cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electromagnetic Properties of Kerr-Anti-de Sitter Black Holes
Creators: name: Aliev, Alikram N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We examine the electromagnetic properties of Kerr-anti-de Sitter (Kerr-AdS) black holes in four and higher spacetime dimensions. Assuming that the black holes may carry a test electric charge we show that the Killing one-form which represents the difference between the timelike generators in the spacetime and in the reference background can be used as a potential one-form for the associated electromagnetic field. In four dimensions the potential one-form and the Kerr-AdS metric with properly re-scaled mass parameter solve the Einstein-Maxwell equations, thereby resulting in the familiar Kerr-Newman-AdS solution. We solve the quartic equation governing the location of the event horizons of the Kerr-Newman-AdS black holes and present closed analytic expressions for the radii of the horizons. We also compute the gyromagnetic ratio for these black holes and show that it corresponds to g=2 just as for ordinary black holes in asymptotically flat spacetime. Next, we compute the gyromagnetic ratio for the Kerr-AdS black holes with a single angular momentum and with a test electric charge in all higher dimensions. The gyromagnetic ratio crucially depends on the dimensionless ratio of the rotation parameter to the curvature radius of the AdS background. At the critical limit, when the boundary Einstein universe is rotating at the speed of light, it tends to g=2 irrespective of the spacetime dimension. Finally, we consider the case of a five dimensional Kerr-AdS black hole with two angular momenta and show that it possesses two distinct gyromagnetic ratios in accordance with its two orthogonal 2-planes of rotation. In the special case of two equal angular momenta, the two gyromagnetic ratios merge into one leading to g=4 at the maximum angular velocities of rotation.
description: Typos corrected; 31 pages, REVTeX
On the Nature of AGN and Star Formation Enhancement in the $z = 3.1$ SSA22 Protocluster: The HST WFC3 IR View
Creators: name: Monson, Erik B.
name: Lehmer, Bret D.
name: Doore, Keith
name: Eufrasio, Rafael T.
name: Bonine, Brett
name: Alexander, David M.
name: Harrison, Chris M.
name: Kubo, Mariko
name: Mantha, Kameswara B.
name: Saez, Cristian
name: Straughn, Amber
name: Umehata, Hideki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We examine possible environmental sources of the enhanced star formation and active galactic nucleus (AGN) activity in the $z = 3.09$ SSA22 protocluster using Hubble WFC3 F160W ($\sim1.6\ \rm μm$) observations of the SSA22 field, including new observations centered on eight X-ray selected protocluster AGN. To investigate the role of mergers in the observed AGN and star formation enhancement, we apply both quantitative (Sérsic-fit and Gini-$M_{20}$) and visual morphological classifications to F160W images of protocluster Lyman break galaxies (LBGs) in the fields of the X-ray AGN and $z \sim 3$ field LBGs in SSA22 and GOODS-N. We find no statistically significant differences between the morphologies and merger fractions of protocluster and field LBGs, though we are limited by small number statistics in the protocluster. We also fit the UV-to-near-IR spectral energy distributions (SED) of F160W-detected protocluster and field LBGs to characterize their stellar masses and star formation histories (SFH). We find that the mean protocluster LBG is by a factor of $\sim2$ times more massive and more attenuated than the mean $z \sim 3$ field LBG. We take our results to suggest that ongoing mergers are not more common among protocluster LBGs than field LBGs, though protocluster LBGs appear to be more massive. We speculate that the larger mass of the protocluster LBGs contributes to the enhancement of SMBH mass and accretion rate in the protocluster, which in turn drives the observed protocluster AGN enhancement.
description: 43 pages, 18 figures. 32 page body and 11 page appendix. Updated with published version
Διδακτική αξιοποίηση του εκπαιδευτικού πακέτου « ΔιαβάΖΟΥΜΕ την πόλη» .Εκπαιδευτικές - ερμηνευτικές διαδρομές στην πόλη της Θεσσαλονίκης.
Creators: name: Ανδρώνη, Ευφροσύνη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Τοπική ιστορία Θεσσαλονίκης
Εκπαιδευτικό πακέτο « ΔιαβάΖΟΥΜΕ την πόλη»
Εκπαιδευτικές- ερμηνευτικές διαδρομές
Local history of Thessaloniki
Educational package "We read the city"
Educational- interpretive routes

description: Σκοπός της διατριβής ήταν η συσχέτιση της τοπικής ιστορίας της Θεσσαλονίκης με το εκπαιδευτικό πακέτο «ΔιαβάΖΟΥΜΕ την πόλη . Διαδρομές στην Αθήνα και τη Θεσσαλονίκη». Αρχικά αναφερθήκαμε στην ανάγκη για νέες μεθόδους διδασκαλίας μέσα στο σχολείο που σχετίζονται με βιωματικές και διαθεματικές προσεγγίσεις και προσπαθούν να μυήσουν το μαθητή στην έρευνα, την παρατήρηση, το σχολιασμό και τη συνεργασία. Ως εναλλακτική μορφή ιστορικής προσέγγισης, εξετάσαμε την περίπτωση της διδασκαλίας της Τοπικής Ιστορίας, μιας ιστορίας που ξεκινά από τα ενδιαφέροντα και τις ανάγκες της τοπικής κοινωνίας, συνδέεται με τους τοπικούς θεσμούς και ανατροφοδοτεί την τοπική ταυτότητα και αυτογνωσία. Τέλος επιχειρήσαμε μία σύνδεση του υλικού που περιέχει το πακέτο με μνημεία και ιστορικά τοπία , τοπόσημα, για την ιστορία της Θεσσαλονίκης. Πιο συγκεκριμένα, προτείναμε τη δημιουργία 4 εκπαιδευτικών – ερμηνευτικών διαδρομών για την πόλη της Θεσσαλονίκης για τις τάξεις Δ΄,Ε΄ και ΣΤ΄ με αφορμή κεφάλαια από το βιβλίο της ιστορίας , της γλώσσας και των θρησκευτικών. Η κάθε διαδρομή περιλαμβάνει ενδεικτικές δράσεις, επιτόπιες δραστηριότητες, φύλλα εργασίας, αξιολογήσεις , που εμπλουτίζουν τη διαδρομή πριν, κατά τη διάρκεια και μετά, των μαθητών στα διάφορα μνημεία, μουσεία ή αρχαιολογικούς χώρους της πόλης.
