cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Υπολογιστική μελέτη της ακτινοβολίας σύνχροτρον και εφαρμογές:
Creators: name: Μαυρίδης, Μιχαήλ Ανθιμου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Σύνχροτρον
Ακτινοβολία
Εκπομπή
Απορρόφηση
Μαγνητικό πεδίο
Φρακταλική διάσταση
Synchrotron
Gyro-synchrotron

description: Η ακτινοβολία που παράγεται από ηλεκτρόνια στο πλάσμα εξαιτίας της κίνησης που προκαλεί σε αυτά μαγνητικό πεδίο οδηγεί σε περίπλοκες , μη αναλυτικές σχέσεις και για αυτό αποτελεί κλάδο ο οποίος χρησιμοποιεί ιδιαίτερα υπολογιστικές και αριθμητικές μεθόδους. Σκοπός της εργασίας αυτής είναι η μελέτη της ακτινοβολίας synchrotron και gyro - synchrotron σε διάφορες περιπτώσεις και εφαρμογές. Αρχικά μελετάμε την φασματική κατανομή της ακτινοβολίας που προκύπτει από διάφορες συναρτήσεις κατανομής της ενέργειας των ηλεκτρονίων και πως επιδρούν οι διάφορες μεταβλητές της κάθε κατανομής στην προκύπτουσα μορφή του φάσματος. Κάτι τέτοιο μπορεί να μας βοηθήσει να ερμηνεύσουμε τα παρατηρούμενα φάσματα από ραδιοτηλεσκόπια και να καταλήξουμε στο μέγεθος των τιμών διαφόρων φυσικών μεγεθών που αφορούν τον ήλιο. Επίσης γίνεται προσπάθεια υπολογισμού της ακτινοβολίας από τρισδιάστατη περιοχή και οπτικοποίηση των αποτελεσμάτων, χρησιμοποιώντας τιμές μαγνητικού πεδίου που προκύπτουν από επεξεργασία μαγνητογραμμάτων και επομένως περιέχουν την πολυπλοκότητα που αυτό παρουσιάζει. Κλείνοντας γίνεται μέτρηση της φρακταλικής διάστασης του πεδίου ακτινοβολίας που προκύπτει.
description: The radiation produced by electrons in plasma because of their motion due to a magnetic field leads to complex, non analytical expressions and and so it is an area where computational and numerical techniques are being used. Goal of our study is the study of synchrotron and gyro – synchrotron radiation in various cases of interest. At the beginning of our study we calculate computationally the emitting gyro – synchrotron and synchrotron spectra using various distribution functions for the radiating electrons energies and we investigate how the variation of the parameters of the distribution functions effect the emitting spectra and its form. This can help us to find the correct values of these parameters in the sun by comparing the produced spectra with observations from radio telescopes. We then try to calculate and visualize, the radiation emitted from a three dimensional area of the sun. The values of the magnetic field at the certain area are reproduced from a real magneto gram of the area so the values carry the magnetic field’s complexity. And at the end we calculate the fractal dimension of the radiation field that we have calculated at the certain three dimensional area and compare with that of the magnetic field
The Role of Type Ia Supernovae in Chemical Evolution I: Lifetime of Type Ia Supernovae and Galactic Supernova Rates
Creators: name: Kobayashi, Chiaki
name: Nomoto, Ken'ichi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We construct a new model of Type Ia Supernovae (SNe Ia), based on the single degenerate scenario, taking account of the metallicity dependences of the white dwarf (WD) wind and the mass-stripping effect on the binary companion star. Our model naturally predicts that the SN Ia lifetime distribution spans a range of 0.1-20 Gyr with the double peaks at ~0.1 and 1 Gyr. While the present SN Ia rate in elliptical galaxies can be reproduced with the old population of the red-giants+WD systems, the large SN Ia rate in radio galaxies could be explained with the young population of the main-sequence+WD systems. Because of the metallicity effect, i.e., because of the lack of winds from WDs in the binary systems, the SN Ia rate in the systems with [Fe/H]1, the predicted SN Ia rate decreases toward higher redshifts and SNe Ia will be observed only in the systems that have evolved with a short timescale of chemical enrichment. This suggests that the evolution effect in the supernova cosmology can be small.
