cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spinning black holes as cosmic string factories
Creators: name: Xing, Hengrui
name: Levin, Yuri
name: Gruzinov, Andrei
name: Vilenkin, Alexander
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the evolution of a cosmic string loop that is captured by a much more massive and compact black hole. We show that after several reconnections that produce ejections of smaller loops, the loop that remains bound to the black hole moves on a nearly-periodic non-self-intersecting trajectory, "the orbit". The orbit evolves due to an energy and angular momentum exchange between the loop and the spinning black hole. We show that such evolution is mathematically equivalent to a certain continuous deformation of an auxiliary closed curve in a 3-dimensional space; for zero black-hole spin this deformation is curve-shortening that has been extensively studied by mathematicians. The evolution features competing effects of loop growth by the superradiant extraction of the black-hole spin energy, and loop decay by the friction of the moving string against the horizon. A self-intersection of an auxiliary curve corresponds to a capture by the black hole of a new string segment and thus an addition of a new captured loop. Possible asymptotic states of such evolution are shown to be strong emitters of gravitational waves. Whether reconnections prevent reaching the asymptotic states remains to be explored. Additionally, the orbit's shape also evolves due to an emission of gravitational waves, and a recoil of the black hole that changes the orbit and likely leads to self-intersections. We argue that for a significant range of the dimensionless tension $μ$, string loops are captured by supermassive black holes at the centers of galaxies. This strongly motivates further study of interaction between string loops and black holes, especially the influence of this process on the black hole spindown and on the production of gravitational waves by strings created in galactic nuclei. We also discuss potential loop captures by primordial black holes.
description: 22 pages, 11 figures. to be submitted to Physical Review D
Rashba interferometers: Spin-dependent single and two-electron interference
Creators: name: Zuelicke, U.
name: Signal, A. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum transport in semiconductor nanostructures can be described theoretically in terms of the propagation and scattering of electron probability waves. Within this approach, elements of a phase-coherent electric circuit play a role similar to quantum-optical devices that can be characterised by scattering matrices. Electronic analogues of well-know optical interferometers have been fabricated and used to study special features of charge carriers in solids. We present results from our theoretical investigation into the interplay between spin precession and quantum interference in an electronic Mach-Zehnder interferometer with spin-orbit coupling of the Rashba type. Intriguing spin-dependent transport effects occur, which can be the basis for novel spintronic devices such as a magnet-less spin-controlled field-effect transistor and a variety of single-qubit gates. Their functionality arises entirely from spin-dependent interference of each single input electron with itself. We have also studied two-electron interference effects for the spin-dependent Mach-Zehnder interferometer, obtaining analytical expressions for its two-fermion-state scattering matrix. Using this result, we consider ways to generate two-electron output states for which the Rashba spin-subband quantum number and the output-arm index are entangled. Combining spin-dependent interference in our proposed Mach-Zehnder interferometer with a projective charge measurement at the output enables entanglement generation. As our particular scheme involves tuneable spin precession, electric-field control of entanglement production can be achieved.
description: 7 pages, 5 figures, Elsevier style, submitted to special issue of Solid State Communications, v2: replacement to rectify formatting problems, v3: minor changes + 3 references added
Προσεγγίσεις στο χώρο της διδακτικής της φυσικής: πως μαθητές και μελλοντικοί εκπαιδευτικοί στη Γαλλία εξηγούν το σχηματισμό των σκιών στην οπτική. Μια μελέτη περίπτωσης
Creators: name: Καλογιαννάκης, Μ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Additional file 7 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 7. Sewerage access, provinces of Peru, 2005–2015. Map of Peru indicating provinces with varying levels of access to a toilet connected to the sewerage system.
Stochastic dynamics of macromolecular-assembly networks
Creators: name: Saiz, Leonor
name: Vilar, Jose M. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The formation and regulation of macromolecular complexes provides the backbone of most cellular processes, including gene regulation and signal transduction. The inherent complexity of assembling macromolecular structures makes current computational methods strongly limited for understanding how the physical interactions between cellular components give rise to systemic properties of cells. Here we present a stochastic approach to study the dynamics of networks formed by macromolecular complexes in terms of the molecular interactions of their components. Exploiting key thermodynamic concepts, this approach makes it possible to both estimate reaction rates and incorporate the resulting assembly dynamics into the stochastic kinetics of cellular networks. As prototype systems, we consider the lac operon and phage lambda induction switches, which rely on the formation of DNA loops by proteins and on the integration of these protein-DNA complexes into intracellular networks. This cross-scale approach offers an effective starting point to move forward from network diagrams, such as those of protein-protein and DNA-protein interaction networks, to the actual dynamics of cellular processes.