description: The aim of the present thesis is the correlation of the local history of Thessaloniki with the educational package “We read the city. Routes in Athens and Thessaloniki”. Initially we referred to the need for new methods of teaching which are related to experiential and interdisciplinary approaches which initiate the student to research, observation, annotation and collaboration. As an alternative form of historical approach, we considered the case of teaching local history which starts from the interests and needs of the local community; it is connected with local institutions and gives feedback to the local identity and self-awareness. Finally, we attempted to connect the material included in the package with monuments, historical sites and landmarks concerning the history of Thessaloniki. More specifically, we proposed the creation of four educational- interpretive routes for the city of Thessaloniki and for the fourth, fifth and sixth grade based on chapters from the books of History, Language and Religious Education. Each route includes indicative actions, on the spot activities, worksheets and evaluations which enrich the route of the students before, in the meantime and afterwards at the several monuments, museums or archaeological sites of the city
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
Binary segmentation of medical images using implicit spline representations and deep learning
Creators: name: Barrowclough, Oliver J. D.
name: Muntingh, Georg
name: Nainamalai, Varatharajan
name: Stangeby, Ivar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: I.4.6
subject: 68U10, 68T45

description: We propose a novel approach to image segmentation based on combining implicit spline representations with deep convolutional neural networks. This is done by predicting the control points of a bivariate spline function whose zero-set represents the segmentation boundary. We adapt several existing neural network architectures and design novel loss functions that are tailored towards providing implicit spline curve approximations. The method is evaluated on a congenital heart disease computed tomography medical imaging dataset. Experiments are carried out by measuring performance in various standard metrics for different networks and loss functions. We determine that splines of bidegree $(1,1)$ with $128\times128$ coefficient resolution performed optimally for $512\times 512$ resolution CT images. For our best network, we achieve an average volumetric test Dice score of almost 92%, which reaches the state of the art for this congenital heart disease dataset.
description: 17 pages, 5 figures
Towards development of optimal sequential injection analysis methods
Creators: name: Kester, Michael Dean
Publisher: name: University of British Columbia
Year: 2009

description: Currently, several research groups in the pulp and paper industry are actively pursuing the development of improved detection strategies for priority pollutants. A new technique in analytical chemistry called sequential injection analysis, may be able to provide a robust, inexpensive, automated method for detection of resin acids (known fish toxins) with appropriate use of immunochemical sensing. Most new analytical techniques, however, require fundamental studies in order to understand and optimize the physical processes that occur during the analysis. Towards this end, a dual-channel sequential injection analyzer has been designed and used for fundamental studies of dispersion. In an attempt to simplify the development of sequential injection methods, a unique graphical user interface with a virtual manifold has been proposed and implemented for control of the analyzer. The software is able to automatically and systematically manipulate over 20 instrumental parameters in search of optimal operating conditions; all information is recorded in a comprehensive database for rapid recall and display. The first dataset to be collected on the analyzer includes over 6,800 experimental dispersion profiles that were created by injection of a tracer dye. The effects of injection volume, flow rate, and manifold geometry were examined and quantified using peak moments. The random-walk model was shown to hold for sequential injection peak profiles which undergo multiple flow reversals of varying length. Optimization of the mutual penetration between two sequentially injected zones was investigated using several new descriptors for zone penetration, sensitivity, throughput and reagent economy. When the combined conditions of maximum zone penetration and sensitivity were considered, the optimal sample and reagent injection volumes were shown to be independent of manifold length and flow rate. To gain further insight into the sequential injection technique, a computer simulation based on the random-walk model was proposed and implemented. A unique injection procedure was demonstrated, which simulates the sequential loading of multiple zones, in addition to the flow reversal process. Simulated dispersion profiles agree well with experimental dispersion profiles created under laminar flow conditions. Visualization of the theoretical concentration profiles which occur during injection and flow reversal allowed prediction of improved sensitivity at the point of zero net fluid movement.
