cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Delay-induced resonance suppresses damping-induced unpredictability
Creators: name: Coccolo, Mattia
name: Cantisán, Julia
name: Seoane, Jesús M.
name: Rajasekar, S.
name: Sanjuán, Miguel A. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Combined effects of the damping and forcing in the underdamped time-delayed Duffing oscillator are considered in this paper. We analyze the generation of a certain damping-induced unpredictability, due to the gradual suppression of interwell oscillations. We find the minimal amount of the forcing amplitude and the right forcing frequency to revert the effect of the dissipation, so that the interwell oscillations can be restored, for different time delay values. This is achieved by using the delay-induced resonance, in which the time delay replaces one of the two periodic forcings present in the vibrational resonance. A discussion in terms of the time delay of the critical values of the forcing for which the delay-induced resonance can tame the dissipation effect is finally carried out.
description: 22 pages, 11 figures. To be published in Philosophical Transactions of the Royal Society A
A lattice approach to the conformal $\OSp(2S+2|2S)$ supercoset sigma model. Part I: Algebraic structures in the spin chain. The Brauer algebra
Creators: name: Candu, Constantin
name: Saleur, Hubert
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We define and study a lattice model which we argue is in the universality class of the $OSp(2S+2|2S)$ supercoset sigma model for a large range of values of the coupling constant $g_σ^2$. In this first paper, we analyze in details the symmetries of this lattice model, in particular the decomposition of the space of the quantum spin chain $V^{\otimes L}$ as a bimodule over $OSp(2S+2|2S)$ and its commutant, the Brauer algebra $B_L(2)$. It turns out that $V^{\otimes L}$ is a nonsemisimple module for both $OSp(2S+2|2S)$ and $B_L(2)$. The results are used in the companion paper to elucidate the structure of the (boundary) conformal field theory.
description: 36 pages, 20 figures
Διάγνωση γνώσης σε 3 ελληνικές επιχειρήσεις:
Creators: name: Τίκβα, Χριστίνα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Διάγνωση γνώσης
Στατιστική ανάλυση
Knowledge auditing
Statistical analysis

description: Η παρούσα διπλωματική εργασία έχει ως αντικείμενό της την διάγνωση γνώσης σε 3 ελληνικές επιχειρήσεις. Για τη διάγνωση χρησιμοποιήθηκε ερωτηματολόγιο που αναπτύχθηκε από το Τεχνολογικό Πάρκο Θεσσαλονίκης σε συνεργασία με το Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης. Στα δεδομένα που συλλέχθηκαν εφαρμόστηκε παραγοντική ανάλυση, και στη συνέχεια ακολούθησε επεξεργασία των λανθανουσών μεταβλητών από την οποία προέκυψαν εξαιρετικά ενδιαφέροντα συμπεράσματα.
description: The purpose of the present work is the knowledge auditing in 3 Greek enterprises. For the knowledge auditing was used a questionnaire that was developed by the technological park Thessaloniki in collaboration with the Aristotelian University Thessaloniki. Factor analysis was applied, and afterwards it followed treatment of latent variables.
Doping-dependent evolution of low-energy excitations and quantum phase transitions within effective model for High-Tc copper oxides
Creators: name: Korshunov, M. M.
name: Ovchinnikov, S. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this paper a mean-field theory for the spin-liquid paramagnetic non-superconducting phase of the p- and n-type High-$T_c$ cuprates is developed. This theory applied to the effective $t-t'-t''-J^*$ model with the {\it ab initio} calculated parameters and with the three-site correlated hoppings. The static spin-spin and kinematic correlation functions beyond Hubbard-I approximation are calculated self-consistently. The evolution of the Fermi surface and band dispersion is obtained for the wide range of doping concentrations $x$. For p-type systems the three different types of behavior are found and the transitions between these types are accompanied by the changes in the Fermi surface topology. Thus a quantum phase transitions take place at $x=0.15$ and at $x=0.23$. Due to the different Fermi surface topology we found for n-type cuprates only one quantum critical concentration, $x=0.2$. The calculated doping dependence of the nodal Fermi velocity and the effective mass are in good agreement with the experimental data.
description: 8 pages
Limits on the AGN activities in X-ray underluminous galaxy groups
Creators: name: Dwarakanath, K. S.
name: Nath, Biman B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have observed four X-ray underluminous groups of galaxies using the Giant Meterwave RadioTelescope. The groups NGC 524, 720, 3607, and 4697 are underluminous in relation to the extrapolation of the Lx - T relation from rich clusters and do not show any evidence of current AGN activities that can account for such a departure. The GMRT observations carried out at low frequencies (235 and 610 MHz) were aimed at detecting low surface brightness, steep-spectrum sources indicative of past AGN activities in these groups. No such radio emissions were detected in any of these four groups. The corresponding upper limits on the total energy in relativistic particles is about 3 X 10$^{57}$ erg. This value is more than a factor of 100 less than that required to account for the decreased X-ray luminosities (or, enhanced entropies) of these four groups in the AGN-heating scenario. Alternatively, the AGN activity must have ceased about 4 Gyr ago, allowing the relativistic particles to diffuse out to such a large extent (about 250 kpc) that their radio emission could have been undetected by the current observations. If the latter scenario is correct, the ICM was pre-heated before the assembly of galaxy clusters.
description: 10 pages, 3 figures, accepted for publication in ApJ Letters
Hyperbolic Superspaces and Super-Riemann Surfaces
Creators: name: Hu, Zhi
name: Zong, Runhong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper, we will generalize some results in Manin's paper "Three-dimensional hyperbolic geometry as $\infty$-adic Arakelov geometry" to the supergeometric setting. More precisely, viewing $\mathbb{C}^{1|1}$ as the boundary of the hyperbolic superspace $\mathcal{H}^{3|2}$, we reexpress the super-Green functions on the supersphere $\hat{\mathbb{C}}^{1|1}$ and the supertorus $T^{1|1}$ by some data derived from the supergeodesics in $\mathcal{H}^{3|2}$.
