cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Metasurfaces for the Infrared Spectral Range Fabricated Using Two-Photon Polymerization
Creators: name: McLamb, Michael
name: Li, Yanzeng
name: Stinson, Paige
name: Hofmann, Tino
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Fabrication of metasurfaces is ofthen time consuming and expensive, involving complex lithographic processes. The maskless fabrication of metasurfaces composed of rectangular Au bars is reported as a suitable alternative, providing cost-effective, rapid prototyping of metasurfaces. The investigated metasurfaces were fabricated using a simple three-step process which is discussed in detail. The fabrication process establishes a simple method for producing high fidelity 2D patterns suitable to synthesize metasurfaces for chemical sensing, beam steering, and perfect reflection/transmission. Comprehensive polarization-sensitive reflection data reveal multiple resonances in the infrared spectral range. In addition to the dipole and substrate resonances, a resonance which is attributed to a coupling between the excitation of the metasurface and the substrate phonon mode is observed.
title: Robust Shape Optimization of Electromechanical Energy Converters
Creators: name: Polenz, Björn
Publisher: name: UNSPECIFIED
Year: 2024

description: This work deals with the simulation and shape optimization of electromechanical energy converters under uncertainty. More precisely, an asynchronous machine is considered, whose electromagnetic fields can be described by the magnetoquasistatic approximation of Maxwell’s equations, which are coupled with network equations for the rotor cage and for the exciting three-phase current. The state system is completed by an equation of motion which is excited by the torque. This leads to a system of partial differential algebraic equations. A finite element approach with a time-stepping method is used to solve the equation numerically. We consider uncertainties in the material and geometry of the machine and use a worst-case approach to address these uncertainties. This leads to a bi-level structured optimization problem. Since these problems are difficult to solve numerically, we use approximations up to second order as surrogate models. In particular, we use Taylor models in combination with an adaptive strategy to improve the approximation quality and derivative-free interpolation models that can also be improved iteratively. Both the problem formulation and the consideration of uncertainty in the optimization lead to a high computational cost. To speed up our computations, we apply model dimension reduction techniques.
Initial Reports of the Deep Sea Drilling Project - Volume 81
Creators: name: Roberts, D.G.
name: Schnitker, D.
name: The Leg 81 Science Party
Publisher: name: U.S. Government Printing Office
Year: 1984
Subjects: Deep Sea Drilling Project
Glomar Challenger
DSDP
Leg 81
Site 552
Site 553
Site 554
Site 555
Northeastern Atlantic Ocean
Rockall Plateau

description: This volume covers Leg 81 of the cruises of the Drilling Vessel Glomar Challenger. During the first International Phase of Ocean Drilling (IPOD) of the Deep Sea Drilling Project (DSDP), several passive margins were drilled in the Atlantic Ocean and the Gulf of California by means of a series of transects designed to address the evolution of passive margins in part as a function of relative age. During Leg 81, a systematic transect of five holes across the entire west margin of Rockall Plateau was designed by the Passive Margin Panel with the specific objectives of documenting the nature of the dipping reflectors and the evolution of the margin in time and space. Leg 81 of the IPOD Phase II of the Deep Sea Drilling Project began in Southampton on 27 July 1981 and ended 56 days later in Ponta Delgada, San Miguel, Azores. During the leg, Glomar Challenger drilled eight holes at four sites.
Space Charge Aberrations in Single Shot Time-Resolved Transmission Electron Microscopy
Creators: name: Denham, Paul
name: Musumeci, Pietro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this paper, we discuss effects of space charge fields on imaging performance in a single shot time-resolved electron microscope (TEM). Using a Green's function perturbation method, we derive analytical estimates for the effects of space charge nonlinearity on the image formation process and the associated aberration coefficients. The dependence of these coefficients on the initial beam phase space distribution is elucidated. The results are validated by particle tracking simulations and provide fundamental scaling laws for the trade-off between temporal and spatial resolution in single-shot time-resolved TEM.
description: 13 pages, 9 figures
Οδοντογενείς κερατινοκυστικοί όγκοι: παθογένεια, κλινική - ιστοπαθολογική εικόνα, θεραπευτική προσέγγιση
Creators: name: Ναζάρογλου, Ιωάννης Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Κερατινοκύστεις
Οδοντογενείς Κερατινοκυστικοί Όγκοι
Εκπυρήνιση
Μαρσιποποίηση
Εκτομή
Keratocysts
Odontogenic Keratocystic Tumors
Enucleation
Marsipulisation
Dissection

description: Οι οδοντογενείς κερατινοκύστεις, αποτελούν το 2-11% του συνόλου των κύστεων των γνάθων 6 και είναι μία από τις πιο αμφιλεγόμενες και πολυμελετημένες βλάβες που εμφανίζονται στην στοματική κοιλότητα. Το 2005, ο Παγκόσμιος Οργανισμός Υγείας, στην πιο πρόσφατη κατηγοριοποίηση των Όγκων Κεφαλής και Τραχήλου, επαναπροσδιόρισε την φύση της οδοντογενούς κερατινοκύστης και την συμπεριέλαβε στους όγκους, με την επωνυμία Οδοντογενής Κερατινοκυστικός Όγκος (Ο.Κ.Ο.). Η μετονομασία της Οδοντογενούς Κερατινοκύστης σε Ο.Κ.Ο., οφείλεται στα πρόσφατα ερευνητικά και κλινικά δεδομένα που αφορούν την βιολογία, την ιστολογία και την κλινική συμπεριφορά της βλάβης, τα οποία υποδεικνύουν ιδιαίτερη επιθετικότητα, με καταστροφική επέκταση στο οστό των γνάθων, υποτροπή μετά από χειρουργική θεραπεία και σπάνια αλλά τεκμηριωμένη κακοήθη εξαλλαγή σε ακανθοκυτταρικό καρκίνωμα. Το σημαντικότερο όμως εύρημα είναι η συσχέτιση του Ο.Κ.Ο. με μεταλλάξεις σε ογκοκατασταλτικά γονίδια, οι οποίες πυροδοτούν κωδικοποίηση μορίων απαραίτητων στα διάφορα «μονοπάτια του καρκίνου». Τα σύγχρονα αυτά στοιχεία, αναλύονται στην παρούσα βιβλιογραφική ανασκόπηση, η οποία περιγράφει τους μονήρεις (μεμονομένους) Ο.Κ.Ο. των γνάθων. Ακόμη, αναλύεται η θεραπευτική προσέγγιση των Ο.Κ.Ο., η υποτροπή τους, η κακοήθης εξαλλαγή τους και οι εξελίξεις επάνω στον τομέα της μοριακής θεραπείας τους.