Εξέταση εναλλακτικών λύσεων από τεχνικής, οικονομικής και γεωστρατηγικής άποψης, για την παροχέτευση υδρογονανθράκων από την Ανατολική Μεσόγειο προς την Ευρωπαϊκή Ένωση
Creators: name: Χατζηκυριακίδης, Γεώργιος Πολύκαρπου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Υδρογονάνθρακες
Ανατολική Μεσόγειος
Λύσεις
Hydrocarbons
Eastern Mediterranean
Solutions
Kohlenwasserstoffen
östlichen Mittelmeerraum
Lösungen

description: Αντικείμενο της παρούσας εργασίας αποτελεί η διερεύνηση εναλλακτικών λύσεων για την παροχέτευση υδρογονανθράκων από την Ανατολική Μεσόγειο προς την Ευρωπαϊκή Ένωση, και κυρίως τον πυρήνα της, εξετάζοντας το θέμα από την τεχνική, την οικονομική και τη γεωστρατηγική του σκοπιά. Η έρευνα έγινε σε άμεση σχέση με την Ελλάδα και την Κύπρο, ήτοι τον Ελληνισμό -με συνοπτικές βέβαια αναφορές και σε άλλες χώρες της Ανατολικής Μεσογείου, όπου κρίθηκε αναγκαίο- δίνοντας επίσης ιδιαίτερη έμφαση στην Ευρωπαϊκή Πολιτική και στο Ευρωπαϊκό Δίκαιο της Ενέργειας. Στο πρώτο μέρος της εργασίας εξετάζεται υπό το πρίσμα του ευρωπαϊκού πλαισίου ενέργειας, το περιβάλλον και η κατάσταση της Ανατολικής Μεσογείου. Εν συνεχεία, εξετάζεται ο ρόλος του λεγόμενου ελληνισμού στην περιοχή, και τα όποια προβλήματα - συμφωνίες υπάρχουν μεταξύ των κρατών της περιοχής καθώς και οι περιορισμοί. Στο δεύτερο μέρος της εργασίας εξετάζονται οι επικρατέστερες λύσεις για την παροχέτευση Υ/Α της Ανατολικής Μεσογείου προς τις υπάρχουσες αγορές, με επίκεντρο την αγορά της Ε.Ε. Προτείνεται η βέλτιστη λύση αξιοποίησης και μεταφοράς των Υ/Α της Ανατολικής Μεσογείου προς την Ε.Ε και αναφέρονται τα οφέλη της προτεινόμενης λύσης στον Ελληνισμό. Τέλος, σε όλο το φάσμα της εργασίας εξετάζονται ειδικότερα ζητήματα που άπτονται του επαγγέλματος ενός μηχανικού, όπως επίσης και η συμβατότητα των περιορισμών με το Ενωσιακό Δίκαιο.
description: The purpose of this paper is to investigate alternative solutions for the drainage of hydrocarbons from the Eastern Mediterranean to the European Union, especially its core, by looking at the issue from its technical, economic and geostrategic point of view. The survey was conducted in a direct relationship with Greece and Cyprus, ie Hellenism - with brief references to other countries of the Eastern Mediterranean, where it was deemed necessary - with a special emphasis on European Politics and European Energy Law. The first part of the thesis is examined in the light of the European Energy Framework, the environment and the situation of the Eastern Mediterranean. Next, the role of so-called Hellenism in the region, and any problems - agreements between the states of the region and the constraints. The second part of the thesis examines the most prevalent solutions for the East Mediterranean hydrocarbon’s pipeline to the existing markets, focusing on the EU market. The optimal solution for the utilization and transfer hydrocarbons of the East Mediterranean to the EU is proposed and outlines the benefits of the proposed solution to Hellenism. Finally, in the whole spectrum of the thesis, issues related to the profession of engineer are examined, as well as the compatibility of the constraints with EU law.
The pattern of accretion flow onto Sgr A*
Creators: name: Moscibrodzka, Monika
name: Das, Tapas K.
name: Czerny, Bozena
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The material accreting onto Sgr A* most probably comes from the nearby stars. We analyze the pattern of this flow at distances of a fraction of a parsec and we argue that the net angular momentum of this material is low but non-negligible, and the initially supersonic disk accretion changes into subsonic flow with constant angular momentum. Next we estimate the flow parameters at a distance $R_{BHL}$ from the black hole and we argue that for the plausible parameter range the accretion flow is non-stationary. The inflow becomes supersonic at distance of $\sim 10^4 R_g$ but the solution does not continue below the horizon and the material piles up forming a torus, or a ring, at a distance of a few up to tens of Schwarzchild radii. Such a torus is known to be unstable and may explain strong variability of the flow in Sgr A*. Our considerations show that the temporary formation of such a torus seems to be unavoidable. Our best fitting model predicts a rather large accretion rate of around $4 \cdot 10^{-6} M_{\odot}/yr$ directly on Sgr A*. We argue that magnetic fields in the flow are tangled and this allows our model to overcome the disagreement with the Faraday rotation limits.
description: 10 pages,7 figures, accepted to MNRAS, references added to section 3.5 and to bibliography
Texto: Regina Jalapyjtasi casou na aldeia dos Mỹky
Creators: name: Jalapyjtasi, Regina
name: Bardagil Mas, Bernat
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: Manoki language

description: Enquanto limpa algodão coletado da roça, Regina Jalapyjtasi conta como conheceu Matyxi, um jovem no grupo recém contatado dos Mỹky nos anos 1970, e foi casar come ele.
While taking the seeds out of the cotton from her field, Regina Jalapyjtasi recounts how she met Matyxi, a young man in the recently contacted Mỹky group in the 1970s, and married him.
