cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Extreme Properties Of GRB061007: A Highly Energetic Or A Highly Collimated Burst?
Creators: name: Schady, P.
name: De Pasquale, M.
name: Page, M. J.
name: Vetere, L.
name: Pandey, S. B.
name: Wang, X. Y.
name: Cummings, J.
name: Zhang, B.
name: Zane, S.
name: Breeveld, A.
name: Burrows, D. N.
name: Gronwall, N. Gehrels. C.
name: Hunsberger, S.
name: Markwardt, C.
name: Mason, K. O.
name: Meszaros, P.
name: Norris, J. P.
name: Oates, S. R.
name: Pagani, C.
name: Poole, T. S.
name: Roming, P. W. A.
name: Smith, P. J.
name: Berk, D. E. Vanden
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: GRB061007 is the brightest gamma-ray burst (GRB) to be detected by Swift and is accompanied by an exceptionally luminous afterglow that had a V-band magnitude <11.1 at 80s after the prompt emission. From the start of the Swift observations the afterglow decayed as a power law with a slope of α_X=1.66+/-0.01 in the X-ray and α_{opt}=1.64+/-0.01 in the UV/optical, up to the point that it was no longer detected above background in the optical or X-ray bands. The brightness of this GRB and the similarity in the decay rate of the X-ray, optical and gamma-ray emission from 100s after the trigger distinguish this burst from others and present a challenge to the fireball model. The lack of a cooling or jet break in the afterglow up to \~10^5s constrains any model that can produce the large luminosity observed in GRB061007, which we found to require either an excessively large kinetic energy or highly collimated outflow. Analysis of the multi-wavelength spectral and high-resolution temporal data taken with Swift suggest an early time jet-break to be a more plausible scenario. This must have occurred within 80s of the prompt emission, which places an upper limit on the jet opening angle of θ_j=0.8deg. Such a highly collimated outflow resolves the energy budget problem presented in a spherical emission model, reducing the isotropic equivalent energy of this burst to E_γ^{corr}=10^{50} ergs; consistent with other GRBs.
description: Accepted by MNRAS, 11 pages, 3 figures
Importance Sampling Scheme for the Stochastic Simulation of Quantum Spin Dynamics
Creators: name: De Nicola, Stefano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The numerical simulation of dynamical phenomena in interacting quantum systems is a notoriously hard problem. Although a number of promising numerical methods exist, they often have limited applicability due to the growth of entanglement or the presence of the so-called sign problem. In this work, we develop an importance sampling scheme for the simulation of quantum spin dynamics, building on a recent approach mapping quantum spin systems to classical stochastic processes. The importance sampling scheme is based on identifying the classical trajectory that yields the largest contribution to a given quantum observable. An exact transformation is then carried out to preferentially sample trajectories that are close to the dominant one. We demonstrate that this approach is capable of reducing the temporal growth of fluctuations in the stochastic quantities, thus extending the range of accessible times and system sizes compared to direct sampling. We discuss advantages and limitations of the proposed approach, outlining directions for further developments.
description: Submission to SciPost, v2; 9 + 2 pages, 5 figures
title: Studi sul Sette-Ottocento offerti a Marinella Colummi
Creators: name: Tamiozzo, Silvana
name: Fornasiero, Serena
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2015

description: ￼Gli interventi qui raccolti sono l'omaggio di un gruppo di studiosi e amici che hanno condiviso negli anni con Marinella Colummi alcuni interessi di ricerca. Aperto e chiuso da due lettere 'speciali', il volume ha seguito un’impostazione comparatistica sette-ottocentesca in linea con i suoi studi. Nievo, autore centrale in tutto il suo curriculum, si trova dunque in dialogo con scrittori e contesti diversi da Alfieri e Foscolo a George Eliot e Zola, in un susseguirsi di proposte critiche che vanno lette anche come un invito alla dedicataria a proseguire nella sua fruttuosa ricerca.
description: Italianistica, volume 1
Dynamics and rheology of a dilute suspension of vesicles: higher order theory
Creators: name: Danker, Gerrit
name: Biben, Thierry
name: Podgorski, Thomas
name: Verdier, Claude
name: Misbah, Chaouqi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Vesicles under shear flow exhibit various dynamics: tank-treading ($tt$), tumbling ($tb$) and vacillating-breathing ($vb$). A consistent higher order theory reveals a direct bifurcation from $tt$ to $tb$ if $C_a\equiv τ\dotγ$ is small enough ($τ$= vesicle relaxation time towards equilibrium shape, $\dotγ$=shear rate). At larger $C_a$ the $tb$ is preceded by the $vb$ mode. For $C_a\gg 1$ we recover the leading order original calculation, where the $vb$ mode coexists with $tb$. The consistent calculation reveals several quantitative discrepancies with recent works, and points to new features. We analyse rheology and find that the effective viscosity exhibits a minimum at $tt-tb$ and $tt-vb$ bifurcation points.
description: 4 pages, 5 figures
title: Ανάπτυξη περιοχών οργανωμένης δόμησης υπό την επίδραση του πολιτικού καθεστώτος: Η περίπτωση του Βουκουρεστίου
title: Development of organized building areas under the influence of the political regime: The case of Bucharest
Creators: name: Παπαλλη Αριανα-Αριστη
Publisher: name: Technical University of Crete
Year: 2024

