cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ο ρόλος της αξίας φίρμας και της διαδικασίας επανόρθωσης στην ικανοποίηση του καταναλωτή σε μια ενδεχόμενη παροχή ελαττωματικής υπηρεσίας: μία ποιοτική προσέγγιση
Creators: name: Πατσαρίκας, Αχιλλέας Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Αξία φίρμας
Διαδικασία επανόρθωσης
Αποτυχία Υπηρεσίας
Brand Equity
Service Recovery
Service Failure

description: Η εργασία αυτή έρχεται να μελετήσει και να πραγματευτεί δύο πολυσύνθετες έννοιες, ευρέως αναγνωρισμένες στην διεθνή βιβλιογραφία, που σταδιακά αρχίζουν να γίνονται αναπόσπαστο τμήμα της στρατηγικής κάθε εταιρείας που δραστηριοποιείται στον τομέα των υπηρεσιών. Πρόκειται για την αξία φίρμας και την διαδικασία επανόρθωσης, δύο όρους στενά αλληλοσχετιζόμενους και αλληλένδετους, που αν εφαρμοστούν και χρησιμοποιηθούν κατάλληλα θα προσδώσουν ένα ισχυρό πλεονέκτημα στην επιχείρηση. Συγκεκριμένα, στόχος της παρούσας εργασίας είναι να διαπιστωθεί ο ρόλος και η λειτουργία της εκάστοτε διαδικασίας στην ικανοποίηση ενός απογοητευμένου πελάτη μετά την ενδεχόμενη αποτυχία της προσφερόμενης υπηρεσίας. Για την προσέγγιση του θέματος, στο ερευνητικό σκέλος επιλέχθηκε η χρήση ποιοτικών μεθόδων συγκέντρωσης και ανάλυσης των δεδομένων. Τα συμπεράσματα που εξάχθηκαν επιβεβαίωσαν προηγούμενες έρευνες αλλά συγχρόνως πρόσθεσαν και νέες παρατηρήσεις. Νέα δεδομένα ανέδειξαν τον ρόλο της αξίας φίρμας στην σχέση μεταξύ σοβαρότητας αποτυχίας της υπηρεσίας και ικανοποίησης του πελάτη.
description: The thesis comes to study two complex concepts, widely recognized in the literature, which gradually have become an integral part of the strategy of each company engaged in the service sector. It is about brand equity and recovery process, two terms closely interrelated and interdependent, which if implemented and used properly will give a strong advantage in a business. Specifically, the aim of this study is to determine the role and function of each process on customer’s post-satisfaction after a service failure. At the research part, the researcher chose to use qualitative methods to collect and analyze data. The conclusions drawn from those results confirmed previous research but also add new comments. New data highlighted the role of brand equity in the relationship between severity of service failure and customer satisfaction.
A Simultaneous Optical and X-ray Variability Study of the Orion Nebula Cluster. I. Incidence of Time-Correlated X-ray/Optical Variations
Creators: name: Stassun, Keivan G.
name: Berg, M. van den
name: Feigelson, Eric
name: Flaccomio, Ettore
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a database of $BVRI$ time-series photometry of the Orion Nebula Cluster obtained with two ground-based telescopes at different longitudes to provide simultaneous coverage with the 13-d Chandra observation of the cluster. The resulting database of simultaneous optical and X-ray light curves for some 800 pre--main-sequence (PMS) stars represents, by a factor of hundreds, the largest synoptic, multi--wavelength-regime, time-series study of young stars to date. This database will permit detailed analyses of the relationship between optical and X-ray variability among a statistically significant ensemble of PMS stars, with the goal of elucidating the origins of PMS X-ray production. In this first paper, we present the optical observations, describe the combined X-ray/optical database, and perform an analysis of time-correlated variability in the optical and X-ray light curves. We identify 40 stars (representing 5% of our study sample) with possible time-correlated optical and X-ray variability. Examples of both positive and negative time-correlations are found, possibly representing X-ray flares and persistent coronal features associated with both cool and hot surface spots (i.e. magnetically active regions and accretion shocks). We also find two possible examples of "white-light" flares coincident with X-ray flares; these may correspond to the impulsive heating phase in solar-analog flares. However, though interesting, these represent unusual cases. More generally, we find very little evidence to suggest a direct causal link between the sources of optical and X-ray variability in PMS stars. The conclusion that accretion is a primary driver of X-ray production in PMS stars is not supported by our findings.
description: 69 pages, 46 figures, accepted by ApJ
Additional file 1 of Prevalence and determinants of persistent symptoms after treatment for Lyme borreliosis: study protocol for an observational, prospective cohort study (LymeProspect)
Creators: name: Vrijmoeth, Hedwig D.
name: Ursinus, Jeanine
name: Harms, Margriet G.
name: Tizza P. Zomer
name: Gauw, Stefanie A.
name: Tulen, Anna D.
name: Kremer, Kristin
name: Sprong, Hein
name: Knoop, Hans
name: Vermeeren, Yolande M.
name: Kooten, Barend Van
name: Joosten, Leo A. B.
name: Bart-Jan Kullberg
name: Hovius, Joppe W. R.