description: The keratocystic odontogenic tumours (KCOTs) account for between about 2% – 11% of all jaw cysts and they are of the most controversial entities of the maxillofacial region. The KCOT was classified as a benign odontogenic tumour by the World Health Organization in 2005. KCOTs are benign but locally aggressive and the show a very high incidence of recurrence after initial surgical treatment, if not adequately removed. In addition to this, they show a small but evidenced incidence of transformation into squamous cell carcinoma. Molecular studies have demonstrated evidence of allelic loss of several tumour suppressor genes in patients with KCOTs. All these theories are analysed in the present review of the literature. Additionally, classic surgical treatment approach as well as molecular and biological therapy of KCOTs are described.
Resistance Anomaly in Disordered Superconducting Films
Creators: name: Hua, J.
name: Xiao, Z. L.
name: Rosenmann, D.
name: Beloborodov, I. S.
name: Welp, U.
name: Kwok, W. K.
name: Crabtree, G. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on a resistance anomaly in disordered superconducting films containing arrays of irregularly distributed nanoscale holes. At high driving currents, peaks appear in the resistance as a function of temperature, with peak values up to 2% above the classic normal-state resistance. We attribute the observed resistance anomaly to dissipation-induced granularity which enhances the contributions from fluctuation-induced reduction of the density of states of the quasiparticles. The granular feature of a disordered superconducting film originates from the inhomogeneous temperature distribution caused by the variation of the local dissipation and/or heat transfer.
description: 14 pages, 3 figures, accepted for publication in Applied Physics Letters
Η εξέλιξη των εισοδημάτων μεταξύ ανδρών και γυναικών μεταπολεμικά στην Ελλάδα:
Creators: name: Σπάσου, Μαρία Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: ‘Pareto’ κατανομή
Εισοδηματικά μερίδια
Ελλάδα
Pareto distribution
Top income shares
Greece

description: Αντικείμενο της εργασίας αυτής είναι η ανακατασκευή της εισοδηματικής κατανομής από τα ομαδοποιημένα δεδομένα που προκύπτουν από τις δηλώσεις της φορολογίας φυσικών προσώπων με σκοπό την εμπειρική διερεύνηση της κατανομής των εισοδημάτων στην Ελλάδα κατά την περίοδο 1961-2002. Λόγω της έντονης ασυμμετρίας (λοξότητα) της συνάρτησης συχνότητας των εισοδημάτων, υιοθετείται η κατανομή Pareto η οποία περιγράφει πιο ικανοποιητικά τη συμπεριφορά των ακραίων εισοδημάτων. Με βάση τη κατανομή Pareto, εκτιμώνται η εισοδηματική ανισότητα χωριστά για τα δύο φύλα και τα ποσά των εισοδημάτων εκφρασμένα ως ποσοστά στο σύνολο του συνολικού εισοδήματος που κατέχουν τα άτομα στο ανώτερο τμήμα της κατανομής. Σημαντική πτώση των μεριδίων αυτών πραγματοποιείται από το 1965 μέχρι και το 1985 για τους άνδρες και μόνο τη δεκαετία του ‘80 για τις γυναίκες. Από τις αρχές της δεκαετίας του ‘90 τα μερίδια που αντιστοιχούν στα ανώτερα ποσοστά καταφέρνουν και ανέρχονται και για τα δύο φύλα. Η εξέλιξη της εισοδηματικής ανισότητας και για τα δύο φύλα δε μπορεί να ερμηνευτεί μόνο από τη διαδικασία της ανάπτυξης στην Ελλάδα, το ισχύον φορολογικό σύστημα, η ύπαρξη δυσκαμψιών και κοινωνικών προκαταλήψεων στην αγορά εργασίας δίνουν τελικά τις κατευθυντήριες γραμμές στην εξέλιξη της εισοδηματικής ανισότητας.
description: The purpose of this work is to reconstruct the income distribution using grouped tax returns data published annually in Statistics of Income: Individual Income Tax Returns in order to examine empirically the distribution of incomes in Greece for the period 1961- 2002. Due to the strong asymmetry (skewness) of the frequency distribution of income, it is assumed that the Pareto distribution describes better the allocation of top income among individuals than any other distribution. The Pareto interpolation technique then used to estimate the income inequality separately for both sexes and the amounts of income held by people in the upper tail of the distribution expressed as percentages of the entire total income. Significant drop in top income shares is carried out from 1965 until 1985 for men and only the ‘80s for women. Since the early ‘90s the top income shares followed a slightly upward trend for both men and women. The income inequality for both sexes in Greece can not be interpreted only by the process of development in Greece, the current tax system, the existence of prejudice and social rigidities in the labor market are some factors that contribute to the explanation of the income inequality trend.