description: Open Access article available at http://www.nature.com/msb/journal/v2/n1/full/msb4100061.html
View-invariant action recognition
Creators: name: Rawat, Yogesh S
name: Vyas, Shruti
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Human action recognition is an important problem in computer vision. It has a wide range of applications in surveillance, human-computer interaction, augmented reality, video indexing, and retrieval. The varying pattern of spatio-temporal appearance generated by human action is key for identifying the performed action. We have seen a lot of research exploring this dynamics of spatio-temporal appearance for learning a visual representation of human actions. However, most of the research in action recognition is focused on some common viewpoints, and these approaches do not perform well when there is a change in viewpoint. Human actions are performed in a 3-dimensional environment and are projected to a 2-dimensional space when captured as a video from a given viewpoint. Therefore, an action will have a different spatio-temporal appearance from different viewpoints. The research in view-invariant action recognition addresses this problem and focuses on recognizing human actions from unseen viewpoints.
Additional file 6 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 6. Association between meteorological factors and incidence rate of childhood clinic visits for diarrhea, controlling for rotavirus vaccination and secular trend, 61 provinces of Peru with higher temperature variability, by piped water access, 2005–2015. Sensitivity analysis table, provinces with higher temperature variability.
On the two-phase framework for joint model and design-based inference
Creators: name: Rubin-Bleuer, Susana
name: Kratina, Ioana Schiopu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62F12 (Primary) 62D05 (Secondary)

description: We establish a mathematical framework that formally validates the two-phase ``super-population viewpoint'' proposed by Hartley and Sielken [Biometrics 31 (1975) 411--422] by defining a product probability space which includes both the design space and the model space. The methodology we develop combines finite population sampling theory and the classical theory of infinite population sampling to account for the underlying processes that produce the data under a unified approach. Our key results are the following: first, if the sample estimators converge in the design law and the model statistics converge in the model, then, under certain conditions, they are asymptotically independent, and they converge jointly in the product space; second, the sample estimating equation estimator is asymptotically normal around a super-population parameter.
description: Published at http://dx.doi.org/10.1214/009053605000000651 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Additional file 5 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 5. Annual rate of clinic visits for childhood diarrhea in Peru, by level of access to piped water, 2005–2015. Figure of the annual rate of clinic visits for childhood diarrhea in Peru, by level of access to piped water, 2005–2015.
Διαδικασίες διδακτικής αλληλεπίδρασης και γνωστικοί μετασχηματισμοί:η τριβή ολίσθησης στη σκέψη παιδιών 5-6 ετών
Creators: name: Ραβάνης, Κ.
name: Αποστολίδου, Μ.
name: Ασβεστά, Ε.
name: Κολιόπουλος, Δ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The friction is a physical phenomenon, which impedes the movement of an object on the surface of another one. In the case of an object moves on a horizontal level, the friction depends on two factors: the weight of the moving object and the nature of the surfaces in contact. If a child understands that the movement of an object on a horizontal level depends on these two factors, then in fact he handles in a functional way the parameters that the friction is related to. In this study, is presented an effort of teaching interaction with pre-school children, having as an object toe understanding of the factors that the friction depends on when it is performed on an object that freely moves on a horizontal surface.
description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Afrika tarig'ini etishtirishda tuproqning tarkibini o'rganish
Creators: name: Seytekova Miuagul Tanirbergenovna
Publisher: name: Zenodo
Year: 2024

description: Maqolada Afrika tarig’ini etishtirishda tuproq tarkibining ahamiyati va tuproq qatlamlarda  tuproq tarkibining har xilligi, mineral ozuqa miqdorlari tahlil qilingan.
Warnsis ii : A warning signal identification system for the hard of hearing
Creators: name: Dotto, Kim
Publisher: name: University of British Columbia
Year: 2009

description: Having examined a number of common warning signals such a telephone rings, microwave oven alarms and continuous tone alarms, a software method, eliminating the need for specialized hardware, was developed for both recognizing known warning signals and learning new signals. The method, called WARNSIS II was first implemented on a PC-compatible computer using a Creative Labs signal acquisition board which provided a base for graphical signal analysis and for the development of algorithms. The algorithms were also implemented on the Texas Instruments TMS320C30 Evaluation Module (EVM) digital signal processing board to demonstrate that the algorithms can be easily ported to smaller, more cost effective platforms. The WARNSIS II system operates in two modes: learning and recognition. In the learning mode a template for a signal is constructed by analysing the signal for spectral and temporal information. The frequency at which the maximum peak in the signal's spectral energy occurs is determined and this value is saved in a template. The duration of the signal burst, as well as the interval time between signal bursts for repetitive signals, are determined and are also saved in the template. In the recognition mode, the spectrum of the incoming real-time signal is analysed to determine if any of its spectral components match those found in the template. If a match is found, timing information is then applied to rule out transients which would generate false alarms The system has demonstrated the ability to recognize warning signals in high background noise environments and to correctly identify multiple overlapping warning signals.