name: Wijngaard, Cees C. Van Den
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Neuroscience
subject: Pharmacology
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: 110309 Infectious Diseases

description: Table S1. Clinical and laboratory criteria for inclusion of patients with confirmed Lyme borreliosis. Clinical and laboratory inclusion criteria for patients with confirmed Lyme borreliosis are described in detail. Criteria are largely based on case definitions published by Stanek et al. and alternative causes for symptoms should be excluded by the primary caregiver 4. *The CXCL-13 cut-off value is laboratory dependent. #As determined by neurological assessment or electromyogram. ^Preferably through synovial fluid puncture or synovium biopsy. �ter a cardiologist has been consulted. (DOCX 17 kb)
Swinging and Tumbling of Fluid Vesicles in Shear Flow
Creators: name: Noguchi, Hiroshi
name: Gompper, Gerhard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The dynamics of fluid vesicles in simple shear flow is studied using mesoscale simulations of dynamically-triangulated surfaces, as well as a theoretical approach based on two variables, a shape parameter and the inclination angle, which has no adjustable parameters. We show that between the well-known tank-treading and tumbling states, a new ``swinging'' state can appear. We predict the dynamic phase diagram as a function of the shear rate, the viscosities of the membrane and the internal fluid, and the reduced vesicle volume. Our results agree well with recent experiments.
description: 4 pages, 4 figures
An examination of the role of local government in coastal zone management: the case of Richmond, B.C.
Creators: name: Pernu, James Victor
Publisher: name: University of British Columbia
Year: 2009

description: The management of the coastal zone is a complex task facing all three levels of Canadian Government. While academic research and public attention tend to focus on federal and provincial agencies, the role of local government has been left largely unexplored. This thesis examines the role of local government in coastal zone management in British Columbia and evaluates local government’s contribution to the management of the coastal zone based on the performance of local planning policies in the coastal community of Richmond, B.C. Coastal zone management (C.Z.M.) is a specialized subset of contemporary resource management models having three hierarchically integrated components representing biophysical, socio-economic and institutional subsystems. A literature review yielded many management issues of which seven were selected to reflect the local government experience in C.Z.M. The seven issues are: Habitat Conservation, Water Quality, Coastal Hazards, Public Access and Aesthetics, Public Input, Water Dependency and Interjurisdictional Coordination. The evaluation of Richmond’s C.Z.M. policies was undertaken using a methodology similar to those employed by Rosentraub (1975) and Jessen et al. (1983). A retrospective analysis of Development Permit Application files processed between 1988 and 1991 was employed in the evaluation of existing policies contained within Richmond’s Official Community Plan. While the exact extent of local responsibilities remains poorly defined by existing legislation, local regulatory powers in C.Z.M. were determined to be nonetheless significant. The British Columbia Municipal Act provided a considerable amount of regulatory authority for each of the seven coastal zone management issues, namely in the form of Zoning bylaws, Official Community Plan bylaws and Development Permits. The findings indicate that Richmond’s existing policies displayed limited effectiveness concerning the management of C.Z.M. issues such as Habitat Conservation, Water Quality, Coastal Hazards and Interjurisdictional Coordination. However, the results also suggested that local policies addressing coastal zone issues such as public access and aesthetics were effective. Furthermore, explicit policies for Water Dependency and Public Input were non existent. Several recommendations were made in this thesis. The first is an expanded recognition of C.Z.M. as a local government concern and responsibility. Further recommendations include increased interjurisdictional involvement, greater public access to waterfront surrounding industrial sites and discouraging the pressure to develop in the floodplain.
Comment on 'Helmholtz theorem and the v-gauge in the problem of superluminal and instantaneous signals in classical electrodynamics,' by Chubykalo et al [Found. of Phys. Lett, 19, 37-46 (2006)]
Creators: name: Heras, Jose A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Fundamental errors in the Chubykalo et al paper [Found. of Phys. Lett, 19, 37-46 (2006)] are highlighted. Contrary to their claim that "... the irrotational component of the electric field has a physical meaning and can propagate exclusively instantaneously," it is shown that this instantaneous component is physically irrelevant because it is always canceled by a term contained into the solenoidal component. This result follows directly from the solution of the wave equation that satisfies the solenoidal component. Therefore the subsequent inference of these authors that there are two mechanisms of transmission of energy and momentum in classical electrodynamics, one retarded and the other one instantaneous, has no basis. The example given by these authors in which the full electric field of an oscillating charge equals its instantaneous irrotational component on the axis of oscillations is proved to be false.