Η ηθική θεώρηση της ευγονικής:
Creators: name: Μπαρμπούτη, Αλεξάνδρα Αχιλλέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Ευγονική
Βιοηθική
Χριστιανική ηθική
Γενετική ανισότητα
Γενετικός έλεγχος
Γενετική μηχανική
Eugenics
Bioethics
Christian ethics
Genetic discrimination
Genetic test
Genetic engineering

description: Ευγονική είναι η προσπάθεια για την επίτευξη με κάθε κόστος της βιολογικής τελειότητας, της δημιουργίας του «υπερανθρώπου». Βασική της διδασκαλία είναι η γενετική ανισότητα. Γι’ αυτό το λόγο, προωθεί τις διακρίσεις και τον ρατσισμό. Είναι μια ιδεολογία, η οποία στηρίζεται σε ένα συνονθύλευμα φιλοσοφικών απόψεων σχετικά με την αναπαραγωγή και την εξέλιξη του ανθρώπου και ενώ δεν ταυτίζεται με καμία ιατρική πράξη, επιδιώκει τη βιολογική τελειοποίηση μέσω της αλόγιστης χρήσης των επιστημονικών επιτευγμάτων. Τα προβλήματα βιοηθικής, που προκύπτουν είναι ποικίλα, όπως η διαδικασία της επιλογής ενός εμβρύου, η χρήση των γενετικών δεδομένων και των δυνατοτήτων της γενετικής μηχανικής. Η χριστιανική ηθική βρίσκεται σε πλήρη αντίθεση με την ευγονική διότι θεωρεί ότι κάθε άνθρωπος είναι ζωντανή εικόνα του Θεού και ανεξάρτητα από τα χαρακτηριστικά του χαίρει σεβασμού και εκτίμησης.
description: Eugenics is the endeavour to biological perfection, to the creation of a “superhuman”. Its basic teaching is genetic inequality. This is the reason why promotes discrimination and racism. It is an ideology, which is based on a variety of philosophical aspects concerning procreation and human evolution. Despite the fact that eugenics is not identified with any medical praxis, it aims at biological perfection doing incogitant use of medical achievements. Many bioethical problems arise, such as embryo selection, genetic privacy and the potentiality of genetic engineering. Christian ethics is in total disagreement with eugenics, because it considers every human being as a living image of God. Therefore, regardless of their traits, human beings deserve respect and appreciation.
A Bright Source of Telecom Single Photons Based on Quantum Frequency Conversion
Creators: name: Morrison, Christopher L.
name: Rambach, Markus
name: Koong, Zhe Xian
name: Graffitti, Francesco
name: Thorburn, Fiona
name: Kar, Ajoy K.
name: Ma, Yong
name: Park, Suk-In
name: Song, Jin Dong
name: Stoltz, Nick G.
name: Bouwmeester, Dirk
name: Fedrizzi, Alessandro
name: Gerardot, Brian D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: On-demand indistinguishable single photon sources are essential for quantum networking and communication. Semiconductor quantum dots are among the most promising candidates, but their typical emission wavelength renders them unsuitable for use in fibre networks. Here, we present quantum frequency conversion of near-infrared photons from a bright quantum dot to the telecommunication C-band, allowing integration with existing fibre architectures. We use a custom-built, tunable 2400 nm seed laser to convert single photons from 942 nm to 1550 nm in a difference frequency generation process. We achieve an end-to-end conversion efficiency of $\sim$35%, demonstrate count rates approaching 1 MHz at 1550 nm with $g^{\left(2\right)}\left(0\right) = 0.04$, and achieve Hong-Ou-Mandel visibilities of 60%. We expect this scheme to be preferable to quantum dot sources directly emitting at telecom wavelengths for fibre based quantum networking.