Additional file 4 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 4. Piped drinking water access, provinces of Peru, 2005–2015. Map of Peru indicating provinces with varying levels of access to piped water.
Higher-Dimensional Bulk Wormholes and their Manifestations in Brane Worlds
Creators: name: Rodrigo, Enrico
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: There is nothing to prevent a higher-dimensional anti-de Sitter bulk spacetime from containing various other branes in addition to hosting our universe, presumed to be a positive-tension 3-brane. In particular, it could contain closed, microscopic branes that form the boundary surfaces of void bubbles and thus violate the null energy condition in the bulk. The possible existence of such micro branes can be investigated by considering the properties of the ground state of a pseudo-Wheeler-DeWitt equation describing brane quantum dynamics in minisuperspace. If they exist, a concentration of these micro branes could act as a fluid of exotic matter able to support macroscopic wormholes connecting otherwise distant regions of the bulk. Were the brane constituting our universe to expand into a region of the bulk containing such higher-dimensional macroscopic wormholes, they would likely manifest themselves in our brane as wormholes of normal dimensionality, whose spontaneous appearance and general dynamics would seem inexplicably peculiar. This encounter could also result in the formation of baby universes of a particular type.
description: 21 pages, 1 figure
Το ζήτημα των μαθητών με διαγνωσμένη Δυσλεξία στο ελληνικό και γερμανικό Γυμνάσιο και οι σχετικές εμπειρίες των εκπαιδευτικών και των διευθυντών. Δύο μελέτες περίπτωσης μαθητών με Δυσλεξία
Creators: name: Τζίκα, Αννα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Μελέτη Περίπτωσης
Δυσλεξία
Ελληνικό και Γερμανικό Γυμνάσιο
Case Studies
Dyslexia
Greek and German high school

description: Σκοπός της διατριβής ήταν να δείξει στον αναγνώστη, πώς σχεδιάζεται και πώς πραγματοποιείται μία έρευνα (εδώ: Μελέτη Περίπτωσης) γύρω από κάποιο ή/και κάποια ερευνητικά ερωτήματα, τα οποία αφορούν σε συγκεκριμένη θεματολογία, με απλή και κατανοητή περιγραφή και απόδοση της μεθοδολογίας στην πράξη, σε συνδυασμό με τη θεωρία της επιστημονικής βιβλιογραφίας και τη χρήση διαδικτυακών πηγών (ιστοσελίδες Υπουργείων Παιδείας, κτλ). Στη συνέχεια παρουσιάστηκαν αναλυτικά τόσο η μεθοδολογία της έρευνας, όπως αυτή εκπονήθηκε κατά τη διάρκεια της διαδικασίας, όσο και τα στοιχεία, τα οποία προέκυψαν, αναφορικά με το ζήτημα των μαθητών με διαγνωσμένες μαθησιακές δυσκολίες (συγκεκριμένα Δυσλεξία) τόσο στο ελληνικό όσο και στο Γερμανικό Γυμνάσιο. Τέλος παρατέθηκαν τα αποτελέσματα των συνεντεύξεων συγκριτικά, συνοδευόμενα από το σχετικό σχολιασμό, σε συσχέτιση με το ερευνητικό πρόβλημα και τα ερευνητικά ερωτήματα, τα οποία εξ’ αρχής είχαν τεθεί.
description: The aim of the present thesis was to show to the reader, how a research process (here: case study) is designed according to particular research questions, which relate to a particular subject, with simple and understandable description and performance of the methodology in practice, combined with the theory of scientific literature and using online sources (websites of ministries of education, etc). Then details of the research methodology as elaborated during the process are given, as well as the elements which have arisen with regard to the issue of pupils with diagnosed learning difficulties (in particular Dyslexia) in both the Greek and the German high school. Following the end results of interviews by comparison to each other, accompanied by the relevant commentary, in association with the research problem and research questions, which had been released.
