cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum Kibble-Zurek mechanism: Kink correlations after a quench in the quantum Ising chain
Creators: name: Nowak, Radosław J.
name: Dziarmaga, Jacek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The transverse field in the quantum Ising chain is linearly ramped from the para- to the ferromagnetic phase across the quantum critical point at a rate characterized by a quench time $τ_Q$. We calculate a connected kink-kink correlator in the final state at zero transverse field. The correlator is a sum of two terms: a negative (anti-bunching) Gaussian that depends on the Kibble-Zurek (KZ) correlation length only and a positive term that depends on a second longer scale of length. The second length is made longer by dephasing of the state excited near the critical point during the following ramp across the ferromagnetic phase. This interpretation is corroborated by considering a linear ramp that is halted in the ferromagnetic phase for a finite waiting time and then continued at the same rate as before the halt. The extra time available for dephasing increases the second scale of length that asymptotically grows linearly with the waiting time. The dephasing also suppresses magnitude of the second term making it negligible for waiting times much longer than $τ_Q$. The same dephasing can be obtained with a smooth ramp that slows down in the ferromagnetic phase. Assuming sufficient dephasing we obtain also higher order kink correlators and the ferromagnetic correlation function.
description: 10 pages; last two paragraphs added in Sec. IX; version to appear in PRB
The marine geochemistry of zirconium and hafnium
Creators: name: McKelvey, Brad Alan
Publisher: name: University of British Columbia
Year: 2009

description: The refractory nature of Zr and Hf has limited the study of these elements in the hydrological cycle. Recent advances in analytical techniques, such as inductively coupled plasma mass spectrometry (ICP/MS), now make this possible. This thesis describes the development of an analytical technique utilizing isotope dilution and ICP/MS to determine picomolar and femtomolar concentrations of dissolved Zr and Hf in seawater and the first detailed concentration profiles of dissolved Zr and Hf in the Pacific and Atlantic Oceans. In addition, the distributions of dissolved Zr and Hfin pore waters collected from coastal sediments will be described. These data mark the first ever measurements of these two ultra-trace elements in marine interstitial waters. The chelating ion-exchange resin, Chelex-100, was found to be suitable for the extraction/concentration step required for the determination of dissolved Zr and Hf in seawater using isotope dilution analysis. The extraction was optimized for pH, flow rate, resin volume, elution volume, and the time required for isotope equilibration. The isotope ratios91 Zr/ 90 Zrand178 HE’ 177 Hf were measured using flow injection ICP/MS. The detection limits for a one litre sample are 0.21 and 0.03 pmoles/kg for Zr and Hf, respectively. The analytical precision (is) of the technique improves with increasing concentration and varies from 2.5 to 7% for Zr and 9 to 22% for Hf Results from a surface transect, samples from 25 m depth, across the North Pacific indicate an input of dissolved Zr and Hf at the ocean margins. This is thought to be a result of a flux of dissolved Zr and Hf from reducing shelf sediments and/or riverine inputs. Oceanographically consistent profiles ofZr and Hfwere obtained for Zr and Hf in the North Pacific and North Atlantic. The profiles of dissolved Zr and Hfreflect a complex combination of biogeochemical controls. Dissolved Zr and Hfhave minimum concentrations of 15-95 and 0.2-0.5 pmoles/kg, respectively, in the surface waters and increase to a maximum of 255-366 and 0.8-1.0 pmoles/kg, respectively, in the deep waters. Maintaining the large dynamic range of dissolved Zr and Hfin the water column requires a combination of surface removal and deep water input. The removal of Zr and Hf in the water column is thought to be a result of particle scavenging, and the input to the deep waters may be from a porewater flux and/or a sediment surface remineralization process. The concentrations of dissolved Zr and Hf in coastal sediment pore waters were found to be an order of magnitude higher than those found in the overlying bottom waters, The pore water profiles ofZr and Hfresembled that of dissolved Fe suggesting that the increases in Zr and Hfconcentrations at shallow depths result from the dissolution of oxide and oxyhydroxide phases during burial.
SATAR: A Self-supervised Approach to Twitter Account Representation Learning and its Application in Bot Detection
Creators: name: Feng, Shangbin
name: Wan, Herun
name: Wang, Ningnan
name: Li, Jundong
name: Luo, Minnan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Twitter has become a major social media platform since its launching in 2006, while complaints about bot accounts have increased recently. Although extensive research efforts have been made, the state-of-the-art bot detection methods fall short of generalizability and adaptability. Specifically, previous bot detectors leverage only a small fraction of user information and are often trained on datasets that only cover few types of bots. As a result, they fail to generalize to real-world scenarios on the Twittersphere where different types of bots co-exist. Additionally, bots in Twitter are constantly evolving to evade detection. Previous efforts, although effective once in their context, fail to adapt to new generations of Twitter bots. To address the two challenges of Twitter bot detection, we propose SATAR, a self-supervised representation learning framework of Twitter users, and apply it to the task of bot detection. In particular, SATAR generalizes by jointly leveraging the semantics, property and neighborhood information of a specific user. Meanwhile, SATAR adapts by pre-training on a massive number of self-supervised users and fine-tuning on detailed bot detection scenarios. Extensive experiments demonstrate that SATAR outperforms competitive baselines on different bot detection datasets of varying information completeness and collection time. SATAR is also proved to generalize in real-world scenarios and adapt to evolving generations of social media bots.