description: An alternative discussion can be found in the paper: Jose A. Heras, "How potentials in different gauges yield the same retarded electric and magnetic fields," Am. J. Phys. 75, 176-183 (2007)
Αξιολόγηση Νανοσωματιδίων Fe/MgO για Απομάκρυνση Αρσενικού
Creators: name: Τρεσίντση, Σοφία Γρηγορίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Αρσενικό
Νανοσωματίδια
Προσρόφηση
Arsenic
Nanoparticles
Adsorption

description: Στην παρούσα μεταπτυχιακή διατριβή εξετάζεται η απόδοση μαγνητικών νανοσωματιδίων με δομή πυρήνα φλοιού Fe/MgO στην απομάκρυνση αρσενικού από το αλκαλικό ρεύμα αναγέννησης των συμβατικών προσροφητικών (υδροξύ-οξειδίων σιδήρου). Το ρεύμα αναγέννησης αποτελείται από αλκαλικό διάλυμα, συνήθως NaOH, το οποίο είναι ικανό να εκπλένει από τα υδροξύ-οξείδια σιδήρου το αρσενικό το οποίο δεσμεύτηκε κατά τη διάρκεια της προσρόφησης. Πιο συγκεκριμένα, εξετάζεται η απόδοση τους σε υψηλές τιμές pH (10 με 12). Μετά τη διαδικασίας της προσρόφησης η απομάκρυνση τους θα πραγματοποιείται με χρήση κατάλληλης συσκευής μαγνητικού διαχωρισμού με σκοπό την ανακύκλωση του ρεύματος αναγέννησης. Συμπερασματικά η χρήση των νανοσωματιδίων μειώνει την τοξικότητα του ρεύματος αναγέννησης το οποίο πλέον μπορεί να ανακυκλώνεται συνεχώς στο σύστημα μειώνοντας επιπλέον το κόστος επεξεργασίας του πόσιμου νερού.
description: This thesis examines the performance of magnetic nanoparticles with core shell structure Fe/MgO in removing arsenic from the alkaline regeneration stream of conventional adsorbents (iron oxy-hydroxides). Regeneration stream is an alkaline solution, usually NaOH, able to remove arsenic from iron oxy-hydroxides which was bounded during the adsorption process. More specifically, examines their performance at high pH values (10 to 12). After the adsorption process removal of nanoparticles will be carried out using a magnetic separation device in order to recycle the regeneration stream. In conclusion the use of nanoparticles reduces toxicity of the regeneration stream which now may be continuously recycled in the system, by reducing further water treatment cost.
Spectral Signatures of Population III and Envelope-stripped Stars in Galaxies at the Epoch of Reionization
Creators: name: Berzin, Elizabeth
name: Secunda, Amy
name: Cen, Renyue
name: Menegas, Alexander
name: Götberg, Ylva
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: While most simulations of the epoch of reionization have focused on single-stellar populations in star-forming dwarf galaxies, products of binary evolution are expected to significantly contribute to emissions of hydrogen-ionizing photons. Among these products are stripped stars (or helium stars), which have their envelopes stripped from interactions with binary companions, leaving an exposed helium core. Previous work has suggested these stripped stars can dominate the LyC photon output of high-redshift low luminosity galaxies. Other sources of hard radiation in the early universe include zero-metallicity Population III stars, which may have similar SED properties to galaxies with radiation dominated by stripped star emissions. Here, we use two metrics (the power-law exponent over wavelength intervals 240-500 Å, 600-900 Å, and 1200-2000 Å, and the ratio of total luminosity in FUV wavelengths to LyC wavelengths) to compare the SEDs of simulated galaxies with only single-stellar evolution, galaxies containing stripped stars, and galaxies containing Population III stars, with four different IMFs. We find that stripped stars significantly alter the SEDs in the LyC range of galaxies at the epoch of reionization. SEDs in galaxies with stripped stars present have lower power-law indices in the LyC range and lower FUV to LyC luminosity ratios. These differences in SEDs are present at all considered luminosities ($M_{UV} > -15$, AB system), and are most pronounced for lower luminosity galaxies. We also find that SEDs of galaxies with stripped stars and Pop III stars are distinct from each other for all tested IMFs.
description: 16 pages, 9 figures. Accepted to ApJ
A Monte Carlo Generator for Full Simulation of e+e- to hadrons Cross section Scan Experiment
Creators: name: Zhang, D.
name: Gang, R.
name: Chen, J. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A generator with $α^2$ order radiative correction effects, including both the initial state radiative corrections and the photon vacuum polarization corrections, is built for the full simulation of $e^+e^- \to hadrons $ in cross section scan experiment in the quarkonium energy region. The contributions from the hadron production structures including the resonances of $1^{--}$ quarkonium families and the light hadrons spectrum below 2 GeV as well as the QED continuum hadron spectrum are all taken into account in the event generation. It was employed successfully to determine the detection efficiency for selection of the events of $e^+e^-\to hadrons$ from the data taken in the energy region from 3.650 GeV to 3.872 GeV covering both the $ψ(3686)$ and $ψ(3770)$ resonances in BES experiment. The generator reproduces the properties of hadronic event production and inclusive decays well.