An Infinite Number of Static Soliton Solutions to 5D Einstein-Maxwell Equations
Creators: name: Azuma, Takahiro
name: Koikawa, Takao
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The soliton technique is applied to the 5D static Einstein-Maxwell equations, and an infinite number of solutions are explicitly obtained. We study the rod structure of 2-soliton solutions and we show that the 5D Reissner-Nordstrom solution and the 5D Majumdar-Papapetrou solution are included as the 2-soliton solutions.
description: 16 pages
Inflation with $R_{(αβ)}$ terms in the Palatini formulation
Creators: name: Annala, Jaakko
name: Rasanen, Syksy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study inflation with the most general non-degenerate gravitational action that depends on the symmetric part of the Ricci tensor coupled to a scalar field in the Palatini formulation of gravity. We use field redefinitions to shift the effect of the Ricci terms from gravity to the scalar field, and apply the result to slow-roll inflation. As examples, we consider actions quadratic and cubic in the Ricci tensor. In the quadratic case the results are similar to the case $R+αR^2$ that has been studied earlier: the tensor-to-scalar ratio $r$ can be suppressed by an arbitrary amount, while the scalar spectrum is unaffected. In the cubic case, $r$ can be suppressed by at most a factor of $2/9$, and the change in the scalar spectral index $n_s$ can be large.
description: 12+4 pages, 2 figures. v2: added references, clarified text. v3: added a reference, clarified text. Published version
The spectra of the spherical and euclidean triangle groups
Creators: name: Harmer, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 14L35, 47A75, 20C99

description: We derive the spectrum of the Laplace-Beltrami operator on the quotient orbifold of the non hyperbolic triangle groups.
description: accepted in the Journal of the Australian Mathematical Society
Dynamical simulations of QCD at finite temperature with a truncated perfect action
Creators: name: Shcheredin, Stanislav
name: Laermann, Edwin
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The Hypercube operator determines a variant of the approximate, truncated perfect fermion action. In this pilot study we are going to report on first experiences in dynamical QCD simulations with the Hypercube fermions. We apply this formulation in an investigation of the finite temperature transition for two flavours. On lattices of size $8^3\times 4$ we explore the phase diagram. Physical scales are estimated from pseudoscalar and vector meson masses obtained on $8^3\times 16$ lattices. We observe the presence of a metastability region but do not find evidence for an Aoki phase. The Hypercube operator allows us to simulate at ratios of pseudoscalar to vector meson masses at least as small as 0.8 at the thermal crossover at $N_t=4$, which renders this formulation cheaper than the Wilson like fermions.
description: 7 pages, 8 figures, talk presented at Lattice 2006 (High temperature and density)
Demonstration of Panda: A Weakly Supervised Entity Matching System
Creators: name: Wu, Renzhi
name: Sakala, Prem
name: Li, Peng
name: Chu, Xu
name: He, Yeye
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Entity matching (EM) refers to the problem of identifying tuple pairs in one or more relations that refer to the same real world entities. Supervised machine learning (ML) approaches, and deep learning based approaches in particular, typically achieve state-of-the-art matching results. However, these approaches require many labeled examples, in the form of matching and non-matching pairs, which are expensive and time-consuming to label. In this paper, we introduce Panda, a weakly supervised system specifically designed for EM. Panda uses the same labeling function abstraction as Snorkel, where labeling functions (LF) are user-provided programs that can generate large amounts of (somewhat noisy) labels quickly and cheaply, which can then be combined via a labeling model to generate accurate final predictions. To support users developing LFs for EM, Panda provides an integrated development environment (IDE) that lives in a modern browser architecture. Panda's IDE facilitates the development, debugging, and life-cycle management of LFs in the context of EM tasks, similar to how IDEs such as Visual Studio or Eclipse excel in general-purpose programming. Panda's IDE includes many novel features purpose-built for EM, such as smart data sampling, a builtin library of EM utility functions, automatically generated LFs, visual debugging of LFs, and finally, an EM-specific labeling model. We show in this demo that Panda IDE can greatly accelerate the development of high-quality EM solutions using weak supervision.
description: video can be found at https://chu-data-lab.cc.gatech.edu/ml-for-data-integration/
Λαθρεμπορία Πετρελαιοειδών
Creators: name: Δόλλας, Νικόλαος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Λαθρεμπορία
Πετρελαιοειδή
Λαθρεμπορία Πετρελαιοειδών
Smuggling
Oil
Oil Smuggling

description: Σκοπός της παρούσας διπλωματικής εργασίας, με τίτλο “Λαθρεμπορία Πετρελαιοειδών”, ήταν η παρουσίαση της λαθρεμπορίας πετρελαιοειδών, με αναφορά κυρίως στο πετρέλαιο και το υγραέριο. Έγινε παράθεση της ισχύουσας κοινοτικής και εθνικής νομοθεσίας, που έχει θεσπιστεί και διέπει την αγορά πετρελαιοειδών από άποψη λειτουργίας, φορολογικής μεταχείρισης, αλλά και από άποψη επιβολής κυρώσεων, διοικητικών και ποινικών, σε περίπτωση μη τηρήσεως των οικείων διατάξεων. Παρουσιάστηκε ο κλάδος διύλισης και εμπορίας πετρελαιοειδών, η εγχώρια αγορά πετρελαιοειδών και καυσίμων και τα ιδιαίτερα χαρακτηριστικά αυτής, οι περιπτώσεις που παρατηρείται το φαινόμενο της λαθρεμπορίας, καθώς και τρόποι αντιμετώπισής της. Τέλος, παρατίθεται παράρτημα της ευρωπαϊκής και εθνικής νομοθεσίας, που διέπει τα πετρελαιοειδή
description: The aim of the present thesis, entitled “Oil Smuggling”, was the study of it, with emphasis in oil and LPG (Liquefied Petroleum Gas). Reference has been made to the existing EU and national legislation, that governs the petroleum market products in terms of operation, taxation, but also in terms of penalties, administrative and penal, in the event of failure to comply with the relevant provisions. It also refers to the oil refining and trading sector, the domestic market for petroleum products and fuels and its special characteristics, the cases where the oil smuggling occurs and how to deal with it. In the end, an annex to the European and national legislation governing petroleum products is set out
Metamaterial Coatings for Broadband Asymmetric Mirrors
Creators: name: Chen, Aiqing
name: Hasegawa, Keisuke
name: Deutsch, Miriam
name: Podolskiy, Viktor A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on design and fabrication of nano-composite metal-dielectric thin film coatings with high reflectance asymmetries. Applying basic dispersion engineering principles to model a broadband and large reflectance asymmetry, we obtain a model dielectric function for the metamaterial film, closely resembling the effective permittivity of disordered metal-dielectric nano-composites. Coatings realized using disordered nanocrystalline silver films deposited on glass substrates confirm the theoretical predictions, exhibiting symmetric transmittance, large reflectance asymmetries and a unique flat reflectance asymmetry.