description: Στην ερευνητική αυτή αναλύεται ο τρόπος που αναπτύχθηκε η πόλη του Βουκουρεστίου υπό την εγκαθίδρυση του Κομμουνιστικού Καθεστώτος, μετά την λήξη του Β’ Παγκόσμιου Πολέμου. Κύριος στόχος της εξουσίας, ήταν η εκτεταμένη ανοικοδόμηση και ο εκσυγχρονισμός των υποδομών. Ειδικότερα στον οικιστικό τομέα, μεγάλη προσοχή δόθηκε στην ανοικοδόμηση των κατεστραμμένων από τους βομβαρδισμούς οικισμών και περιοχών, με την ανοικοδόμηση δεκάδων χιλιάδων κτιρίων. Στην συνέχεια, αναλύονται 12 τυπολογίες κατοικιών με βάση τα τετραγωνικά, τους χώρους και τον τρόπο ανάπτυξης στο εσωτερικό τους. Οι τυπολογίες αυτές επιλέχθηκαν λόγω του ότι ήταν αντιπροσωπευτικές κάθε περιόδου και παρατίθενται με άξονα την χρονολογία κατά την οποία αναπτύχθηκαν. Τέλος, επιλέγονται να εξεταστούν συγκεκριμένες περιοχές οι οποίες συγκεντρώνουν αντιπροσωπευτικά δείγματα των μαζικών κατοικιών.
Isochronal synchronization of delay-coupled systems
Creators: name: Schwartz, Ira B.
name: Shaw, Leah B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We consider small network models for mutually delay-coupled systems which typically do not exhibit stable isochronally synchronized solutions. We show that for certain coupling architectures which involve delayed self feedback to the nodes, the oscillators become isochronally synchronized. Applications are shown for both incoherent pump coupled lasers and spatio-temporal coupled fiber ring lasers.
description: 5 pages, accepted for publication in Physical Review E
Some Remarks on the Location of Non-Asymptotic Zeros of Whittaker and Kummer Hypergeometric Functions
Creators: name: Boussaada, Islam
name: Mazanti, Guilherme
name: Niculescu, Silviu-Iulian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: This paper focuses on the location of the non-asymptotic zeros of Whittaker and Kummer confluent hypergeometric functions. Based on a technique by E. Hille for the analysis of solutions of some second-order ordinary differential equations, we characterize the sign of the real part of zeros of Whittaker and Kummer functions and provide estimates on the regions of the complex plane where those zeros can be located. Our main result is a correction of a previous statement by G. E. Tsvetkov whose propagation has induced mistakes in the literature. In particular, we review some results of E. B. Saff and R. S. Varga on the error of Pad{é}'s rational approximation of the exponential function, which are based on the latter.
title: Remembering Andrej Tarkovskij
title: Un poeta del sogno e dell'immagine
titleType: Subtitle
Creators: name: Borin, Fabrizio
name: Giurlando, Davide
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2014

description: La raccolta di saggi di questo volume completa il progetto Tarkovskiana promosso dall’Università Ca’ Foscari Venezia, dal Centro di Studi sulle Arti della Russia (CSAR), dal Circuito Cinema del Comune di Venezia e dedicato al regista russo Andrej Tarkovskij (1932-1986) per celebrarne gli ottant’anni dalla nascita. Il volume raccoglie riflessioni critiche su un poeta del cinema spirituale che si qualifica non solo in quanto potente e rigoroso regista, ma anche originale innovatore e raffinato artista della crisi della storia culturale dell’Occidente novecentesco. In anticipazione, a suo modo profetica, di quella del presente secolo.
description: La prospettiva rovesciata | Obratnaja perspektiva, volume 1
Gym-ANM: Reinforcement Learning Environments for Active Network Management Tasks in Electricity Distribution Systems
Creators: name: Henry, Robin
name: Ernst, Damien
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: I.2.11; I.2.8