description: accepted at CIKM 2021
TwiBot-20: A Comprehensive Twitter Bot Detection Benchmark
Creators: name: Feng, Shangbin
name: Wan, Herun
name: Wang, Ningnan
name: Li, Jundong
name: Luo, Minnan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Twitter has become a vital social media platform while an ample amount of malicious Twitter bots exist and induce undesirable social effects. Successful Twitter bot detection proposals are generally supervised, which rely heavily on large-scale datasets. However, existing benchmarks generally suffer from low levels of user diversity, limited user information and data scarcity. Therefore, these datasets are not sufficient to train and stably benchmark bot detection measures. To alleviate these problems, we present TwiBot-20, a massive Twitter bot detection benchmark, which contains 229,573 users, 33,488,192 tweets, 8,723,736 user property items and 455,958 follow relationships. TwiBot-20 covers diversified bots and genuine users to better represent the real-world Twittersphere. TwiBot-20 also includes three modals of user information to support both binary classification of single users and community-aware approaches. To the best of our knowledge, TwiBot-20 is the largest Twitter bot detection benchmark to date. We reproduce competitive bot detection methods and conduct a thorough evaluation on TwiBot-20 and two other public datasets. Experiment results demonstrate that existing bot detection measures fail to match their previously claimed performance on TwiBot-20, which suggests that Twitter bot detection remains a challenging task and requires further research efforts.
description: accepted at CIKM 2021
title: Komputerowe stanowisko pomiarowe z układem RLD do pozyskiwania sygnału elektromiograficznego
Creators: name: Krawiecki, Zbigniew
name: Jędrych, Bartłomiej
name: Hulewicz, Arkadiusz
name: Dziarski, Krzysztof
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 51-61
Θεωρητική και Πειραματική Διερεύνηση του Indentation Size Effect
Creators: name: Καμπούρης, Λευτέρης Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Νανοσκληρομέτρηση
Βαθμιδική πλαστικότητα/ελαστικότητα
Φαινόμενο μεγέθους εντύπωσης
Nanoindentation
Gradient plasticity/elasticity
Indentation Size Effect

description: Η παρούσα διπλωματική εργασία πραγματεύεται σε θεωρητικό και πειραματικό επίπεδο την διερεύνηση του Indentation Size Effect (ISE), ενός φαινόμενου μεγέθους που εμφανίζεται στα πειράματα Νανοσκληρομέτρησης σε πολύ μικρά βάθη διείσδυσης. Στο πρώτο κεφάλαιο αναφέρονται κάποιες βασικές έννοιες για την μέθοδο της Νανοσκληρομέτρησης, το θεωρητικό υπόβαθρο, τις τεχνικές που χρησιμοποιούνται αλλά και τους κυριότερους παράγοντες που επηρεάζουν τις μετρήσεις. Στο δεύτερο κεφάλαιο γίνεται μία βιβλιογραφική ανασκόπηση που αφορά τα θεωρητικά μοντέλα που έχουν αναπτυχθεί με βάση το ISE, με ιδιαίτερη αναφορά στις Θεωρίες Βαθμίδων. Στο τρίτο κεφάλαιο, θεωρώντας το ISE ως ένα τεχνητό σφάλμα που προέρχεται από τη γεωμετρία των πρισματικών ακίδων, αναπτύσσεται ένα καινούριο 2D βαθμιδικό μοντέλο πλαστικότητας ικανό να προβλέψει την συμπεριφορά του ISE σε μέταλλα και χάλυβες. Στο τέταρτο κεφάλαιο αναλύεται η πειραματική διαδικασία που ακολουθήθηκε για την διερεύνηση της επίδρασης της γεωμετρίας της πρισματικής ακίδας στην ανάλυση των μηχανικών ιδιοτήτων κάποιων υλικών αναφοράς, αλλά και ενός συστήματος υμενίου – υποστρώματος. Επίσης έγινε προσομοίωση του αξονοσυμμετρικού προβλήματος της νανοσκληρομέτρησης μέσω ενός κώδικα πεπερασμένων στοιχείων αλλά και σύγκριση του μοντέλου με τα πειραματικά δεδομένα. Τέλος παρουσιάζονται τα συμπεράσματα της διπλωματικής εργασίας και προτείνονται ιδέες για περαιτέρω μελέτη
description: This thesis discusses in theoretical and experimental level the investigation of the so-called indentation size effect (ISE), a phenomenon appeared in Nanoindentation experiments in ultra-low penetration depths. In the first chapter, some basic concepts of the Nanoindentation technique are discussed, along with the theoretical background, the methods typically used and the main factors affecting the measurements. In the second chapter, a literature review is conducted, related to the theoretical models that have been developed regarding the ISE, with emphasis in Gradient theories. In the third chapter, ISE observed in the measurements acquired this way, is studied with the use of gradient theory. It is shown that the ISE is rather an artifact of the geometry of the tips used, than a phenomenon related to the material tested. As a result, a novel 2D gradient model is developed, capable of predicting the ISE behavior. In the fourth chapter, the experimental procedure is analyzed in order to investigate the effect of the geometry of the tip in the analysis of the mechanical properties of some control materials, as well as of a thin film-substrate system. Finite Element Analysis (FEA) is also used to model the experimental results of the nanoindentation technique. Finally, the results of this thesis along with some new concepts for further research are demonstrated.