description: 4 pages, 4 figures, submitted to Optics Letters
Bilingual Alignment Pre-Training for Zero-Shot Cross-Lingual Transfer
Creators: name: Yang, Ziqing
name: Ma, Wentao
name: Cui, Yiming
name: Ye, Jiani
name: Che, Wanxiang
name: Wang, Shijin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Multilingual pre-trained models have achieved remarkable performance on cross-lingual transfer learning. Some multilingual models such as mBERT, have been pre-trained on unlabeled corpora, therefore the embeddings of different languages in the models may not be aligned very well. In this paper, we aim to improve the zero-shot cross-lingual transfer performance by proposing a pre-training task named Word-Exchange Aligning Model (WEAM), which uses the statistical alignment information as the prior knowledge to guide cross-lingual word prediction. We evaluate our model on multilingual machine reading comprehension task MLQA and natural language interface task XNLI. The results show that WEAM can significantly improve the zero-shot performance.
description: 5 pages; accepted to MRQA 2021 @ EMNLP 2021
Χρηματοδότηση Διευρωπαϊκών Ενεργειακών Υποδομών
Creators: name: Μητσιούλη, Χρυσούλα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Διευρωπαϊκές Υποδομές
Ομόλογα Έργου
Επενδύσεις
Trans-European Infrastructure
Project Bonds
Investments

description: Η παρούσα μεταπτυχιακή εργασία, που εκπονήθηκε σε χρόνο κατά τον οποίο η Ευρώπη σύσσωμη και με θέρμη επιχειρούσε προς το σκοπό της επίτευξης των στόχων για το 2020, πραγματεύεται τα διευρωπαϊκά δίκτυα στο γενικό πλαίσιο της ανάπτυξης των υποδομών στη γηραιά ήπειρο ως προϋπόθεση της ενεργειακής ασφάλειας και κοινωνικής ευημερίας. Μέσα από μια σύντομη ιστορική ανασκόπηση διαφαίνεται ο καταλυτικός ρόλος που διαδραμάτισε το τρίτο ενεργειακό πακέτο στη λειτουργία της εσωτερικής αγοράς. Περαιτέρω γίνεται εκτενής αναφορά στους φορείς οικονομικής ενίσχυσης των διευρωπαϊκών υποδομών, τέλος δε παρουσιάζονται αναλυτικά οι διαφορετικοί εναλλακτικοί τύποι της χρηματοδότησης των εν λόγω ενεργειακών έργων.
description: The present post-graduate thesis, which was conducted at a time when Europe has been working hard to achieve the targets of 2020, deals with trans-European networks in the general context of infrastructure development in the old continent as a prerequisite for energy safety and social well-being. A brief historical review reveals the catalytic role of the third energy package in the functioning of the internal market. Furthermore, there is an extensive reference to the financial aid for the trans-European infrastructure, and finally the different types of financing of the said energy projects.
Η επίδραση της μεταβολής της στάθμης της θάλασσας της Ανατολικής Μεσογείου στην δημιουργία ιζηματογενών ακολουθιών στην Λεβαντίνη λεκάνη και ο ρόλος τους στην δημιουργία κοιτασμάτων υδρογονανθράκων
Creators: name: Ανδρέου, Ανδρέας Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Λεβαντίνη λεκάνη
Ανατολική Μεσόγειος
Κοιτάσματα υδρογονανθράκων
Levantine basin
Eastern Mediterranean
Hydrocarbon deposits

description: Η περιοχή της Ανατολικής Μεσογείου παρουσιάζει μεγάλο ενδιαφέρον στο θέμα γένεσης και ανάπτυξης κοιτασμάτων υδρογονανθράκων. Η παρούσα Μεταπτυχιακή Διπλωματική Εργασία πραγματεύεται την τεκτονική αλλά και στρωματογραφική εξέλιξη της Λεβαντίνης λεκάνης, καθώς και την προέλευση των ιζημάτων που την πλήρωσαν και αν αυτά είναι ικανά να οδηγήσουν σε γένεση υδρογονανθράκων. Επιπλέον, παρουσιάζονται οι διαδικασίες που απαιτούνται ώστε να υπάρξει ανάπτυξη ενός κοιτάσματος. Παρατίθεται και περιγράφεται αναλυτικά η ακολουθία της Λεβαντίνης και μέσω σεισμικών τομών προσδιορίζονται πιθανές θέσεις υδρογονανθράκων. Τέλος γίνεται μια αναφορά στα πιο πρόσφατα ανακαλυφθέντα κοιτάσματα της Λεκάνης και εξάγονται συμπεράσματα που αφορούν στην ύπαρξη συστημάτων υδρογονανθράκων τα οποία μπορούν να παράξουν τεράστιες ποσότητες υδρογονανθράκων και να τροφοδοτήσουν πολλές δομές παγίδευσης σε όλη την Ανατολική Μεσόγειο.