description: 7 pages, 4 figures
Additional file 1 of Robust circulating microRNA signature for the diagnosis and early detection of pancreatobiliary cancer
Creators: name: Mitsunaga, Shuichi
name: Ikeda, Masafumi
name: Ueno, Makoto
name: Kobayashi, Satoshi
name: Tsuda, Masahiro
name: Miki, Ikuya
name: Kuwahara, Takamichi
name: Hara, Kazuo
name: Takayama, Yukiko
name: Matsunaga, Yutaro
name: Hanada, Keiji
name: Shimizu, Akinori
name: Yoshida, Hitoshi
name: Nomoto, Tomohiro
name: Takahashi, Kenji
name: Iwamoto, Hidetaka
name: Iwama, Hideaki
name: Hatano, Etsuro
name: Nakata, Kohei
name: Nakamura, Masafumi
name: Sudo, Hiroko
name: Takizawa, Satoko
name: Ochiai, Atsushi
Publisher: name: figshare
Year: 2025
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Hematology

description: Additional file 1: Supplemental Material: Robust circulating microRNA signature for the diagnosis and early detection of pancreatobiliary cancer. Supplementary Methods. Supplementary References. Figure S1. Performance of discriminants with three to six miRNA variables. Figure S2. t-SNE plot of comprehensive miRNAs in healthy control serum. Figure S3. WGCNA optimization of 357 robust miRNAs. Figure S4. Performance of 136 miRNA discriminants. Table S1. Time until sample freezing. Table S2. Clinical background. Table S3. Features of microRNA probes. Table S4. Discriminatory performance of Index-1, CA19-9, and their combination. Table S5. Discriminatory performance of Index-1 when changing the threshold for CA19-9 levels. Table S6. miRNA expression in pancreatic cancer lines and miR-665 effects on cell proliferation.
Probing 3D and NLTE models using APOGEE observations of globular cluster stars
Creators: name: Masseron, T.
name: Osorio, Y.
name: García-Hernández, D. A.
name: Prieto, C. Allende
name: Zamora, O.
name: Mészáros, Sz.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Hydrodynamical (or 3D) and non-local thermodynamic equilibrium (NLTE) effects are known to affect abundance analyses. However, there are very few observational abundance testsof 3D and NLTE models. We developed a new way of testing the abundance predictions of 3D and NLTE models, taking advantage of large spectroscopic survey data. We use a line-by-line analysis of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectra (H band) with the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS). We compute line-by-line abundances of Mg, Si, Ca, and Fe for a large number of globular cluster K giants in the APOGEE survey. We compare this line-by-line analysis against NLTE and 3D predictions. While the 1D-NLTE models provide corrections in the right direction, there are quantitative discrepancies between different models. We observe a better agreement with the data for the models including reliable collisional cross-sections. The agreement between data and models is not always satisfactory when the 3D spectra are computed in LTE. However, we note that for a fair comparison, 3D corrections should be computed with self-consistently derived stellar parameters, and not on 1D models with identical stellar parameters. Finally, we focus on 3D and NLTE effects on Fe lines in the H band, where we observe a systematic difference in abundance relative to the value from the optical. Our results suggest that the metallicities obtained from the H band are more accurate in metal-poor giants. More atomic data and extended self-consistent 3D-NLTE computations need to be made. The method we have developed for testing 3D and NLTE models could be extended to other lines and elements, and is particularly suited for large spectroscopic surveys.
description: 13 pages, 9 figures, accepted in A&A
Magnetic Skyrmions for Unconventional Computing
Creators: name: Li, Sai
name: Kang, Wang
name: Zhang, Xichao
name: Nie, Tianxiao
name: Zhou, Yan
name: Wang, Kang L.
name: Zhao, Weisheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Improvements in computing performance have significantly slowed down over the past few years owing to the intrinsic limitations of computing hardware. However, the demand for data computing has increased exponentially. To solve this problem, tremendous attention has been focused on the continuous scaling of Moore's Law as well as the advanced non-von Neumann computing architecture. A rich variety of unconventional computing paradigms has been raised with the rapid development of nanoscale devices. Magnetic skyrmions, spin swirling quasiparticles, have been endowed with great expectations for unconventional computing due to their potential as the smallest information carriers by exploiting their physics and dynamics. In this paper, we provide an overview of the recent progress of skyrmion-based unconventional computing from a joint device-application perspective. This paper aims to build up a panoramic picture, analyze the remaining challenges, and most importantly to shed light on the outlook of skyrmion based unconventional computing for interdisciplinary researchers.
description: 9 Figure, 1 Table
AGN-driven galactic outflows: comparing models to observations
Creators: name: Ishibashi, W.
name: Fabian, A. C.
name: Arakawa, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The actual mechanism(s) powering galactic outflows in active galactic nuclei (AGN) is still a matter of debate. At least two physical models have been considered in the literature: wind shocks and radiation pressure on dust. Here we provide a first quantitative comparison of the AGN radiative feedback scenario with observations of galactic outflows. We directly compare our radiation pressure-driven shell models with the observational data from the most recent compilation of molecular outflows on galactic scales. We show that the observed dynamics and energetics of galactic outflows can be reproduced by AGN radiative feedback, with the inclusion of radiation trapping and/or luminosity evolution. The predicted scalings of the outflow energetics with AGN luminosity can also quantitatively account for the observational scaling relations. Furthermore, sources with both ultra-fast and molecular outflow detections are found to be located in the `forbidden' region of the $N_\mathrm{H} - λ$ plane. Overall, an encouraging agreement is obtained over a wide range of AGN and host galaxy parameters. We discuss our results in the context of recent observational findings and numerical simulations. In conclusion, AGN radiative feedback is a promising mechanism for driving galactic outflows that should be considered, alongside wind feedback, in the interpretation of future observational data.
description: accepted for publication in MNRAS
Enhanced single-node boundary condition for the Lattice Boltzmann Method
Creators: name: Marson, Francesco
name: Thorimbert, Yann
name: Latt, Jonas
name: Chopard, Bastien
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We propose a new way to implement Dirichlet boundary conditions for complex shapes using data from a single node only, in the context of the lattice Boltzmann method. The resulting novel method exhibits second-order convergence for the velocity field and shows similar or better accuracy than the well established Bouzidi, Firdaouss, and Lallemand (2001) boundary condition for curved walls, despite its local nature. The method also proves to be suitable to simulate moving rigid objects or immersed surfaces either with or without prescribed motion. The core idea of the new approach is to generalize the description of boundary conditions that combine bounce-back rule with interpolations and to enhance them by limiting the information involved in the interpolation to a close proximity of the boundary.
