cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Synchronous machine models for simulation of induction motor
Creators: name: Hung, Ricky P.K.
Publisher: name: University of British Columbia
Year: 2009

description: The induction motor is the most common motor type used in industry. Analyzing its performance is either concerned with steady-state behavior, or the transient behavior during start-up and during system disturbances. Due to the advancement in power electronics, induction motors are now commonly used in adjustable-speed drives. The harmonic currents generated from these drives may result in voltage distortions and potential resonance problems. Computer simulations of induction motor performance are therefore more important than ever before. Although many simulation programs are available for induction motor studies, the Electromagnetic Transients Program (EMTP) is probably better than other simulation packages, because it contains detailed models of many other power system components, such as transformers, transmission lines and thyristors, which must be considered in certain types of motor simulations. This thesis presents a method of using the existing EMTP synchronous machine model to simulate induction motor transients. This approach allows simulations for both machine types using essentially the same program code. The data conversion algorithm, which converts standard motor specifications into equivalent circuit parameters, is explained. The steady-state initialization of an induction motor is discussed as well. The start-up of an induction motor is simulated using the proposed model. These simulation results are then compared with an independent program which uses a 4th-order Runge-Kutta solution method. It is observed that the results from the proposed model agree very well with the ones from the Runge-Kutta solution method.
Fully analog memristive circuits for optimization tasks: a comparison
Creators: name: Sheldon, Forrest C.
name: Caravelli, Francesco
name: Coffrin, Carleton
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We introduce a Lyapunov function for the dynamics of memristive circuits, and compare the effectiveness of memristors in minimizing the function to widely used optimization software. We study in particular three classes of problems which can be directly embedded in a circuit topology, and show that memristors effectively attempt at (quickly) extremizing these functionals.
description: 18 pages, invited book chapter for A. Adamatzky's book "Alternative Computing"
title: TEACHING GEOGRAPHY: GEOGRAPHICAL THINKING AND THE VISIBILITY OF LEARNING
title: ENSINO DE GEOGRAFIA: O PENSAMENTO GEOGRÁFICO E A VISIBILIDADE DA APRENDIZAGEM
titleType: AlternativeTitle
title: ENSEÑANZA DE LA GEOGRAFÍA: PENSAMIENTO GEOGRÁFICO Y VISIBILIDAD DEL APRENDIZAJE
titleType: AlternativeTitle
Creators: name: Gusmão, Adriana David Ferreira
name: Copatti, Carina
name: Silva, Vicente de Paulo da
Publisher: name: Cenas Educacionais
Year: 2023
Subjects: Ensino
Aprendizagem
Geografia
Teaching
Learning
Geography
Enseñanza
Aprendizaje
Geografía

description: Presentation of the Thematic Dossier TEACHING GEOGRAPHY: GEOGRAPHICAL THINKING AND THE VISIBILITY OF LEARNING
description: Apresentação do Dossiê Temático ENSINO DE GEOGRAFIA: O PENSAMENTO GEOGRÁFICO E A VISIBILIDADE DA APRENDIZAGEM
description: Presentación del Dossier Temático ENSEÑANZA DE LA GEOGRAFÍA: PENSAMIENTO GEOGRÁFICO Y VISIBILIDAD DEL APRENDIZAJE
Ανάπτυξη διαδικτυακής εφαρμογής και γραφικού περιβάλλοντος (GUI) με σκοπό τη στατιστική ανάλυση βιοϊατρικών δεδομένων της PubMed
Creators: name: Στάθη, Βάια Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Βιοϊατρικά δεδομένα
Εξόρυξη δεδομένων
Διαδικτυακή Εφαρμογή
Biomedical data
Data mining
Web platform

description: Η PubMed/MEDLINE, μία από τις μεγαλύτερες βάσεις βιοϊατρικών δεδομένων, προσφέρει μεγάλο όγκο πληροφορίας. Ωστόσο, η συνεχώς αυξανόμενη βιβλιογραφία καθιστά δύσκολη την αναζήτηση και την ανάλυσή της από τους ερευνητές. Τα τελευταία χρόνια αναπτύσσονται εργαλεία που κάνουν εξόρυξη δεδομένων από τη διαθέσιμη βιβλιογραφία, προσφέροντας στον ερευνητή νέα πληροφορία και σηματοδοτώντας την είσοδο στην εποχή της σημασιολογικής πληροφορίας. Στην παρούσα διπλωματική εργασία προτείνουμε την διαδικτυακή πλατφόρμα ΤΙΜ, ανεπτυγμένη με τη στατιστική γλώσσα R, που κάνει σε πραγματικό χρόνο στατιστική ανάλυση και εξόρυξη βιοϊατρικών δεδομένων που συλλέχθηκαν από την PubMed/MEDLINE. Προσφέρει δύο εφαρμογές. Η εφαρμογή In-Depth Keyword Analysis αναλύει τα σχετικά δεδομένα με βάση για ένα ερώτημα που θέτει ο χρήστης και η εφαρμογή Research Timeline Overview αναλύει τα διαθέσιμα δεδομένα για μια επιλεγμένη χρονική περίοδο. Η πλατφόρμα είναι εύχρηστη και προσφέρει νέες, μη αναμενόμενες πληροφορίες. Μετάβαση στην πλατφόρμα ΤΙΜ: http://web.32bit.gr:3838/ .