The cohomology of superspace, pure spinors and invariant integrals
Creators: name: Berkovits, N.
name: Howe, P. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The superform construction of supersymmetric invariants, which consists of integrating the top component of a closed superform over spacetime, is reviewed. The cohomological methods necessary for the analysis of closed superforms are discussed and some further theoretical developments presented. The method is applied to higher-order corrections in heterotic string theory up to $\a'^3$. Some partial results on $N=2,d=10$ and $N=1,d=11$ are also given.
description: 24 pages. Minor changes; added references
An investigation of the $α_S$ and heavy quark mass dependence in the MSHT20 global PDF analysis
Creators: name: Cridge, T.
name: Harland-Lang, L. A.
name: Martin, A. D.
name: Thorne, R. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the MSHT20 global PDF sets, demonstrating the effects of varying the strong coupling $α_S(M_Z^2)$ and the masses of the charm and bottom quarks. We determine the preferred value, and accompanying uncertainties, when we allow $α_S(M_Z^2)$ to be a free parameter in the MSHT20 global analyses of deep-inelastic and related hard scattering data, at both NLO and NNLO in QCD perturbation theory. We also study the constraints on $α_S(M_Z^2)$ which come from the individual data sets in the global fit by repeating the NNLO and NLO global analyses at various fixed values of $α_S(M_Z^2)$, spanning the range $α_S(M_Z^2)=0.108$ to $0.130$ in units of $0.001$. We make all resulting PDFs sets available. We find that the best fit values are $α_S(M_Z^2)=0.1203\pm 0.0015$ and $0.1174\pm 0.0013$ at NLO and NNLO respectively. We investigate the relationship between the variations in $α_S(M_Z^2)$ and the uncertainties on the PDFs, and illustrate this by calculating the cross sections for key processes at the LHC. We also perform fits where we allow the heavy quark masses $m_c$ and $m_b$ to vary away from their default values and make PDF sets available in steps of $Δm_c =0.05~{\rm GeV}$ and $Δm_b =0.25~{\rm GeV}$, using the pole mass definition of the quark masses. As for varying $α_S(M_Z^2)$ values, we present the variation in the PDFs and in the predictions. We examine the comparison to data, particularly the HERA data on charm and bottom cross sections and note that our default values are very largely compatible with best fits to data. We provide PDF sets with 3 and 4 active quark flavours, as well as the standard value of 5 flavours.
description: 45 pages, 27 figures, 9 tables. arXiv admin note: text overlap with arXiv:1510.02332, arXiv:1506.05682. Version 3 - published version
Investigating the effects of processing instruction on the acquisition of Russian aspect by Greek learners
Creators: name: Lukianenko, Maryna Gennadiy (Μαρίνα Λουκιανένκο)
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: η Διδασκαλία Βάσει της Γλωσσικής Επεξεργασίας (ΔΒΓΕ)
Το ποιόν ενέργειας στα Ρώσικα
Aπόκτηση Δεύτερης Γλώσσας
Processing Instruction
Russian aspect
Second Language Acquisition

description: Σκοπός της παρούσας μελέτης είναι η διερεύνηση των επιπτώσεων της προσέγγισης Διδασκαλία Βάσει Γλωσσικής Επεξεργασίας (ΔΒΓΕ) (Processing instruction), που στηρίζεται στο γλωσσικό εισαγόμενο, σε σύγκριση με Παραδοσιακή Διδασκαλία (ΠΔ) γραμματικής που στηρίζεται στο γλωσσικό εξερχόμενο στην εκμάθηση του ποιού ενέργειας (συνοπτικό/μη συνοπτικό) στο παρελθόν στα ρωσικά. Συμμετείχαν 22 Έλληνες σπουδαστές της ρωσικής γλώσσας σε κέντρο ξένων γλωσσών στη Θεσσαλονίκη. Οι σπουδαστές χωρίστηκαν σε δύο ομάδες: μια ομάδα ΔΒΓΕ και μια ομάδα ΠΔ. Και στις δύο ομάδες έγινε ρητή διδασκαλία του ποιού ενέργειας στα ρωσικά, αλλά η ομάδα ΔΒΓΕ έλαβε πληροφορίες σχετικά με τις στρατηγικές επεξεργασίας γλωσσικής μορφής καθώς και μια σειρά δραστηριοτήτων Δομημένου Γλωσσικού Εισαγόμενου ενώ η ομάδα ΠΔ διδάχτηκε με τεχνικές βασισμένες στην παραγωγή λόγου. Η αποτελεσματικότητα των διδακτικών παρεμβάσεων ελέγχθηκε με 3 δοκιμασίες κατανόησης και παραγωγής που δόθηκαν στους συμμετέχοντες: (α) πριν τη διδασκαλία, (β) αμέσως μετά τη διδασκαλία και (γ) έναν μήνα αργότερα. Η στατιστική ανάλυση των αποτελεσμάτων έδειξε βελτίωση στη χρήση και κατανόηση του ποιού ενέργειας στα ρωσικά και για τις δύο ομάδες, χωρίς στατιστικά σημαντικές διαφορές μεταξύ τους
description: The present study aims to investigate the possible effects of the input-based approach Processing Instruction (PI) compared with traditional output-based instruction (TI) on the acquisition of Russian aspect (perfective and imperfective distinction) in the past tense. For this study, we selected 22 L1 Greek learners enrolled in a Russian language tuition programme at a private language school in Thessaloniki, Greece. The learners were divided into two groups: a processing instruction (PI) group and a traditional instruction (TI) group. The PI group was provided with explicit instruction about the forms, information about processing strategies and a set of structured input activities. The TI group was also provided with explicit instruction of aspect and underwent a traditional output-based treatment. A pre-test, a post-test and a delayed post-test (one month later) assessing both comprehension and production, were administered to all participant groups. The statistical analysis of the results showed that both the PI group and the TI group had improved after the instructional treatments and that there were no significant differences between the groups. These results are possibly due to methodological constraints and further research involving a larger sample of participants is necessary