Additional file 1 of Robust circulating microRNA signature for the diagnosis and early detection of pancreatobiliary cancer
Creators: name: Mitsunaga, Shuichi
name: Ikeda, Masafumi
name: Ueno, Makoto
name: Kobayshi, Satoshi
name: Tsuda, Masahiro
name: Miki, Ikuya
name: Kuwahara, Takamichi
name: Hara, Kazuo
name: Takayama, Yukiko
name: Matsunaga, Yutaro
name: Hanada, Keiji
name: Shimizu, Akinori
name: Yoshida, Hitoshi
name: Nomoto, Tomohiro
name: Takahashi, Kenji
name: Iwamoto, Hidetaka
name: Iwama, Hideaki
name: Hatano, Etsuro
name: Nakata, Kohei
name: Nakamura, Masafumi
name: Sudo, Hiroko
name: Takizawa, Satoko
name: Ochiai, Atsushi
Publisher: name: figshare
Year: 2025
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Hematology

description: Additional file 1: Supplemental Material: Robust circulating microRNA signature for the diagnosis and early detection of pancreatobiliary cancer. Supplementary Methods. Supplementary References. Figure S1. Performance of discriminants with three to six miRNA variables. Figure S2. t-SNE plot of comprehensive miRNAs in healthy control serum. Figure S3. WGCNA optimization of 357 robust miRNAs. Figure S4. Performance of 136 miRNA discriminants. Table S1. Time until sample freezing. Table S2. Clinical background. Table S3. Features of microRNA probes. Table S4. Discriminatory performance of Index-1, CA19-9, and their combination. Table S5. Discriminatory performance of Index-1 when changing the threshold for CA19-9 levels. Table S6. miRNA expression in pancreatic cancer lines and miR-665 effects on cell proliferation.
Near real-time selection of high redshift GRBs with Swift
Creators: name: Campana, S.
name: Tagliaferri, G.
name: Malesani, D.
name: Stella, L.
name: D'Avanzo, P.
name: Chincarini, G.
name: Covino, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A good fraction of GRBs detected by Swift are at a large redshift (up to z=6.3, so far). Their study allows us to investigate, among other things, the cosmic star formation in the early Universe (possibly up to the re-ionization era) and the chemical enrichment of the high-redshift gas. Here we present and discuss a method of selection which identifies high-redshift candidates based only upon promptly-available information provided by Swift. This method relies upon, Galactic extinction, GRB duration time and absence of an optical counterpart in the UVOT telescope onboard Swift. This tool may provide an extremely effective way to locate high-redshift astrophysical objects and to follow them in the optical/NIR band in near real time.
description: Submitted to A&A Letters
Astrochemical Bistability: Autocatalysis in Oxygen Chemistry
Creators: name: Dufour, G.
name: Charnley, S. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The origin of bistable solutions in the kinetic equations describing the chemistry of dense interstellar clouds is explained as being due to the autocatalysis and feedback of oxygen nuclei from the oxygen dimer (O2). We identify four autocatalytic processes that can operate in dense molecular clouds, driven respectively by reactions of H+, He+, C+, and S+ with O2. We show that these processes can produce the bistable solutions found in previous studies, as well as the dependence on various model parameters such as the helium ionization rate, the sulfur depletion and the {H}3+ electron recombination rate. We also show that ion-grain neutralizations are unlikely to affect the occurrence of bistability in dense clouds. It is pointed out that many chemical models of astronomical sources should have the potential to show bistable solutions.
Construction and Approximation of Stable Lévy Motion with Values in Skorohod Space
Creators: name: Saidani, Becem
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: Skorohod space
Stochastic process
Probability
Functional limit theorem

description: Under an appropriate regular variation condition, the affinely normalized partial sums of a sequence of independent and identically distributed random variables converges weakly to a non-Gaussian stable random variable. A functional version of this is known to be true as well, the limit process being a stable L´evy process. In this thesis, we developed an explicit construction for the α-stable L´evy process motion with values in D([0, 1]), by considering the cases α < 1 and α > 1. The case α < 1 is the simplest since we can work with the uniform topology of the sup-norm on D([0, 1]) and the construction follows more or less by classical techniques. The case α > 1 required more work. In particular, we encountered two problems : one was related to the construction of a modification of this process (for all time), which is right-continuous and has left-limit with respect to the J1 topology. This problem was solved by using the Itob-Nisio theorem. The other problem was more difficult and we only managed to solve it by developing a criterion for tightness of probability measures on the space of cadlag fonction on [0, T] with values in D([0, 1]), equipped with a generalization of Skorohod’s J1 topology. In parallel with the construction of the infinite-dimensional process Z, we focus on the functional extension of Roueff and Soulier [29]. This part of the thesis was completed using the method of point process, which gave the convergence of the truncated sum. The case α > 1 required more work due to the presence of centering. For this case, we developed an ad-hoc result regarding the continuity of the addition for functions on [0, T] with values in D([0, 1]), which was tailored for our problem.
