cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Precessing magnetars as central engines in short gamma-ray bursts
Creators: name: Suvorov, Arthur G.
name: Kokkotas, Kostas D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Short gamma-ray bursts that are followed by long-duration X-ray plateaus may be powered by the birth, and hydrodynamic evolution, of magnetars from compact binary coalescence events. If the rotation and magnetic axes of the system are not orthogonal to each other, the star will undergo free precession, leading to fluctuations in the luminosity of the source. In some cases, precession-induced modulations in the spin-down power may be discernible in the X-ray flux of the plateau. In this work, 25 X-ray light curves associated with bursts exhibiting a plateau are fitted to luminosity profiles appropriate for precessing, oblique rotators. Based on the Akaike Information Criterion, 16 (64 per cent) of the magnetars within the sample display either moderate or strong evidence for precession. Additionally, since the precession period of the star is directly tied to its quadrupolar ellipticity, the fits allow for an independent measure of the extent to which the star is deformed by internal stresses. Assuming these deformations arise due to a mixed poloidal-toroidal magnetic field, we find that the distribution of magnetic-energy ratios is bimodal, with data points clustering around energetically equal and toroidally dominated partitions. Implications of this result for gravitational-wave emission and dynamo activity in newborn magnetars are discussed.
description: 15 pages, 6 figures, 4 tables. Matches published version in MNRAS
Ασφάλεια περιβαλλόντων ηλεκτρονικού εμπορίου
Creators: name: Αυγουστίδου, Μαρία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Ηλεκτρονικό εμπόριο
Ασφάλεια
Κρυπτογραφία
Ψηφιακές υπογραφές
Ακεραιότητα δεδομένων
Τείχος προστασίας
E-commerce
Security
Digital signatures
Cryptography
Data integrity
Firewall

description: Η εργασία ασχολείται με τον τρόπο με τον οποίο μπορεί να επιτευχθεί η ασφάλεια σε περιβάλλον ηλεκτρονικού εμπορίου. Αρχικά παρατίθενται κάποιες βασικές έννοιες, όπως αυτή του ηλεκτρονικού εμπορίου και της Ασφάλειας. Στη συνέχεια, γίνεται αναφορά στις απαιτήσεις και τις λειτουργίες που οφείλουν να έχουν τα λογισμικά που σχετίζονται με το ηλεκτρονικό εμπόριο, προκειμένου να επιτευχθεί η ασφάλεια. Επίσης, περιγράφονται αναλυτικά οι διαθέσιμες τεχνολογίες ασφάλειας, ενώ παρουσιάζονται και κάποια συστήματα που υποστηρίζουν τις τεχνολογίες αυτές. Γίνεται επίσης αναφορά στους κινδύνους στους οποίους υπόκειται η ασφάλεια εφαρμογών, και στους κυριότερους τρόπους αντιμετώπισής τους. Τέλος παρουσιάζονται ορισμένες εφαρμογές ηλεκτρονικού εμπορίου, καθώς και τα ζητήματα ασφάλειας που προκύπτουν κατά τη λειτουργία τους
description: The thesis deals with the way with which security can be achieved in e-commerce environments. At first, certain basic significances are mentioned, such as E-commerce and Security. At second, some requirements and operations, that all the softwares which are connected with E-commerce should include, are referred. There is also, the description of all these available security technologies, which some systems which support these technologies are presented. The dangers which some e-commerce applications deal with, and the most important ways of facing them are also referred. Finally, some e-commerce application and matters that have to do with their security, are presented
Διδασκαλία και μάθηση στην ψηφιακή εποχή. Το παράδειγμα του μαθήματος των Θρησκευτικών
Creators: name: Νέτσικας, Κωνσταντίνος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Δευτεροβάθμια εκπαίδευση
ΤΠΕ
Θρησκευτικά
Secondary School Education
ICT
Religious Education