Superconducting microresonators for electron spin resonance, the good, the bad, and the future
Creators: name: Artzi, Yaron
name: Yishay, Yakir
name: Fanciulli, Marco
name: Jbara, Moamen
name: Blank, Aharon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The field of electron spin resonance is in constant need to improve its capabilities. Among other things, this means having better resonators which would provide improved spin sensitivity, as well as enable larger microwave magnetic field power conversion factors. Surface micro resonators, made of small metallic patches on a dielectric substrate, provide very good absolute spin sensitivity and high conversion factors due to their very small mode volume. However, such resonators suffer from having a relatively low quality factor, which offsets some of their significant potential advantages. The use of superconducting patches to replace the metallic layer seems like a reasonable and straightforward solution to the quality factor issue, at least for measurements carried out at cryogenic temperatures. Nevertheless, superconducting materials are not easily incorporated into setups requiring high magnetic fields, due to electric current vortices generated in the latter's surface. This makes the transition from normal conducing materials to superconductors highly nontrivial. Here we present the design, fabrication, and testing results of surface micro resonators made of yttrium barium copper oxide (YBCO) superconducting material. We show that with a unique experimental setup, these resonators can be made to operate well even at high fields of about 1.2 T. Furthermore, we analyze the effect of current vortices on the ESR signal and the spins' coherence times. Finally, we provide a head to head comparison of YBCO vs copper resonators of the same dimensions, which clearly shows their pros and cons and directs us to future potential developments and improvements in this field.
NMR studies of solutes in nematic liquid crystals: understanding the nematogens
Creators: name: Ter Beek, Leon Christiaan
Publisher: name: University of British Columbia
Year: 2009

description: NMR spectroscopy and dynamics of small solute molecules dissolved in several nematic liquid crystals provided insights toward a better understanding of nematogens. Expressions for all possible spin-relaxation rates for dideuterium are given. Exper- imentally obtained Zeeman relaxation rates in several liquid crystals were fitted to the expression for the Zeeman relaxation rate, and correlation times were thus obtained. From our study of the dynamics of dideuterium in nematic liquid crystals it was also found that ortho and para dideuterium have different relaxation rates due to the inter- ference of the dipolar and quadrupolar coupling constants and their spectral densities. The Zeeman relaxation rates of dideuterium show no liquid crystal solvent effect. Three different solute molecules with a single bond of rotation have been investigated in a special zero-electric field gradient nematic mixture: furfural, 2-chlorobenzaldehyde, and 2,2’-dithiophene. Dipolar coupling constants measured from NMR experiments are reported for these solutes and discussed in terms of the order parameters and conformer probabilities. In the course of the analysis a new geometry for 2,2’-dithiophene has been found. The spectrum of propane has been analyzed with the use of Multiple-Quantum NMR. Dipolar coupling constants of ethane, propane, benzene, 1 ,3,5-trifluorobenzene, hexaflu- orobenzene, and 1 ,3,5-trichlorobenzene as an internal reference for liquid crystal orient- tation, as solutes in three different nematic liquid crystals, were obtained from NMR spectra. The results are discussed in terms of orientation and solute—solvent interactions and especially the long-range molecular quadrupole moment—mean electric field gradi- ent interaction. A method for obtaining molecular quadrupole moments of solutes in nematic liquid crystals is discussed. The molecular quadrupole moment—mean electric field gradient interaction contributes to the orientation potential of these small alkanes and benzenes and will contribute to the orientation of alkyl chains and aromatic cores of nematogens as well.
Σχολιασμένη μετάφραση (DE, EL) - Αποσπάσματα από το βιβλίο «Λογοτεχνική Μετάφραση» του Γιερν Άλμπρεχτ
Creators: name: Φωτιάδου, Νικολέττα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Σχολιασμένη μετάφραση
Λογοτεχνική μετάφραση
Πολιτισμικές ανταλλαγές
Annotated translation
Literary translation
Cultural exchange

description: Σκοπός της παρούσας μεταπτυχιακής εργασίας ήταν η εκπόνηση σχολιασμένης μετάφρασης ειδικού κειμένου από τη γερμανική στην ελληνική γλώσσα. Μεταφράστηκαν αποσπάσματα του μεταφρασεολογικού έργου «Λογοτεχνική Μετάφραση» του Γιερν Άλμπρεχτ. Συντάχθηκε γλωσσάρι ορολογίας, ενώ κάθε όρος συνοδεύεται από τεκμηρίωση της σημασίας και της χρήσης του (ορισμός και επεξηγηματικό συγκείμενο) τόσο στη γλώσσα-πηγή όσο και στη γλώσσα-στόχο, με βιβλιογραφική παραπομπή και διαδικτυακό σύνδεσμο, όπου αυτός είναι διαθέσιμος. Εξετάστηκαν ακόμη οι επικοινωνιακές περιστάσεις δημιουργίας του κειμένου-πηγής και του κειμένου-στόχου με αναφορές στη Θεωρία του Σκοπού του Χανς Φερμέερ και την κειμενική ανάλυση της Κριστιάνε Νορντ. Στη συνέχεια, παρουσιάστηκε αναλυτικά η μέθοδος προσέγγισης του κειμένου και της ορολογίας του, στο πλαίσιο της ανάλυσης της μεταφραστικής πρόθεσης και στρατηγικής. Ακολουθεί η παράθεση και ανάλυση των μεταφραστικών προβλημάτων που απαντούν στο κείμενο καθώς και του χειρισμού τους με τη χρήση διάφορων μεταφραστικών τεχνικών. Διαπιστώθηκε και καταδεικνύεται η αλληλεξάρτηση θεωρίας και πράξης κατά τη μεταφραστική δραστηριότητα.