Additional file 1 of Early gestational mesenchymal stem cell secretome attenuates experimental bronchopulmonary dysplasia in part via exosome-associated factor TSG-6
Creators: name: Chaubey, Sushma
name: Thueson, Sam
name: Devasena Ponnalagu
name: Alam, Mohammad Afaque
name: Gheorghe, Ciprian P.
name: Zubair Aghai
name: Singh, Harpreet
name: Bhandari, Vineet
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Physiology
subject: Pharmacology
subject: Biotechnology
subject: Developmental Biology
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Supplementary experimental procedures. Table S1. Comparison of different parameters in the exosome dose. Table S2. Clinical data for BPD and No BPD (n = 10). Figure S1. Preterm hUCs MSCs, but not fibroblasts, improve the BPD pulmonary phenotype. i.p. injections of MSCs from preterm (32 weeks) hUCs, in our mouse BPD model, at PN2 and PN4 showed improvement in lung architecture (at PN14), as evidenced by decreased chord length compared to the BPD mice. Human primary dermal fibroblast (HDF) cells, injected as control cells in the BPD mice, demonstrated no difference as compared to BPD mice. All values are expressed as mean ± standard deviation (SD); four experiments, N = 3 mice per group; one-way ANOVA with Tukey’s post hoc correction; *p
Hierarchy of Geometrical Frustration in Elastic Ribbons: shape-transitions and energy scaling obtained from a general asymptotic theory
Creators: name: Levin, Ido
name: Siéfert, Emmanuel
name: Sharon, Eran
name: Maor, Cy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Geometrically frustrated elastic ribbons exhibit, in many cases, significant changes in configuration depending on the relation between their width and thickness. We show that the existence of such a transition, and the scaling at which it occurs, strongly depend on the system considered. Using an asymptotic approach, treating the width as a small parameter, we find the leading energy terms resulting from the frustration and predict the existence and scaling of the shape transition. We study in detail 5 different types of frustrated ribbons with a different morphological dependence on ribbon's width: a sharp shape-transition at a critical width, a moderate transition with an intermediate regime, and no transition at all. We show that the predictions of our approach match experimental results from two different experimental systems: prestressed rubber bilayers and 4D printed thermoplastics, in a wide variety of geometric settings.
description: 24 pages, 8 figures, 2 appendices
Deep Unsupervised Learning for Joint Antenna Selection and Hybrid Beamforming
Creators: name: Liu, Zhiyan
name: Yang, Yuwen
name: Gao, Feifei
name: Zhou, Ting
name: Ma, Hongbing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we propose a novel deep unsupervised learning-based approach that jointly optimizes antenna selection and hybrid beamforming to improve the hardware and spectral efficiencies of massive multiple-input-multiple-output (MIMO) downlink systems. By employing ResNet to extract features from the channel matrices, two neural networks, i.e., the antenna selection network (ASNet) and the hybrid beamforming network (BFNet), are respectively proposed for dynamic antenna selection and hybrid beamformer design. Furthermore, a deep probabilistic subsampling trick and a specially designed quantization function are respectively developed for ASNet and BFNet to preserve the differentiability while embedding discrete constraints into the network structures. With the aid of a flexibly designed loss function, ASNet and BFNet are jointly trained in a phased unsupervised way, which avoids the prohibitive computational cost of acquiring training labels in supervised learning. Simulation results demonstrate the advantage of the proposed approach over conventional optimization-based algorithms in terms of both the achieved rate and the computational complexity.
description: Accepted by IEEE Transactions on Communications
Additional file 1 of The addition of vildagliptin to metformin prevents the elevation of interleukin 1ß in patients with type 2 diabetes and coronary artery disease: a prospective, randomized, open-label study
Creators: name: Younis, Arwa
name: Eskenazi, Dana
name: Goldkorn, Ronen
name: Leor, Jonathan
name: Naftali-Shani, Nili
name: Fisman, Enrique Z.
name: Tenenbaum, Alexander
name: Goldenberg, Ilan
name: Klempfner, Robert
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology

description: Additional file 1: Table S1. Showing the percentage change {Δ% = [(value after treatment - baseline value)/baseline value * 100]} in each group of patients after 12 weeks of treatment.
Εισοδηματική Σύγκλιση στον Ευρωπαϊκό Χώρο
Creators: name: Σουρή, Ευαγγελία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Κατά Κεφαλήν Εισοδήματα
Σύγκλιση
Οικονομική Μεγέθυνση
Per Capita income
Convergence
Economic Growth

description: Το φαινόμενο της Ευρωπαϊκής σύγκλισης έχει απασχολήσει τόσο την επιστημονική κοινότητα όσο και τους ειδικούς της Ευρωπαϊκής ολοκλήρωσης. Ειδικότερα από την υπογραφή της συνθήκης του Μάαστριχτ και έπειτα η επίτευξη οικονομικής σύγκλισης μεταξύ των κρατών – μελών της Ευρωπαϊκής Ένωσης έχει αναδειχθεί σε ζήτημα μείζονος σημασίας. Στην παρούσα μελέτη επιχειρούμε να απαντήσουμε στο ερώτημα του κατά πόσο υπάρχει σύγκλιση εισοδημάτων στον Ευρωπαϊκό χώρο. Για το σκοπό αυτό επεξεργαζόμαστε στοιχεία για το κατά κεφαλήν εισόδημα 23 χωρών της ΕΕ (συν της Ελβετίας) για την περίοδο μεταξύ 1970 και 2010. Για τον έλεγχο της σύγκλισης χρησιμοποιούμε περισσότερες από μία μεθοδολογικές προσεγγίσεις γεγονός που μας επιτρέπει να εξετάσουμε τόσο το φαινόμενο της β και σ – σύγκλισης όσο και την ύπαρξη στοχαστικής σύγκλισης μεταξύ των χωρών του δείγματός μας. Η μη ταύτιση των εμπειρικών αποτελεσμάτων των διαφόρων μεθοδολογιών μας οδηγεί σε αδυναμία εξαγωγής ενός καθολικού συμπεράσματος παρόλο που η τάση φαίνεται να είναι θετική ως προς την ύπαρξη σύγκλισης στον Ευρωπαϊκό χώρο.