Diretrizes para alinhamento dos processos de avaliação da Fundação Oswaldo Cruz às práticas de Ciência Aberta
Creators: name: Maranhão, Ana
Publisher: name: Zenodo
Year: 2024

description: Apresentação realizada na sessão Comunicação II, da 15ª Conferência Lusófona de Ciência Aberta, na Escola Superior de Enfermagem do Porto (ESEP), de 01 a 04 de outubro de 2024.
Μελέτη της κινητικής προσρόφησης μιγμάτων μη ιονικού πολυμερούς και τασενεργών ουσιών στη διεπιφάνεια αέρα / διαλύματος:
Creators: name: Μανουσάκης, Μιχαήλ Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Προσρόφηση
Τασενεργό
Διεπιφάνεια
Adsorption
Surfactants
Interface

description: Σκοπός της διατριβής ήταν η μελέτη της κινητικής προσρόφησης μιγμάτων πολυμερούς με τασενεργές ουσίες στη διεπιφάνεια αέρα / διαλύματος. Εξετάσαμε μίγματα συγκεκριμένων συγκεντρώσεων για την εύρεση της κρίσιμης συγκέντρωσης μικκυλιοποίησης των συγκεκριμένων μιγμάτων αλλά και την μελέτη του χαρακτηριστικού φαινομένου συνέργειας που παρουσιάζουν τα συγκεκριμένα μίγματα. Έτσι, παρουσιάσαμε τα αποτελέσματα των μετρήσεων συγκεκριμένων ουσιών και των μιγμάτων τους συγκρίνοντας τις χαρακτηριστικές καμπύλες αυτών σε διαγράμματα επιφανειακής τάσης / χρόνου (γ/t). Τέλος, καταλήξαμε και παρουσιάσαμε το σύνολο των αποτελεσμάτων, μετά το πέρας των προαναφερθέντων πειραμάτων, αλλά και το σύνολο των συμπερασμάτων τα οποία μας φάνηκαν πολύ χρήσιμα και άκρως ενδιαφέροντα για μελλοντικές μελέτες.
description: The aim of this thesis was to study the adsorption kinetics of mixtures of polymer substances added surfactants at the interface air / solution. We examined mixtures of specific concentrations for finding critical micelle concentration of these mixtures and to study the phenomenon attribute complicity presenting the concrete mixes. So, we presented the results of measurements of specific substances and their mixtures by comparing the characteristic curves in these diagrams surface tension / time curve (c / t). Finally, we presented the result set, after the above experiments, and all the conclusions which seemed to us very interesting and very useful for future studies.
Origin of Structures in Wolf-Rayet Winds: FUSE Observations of WR 135
Creators: name: Marchenko, S. V.
name: Moffat, A. F. J.
name: St-Louis, N.
name: Fullerton, A. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection with FUSE of strong, highly blue-shifted absorption features appearing in the absorption troughs of practically all major P Cygni profiles in the presumably single Wolf-Rayet star WR135. These features also appear in the shock-sensitive OVI 1032/38 Ådoublet, coincident both in time and velocity space with the rest of the lower-ionization species. Choosing between two alternative interpretations: large-scale, coherent structures vs. localized, random shocks, we favor the latter. The absolute value of velocity, as well as velocity dispersion in the shocked region, the density of the shocked gas, and the time scales of the observed variability allow us to relate the observed shocks to the incidence of numerous over-dense clumps (blobs) in the wind of a hot, massive star.
description: 12 pages, 2 figures; to be published in ApJL
Representation of careers in British print media, 1985–2015
Creators: name: Vahidi, Ghazal
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: Using media analysis framework, this study aims is to identify the dominant themes in representation of careers in print media and to explore the possible changes in public discourse narratives of careers from 1985 to 2015 by analysing relevant articles in British newspapers. The study involves examining the use of language and journalistic styles to talk about careers, the nature of any career advice given, metaphors used, and the narrative forms employed.
Over the last few decades, it has been said by many academics that the nature of careers is changing, and the notion of traditional careers based on hierarchical, highly rigid structures and linear direction of prescribed advancement is no longer applicable to the contemporary labour market. This thesis explores whether the anticipated changes that academics in the field of career studies discuss are aligned with the narratives in popular discourse. To achieve this, a structured comparison of the articles concerning careers in selected and contrasting printed media outlets over a 30‐year time span will be analysed alongside academic sources in the field of career studies. The analysis will then identify how popular discourse and academic discourse overlap, diverge and feed into one another.
Investigating both academic literature and popular media in parallel allows the study to develop a contextual perspective which has rarely been the focus of academic research in careerstudies. Assessing the similarities and differences of the dominant academic discourses and inherently social characteristics of the press can provide a setting to draw conclusions about social implications of career theories.
From the methodological perspective, this study offers an innovative way of observing the development of career theories and conducting a comparative analysis, by using a mixed‐ method approach which involves a quantitative study of the media trends and coverage over time as well as the discursive analysis of the selected newspaper articles.