description: PubMed/MEDLINE, one of the largest databases for biomedical literature provides to scientists huge amount of information. The exponential growth of literature have made it very difficult for scientists to find and process all available publications. During the last years, various new tools have been introduced that produce novel information via data mining the available biomedical literature, contributing to the new era of semantic information. We propose the web-based tool, ΤΙΜ, programmed in R statistical language that harnesses the power of PubMed/MEDLINE database to analyze in real-time, statistically and by natural language processing the available biomedical data. TIM has two main features. Research Timeline Overview analyzes all available data for a selected time period. In-Depth Keyword Analysis is more sophisticated, analyzes all relevant data for a query. TIM is easy to use and provides new and unanticipated information. Visit TIM at: http://web.32bit.gr:3838/ .
Nonstationary excitations in Bose-Einstein condensates under the action of periodically varying scattering length with time dependent frequencies
Creators: name: Rajendran, S.
name: Muruganandam, P.
name: Lakshmanan, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate nonstationary excitations in 3D-Bose-Einstein condensates in a spherically symmetric trap potential under the modulation of scattering length with slowly varying frequencies (adiabatic modulation). By numerically solving the Gross-Pitaevskii equation we observe a step-wise increase in the amplitude of oscillation due to successive phase locking between driving frequency and nonlinear frequency. Such a nonstationary excitation has been shown to exist by an analytic approach using variational procedure and perturbation theory in the action-angle variables. By using a canonical perturbation theory, we have identified the successive resonance excitations whenever the driven frequency matches the nonlinear frequency or its subharmonics.
description: 17 pages, 6 figures (to be published in Physica D)
Η εικαστική δραστηριότητα των Ελληνίδων και η προβολή της στα φεμινιστικά περιοδικά του 19ου και του 20ού αιώνα
Creators: name: Κατσαούνη, Ηλέκτρα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Περιοδικά
Φεμινισμός
Ελληνίδες Καλλιτέχνιδες
Magazines
Feminism
Greek women artists

description: Σκοπός της μεταπτυχιακής ήταν η υποδοχή της γυναικείας τέχνης στα γυναικεία περιοδικά του 19ου και 20ού αιώνα στην Ελλάδα και η ανάδειξη του ρόλου τους στην προβολή της γυναίκας στην κοινωνία, στην εργασία και στην τέχνη. Εξετάσαμε το φεμινισμό από την γέννηση του μέχρι και σήμερα και τους λόγους που αναδείχθηκε στην Ευρώπη. Στη συνέχεια παρουσιάσαμε τους ορισμούς, την φεμινιστική θεωρία και τα ξένα περιοδικά τέχνης που ασχολήθηκαν με την φεμινιστική και γυναικεία τέχνη. Ακόμη αναφερθήκαμε στα ελληνικά φεμινιστικά γεγονότα και στα γυναικεία περιοδικά του 19ου και τις πρώτες ελληνίδες καλλιτέχνιδες. Συνεχίζοντας θίξαμε τους γυναικείους αγώνες και τα φεμινιστικά περιοδικά στην Ελλάδα από το 1970 και την ενασχόληση τους και με την τέχνη. Ένα άλλο θέμα που ασχοληθήκαμε είναι τα θέματα τα οποία απασχόλησαν τις καλλιτέχνιδες από το 1970 μέχρι σήμερα και διαπιστώσαμε πόσο προβλήθηκαν οι γυναίκες εικαστικοί μέσα από τα περιοδικά.
description: The purpose of the master was the reception of female art in women’s magazines of the 19th and 20th century in Greece and enhances their role in the promotion of women in society, at work and in art. We examined feminism from its birth until today and the reasons emerged in Europe. Then we presented definitions, feminist theory and foreign art magazines that dealt with feminist and women's art. Even talked to the Greek feminist events and women's magazines of the 19th and the first Greek artist. Continuing we brought the women's struggles and feminist magazines in Greece since 1970 and their involvement with the art. Another issue that we addressed are the issues that preoccupied the artists from 1970 to today and see how women are viewed artists through magazines.
Spectral formulation and WKB approximation for rare-event statistics in reaction systems
Creators: name: Assaf, Michael
name: Meerson, Baruch
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We develop a spectral formulation and a stationary WKB approximation for calculating the probabilities of rare events (large deviations from the mean) in systems of reacting particles with infinite-range interaction, describable by a master equation. We compare the stationary WKB approximation with a recent time-dependent semiclassical approximation developed, for the same class of problems, by Elgart and Kamenev. As a benchmark we use an exactly solvable problem of the binary annihilation reaction 2A -> 0.
description: 11 pages, 10 eps figures
Αυτοεκτίμηση, ''Κέντρο Ελέγχου'' και ''Πιθανοί Εαυτοί '' σε εφήβους
Creators: name: Λεοντάρη, Αγγελική
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1997

description: The present study deals with the interrelatedness between two aspects of personality, namely "possible selves" and "locus of control". Possible selves are regarded as the cognitive manifestations of enduring aspirations and motives, and are considered as the interface between motivation and self-concept. Subjects were 260 high school students attending state schools The Nowicki Strickland Locus of Control Scale and the Culture-free Self-Esteem Inventory were used for the measurement of locus of control and self-esteem respectively. In order to assess possible selves a guided imagery task was used, asking the subjects to imagine themselves in the future and write paragraphs describing their expected, hoped for or feared for selves. The results of the study have interesting implications for our present understanding of the relationships between the above mentioned aspects of personality. Respondents were quite likely to report mainly positive possible selves. Yet they seem to have a relatively constricted sense of possibility, both hoped for and feared for possibility. While the data do not designate specific interventions, they may have practical implications for the provision of a social support system available to adolescents.