description: The region of Eastern Mediterranean Sea is of a great interest in reference to the topic of genesis and development of hydrocarbon deposits. The present Master Thesis deals with the tectonic and stromatographic evolution of Levantine Basin as well as the origin of the sediments that have filled it and whether they are capable of generating hydrocarbons. Additionally, the processes required to develop a field are presented. The sequence stratigraphy of the Levantine is listed and described in detail and through seismic section potential hydrocarbon positions are identified. Finally, a reference is made to the most recent discoveries of the basin and conclusions are drawn regarding the existence of hydrocarbon systems which can produce massive quantities of hydrocarbons and charge many structural traps across the whole of Eastern Mediterranean.
description: Σε συνεργασία με: Γεωλογίας και Γεωπεριβάλλοντος (Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών), Μηχανικών Μεταλλείων Μεταλλουργών (Εθνικό Μετσόβιο Πολυτεχνείο, Οικονομικών Επιστημών (Δημοκρίτειο Πανεπιστήμιο Θράκης))
Cantos na beira do fogo
Creators: name: Kanuxi, Edinei
name: Kanuxi, Manoel
name: Bardagil Mas, Bernat
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: Manoki language

description: Manoel Kanuxi e Edinei Kanuxi conversam sobre os cantos Manoki, de como as mães já não cantam para as crianças como antigamente. Também cantam juntos algumas canções.
Manoel Kanuxi and Edinei Kanuxi talk about Manoki singing, and how nowadays mothers do not sing to their children like they used to. They sing some Mỹky-language songs.
Quantum Depletion of a Soliton Condensate
Creators: name: Huang, Guoxiang
name: Deng, L.
name: Yan, Jiaren
name: Hu, Bambi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present rigorous results on the diagonalization of Bogoliubov Hamilto- nian for a soliton condensate. Using the complete and orthonomalized set of eigenfunction for the Bogoliubov de Gennes equations, we calculate ex- actly the quantum depletion of the condensate and show that two degenerate zero-modes, which originate from a U(1) guage- and a translational-symmetry breaking of the system, induce the quantum diffusion and transverse instabil- ity of the soliton condensate.
description: 11 pages
Multi-interacting dark energy and its cosmological implications
Creators: name: Lucca, Matteo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the effort to define the main features a successful solution to the Hubble tension should have, growing evidence has emerged pointing to the need for models able to modify the expansion (and possibly thermal) history of the universe both prior and after recombination, and that could thereby restore the overall concordance between early- and late-time observations without introducing nor worsening other cosmological tensions in the process. In precisely this spirit, here we consider a multi-interacting dark energy model with two complementary interaction channels: one with the dark matter and one with the photons. The former most significantly affects the matter dominated epoch as well as the very late universe, and has been shown to be able to significantly resolve the $S_8$ tension. The latter has been introduced in this work to allow for a larger and natural time dependence of the evolution of the universe since it mostly impacts the radiation dominated epoch as well as the temperature scaling of the photons, as extensively explained in the text. As a result, considering data from Planck+BAO+Pantheon+KV450+DES (which can be combined since the $S_8$ value is lowered even neglecting the weak lensing data) we find that the significance of the $H_0$ tension only reduces to about 3.5$σ$, while that of the $S_8$ tension falls below the 2$σ$ level. Also, the statistical analysis we perform strongly favors $Λ$CDM in all considered cases. Overall, we conclude that the specific multi-interacting dark energy model considered here, despite its broad generality and very rich cosmological phenomenology, cannot successfully restore the aforementioned overall concordance between early- and late-time observations.
description: 14+5 pages with 9 figures and 2 tables, published version
Analytical results for the distribution of first hitting times of random walks on random regular graphs
Creators: name: Tishby, Ido
name: Biham, Ofer
name: Katzav, Eytan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present analytical results for the distribution of first hitting times of random walks (RWs) on random regular graphs (RRGs) of degree $c \ge 3$ and a finite size $N$. Starting from a random initial node at time $t=1$, at each time step $t \ge 2$ an RW hops randomly into one of the $c$ neighbors of its previous node. In some of the time steps the RW may hop into a yet-unvisited node while in other time steps it may revisit a node that has already been visited before. The first time at which the RW enters a node that has already been visited before is called the first hitting time or the first intersection length. The first hitting event may take place either by backtracking (BT) to the previous node or by retracing (RET), namely stepping into a node which has been visited two or more time steps earlier. We calculate the tail distribution $P( T_{\rm FH} > t )$ of first hitting (FH) times as well as its mean $\langle T_{\rm FH} \rangle$ and variance ${\rm Var}(T_{\rm FH})$. We also calculate the probabilities $P_{\rm BT}$ and $P_{\rm RET}$ that the first hitting event will occur via the backtracking scenario or via the retracing scenario, respectively. We show that in dilute networks the dominant first hitting scenario is backtracking while in dense networks the dominant scenario is retracing and calculate the conditional distributions $P(T_{\rm FH}=t| {\rm BT})$ and $P(T_{\rm FH}=t| {\rm RET})$, for the two scenarios. The analytical results are in excellent agreement with the results obtained from computer simulations. Considering the first hitting event as a termination mechanism of the RW trajectories, these results provide useful insight into the general problem of survival analysis and the statistics of mortality rates when two or more termination scenarios coexist.