In this study, articles from three British newspapers, The Times, Guardian, and Daily Mail from 1985 to 2015 will be analysed using a combination of content analysis and discourse analysis.
Division sudokus: Invariants, enumeration and multiple partitions
Creators: name: Drápal, Aleš
name: Vojtěchovský, Petr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: Primary: 05B15. Secondary: 20N05

description: A division sudoku is a latin square whose all six conjugates are sudoku squares. We enumerate division sudokus up to a suitable equivalence, introduce powerful invariants of division sudokus, and also study latin squares that are division sudokus with respect to multiple partitions at the same time. We use nearfields and affine geometry to construct division sudokus of prime power rank that are rich in sudoku partitions.
Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
Creators: name: Koponen, T. K.
name: Paananen, T.
name: Martikainen, J. -P.
name: Torma, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present phase diagrams for a polarized Fermi gas in an optical lattice as a function of temperature, polarization, and lattice filling factor. We consider the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO), Sarma or breached pair (BP), and BCS phases, and the normal state and phase separation. We show that the FFLO phase appears in a considerable portion of the phase diagram. The diagrams have two critical points of different nature. We show how various phases leave clear signatures to momentum distributions of the atoms which can be observed after time of flight expansion.
description: Journal version
Probing $p$-wave effects in spin-density separation of Bose mixtures with the dynamic structure factor
Creators: name: Ye, Xiaoran
name: Liang, Zhaoxin
Publisher: name: arXiv
Year: 2025
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Quantum mixtures of Bose gases with tunable $s$- and $p$-wave interactions offer a versatile platform to explore strongly correlated phases and exotic phenomena. While repulsive interactions often drive phase separation, the interplay of $p$-wave interactions with spin-density decoupling remains underexplored. In this work, we employ the path integal field theory to investigate the role of $p$-wave interactions in three-dimensional two-component Bose gas. We derive the Lee-Huang-Yang corrections to the ground-state energy and quantum depletion, revealing how $p$-wave interactions modify equations of state of the model system. Furthermore, we demonstrate that $p$-wave interactions predominantly renormalize the spin-sector effective mass in the language of decoupling the density and spin-density degrees of freedom. This effect manifests in the dynamic structure factor, computed via hydrodynamic theory, where Bragg spectroscopy can detect a tunable splitting between spin and density modes. Our results bridge theoretical predictions with experimental observables, offering insights into anisotropic interaction effects in quantum gases and their implications for probing emergent phases.
description: 12 pages, 3 figures
Generalities of Quarter BPS Dyon Partition Function and Dyons of Torsion Two
Creators: name: Banerjee, Shamik
name: Sen, Ashoke
name: Srivastava, Yogesh K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a general set of constraints on the partition function of quarter BPS dyons in any N=4 supersymmetric string theory by drawing insight from known examples, and study the consequences of this proposal. The main ingredients of our analysis are duality symmetries, wall crossing formula and black hole entropy. We use our analysis to constrain the dyon partition function for two hitherto unknown cases -- the partition function of dyons of torsion two (i.e. gcd(Q\wedge P)=2) in heterotic string theory on T^6 and the partition function of dyons carrying untwisted sector electric charge in Z_2 CHL model. With the help of these constraints we propose a candidate for the partition function of dyons of torsion two in heterotic string theory on T^6. This leads to a novel wall crossing formula for decay of quarter BPS dyons into half BPS dyons with non-primitive charge vectors. In an appropriate limit the proposed formula reproduces the known result for the spectrum of torsion two dyons in gauge theory.
description: LaTeX file, 63 pages
Conspicuous Consumption and Brand Personality: Mirror mirror on the wall tell me does Narcissism and Need for Uniqueness affect Brand Personality?:
Creators: name: Φωτεινιάς, Ορέστης-Αναστάσιος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Προσωπικότητα Μάρκας
Ναρκισσισμός
Ανάγκη για Μοναδικότητα
Brand Personality
Narcissism
Need for Uniqueness

description: Οι επιδεικτικοί καταναλωτές και η σχέση τους με τη συμβολική πλευρά ενός brand αποτελούν αντικείμενο μελέτης της διπλωματικής αυτής. Πιο συγκεκριμένα, μελετάται το πως οι καταναλωτές με ναρκισσιστική προσωπικότητα και οι καταναλωτές με ανάγκη για μοναδικότητα, δυο υποκατηγορίες της επιδεικτικής κατανάλωσης, αξιολογούν την προσωπικότητα ενός brand της επιλογής τους σε σχέση με τους καταναλωτές που δεν επιδεικνύουν ανάγκες επίδειξης των καταναλωτικών τους προτιμήσεων. Έχοντας να επιλέξουν ανάμεσα από δυο brand στην κατηγορία των αξεσουάρ (τσάντας), του ‘ναρκισσιστικού’ brand Louis Vuitton και του ‘μοναδικού’ brand Patchi, και να αξιολογήσουν την προσωπικότητα τους, οι καταναλωτές των υποκατηγοριών αυτών απέδειξαν πως εντοπίζονται στο ίδιο δείγμα. Αναλυτικότερα, καταναλωτές με ανάγκη για μοναδικότητα και ναρκισσιστές εντοπίζονται στο ίδιο δείγμα καταναλωτών ενώ παρουσιάζουν χαμηλότερο μορφωτικό επίπεδο και καλύτερη οικονομική κατάσταση από τον μέσο καταναλωτή. Επιπλέον, οι ναρκισσιστές αντιλαμβάνονται την προσωπικότητα της μάρκας της επιλογής τους πιο θετικά, χαρακτηρίζοντας την ως πιο ενθουσιώδη, ικανή και πολύπειρη. Από την άλλη, οι καταναλωτές με ανάγκη για μοναδικότητα αντιλαμβάνονται την προσωπικότητα μιας μάρκας πιο έντονα αλλά μόνο ως προς την διάσταση ‘ενθουσιώδης’.