description: Active network management (ANM) of electricity distribution networks include many complex stochastic sequential optimization problems. These problems need to be solved for integrating renewable energies and distributed storage into future electrical grids. In this work, we introduce Gym-ANM, a framework for designing reinforcement learning (RL) environments that model ANM tasks in electricity distribution networks. These environments provide new playgrounds for RL research in the management of electricity networks that do not require an extensive knowledge of the underlying dynamics of such systems. Along with this work, we are releasing an implementation of an introductory toy-environment, ANM6-Easy, designed to emphasize common challenges in ANM. We also show that state-of-the-art RL algorithms can already achieve good performance on ANM6-Easy when compared against a model predictive control (MPC) approach. Finally, we provide guidelines to create new Gym-ANM environments differing in terms of (a) the distribution network topology and parameters, (b) the observation space, (c) the modelling of the stochastic processes present in the system, and (d) a set of hyperparameters influencing the reward signal. Gym-ANM can be downloaded at https://github.com/robinhenry/gym-anm.
description: 15 main pages, 17 pages of appendix, 10 figures, GitHub repository: https://github.com/robinhenry/gym-anm
Unification of topological invariants in Dirac models
Creators: name: von Gersdorff, Gero
name: Panahiyan, Shahram
name: Chen, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Topological phases of materials are characterized by topological invariants that are conventionally calculated by different means according to the dimension and symmetry class of the system. For topological materials described by Dirac models, we introduce a wrapping number as a unified approach to obtain the topological invariants in arbitrary dimensions and symmetry classes. Given a unit vector that parametrizes the momentum-dependence of the Dirac model, the wrapping number describes the degree of the map from the Brillouin zone torus to the sphere formed by the unit vector that we call Dirac sphere. This method is gauge-invariant and originates from the intrinsic features of the Dirac model, and moreover places all known topological invariants, such as Chern number, winding number, Pfaffian, etc, on equal footing.
description: 10 pages, 2 figure
A search for radio pulsars around low-mass white dwarfs
Creators: name: van Leeuwen, Joeri
name: Ferdman, Robert D.
name: Meyer, Sol
name: Stairs, Ingrid
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Low-mass white dwarfs can either be produced in low-mass X-ray binaries by stable mass transfer to a neutron star, or in a common-envelope phase with a heavier white dwarf companion. We have searched 8 low-mass white dwarf candidates recently identified in the Sloan Digital Sky Survey for radio pulsations from pulsar companions, using the Green Bank Telescope at 340MHz. We have found no pulsations down to flux densities of 0.6-0.8 mJy/kpc^2 and conclude that a given low-mass helium-core white dwarf has a probability of < 0.18+-0.05 of being in a binary with a radio pulsar.
description: 4 pages, accepted for publication in MNRAS
title: «Una raffinata ragnatela»
title: Carlo Della Corte tra letteratura e giornalismo nel secondo Novecento italiano
titleType: Subtitle
Creators: name: Gobbato, Veronica
name: Uroda, Silvia
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2014

description: Il volume, curato da Veronica Gobbato e Silvia Uroda, raccoglie gli atti della giornata di studio (5 dicembre 2012, presso il Palazzo Franchetti dell'Istituto Veneto di Scienze, Lettere ed Arti) organizzata dal Centro Interuniversitario di Studi veneti per celebrare la creazione del Fondo Carlo Della Corte presso l'Archivio CISVe-«Carte del Contemporaneo».
description: Quaderni Veneti. Studi e ricerche, volume 1
TIBBIYOTDA TALABALARNING  YUVENIL REVMATOID ARTRIT, ETIOPATOGENEZI TASHXIS KASALLIKLARIDA BO'G'IMLARNING ANATOMIK VA FUNKSIONAL DAVOLASHNING METODIK XUSUSIYATLARI
Creators: name: Normatov, Jasur
Publisher: name: Zenodo
Year: 2024

description: Maqolada tibbiyotda talabalarning  yuvenil revmatoid artrit, etiopatogenezi tashxis kasalliklarida bo‘g‘imlarning anatomik va funksional davolashning metodik xususiyatlari, yuvenil revmatoid artrit, etiopatogenezi tashxis mezonlarini qiyosiy tashxis, davolash usullari, profilaktikasi hamda revmatizmning tarqalishi, hozirgi vaqtda kasallinishning davolash yo‘llari, kasallanish etiologiya va patogenezi, infeksion faktorlar bilan bog‘liqligi haqida fikr yuritilgan.
Development of a DNA probe for detection of nuclear polyhedrosis virus in the forest tent caterpillar Malacosoma disstria Hbn
Creators: name: Kukan, Barbara
Publisher: name: University of British Columbia
Year: 2009