New gauge boson $B_{H}$ production associated with W boson pair via $γγ$ collision in the littlest Higgs model
Creators: name: Wang, Xuelei
name: Chen, Jihong
name: Liu, Yaobei
name: Liu, Suzhen
name: Yang, Hua
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The littlest Higgs model is the most economical little Higgs model. The observation of the new gauge bosons predicted by the littlest Higgs model could serve as a robust signature of the model. The ILC, with the high energy and luminosity, can open an ideal window to probe these new gauge bosons, specially, the lightest $B_H$. In the framework of the littlest Higgs model, we study a gauge boson $B_{H}$ production process $γγ\to W^{+}W^{-}B_H$. The study shows that the cross section of the process can vary in a wide range($10^{-1}-10^1$ fb) in most parameter spaces preferred by the electroweak precision data. The high c.m. energy(For example, $\sqrt{s}=1500$ GeV) can obviously enhance the cross section to the level of tens fb. For the favorable parameter spaces, the sufficient typical events could be assumed at the ILC. Therefore, our study about the process $γγ\to W^{+}W^{-}B_H$ could provide a useful theoretical instruction for probing $B_H$ experimentally at ILC. Furthermore, such process would offer a good chance to study the triple and quartic gauge couplings involving $B_H$ and the SM gauge bosons which shed important light on the symmetry breaking features of the littlest Higgs model.
description: 19 pages, 4 figures
Additional file 3 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 3. Provinces of Peru with high and low annual temperature variability. A map of the provinces of Peru, indicating those with higher and lower maximum temperature variability, as used in a sensitivity analysis.
Απόψεις δασκάλων για το ρόλο του σχολικού ψυχολόγου
Creators: name: Πούλου, Μ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Additional file 2 of The impact of physical activity and exercise interventions for physical health in people with cystic fibrosis: protocol for a systematic review
Creators: name: Tomlinson, Owen W.
name: Denford, Sarah
name: Barker, Alan R.
name: Schneiderman, Jane E.
name: Campisi, Emma S.
name: Douglas, Helen
name: Rand, Sarah
name: McNarry, Melitta A.
name: Mackintosh, Kelly A.
name: Williams, Craig A.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy

description: Additional file 2. Data Extraction Form.
Reframing the Test Pyramid for Digitally Transformed Organizations
Creators: name: Radziwill, Nicole
name: Freeman, Graham
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The test pyramid is a conceptual model that describes how quality checks can be organized to ensure coverage of all components of a system, at all scales. Originally conceived to help aerospace engineers plan tests to determine how material changes impact system integrity, the concept was gradually introduced into software engineering. Today, the test pyramid is typically used to illustrate that the majority of tests should be performed at the lowest (unit test) level, with fewer integration tests, and even fewer acceptance tests (which are the most expensive to produce, and the slowest to execute). Although the value of acceptance tests and integration tests increasingly depends on the integrity of the underlying data, models, and pipelines, software development and data management organizations have traditionally been siloed and quality assurance practice is not as mature in data operations as it is for software. Companies that close this gap by developing cross-organizational systems will create new competitive advantage and differentiation. By taking a more holistic view of testing that crosses these boundaries, practitioners can help their organizations close the gap.
Morphisms between spaces of leaves viewed as fractions
Creators: name: Pradines, Jean
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 58H05; 18D35

description: Reprint of a 1989 paper including minor corrections of misprints. Added comments (11 pages) about later related papers in the literature concerning comparison of Gabriel-Zisman calculus of (right) fractions and the use of generalized morphims in the sense of Haefliger-Skandalis-Hilsum for inverting differentiable equivalences between Lie groupoids.
description: 26 pages, 3 figures
Ανάλυση λυρικού και ακουστικού μέλους δημοτικών τραγουδιών.