description: Η πανδημία μεταξύ άλλων επέδρασε καταλυτικά στον χώρο της εκπαίδευσης μεταβάλλοντας τις διδακτικές στρατηγικές και μεθόδους και κατά συνέπεια απαιτώντας νέες μαθησιακές δεξιότητες από τους μαθητές. Εντούτοις, έρευνες οι οποίες βρίσκονται σε εξέλιξη αποκαλύπτουν το γεγονός ότι ένα σημαντικό ποσοστό των σημερινών μαθητών και των εκπαιδευτικών δεν διαθέτουν τον προαπαιτούμενο ψηφιακό γραμματισμό, προκειμένου να ανταποκριθούν στις νέες συνθήκες διδασκαλίας και μάθησης. Η Ευρωπαϊκή Επιτροπή έχει ήδη εκπονήσει ένα νέο Σχέδιο Δράσης για την Ψηφιακή Εκπαίδευση το οποίο στοχεύει αφενός στη δημιουργία των προϋποθέσεων για την ανάπτυξη ενός ψηφιακού εκπαιδευτικού οικοσυστήματος και αφετέρου στην ενίσχυση του ψηφιακού γραμματισμού των μαθητών και των εκπαιδευτικών με απώτερο σκοπό την καλλιέργεια της κριτικής σκέψης των πολιτών. Αναμφισβήτητα, η μεταβολές που επιφέρει η χρήση της τεχνολογίας στην εκπαίδευση αποτελούν προκλήσεις με θετικές προοπτικές αλλά και σημαντικούς κινδύνους τόσο για τα εκπαιδευτικά συστήματα όσο και για τα επιμέρους γνωστικά αντικείμενα που διδάσκονται στο σχολική εκπαίδευση. Με βάση τα παραπάνω ο βασικός ερευνητικός άξονας της διπλωματικής εργασίας αφορά στις μεταβολές που ο ψηφιακός μετασχηματισμός επιφέρει στη διδασκαλία και τη μάθηση των Θρησκευτικών, τις νέες προκλήσεις και τις προοπτικές αλλά και τους κινδύνους που ελλοχεύουν.
description: The pandemic, among other things, has had a catalytic effect on the field of education, changing teaching strategies and methods and consequently requiring new learning skills from students. However, ongoing research reveals the fact that a significant proportion of today's students and teachers do not have the required digital literacy to respond to the new teaching and learning conditions. The European Commission has already developed a new Digital Education Action Plan which aims to create the conditions for the development of a digital education ecosystem and to enhance the digital literacy of students and teachers with a view to fostering critical thinking among citizens. Undoubtedly, the changes brought about by the use of technology in education are challenges with positive prospects but also significant risks both for education systems and for the individual subjects taught in school education. Based on the above, the main research axis of the diploma thesis concerns the changes that digital transformation brings to the teaching and learning of Religion, the new challenges and prospects but also the risks that lurk.
Energy gaps, magnetism, and electric field effects in bilayer graphene nanoribbons
Creators: name: Sahu, Bhagawan
name: Min, Hongki
name: MacDonald, Allan. H.
name: Banerjee, Sanjay K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using a first principles density functional electronic structure method, we study the energy gaps and magnetism in bilayer graphene nanoribbons as a function of the ribbon width and the strength of an external electric field between the layers. We assume AB (Bernal) stacking and consider both armchair and zigzag edges and two edge alignments distinguished by a 60$^o$ rotation of one layer with respect to the other. Armchair ribbons exhibit three classes of bilayer gaps which decrease with increasing ribbon width. An external electric field between the layers increases the gap in narrow ribbons and decreases the gap for wide ribbons, a property which can be understood semi-analytically using a $π$-band tight-binding model and perturbation theory. The magnetic properties of zigzag edge ribbons are different for the two different edge alignments, and not robust for all exchange-correlation approximations considered. Bilayer ribbon gaps are sensitive to the presence or absence of magnetism.
description: 8 pages, 8 figures (contents and figures changed)
Prescribed signal concentration on the boundary: Weak solvability in a chemotaxis-Stokes system with proliferation
Creators: name: Black, Tobias
name: Wu, Chunyan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35D30, 92C17, 35A01, 35K35, 35K55, 35Q35, 35Q92

description: We study a chemotaxis-Stokes system with signal consumption and logistic source terms of the form \noindent \begin{align*} \left\{ \begin{array}{r@{\ }l@{\quad}l@{\quad}l@{\,}c} n_{t}+u\cdot\!\nabla n&=Δn-\nabla\!\cdot(n\nabla c)+κn-μn^{2},\ &x\inΩ,& t>0,\\ c_{t}+u\cdot\!\nabla c&=Δc-nc,\ &x\inΩ,& t>0,\\ u_{t}&=Δu+\nabla P+n\nablaϕ,\ &x\inΩ,& t>0,\\ \nabla\cdot u&=0,\ &x\inΩ,& t>0,\\ \big(\nabla n-n\nabla c\big)\cdotν&=0,\quad c=c_{\star}(x),\quad u=0, &x\in\partialΩ,& t>0, \end{array}\right. \end{align*} where $κ\geq0$, $μ>0$ and, in contrast to the commonly investigated variants of chemotaxis-fluid systems, the signal concentration on the boundary of the domain $Ω\subset\mathbb{R}^N$ with $N\in\{2,3\}$, is a prescribed time-independent nonnegative function $c_{\star}\in C^{2}\!\big(\overlineΩ\big)$. Making use of the boundedness information entailed by the quadratic decay term of the first equation, we will show that the system above has at least one global weak solution for any suitably regular triplet of initial data.
description: 17 pages
Optically-induced frequency up-conversion of the ferromagnetic resonance in an ultrathin garnet
Creators: name: Soumah, Lucile
name: Bossini, Davide
name: Anane, Abdelmadjid
name: Bonetti, Stefano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material's bandgap, we trigger ultrafast optical and spin dynamics via both one- and two-photon absorption. Contrary to the common scenario, the optically-induced heating of the system induces an increase up to 20% of the ferromagnetic resonance frequency. We explain this unexpected result in terms of a photo-induced modification of the magnetic anisotropy, i.e. of the effective field, identifying the necessary conditions to observe this effect. Our results disclose the possibility to optically increase the magnetic eigenfrequency in nanometer-thick magnets.
description: 5 pages, 4 figures
STAGES OF DEVELOPMENT OF  THE INVESTIGATIVE SYSTEM OF INTERNAL AFFAIRS
Creators: name: Abdreimov, Azamat
Publisher: name: Zenodo
Year: 2024

description: This article discusses the creation of the investigation system of the internal affairs, how the investigation system was formed historically, who was entrusted with investigative activities in different periods, what was the legal basis of the investigative sphere during these periods, and what was the legal status of people who involved in investigative work, a number of suggestions and recommendations have been developed about the separation of the operational directions in the historical investigation and how to eliminate the obstacles and shortcomings related to this issue.
Epitaxial growth of rare-earth trifluorides on III-V semiconductors
Creators: name: Ritchie, Sayuri
Publisher: name: University of British Columbia
Year: 2009