description: The specialists of European integration as well as the experts of growth economics have been investigating the issue of income convergence in Europe since the establishment of the European community took place. Especially from 1992 onwards when the Maastricht treaty was signed, the achievement of economic convergence among the member – states of the European Union became a primary aim. In this essay we attempt to answer whether the phenomenon of income convergence is present among EU countries or not. We employ data for per capita income of 23 EU Member – States plus Switzerland for the period between 1970 and 2010. We apply more than one methodology in order to test for several notions of convergence and come up with a more credible conclusion. More specifically we test for b – convergence, sigma convergence as well as for stochastic convergence. The heterogeneity of empirical findings with respect to each methodology makes us argue that there is no universal conclusion to the issue of European convergence. Nevertheless, one could not fail to observe that there is a clear trend towards convergence among the EU countries.
Schreiben im DaF-Unterricht: analyse von Schülertexten
Creators: name: Ζούμπου, Ελένη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Λειτουργική-πραγματολογία
Στρατηγικές
ΚΠΓ
Functional-pragmatics
Strategies
KPG exams

description: Η παρούσα εργασία έγινε με σκοπό να αναλύσει τον τρόπο δράσης των μαθητών της γερμανικής ως ξένης γλώσσας στον γραπτό λόγο, όταν καλούνται να ανταπεξέλθουν σε μια συγκεκριμένη επικοινωνιακή πράξη. Παράλληλα εντοπίστηκαν οι στρατηγικές που χρησιμοποιήθηκαν προκειμένου να επιτύχουν τον επικοινωνιακό τους στόχο. Πρόκειται για μια μελέτη περίπτωσης που αφορά κείμενα της γραπτής δοκιμασίας στο επίπεδο Β1 στα πλαίσια μαθημάτων προετοιμασίας για τις εξετάσεις του ΚΠΓ. Στο σώμα γραπτών κείμενων ανιχνεύθηκαν συγκεκριμένα χαρακτηριστικά του λόγου των μαθητών (λεκτικά χαρακτηριστικά, στρατηγικές διαμεσολάβησης και επικοινωνίας) και έγιναν διαπιστώσεις για τη διδακτική της ξένης γλώσσας και την βελτίωση του γραπτού λόγου των μαθητών.
description: The present study attempts to analyze the communicative strategic competence of learners who learn German as a foreign Language, when asked to handle a particular communicative act. A focus is made on their ability to use different strategies in order to achieve the communication objective. This is a case study on written texts produced by German learners attending preparation courses for the examination of the KPG (State Certificate of Foreign Language in German, B1 level). A corpus of task based written texts was put together in order to trace pragmatic competence and communication strategies. Eventually the findings of this study can be used in the foreign language teaching environment in order to improve the writing skills of students.
A detailed modelling of the chemically rich clumps along the CB3 outflow
Creators: name: Benedettini, Milena
name: Yates, Jeremy A.
name: Viti, Serena
name: Codella, Claudio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In order to investigate the origin and the structure of the low velocity, chemically rich clumps observed along the lobes of low- and intermediate-mass outflows, we construct a detailed model of the S1 clump along the CB3 outflow. We use a time-dependent chemical model coupled with a radiative transfer model to reproduce the observed line profile for a direct comparison with previous observations of this clump. We find that the simultaneous fitting of multiple species and transitions is a powerful tool in constraining the physical parameters of the gas. Different scenarios for the clump formation have been investigated. The models that better reproduce all the observed lines are those where the clump is formed, at least partially, before the advent of the outflow; with the advent of the outflow the clump undergoes a short period of non-dissociative shock and the consequent release of the icy mantle together with the high temperature chemistry leads to the observed chemical enrichment. Our results also suggest the presence of substructure within the clump: a more extended component traced by CS, SO and the lower energy transitions (3_k-2_k and 2_k-1_k) of CH_3OH, and a more compact component traced by H_2CO, SO_2 and the higher energy transitions (5_k-4_k) of CH_3OH.
description: 11 pages, 9 figures, accepted by MNRAS
Stochastic variational principles for the collisional Vlasov-Maxwell and Vlasov-Poisson equations
Creators: name: Tyranowski, Tomasz M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Computational Physics (physics.comp-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q83, 35Q61, 35Q70, 35Q84, 49Q99, 82C31, 82C40, 60H07, 60H30,

description: In this work we recast the collisional Vlasov-Maxwell and Vlasov-Poisson equations as systems of coupled stochastic and partial differential equations, and we derive stochastic variational principles which underlie such reformulations. We also propose a stochastic particle method for the collisional Vlasov-Maxwell equations and provide a variational characterization of it, which can be used as a basis for a further development of stochastic structure-preserving particle-in-cell integrators.