description: Aim of the present master thesis was to produce an annotated translation of a specialized text from German into Greek. Excerpts from the translation studies work “Literary Translation” by Jorn Albrecht were translated. A glossary of terms was prepared and each term is accompanied with a documentation of its meaning and its use (definition and explanatory context) both in the source language and in the target language, including a bibliographical reference and an internet link, in cases one was available. The communication circumstances, in which the source text and the target text were produced, were examined with references to Skopos theory of Hans Vermeer and the text analysis of Christiane Nord. The approach method to the text and its terminology is then thoroughly presented, in accordance with the analysis of the translation purpose and strategy. What follows is a presentation and analysis of the translation problems encountered in the text as well as of the ways they have been handled by means of various translation techniques. An interconnection between theory and practice in the course of the translation activity is established and demonstrated.
Spectroscopy of SrRuO/Ru Junctions in Eutectic
Creators: name: Yaguchi, H.
name: Takizawa, K.
name: Kawamura, M.
name: Kikugawa, N.
name: Maeno, Y.
name: Meno, T.
name: Akazaki, T.
name: Semba, K.
name: Takayanagi, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have investigated the tunnelling properties of the interface between superconducting Sr2RuO4 and a single Ru inclusion in eutectic. By using a micro-fabrication technique, we have made Sr2RuO4/Ru junctions on the eutectic system that consists of Sr2RuO4 and Ru micro-inclusions. Such a eutectic system exhibits surface superconductivity, called the 3-K phase. A zero bias conductance peak (ZBCP) was observed in the 3-K phase. We propose to use the onset of the ZBCP to delineate the phase boundary of a time-reversal symmetry breaking state.
description: To be published in Proc of 24th Int. Conf. on Low Temperature Physics (LT24); 2 pages
Discovery of photospheric argon in very hot central stars of planetary nebulae and white dwarfs
Creators: name: Werner, K.
name: Rauch, T.
name: Kruk, J. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the first discovery of argon in hot evolved stars and white dwarfs. We have identified the ArVII 1063.55A line in some of the hottest known (Teff=95000-110000 K) central stars of planetary nebulae and (pre-) white dwarfs of various spectral type. We determine the argon abundance and compare it to theoretical predictions from stellar evolution theory as well as from diffusion calculations. We analyze high-resolution spectra taken with the Far Ultraviolet Spectroscopic Explorer. We use non-LTE line-blanketed model atmospheres and perform line-formation calculations to compute synthetic argon line profiles. We find a solar argon abundance in the H-rich central star NGC1360 and in the H-deficient PG1159 star PG1424+535. This confirms stellar evolution modeling that predicts that the argon abundance remains almost unaffected by nucleosynthesis. For the DAO-type central star NGC7293 and the hot DA white dwarfs PG0948+534 and REJ1738+669 we find argon abundances that are up to three orders of magnitude smaller than predictions of calculations assuming equilibrium of radiative levitation and gravitational settling. For the hot DO white dwarf PG1034+001 the theoretical overprediction amounts to one dex. Our results confirm predictions from stellar nucleosynthesis calculations for the argon abundance in AGB stars. The argon abundance found in hot white dwarfs, however, is another drastic example that the current state of equilibrium theory for trace elements fails to explain the observations quantitatively.