description: Epitaxial growths of rare-earth trifluorides on III-V semiconductors have been investigated. Synchrotron photoemission spectroscopy showed a complete coverage of III-V substrates by LaF₃ and ErF₃ films and interfacial chemical reactions at the interface. In the LaF₃ films on GaAs(lll) substrates, residual tensile strains were detected by highresolution X-ray diffraction (HRXRD) contrary to the expected compressive strains in the case of a pseudomorphic growth. The tensile strains are interpreted as being due to the differential thermal contractions of the fluorides and the semiconductors during cooling. The correlations between the bulk structure and the surface structure of the LaF₃ films on GaAs and InP substrates have been studied by X-ray rocking curve measurements, grazing incidence X-ray scattering and atomic force microscopy. The lateral coherence lengths in the LaF₃ films from the X-ray rocking curves and the height-height surface correlation lengths from the X-ray scattering and the atomic force microscopy were comparable to each other and were associated with the lattice mismatch of the system at the growth temperature. The results are interpreted in terms of strain relieving defects surrounding the columns of coherent crystals. The kinetics of LaF₃ film growths on III-V semiconductors were investigated using the self-affine surface structure analysis for the X-ray specular/diffuse scattering and the atomic force microscopy. The scaling exponents for the film growth obtained from the analysis were closest to the exponents predicted by the Villain-Lai-Das Sarma model in which the surface diffusion of deposited particles is the most important process in the film growth. InP single crystal islands have been grown on LaF₃/InP(lll) heterostructures. The InP islands are observed to be faceted with three-fold symmetry as expected for (111) orientation. A small broadening of the InP substrate diffraction peak is interpreted as being due to inhomogeneous strains associated with the InP islands and differential thermal contraction of the LaF₃ films during cooling.
Ζητήματα γαιοκτησίας στην Ύστερη Οθωμανική αυτοκρατορία: Η περίπτωση της οικογένειας Βεζύρογλου
Creators: name: Ναθαναήλ, Γεώργιος Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Βεζύρογλου
Μαγνησία
ανταλλαγή περιουσιών
Vezyroglu
Magnisia
property exchange

description: Σκοπός της μεταπτυχιακής εργασίας είναι να αναδείξει πτυχές της οικονομικής ζωής της οικογένειας Βεζύρογλου με βάση το αρχείο της. Η οικογένεια κατοικούσε έως το 1922 στη Μαγνησία και τη Σμύρνη. Το 1914 η οικογένεια αντάλλαξε μέρος της περιουσίας της στη Μαγνησία με μέρος της περιουσίας του Μουσταφά Ραχμή στη περιοχή της Αλεξάνδρειας Ημαθίας. Αυτό αποτέλεσε το σημαντικότερο ζήτημα για την οικογένεια. Η συμφωνία επικυρώθηκε μετά από λίγες ημέρες με Βασιλικό Διάταγμα. Την εργασία απασχολούν επίσης ζητήματα που αντιμετώπισε η οικογένεια από το 1919 έως το 1922. Μερικά από αυτά ήταν η πώληση των μηχανημάτων του εργοστασίου, που διέθετε η οικογένεια, η αντιμετώπιση άλλων διεκδικητών της περιουσίας της οικογένειας στη Μακεδονία και η διαμάχη της με τους κολίγους. Εστιάζοντας στην περιουσία της οικογένειας στην Ελλάδα αυτή αποτελούνταν κυρίως από το αγρόκτημα Σχοινά, για το οποίο δίνονται πληροφορίες από τον 19ο αιώνα έως και το 1922.
description: The aim of the thesis is to highlight aspects of the economic life of the Vezyroglou family based on its archives. The family lived in Manisa and İzmir/Smyrna until 1922. In 1914 the family exchanged part of their property in Manisa for part of Mustafa Rahmi's property in the region of Alexandria, Imathia. This was the most important issue for the family. The agreement was ratified a few days later by Royal Decree. The paper also deals with issues that the family faced from 1919 to 1922. Some of these were the sale of the factory machinery owned by the family, dealing with other claimants to the family's property in Macedonia, and the family's dispute with the farmers. Focusing on the family's property in Greece, consisted mainly of the Schinas farm, for which information is given from the 19th century to 1922.
Τα κοινωνικά χριστιανοεβραϊκά σωματεία στη Θεσσαλονίκη την περίοδο 1920-1936: τα καταστατικά και η δράση τους
Creators: name: Ρούσσου, Κατερίνα Αδάμ
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Σωματείο, Ενωση, Σύνδεσμος
Χριστιανοί και Εβραίοι
Ψυχαγωγικοί σύλλογοι
Καταστατικό
Φιλανθρωπικοί σύλλογοι
Εθνικά σωματεία
Πολιτικά σωματεία
Συνοικισμός
Association
Christians and jews
Memorandum
Recreatioal associations
Philantropic associations
National associations
Political associations
Settlement

description: Στην παρούσα μελέτη επιχειρείται η εξέταση ορισμένων πτυχών της ιστορίας της Θεσσαλονίκης κατά την περίοδο του Μεσοπολέμου. Θέμα της είναι τα κοινωνικά σωματεία, στα οποία μετείχαν από κοινού χριστιανοί και Εβραίοι στη Θεσσαλονίκη από το 1920 ως το 1936. Βασική αρχειακή πηγή της εργασίας αποτέλεσαν τα καταστατικά των σωματείων του Πρωτοδικείου της πόλης. Συγκεκριμένα, διακρίνονται και μελετώνται οι διάφορες κατηγορίες των κοινωνικών χριστιανοεβραϊκών συλλόγων της Θεσσαλονίκης την περίοδο 1920-1936, καταγράφονται και αξιολογούνται τα κύρια χαρακτηριστικά αυτών των οργανώσεων και αναλύονται τα καταστατικά και η δράσης τους
description: In the present study is attempted the examinationa of certain aspects of Thessaloniki history during the Interwar period. Its subject is the social assiciations that were presented in Thessaloniki from 1920 until 1936, and in which christians and Jews were both participated. Basic archival source of the project constituted the associations's memorandums of the Court of First Instance of the city(Protodikio). Concretely, the various categories of social christian jewish associations of Thessaloniki are distinguisted and studied during the period 1920-1936, the main characteristics of these organisations are recorded and evaluated and the memorandums and their roles are also analyzed
Τροφικές συνήθειες του πετροκούναβου (Martes Foina) στο νομό Φθιώτιδας
Creators: name: Παπακώστα, Μαλαματή Αγαθάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Πετροκούναβο
Διατροφή
Φρούτα
Αρθρόποδα
Τροφικές συνήθειες
Diet
Fruits
Arthropods
Food habits
Martes foina