description: Many species of forest Lepidoptera show eight to twelve year population cycles. Viral disease could explain characteristics of population fluctuations in forest tent caterpillars (FTC) Malacosoma disstria Hbn. Until now, virus detection relied on microscopic exam ination for polyhedra of virus in smears of caterpillars or other potentially contaminated material on stained microscope slides. The main objective of this thesis was to develop an efficient detection system for nuclear polyhedrosis virus (NPV) of FTC in the form of a NPV DNA probe. Pure DNA was isolated from virions of the western tent caterpillar, digested with BamHI, and a 2,000 bp fragment which hybridized to the polyhedrin gene of Autographa californica NPV cloned into pGEM then purified for use as a probe. Samples of FTC from a peak density population in the vicinity of Prince George B.C. were tested for presence of virus using both detection systems, the DNA hybridization to a NPV DNA probe, and microscopic examination for polyhedra. Results showed variation between the two techniques but no consistent trend toward one technique showing more or fewer infected individuals. Large sample sizes are necessary to overcome this variation. Because it is much easier to process large sample sizes with the DNA probe its benefits are evident. Distribution of virus in the Prince George population of tent caterpillars was examined. Samples of different life stages of FTC adults, larvae, pupae, egg masses as well as FTC parasitoids were tested with the DNA probe. Some individuals of all stages and parasitoids gave positive responses to the DNA probe with adults and parasitoids showing a particularly high frequency of infection. Egg mass and parasitoid contamination could play a role in transmission of the virus. Transmission of virus was tested by feeding caterpillars virus and testing adults which survived and emerged for the presence of NPV. A high proportion of adults gave positive results. A higher proportion of smaller caterpillars were positive for NPV in six of eight comparisons of large and small caterpillars from the same populations. This suggests that the virus might reduce growth of the infected caterpillar or that smaller caterpillars die before they reach large size which reduces the proportion of infected individuals among large caterpillars. A comparison of large egg masses (many eggs) and small egg masses (few eggs) showed that fewer small egg masses were contaminated with NPV. The cause of this variation is unclear, but this relationship could be crucial to the interpretation of changes in egg mass size in field populations and requires further study.
On bipartite pure-state entanglement structure in terms of disentanglement
Creators: name: Herbut, Fedor
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Schroedinger's disentanglement [E. Schroedinger, Proc. Cambridge Phil. Soc. 31, 555 (1935)], i. e., remote state decomposition, as a physical way to study entanglement, is carried one step further with respect to previous work in investigating the qualitative side of entanglement in any bipartite state vector. Remote measurement (or, equivalently, remote orthogonal state decomposition) from previous work is generalized to remote linearly-independent complete state decomposition both in the non-selective and the selective versions. The results are displayed in terms of commutative square diagrams, which show the power and beauty of the physical meaning of the (antiunitary) correlation operator inherent in the given bipartite state vector. This operator, together with the subsystem states (reduced density operators), constitutes the so-called correlated subsystem picture. It is the central part of the antilinear representation of a bipartite state vector, and it is a kind of core of its entanglement structure. The generalization of previously elaborated disentanglement expounded in this article is a synthesis of the antilinear representation of bipartite state vectors, which is reviewed, and the relevant results of Cassinelli et al. [J. Math. Analys. and Appl., 210, 472 (1997)] in mathematical analysis, which are summed up. Linearly-independent bases (finite or infinite) are shown to be almost as useful in some quantum mechanical studies as orthonormal ones. Finally, it is shown that linearly-independent remote pure-state preparation carries the highest probability of occurrence. This singles out linearly-independent remote influence from all possible ones.
description: 41 page, 2 diagrams
MOESM5 of A lil3 chlp double mutant with exclusive accumulation of geranylgeranyl chlorophyll displays a lethal phenotype in rice
Creators: name: Li, Chunmei
name: Liu, Xin
name: Pan, Jihong
name: Guo, Jia
name: Wang, Qian
name: Chen, Congping
name: Li, Na
name: Zhang, Kuan
name: Yang, Bin
name: Sun, Changhui
name: Deng, Xiaojian
name: Wang, Pingrong
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Developmental Biology
subject: Plant Biology
subject: Computational Biology

description: Additional file 5: Table S3. Comparison of pigment contents in leaves of the 637ys and 502ys mutants and their wild-type ZH11 and Nipponbare between two different light-intensity treatments, in mg g fresh weightâ â 1 (PDF 421 kb)
Gate-controlled supercurrent in epitaxial Al/InAs nanowires
Creators: name: Elalaily, Tosson
name: Kürtössy, Olivér
name: Scherübl, Zoltán
name: Berke, Martin
name: Fülöp, Gergő
name: Lukács, István Endre
name: Kanne, Thomas
name: Nygård, Jesper
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Makk, Péter
name: Csonka, Szabolcs
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Gate-controlled supercurrent (GCS) in superconductor nanobridges has recently attracted attention as a means to create superconducting field effect transistors. Despite the clear advantage for applications with low power consumption and high switching speeds, the microscopic mechanism of the field effect is still under debate. In this work, we realize GCS for the first time in an epitaxial superconductor, which is created as a shell on an InAs nanowire. We show that the supercurrent in the epitaxial Al layer can be switched to the normal state by applying $\simeq\pm$ 23$\,$V on a bottom gate insulated from the nanowire by a crystalline hBN layer. Our extensive study on the temperature and magnetic field dependencies of GCS suggests that hot electron injection alone cannot explain our experimental findings.
title: La valutazione delle lingue straniere e seconde nella scuola
title: Dalla teoria alla pratica
titleType: Subtitle
Creators: name: Novello, Alberta
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2014

description: Caratteristiche, metodologie e motivi della valutazione dell'insegnamento delle lingue straniere a scuola.
description: SAIL, volume 4
Democratic Deconsolidation in Developed Democracies, 1995-2018
Creators: name: Foa, Roberto Stefan
name: Mounk, Yascha
Publisher: name: Harvard Center for European Studies
Year: 2019
Subjects: democratic consolidation
democracy
democratic backsliding
comparative survey research