description: Conspicuous Consumption and its relation to the symbolic meaning of a brand is the subject of this study. Specifically, this study answers to the research question how differently narcissists and consumers with need for uniqueness, two subcategories of conspicuous consumption, perceive the personality of a brand that they choose/would like to buy compared to consumers that do not like showing off their consumption habits. Having to choose between the ‘narcissist’ brand Louis Vuitton and the ‘unique’ brand Patchi, respondents proved that consumers with need for uniqueness and consumers with narcissistic personality can be found in the same sample while consumers that are prone to conspicuous consumption are less educated and earn more than those who are not prone to conspicuous consumption. Furthermore, narcissists assess the brand personality of their chosen brand more positive since they perceive it as more excited, sophisticated and competent. On the other hand, consumers with need for uniqueness perceive the brand personality of their chosen brand only as more excited.
Improving reproducibility of quantum devices with completely undoped architectures
Creators: name: Srinivasan, A.
name: Farrer, I.
name: Ritchie, D. A.
name: Hamilton, A. R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The reproducible operation of quantum electronic devices is a key requirement for future quantum information processing and spintronics applications. Traditionally quantum devices have been fabricated from modulation doped heterostructures, where there is an intrinsic lack of reproducibility due to the random potential from ionized donors. Here we show that we can greatly improve reproducibility over modulation doped devices by using a completely undoped architecture, with superior uniformity in the confinement potential and more consistent operating voltages for both electron and hole devices. Our results demonstrate that undoped heterostructures have significant advantages over modulation doping for reproducible manufacturing of quantum devices.
Towards a homotopy theory of process algebra
Creators: name: Gaucher, Philippe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Topology (math.AT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 55P99, 68Q85

description: This paper proves that labelled flows are expressive enough to contain all process algebras which are a standard model for concurrency. More precisely, we construct the space of execution paths and of higher dimensional homotopies between them for every process name of every process algebra with any synchronization algebra using a notion of labelled flow. This interpretation of process algebra satisfies the paradigm of higher dimensional automata (HDA): one non-degenerate full $n$-dimensional cube (no more no less) in the underlying space of the time flow corresponding to the concurrent execution of $n$ actions. This result will enable us in future papers to develop a homotopical approach of process algebras. Indeed, several homological constructions related to the causal structure of time flow are possible only in the framework of flows.
description: 33 pages ; LaTeX2e ; 1 eps figure ; package semantics included ; v2 HDA paradigm clearly stated and simplification in a homotopical argument ; v3 "bug" fixed in notion of non-twisted shell + several redactional improvements ; v4 minor correction : the set of labels must not be ordered ; published at http://intlpress.com/HHA/v10/n1/a16/
Benchmark study of symmetry-adapted ML-DFT models for magnetically doped topological insulators
Creators: name: Wasmer, Johannes
name: Mozumder, Rubel
name: Rüssmann, Philipp
name: Assent, Ira
name: Blügel, Stefan
Publisher: name: Forschungzentrum Jülich
Year: 2023

description: WE-Heraeus workshop on First-principles Green function formalisms, GF2023, Athens, RWTH Aachen University, Greece, 4 Sep 2023 - 7 Sep 2023
description: We present a benchmark study of surrogate models for impurities embedded into crystalline solids. Using the Korringa-Kohn-Rostoker Green Function method [1], we have built databases of several thousand calculations of single impurities (monomers) embedded into different elemental crystals, as well as magnetic transition metal impurity dimers embedded in the topological insulator Bi2Te3. We predict the converged monomer impurity electron potential and the isotropic exchange interaction of the impurity dimer in the classical Heisenberg model. From these surrogates, we intend to build transferable models for larger systems in the future, which will accelerate the convergence of our DFT codes. The study compares various recent E(3)-equivariant models such as ACE and MACE [2] in terms of performance and reproducible end-to-end workflows. [1] P. Rüßmann et al., npj Comput Mater 7, 13 (2021) [2] I. Batatia et al., arXiv:2206.07697 (2022)
Statistical Signatures of Nanoflare Activity. II. A Nanoflare Explanation for Periodic Brightenings in Flare Stars observed by NGTS
Creators: name: Dillon, Christopher J.
name: Jess, David B.
name: Mathioudakis, Michail
name: Watson, Christopher A.
name: Jackman, James A.
name: Wheatley, Peter J.
name: Goad, Michael R.
name: Casewell, Sarah L.
name: Anderson, David R.
name: Burleigh, Matthew R.