description: Accepted for publication in A&A
title: Influence of wrongly assumed probability distribution on the uncertainty of resistance measurement by technical method
Creators: name: Szczesny, Stanisław
name: Golijanek-Jędrzejczyk, Anna
name: Świsulski, Dariusz
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 63-73
Η μετάφραση των νεολογισμών στο θέατρο: Η περίπτωση των έργων του Δημήτρη Δημητριάδη
Creators: name: Τοπαλίδου, Αναστασία Δημήτριος
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Μετάφραση νεολογισμών
Θέατρο
Δημήτρης Δημητριάδης
Translation of neologisms
Theater
Dimitris Dimitriadis

description: Σκοπός της παρούσης διπλωματικής εργασίας ήταν η μελέτη των νεολογισμών στο θέατρο και συγκεκριμένα η περίπτωση των έργων του Δημήτρη Δημητριάδη. Αρχικά, παρουσιάστηκε το φαινόμενο του νεολογισμού και οι παραλλαγές του, διαχρονικά, όπως το πέρασμα και η εξέλιξη του φαινομένου στη σύγχρονη εποχή. Έπειτα, παρουσιάστηκε η λειτουργία των νεολογισμών στη θεατρική παράσταση, δεδομένης της πολυπλοκότητας της μεταφραστικής διαδικασίας. Επιπλέον, έγινε εστίαση στη μετάφραση των νεολογισμών στο θέατρο και στους παράγοντες, στους οποίους πρέπει να επιστήσει την προσοχή του ο κάθε μεταφραστής λογοτεχνίας. Κύριο πεδίο μελέτης ήταν οι μεταφραστικές τεχνικές που αναπτύχθηκαν προκειμένου να μεταφραστούν επιτυχώς οι νεολογισμοί του Δ. Δημητριάδη. Για την καλύτερη παρουσίαση και επεξήγηση των ευρημάτων έγινε ο διαχωρισμός σε δύο κατηγορίες: α) στην απόδοση νεολογισμών με νεολογισμό και β) στην απόδοση νεολογισμών με μη-νεολογισμό. Έπειτα, ακολούθησε ο σχολιασμός των εφαρμοσμένων μεταφραστικών τεχνικών, καθώς και η ποσοτική παρουσίασή τους με τη βοήθεια γραφημάτων. Τέλος, στο παράρτημα της εργασίας, συντάχθηκε, έπειτα από μία διεξοδική διαδικασία έρευνας και μελέτης, τόσο στα πρωτότυπα όσο και στα αντίστοιχα μεταφρασμένα έργα του Δ. Δημητριάδη στη γαλλική γλώσσα, ένα γλωσσάρι με όλους τους νεολογισμούς, που εντοπίστηκαν στα κείμενά του.
description: The aim of the present thesis was the study of neologisms in the theater and in particular in the case of Dimitris Dimitriadis’s plays. Initially, the phenomenon of neologism and its variants was presented over time, as also its passage and evolution in modern times. Then, the function of neologisms in the theatrical performance was presented, given the complexity of the translation process. In addition, there was a focus on the translation of neologisms in the theater and on the factors to which each literary translator should draw attention. The main key study was the translation techniques which were developed in order to translate successfully the neologisms inspired by D. Dimitriadis. For the best presentation and explanation of the findings, a distinction in two categories was made: a) translation of neologism with a neologism and b) translation of neologism with a non-neologism. Then, a commentary on the applied translation techniques followed, as well as their quantitative presentation with the use of graphs. Finally, in the appendix of the paper, after a thorough research and study process in both, the original and the corresponding translations of D. Dimitriadis plays translated in french, a glossary with all the neologisms that were found in his plays was composed.
Characterization of a fabrication process for the integration of superconducting qubits and RSFQ circuits
Creators: name: Castellano, Maria Gabriella
name: Gronberg, Leif
name: Carelli, Pasquale
name: Chiarello, Fabio
name: Cosmelli, Carlo
name: Leoni, Roberto
name: Poletto, Stefano
name: Torrioli, Guido
name: Hassel, Juha
name: Helisto, Panu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In order to integrate superconducting qubits with rapid-single-flux-quantum (RSFQ) control circuitry, it is necessary to develop a fabrication process that fulfills at the same time the requirements of both elements: low critical current density, very low operating temperature (tens of milliKelvin) and reduced dissipation on the qubit side; high operation frequency, large stability margins, low dissipated power on the RSFQ side. For this purpose, VTT has developed a fabrication process based on Nb trilayer technology, which allows the on-chip integration of superconducting qubits and RSFQ circuits even at very low temperature. Here we present the characterization (at 4.2 K) of the process from the point of view of the Josephson devices and show that they are suitable to build integrated superconducting qubits.
title: Zastosowanie metod niejawnych Rungego-Kutty do rozwiązywania równań różniczkowych sztywnych modelu transformatora jednofazowego w stanie biegu jałowego
Creators: name: Baron, Bernard
name: Kolańska-Płuska, Joanna
name: Kraszewski, Tomasz
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 75-86
Η επίδραση ενός προγράμματος παραδοσιακών και παιδαγωγικών παιχνιδιών στις πεποιθήσεις εφήβων μαθητών/τριών για την εξωσχολική φυσική δραστηριότητα
Creators: name: Ζαχαριάδου, Κωνσταντίνα Παναγιώτης
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Φυσική Αγωγή
Κίνητρα
Παιχνίδι
Physical education
Motivation
Play

description: Σκοπός της παρούσας έρευνας ήταν να μελετήσει την επίδραση ενός προγράμματος παιδαγωγικών και παραδοσιακών παιχνιδιών στις πεποιθήσεις μαθητών/τριών Γυμνασίου για εξωσχολική φυσική δραστηριότητα. Οι συμμετέχοντες/ουσες συμπλήρωσαν ερωτηματολόγιο πρίν και αμέσως μετά την παρέμβαση και μετρήθηκαν το κλίμα κινήτρων, τα κίνητρα και οι εμπειρίες από το μάθημα Φυσικής Αγωγής, τα κίνητρα, οι στάσεις, η υποκειμενική νόρμα, ο αντιληπτός έλεγχος συμπεριφοράς, και η πρόθεση για εξωσχολική φυσική δραστηριότητα. Από τα αποτελέσματα φάνηκε ότι η εφαρμογή παρέμβασης με παιδαγωγικά και παραδοσιακά παιχνίδια δεν επέφερε αλλαγές στα κίνητρα, τις εμπειρίες και τις αντιλήψεις των μαθητών/τριών γυμνασίου. Τα ευρήματα της παρούσας έρευνας έδωσαν πολύ σημαντικά στοιχεία για την αποτελεσματικότητα των παρεμβάσεων και τις προϋποθέσεις εφαρμογής εναλλακτικών μορφών διδασκαλίας στο μάθημα της Φυσικής Αγωγής.