Ο θεσμός της κατάχρησης/αποδυνάμωσης δικαιώματος στο ιδιωτικό δίκαιο κατά το άρθρο 281 ΑΚ. Θεωρητική θεμελίωση-νομολογιακή εφαρμογή:
Creators: name: Τσέλιος, Ευάγγελος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Κατάχρηση δικαιώματος
Αποδυνάμωση δικαιώματος
Αστικός κώδικας
θεωρία-Νομολογία
Abuse of rights
Weakening of rights
Civil code
Theory-jurisprudence

description: Η παρούσα εργασία εξετάζει από μεθοδολογική σκοπιά το θεσμό της κατάχρησης – αποδυνάμωσης δικαιώματος, όπως αυτός ρυθμίζεται στο ελληνικό ιδιωτικό δίκαιο και ειδικότερα στην διάταξη του άρθρου 281 του ελληνικού Αστικού Κώδικα, ως μηχανισμός άρσης των συγκρούσεων αντιτιθέμενων συμφερόντων. Ερευνώνται οι κύριες επιρροές της ευρωπαϊκής νομικής επιστήμης και οι κοινωνικοπολιτικοί παράγοντες που επέδρασαν στη θέσπιση αρχικά και κατόπιν στη διαμόρφωση της διατάξεως με τη μορφή που υφίσταται σήμερα στην ελληνική έννομη τάξη. Παραθέτονται τα κριτήρια εφαρμογής της διατάξεως και η θεωρητική τους θεμελίωση, και ακολουθεί η μελέτη του τρόπου αντιμετώπισης της διατάξεως από την ελληνική νομολογία, από τα πρώτα χρόνια έως και σήμερα, με αναφορά σε ενδεικτικές αποφάσεις που καλύπτουν το σύνολο σχεδόν των κλάδων του ιδιωτικού δικαίου και απασχόλησαν τα ελληνικά δικαστήρια και την κοινή γνώμη.
description: The present paper examines from methodological perspective the statute of abuse - weakening of rights, as regulated in the Greek private law and particularly in the provision of article 281 of Greek Civil Code, as a waiver of conflict for opposing interests. We examine the major influences of European legal science and the social and political factors that acted upon, firstly, the enactment and then the shaping of the provision to the form that currently exists in Greek public order. We present the criteria for application of the provision, and their theoretical foundation, followed by a study on how the Greek jurisprudence faced the provision from the early years, until now, with reference to indicative decisions, covering almost all branches of private law that occupied the Greek courts and the public opinion.
A Systematic Study of Lattice-based NIST PQC Algorithms: from Reference Implementations to Hardware Accelerators
Creators: name: Imran, Malik
name: Abideen, Zain Ul
name: Pagliarini, Samuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences

description: Security of currently deployed public key cryptography algorithms is foreseen to be vulnerable against quantum computer attacks. Hence, a community effort exists to develop post-quantum cryptography (PQC) algorithms, i.e., algorithms that are resistant to quantum attacks. In this work, we have investigated how lattice-based candidate algorithms from the NIST PQC standardization competition fare when conceived as hardware accelerators. To achieve this, we have assessed the reference implementations of selected algorithms with the goal of identifying what are their basic building blocks. We assume the hardware accelerators will be implemented in application specific integrated circuit (ASIC) and the targeted technology in our experiments is a commercial 65nm node. In order to estimate the characteristics of each algorithm, we have assessed their memory requirements, use of multipliers, and how each algorithm employs hashing functions. Furthermore, for these building blocks, we have collected area and power figures for 12 candidate algorithms. For memories, we make use of a commercial memory compiler. For logic, we make use of a standard cell library. In order to compare the candidate algorithms fairly, we select a reference frequency of operation of 500MHz. Our results reveal that our area and power numbers are comparable to the state of the art, despite targeting a higher frequency of operation and a higher security level in our experiments. The comprehensive investigation of lattice-based NIST PQC algorithms performed in this paper can be used for guiding ASIC designers when selecting an appropriate algorithm while respecting requirements and design constraints.
description: 38 pages and 8 figures
Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters I: M15
Creators: name: Meszaros, Sz.
name: Dupree, A. K.
name: Szentgyorgyi, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High resolution spectra of 110 selected red giant stars in the globular cluster M15 (NGC 7078) were obtained with Hectochelle at the MMT telescope in 2005 May, 2006 May, and 2006 October. Echelle orders containing Halpha and Ca H & K are used to identify emission and line asymmetries characterizing motions in the extended atmospheres. Emission in Halpha is detected to a luminosity of log (L/L_sun)=2.36, in this very metal deficient cluster, comparable to other studies, suggesting that appearance of emission wings is independent of stellar metallicity. The faintest stars showing Halpha emission appear to lie on the asymptotic giant branch (AGB) in M15. A line-bisector technique for Halpha reveals outflowing velocities in all stars brighter than log (L/L_sun)=2.5, and this outflow velocity increases with stellar luminosity, indicating the mass outflow increases smoothly with luminosity. Many stars lying low on the AGB show exceptionally high outflow velocities (up to 10-15 km s^{-1}) and more velocity variability (up to 6-8 km s^{-1}), than red giant branch (RGB) stars of similar apparent magnitude. High velocities in M15 may be related to the low cluster metallicity. Dusty stars identified from Spitzer Space Telescope infrared photometry as AGB stars are confirmed as cluster members by radial velocity measurements, yet their Halpha profiles are similar to those of RGB stars without dust. If substantial mass loss creates the circumstellar shell responsible for infrared emission, such mass loss must be episodic.