name: Raynard, Liam
name: West, Richard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Several studies have documented periodic and quasi-periodic signals from the time series of dMe flare stars and other stellar sources. Such periodic signals, observed within quiescent phases (i.e., devoid of larger-scale microflare or flare activity), range in period from $1-1000$ seconds and hence have been tentatively linked to ubiquitous $p$-mode oscillations generated in the convective layers of the star. As such, most interpretations for the observed periodicities have been framed in terms of magneto-hydrodynamic wave behavior. However, we propose that a series of continuous nanoflares, based upon a power-law distribution, can provide a similar periodic signal in the associated time series. Adapting previous statistical analyses of solar nanoflare signals, we find the first statistical evidence for stellar nanoflare signals embedded within the noise envelope of M-type stellar lightcurves. Employing data collected by the Next Generation Transit Survey (NGTS), we find evidence for stellar nanoflare activity demonstrating a flaring power-law index of $3.25 \pm 0.20 $, alongside a decay timescale of $200 \pm 100$ s. We also find that synthetic time series, consistent with the observations of dMe flare star lightcurves, are capable of producing quasi-periodic signals in the same frequency range as $p$-mode signals, despite being purely comprised of impulsive signatures. Phenomena traditionally considered a consequence of wave behaviour may be described by a number of high frequency but discrete nanoflare energy events. This new physical interpretation presents a novel diagnostic capability, by linking observed periodic signals to given nanoflare model conditions.
description: 22 Pages, 8 figures, accepted for publication by ApJ
Σύντομες εκφράσεις πόλεων στα κείμενα των ιστορικών της Άλωσης ( 15ος αιώ. μ.Χ. ):
Creators: name: Παυλακούδης, Δημήτριος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εκφράσεις
Άλωση
Βυζάντιο
Εkphrasis
Byzantine
Fall

description: Η παρούσα διπλωματική εργασία που εκπονήθηκε στα πλαίσια του Προγράμματος Μεταπτυχιακών σπουδών της Μεσαιωνικής ελληνικής φιλολογίας του τμήματος Φιλολογίας πραγματεύεται τα στοιχεία εκφράσεων , ιδιαίτερου λογοτεχνικού είδους της βυζαντινής γραμματείας , όπως απαντώνται στα έργα των τεσσάρων ιστορικών της περιόδου της Αλώσεως (15ος αιώ μ . Χ. ) . Συγκεκριμένα εξετάζονται και αναζητούνται τα στοιχεία συντόμων εκφράσεων πόλεων και τόπων που εντοπίζονται στο ιστορικό έργο του Λαονίκου Χαλκοκονδύλη , του Κριτοβούλου του Ιμβρίου , του Γεωργίου Σφραντζή και του Μιχαήλ Δούκα . Παρατίθεται αρχικώς εισαγωγή σχετική με τη θεωρία της Έκφρασης ως λογοτεχνικού είδους , έπεται χωρίο με το ιστορικό πλαίσιο της εποχής της Αλώσεως και το κύριο μέρος με τα στοιχεία εκφράσεως στα προαναφερόμενα ιστορικά έργα της ύστερης βυζαντινής περιόδου.
description: This thesis was produced as part of the Postgraduate Studies in Medieval Literature Greek Literature section addresses elements of Ekfrasis a kind of particular literary genre of Byzantine literature, as found in the works of four historians of the fall season (15th aio m. BC) . Specifically considered and sought details of short expressions cities and sites identified in the historical work of Laonicus Chalkokondilis of Kritovoulos of Imbros , Sfrantzi George and Michael Doukas. Listed on initial introduction to the theory of Expression as a literary genre, following passage of the historical context of the fall season and the main portion of the elements of expression in those historical works from the late Byzantine period.
Τρισδιάστατη αποτύπωση σπηλαίου Πετραλώνων με σαρωτή laser
Creators: name: Κοϊμτζόγλου, Δήμητρα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Σαρωτής Laser
Σπήλαιο
Τρισδιάστατη
Laser scanner
Cave
3D

description: Το αντικείμενο της παρούσας μεταπτυχιακής διπλωματικής εργασίας είναι η τοπογραφική τεκμηρίωση - χαρτογράφηση του σπηλαίου Πετραλώνων Χαλκιδικής στη Βόρεια Ελλάδα (Σπήλαιο Κόκκινων Πετρών) με τη χρήση τρισδιάστατου σαρωτή laser. Η περιοχή αποτύπωσης αφορά στο επισκέψιμο τμήμα του σπηλαίου. Για το σπήλαιο των Πετραλώνων μια τέτοιου είδους μελέτη αποτελεί πρωτοπορία λόγω της εφαρμογής σύγχρονων και εξελιγμένων μεθοδολογιών αποτύπωσης μιας και μέχρι πρότινος είχαν πραγματοποιηθεί χαρτογραφήσεις με εμπειρικό τρόπο, τα αποτελέσματα των οποίων παραμένουν αξιόλογα. Ο στόχος μιας τέτοιας εργασίας είναι η λεπτομερής τεκμηρίωση της υπάρχουσας κατάστασης του σπηλαίου το οποίο, όντας ενεργό, ανασχηματίζεται, διαμορφώνεται και ωριμάζει μέσα στο χρόνο. Έτσι τα αποτελέσματα της μελέτης θα αποτελέσουν πηγή πληροφοριών για την ιστορική εξέλιξη του σπηλαίου. Πέρα από τον φυσικό πλούσιο σπηλαιοδιάκοσμο που αποτελεί αντικείμενο ενδιαφέροντος από πολλές απόψεις, γεωλογική, τοπογραφική, εικαστική κ.α., το σπήλαιο των Πετραλώνων αποτελεί μνημείο και σημείο αναφοράς στην ιστορία της εξέλιξης του ανθρώπινου είδους λόγω των ευρημάτων του που παρουσιάζουν έντονο παλαιοανθρωπολογικό και παλαιοντολογικό ενδιαφέρον . Εύλογα λοιπόν προκύπτει το ενδιαφέρον από διάφορες διεπιστημονικές ομάδες για συνεχή εξερεύνηση, τεκμηρίωση, προστασία και διατήρηση του σπηλαίου των Πετραλώνων.