description: Until recently, many political scientists had believed that the stability of democracy is assured once certain threshold conditions – prosperity, democratic legitimacy, the development of a robust civil society – were attained. Democracy would then be consolidated, and remain stable. In this article we show that levels of support for democratic governance are not stable over time, even among high-income democracies, and have declined in recent years. In contrast to theories of democratic consolidation, we suggest that just as democracy can come to be “the only game in town” through processes of democratic deepening and the broad-based acceptance of democratic institutions, so too a process of democratic deconsolidation can take place as citizens sour on democratic institutions, become more open to authoritarian alternatives, and vote for anti-system parties. Public opinion measures of democratic deconsolidation are strongly associated with subsequent declines in the actual extent of democratic governance and predict not only recent democratic backsliding in transitional democracies, such as Venezuela or Russia, but also anticipated the downgrades in Freedom House scores occurring across a range of western democracies since 2016.
Nuclear shadowing in the light-cone dipole approach
Creators: name: Nemchik, Jan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study nuclear shadowing at small Bjorken x < 0.01 in the color dipole approach. Such a light-cone quantum-chromodynamics formalism based on the Green function technique incorporates naturally color transparency and coherence length effects. The nuclear shadowing for the barq-q Fock component of the photon is calculated using exact numerical solution of the evolution equation for the Green function. At x < 0.01 we demonstrate that a contribution of higher Fock states containing gluons to overall nuclear shadowing becomes effective. Numerical results for nuclear shadowing are compared with available data from the E665 and NMC collaborations. Model calculations are finally tested with the results obtained from other models.
description: 16 pages, 5 figures, talk given at the Workshop on High-pT Physics at LHC (LHC07), Jyvaskyla, Finland, 23-27 Mar 2007. Published in PoS(LHC07)028
Coupled-channels effects in elastic scattering and near-barrier fusion induced by weakly bound nuclei and exotic halo nuclei
Creators: name: Beck, C.
name: Keeley, N.
name: Diaz-Torres, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The influence on fusion of coupling to the breakup process is investigated for reactions where at least one of the colliding nuclei has a sufficiently low binding energy for breakup to become an important process. Elastic scattering, excitation functions for sub-and near-barrier fusion cross sections, and breakup yields are analyzed for $^{6,7}$Li+$^{59}$Co. Continuum-Discretized Coupled-Channels (CDCC) calculations describe well the data at and above the barrier. Elastic scattering with $^{6}$Li (as compared to $^{7}$Li) indicates the significant role of breakup for weakly bound projectiles. A study of $^{4,6}$He induced fusion reactions with a three-body CDCC method for the $^6$He halo nucleus is presented. The relative importance of breakup and bound-state structure effects on total fusion is discussed.
description: 29 pages, 9 figures
IFRS 9: Εφαρμογή και επιπτώσεις του νέου λογιστικού προτύπου. Η υιοθέτησή του από τα ελληνικά πιστωτικά ιδρύματα και οι προβλέψεις απομείωσης δανείων
Creators: name: Τάντου, Ευαγγελία Τρύφωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: ΔΠΧΠ 9
Προβλέψεις απομείωσης δανείων
Πιστωτικά ιδρύματα
IFRS 9
Impairment and loan loss provisions
Credit institutions

description: Η λογιστική παρακολούθηση των χρηματοοικονομικών μέσων και κυρίως των προβλέψεων απομείωσής τους υπήρξε πάντα αμφιλεγόμενη και αποδέκτης πολλών επικρίσεων, φαινόμενο το οποίο εντάθηκε κατά την οικονομική κρίση του 2008. Αναπόφευκτα, οδηγηθήκαμε στη θέσπιση νέων λογιστικών κανόνων και πρακτικών στο πλαίσιο του ΔΠΧΠ 9. Η παρούσα μελέτη επιχειρεί να προβλέψει τις επιπτώσεις της εφαρμογής του ΔΠΧΠ 9 στον ελληνικό χρηματοπιστωτικό τομέα, επικεντρώνοντας την ερευνητική προσπάθεια στην απόδοση ενός εννοιολογικού μοντέλου πρόβλεψης της μεταβλητότητας στην απομείωση των δανείων. Τα ευρήματα της έρευνας υποδεικνύουν ότι οι ελληνικές τράπεζες παρουσιάζουν κυρίως προκυκλική συμπεριφορά, με τάσεις εξομάλυνσης των κερδών και επηρεασμού της κεφαλαιακής τους επάρκειας, χωρίς όμως σημαντική στατιστική διαφοροποίηση πριν και μετά τη λογιστική μεταρρύθμιση. Ωστόσο, υφίστανται στατιστικά βάσιμες ενδείξεις ότι το μοντέλο των αναμενόμενων ζημιών μπορεί να συμβάλλει στο σταδιακό περιορισμό της προκυκλικότητας, ενδυναμώνοντας την αξιοπιστία των εγχώριων συστημικών τραπεζών
description: The accounting of the financial instruments and, particularly, impairment and loan loss provisions have always been controversial and the subject of many criticisms, especially during the financial crisis of 2008. Inevitably, new accounting rules were introduced under IFRS 9. In this paper, we examine the implications of IFRS 9 on the Greek financial sector, focusing the research effort on the performance of a conceptual forecasting model for loan loss provisions. Research findings suggest that Greek banks are predominantly pro-cyclical, with a trend of income smoothing and managing capital adequacy, but without significant differentiation before and after the accounting reform. However, there are valid indications that the expected credit loss approach may gradually contribute to the reduction of pro-cyclicality, strengthening the credibility of domestic systemic banks
MOESM2 of Cecal microbiome profile altered by Salmonella enterica, serovar Enteritidis inoculation in chicken
Creators: name: Liu, Liying
name: Lin, Lili
name: Zheng, Linna
name: Tang, Hui
name: Fan, Xinzhong
name: Xue, Nianguo
name: Li, Min
name: Liu, Min
name: Li, Xianyao
Publisher: name: figshare
Year: 2018
Subjects: subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Physiology
subject: Biotechnology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 2. Principal component analysis for samples in the control group.
Determination of ground state properties in quantum spin systems by single qubit unitary operations and entanglement excitation energies
Creators: name: Giampaolo, S. M.
name: Illuminati, F.
name: Verrucchi, P.
name: De Siena, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We introduce a method for analyzing ground state properties of quantum many body systems, based on the characterization of separability and entanglement by single subsystem unitary operations. We apply the method to the study of the ground state structure of several interacting spin-1/2 models, described by Hamiltonians with different degrees of symmetry. We show that the approach based on single qubit unitary operations allows to introduce {\it ``entanglement excitation energies''}, a set of observables that can characterize ground state properties, including the quantification of single-site entanglement and the determination of quantum critical points. The formalism allows to identify the existence and location of factorization points, and a purely quantum {\it ``transition of entanglement''} that occurs at the approach of factorization. This kind of quantum transition is characterized by a diverging ratio of excitation energies associated to single-qubit unitary operations.
description: To appear in Phys. Rev. A
British unemployment policy in the 1920’s : a re-appraisal of Revolution of Reason and We Can Conquer Unemployment
Creators: name: Caulfield, Peter
Publisher: name: University of British Columbia
Year: 2008