description: Παιδαγωγική Επιθεώρηση, Vol. 26 (1997)
The Exomoon Corridor: Half of all exomoons exhibit TTV frequencies within a narrow window due to aliasing
Creators: name: Kipping, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Exomoons are expected to produce potentially detectable transit timing variations (TTVs) upon their parent planet. Unfortunately, distinguishing moon-induced TTVs from other sources, in particular planet-planet interactions, has severely impeded its usefulness as a tool for identifying exomoon candidates. A key feature of exomoon TTVs is that they will always be undersampled, due to the simple fact that we can only observe the TTVs once per transit/planetary period. We show that it is possible to analytically express the aliased TTV periodicity as a function of planet and moon period. Further, we show that inverting an aliased TTV period back to a true moon period is fraught with hundreds of harmonic modes. However, a unique aspect of these TTV aliases is that they are predicted to occur at consistently short periods, irrespective of what model one assumes for the underlying moon population. Specifically, 50% of all exomoons are expected to induce TTVs with a period between 2 to 4 cycles, a range that planet-planet interactions rarely manifest at. This provides an exciting and simple tool for quickly identifying exomoons candidates and brings the TTV method back to the fore as an exomoon hunting strategy. Applying this method to the candidate, Kepler-1625b i, reveals that its TTV periodicity centers around the median period expected for exomoons.
description: Published in MNRAS
Deep neural networks predict drug-induced histopathology based on gene expression
Creators: name: Fang, Tao
name: Sach-Peltason, Lisa
name: Hatje, Klas
name: Maliver, Pierre
name: Phedonos, Alexia
name: Bossen, Claudia
name: Schwandt, Timo
name: Wittwer, Matthias
name: Moisan, Annie
name: Sandrin, Virginie
name: Robinson, Mark
name: Jitao David Zhang
name: EESTech Challenge 2018
Publisher: name: F1000 Research Limited
Year: 2019

description: Successful prediction and a molecular-level understanding of drug-induced organ toxicity are key to reduce both animal use and attrition rate in drug discovery. We leveraged gene-expression data in the Open TG-GATEs database and systematically compared predictive powers of a plethora of machine-learning models of increasing complexity, including logistic regression, support vector machines, and deep neural network (DNNs). DNNs consistently and substantially outperformed other models for almost all types of liver histopathology. The findings were corroborated by benchmark against published models and by a crowd-sourcing approach. We applied DNNs to independent datasets and confirmed their superior performance over other models across technological platforms of gene expression profiling and across rodent species. Finally, we observed that, by using transformed or additional features as input, it is possible to further boost either the interpretability or the performance of DNNs. The present study demonstrates the feasibility and advantage of applying deep-learning techniques to predict drug-induced liver histopathology based on gene expression. Joint application of physiology-emulating cellular systems, omics technologies and machine-learning models such as DNNs holds the promise to replace and reduce animal use in drug discovery and to ensure the safety profiles of drug candidates tested in clinical trials.
Spectral transitions in networks
Creators: name: Palla, Gergely
name: Vattay, Gabor
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We study the level spacing distribution p(s) in the spectrum of random networks. According to our numerical results, the shape of p(s) in the Erdos-Renyi (E-R) random graph is determined by the average degree , and p(s) undergoes a dramatic change when is varied around the critical point of the percolation transition, =1. When > 1, the p(s) is described by the statistics of the Gaussian Orthogonal Ensemble (GOE), one of the major statistical ensembles in Random Matrix Theory, whereas at =1 it follows the Poisson level spacing distribution. Closely above the critical point, p(s) can be described in terms of an intermediate distribution between Poisson and the GOE, the Brody-distribution. Furthermore, below the critical point p(s) can be given with the help of the regularised Gamma-function. Motivated by these results, we analyse the behaviour of p(s) in real networks such as the Internet, a word association network and a protein protein interaction network as well. When the giant component of these networks is destroyed in a node deletion process simulating the networks subjected to intentional attack, their level spacing distribution undergoes a similar transition to that of the E-R graph.