description: 56 pages, 20 figures, accepted to ApJ
Thermally enhanced photoluminescence for energy harvesting: from fundamentals to engineering optimization
Creators: name: Kruger, N
name: Kurtulik, M
name: Revivo, N
name: Manor, A
name: Sabapathy, T
name: Rotschild, C
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The radiance of thermal emission, as described by Planck law, depends only on the emissivity and temperature of a body, and increases monotonically with the temperature rise at any emitted wavelength. Nonthermal radiation, such as photoluminescence, is a fundamental light matter interaction that conventionally involves the absorption of an energetic photon, thermalization, and the emission of a redshifted photon. Such a quantum process is governed by rate conservation, which is contingent on the quantum efficiency. In the past, the role of rate conservation for significant thermal excitation had not been studied. Recently, we presented the theory and an experimental demonstration that showed, in contrast to thermal emission, that the PL rate is conserved when the temperature increases while each photon is blueshifted. A further rise in temperature leads to an abrupt transition to thermal emission where the photon rate increases sharply. We also demonstrated how such thermally enhanced PL, TEPL, generates orders of magnitude more energetic photons than thermal emission at similar temperatures. These findings show that TEPL is an ideal optical heat pump that can harvest thermal losses in photovoltaics with a maximal theoretical efficiency of 70%, and practical concepts potentially reaching 45% efficiency. Here we move the TEPL concept onto the engineering level and present Cr:Nd:YAG as device grade PL material, absorbing solar radiation up to 1 micrometer wavelength and heated by thermalization of energetic photons. Its blueshifted emission, which can match GaAs cells, is 20% of the absorbed power. Based on a detailed balance simulation, such a material coupled with proper photonic management can reach 34% power conversion efficiency. These results raise confidence in the potential of TEPL becoming a disruptive technology in photovoltaics.
Οι αλληγορικές προσωποποιήσεις στις μεταμορφώσεις του Οβιδίου
Creators: name: Χειμωνίδου, Ευαγγελία Σταύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Αλληγορία
Προσωποποίηση
Invidia
Fames
Fama
Somnus
Allegory
Personification

description: Το κείμενο των Μεταμορφώσεων διανθίζεται με τέσσερις αλληγορικές προσωποποιήσεις: Η Invidia (2. 760-832), η Fames (8.782-822), ο Somnus (11. 583-656) και η Fama (12. 39-63), προσωποποιημένες μορφές, εντάσσονται σε εκτενή επεισόδια, διαδραματίζοντας σπουδαίο ρόλο μέσα σε αυτά. Η περιγραφή τόσο των ιδίων, όσο και των κατοικιών τους, καταλαμβάνει αρκετούς στίχους και προσδίδεται ιδιαίτερη έμφαση σε αυτές, εξαιτίας της βαρύνουσας σημασίας τους ως προς την εξέλιξη της δράσης και της πολυεπίπεδης λειτουργίας τους. Ο Οβίδιος κατορθώνει να αξιοποιήσει δημιουργικά τις διάσπαρτες λογοτεχνικές αναφορές ελληνικών και λατινικών κειμένων και να δημιουργήσει ολοκληρωμένες μορφές, σαφώς προσδιορισμένες ως προς τα εξωτερικά χαρακτηριστικά τους – με εξαίρεση τη Fama – και ως προς τις ιδιότητές τους. Οι πηγές του Οβιδίου, η οβιδιακή περιγραφή των τεσσάρων αλληγορικών μορφών και η λειτουργία τους μέσα στα επεισόδια στα οποία εντάσσονται, αποτελούν αντικείμενο μελέτης της προκείμενης εργασίας, η οποία φιλοδοξεί να αναδείξει τη σπουδαιότητά τους, αλλά και το ιδιαίτερο ταλέντο του ποιητή που τις φιλοτέχνησε.
description: The text of the Metamorphoses is adorned with four allegorical personifications: Invidia (2. 760-832), Fames (8.782-822), Somnus (11. 583-656) and Fama (12. 39-63), personified figures, are enrolled in lengthy episodes, playing an important role in them. The description of themselves, as well as their abodes, occupies plenty of verses and much emphasis is placed on them, due to their utmost importance concerning the course of action and their multilevel function. Ovid achieves to creatively use the scattered literary references of Greek and Latin texts and create complete figures, explicitly defined concerning their external features – with the exception of Fama – and their qualities. Ovid’s sources, the ovidian description of the four allegorical figures and their function in the episodes, in which they are included, constitute the object of the present paper, which aspires to outline their significance, as well as the special talent of poet that created them.