description: Following a short postwar boom, the British economy fell into a long period of uneven growth. The single biggest symptom of interwar economic transition was the unprecedented phenomenen of persistent mass unemployment, concentrated in the export staple industries. This thesis re-evaluates two important contributions to the debate on unemployment policy in the 1920s, by political mavericks Oswald Mosley, of the Labour party, and David Lloyd George, of the Liberals. Each produced small but pithy books on unemployment: respectively, Revolutiony Reason, and Courp.jployment. Most of the historiography to date on the subject has been overly lieconomicu in its orientation, and lacking in historical context. The thesis argues for another interpretation of the two books.. It looks more deeply into the political and social environment in which the programs were developed, and focusses on the “positive” rather than the “normative” dimension of their economics. It will examine what Lloyd George and Oswald Mosley were trying to accomplish in their programs, and why the programs took the forms they did. It will also, for the first time, explicitly compare the two programs, The comparative approach will show just how different their policies were, an important aspect overlooked by the existing literature..
Quantum criticality, lines of fixed points, and phase separation in doped two-dimensional quantum dimer models
Creators: name: Papanikolaou, Stefanos
name: Luijten, Erik
name: Fradkin, Eduardo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study phase diagrams of a class of doped quantum dimer models on the square lattice with ground-state wave functions whose amplitudes have the form of the Gibbs weights of a classical doped dimer model. In this dimer model, parallel neighboring dimers have attractive interactions, whereas neighboring holes either do not interact or have a repulsive interaction. We investigate the behavior of this system via analytic methods and by Monte Carlo simulations. At zero doping, we confirm the existence of a Kosterlitz-Thouless transition from a quantum critical phase to a columnar phase. At low hole densities we find a dimer-hole liquid phase and a columnar phase, separated by a phase boundary which is a line of critical points with varying exponents. We demonstrate that this line ends at a multicritical point where the transition becomes first order and the system phase separates. The first-order transition coexistence curve is shown to become unstable with respect to more complex inhomogeneous phases in the presence of direct hole-hole interactions. We also use a variational approach to determine the spectrum of low-lying density fluctuations in the dimer-hole fluid phase.
description: New and vastly expanded version of the original letter; 31 pages, 8 sections, 2 appendices, 19 figures, 86 references, new abstract. Final published version on Phys. Rev. B
Periodic solutions of second order Hamiltonian systems bifurcating from infinity
Creators: name: Fura, J.
name: Rybicki, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 37J45, 37G45

description: The goal of this article is to study closed connected sets of periodic solutions, of autonomous second order Hamiltonian systems, emanating from infinity. The main idea is to apply the degree for SO(2)-equivariant gradient operators defined by the second author. Using the results due to Rabier we show that we cannot apply the Leray-Schauder degree to prove the main results of this article. It is worth pointing out that since we study connected sets of solutions, we also cannot use the Conley index technique and the Morse theory.
description: 24 pages
Self-consistent analytical solution of a problem of charge-carrier injection at a conductor/insulator interface
Creators: name: Neumann, F.
name: Genenko, Y. A.
name: Melzer, C.
name: Yampolskii, S. V.
name: von Seggern, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a closed description of the charge carrier injection process from a conductor into an insulator. Common injection models are based on single electron descriptions, being problematic especially once the amount of charge-carriers injected is large. Accordingly, we developed a model, which incorporates space charge effects in the description of the injection process. The challenge of this task is the problem of self-consistency. The amount of charge-carriers injected per unit time strongly depends on the energy barrier emerging at the contact, while at the same time the electrostatic potential generated by the injected charge- carriers modifies the height of this injection barrier itself. In our model, self-consistency is obtained by assuming continuity of the electric displacement and the electrochemical potential all over the conductor/insulator system. The conductor and the insulator are properly taken into account by means of their respective density of state distributions. The electric field distributions are obtained in a closed analytical form and the resulting current-voltage characteristics show that the theory embraces injection-limited as well as bulk-limited charge-carrier transport. Analytical approximations of these limits are given, revealing physical mechanisms responsible for the particular current-voltage behavior. In addition, the model exhibits the crossover between the two limiting cases and determines the validity of respective approximations. The consequences resulting from our exactly solvable model are discussed on the basis of a simplified indium tin oxide/organic semiconductor system.
description: 23 pages, 6 figures, accepted to Phys.Rev. B
A posteriori goal-oriented bounds for the Poisson problem using potential and equilibrated flux reconstructions: application to the hybridizable discontinuous Galerkin method
Creators: name: Pares, Nuria
name: Nguyen, Ngoc-Cuong
name: Diez, Pedro
name: Peraire, Jaume
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a general framework to compute upper and lower bounds for linear-functional outputs of the exact solutions of the Poisson equation based on reconstructions of the field variable and flux for both the primal and adjoint problems. The method is devised from a generalization of the complementary energy principle and the duality theory. Using duality theory, the computation of bounds is reduced to finding independent potential and equilibrated flux reconstructions. A generalization of this result is also introduced, allowing to derive alternative guaranteed bounds from nearly-arbitrary H(div;Ω) flux reconstructions (only zero-order equilibration is required). This approach is applicable to any numerical method used to compute the solution. In this work, the proposed approach is applied to derive bounds for the hybridizable discontinuous Galerkin (HDG) method. An attractive feature of the proposed approach is that superconvergence on the bound gap is achieved, yielding accurate bounds even for very coarse meshes. Numerical experiments are presented to illustrate the performance and convergence of the bounds for the HDG method in both uniform and adaptive mesh refinements.
Two-dimensional periodic waves in a supersonic flow of a Bose-Einstein condensate
Creators: name: El, G. A.
name: Gladush, Yu. G.
name: Kamchatnov, A. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Stationary periodic solutions of the two-dimensional Gross-Pitaevskii equation are obtained and analyzed for different parameter values in the context of the problem of a supersonic flow of a Bose-Einstein condensate past an obstacle. The asymptotic connections with the corresponding periodic solutions of the Korteweg-de Vries and nonlinear Schrödinger equations are studied and typical spatial wave distributions are discussed.
description: 11 pages, no figures
Ποιότητα Εργαλείων Αυτοματοποιημένου Ηλεκτρονικού Σχεδιασμού
Creators: name: Γεωργουλόπουλος, Νικόλαος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Ποιότητα
Ικανοποίηση Χρήστη
Εργαλεία Αυτοματοποιημένου Ηλεκτρονικού Σχεδιασμού
Quality
User Satisfaction
Electronic Design Automation Tools