description: 11 pages, 5 figures
Μετανάστευση, πολυπολιτισμικότητα, και Ιθαγένεια: οι κοινωνικές αναπαραστάσεις τους στο Λόγο εκπαιδευτικών
Creators: name: Τσαγάνη, Αλεξάνδρα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: μετανάστευση
ιθαγένεια
κοινωνικές αναπαραστάσεις
immigration
citizenship
social representations

description: Η µελέτη αυτή διερευνά τις αναπαραστάσεις εκπαιδευτικών Πρωτοβάθμιας εκπαίδευσης για τη διαπολιτισμική εκπαίδευση, καθώς και για ζητήματα μεταναστευτικής πολιτικής και ιθαγένειας. Οι συµµετέχοντες ήταν 11 εκπαιδευτικοί από διαφορετικά σχολεία της Θεσσαλονίκης ενώ η συλλογή των δεδομένων έγινε με τη μέθοδο των ημι-δομημένων συνεντεύξεων. Η μέθοδος ανάλυσης που ακολουθήθηκε είναι η ποιοτική ανάλυση περιεχομένου. Τα σημαντικότερα ευρήματα της έρευνας δείχνουν ότι οι εκπαιδευτικοί εμφανίζονται θετικοί απέναντι στη διαπολιτισμική εκπαίδευση και επιθυμούν την περαιτέρω εκπαίδευσή τους σε ζητήματα πολυπολιτισμικότητας και μετανάστευσης. Συνδέουν ωστόσο την πολυπολιτισμικότητα με την ανταλλαγή πολιτισμικών στοιχείων μέσα στην τάξη παρά με αλλαγές σε κοινωνικό και πολιτικό επίπεδο που θα άλλαζαν ουσιωδώς τη ζωή των μεταναστών μαθητών τους. Ο ρατσισμός και οι διακρίσεις παρουσιάζονται ως φαινόμενα που συναντώνται στο σχολείο και στις σχέσεις ανάμεσα στα μέλη της σχολικής κοινότητας. Υπάρχει ωστόσο μια προσπάθεια εξορθολογισμού τους καθώς παρουσιάζονται ως φαινόμενα που μένουν «στα λόγια» και στην επιφάνεια χωρίς να επηρεάζουν δραστικά την ένταξη των μεταναστών μαθητών. Τέλος και η ιθαγένεια αναπαρίσταται κυρίως ως ένα τυπικό προνόμιο που ακόμη και αν παραχωρηθεί στα παιδιά δεν θα βοηθήσει ουσιαστικά στην ενσωμάτωσή τους στην ελληνική κοινωνία.
description: This thesis studies the representations of elementary school educators regarding cross-cultural education, as well as issues of immigration policy and citizenship. There were 11 educators as participants from various elementary schools of Thessaloniki, whilst the collection of the data was performed with the method of semi-structured interviews. The analysis method followed was the qualitative content analysis. The most important findings of the research show that educators are positive towards cross-cultural education and desire further education and training regarding cross-cultural and immigration issues. However, they relate cross-culturality only with the exchange of cultural elements within the classroom and not with changes in social or political level which would essentially change the life of their immigrant students. Racism and discrimination are presented as phenomena occurring in school and the relations among the members of the school community. Nevertheless, there is a rationalization effort of these phenomena as they are presented as superficial without affecting drastically the integration of immigrant students. Finally, the citizenship is represented as the main typical privilege which, even when given to the students, will not effectively help their integration to the Greek society.
Το πρόβλημα της σχολικής ικανότητας υπό το φώς των αποτελεσμάτων εφαρμογής του test Seyfried-Karas τύπου C
Creators: name: Ζάχαρης, Δημήτριος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1997

description: Das Problem der Schulfahigkeif hat uns jahrelang beschäftigt. Die Anwendung des Schulfahigkeitstets von Karas - Seyfried Typ C stellt einen dritten Versuch dar. die Schulfahigkeit der griechischen Kinder, die sich gesetzlich zur Einschulung verpflichtet sind, zu erfassen. Die Ergebnisse von der Anwendung des Tests zeigen, dass ein grosser Teil von Kinder im Alter von 6 Jahren den Anforderungen der griechischen Schulen nicht gewachsen sind. Weitere Untersuchungen auf diesem Gebiet sind dringend notwendig. Weiterhin musste die Einschulung der griechischen Schulkindern nicht nur auf Grund ihres Alters erfolgen.
description: Παιδαγωγική Επιθεώρηση, Vol. 26 (1997)
Ο χώρος Bloch αναλυτικών συναρτήσεων και οι ιδιότητές του
Creators: name: Γεροδήμου, Ιωάννα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Χώρος Bloch
Αναλυτικές συναρτήσεις
Ιδιότητες
Bloch space
Analytic functions
Properties

description: Σκοπός της διατριβής ήταν η μελέτη του χώρου Bloch αναλυτικών συναρτήσεων του μοναδιαίου δίσκου και των ιδιοτήτων του. Αρχικά αναφέρουμε τις έννοιες και τα αποτελέσματα της Μιγαδικής Ανάλυσης τα οποία χρησιμοποιήθηκαν ως βάση στην ανάπτυξη της εργασίας. Έπειτα διατυπώνουμε το θεώρημα του Γάλλου μαθηματικού André Bloch (1893- 1948) οι εργασίες του οποίου οδήγησαν στη δημιουργία των συναρτήσεων Bloch οι οποίες διαμορφώνουν το χώρο Bloch. Εν συνεχεία ορίζουμε τον χώρο Bloch, περιγράφουμε τις ιδιότητές του και ορίζουμε τον κλειστό υπόχωρό του, μικρό Bloch. Συνεχίζουμε μελετώντας τις ιδιότητες δυικότητάς του και εξετάζοντας τη συμπεριφορά των συντελεστών Taylor συναρτήσεων του χώρου Bloch. Δίνουμε επίσης έναν γεωμετρικό χαρακτηρισμό του και καταλήγουμε παρουσιάζοντας μια ιδιότητα μεγίστου την οποία έχει ο χώρος Bloch.
description: The aim of the present thesis was the study of Bloch space of analytic functions of the unit disc and its properties. Primarily we put forward concepts and results of Complex Analysis that are basically used in progress of the thesis. Then we formulate the Theorem of the French mathematician André Bloch whose study led to the setting of Bloch functions which form Bloch space. Furthermore, we define the Bloch space, describe its properties and also define its closed subspace, the little Bloch space. We also examined the duality properties of Bloch space and the behavior of its Taylor coefficients. Another aim of this study was to give a geometrical characterization of Bloch space and to finally describe a maximal property of Bloch space.