description: Η αρπακτικότητα του πετροκούναβου εκτιμήθηκε μέσω της ανάλυσης των τροφικών του συνηθειών στην Κεντρική Ελλάδα κατά τη διάρκεια 2003-2006. Εφαρμόστηκαν 4 τεχνικές για την ανάλυση του περιεχομένου 106 στομαχίων, τα οποία συλλέχθηκαν εποχιακά και σε 3 τύπους βιότοπων. Αναγνωρίστηκαν 689 άτομα λείας και ταξινομήθηκαν σε 27 είδη, 12 οικογένειες και μή αναγνωρισμένα πτηνά. Τα φρούτα ήταν η κυρίαρχη τροφική ομάδα το καλοκαίρι και το φθινόπωρο. Τα αρθρόποδα υπερίσχυσαν το χειμώνα και διαμόρφωσαν τον όγκο της τροφής. Την άνοιξη, τα θηλαστικά και τα ερπετά αποτελούσαν την σημαντικότερη ομάδα τροφής. Οι τροφικές συνήθειες διέφεραν μεταξύ των τριών τύπων βιότοπων, με τα φρούτα να υπερισχύουν. Συμπερασματικά, τα πετροκούναβο προσαρμόζει τις τροφικές του συνήθειες στα διαθέσιμα της τροφής στο χώρο και το χρόνο με μια τάση στην κατανάλωση φρούτων
description: The stone marten Martes Foina has been documented as an omnivorous feeder in its distribution range and the food availability affect its diet composition. The habit was studied through analysing the diet of the species in Central Greece, during 2003-2006. Four techniques were applied for analysing the contents of 106 stomachs, which collected according to the seasons in three habitat types. 689 prey items were recognised, including 27 species, 12 families and unidentified birds. Fruits were the most dominant prey category. Food habits showed a seasonal variation with fruits to predominate during the summer and autumn, Anthropods also showed a seasonal variation but they formed the bulk of diet during the winter. In spring, mammals and reptiles represented the most important food category. Diet varied among the 3 habitat types, fruits to predominate. It is concluded that store marten showed adaptability on food resources in space and time
The Ophiuchus Superbubble: A Gigantic Eruption from the Inner Disk of the Milky Way
Creators: name: Pidopryhora, Yurii
name: Lockman, Felix J.
name: Shields, Joseph C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: While studying extraplanar neutral hydrogen in the disk-halo transition of the inner Galaxy we have discovered what appears to be a huge superbubble centered around l ~ 30 deg, whose top extends to latitudes > 25 deg at a distance of about 7 kpc. It is detected in both HI and Halpha. Using the Green Bank Telescope of the NRAO, we have measured more than 220,000 HI spectra at 9' angular resolution in and around this structure. The total HI mass in the system is ~ 10^6 Msol and it has an equal mass in H+. The Plume of HI capping its top is 1.2 x 0.6 kpc in l and b and contains 3 x 10^4 Msol of HI. Despite its location, (the main section is 3.4 kpc above the Galactic plane) the kinematics of the Plume appears to be dominated by Galactic rotation, but with a lag of 27 km/s from corotation. At the base of this structure there are ``whiskers'' of HI several hundreds of pc wide, reaching more than 1 kpc into the halo; they have a vertical density structure suggesting that they are the bubble walls and have been created by sideways rather than upwards motion. They resemble the vertical dust lanes seen in NGC891. From a Kompaneets model of an expanding bubble, we estimate that the age of this system is ~ 30 Myr and its total energy content ~ 10^53 ergs. It may just now be at the stage where its expansion has ceased and the shell is beginning to undergo significant instabilities. This system offers an unprecedented opportunity to study a number of important phenomena at close range, including superbubble evolution, turbulence in an HI shell, and the magnitude of the ionizing flux above the Galactic disk.
description: 44 pages, 14 figures, accepted for publication in the Astrophysical Journal
An analysis method for data taken by Imaging Air Cherenkov Telescopes at very high energies under the presence of clouds
Creators: name: Sobczyńska, Dorota
name: Adamczyk, Katarzyna
name: Sitarek, Julian
name: Szanecki, Michal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The effective observation time of Imaging Air Cherenkov Telescopes (IACTs) plays an important role in the detection of gamma-ray sources, especially when the expected flux is low. This time is strongly limited by the atmospheric conditions. Significant extinction of Cherenkov light caused by the presence of clouds reduces the photon detection rate and also complicates or even makes impossible proper data analysis. However, for clouds with relatively high atmospheric transmission, high energy showers can still produce enough Cherenkov photons to allow their detection by IACTs. In this paper, we study the degradation of the detection capability of an array of small-sized telescopes for different cloud transmissions. We show the expected changes of the energy bias, energy and angular resolution and the effective collection area caused by absorption layers located at 2.5 and 4.5 km above the observation level. We demonstrate simple correction methods for reconstructed energy and effective collection area. As a result, the source flux that is observed during the presence of clouds is determined with a systematic error of < 20%. Finally, we show that the proposed correction method can be used for clouds at altitudes higher than 5 km a.s.l.. As a result, the analysis of data taken under certain cloudy conditions will not require additional time-consuming Monte Carlo simulations.
description: 10 pages, 9 figures
The $ε'/ε$-Story: 1976-2021
Creators: name: Buras, Andrzej J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The ratio $ε'/ε$ measures the size of the direct CP violation in $K_L\toππ$ decays $(ε^\prime)$ relative to the indirect one described by $ε$ and is very sensitive to new sources of CP violation. As such it played a prominent role in particle physics already for 45 years. Due to the smallness of $ε'/ε$ its measurement required heroic efforts in the 1980s and the 1990s on both sides of the Atlantic with final results presented by NA48 and KTeV collaborations 20 years ago. Unfortunately, even 45 years after the first calculation of $ε'/ε$ we do not know to which degree the Standard Model agrees with this data and how large is the room left for new physics contributions to this ratio. This is due to significant non-perturbative (hadronic) uncertainties accompanied by partial cancellation between the QCD penguin contributions and electroweak penguin contributions. While the significant control over the short distance perturbative effects has been achieved already in the early 1990s, with several improvements since then, different views on the non-perturbative contributions to $ε'/ε$ have been expressed by different authors over last thirty years. In fact even today the uncertainty in the room left for NP contributions to $ε'/ε$ is very significant. My own work on $ε'/ε$ started in 1983 and involved both perturbative and non-perturbative calculations. This writing is a non-technical recollection of the steps which led to the present status of $ε'/ε$ including several historical remarks not known to everybody. The present status of the $ΔI=1/2$ rule is also summarized. This story is dedicated to Jean-Marc Gerard on the occasion of the 35th anniversary of our collaboration and his 64th birthday.
description: 31 pages, in V2 misprints in the text removed, footnote 9 improved. Matches published version
Pseudo-Waveform-Selective Metasurfaces and Their Limited Performance
Creators: name: Nakasha, Tomoyuki
name: Phang, Sendy
name: Wakatsuchi, Hiroki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In recent years, metasurfaces composed of lumped circuit components, including nonlinear Schottky diodes, have been reported to be capable of sensing particular electromagnetic waves even at the same frequency depending on their waveforms, or more specifically, their pulse widths. In this study, we report analogous waveform-selective phenomena using only linear circuits and linear media. Although such linear metasurfaces are analytically and numerically demonstrated to exhibit variable absorption performance, it cannot strictly be categorized as waveform-selective absorption. It is due to the fact that the waveform-selective responses in the linear metasurfaces are originated from the dispersion behaviors of the structures rather than the frequency-conversion seen in nonlinear waveform-selective metasurfaces. We thus refer to these linear structures as pseudo-waveform-selective metasurfaces. Additionally, we show that the pseudo-waveform-selective metasurfaces have limited performance unless nonlinearity is introduced. These results and findings confirm the advantages of nonlinear waveform-selective metasurfaces, which can be exploited to provide an additional degree of freedom to address existing electromagnetic problems/challenges involving even waves at the same frequency.
description: 10 pages, 4 figures
Gestão de Dados de Investigação e Princípios FAIR: Sessão Informativa
Creators: name: Almeida, Bruno
Publisher: name: Zenodo
Year: 2024
Subjects: research data management
FAIR principles