description: Η επιτυχία των εργαλείων αυτοματοποιήμενου ηλεκτρονικού σχεδιασμού (electronic design automation – EDA tools) αποτελεί κρίσιμο στοιχείο για τις επιχειρήσεις που έχουν ως κύρια δραστηριότητα το σχεδιασμό ηλεντρονικών συστημάτων, όπως τα ολοκληρωμένα κυκλώματα ή οι πλακέτες τυπωμένου κυκλώματος. Όπως και τα υπόλοιπα πληροφοριακά συστήματα, η επιτυχία τους βασίζεται κυρίως στην ποιότητα συστήματος, την ποιότητα υπηρεσιών, την ποιότητα πληροφοριών και την ικανοποίηση χρήστη. Σε αυτή την εργασία, μελετάται ο βαθμός ικανοποίησης του χρήστη εργαλείων EDA σε σχέση με το βαθμό ποιότητας συστήματος, ποιότητας υπηρεσιών και ποιότητας πληροφοριών. Η μεθοδολογία της έρευνας είναι ποσοτική και περιλαμβάνει τα εξής βήματα: καθορισμός ερευνητικού προβλήματος, βιβλιογραφική ανασκόπηση, ανάπτυξη ερευνητικών υποθέσεων, διεξαγωγή έρευνας με ερωτηματολόγιο, στατιστική ανάλυση των αποτελεσμάτων και σύγκρισή τους με τις ερευνητικές υποθέσεις. Τα αποτελέσματα υπέδειξαν ότι υψηλότερη ποιότητα συστήματος, υπηρεσιών και πληροφοριών οδηγούν σε μεγαλύτερη ικανοποίηση του χρήστη εργαλείων EDA
description: Electronic Design Automation (EDA) tools success constitutes a critical element for the enterprises that their main activity is electronic systems design, such as integrated circuits or printed circuit boards. Like any other type of information system, their success is based mostly on system quality, service quality, information quality and user satisfaction. In this work, the level of the EDA tools’ user satisfaction is studied relatively to the levels of the EDA tools’ system quality, service quality and information quality. The research methodology is quantitative and consists of the following steps: definition of the research problem, literature review, research hypotheses development, research execution with questionnaire, statistical analysis of the results and comparisons with the research hypotheses. The results displayed that higher levels of system quality, service quality and information quality of an EDA tool lead to greater user satisfaction
Dye-Sensitized Nanostructured TiO2 Film Based Photoconductor
Creators: name: Kallioinen, Jani
name: Hassan, M. R.
name: Paraoanu, G. S.
name: Korppi-Tommola, Jouko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Grooves were etched in a conductive layer of a conductive, transparent glass, and a nanoporous TiO2 film was deposited on both the conductive and nonconductive area. The width of the grooves was 100 $μ$m and 150 $μ$m. A transparent TiO2 film was dye-sensitized, covered with an electrolyte, and sandwiched with a cover glass. The conductivity of the dye-sensitized TiO2 film permeated with electrolyte was studied in the dark and under illumination, and was observed to be dependent on light intensity, wavelength and applied voltage. This study shows that dye-sensitized nanoporous films can be used as a wavelength dependent photoconductor.
description: 11 pages, 5 figures
Viscous magnetotransport and Gurzhi effect in bilayer electron system
Creators: name: Gusev, G. M.
name: Jaroshevich, A. S.
name: Levin, A. D.
name: Kvon, Z. D.
name: Bakarov, A. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We observe a large negative magnetoresistance and a decrease of resistivity with increasing temperature, known as the Gurzhi effect, in a bilayer electron (BL) system formed by a wide GaAs quantum well. A hydrodynamic model for the single fluid transport parameters in narrow channels is employed and successfully describes our experimental findings. We find that the electron-electron scattering in the bilayer is more intensive in comparison with a single-band well (SW). The hydrodynamic assumption implies a strong dependence on boundary conditions, which can be characterized by slip length, describing the behavior of a liquid near the edge. Our results reveal that slip length in a BL is shorter than in a SW, and that the BL system goes deeper into the hydrodynamic regime. This is in agreement with the model proposed where the slip length is of the order of the electron-electron mean free path.
description: 8 pages, 8 figures
Quenched invariance principle for multidimensional ballistic random walk in a random environment with a forbidden direction
Creators: name: Rassoul-Agha, Firas
name: Seppäläinen, Timo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K37, 60F17, 82D30 (Primary)