description: 29 pages
Purely radiative irrotational dust spacetimes
Creators: name: Bergh, N Van den
name: Bastiaensen, B
name: Karimian, H R
name: Wylleman, L
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider irrotational dust spacetimes in the full non-linear regime which are "purely radiative" in the sense that the gravitational field satisfies the covariant transverse conditions div(H) = div(E) = 0. Within this family we show that the Bianchi class A spatially homogeneous dust models are uniquely characterised by the condition that $H$ is diagonal in the shear-eigenframe.
description: 6 pages, ERE 2006 conference, minor corrections
Συνοπτικός κατάλογος του περιεχομένου των ελληνικών χειρογράφων της Ιεράς Μονής Ιβήρων του Αγίου Όρους
Creators: name: Μπάτσιος, Βασίλειος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Κατάλογος
Χειρόγραφα
Μονή Ιβήρων
List
Manuscripts
Monastery of Iviron

description: Σκοπός της παρούσης εργασίας ήταν η σύνταξη καταλόγου μέρους της συλλογής ελληνικών χειρογράφων της Ιεράς Μονής Ιβήρων του Αγίου Όρους. Η σύνταξη του καταλόγου βασίστηκε σε μέρος της συλλογής μικροταινιών της Ιεράς Μονής Ιβήρων του Αγίου Όρους. Στην παρούσα εργασία εξετάζονται οι μικροταινίες με αύξοντα αριθμό 451-500. Η περιγραφή ακολουθεί την εξής σειρά: Στην πρώτη γραμμή δίνεται ο αύξων αριθμός της μικροταινίας και σε παρένθεση ο ταξινομικός αριθμός του χειρογράφου. Στην τρίτη γραμμή αναγράφονται συγκεκομμένα η χρονολόγηση του χειρογράφου, το υλικό του, οι διαστάσεις του σε χιλιοστά, ο αριθμός των φύλλων και των παραφύλλων, ο αριθμός των στηλών (εάν είναι μεγαλύτερος του ενός) και τέλος ο αριθμός των στίχων. Ακολουθεί η λεπτομερής αναγραφή του περιεχομένου (Α) του χειρογράφου. Αυτή άλλωστε αποτέλεσε και τον κύριο στόχο του παρόντος καταλόγου. Για τα αποσπάσματα, η ταύτιση των οποίων στάθηκε αδύνατη, δηλώνεται η αρχή και το τέλος τους. Στο τέλος της ενότητας αυτής σημειώνονται τα άγραφα φύλλα. Μετά τη δήλωση του περιεχομένου παρατίθενται τα βιβλιογραφικά σημειώματα (Β). Η εργασία τελειώνει με δύο αλφαβητικούς πίνακες: α) των συγγραφέων και β) των αντιγραφέων των χειρογράφων.
description: The purpose of this research paper was the creation of a catalogue that portrayed a part of the greek manuscripts that the Holy Monastery of Iviron in Mount Athos, Greece, has in its possession. The catalogue was based on a part of the microfilm collection that the Monastery owns. In this paper are analyzed the following microfilms in serial number from 400-409, 411-428, 435-450. The description consists of the following order: In the first line the serial number of the microfilm is presented and the taxonomic number in a parenthesis. The third line presents the dating of the manuscript, the material of the manuscript, its dimensions, the number of pages, the number of the column and the line number. A detailed description of the manuscript content (A) follows. That was after all the aim of this catalogue. For the fragments that were unable to be identified there is an indication of their beginning and end. In the end of this section blank pages are marked. The paper finishes with two lists in alphabetic order: a) the list of the writers and b) the list of the scriveners.
description: Η πρόσβαση στην ηλεκτρονική μορφή της εργασίας δεν είναι εφικτή
Learning Space Partitions for Path Planning
Creators: name: Yang, Kevin
name: Zhang, Tianjun
name: Cummins, Chris
name: Cui, Brandon
name: Steiner, Benoit
name: Wang, Linnan
name: Gonzalez, Joseph E.
name: Klein, Dan
name: Tian, Yuandong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Path planning, the problem of efficiently discovering high-reward trajectories, often requires optimizing a high-dimensional and multimodal reward function. Popular approaches like CEM and CMA-ES greedily focus on promising regions of the search space and may get trapped in local maxima. DOO and VOOT balance exploration and exploitation, but use space partitioning strategies independent of the reward function to be optimized. Recently, LaMCTS empirically learns to partition the search space in a reward-sensitive manner for black-box optimization. In this paper, we develop a novel formal regret analysis for when and why such an adaptive region partitioning scheme works. We also propose a new path planning method LaP3 which improves the function value estimation within each sub-region, and uses a latent representation of the search space. Empirically, LaP3 outperforms existing path planning methods in 2D navigation tasks, especially in the presence of difficult-to-escape local optima, and shows benefits when plugged into the planning components of model-based RL such as PETS. These gains transfer to highly multimodal real-world tasks, where we outperform strong baselines in compiler phase ordering by up to 39% on average across 9 tasks, and in molecular design by up to 0.4 on properties on a 0-1 scale. Code is available at https://github.com/yangkevin2/neurips2021-lap3.