description: Apresentação sobre gestão de dados de investigação e princípios FAIR realizada no âmbito da 5ª Edição do Mês da Ciência Aberta na NOVA FCSH, em 9 de outubro de 2024.
ALCUNE CONSIDERAZIONI SULLE PERTURBAZIONI ELETTRICHE NELLA GAP DI UN SINCROTRONE CAUSATE DALLA DIFFERENZA DI POTENZIALE TRA  IL MAGNETE E GLI AVVOLGIMENTI
Creators: name: G.SACERDOTI
Publisher: name: INFN Open Access Repository
Year: 1953

description: Tra i conduttori di un avvolgimento di eccitazione e la massa magnetica di un sincrotrone si stabiliscono, durante il funzionamento della macchina, delle differenze di potenziale che provocano, se non si interviene con schermi, campi elettrici anche entro la gap, nella zona dove si muovono gli elettroni. Sottolineiamo che questi campi elettrici perturbatori sono massimi, quando le differenze di potenziale tra le varie parti della macchina sono massime, e, date le caratteristiche dell'eccitazione, quando e' manima la corrente di eccitazione. Questo fatto rende piu' urgente la necessita' di evitare in qualche modo queste perturbazioni, in quanto si fanno sentire maggiormente durante l'iniezione, che noi sappiamo essere il momento piu' critico e pericoloso per la focalizzazione degli elettroni.
title: Impact of particle size and morphology of cobalt oxide on thermal response to methane examined by thermal analysis
title: Supplementary data
titleType: AlternativeTitle
Creators: name: Yurchenko, Olena
name: Engel, Laura
name: Pernau, Hans-Fridtjof
Publisher: name: Fraunhofer-Gesellschaft
Year: 2021
Subjects: subject: metal oxide catalysts
subject: catalytic gas sensor
subject: Differential Thermal Analysis (DTA)
subject: particle size
subject: morphology
subject: DDC::600 Technik, Medizin, angewandte Wissenschaften::600 Technik::600 Technik, Technologie

description: Measurement results of particle size analysis of investigated cobalt oxide catalyst. Differential thermal analysis investigation results of thermal response of catalyst towards methane and respective mass spectroscopy investigation.
Δύο λεπροί άγιοι. Η περίπτωση του Νικηφόρου και Ευμενίου, στο Νοσοκομείο Λοιμωδών, Αγ. Βαρβάρας Αττικής, σε μια πορεία αγιοσύνης, προσφοράς, μάρκετινγκ και προσκυνήματος
Creators: name: Μουρατίδου, Φωτεινή Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Λοιμωδών Νοσοκομείο
Όσιος Ευμένιος Σαριδάκης
Όσιος Νικηφόρος, ο λεπρός
Infectious Diseases Hospital (Loimodon Hospital)
Saint Eumenios Saridakis
Saint Nikiforos, the leper