description: The subject of the present master thesis is the topographic documentation- mapping of Petralona cave in northern Greece Halkidiki (Red Stone Cave) using a three-dimensional laser scanner. The capture area focuses on the visitors section of the cave. For the Petralona cave such a study appears to be a breakthrough by the application of modern and advanced methodologies of surveying in contrary to previous empirical mapping, whose results remain remarkable. The aim of such work is the detailed documentation of the current situation of the cave which, being active, continually reshapes, forms and matures over time. So the results of this study will be a source of information on the historical development of the cave. Besides the rich and natural cave decoration which seems to be the subject of interest in many aspects, geological, topographical, visual, etc., the Petralona cave is also a monument and a benchmark in the history of the evolution of mankind because of findings showing intense paleoanthropological and paleontological interest. Therefore interest arises from several multidisciplinary teams for continuous exploration, documentation, protection and preservation of the Petralona cave.
Measuring $D^0-\bar D^0$ mixing in $D^0(\bar D^0)\to f_0(980) K^{*}$ and more
Creators: name: Wang, Wei
name: Lu, Cai-Dian
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the $D^0-\bar D^0$ mixing through the doubly Cabibbo suppressed (DCS) channel $D^0\to f_0(980)K^{*0}$ and its charge conjugate channel, in which the $K^{*0}$ meson is reconstructed in both $K^+π^-$ and $K_Sπ^0$ final state. Although the decay $D^0\to f_0(980)K^{*}$ has a small branching ratio, the final state mesons are relatively easy to identify. The $f_0(980)$ meson can be replaced by $π^+π^-$ in which $π^+π^-$ form an $S$-wave state, or a longitudinally polarized vector meson $ρ^0,ω$. All mixing parameters, including the mass difference and decay width difference, can be extracted by studying the time-dependent decay width of these channels. We show that the method is valid in all regions for mixing parameters and it does not depend on the strong phase difference.
description: 7 pages revtex4, no figure
Radiation-magnetohydrodynamics with MPI-AMRVAC using flux-limited diffusion
Creators: name: Narechania, Nishant
name: Keppens, Rony
name: ud-Doula, Asif
name: Moens, Nicolas
name: Sundqvist, Jon
Publisher: name: arXiv
Year: 2025
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Context. Radiation plays a significant role in solar and astrophysical environments as it may constitute a sizeable fraction of the energy density, momentum flux, and the total pressure. Modelling the dynamic interaction between radiation and magnetized plasmas in such environments is an intricate and computationally costly task. Aims. The goal of this work is to demonstrate the capabilities of the open-source parallel, block-adaptive computational framework MPI-AMRVAC, in solving equations of radiation-magnetohydrodynamics (RMHD), and to present benchmark test cases relevant for radiation-dominated magnetized plasmas. Methods. The existing magnetohydrodynamics (MHD) and flux-limited diffusion (FLD) radiative-hydrodynamics physics modules are combined to solve the equations of radiation-magnetohydrodynamics (RMHD) on block-adaptive finite volume Cartesian meshes in any dimensionality. Results. We introduce and validate several benchmark test cases such as steady radiative MHD shocks, radiation-damped linear MHD waves, radiation-modified Riemann problems and a multi-dimensional radiative magnetoconvection case. We recall the basic governing Rankine-Hugoniot relations for shocks and the dispersion relation for linear MHD waves in the presence of optically thick radiation fields where the diffusion limit is reached. The RMHD system allows for 8 linear wave types, where the classical 7-wave MHD picture (entropy and three wave pairs for slow, Alfven and fast) is augmented with a radiative diffusion mode. Conclusions. The MPI-AMRVAC code now has the capability to perform multidimensional RMHD simulations with mesh adaptation making it well-suited for larger scientific applications to study magnetized matter-radiation interactions in solar and stellar interiors and atmospheres.
description: Accepted to Astronomy and Astrophysics journal
Solar-like oscillation amplitudes and line-widths as a probe for turbulent convection in stars
Creators: name: Samadi, R.
name: Belkacem, K.
name: Goupil, M. -J.
name: Kupka, F.
name: Dupret, M. -A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Excitation of solar-like oscillations is attributed to turbulent convection and takes place at the upper-most part of the outer convective zones. Amplitudes of these oscillations depend on the efficiency of the excitation processes as well as on the properties of turbulent convection. We present past and recent improvements on the modeling of those processes. We show how the mode amplitudes and mode line-widths can bring information about the turbulence in the specific cases of the Sun and Alpha Cen A.
description: 9 pages ; 3 figures ; invited talk given during the Symposium no. 239 "Convection in Astrophysics", International Astronomical Union., held 21-25 August, 2006 in Prague, Czech Republic
Recursion Relations for One-Loop Gravity Amplitudes
Creators: name: Brandhuber, Andreas
name: McNamara, Simon
name: Spence, Bill
name: Travaglini, Gabriele
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the application of recursion relations to the calculation of finite one-loop gravity amplitudes. It is shown explicitly that the known four, five, and six graviton one-loop amplitudes for which the external legs have identical outgoing helicities, and the four graviton amplitude with helicities (-,+,+,+) can be derived from simple recursion relations. The latter amplitude is derived by introducing a one-loop three-point vertex of gravitons of positive helicity, which is the counterpart in gravity of the one-loop three-plus vertex in Yang-Mills. We show that new issues arise for the five point amplitude with helicities (-,+,+,+,+), where the application of known methods does not appear to work, and we discuss possible resolutions.