Models and characterizations of 1-way quantum finite automata
Creators: name: Brodsky, Alexander
Publisher: name: University of British Columbia
Year: 2009

description: In the past year two different models of quantum finite automata have been proposed. The first model, introduced by Moore and Crutchfield[MC98], makes one measurement on its state at the end of its computation and is called a measure-once quantum finite automata. The second model, introduced by Kondacs and Watrous[KW97], makes a measurement of its state after every transition and is called a measure-many quantum finite automata. In this thesis we investigate the characteristics of the two models. We characterize measure-once quantum finite automata when they are restricted to acceptance with bounded error, and we show that, when they are not so restricted, they can solve the word problem over the free group. We show that they can be simulated by probabilistic finite automata, which implies that they are no more powerful than probabilistic finite automata. We also describe an algorithm that determines if two automata are equivalent. We show that the class of languages accepted by measure-many quantum finite automata is closed under quotient, complement, and inverse homomorphisms. We prove a necessary condition for a language to be accepted by a measure-many automaton with bounded error and we show that certain sets, including piecewise testable sets, can be accepted with bounded error by this automata.
Η καλαθοσφαίριση στον κόσμο και την Ελλάδα στην εποχή της παγκοσμιοποίησης
Creators: name: Παπαδόπουλος, Αβραάμ Μιλτιάδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Παγκοσμιοποίηση
Καλαθοσφαίριση
Ευρωλίγκα
ΝΒΑ
Υπόθεση Μπόσμαν
Μάικλ Τζόρνταν
Globalization
Basketball
Euroleague
NBA
Bosman case
Michael Jordan

description: Ο σκοπός της παρούσας διατριβής είναι να καταγραφεί η θέση της καλαθοσφαίρισης στο ευρύτερο πλαίσιο της παγκοσμιοποίησης δίνοντας ιδιαίτερη βαρύτητα στην περίπτωση της ελληνικής πραγματικότητας. Στο πρώτο κεφάλαιο αναλύεται η «υπόθεση Μπόσμαν» και η επανάσταση που προήλθε μέσω αυτής στον ευρωπαϊκό αθλητισμό. Στη συνέχεια εξετάζεται το επαγγελματικό πρωτάθλημα των ΗΠΑ, το ΝΒΑ, που πρωταγωνιστεί σε όλες τις εξελίξεις που αφορούν το άθλημα της καλαθοσφαίρισης. Έπειτα, γίνεται ιδιαίτερη αναφορά στον κορυφαίο καλαθοσφαιριστή Μάικλ Τζόρνταν και τις αλλαγές που επέφερε στην καλαθοσφαίριση παγκοσμίως. Στο επόμενο κεφάλαιο παρουσιάζεται η εθνική ομάδα των ΗΠΑ των Ολυμπιακών αγώνων του 1992 (dream team). Ακόμη, γίνεται ανάλυση του ευρωπαϊκού μπάσκετ, της ευρωλίγκα και της εξέλιξης της στο χρόνο. Τέλος, γίνεται αναφορά στην προώθηση της καλαθοσφαίρισης από την τηλεόραση και τον κινηματογράφο.
description: The aim of this thesis was to examine the place of basketball in the wide surround of globalization, giving particular emphasis on the Greek case . The "Bosman case" and the revolution that came after this in the European athletics is analyzed in the first chapter. The analysis continues with the professional league of the USA, known as NBA, leading every development around basketball. There is a special reference to the top basketball player, Michael Jordan, and the changes that he brought to basketball worldwide. The next chapter is about the national team of the USA in the Olympic Games of 1992 (dream team) and also about the European basketball (Euroleague) and it’s development through time. Finally, there is a reference to the promotion of basketball through movies and television.