Newton-Hooke Algebras, Non-relativistic Branes and Generalized pp-wave Metrics
Creators: name: Brugues, Jan
name: Gomis, Joaquim
name: Kamimura, Kiyoshi
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Newton-Hooke algebras in d dimensions are constructed as contractions of dS(AdS) algebras. Non-relativistic brane actions are WZ terms of these Newton-Hooke algebras. The NH algebras appear also as subalgebras of multi-temporal relativistic conformal algebras, SO(d+1, p+2). We construct generalizations of pp-wave metrics from these algebras.
description: 14 pages, no figure, Added references
Disk management for a hard real-time file system
Creators: name: Cheng, Raymond Man Kit
Publisher: name: University of British Columbia
Year: 2009

description: The problem of scheduling disk requests in a personal hard real-time read/write file system is examined. It is shown that any optimal algorithm for a simplified disk scheduling can be forced to thrash very badly. To avoid thrashing, we propose a fixed-period scan (FSCAN), approach for disk scheduling in our file system. The idea is to use the CSCAN policy to pick up the data blocks requested by a periodic preemptive schedule. The approach trades disk block size and memory buffer size for higher performance. We derive the worst case seek and rotational overhead for the FSCAN algorithm, and we show that the worst-case seek overhead can be measured empirically for a large class of seek functions. Using this approach and utilizing measured seek functions from real disk drives, we show that these policies can transfer data at 40-70% of the maximum transfer rate of modern disk drives, depending on the file system parameters. A configuration program is developed to automatically test and configure the FSCAN algorithm for modern hard disks. The design, implementation and testing of this program are described.
Rydberg-dressed Fermi liquid: correlations and signatures of droplet crystallization
Creators: name: Seydi, Iran
name: Abedinpour, Saeed H.
name: Asgari, Reza
name: Panholzer, Martin
name: Tanatar, B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the effects of many-body correlations on the ground-state properties of a single component ultra-cold Rydberg-dressed Fermi liquid with purely repulsive inter-particle interactions, in both three and two spatial dimensions. We have employed the Fermi-hypernetted-chain Euler-Lagrange approximation and observed that the contribution of the correlation energy on the ground-state energy becomes significant at intermediate values of the soft-core radius and large coupling strengths. For small and large soft-core radii, the correlation energy is negligible and the ground-state energy approaches the Hartree-Fock value. The positions of the main peaks in static structure factor and pair distribution function in the homogeneous fluid phase signal the formation of quantum droplet crystals with several particles confined inside each droplet.
description: 9 pages, 8 figures
Intruder Dynamics in a Frictional Granular Fluid: A Molecular Dynamics Study
Creators: name: Das, Prasenjit
name: Puri, Sanjay
name: Schwartz, Moshe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the dynamics of an intruder moving through a fluidized granular medium in three dimensions ($d=3$). The intruder and grains have both translational and rotational degrees of freedom. The energy-dissipation mechanism is solid friction between all pairs of particles. We keep the granular system fluidized even at rather high densities by randomly perturbing the linear and angular velocities of the grains. We apply a constant external force of magnitude $F$ to the intruder, and obtain its steady state velocity $V_s$ in the center-of-mass frame of the grains. The $F$-$V_s$ relation is of great interest in the industrial processing of granular matter, and has been the subject of most experiments on this problem. We also obtain the mobility, which is proportional to the inverse viscosity, as a function of the volume fraction $ϕ$. This is shown to diverge at the jamming volume fraction. For $ϕ$ below the jamming fraction, we find that $V_s \sim F$ for small $F$ and $V_s \sim F^{1/2}$ for large $F$. The intruder shows diffusive motion in the plane perpendicular to the direction of the external force.
description: 14 Pages, 5 Figs, and 1 Table, Accepted to Phys. Rev. E
Spin-orbit torques and magnetization switching in Gd/Fe multilayers generated by current injection in NiCu alloys
Creators: name: Nasr, Federica
name: Binda, Federico
name: Lambert, Charles-Henri
name: Sala, Giacomo
name: Noël, Paul
name: Gambardella, Pietro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Light transition metals have recently emerged as a sustainable material class for efficient spin-charge interconversion. We report measurements of current-induced spin-orbit torques generated by Ni$_{1-x}$Cu$_{x}$ alloys in perpendicularly magnetized ferrimagnetic Gd/Fe multilayers. We show that the spin-orbit torque efficiency of Ni$_{1-x}$Cu$_{x}$ increases with the Ni/Cu atomic ratio, reaching values comparable to those of Pt for Ni$_{55}$Cu$_{45}$. Furthermore, we demonstrate magnetization switching of a 20-nm-thick Gd/Fe multilayer with a threshold current that decreases with increasing Ni concentration, similar to the spin-orbit torque efficiency. Our findings show that Ni$_{1-x}$Cu$_{x}$$-$based magnetic heterostructures allow for efficient control of the magnetization by electric currents.