description: 28 pages, LaTeX, 12 figures. v2:typos and references corrected
A variety of Steiner loops satisfying Moufang's theorem: A solution to Rajah's Problem
Creators: name: Drápal, Aleš
name: Vojtěchovský, Petr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20N05, 05B07

description: A loop $X$ is said to satisfy Moufang's theorem if for every $x,y,z\in X$ such that $x(yz)=(xy)z$ the subloop generated by $x$, $y$, $z$ is a group. We prove that the variety $V$ of Steiner loops satisfying the identity $(xz)(((xy)z)(yz)) = ((xz)((xy)z))(yz)$ is not contained in the variety of Moufang loops, yet every loop in $V$ satisfies Moufang's theorem. This solves a problem posed by Andrew Rajah.
Gas excitation in galaxies and active galactic nuclei with He IIλ4686 and X-ray emission
Creators: name: Kouroumpatzakis, K.
name: Svoboda, J.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The origin of He II emission in galaxies remains a debated topic, requiring ionizing photons with energies exceeding 54 eV. While massive stars, such as Wolf-Rayet stars, have been considered potential sources, their UV flux often fails to fully explain the observed He II emission. Recent studies suggest that X-ray binaries (XRBs) might contribute significantly to this ionization. We explore the relationship between X-ray and $\rm He~II \lambda4686$ emission in a statistically significant sample of galaxies, investigating whether X-ray sources, including active galactic nuclei (AGNs) and XRBs, serve as the primary mechanism for He II ionization across different galactic environments. We cross-matched a sample of known well-detected He II galaxies with the Chandra Source Catalog, yielding 165 galaxies with X-ray and $\rm He~II \lambda4686$ detections. The sources were classified into star-forming galaxies (SFGs) and AGNs based on the BPT diagram and a classification scheme defined for He II galaxies. We find a strong, linear correlation between X-ray and He II luminosity across AGNs and SFGs spanning over seven orders of magnitude. AGNs generally exhibit higher He II/H$β$ flux ratios, stronger extinction, and harder X-ray spectra. The O32 ratio of SFGs is tightly correlated with the H$β$ equivalent width ($\rm EW_{Hβ}$) but not with the He II/H$β$ ratio, suggesting a different excitation mechanism. We derive an O32--$\rm EW_{Hβ}$ line above which only AGNs of our sample reside. The tight correlation between X-ray and He II luminosity supports X-rays as the primary driver of He II excitation. While AGNs have one common ionization source, the central black hole, in SFGs low-energy species are mainly excited by UV emission related to star-forming activity, however, high-energy species like He II require the presence of XRBs.
description: 14 + 2 appendix pages, 7 figures, 1 table. Accepted for publication in A&A on March 3, 2025. Updated to match the published version
The Flavor Group Delta(3n^2)
Creators: name: Luhn, Christoph
name: Nasri, Salah
name: Ramond, Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The large neutrino mixing angles have generated interest in finite subgroups of SU(3), as clues towards understanding the flavor structure of the Standard Model. In this work, we study the mathematical structure of the simplest non-Abelian subgroup, Delta(3n^2). Using simple mathematical techniques, we derive its conjugacy classes, character table, build its irreducible representations, their Kronecker products, and its invariants.
description: 29 pages, one table, typos corrected, matches published version
The Depiction of Coronal Structure in White Light Images
Creators: name: Morgan, Huw
name: Habbal, Shadia Rifai
name: Woo, Richard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The very sharp decrease of density with heliocentric distance makes imaging of coronal density structures out to a few solar radii challenging. The radial gradient in brightness can be reduced using numerous image processing techniques, thus quantitative data are manipulated to provide qualitative images. Introduced in this study is a new normalizing radial graded filter (NRGF), a simple filter for removing the radial gradient to reveal coronal structure. Applied to polarized brightness observations of the corona, the NRGF produces images which are striking in their detail. Total brightness white light images include contributions from the F corona, stray light and other instrumental contributions which need to be removed as effectively as possible to properly reveal the electron corona structure. A new procedure for subtracting this background from LASCO C2 white light total brightness images is introduced. The background is created from the unpolarized component of total brightness images and is found to be remarkably time-invariant, remaining virtually unchanged over the solar cycle. By direct comparison with polarized brightness data, we show that the new background subtracting procedure is superior in depicting coronal structure accurately, particularly when used in conjunction with the NRGF. The effectiveness of the procedures is demonstrated on a series of LASCO C2 observations of a coronal mass ejection (CME).
description: 10 pages, 5 figures
The experience of career development in women with bulimia nervosa
Creators: name: Silverton, Toby Irene
Publisher: name: University of British Columbia
Year: 2009

description: A case study approach using multiple-case design was used to investigate and describe the experience of career development for eight women who had experienced bulimia nervosa. The researcher conducted in-depth interviews with participants. Analysis of the interviews revealed seven chapters and a common story of the chronology of the participants' experiences of career development, including the role bulimia nervosa played in this process. A process of career development revealed an initial sense of career interest, ability and self knowledge interrupted by invalidation leading to a sense of loss of self including career identity. Bulimia nervosa became part of the mechanism employed to deal with the loss of self-identity. During counselling participants rediscovered their original career interests and resumed the developmental process. These results relate to and expand upon previous research and clinical observations of career development in this group of women. Recommendations for future research and counselling practice were made.