description: 28 pages, 12 figures, 1 table
Photoexcitation of $^{76}$Ge
Creators: name: Schwengner, R.
name: Massarczyk, R.
name: Schmidt, K.
name: Zuber, K.
name: Beyer, R.
name: Bemmerer, D.
name: Hammer, S.
name: Hartmann, A.
name: Hensel, T.
name: Hoffmann, H. F.
name: Junghans, A. R.
name: Kögler, T.
name: Müller, S. E.
name: Pichotta, M.
name: Turkat, S.
name: Turko, J. A. B.
name: Urlaß, S.
name: Wagner, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The dipole strength of the nuclide $^{76}$Ge was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.8 and 12.3 MeV at the $γ$ELBE facility. We identified 210 levels up to an excitation energy of 9.4 MeV and assigned spin $J$ = 1 to most of them. The quasicontinuum of unresolved transitions was included in the analysis of the spectra and the intensities of branching transitions were estimated on the basis of simulations of statistical $γ$-ray cascades. The photoabsorption cross section up to the neutron-separation energy was determined and is compared with predictions of the statistical reaction model. The derived photon strength function is compared with results of experiments using other reactions.
description: 12 pages, 9 figures
Μετάφραση του παιδικού παραμυθιού με τίτλο Piri-Piri e il caso della sparizione della statua. Luisa Marihno Antunes, Libreria Ticinum Editore
Creators: name: Σαϊνατούδη, Αικατερίνη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Άγαλμα
Έρευνα
Εξαφάνιση
Statue
Research
Disappearance

description: Η εργασία αυτή έγινε στα πλαίσια του μεταπτυχιακού προγράμματος σπουδών «Μετάφραση, επικοινωνία και εκδοτικός χώρος» της φιλοσοφικής σχολής του ΑΠΘ, του τμήματος Ιταλικής γλώσσας και φιλολογίας. Πρόκειται για τη σχολιασμένη μετάφραση κάποιων τμημάτων ενός ιταλικού παιδικού βιβλίου, τα οποία τμήματα παρουσιάζουν ενδιαφέρον από άποψη ονοματοδοσίας και τυπικών ιταλικών εκφράσεων. Η προσπάθεια όλης της εργασίας οργανώνεται γύρω από την όσο το δυνατόν καλύτερη απόδοση των ονομάτων των ηρώων του βιβλίου και των καθημερινών εκφράσεων, οι οποίες να μπορούν να γίνουν κατανοητές από το ελληνικό κοινό, πάντα όμως με σεβασμό προς το πρωτότυπο κείμενο.
description: This master dissertation has been written during the post graduate program called “Translation, communication and publishing” of the school of Philosophy of Aristotle University of Thessaloniki, faculty of Italian Language and Literature. It’s about a commented translation of some parts of an Italian children’s book. These particular parts of the book are interesting because they include names and typical Italian phrases. The whole effort of this master dissertation is organized in order to interpret the names of the heroes in the book and the typical Italian phrases in a way that can be understood by the Greek readers without altering the idea of the original text.
Materials required to run an oral rehydration practical
Creators: name: Langton, Phil
Publisher: name: figshare
Year: 2021
Subjects: subject: Physiology
subject: FOS: Biological sciences

description: The files (MS Word format) are versions of the workbook that could be used for medical and veterinary student education. The pdf file is a primer on the relevant physiology intended as background.
Σύνθεση και μελέτη ετεροληπτικών φωταυγών συμπλόκων του χαλκού(I) με ετεροκυκλικά θειολικά ιόντα, φωσφίνες και διιμίνες
Creators: name: Στυλίδου, Βιλελμίνη Αχιλλέας
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Χαλκός (I)
Φωταυγή σύμπλοκα
Θειοαμίδια
Copper (I)
Luminescent complexes
Thioamidate

description: Οι συσκευές τύπου OLED είναι μια νέα αναπτυσσόμενη τεχνολογία συσκευών τεχνητού φωτισμού που εμφανίζει μεγάλες αποδόσεις εκπομπής, λαμπερά χρώματα, μικρές ενεργειακές απώλειες και μεγάλη δυναμική ανάπτυξης. Η λειτουργία τους βασίζεται στην ηλεκτροφωταύγεια ενός οργανικού ή υβριδικού μεταλλο-οργανικού υλικού, όπως π.χ. φωσφορίζοντα σύμπλοκα βαρέων και πολύτιμων ιόντων μεταβατικών μετάλλων (Ir(III), Pt(II)). Μια εναλλακτική, χαμηλότερου κόστους και περιβαλλοντικά φιλική προσέγγιση περιλαμβάνει τη χρήση φωταυγών συμπλόκων του Cu(Ι) ως υλικά εκπομπής. Στο πλαίσιο της ανάπτυξης νέων φωταυγών συμπλόκων του Cu(Ι) με μεγάλες αποδόσεις εκπομπής και πιθανότητα χρήσης σε συσκευές τύπου OLED, στην παρούσα εργασία παρουσιάζονται δύο σειρές νέων συμπλόκων του Cu(I): (α) τρις-ετεροληπτικά σύμπλοκα με ligand φωσφίνη/διιμίνη/ετεροκυκλικό θειοαμιδικό ιόν και (β) δις-ετεροληπτικά σύμπλοκα με ligand διφωσφίνη/ετεροκυκλικό θειοαμιδικό ιόν. Η ταυτότητα των συμπλόκων όσο και ο τρόπος συναρμογής των διαφόρων ligand στο μεταλλικό κέντρο επιβεβαιώθηκε τόσο από με τη χρήση κρυσταλλογραφικών όσο και με τη χρήση φασματοσκοπικών δεδομένων. Mελέτη των συμπλόκων με φασματοσκοπία εκπομπής σε θερμοκρασία δωματίου, στη στερεά κατάσταση καταδεικνύει τον έντονα φωταυγή χαρακτήρα τους, ενώ θεωρητικοί υπολογισμοί τύπου DFT χρησιμοποιήθηκαν για τον προσδιορισμό του χαρακτήρα της εκπέμπουσας διεγερμένης κατάστασής τους.