Creators: name: Παπάζογλου-Χαλκιάς, Αναστάσιος Αριστείδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: δημοτικά τραγούδια
ομαδοποίηση
εποπτική αναπαράσταση
folk songs
clustering
visualization

description: Σε αυτή τη διπλωματική εργασία, αντιμετωπίζεται το πρόβλημα της ταξινόμησης και της ομαδοποίησης των ελληνικών δημοτικών τραγουδιών με βάση τη γεωγραφική τους ταυτότητα και τη θεματική κατηγορία στην οποία υπάγονται. Οι στίχοι των τραγουδιών μοντελοποιούνται με τη χρήση των συντελεστών συχνότητας όρου - αντιστρόφου συχνότητας κειμένου. Το μουσικό σήμα παριστάνεται από τους συντελεστές χάσματος στην κλίμακα mel ήχου mel-frequency cepstral coefficients. Αποδεικνύεται ότι τα προαναφερθέντα στοιχεία καταδεικνύουν τον γεωγραφικό τόπο προέλευσης των δημοτικών τραγουδιών. Επιστρατεύονται δύο τεχνικές για την εποπτική αναπαράσταση των διανυσμάτων χαρακτηριστικών, ήτοι η πολυδιάσταστη κλιμάκωση και η t-κατανομή ενσωμάτωσης στοχαστικού γείτονα που οπτικοποιούν δεδομένα υψηλών διαστάσεων, αντιστοιχίζοντας κάθε σημείο σε μια μικρότερη διάσταση. Εφαρμόζεται η πιθανοκρατική ανάλυση λανθάνουσας σημασιολογίας για την ταξινόμηση των τραγουδιών. Η ανάλυση κανονικής συσχέτισης, μια τεχνική για την εξεύρεση συσχετίσεων μεταξύ δυο συνόλων πολυδιάστατων μεταβλητών, εφαρμόζεται στο σύνολο κειμένου και ηχητικών σημάτων με μεγάλο ποσοστό ακρίβειας.
description: In this thesis, the problem of classification and clustering of Greek folk songs based on geographical and thematical context is addressed. Song lyrics are modelled by term frequency - inverse document frequency coefficients. The music signal is represented by mel-frequency cepstral coefficients. It is demonstrated that the aforementioned figures reveal the place of origin of the folk songs. Two techniques are employed to visualize the feature vectors extracted, namely the multidimensional scaling and the t-distributed stochastic neighbor embedding that visualize high-dimensional data by giving each datapoint a lower dimension map. Probabilistic latent semantic analysis has also been tested in song classification. It has been found that the canonical correlation analysis, a well-known technique for finding the correlations between two sets of multidimensional variables, has a high accuracy percentage when applied to the text and audio dataset.
Estimating body mass in the leatherback turtle Dermochelys coriacea
Creators: name: Georges, J. Y.
name: Fossette, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Body mass is a major life history trait and provides a scale for all living processes of organisms. Unfortunately body mass cannot be easily measured for many species, because of the logistical difficulties involved in actually catching and weighing them. This is particularly true for sea turtles which are large vertebrates that spend most of their life at sea. Here we developed a general linear model to predict body mass from 17 morphometric measurements obtained from 49 leatherback turtles nesting in Awala Yalimapo beach, French Guiana, South America. A stepwise backward analysis removing independent parameters with P > 0.001 indicated that body mass can be estimated with 93% accuracy by Body Mass (kg) = - 709.146 + 3.391MedianBodyCirc (cm) + 2.664SCCL (cm), where SCCL is the standard curvilinear carapace length and MedianBodyCirc is body circumference at half of SCCL. A sensibility test showed that this parsimonious model is robust, as estimated body mass may change by 0.7-1.3% for 1-2 cm changes in SCCL, by 0.9-1.7% for 1-2 cm changes in circumference. Leatherback turtles from French Guiana were larger and heavier than in all other nesting sites studied so far, suggesting either that gravid leatherbacks feed during the nesting season in French Guiana, and/or that this species may exhibits site-specific growth strategies. Further studies are required to test these hypotheses, including implementation of similar simple models for other nesting populations, in order to better understand the life history of this endangered species.
Eclipses of jets and discs of X-ray binaries as a powerful tool for understanding jet physics and binary parameters
Creators: name: Maccarone, Thomas J.
name: Eijnden, Jakob van den
name: Russell, Thomas D.
name: Degenaar, Nathalie
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We calculate the expected effects on the spectral energy distributions and light curves in X-ray binary jets from eclipses by the donor stars. Jets will be eclipsed for all inclination angles, with just the height along the jet where the eclipse takes place being set by the orbital parameters. Typically, eclipses will lead to 5-10\% reductions in the jet emission over a range of a factor of few in wavelength with a periodic modulation. In ideal systems with high inclination angles, relatively even mass ratios, and modest jet speeds, the eclipses may be deeper. We discuss how eclipses can be used to measure binary system parameters, as well as the height of the bases of the jets. We also discuss how, with data sets that will likely require future facilities, more detailed tests of models of jet physics could be made, by establishing deviations from the standard recipes for compact conical flat spectrum jets, and by determining the ingress and egress durations of the eclipses and measuring the transverse size of the jets. We provide representative calculations of expectations for different classes of systems, demonstrating that the most promising target for showing this effect in the radio band are the longer period "atoll"-class neutron star X-ray binaries, while in the optical and infrared bands, the best candidates are likely to be the most edge-on black hole X-ray binaries. We also discuss the effects of the outer accretion disc eclipsing the inner jet.
description: 18 pages, 10 figures, accepted to MNRAS
Additional file 2 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 2. Weekly mean of daily high temperatures, moderate/strong El Niño periods, and dry seasons, Lima province, Peru, January 2005–December 2015. Time series plot of daily high temperatures for a province in Peru from 2005 to 2015.