description: We consider a ballistic random walk in an i.i.d. random environment that does not allow retreating in a certain fixed direction. We prove an invariance principle (functional central limit theorem) under almost every fixed environment. The assumptions are nonnestling, at least two spatial dimensions, and a $2+ε$ moment for the step of the walk uniformly in the environment. The main point behind the invariance principle is that the quenched mean of the walk behaves subdiffusively.
description: Published at http://dx.doi.org/10.1214/009117906000000610 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Establishment of Kifilideen coefficient tables for positive and negative powers of n and −n of Kifilideen trinomial theorem and other development based on matrix and standardized methods
Creators: name: Osanyinpeju, Kifilideen
Publisher: name: Ptolemy Institute of Scientific Research and Technology (PISRT), Pakistan
Year: 2023

description: https://pisrt.org/psr-press/journals/oms-vol-7-2023/establishment-of-kifilideen-coefficient-tables-for-positive-and-negative-powers-of-n-and-n-of-kifilideen-trinomial-theorem-and-other-development-based-on-matrix-and-standardized-methods/
Confined Vortex Surface and Irreversibility. 1. Properties of Exact solution
Creators: name: Migdal, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We revise the steady vortex surface theory following the recent finding of asymmetric vortex sheets (AM,2021). These surfaces avoid the Kelvin-Helmholtz instability by adjusting their discontinuity and shape. The vorticity collapses to the sheet only in an exceptional case considered long ago by Burgers and Townsend, where it decays as a Gaussian on both sides of the sheet. In generic asymmetric vortex sheets (Shariff,2021), vorticity leaks to one side or another, making such sheets inadequate for vortex sheet statistics and anomalous dissipation. We conjecture that the vorticity in a turbulent flow collapses on a special kind of surface (confined vortex surface, or CVS), satisfying some equations involving the tangent components of the local strain tensor. The most important qualitative observation is that the inequality needed for this solution's stability breaks the Euler dynamics' time reversibility. We interpret this as dynamic irreversibility. We have also represented the enstrophy as a surface integral, conserved in the Navier-Stokes equation in the turbulent limit, with vortex stretching and viscous diffusion terms exactly canceling each other on the CVS surfaces. We have studied the CVS equations for the cylindrical vortex surface for an arbitrary constant background strain with two different eigenvalues. This equation reduces to a particular version of the stationary Birkhoff-Rott equation for the 2D flow with an extra nonanalytic term. We study some general properties of this equation and reduce its solution to a fixed point of a map on a sphere, guaranteed to exist by the Brouwer theorem.
description: 19 pages, 1 figure. Modified CVS theory, with a totally different solution for the surface
Η επίδραση του επαναληπτικού μάρκετινγκ μέσω των Google AdWords στις επιχειρήσεις
Creators: name: Λούβαρη, Βικτωρία Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Επαναληπτική στόχευση
Επαναληπτικό μάρκετινγκ
Διαδικτυακή διαφήμιση
Retargeting
Remarketing
AdWords

description: Απώτερος σκοπός της εργασίας είναι να αναγνωρίσει ποιος τρόπος στόχευσης είναι αποτελεσματικότερος αλλά και τους παράγοντες σχεδιασμού που επιδρούν θετικά στην εκπλήρωση των στόχων των διαδικτυακών διαφημίσεων. Με τελικό στόχο να απαντηθεί το ερώτημα αν «το λεκτικό περιεχόμενο των διαφημίσεων επηρεάζει την αποτελεσματικότητα τους» πρόκειται να τεθούν δύο υποθέσεις που θα αποδειχτούν αναλύοντας τα αποτελέσματα της έρευνας. Η μελέτη διεξάγεται χρησιμοποιώντας δεδομένα της επιχείρησης «Ήλιος» με μοναδικό σκοπό την δημιουργία διαφήμισης Google
description: The aim of the present thesis is to identify which targeting method is more effective, but also the design factors that have a positive effect on the fulfillment of the goals of online advertising. With the ultimate goal of answering the question of whether "the verbal content of advertisements affects their effectiveness", two hypotheses will be made and by analyzing the results of the survey the one will be proven. The study is conducted using company’s “Ilios” data for the purpose of creating a Google ad