description: The aim of the present study was to investigate the effect of pedagogical and traditional games on secondary school students’ motivation and beliefs towards physical education and leisure-time physical activity. Participants completed a survey just prior and immediately after the intervention including measures of perceptions of autonomy supportive climate, physical education and leisure-time physical activity motivational regulations, experiences in physical education, and attitudes, perceived behavioral control, subjective norms and intentions towards leisure-time physical activity. The results showed that the intervention including pedagogical and traditional games didn’t significantly influence students’ motivation and beliefs. These findings provide valuable information about the effectiveness of interventions and the application of innovative teaching approaches in physical education lessons.
Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem
Creators: name: Lüdde, Hans Jürgen
name: Horbatsch, Marko
name: Kirchner, Tom
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Energy loss in collisions of charged projectiles with many-electron systems can be dealt with in time-dependent density functional theory by invoking Ehrenfest's theorem for the time evolution of expectation values of observables. We derive an exact expression for the evaluation of energy loss for systems described in a target reference frame, which is a functional of the electron density. Using an approximation scheme we then apply the expression to antiproton-atom collisions at intermediate and high energies within the framework of the basis generator method. The calculations are performed within the semiclassical approximation for the nuclear motion, and a straight-line trajectory is employed. The energy loss is evaluated from an expectation value of the time derivative of the time-dependent projectile potential and avoids the problem of identifying the excited and ionized many-electron contributions in the many-electron wavefunction. There is also no need to invoke the independent-event model, since the calculations are performed within the framework of the independent-electron mean-field model. Detailed comparisons are provided for net ionization and total energy loss of antiprotons colliding with hydrogen, helium, neon, carbon, nitrogen and oxygen. Reasonable agreement is found with the results from one-electron and two-electron calculations for atomic hydrogen and helium, and with experiment in the latter case. For the $\bar p - \rm Ne$ system at intermediate collision energies we find discrepancies with previous work that included only single-electron transitions. The sequence of results for C, N, O, Ne allows one to paint a consistent picture which awaits experimental verification.
description: as accepted by Physical Review A for publication
Constituent Groups of Clifford Semigroups Arising from t-Closure
Creators: name: Kabbaj, S.
name: Mimouni, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Commutative Algebra (math.AC)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 13C20; 13F05; 11R65; 11R29; 20M14

description: The t-class semigroup of an integral domain R, denoted S_t(R), is the semigroup of fractional t-ideals modulo its subsemigroup of nonzero principal ideals with the operation induced by ideal t-multiplication. We recently proved that if R is a Krull-type domain, then S_t(R) is a Clifford semigroup. This paper aims to describe the idempotents of S_t(R) and the structure of their associated groups. We extend and recover well-known results on class semigroups of valuation domains and Prufer domains of finite character.
description: 13 pages. To appear in Journal of Algebra
title: Algorytm segmentacji obrazów CT i PET do identyfikacji i wyznaczania objętości glejaka mózgu
Creators: name: Kot, Estera
name: Siwek, Krzysztof
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 87-97
Bimodality in low luminosity E and S0 galaxies
Creators: name: Sansom, A. E.
name: Northeast, M. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Stellar population characteristics are presented for a sample of low luminosity early-type galaxies (LLEs) in order to compare them with their more luminous counterparts. Long-slit spectra of a sample of 10 LLEs were taken with the ESO New Technology Telescope, selected for their low luminosities. Line strengths were measured on the Lick standard system. Lick indices for these LLEs were correlated with velocity dispersion (sigma), alongside published data for a variety of Hubble types. The LLEs were found to fall below an extrapolation of the correlation for luminous ellipticals and were consistent with the locations of spiral bulges in plots of line strengths versus sigma. Luminosity weighted average ages, metallicities and abundance ratios were estimated from chi-squared fitting of 19 Lick indices to predictions from simple stellar population models. The LLEs appear younger than luminous ellipticals and of comparable ages to spiral bulges. These LLEs show a bimodal metallicity distribution, consisting of a low metallicity group (possibly misclassified dwarf spheroidal galaxies) and a high metallicity group (similar to spiral bulges). Finally, they have low alpha-element to iron-peak abundance ratios indicative of slow, extended star formation.