description: 21 pages, 14 figures, 8 tables, Accepted in Astronomical Journal; Tables fixed
Η ισότητα των φύλων υπό το πρίσμα των θετικών μέτρων υπέρ των γυναικών. Η νομολογία των ανωτάτων δικαστηρίων της Ελλάδας και της Ιταλίας:
Creators: name: Θεοδωρίδου, Θεοπούλα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Ισότητα φύλων
Θετικά μέτρα
Gender equality
Affirmative action

description: Η παρούσα εργασία μελετά τα θετικά μέτρα υπέρ των γυναικών και το εάν αυτά επιδρούν στην αρχή της ισότητας των φύλων, διαμορφώνοντας μια νέα – ουσιαστική- έννοιά της. Η σχετική νομολογία του ελληνικού Συμβουλίου της Επικρατείας και του ιταλικού Συνταγματικού Δικαστηρίου χωρίζεται σε δύο κατηγορίες, αυτή που αφορά στα θετικά μέτρα γενικά και αυτή που αφορά στα θετικά μέτρα ειδικά στον τομέα της πολιτικής αντιπροσώπευσης. Τα δύο δικαστήρια συνδέουν τα θετικά μέτρα με την έννοια της ουσιαστικής ισότητας: το ιταλΣυντΔικ ανάγεται άμεσα στο σχετικό άρθρο του ιταλικού Συντάγματος, ενώ το ΣτΕ θεωρεί ότι η εγκαθίδρυση μιας πραγματικής ισότητας είναι ο σκοπός των θετικών μέτρων. Ωστόσο, αυτή η σύνδεση δεν είναι αρκετή για να μετασχηματίσει την ισότητα των φύλων σε ουσιαστική, αλλά η ανάγνωσή της παραμένει τυπική- αναλογική. Τα θετικά μέτρα στοχεύοντας στην εξάλειψη των κοινωνικών διακρίσεων και προκαταλήψεων σε βάρος των γυναικών εξυπηρετούν πρωτίστως την τυπική ισότητα. Αυτό που αλλάζει με την εισαγωγή των θετικών μέτρων είναι ότι πλέον ο νομοθέτης ενδιαφέρεται να υπάρχει μια αντιστοιχία ανάμεσα σ’ αυτό που προβλέπει το δίκαιο και στον τρόπο που αυτό εφαρμόζεται στην πράξη.
description: The present thesis studies the affirmative action in favor of women and whether it leads to a new –substantial- concept of gender equality. The relevant case-law of the greek Council of the State and the italian Constitutional Court is divided into two categories, one that refers to affirmative action in general and another that refers to affirmative action specifically in the field of political representation. Both courts connect affirmative action to substantial equality: the italian Constitutional Court directly cites the relevant article of the italian Constitution, while the greek Council of the State considers that affirmative action aims at installing factual equality. However, this connection is not sufficient to transform gender equality into substantial equality, which remains within a formal-proportional context. Affirmative action by aiming mainly at the elimination of all social discrimination and prejudice towards women firstly serves formal equality. Nevertheless, through affirmative action the legislator is interested in ensuring that a correspondence exists between law provision and its application.
A conserved requirement for RME-8/DNAJC13 in neuronal autolysosome reformation in C. elegans and cultured mouse cortical neurons
Creators: name: Swords, Sierra B.
Publisher: name: No Publisher Supplied
Year: 2023

description: Autophagosomes fuse with lysosomes, forming autolysosomes that degrade engulfed cargo. To maintain lysosomal capacity, autolysosome reformation (ALR) must regenerate lysosomes from autolysosomes using a membrane tubule-based process. Maintaining lysosomal capacity is required to maintain cellular health, especially in neurons where lysosomal dysfunction has been repeatedly implicated in neurodegenerative disease. The DNAJ domain Hsc70 co-chaperone RME-8/DNAJC13 has been linked to endosomal coat protein regulation and to neurological disease. We report new analysis of the requirements for the RME-8/DNAJC13 protein in neurons, focusing on intact C. elegans mechanosensory neurons, and primary mouse cortical neurons in culture. Loss of RME-8/DNAJC13 in both systems results in accumulation of grossly elongated autolysosomal tubules. Further C. elegans analysis revealed a similar autolysosome tubule accumulation defect in mutants known to be required for ALR in mammals, including mutants lacking bec-1/BECN1/Beclin1 and vps-15/PIK3R4/p150 that regulate type-III PI3-kinase VPS-34, and dyn-1/dynamin that severs ALR tubules. Clathrin is also an important ALR regulator implicated in autolysosome tubule formation and release. In C. elegans we found that loss of RME-8 causes severe depletion of clathrin from neuronal autolysosomes, a phenotype shared with bec-1 and vps-15 mutants. We conclude that RME-8/DNAJC13 plays a previously unrecognized role in autolysosome reformation, likely affecting ALR tubule severing. Additionally, in both systems, we found that loss of RME-8/DNAJC13 appeared to reduce autophagic flux, suggesting feedback regulation from ALR to autophagy. Our results connecting RME-8/DNAJC13 to ALR and autophagy provide a potential mechanism by which RME-8/DNAJC13 could influence neuronal health and the progression of neurodegenerative disease.