description: Στην παρούσα διπλωματική εργασία αναφέρεται η ιστορία και η προσκυνηματική αξία του Ιερού Παρεκκλησίου Αγίων Αναργύρων στο Νοσοκομείο Λοιμωδών Νόσων στην Αγία Βαρβάρα Δυτικής Αττικής. Προβάλλεται και προωθείται ο ιερός νοσοκομειακός ναός καθώς επίσης, ο βίος και το έργο των δύο καινοφανών οσίων Νικηφόρου του λεπρού και Ευμενίου Σαριδάκη. Γίνεται η ανάδειξή τους σε τουριστικό προϊόν και αναφέρονται οι δυνατότητες προβολής τους μέσω εναλλακτικών μορφών τουρισμού. Προτείνεται η δυναμική του προσκυνήματος στην τοπική ανάπτυξη. Αναφέρονται οι δυνατότητες ανάπτυξης του θρησκευτικού τουρισμού στην Ιερά Μητρόπολη Νικαίας και στην ευρύτερη περιοχή -σε συνδυασμό και με άλλα θρησκευτικά και πολιτισμικά μνημεία- με προτάσεις προβολής, προώθησης και αξιοποίησης του βασικού προσκυνήματος, αλλά και με μία εκτενή πρόταση προσκυνηματικής πορείας - οδοιπορικού στην Αττική. Τέλος, κατατίθεται και η πρόταση δημιουργίας ιστοσελίδας του νοσοκομειακού παρεκκλησίου.
description: Ιn this thesis, the history and the pilgrimage value of the Holy Chapel of Agioi Anargyroi in the Hospital of Infectious Diseases, in Agia Varvara, Western Attica, are mentioned. The holy hospital church is shown and promoted as well as the life and work of the two innovative saints Nicephoros, the leper and Eumenios Saridakis. They are highlighted as a tourist product and the possibilities of their promotion through alternative forms of tourism are introduced. Additionally, the potential of this pilgrimage in local development is proposed. The possibilities for the development of religious tourism in the Holy Metropolis of Nicaea and in the wider area are referenced -in combination with other religious and cultural monuments-with proposals for projection, promotion and utilization of the basic pilgrimage, but also with an extensive proposal for a pilgrimage route - trekking in Attica. Finally, the proposition to create a website for the hospital chapel is submitted.
description: Σε συνεργασία με: Τμήμα Διοίκησης οργανισμών, Μάρκετινγκ και Τουρισμού της Σχολής Οικονομίας και Διοίκησης (Θεσσαλονίκης) του Διεθνούς Πανεπιστημίου Ελλάδας
Lagrangian particle model for 3D simulation of pellets and SPI fragments in tokamaks
Creators: name: Samulyak, R.
name: Yuan, S.
name: Naitlho, N.
name: Parks, P. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A 3D numerical model for the ablation of pellets and shattered pellet injection (SPI) fragments in tokamaks in the plasma disruption mitigation and fueling parameter space has been developed based on the Lagrangian particle code [R. Samulyak, X. Wang, H.-S. Chen, Lagrangian Particle Method for Compressible Fluid Dynamics, J. Comput. Phys., 362 (2018), 1-19]. The pellet code implements the low magnetic Reynolds number MHD equations, kinetic models for the electronic heating, a pellet surface ablation model, an equation of state that supports multiple ionization states, radiation, and a model for grad-B drift of the ablated material across the magnetic field. The Lagrangian particle algorithm is highly adaptive, capable of simulating a large number of fragments in 3D while eliminating numerical difficulties of dealing with the tokamak background plasma. The code has achieved good agreement with theory for spherically symmetric ablation flows. Axisymmetric simulations of neon and deuterium pellets in magnetic fields ranging from 1 to 6 Tesla have been compared with previous simulations using the FronTier code, and very good agreement has also been obtained. The main physics contribution of the paper is a detailed study of the influence of 3D effects, in particular grad-B drift, on pellet ablation rates and properties of ablation clouds. Smaller reductions of ablation rates in magnetic fields compared to axially symmetric simulations have been demonstrated because the ablated material is not confined to narrowing channels in the presence of grad-B drift. Contribution of various factors in the grad-B drift model has also been quantified.
description: 30 pages, 12 figures, 5 tables
Ευασθητοποίηση εκπαιδευτικών σε θέματα φύλου. Διακηρύξεις διεθνών οργανισμών (ΟΗΕ-Ουνέσκο) και η ευρωπαϊκή πολιτική. Αρχές, στόχοι, πρακτικές
Creators: name: Χουρσούτογλου, Βασίλης Ευγένιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Ανισότητα μεταξύ των φύλων
Ο ρόλος του ΟΗΕ και της ΕΕ στην εδραίωση της ισότητας των φύλων
Δεκαετία 1960. Ο ρόλος των εκπαιδευτικών στην αντιμετώπιση σεξιστικών στερεοτύπων
Δεκαετία 1970. Τονίζεται η ανάγκη επιμόρφωσής τους
Δεκαετία 1980. Χρησιμοποιείται στα κείμενα του ΟΗΕ ο όρος gender mainstreaming
Δεκαετία 1990. Υλοποίηση προγραμμάτων ευαισθητοποίησης εκπαιδευτικών σε θέματα φύλου
Education
Teacher
Gender
Sensitization
UN
Gender mainstreaming