description: 26 pages, 9 figures and 9 tables. PDF file; accepted for publication in MNRAS
title: Wykrywanie przewodów napowietrznych w obrazie cyfrowym w czasie rzeczywistym z użyciem FPGA
Creators: name: Kowalski, Paweł
name: Smyk, Robert
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 99-110
Spin-free formulation of the multireference driven similarity renormalization group: A benchmark study of first-row diatomic molecules and spin-crossover energetics
Creators: name: Li, Chenyang
name: Evangelista, Francesco A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a spin-free formulation of the multireference (MR) driven similarity renormalization group (DSRG) by employing the ensemble normal ordering of Mukherjee and Kutzelnigg [W. Kutzelnigg and D. Mukherjee, J. Chem. Phys. 107, 432 (1997)]. This ensemble averages over all microstates for a given total spin quantum number and, therefore, it is invariant with respect to SU(2) transformations. As such, all equations may be reformulated in terms of spin-free quantities and they closely resemble those of spin-adapted closed-shell coupled cluster (CC) theory. The current implementation is used to assess the accuracy of various truncated MR-DSRG methods (perturbation theory up to third order and iterative methods with single and double excitations) in computing the constants of thirty-three first-row diatomic molecules. The accuracy trends for these first-row diatomics are consistent with our previous benchmark on a small subset of closed-shell diatomic molecules. We then present the first MR-DSRG application on transition-metal complexes by computing the spin splittings of the [Fe(H$_2$O)$_6$]$^{2+}$ and [Fe(NH$_3$)$_6$]$^{2+}$ molecules. Focal point analysis (FPA) shows that third-order perturbative corrections are essential to achieve reasonably converged energetics. A FPA based on the linearized MR-DSRG theory with one- and two-body operators and up to a quintuple-$ζ$ basis set predicts the spin splittings of [Fe(H$_2$O)$_6$]$^{2+}$ and [Fe(NH$_3$)$_6$]$^{2+}$ to be $-35.7$ and $-17.1$ kcal mol$^{-1}$, respectively, showing good agreement with results of local CC theory with singles, doubles, and perturbative triples.
title: Zastosowanie metod numerycznych w projektowaniu górnoprzepustowych filtrów cyfrowych 2D
Creators: name: Kowalski, Janusz
name: Pęksiński, Jakub
name: Mikołajczak, Grzegorz
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 111-120
title: Algorytm Ewolucyjny inspirowany informatyką kwantową do poprawy parametrów modelu neuralnego wyznaczania cen na Towarowej Giełdzie Energii Elektrycznej notowanych na RDN
Creators: name: Tchórzewski, Jerzy
name: Ruciński, Dariusz
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 121-132
Phases of Five-Dimensional Black Holes
Creators: name: Elvang, Henriette
name: Emparan, Roberto
name: Figueras, Pau
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We argue that the configurations that approach maximal entropy in five-dimensional asymptotically flat vacuum gravity, for fixed mass and angular momentum, are `black Saturns' with a central, close to static, black hole and a very thin black ring around it. For any value of the angular momentum, the upper bound on the entropy is equal to the entropy of a static black hole of the same total mass. For fixed mass, spin and area there are families of multi-ring solutions with an arbitrarily large number of continuous parameters, so the total phase space is infinite-dimensional. Somewhat surprisingly, the phases of highest entropy are not in thermal equilibrium. Imposing thermodynamical equilibrium drastically reduces the phase space to a finite, small number of different phases.
description: 16 pages, 2 figures; v2: comments and ref added; v3: ref added
ACDnet: An action detection network for real-time edge computing based on flow-guided feature approximation and memory aggregation
Creators: name: Liu, Yu
name: Yang, Fan
name: Ginhac, Dominique
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Interpreting human actions requires understanding the spatial and temporal context of the scenes. State-of-the-art action detectors based on Convolutional Neural Network (CNN) have demonstrated remarkable results by adopting two-stream or 3D CNN architectures. However, these methods typically operate in a non-real-time, ofline fashion due to system complexity to reason spatio-temporal information. Consequently, their high computational cost is not compliant with emerging real-world scenarios such as service robots or public surveillance where detection needs to take place at resource-limited edge devices. In this paper, we propose ACDnet, a compact action detection network targeting real-time edge computing which addresses both efficiency and accuracy. It intelligently exploits the temporal coherence between successive video frames to approximate their CNN features rather than naively extracting them. It also integrates memory feature aggregation from past video frames to enhance current detection stability, implicitly modeling long temporal cues over time. Experiments conducted on the public benchmark datasets UCF-24 and JHMDB-21 demonstrate that ACDnet, when integrated with the SSD detector, can robustly achieve detection well above real-time (75 FPS). At the same time, it retains reasonable accuracy (70.92 and 49.53 frame mAP) compared to other top-performing methods using far heavier configurations. Codes will be available at https://github.com/dginhac/ACDnet.
description: Accepted for publication in Pattern Recognition Letters
title: Zastosowanie algorytmu szarych wilków do rozwiązania zadań optymalizacji urządzeń elektromagnetycznych
Creators: name: Knypiński, Łukasz
name: Nowak, Lech
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 133-144
title: Efficiency analysis of parallel computing applied to auto-tuning of state feedback speed controller for PMSM drive
Creators: name: Szczepański, Rafał
name: Tarczewski, Tomasz
name: Grzesiak, Lech M.
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 145-156
Open-domain question classification and completion in conversational information search
Creators: name: Kia, Omid Mohammadi
name: Neshati, Mahmood
name: Alamdari, Mahsa Soudi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Searching for new information requires talking to the system. In this research, an Open-domain Conversational information search system has been developed. This system has been implemented using the TREC CAsT 2019 track, which is one of the first attempts to build a framework in this area. According to the user's previous questions, the system firstly completes the question (using the first and the previous question in each turn) and then classifies it (based on the question words). This system extracts the related answers according to the rules of each question. In this research, a simple yet effective method with high performance has been used, which on average, extracts 20% more relevant results than the baseline.
title: Analiza i optymalizacja zgrzewów ultradźwiękowych przewodów miedzianych z wykorzystaniem logiki rozmytej
Creators: name: Zawadzki, Jacek
name: Jędryczka, Cezary
Publisher: name: Publishing House of Poznan University of Technology
Year: 2019

description: Poznan University of Technology Academic Journals: Electrical Engineering, 100, 157-166