Page Curve for Entanglement Negativity through Geometric Evaporation
Creators: name: Basak, Jaydeep Kumar
name: Basu, Debarshi
name: Malvimat, Vinay
name: Parihar, Himanshu
name: Sengupta, Gautam
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the entanglement negativity for various pure and mixed state configurations in a bath coupled to an evaporating two dimensional non-extremal Jackiw-Teitelboim (JT) black hole obtained through the partial dimensional reduction of a three dimensional BTZ black hole. Our results exactly reproduce the analogues of the Page curve for the entanglement negativity which were recently determined through diagrammatic technique developed in the context of random matrix theory.
description: 40 pages, 19 figures and 1 appendix; Published version
Numerical method for evolving the Projected Gross-Pitaevskii equation
Creators: name: Blakie, P. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: In this paper we describe a method for evolving the projected Gross-Pitaevskii equation (PGPE) for a Bose gas in a harmonic oscillator potential. The central difficulty in solving this equation is the requirement that the classical field is restricted to a small set of prescribed modes that constitute the low energy classical region of the system. We present a scheme, using a Hermite-polynomial based spectral representation, that precisely implements this mode restriction and allows an efficient and accurate solution of the PGPE. We show equilibrium and non-equilibrium results from the application of the PGPE to an anisotropic trapped three-dimensional Bose gas.
description: 12 pages, 5 figures. To appear in Phys. Rev. E. Convergence results added, a few minor changes made and typos fixed
Cohousing : an alternative approach to dwelling in British Columbia
Creators: name: Williams, Dan
Publisher: name: University of British Columbia
Year: 2009

description: As elsewhere, British Columbia faces a challenge of how to provide livable, affordable, safe housing for all in the face of public funding cuts. Cohousing may provide one solution. This study begins by analyzing various definitions of cohousing, then develops, on the basis of European and local experiences, four definitional criteria for distinguishing cohousing from other shelter options. It is proposed that the term âcohousingâ be limited to housing that involves: joint ownership of common property combined with individual equity in private dwelling units; resident group decisions on design, management, and the shape of common life among the residents; design that facilitates both private living and shared space; and reliance on mainly private rather than public resources. The study then analyzes the potential of cohousing to meet B.C. needs by considering the constraints and opportunities facing its development, under headings derived from the adopted definition of cohousing, namely: organization (legal/financial/group process), design, and government relations. The study primarily draws on interviews with leaders of cohousing projects and government officials related to housing, as well as literature on the experience of other countries with cohousing. Each chapter ends with a strategic checklist for planners in the public or private sphere to consider in their facilitation of cohousing. The concluding chapter draws the constraints and opportunities into the context of the possible future for cohousing in B.C.
A causal look into the quantum Talbot effect
Creators: name: Sanz, A. S.
name: Miret-Artes, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A well-known phenomenon in both optics and quantum mechanics is the so-called Talbot effect. This near field interference effect arises when infinitely periodic diffracting structures or gratings are illuminated by highly coherent light or particle beams. Typical diffraction patterns known as quantum carpets are then observed. Here the authors provide an insightful picture of this nonlocal phenomenon as well as its classical limit in terms of Bohmian mechanics, also showing the causal reasons and conditions that explain its appearance. As an illustration, theoretical results obtained from diffraction of thermal He atoms by both N-slit arrays and weak corrugated surfaces are analyzed and discussed. Moreover, the authors also explain in terms of what they call the Talbot-Beeby effect how realistic interaction potentials induce shifts and distortions in the corresponding quantum carpets.
description: 12 pages, 6 figures
Low charge-noise nitrogen-vacancy centers in diamond created using laser writing with a solid-immersion lens
Creators: name: Yurgens, Viktoria
name: Zuber, Josh A.
name: Flågan, Sigurd
name: De Luca, Marta
name: Shields, Brendan J.
name: Zardo, Ilaria
name: Maletinsky, Patrick
name: Warburton, Richard J.
name: Jakubczyk, Tomasz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on pulsed-laser induced generation of nitrogen-vacancy (NV) centers in diamond facilitated by a solid-immersion lens (SIL). The SIL enables laser writing at energies as low as 5.8 nJ per pulse and allows vacancies to be formed close to a diamond surface without inducing surface graphitization. We operate in the previously unexplored regime where lattice vacancies are created following tunneling breakdown rather than multiphoton ionization. We present three samples in which NV-center arrays were laser-written at distances between ~1 $μ$m and 40 $μ$m from a diamond surface, all presenting narrow distributions of optical linewidths with means between 62.1 MHz and 74.5 MHz. The linewidths include the effect of long-term spectral diffusion induced by a 532 nm repump laser for charge-state stabilization, thereby emphasizing the particularly low charge-noise environment of the created color centers. Such high-quality NV centers are excellent candidates for practical applications employing two-photon quantum interference with separate NV centers. Finally, we propose a model for disentangling power broadening from inhomogeneous broadening in the NV center optical linewidth.