description: Ο ρόλος του σχολείου είναι εξαιρετικά σημαντικός στην πορεία της αλλαγής των στερεότυπων αντιλήψεων των νέων για το φύλο.Μέσα σε αυτό ο εκπαιδευτικός μπορεί να συνεισφέρει τις μεγαλύτερες υπηρεσίες, αρκεί να είναι επιστημονικά καταρτισμένος. Στόχοι της εργασίας αυτής είναι : Να γίνει μια ιστορική αναδρομή της θέσης της γυναίκας στην εκπαίδευση. Να καταγραφούν οι φιλοσοφικές και παιδαγωγικές επιρροές στην εξέλιξη της γυναίκας ως υποκειμένου της εκπαιδευτικής διαδικασίας. Να σταχυολογηθούν τα κείμενα του ΟΗΕ και της ΕΕ που στοχεύουν στην ευαισθητοποίηση και επιμόρφωση των εκπαιδευτικών σε θέματα φύλου. Να παρουσιαστούν τα προγράμματα επιμόρφωσης εκπαιδευτικών σε θέματα φύλου που υλοποιήθηκαν στην Ευρώπη και την πατρίδα μας. Να αξιολογηθούν οι θετικές δράσεις που πραγματοποιήθηκαν. Να κατατεθούν προτάσεις ουσιαστικής επιμόρφωσης των εκπαιδευτικών σε θέματα φύλου
description: The roles of the school is extremely significant in the course of altering the stereotypic beliefs of the young about the sex. In this, the teacher can contribute the biggest services, on if they are appropriately educated. The goals, of this project are : Completing a historical trespection of the woman's place in the educational system. All the philosophical and pedagogical influences in the evolution of the woman as a subject of the educational procedure be recorded. Gathering all the texts of the U.N. and the E. U. that focus on the sensitization and education of the educators on sex issues. Presenting all the educational programmes about teachers on sex issues that were completed in Europe and in our country. Evaluating the positive actions that were made. Presenting the recommendations of serious teaching of the teachers on sex issues
Variation of fundamental constants in space and time: theory and observations
Creators: name: Flambaum, V. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Review of recent works devoted to the temporal and spatial variation of the fundamental constants and dependence of the fundamental constants on the gravitational potential (violation of local position invariance) is presented. We discuss the variation of the fine structure constant $α=e^2/\hbar c$, strong interaction and fundamental masses (Higgs vacuum), e.g. the electron-to-proton mass ratio $μ=m_e/M_p$ or $X_e=m_e/Λ_{QCD}$ and $X_q=m_q/Λ_{QCD}$. We also present new results from Big Bang nucleosynthesis and Oklo natural nuclear reactor data and propose new measurements of enhanced effects in atoms, nuclei and molecules, both in quasar and laboratory spectra.
description: Proceeding of ACFC, BadHonnef, 2007: to be published in EPJ
On the Density of Spoof Odd Perfect Numbers
Creators: name: Tóth, László
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 11A51, Secondary 11N25, 11B83

description: We study the set $\mathcal{S}$ of odd positive integers $n$ with the property ${2n}/{σ(n)} - 1 = 1/x$, for positive integer $x$, i.e., the set that relates to odd perfect and odd "spoof perfect" numbers. As a consequence, we find that if $D=pq$ denotes a spoof odd perfect number other than Descartes' example, with pseudo-prime factor $p$, then $q>10^{12}$. Furthermore, we find irregularities in the ending digits of integers $n\in\mathcal{S}$ and study aspects of its density, leading us to conjecture that the amount of numbers in $\mathcal{S}$ below $k$ is $\sim10 \log(k)$.
description: Added a note excluding Descartes' example from the Theorem
Dense, strongly coupled plasmas in femtosecond laser-matter interactions
Creators: name: Forsman, Andrew
Publisher: name: University of British Columbia
Year: 2009

description: The development of laser systems capable of delivering laser pulses lasting merely hundreds of femtoseconds, yet having peak intensities exceeding 10[superscript 15]W/cm², has opened new avenues for laboratory studies of the equation of state and transport properties of hot, dense, plasmas in the strongly coupled regime. As the new experiments began to yield data, there arose a need for new methods to interpret their results and to design new experiments. This thesis addresses such needs through numerical modelling of femtosecond laser-matter interactions. Moreover, this thesis shows how numerical modelling is not only indispensable for modelling most femtosecond laser-matter experiments but also a guide to bring greater depth and breadth to our understanding of femtosecond laser-matter interactions. Finally, as the continued development of laser technology may reduce the durations of intense laser pulses to tens of femtoseconds, a new class of experiments offering the possibility of measuring the transport and equation of state properties of extremely well-defined, solid-density, strongly coupled plasmas can be realized.
Νεοελληνικός διαφωτισμός-οι ιδεολογικές τάσεις και τα ρεύματα της σκέψης
Creators: name: Παπαϊωάννου, Σωτήριος Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Θεία σοφία
Κοσμική φιλοσοφία
Θεία Αποκάλυψη
Ελεύθερη σκέψη
Μεταφυσικός προβληματισμός
Κοινωνική ηθική
Holly wisdom
Cosmic philosophy
Holly apocalypse
Free thinking
Metaphysical speculations
Social morality