Η επίδραση του οικογενειακού περιβάλλοντος στις αριθμητικές γνώσεις των νηπίων
Creators: name: Λεμονίδης, Χαράλαμπος
name: Χατζηλιαμή, Μ.
name: Κυρίδης, Αργύρης
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The aim of this particular piece; of research was to investigate the level of the mathematic knowledge of infants us well as the existence- of any possible relation between their mathematic knowledge and the socio-economic characteristics of their family (both parents" profession and educational level). T-test analysis and One Way ANOVA was carried out. The results showed trial the ability of infants to recognize numbers is the only one among the eight mathematic capabilities tested, which is affected by parents" socio-economic characteristics.
description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Sommerfeld-corrected relic abundance of wino dark matter with NLO electroweak potentials
Creators: name: Beneke, Martin
name: Szafron, Robert
name: Urban, Kai
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Extending previous work, we calculate the electroweak potentials for all co-annihilation channels of wino dark matter at the one-loop order and obtain the wino relic abundance including the Sommerfeld effect at the next-to-leading order (NLO).
description: 48 pages, LaTeX
Οι περιορισμοί του διευθυντικού δικαιώματος και η δυνατότητα διεύρυνσής του με ρήτρες στην ατομική σύμβαση εργασίας.
Creators: name: Χαδιού, Βαΐα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: διευθυντικό δικαίωμα
ατομική σύμβαση εργασίας
Direction right
consumer's law

description: Σκοπός της εν λόγω διπλωματικής εργασίας ήταν η διαπίστωση του, εάν τα ήδη υπάρχοντα νομοθετικά εργαλεία αρκούν για την προστασία των εργαζόμενων από την καταχρηστική και παράνομη άσκηση του διευθυντικού δικαιώματος, το οποίο ενέχει εν σπέρματι τον κίνδυνο να ξεφύγει από τα όρια του θεμιτού. Το διευθυντικό δικαίωμα, παρότι ανήκει στην κατώτερη βαθμίδα της κλίμακας των πηγών διαμόρφωσης των σχέσεων εργασίας, αποτελεί έναν πολύ σημαντικό παράγοντα συνδιαμόρφωσης των όρων εργασίας. Για αυτό το λόγο και εξετάσαμε την οριοθέτησή του από νομοθετικές διατάξεις, συλλογικές συμβάσεις εργασίας, κανονισμούς εργασίας κ.τ.λ, καθώς αυτά καθορίζουν και τα περιθώρια ανάπτυξής του. Έχοντας, λοιπόν, εξετάσει τους περιορισμούς που τίθενται σε αυτό από τις υπάρχουσες νομοθετικές διατάξεις αλλά και από την ίδια τη σύμβαση εργασίας προβήκαμε στον ακόλουθο έλεγχο: του κατά πόσον οι γενικές ρήτρες και έννοιες του Αστικού Κώδικα μπορούν να προστατεύσουν κατά τρόπο πλήρη και αποτελεσματικό τους εργαζόμενους, είτε από όρους που εντάσσονται στην σύμβαση εργασίας και διευρύνουν το διευθυντικό δικαίωμα του εργοδότη είτε από οδηγίες που απευθύνει ο τελευταίος προς το μισθωτό. Τέλος, έχοντας διαπιστώσει κενά στην απαιτούμενη προστασία υπέρ του εργαζόμενου προτείναμε την αναλογική εφαρμογή του νόμου για την προστασία του καταναλωτή λόγω της ύπαρξης σχετικού κενού δικαίου.
description: The aim of the present thesis was to ascertain, if the existing legislative tools adequate to protect employees from the unfair and against the law practice of the director’s right. Even though the director’s right belongs to the lower level of sources that shape labour relations, it still plays a very significant role in the process of formulating working conditions. That is why we examined the restraints submitted by legislation, collective agreements, labour regulations etc., as these factors seem to determine the exact growth of the director’s right. Having, therefore, examined the restraints submitted by the existing legislation and the contract itself, we wondered whether the general terms and concepts of the Civil Code can fully and effectively protect employees against either general terms and conditions, which are incorporated into the employment contract and expand the director’s right or instructions that are given to the employees during the practicing of the director’s right. Finally, having confirmed legal gaps in the required protection in favour of the employees, we suggested the proportional application of the consumer’s law and specifically the article 2, which protects consumers both of unfair and abusive general terms and conditions and terms that have not been an object of individual negotiation.