Brosseder, Johannes: Verborgener Gott - verborgene Kirche?
Creators: name: Klaiber, Walter
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 52 Nr. 3 (2003): Ökumenische Rundschau, Band 52, Heft 3
Mutual neutralisation in Li$^+$+H$^-$/D$^-$ and Na$^+$+H$^-$/D$^-$ collisions: Implications of experimental results for non-LTE modelling of stellar spectra
Creators: name: Barklem, Paul S.
name: Amarsi, Anish M.
name: Grumer, Jon
name: Eklund, Gustav
name: Rosén, Stefan
name: Ji, MingChao
name: Cederquist, Henrik
name: Zettergren, Henning
name: Schmidt, Henning T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Advances in merged-beams instruments have allowed experimental studies of the mutual neutralisation (MN) processes in collisions of both Li$^+$ and Na$^+$ ions with D$^-$ at energies below 1 eV. These experimental results place constraints on theoretical predictions of MN processes of Li$^+$ and Na$^+$ with H$^-$, important for non-LTE modelling of Li and Na spectra in late-type stars. We compare experimental results with calculations for methods typically used to calculate MN processes, namely the full quantum (FQ) approach, and asymptotic model approaches based on the linear combination of atomic orbitals (LCAO) and semi-empirical (SE) methods for deriving couplings. It is found that FQ calculations compare best overall with the experiments, followed by the LCAO, and the SE approaches. The experimental results together with the theoretical calculations, allow us to investigate the effects on modelled spectra and derived abundances and their uncertainties arising from uncertainties in the MN rates. Numerical experiments in a large grid of 1D model atmospheres, and a smaller set of 3D models, indicate that neglect of MN can lead to abundance errors of up to 0.1 dex (26\%) for Li at low metallicity, and 0.2 dex (58\%) for Na at high metallicity, while the uncertainties in the relevant MN rates as constrained by experiments correspond to uncertainties in abundances of much less than 0.01~dex (2\%). This agreement for simple atoms gives confidence in the FQ, LCAO and SE model approaches to be able to predict MN with the accuracy required for non-LTE modelling in stellar atmospheres.
description: Accepted by ApJ
Ρυθμός μεταφοράς λείας και ανάπτυξη των νεοσσών του κιρκινεζιού (Falco naumanni) στη Θεσσαλία:
Creators: name: Μπραζιώτης, Σωτήριος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Κιρκινέζι
Επιτυχία αναπαραγωγής
Ρυθμός μεταφοράς λείας
Lesser Kestrel
Falco naumanni
Bredding success
Rhythm of prey transfer

description: Το κιρκινέζι (Falco naumanni) είναι ένα μικρό γεράκι το αναπαράγεται σε αποικίες. Κατά τη διάρκεια των τελευταίων δεκαετιών ο πληθυσμός του έχει υποστεί δραματική μείωση (Bijleveld 1974, Cramp & Simmons 1980, Gonzalez and Merino 1990, Evans 1994, Heredia et al.1996, Biber 1996, BirdLife International 2000) σήμερα θεωρείται παγκοσμίως απειλούμενο είδος ( SPEC 1 category),(Tucker and Heath 1994, Collar et al. 1994, Hagemeijer and Blair 1997, Stattersfield & Capper 2000). Στην Ελλάδα παρουσιάζει ασυνεχή κατανομή και φωλεοποιεί κυρίως στη Θεσσαλία (Hallmann, B. 1996, Bakaloudis, D., Vlachos & E. Chatinikos 2000). Κατά τη διάρκεια της έρευνας εξετάστηκαν εκατόν είκοσι τέσσερις τεχνητές φωλιές. Σκοπός της έρευνας ήταν α) να διερευνηθεί εάν υπάρχουν σωματομετρικές διαφορές των νεοσσών που προέρχονται από φωλιές με 3 αυγά και από φωλιές με 5 αυγά β) να εκτιμηθεί αντίστοιχα ο ημερήσιος ρυθμός μεταφοράς λείας στις δυο ομάδες και γ) να εκτιμηθεί ο βαθμός επιτυχίας αναπαραγωγής της αποικίας. Συμπερασματικά, βρέθηκε ότι υπάρχουν σωματομετρικές διαφορές ανάμεσα στους νεοσσούς που προέρχονται από φωλιές με 3 και 5 αυγά, ο ρυθμός μεταφοράς λείας είναι μεγαλύτερος στις φωλιές με 5 αυγά. Το μέσο μέγεθος ωοτοκίας (clutch size) ήταν 4,06 αυγά, το μέσο μέγεθος νεοσσών κατά την εκκόλαψη (mean brood size at hatching) ήταν 3,84 νεοσσοί και το μέσο μέγεθος των νεοσσών κατά το πέταγμα (mean brood size at fledging) ήταν 3,49 νεοσσοί ανά ζευγάρι.