A Proposed Network to Detect Axion Quark Nugget Dark Matter
Creators: name: Liang, Xunyu
name: Peshkov, Egor
name: Van Waerbeke, Ludovic
name: Zhitnitsky, Ariel
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A network of synchronized detectors can increase the likelihood of discovering the QCD axion, within the Axion Quark Nugget (AQN) dark matter model. A similar network can also discriminate the X-rays emitted by the AQNs from the background signal. These networks can provide information on the directionality of the dark matter flux (if any), as well as its velocity distribution, and can therefore test the Standard Halo Model. We show that the optimal configuration to detect AQN-induced axions is a triangular network of stations 100 km apart. For X-rays, the optimal network is an array of tetrahedral units.
description: 12 pages, 10 figures, submitted to PRD
Statistical tools to assess the reliability of self-organizing maps
Creators: name: De Bodt, Eric
name: Cottrell, Marie
name: Verleysen, Michel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Results of neural network learning are always subject to some variability, due to the sensitivity to initial conditions, to convergence to local minima, and, sometimes more dramatically, to sampling variability. This paper presents a set of tools designed to assess the reliability of the results of Self-Organizing Maps (SOM), i.e. to test on a statistical basis the confidence we can have on the result of a specific SOM. The tools concern the quantization error in a SOM, and the neighborhood relations (both at the level of a specific pair of observations and globally on the map). As a by-product, these measures also allow to assess the adequacy of the number of units chosen in a map. The tools may also be used to measure objectively how the SOM are less sensitive to non-linear optimization problems (local minima, convergence, etc.) than other neural network models.
description: A la suite de la conf\'{e}rence ESANN 2000
Averaging of thermoacoustic azimuthal instabilities
Creators: name: Ghirardo, Giulio
name: Gant, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We consider the acoustic flow field of rotationally symmetric systems, like an annular combustor and the flow in a round duct, in absence of a mean azimuthal flow field. We focus on azimuthal instabilities, which manifest as either spinning (rotating) waves or standing waves, or a linear combination of the two. These instabilities are often excited by some level of background noise that makes the system randomly change between spinning and standing states, undergo amplitude variations and changes to the azimuthal orientation of the solution. To account for this random change, we make use of a novel ansatz to track as a function of time the amplitude, orientation, nature (standing/spinning) and temporal phase of these instabilities. To capture the effect of the background noise, we apply stochastic averaging on the governing equations and obtain a novel differential equation. The equation allows to study the effects of acoustic sources and sinks on the statistics of the solution, and of explicit and spontaneous symmetry breaking and noise intensity. We focus on this last effect and show how the noise intensity affects the system preference for spinning and/or standing states. We find for example that, when present, background noise pushes the system away from spinning states and towards standing states, consistently with experiments and numerical simulations.
description: Journal of Sound and Vibration (2020)
Καθηγητές της Γερμανικής ως ξένης Γλώσσας στη Γερμανία – Μια μελέτη περίπτωσης
Creators: name: Μπλαχάβα, Μαριάνα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Γερμανικά ως ξένη γλώσσα στη Γερμανία
Καθηγητές Γερμανικών ως ξένης γλώσσας στη Γερμανία
Γερμανικό Ινστιτούτο γερμανικής γλώσσας στη Γερμανία
German as a foreign language in Germany
Teachers of German as a foreign language in Germany
German language Institute in Germany

description: Σκοπός της διατριβής είναι η μελέτη των συνθηκών και των προϋποθέσεων εργασίας του κλάδου της Γερμανικής ως ξένης γλώσσας από την σκοπιά των ξενόγλωσσων καθηγητών σε γερμανικό Ινστιτούτο στη Γερμανία. Επιπρόσθετα να εξεταστεί η σχέση μεταξύ του πλαισίου ενός Ινστιτούτου Γλωσσών και της κατάρτισης των καθηγητών με το σχεδιασμό και την υλοποίηση μαθημάτων. Αναφερθήκαμε αναλυτικά στη σημασία της γερμανικής Γλώσσας αυτής καθαυτής και ως ξένης. Στη συνέχεια εξετάσαμε ειδικά τη Γερμανική ως ξένη και ως δεύτερη γλώσσα σε συνδυασμό με ιστορικά γεγονότα. Ακόμη παρουσιάσαμε τα προγράμματα σπουδών, τις μεθοδολογίες σχετικά με τη Γερμανική ως ξένη γλώσσα, καθώς και τις εργασιακές δυνατότητες.
description: The aim of the present thesis was the study of working conditions and assumptions of the German as a foreign language field on the perspective of foreign language teachers at a German Institute in Germany. Furthermore to examine the relationship of the school context of a language Institute and the teachers education with planning and teaching lessons. We referred to the meaning of the German as a language itself and as a foreign in detail. Besides we examined specially the German as a foreign and as a second language, connecting it with historical incidents. In addition we presented the study programs, the methodologies of German as a foreign language as well as the working possibilities.