Οι σχολικές κυρώσεις στο γυμνάσιο
Creators: name: Ζαφειριάδης, Κ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: The aim of the present study was to investigate the education characteristics (academic achievement, absenteeism) as well as the family characteristics and the academic motivation of high school students who were expelled from school at least once.For this purpose 59 students who were expelled from school and 5') control students pair wished for sex and age completed the motivation questionnaire answering questions about family personal and school characteristics. Data analysis results showed that expelled students were not differentiated Iron control group with regard to a) academic achievement b) academic motivation c) both groups came from intact families. However, they have more absences than any other group of student
description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Slides: Optimal Robust Adaptive Beamforming Design Problems with Nonconvex and/or Convex Uncertainty Sets
Creators: Yongwei Huang
Sergiy A. Vorobyov
Publisher: name: IEEE
Year: 2024

SPS Webinar, 24 September 2024
In this webinar, we first briefly present the history of most significant developments in optimization-based robust adaptive beamforming (RAB). It motivates a formulation of the RAB problem in terms the worst-case signal-to-interference-plus-noise ratio (SINR) maximization under a nonconvex uncertainty set for the steering vectors and a convex uncertainty set for the interference-plus-noise covariance matrix, which is the focus of the webinar. The former uncertainty set consists of a similarity constraint and a (nonconvex) double-sided ball constraint while the latter uncertainty set includes a sphere and a positive semidefinite constraint. This problem clearly is nonconvex. To tackle it, the worst-case SINR maximization problem is turned into a quadratic matrix inequality (QMI) problem using the strong duality of semidefinite programming. Then a linear matrix inequality (LMI) relaxation for the QMI problem is proposed, with an additional valid linear constraint. Necessary and sufficient conditions for the tightened LMI relaxation problem to have a rank-one solution are established. When the tightened LMI relaxation problem still has a high-rank solution, the LMI relaxation problem is further restricted to become a bilinear matrix inequality (BLMI) problem. Thus, we propose an iterative algorithm to solve the BLMI problem that finds an optimal/suboptimal solution for the original RAB problem by solving the BLMI formulations. Then, simulation examples are presented to showcase the improved array output SINR of the proposed robust beamformer. If time is permitted, we will present some more recent results on RAB design with robust sidelobe level control.
Additional file 1 of The impact of physical activity and exercise interventions for physical health in people with cystic fibrosis: protocol for a systematic review
Creators: name: Tomlinson, Owen W.
name: Denford, Sarah
name: Barker, Alan R.
name: Schneiderman, Jane E.
name: Campisi, Emma S.
name: Douglas, Helen
name: Rand, Sarah
name: McNarry, Melitta A.
name: Mackintosh, Kelly A.
name: Williams, Craig A.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy

description: Additional file 1. PRISMA-P Checklist.
Αξιολόγηση χρήσης εργαλείων ηλεκτρονικής μάθησης για την ανάπτυξη ανθρωπίνου δυναμικού με έμφαση στη δημιουργία εξατομικευμένων μονοπατιών μάθησης
Creators: name: Τεκτονίδης, Απόστολος Κλέωνα
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Αξιολόγηση αποτελεσματικότητας επιμόρφωσης
Τηλεκπαίδευση εργαζομένων
Επιμόρφωση με εξατομικευμένα μονοπάτια μάθησης
Evaluation of learning impact
Ε-learning of employees
Individual learning paths

description: Ο κύριος στόχος της παρούσας διπλωματικής εργασίας που εκπονήθηκε στο πλαίσιο του Διατμηματικού Προγράμματος Μεταπτυχιακών Σπουδών «Πληροφορική και Διοίκηση» των Τμημάτων Πληροφορικής και Οικονομικών Επιστημών του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης, είναι να διερευνηθούν και να αξιολογηθούν οι παράγοντες που επηρεάζουν και οδηγούν σε επιτυχία την εφαρμογή τεχνολογιών, όπως είναι αυτή του e-learning, κάνοντας χρήση εξατομικευμένων μονοπατιών μάθησης, στα πλαίσια των πολιτικών ανάπτυξης προσωπικού των επιχειρήσεων. Επίσης διερευνήθηκε η αντίληψη των εργαζομένων σχετικά με την e-learning επιμόρφωση. Έγινε προσπάθεια να αναπτυχθούν πολύπλευρα όλα όσα αφορούν την εφαρμογή του e-learning στον εργασιακό χώρο και ειδικότερα στην Ελληνική πραγματικότητα. Η μελέτη περίπτωσης της επιχείρησης Interworks S.A. αποτέλεσε βάσιμο εργαλείο για την επίτευξη των παραπάνω στόχων. Για την ολοκλήρωση της μελέτης αναλύθηκαν έρευνες, που αντλήθηκαν από βιβλία, επιστημονικά άρθρα, περιοδικά και διαδικτυακούς ιστότοπους. Από τις έρευνες που μελετήθηκαν στη βιβλιογραφία, επιλέχτηκε η έρευνα της Πετρίδου (1992) να είναι η βάση για την εμπειρική έρευνα της παρούσας.