description: Ο νεοελληνικός διαφωτισμός δεν εξαντλείται σε ορισμένες φιλοσοφικές αντιλήψεις, καθόσον δεν υιοθέτησε μια ενιαία φιλοσοφοική τοποθέτηση και δεν δημιούργησε πρωτότυπες φιλοσοφικές ιδέες. Μπορεί να νοηθεί πληρέστερα με την αντιπαραβολή του με τα αντίστοιχα ρεύματα της σκέψης του ευρωπαϊκού διαφωτισμού, των οποίων ο ίδιος είναι αντανάκλαση. Αναπτύχθηκε μέσα στο κλίμα της πνευματικής παντοδυναμίας της εκκλησίας. Η παρούσα μελέτη προσπαθεί να καταδείξει ποιες μορφές έλαβε ο νεολληνικός διαφωτισμός, ποιες φιλοσοφικές τάσεις και ποια ρεύματα σκέψης διαμόρφωσε αλλά και σε τι εμπόδια πρόσκοψε η προσπάθεια αυτή
description: Modern greek enlightenment cannot be exhausted in certain philosophical perceptions, as it did not adopt a unified philosophical palecement and did not create original philosophical ideas.It can be more thoroughly comprehended within its own comparison with the equivalent thoughts of european enlightenment, from which it is a reflection of.I was developed through the conditions of the Church's intellectual domination. The present study attempts to show which forms the Modern Greek enlightenment took, which philosophical tendencies and what intellectual thoughts shaped, but also with which obstacles this effort came accross
The Dependence of Galaxy Morphology and Structure on Environment and Stellar Mass
Creators: name: van der Wel, Arjen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: From the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5), we extract a sample of 4594 galaxies at redshifts 0.02
description: Accepted for publication in ApJ Letters, 5 pages, 5 figures. Minor changes made to match published version
Entropy of Thermal CFTs on Curved Backgrounds
Creators: name: Giataganas, Dimitrios
name: Tetradis, Nikolaos
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use holography in order to study the entropy of thermal CFTs on (1+1)-dimensional curved backgrounds that contain horizons. Starting from the metric of the BTZ black hole, we perform explicit coordinate transformations that set the boundary metric in de Sitter or black-hole form. For a de Sitter boundary, the dual picture describes a CFT at a temperature different from that of the cosmological horizon. We determine minimal surfaces that allow us to compute the entanglement entropy of a boundary region, as well as the temperature affecting the energy associated with a probe quark on the boundary. For an entangling surface that coincides with the horizon, we study the relation between entanglement and gravitational entropy through an appropriate definition of the effective Newton's constant. We find that the leading contribution to the entropy is proportional to the horizon area, with a coefficient that accounts for the degrees of freedom of a CFT thermalized above the horizon temperature. We demonstrate the universality of our findings by considering the most general metric in a (2+1)-dimensional AdS bulk containing a non-rotating black hole and a static boundary with horizons.
description: 17 pages, 3 Figures
Versöhnung als ökumenischer Leitbegriff in einem veränderten Europa
Creators: name: Noll, Rüdiger
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 46 Nr. 4 (1997): Ökumenische Rundschau, Band 46, Heft 4
Thermophysical model for icy cometary dust particles
Creators: name: Markkanen, Johannes
name: Agarwal, Jessica
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Context. Cometary dust particles are subjected to various forces after being lifted off the nucleus. These forces define the dynamics of dust, trajectories, alignment, and fragmentation, which, in turn, have a significant effect on the particle distribution in the coma. Aims. We develop a numerical thermophysical model that is applicable to icy cometary dust to study the forces attributed to the sublimation of ice. Methods. We extended the recently introduced synoptic model for ice-free dust particles to ice-containing dust. We introduced an additional source term to the energy balance equation accounting for the heat of sublimation and condensation. We use the direct simulation Monte Carlo approach with the dusty gas model to solve the mass balance equation and the energy balance equation simultaneously. Results. The numerical tests show that the proposed method can be applied for dust particles covering the size range from tens of microns to centimeters with a moderate computational cost. We predict that for an assumed ice volume fraction of 0.05, particles with a radius, r >> 1 mm, at 1.35 AU, may disintegrate into mm-sized fragments due to internal pressure build-up. Particles with r < 1 cm lose their ice content within minutes. Hence, we expect that only particles with r > 1cm may demonstrate sustained sublimation and the resulting outgassing forces.
Supplemental A and B: Automated shear zone thickness calculation methods, and variation in fallow tests from Modelling of stress transfer in root-reinforced soils informed by
Creators: name: Bull, D. J.
name: Smethurst, J. A.
name: Meijer, G. J.
name: Sinclair, I.
name: Pierron, F.
name: Roose, T.
name: Powrie, W.
name: Bengough, A. G.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 90599 Civil Engineering not elsewhere classified
subject: FOS: Civil engineering
subject: 90799 Environmental Engineering not elsewhere classified
subject: FOS: Environmental engineering

description: Explanations of and results from different automated shear zone thickness calculation methods, and a brief investigation of the differences in the measured shearing resistance in the Fallow specimens.
Can Copper Nanostructures Sustain High-Quality Plasmons?
Creators: name: Mkhitaryan, Vahagn
name: March, Katia
name: Tseng, Eric
name: Li, Xiaoyan
name: Scarabelli, Leonardo
name: Liz-Marzán, Luis M.
name: Chen, Shih-Yun
name: Tizei, Luiz H. G.
name: Stéphan, Odile
name: Song, Jenn-Ming
name: Kociak, Mathieu
name: de Abajo, F. Javier García
name: Gloter, Alexandre
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Silver is considered to be the king among plasmonic materials because it features low inelastic absorption in the visible and infrared (vis-IR) spectral regions compared to other metals. In contrast, copper is commonly regarded as being too lossy for plasmonic applications. Here, we experimentally demonstrate vis-IR plasmons in long copper nanowires (NWs) with quality factors that exceed a value of 60, as determined by spatially resolved, high-resolution electron energy-loss spectroscopy (EELS) measurements. We explain this counterintuitive result by the fact that plasmons in these metal wires have most of their electromagnetic energy outside the metal, and thus, they are less sensitive to inelastic losses in the material. We present an extensive set of data acquired on long silver and copper NWs of varying diameters supporting this conclusion and further allowing us to understand the relative roles played by radiative and nonradiative losses in plasmons that span a wide range of energies down to $<20\,$meV. At such small plasmon energies, thermal population of these modes becomes significant enough to enable the observation of electron energy gains associated with plasmon absorption events. Our results support the use of copper as an attractive cheap and abundant material platform for high quality plasmons in elongated nanostructures.
description: 13 pages, 9 figures, 56 references