Separation of energy scales in the kagome antiferromagnet TmAgGe: a magnetic-field-orientation study up to 55 T
Creators: name: Goddard, P. A.
name: Singleton, J.
name: Lima-Sharma, A. L.
name: Morosan, E.
name: Blundell, S. J.
name: Bud'ko, S. L.
name: Canfield, P. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization $M$ in fields of up to 55 T that show that there are two distinct and separate energy scales present in TmAgGe, each responsible for a set of step-like metamagnetic transitions; weak exchange interactions and strong crystalline electric field (CEF) interactions. Simulations of $M$ using a three-dimensional, free-energy minimization technique allow us to specify for the first time the physical origin of the metamagnetic transitions in low, in-plane fields. We also show that the transitions observed with the field perpendicular to the kagome planes are associated with the CEF-split multiplet of Tm.
Supporting rural women in Arctic low carbon transitions: a knowledge network (Policy Spotlight)
Creators: name: Vuin, Ana
name: Green, Alexa
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 440406
subject: Rural community development
classificationCode: 440609
subject: Rural and regional geography
classificationCode: 350704
subject: Entrepreneurship

description: Rural economies are undergoing significant change as countries seek to meet international climate targets. While this brings new economic opportunities, for example related to renewable energy or forestry, it also brings challenges for those directly or indirectly reliant on carbon-intensive industries.Scientific research on Just Transitions tends to focus on the impacts of low-carbon transitions on those in traditionally male-dominated professions, especially coal miners or oil workers. Yet, international evidence shows that previous rounds of economic restructuring have produced distinctive new labour markets: places most affected by decline in male dominated, energy intensive industries have also seen a rise in female employment in flexible service industries. However, these roles are often insecure and low paid. We also know that women are key contributors to the rural economy and their empowerment is crucial to unlocking talent that can help rural communities become more resilient.
Axial localization of luminophores by partial coherence interferometry
Creators: name: Sandeau, Nicolas
name: Rigneault, Hervé
name: Lenne, Pierre François
name: Giovannini, Hugues
name: Collaboration, the Mosaic
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We propose a solution for increasing the axial resolution of confocal microscopes. In the experimental set-up described in this paper an interference phenomenon between two counterpropagating beams is used to determine the axial position of a luminophore. The optical path difference between the two waves, which is related to the position of the luminophore, is recovered thanks to a second interferometer by using partial coherence interferometry demodulation technique. The proposed solution can find applications in biology for localizing with nanometric resolution a small number of tagged species.
Deep Feature Augmentation for Occluded Image Classification
Creators: name: Cen, Feng
name: Zhao, Xiaoyu
name: Li, Wuzhuang
name: Wang, Guanghui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Due to the difficulty in acquiring massive task-specific occluded images, the classification of occluded images with deep convolutional neural networks (CNNs) remains highly challenging. To alleviate the dependency on large-scale occluded image datasets, we propose a novel approach to improve the classification accuracy of occluded images by fine-tuning the pre-trained models with a set of augmented deep feature vectors (DFVs). The set of augmented DFVs is composed of original DFVs and pseudo-DFVs. The pseudo-DFVs are generated by randomly adding difference vectors (DVs), extracted from a small set of clean and occluded image pairs, to the real DFVs. In the fine-tuning, the back-propagation is conducted on the DFV data flow to update the network parameters. The experiments on various datasets and network structures show that the deep feature augmentation significantly improves the classification accuracy of occluded images without a noticeable influence on the performance of clean images. Specifically, on the ILSVRC2012 dataset with synthetic occluded images, the proposed approach achieves 11.21% and 9.14% average increases in classification accuracy for the ResNet50 networks fine-tuned on the occlusion-exclusive and occlusion-inclusive training sets, respectively.
Διεθνείς Οικονομικές Σχέσεις και Ατελής Ανταγωνισμός: Υποδείγματα, Θέσεις και Ερωτήματα
Creators: name: Τσελεγκαρίδου, Ειρήνη Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διεθνή Οικονομικά
Ανταγωνισμός
Υποδείγματα
International Economics
Competition
Models

description: Στην παρούσα διπλωματική εργασία διερευνούμε τις Διεθνείς Οικονομικές Σχέσεις μεταξύ χωρών και οικονομιών μελετώντας τις σημαντικότερες σχολές και παραδόσεις. Εξετάζουμε το πλαίσιο μέσα στο οποίο μπορεί να κινηθεί κάθε κράτος, βασιζόμενο τόσο σε κυρώσεις, συμφωνίες, διατάξεις και άρθρα διεθνών οργανισμών (όπως ο Παγκόσμιος Οργανισμός Εμπορίου – ΠΟΕ) όσο και σε εγχώριες νομοθετικές πρωτοβουλίες, στις οποίες προβαίνουν οι εκάστοτε κυβερνήσεις. Επιπλέον, κάνουμε αναφορά στις μορφές ανταγωνισμού και την εξ αυτού ανάγκη παρεμβατισμού και /ή προστατευτισμού. Τέλος, παραθέτουμε θέσεις και ερωτήματα στη βάση της ταυτόχρονης ευημερίας των οικονομιών, αλλά και των πολιτών που τις απαρτίζουν.
description: In the present paper, we study the theory of International Economic Relations among the countries and their economies by analyzing the most essential schools and models. We also examine the global normative / legislative framework that affects and limits the choices of every country, being either sanctions, agreements, provisions and articles of national organizations, such as World Trade Organization (WTO), or domestic, governmental legislative initiatives. Furthermore, we refer to the forms of competition and all necessary protection and interventions. Finally, we set relevant theoretical and political questions and suggestions, conditional to simultaneous economic and civilian prosperity.