description: The Lesser Kestrel (Falco naumanni) is a small falcon that breeds colonially. During the last decades has suffered from a massive population decline (Bijleveld 1974, Cramp & Simmons 1980, Gonzalez and Merino 1990, Evans 1994, Heredia et al.1996, Biber 1996, BirdLife International 2000), now is of global conservation concern ( SPEC 1 category), and considered to be vulnerable universally (Tucker and Heath 1994, Collar et al. 1994, Hagemeijer and Blair 1997, Stattersfield & Capper 2000). In Greece, the Lesser Kestrel shows a discontinuous distribution and now is mainly concentrated in Thessaly (Hallmann, B. 1996, Bakaloudis, D., Vlachos & E. Chatinikos 2000). One hundred and twenty-four artificial nests (nest boxes) were examined during the study. The objectives were a) to examine if there were somatometric differences between nestlings from nests with 3 and 5 eggs b) to appreciate the daily rhythm of prey transferred in the two teams and c) to estimate the breeding success of Lesser Kestrels. It is concluded that there were somatometric differences between nestlings from nests with 3 and 5 eggs, the daily rhythm of prey transferred to nestlings in nests with 5 eggs was higher. Mean clutch size was 4.06 eggs, mean brood size at hatching was 3.84 young and mean brood size at fledging was 3.49 young per breeding pair.
The Brownian net
Creators: name: Sun, Rongfeng
name: Swart, Jan M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 82C21 (Primary) 60K35, 60F17, 60D05 (Secondary)

description: The (standard) Brownian web is a collection of coalescing one- dimensional Brownian motions, starting from each point in space and time. It arises as the diffusive scaling limit of a collection of coalescing random walks. We show that it is possible to obtain a nontrivial limiting object if the random walks in addition branch with a small probability. We call the limiting object the Brownian net, and study some of its elementary properties.
description: Published in at http://dx.doi.org/10.1214/07-AOP357 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Scalable Recommendation of Wikipedia Articles to Editors Using Representation Learning
Creators: name: Moskalenko, Oleksii
name: Parra, Denis
name: Saez-Trumper, Diego
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Wikipedia is edited by volunteer editors around the world. Considering the large amount of existing content (e.g. over 5M articles in English Wikipedia), deciding what to edit next can be difficult, both for experienced users that usually have a huge backlog of articles to prioritize, as well as for newcomers who that might need guidance in selecting the next article to contribute. Therefore, helping editors to find relevant articles should improve their performance and help in the retention of new editors. In this paper, we address the problem of recommending relevant articles to editors. To do this, we develop a scalable system on top of Graph Convolutional Networks and Doc2Vec, learning how to represent Wikipedia articles and deliver personalized recommendations for editors. We test our model on editors' histories, predicting their most recent edits based on their prior edits. We outperform competitive implicit-feedback collaborative-filtering methods such as WMRF based on ALS, as well as a traditional IR-method such as content-based filtering based on BM25. All of the data used on this paper is publicly available, including graph embeddings for Wikipedia articles, and we release our code to support replication of our experiments. Moreover, we contribute with a scalable implementation of a state-of-art graph embedding algorithm as current ones cannot efficiently handle the sheer size of the Wikipedia graph.
Novel methods for predicting timing and attention in human-agent interaction through application-driven scenarios
Creators: name: Wu, Tong
Publisher: name: No Publisher Supplied
Year: 2023

description: This thesis explores the critical aspects of timing and attention in developing advanced interactive systems. It investigates the capabilities of multimodal sensing systems and speech agents in fostering more proactive services, where the AI agent initiates natural interactions with the user. These studies acknowledge that current interactive agents, such as Siri, Alexa, and Google Assistant, are predominantly reactive, necessitating user initiation via a wake word. However, it identifies the potential for proactive interaction, contingent on the speech generation system's ability to accurately discern suitable moments to engage users. This presents a complex challenge due to the dynamic nature of human attention and the complexities of various environments. The thesis introduces innovative methods capable of predicting well-timed interactions initiated by agents, focusing on harnessing and enhancing human attention during these interactions. The first part of the thesis centers on predicting interaction timing in two prevalent scenarios: driving and dining, employing multimodal methods. In the context of human-vehicle interaction, the study recognizes the potential of proactive agents. It posits that well-designed proactive speech interfaces can be safer for drivers than visual-manual interfaces featuring buttons, knobs, and touchscreens. A multi-sensor fusion model is developed to predict optimal moments to engage drivers in speech interaction. The thesis also considers environments involving multiple individuals. It identifies social dining as an ideal setting for developing state-of-the-art methods for modeling human behaviors. An innovative interleaved model is constructed to predict optimal moments for an assisted-feeding robot to feed the user in social dining settings. The latter part of the thesis emphasizes the significance of human gaze and situational awareness as key indicators of attention levels. These factors greatly influence the prediction of opportune interaction timings in both driving and social dining scenarios. To effectively measure and enhance human attention levels, the thesis proposes an augmented reality (AR) interface. This interface guides the user's gaze toward relevant points of interest, enhancing their situational awareness and improving the timing and quality of interactions. It also opens up for the opportunity to close the loop by incorporating reinforcement learning. The thesis concludes by highlighting the innovative methods it presents as a novel approach to enhancing human attention levels in human-agent interactions. These methods pave the way for more efficient and satisfying user experiences. By focusing on the timing of interactions and the attention level of users, the thesis underscores the potential for significant advancements in interactive systems.