description: The main objective of this thesis prepared under the Interdepartmental Program of Postgraduate Studies "Informatics and Management" of the Faculty of Informatics and Economics, Aristotle University of Thessaloniki, is to investigate and evaluate the factors that affect and lead to successful deployment of technologies, such as that of e-learning, using individualized learning paths, according to policies of development of business staff. We, also investigated the perception of employees on the e-learning training. An attempt was made to investigate from different viewpoints most factors related to the application of e-learning in the workplace, particularly in the Greek reality. The case study of business Interworks SA was a key tool for achieving these goals. To complete the study we analyzed surveys from books, scientific articles, magazines and web sites. Among the literature reviewed we selected as a key guidance the research of Petridou (1992) to be the basis for the current empirical investigation.
A Kinetic Study of the N(2D) + C2H4 Reaction at Low Temperature
Creators: name: Hickson, Kevin M.
name: Bray, Cédric
name: Loison, Jean-Christophe
name: Dobrijevic, Michel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Electronically excited nitrogen atoms N(2D) are important species in the photochemistry of N2 based planetary atmospheres such as Titan. Despite this, few N(2D) reactions have been studied over the appropriate low temperature range. During the present work, rate constants were measured for the N(2D) + ethene (C2H4) reaction using a supersonic flow reactor at temperatures between 50 K and 296 K. Here, a chemical reaction was used to generate N(2D) atoms, which were detected directly by laser induced fluorescence in the vacuum ultraviolet wavelength region. The measured rate constants displayed very little variation as a function of temperature, with substantially larger values than those obtained in previous work. Indeed, considering an average temperature of 170 K for the atmosphere of Titan leads to a rate constant that is almost seven times larger than the currently recommended value. In parallel, electronic structure calculations were performed to provide insight into the reactive process. While earlier theoretical work at a lower level predicted the presence of a barrier for the N(2D) + C2H4 reaction, the present calculations demonstrate that two of the five doublet potential energy surfaces correlating with reagents are likely to be attractive, presenting no barriers for the perpendicular approach of the N atom to the carbon double bond of ethene. The measured rate constants and new product channels taken from recent dynamical investigations of this process are included in a 1D coupled ion-neutral model of Titans atmosphere. These simulations indicate that the modeled abundances of numerous nitrogen bearing compounds are noticeably affected by these changes.
description: 21 pages, 5 figures, 2 tables
Asymptotic symmetries on Kerr--Newman horizon without anomaly of diffeomorphism invariance
Creators: name: Koga, Jun-ichirou
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze asymptotic symmetries on the Killing horizon of the four-dimensional Kerr--Newman black hole. We first derive the asymptotic Killing vectors on the Killing horizon, which describe the asymptotic symmetries, and find that the general form of these asymptotic Killing vectors is the universal one possessed by arbitrary Killing horizons. We then construct the phase space associated with the asymptotic symmetries. It is shown that the phase space of an extreme black hole either has the size comparable with a non-extreme black hole, or is small enough to exclude degeneracy, depending on whether or not the global structure of a Killing horizon particular to an extreme black hole is respected. We also show that the central charge in the Poisson brackets algebra of these asymptotic symmetries vanishes, which implies that there is not an anomaly of diffeomorphism invariance. By taking into account other results in the literature, we argue that the vanishing central charge on a black hole horizon, in an effective theory, looks consistent with the thermal feature of a black hole. We furthermore argue that the vanishing central charge implies that there are infinitely many classical configurations that are associated with the same macroscopic state, while these configurations are distinguished physically.
description: 14 pages, v2: references added, minor corrections, v3: new pars and refs. added and corresponding corrections