Φόβοι Κρητών και Κυπρίων φοιτητών
Creators: name: Γεωργίου, Στέλιος Ν.
name: Κρασανάκης, Γεώργιος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1997

description: The study described here compared the fears existing among Cypriot students to those existing among a group of students from Crete. These two islands are culturally very similar to each other, but Cyprus experiences a difficult political situation due to an ethnic conflict that continues between Greek Cypriots and Turkish Cypriots for decades. It was found that Greek Cypriot students reported more intense fears than the students from Crete did in areas related to the war, the end of life and the unknown. These findings are discussed on the basis of the contextual realities of the participants.
description: Παιδαγωγική Επιθεώρηση, Vol. 26 (1997)
From hydrodynamics to N-body simulations of star clusters: mergers and rotation
Creators: name: Ballone, Alessandro
name: Torniamenti, Stefano
name: Mapelli, Michela
name: Di Carlo, Ugo N.
name: Spera, Mario
name: Rastello, Sara
name: Gaspari, Nicola
name: Iorio, Giuliano
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a new method to obtain more realistic initial conditions for N-body simulations of young star clusters. We start from the outputs of hydrodynamical simulations of molecular cloud collapse, in which star formation is modelled with sink particles. In our approach, we instantaneously remove gas from these hydrodynamical simulation outputs to mock the end of the gas-embedded phase, induced by stellar feedback. We then enforce a realistic initial mass function by splitting or joining the sink particles based on their mass and position. Such initial conditions contain more consistent information on the spatial distribution and the kinematical and dynamical states of young star clusters, which are fundamental to properly study these systems. For example, by applying our method to a set of previously run hydrodynamical simulations, we found that the early evolution of young star clusters is affected by gas removal and by the early dry merging of sub-structures. This early evolution can either quickly erase the rotation acquired by our (sub-)clusters in their embedded phase or "fuel" it by feeding of angular momentum by sub-structure mergers, before two-body relaxation acts on longer timescales.
description: 15 pages, 15 figures, accepted on MNRAS
Depth Range Reduction for 3D Range Geometry Compression
Creators: name: Finley, Matthew G.
name: Bell, Tyler
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Multimedia (cs.MM)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Three-dimensional (3D) shape measurement devices and techniques are being rapidly adopted within a variety of industries and applications. As acquiring 3D range data becomes faster and more accurate it becomes more challenging to efficiently store, transmit, or stream this data. One prevailing approach to compressing 3D range data is to encode it within the color channels of regular 2D images. This paper presents a novel method for reducing the depth range of a 3D geometry such that it can be stored within a 2D image using lower encoding frequencies (or a fewer number of encoding periods). This allows for smaller compressed file sizes to be achieved without a proportional increase in reconstruction errors. Further, as the proposed method occurs prior to encoding, it is readily compatible with a variety of existing image-based 3D range geometry compression methods.
description: 16 pages, 6 figures
Fabrication of on-chip probes for double-tip scanning tunneling microscopy
Creators: name: Leeuwenhoek, Maarten
name: Groenewoud, Freek
name: van Oosten, Kees
name: Benschop, Tjerk
name: Allan, Milan P.
name: Gröblacher, Simon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Reduction of the inter-probe distance in multi-probe and double-tip STM down to the nanometer scale has been a longstanding and technically difficult challenge. Recent multi-probe systems have allowed for significant progress by achieving distances of around 30 nm using two individually driven, traditional metal wire tips. For situations where simple alignment and a fixed separation can be advantageous, we here present the fabrication of on-chip double-tip devices that incorporate two mechanically fixed gold tips with a tip separation of only 35 nm. We utilize the excellent mechanical, insulating and dielectric properties of high quality SiN as a base material to realize easy-to-implement, lithographically defined and mechanically stable tips. With their large contact pads and adjustable footprint these novel tips can be easily integrated with most existing commercial combined STM/AFM systems.
Urban green space and happiness in developed countries
Creators: name: Kwon, Oh-Hyun
name: Hong, Inho
name: Yang, Jeasurk
name: Wohn, Donghee Yvette
name: Jung, Woo-Sung
name: Cha, Meeyoung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Urban green space has been regarded as contributing to citizen happiness by promoting physical and mental health. However, how urban green space and happiness are related across many countries of different socioeconomic conditions has not been explained well. By measuring urban green space score (UGS) from high-resolution Sentinel-2 satellite imagery of 90 global cities that in total cover 179,168 km$^2$ and include 230 million people in 60 developed countries, we reveal that the amount of urban green space and the GDP can explain the happiness level of the country. More precisely, urban green space and GDP are each individually associated with happiness; happiness in the 30 wealthiest countries is explained only by urban green space, whereas GDP alone explains happiness in the 30 other countries in this study. Lastly, we further show that the relationship between urban green space and happiness is mediated by social support and that GDP moderates the relationship between social support and happiness, which underlines the importance of maintaining urban green space as a place for social cohesion in promoting people's happiness.
description: 9 pages, 4 figures, supplementary information with 8 figures