description: Organic Light-Emitting Diodes (OLEDs) is an emerging, artificial lighting technology which exhibits high performance, high color rendering, low energy losses and great growth potential. Its operating mechanism is based on the electroluminescence of an organic or hybrid organic/inorganic material, such as phosphorescent complexes of heavy and precious metal ions (Ir(III), Pt(II)). An alternative, low cost and environmentally friendly approach involves the use of luminescent Cu(I) complexes as emission materials. In the context of the development of new, highly emissive Cu(I) complexes for potential use in OLEDs, two sets of new luminescence Cu(I) complexes are presented herein: (a) tris-heteroleptic phosphine/diimine/N-heterocyclic thioamidate complexes and (b) bis-heteroleptic diphosphine/N-heterocyclic thioamidate complexes. The identity of the complexes, as well as the coordination mode of the ligands, have been confirmed both by X-ray crystallographic studies and spectroscopic data. Room-temperature, solid-state fluorescence spectroscopy measurements of the complexes demonstrate their intense luminescent character, while DFT theoretical calculations were used to determine the nature of their emitting excited state.
A Near-Infrared and X-ray Study of W49B: A Wind Cavity Explosion
Creators: name: Keohane, Jonathan W.
name: Reach, William T.
name: Rho, Jeonghee
name: Jarrett, Thomas H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present near-infrared narrow-band images of the supernova remnant W49B, taken with the WIRC instrument on the Hale 200 inch telescope on Mt. Palomar. The 1.64 micron [Fe II] image reveals a barrel-shaped structure with coaxial rings, which is suggestive of bipolar wind structures surrounding massive stars. The 2.12 micron shocked molecular hydrogen image extends 1.9 pc outside of the [Fe II] emission to the southeast. We also present archival Chandra data, which show an X-ray jet-like structure along the axis of the [Fe II] barrel, and flaring at each end. Fitting single temperature X-ray emission models reveals: an enhancement of heavy elements, with particularly high abundances of hot Fe and Ni, and relatively metal-rich core and jet regions. We interpret these findings as evidence that W49B originated inside a wind-blown bubble (R ~ 5 pc) interior to a dense molecular cloud. This suggests that W49B's progenitor was a supermassive star, that could significantly shape its surrounding environment. We also suggest two interpretations for the jet morphology, abundance variations and molecular hydrogen emission: (1) the explosion may have been jet-driven and interacting with the molecular cavity (i.e. a Gamma-ray burst); or (2) the explosion could have been a traditional supernova, with the jet structure being the result of interactions between the shock and an enriched interstellar cloud.
description: 9 pages with embedded figures Accepted by the Astrophysical Journal
Light Higgs boson from multi-phase criticality in dynamical symmetry breaking
Creators: name: Kannike, Kristjan
name: Marzola, Luca
name: Raidal, Martti
name: Strumia, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Coleman-Weinberg mechanism can realise different phases of dynamical symmetry breaking. In each phase a combination of scalars, corresponding to the pseudo-Goldstone boson of scale invariance, has a loop-suppressed mass. We show that additional scalars, beyond the pseudo-Goldstone bosons, can become light at critical points in the parameter space where two different phases co-exist. We present a minimal implementation of the mechanism in multi-scalar models, detailing how loop-suppressed masses and mixings can be computed. We discuss realisations of the resulting multi-phase criticality principle and its relevance to the case of the Higgs boson.
description: 10 pages, 2 figures, version accepted in PLB
Gluon Condensation at Finite Temperature via AdS/CFT
Creators: name: Kim, Youngman
name: Lee, Bum-Hoon
name: Park, Chanyong
name: Sin, Sang-Jin
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider gluon condensation (GC) at finite temperature using AdS/CFT. We first show that in the presence of regular horizon, the GC is forbidden in high temperature. Then we consider gravity back-reaction to dilaton coupling and show that the back-reaction develops an singularity, and non-vanishing value of gluon condensation is allowed. We also study thermodynamic quantities and the trace anomaly in the presence of the GC. We discuss how to define a temperature in the presence of the singularity which forbids Hawking temperature. Finally we describe the thermodynamics of the gluon condensation including the effect of the Hawking-Page transition.
description: 15 pages, 2 figures, added references and comments