Nonlinear absorption in interacting Rydberg electromagnetically-induced-transparency spectra on two-photon resonance
Creators: name: Tebben, Annika
name: Hainaut, Clément
name: Salzinger, Andre
name: Geier, Sebastian
name: Franz, Titus
name: Pohl, Thomas
name: Gärttner, Martin
name: Zürn, Gerhard
name: Weidemüller, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We experimentally investigate the nonlinear transmission spectrum of coherent light fields propagating through a Rydberg EIT medium with strong atomic interactions. In contrast to previous investigations, which have largely focused on resonant control fields, we explore here the full two-dimensional spectral response of the Rydberg gas. Our measurements confirm previously observed spectral features for a vanishing control-field detuning, but also reveal significant differences on two-photon resonance. In particular, we find qualitative deficiencies of mean-field models and rate-equation simulations as well as a third-order nonlinear susceptibility that accounts for pair-wise interaction effects at low probe-field intensities in describing the nonlinear probe-field response under EIT conditions. Our results suggest that a more complete understanding of Rydberg-EIT and emerging photon interactions requires to go beyond existing simplified models as well as few-photon theories.
Transitions in the wake of a flapping foil
Creators: name: Godoy-Diana, Ramiro
name: Aider, Jean-Luc
name: Wesfreid, José Eduardo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study experimentally the vortex streets produced by a flapping foil in a hydrodynamic tunnel, using 2D Particle Image Velocimetry (PIV). An analysis in terms of a flapping frequency-amplitude phase space allows to identify: 1) the transition from the well-known Bénard-von Kármán (BvK) wake to the reverse BvK vortex street that characterizes propulsive wakes, and 2) the symmetry breaking of this reverse BvK pattern giving rise to an asymmetric wake. We also show that the transition from a BvK wake to a reverse BvK wake precedes the actual drag-thrust transition and we discuss the significance of the present results in the analysis of flapping systems in nature.
description: Revised version includes minor changes in the discussion of the drag coefficient calculation. The 4 figures are unchanged
Conclusions of the Third European Conference on Risk Perception, Behaviour, Management and Response - ECRP 2022
Creators: name: Rufat, Samuel
name: Uhing, Karsten
name: Vollmer, Maike
name: Fekete, Alexander
name: Bianchi, G.
name: Kuhlicke, C.
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2021
Subjects: risk perception
disaster risk management
behaviour
management and repsponse
exposure
survey
vulnerabilty

description: The Third ECRP conference in June 2022 in Berlin, Germany, has gathered again our two communities, the Risk Perception and Behaviour Survey of Surveyors (Risk-SoS) and the H2020-DRS-01 Cluster on risk perception and adaptive behaviour (a grouping of several Horizon Europe - Disaster Resilient Societies projects, most notably RESILOC, BUILDERS, CORE, ENGAGE, LINKS, RiskPACC). One of the key challenges for risk, vulnerability and resilience research is how to address the role of risk perceptions and how perceptions influence behaviour. It remains unclear why people fail to act adaptively to reduce future losses, even when there is ever-richer information available on natural and human-made hazards (flood, drought, etc.). The current fragmentation of the field makes it an uphill battle to cross-validate the results of existing independent case studies. This, in turn, hinders comparability and transferability across scales and contexts and hampers recommendations for policy and risk management. The ECRP conference cycle aims to contribute to improve the ability of researchers in the field to work together and build cumulative knowledge.
Enhancement of Anomalous Boundary Current by High Temperature
Creators: name: Guo, Ruiping
name: Miao, Rong-Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Recently it is found that Weyl anomaly leads to novel anomalous currents in the spacetime with a boundary. However, the anomalous current is suppressed by the mass of charge carriers and the distance to the boundary, which makes it difficult to be measured. In this paper, we explore the possible mechanisms for the enhancement of anomalous currents. Interestingly, we find that the anomalous current can be significantly enhanced by the high temperature, which makes easier the experimental detection. For free theories, the anomalous current is proportional to the temperature in the high temperature limit. Note that the currents can be enhanced by thermal effects only at high temperatures. In general, this is not the case at low temperatures. For general temperatures, the absolute value of the current of Neumann boundary condition first decreases and then increases with the temperature, while the current of Dirichlet boundary condition always increases with the temperature. It should be mentioned that the enhancement does not have an anomalous nature. In fact, the so-called anomalous current in this paper is not always related to Weyl anomaly. Instead, it is an anomalous effect due to the boundary.
description: 16 pages, 6 figures,references added, minor revision accepted for publication in EPJC
Ising analogue to compact-star matter
Creators: name: Napolitani, P.
name: Chomaz, Ph.
name: Gulminelli, F.
name: Hasnaoui, K. H. O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: By constructing an Ising analogue of compact-star matter at sub-saturation density we explored the effect of Coulomb frustration on the nuclear liquid-gas phase transition. Our conclusions is twofold. First, the range of temperatures where inhomogeneous phases form expands with increasing Coulomb-field strength. Second, within the approximation of uniform electron distribution, the limiting point upon which the phase-coexistence region ends does not exhibit any critical behaviour. Possible astrophysics consequences and thermodynamical connections are discussed.
description: 4 pages, 3 figures