considers the mass accretion rate onto a central SMBH via a turbulent viscosity, the anti-correlation ($M_{\rm BH}$ vs. $L_{\rm IR}/L_{\rm Edd}$) is well explained by the positive correlation between the mass accretion rate $\dot{M}_{\rm BH}$ and the mass ratio of a massive torus to a SMBH.
description: 29 pages, 4 figures, accepted for publication in ApJ
Simulating the transport of relativistic electrons and magnetic fields injected by radio galaxies in the intracluster medium
Creators: name: Vazza, F.
name: Wittor, D.
name: Brunetti, G.
name: Brüggen, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Radio galaxies play an important role in the seeding of cosmic rays and magnetic fields in galaxy clusters. Here, we simulate the evolution of relativistic electrons injected into the intracluster medium by radio galaxies. Using passive tracer particles added to magnetohydrodynamical adaptive-mesh simulations, we calculate the evolution of the spectrum of relativistic electrons taking into account energy losses and re-acceleration mechanisms associated with the dynamics of the intracluster medium. Re-acceleration can occur at shocks via diffusive shock acceleration, and in turbulent flows via second-order Fermi re-acceleration. This study confirms that relativistic electrons from radio galaxies can efficiently fill the intracluster medium over scales of several $100 \rm ~Myr$, and that they create a stable reservoir of fossil electrons that remains available for further re-acceleration by shock waves and turbulent gas motions. Our results also show that late evolution of radio lobes and remnant radio galaxies is significantly affected by the dynamics of the surrounding intracluster medium. Here the diffusive re-acceleration couples the evolution of relativistic particles to the gas perturbations. In the near future, deep radio observations, especially at low frequencies, can probe such mechanisms in galaxy clusters.
description: 22 pages, 20 figures, A & A, in press
Non-equilibrium Sachdev-Ye-Kitaev model with quadratic perturbation
Creators: name: Lunkin, A. V.
name: Feigel'man, M. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a non-equilibrium generalization of the mixed SYK$_4$+SYK$_2$ model and calculate the energy dissipation rate $W(ω)$ that results due to periodic modulation of random quadratic matrix elements with a frequency $ω$. We find that $W(ω)$ possesses a peak at $ω$ close to the polaron energy splitting $ω_R$ found recently (PRL 125, 196602), demonstrating the physical significance of this energy scale. Next, we study the effect of energy pumping with a finite amplitude at the resonance frequency $ω_R$ and calculate, in presence of this pumping, non-equilibrium dissipation rate due to low-frequency parametric modulation. We found an unusual phenomenon similar to "dry friction" in presence of pumping.
description: Submission to SciPost 21 pages, 2 figures
Study of Drell-Yan dimuon production in proton-lead collisions at $\sqrt{s_\mathrm{NN}} =$ 8.16 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Differential cross sections for the Drell-Yan process, including Z boson production, using the dimuon decay channel are measured in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of 8.16 TeV. A data sample recorded with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 173 nb$^{-1}$. The differential cross section as a function of the dimuon mass is measured in the range 15-600 GeV, for the first time in proton-nucleus collisions. It is also reported as a function of dimuon rapidity over the mass ranges 15-60 GeV and 60-120 GeV, and ratios for the p-going over the Pb-going beam directions are built. In both mass ranges, the differential cross sections as functions of the dimuon transverse momentum $p_\mathrm{T}$ and of a geometric variable $ϕ^*$ are measured, where $ϕ^*$ highly correlates with $p_\mathrm{T}$ but is determined with higher precision. In the Z mass region, the rapidity dependence of the data indicate a modification of the distribution of partons within a lead nucleus as compared to the proton case. The data are more precise than predictions based upon current models of parton distributions.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-18-003 (CMS Public Pages)