Μελέτη νημάτων βολφραμίου σε λαμπτήρες πυράκτωσης με ηλεκτρικές μετρήσεις
Creators: name: Αλμπάνης, Αλέξανδρος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Ηλεκτρικές μετρήσεις
Λαμπτήρες πυράκτωσης
Νήματα βολφραμίου
Νανοφυσαλίδες
Υστέρηση
Flectiral measurements
Incadensent lamps
Tungsten filaments
Nanobubbles
Ysterisis

description: Στην εργασία αυτή μελετούμε νήματα βολφραμίου σε λαμπτήρες πυράκτωσης με ηλεκτρικές μετρήσεις. Επιβεβαιώνουμε δεδομένα της βιβλιογραφίας και προσθέτουμε ένα νέο επιστημονικό στοιχείο που συσχετίζεται με την περιοχή της νανοφυσικής και νανοτεχνολογίας. Το νέο αυτό στοιχείο είναι η εμφάνιση νανοφυσαλίδων με την έναρξη θέρμανσης του νήματος. Μετά τη γέννεση και αύξηση του μεγέθους των νανοφυσαλίδων, όπου τα φαινόμενα αποτυπώνονται ιδιαίτερα έντονα στις ηλεκτρικές μετρήσεις, αρχίζει να φωτοβολεί το νήμα του λαμπτήρα. Ωστόσο και στην επόμενη περιοχή της φωτεινής ακτινοβολίας έχουμε δευτερεύουσες επιδράσεις από τις νανοφυσαλίδες. Σαν αποτέλεσμα της δευτερεύουσας αυτής επίδρασης έχουμε την απόκλιση του νόμου P~Rx, όπου x=4, με τιμές του x στην περιοχή 3 έως 4, ανάλογα με την ποιότητα του νήματος για λαμπτήρες πυράκτωσης. Αν αφαιρέσουμε την επίδραση των νανοφυσαλίδων (ανάμεσα στους κρυστάλλους W) στις ηλεκτρικές μετρήσεις τότε το x παίρνει την ιδανική τιμή 4. Αυτό γίνεται αν αντί της φαινόμενης αντίστασης R θέσουμε το πραγματικό μέρος (Ζreal) της μιγαδικής αντίστασης Z. Αν, από τη άλλη, μελετήσουμε τις συνθήκες παρασκευής του νήματος, τότε θα έχουμε ένα νέο εργαλείο για τη βελτίωση της φωτεινής απόδοσης των λαμπτήρων πυράκτωσης νέας τεχνολογίας που, ενδεχόμενως, έχουν και φωτονικές ιδιότητες.
description: At this work we study tungsten filaments of incandescent lamps with electrical measurements. We verify common bibliographic data and we add a new scientific element that is correlated with the new era of nanophysics and nanotechnology. This new element is the appearance of intergranural nanobubbles upon Joule effects in filament. After the growth and the increase in size of nanobubbles , where the electrical data are strongly affected, follows the glowing of filament. However, in the next power region of intense glowing, we have some secondary effects from nanobubbles. As a result, we have an apparent departure from the low P~Rx, where x=4, having experimental values of x in the area 3 to 4, depending on the manufacturing quality of the filament. If we use a model circuit, we may discriminate the nanobubbles effect in electrical measurements and then x takes the ideal value of 4. This can be done, if we replace the apparent resistance R with the real part (Ζreal) of the impedance Z. On the other hand, if we study the manufacturing conditions, then we may have a new tool towards to a luminous efficiency increase opening a new field into the science and technology of incandescent lamp, having possible photonic properties.
Vision-Based Layout Detection from Scientific Literature using Recurrent Convolutional Neural Networks
Creators: name: Yang, Huichen
name: Hsu, William H.
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
subject: I.2.6; I.2.10; I.4.9; I.5.1; I.5.4

description: We present an approach for adapting convolutional neural networks for object recognition and classification to scientific literature layout detection (SLLD), a shared subtask of several information extraction problems. Scientific publications contain multiple types of information sought by researchers in various disciplines, organized into an abstract, bibliography, and sections documenting related work, experimental methods, and results; however, there is no effective way to extract this information due to their diverse layout. In this paper, we present a novel approach to developing an end-to-end learning framework to segment and classify major regions of a scientific document. We consider scientific document layout analysis as an object detection task over digital images, without any additional text features that need to be added into the network during the training process. Our technical objective is to implement transfer learning via fine-tuning of pre-trained networks and thereby demonstrate that this deep learning architecture is suitable for tasks that lack very large document corpora for training ab initio. As part of the experimental test bed for empirical evaluation of this approach, we created a merged multi-corpus data set for scientific publication layout detection tasks. Our results show good improvement with fine-tuning of a pre-trained base network using this merged data set, compared to the baseline convolutional neural network architecture.
description: 8 pages
Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
Creators: name: Helton, J. S.
name: Matan, K.
name: Shores, M. P.
name: Nytko, E. A.
name: Bartlett, B. M.
name: Yoshida, Y.
name: Takano, Y.
name: Suslov, A.
name: Qiu, Y.
name: Chung, J. -H.
name: Nocera, D. G.
name: Lee, Y. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagome lattice antiferromagnet Zn Cu_3 (OH)_6 Cl_2. The susceptibility indicates a Curie-Weiss temperature of ~ -300 K; however, no magnetic order is observed down to 50 mK. Inelastic neutron scattering reveals a spectrum of low energy spin excitations with no observable gap down to 0.1 meV. The specific heat at low-T follows a power law with exponent less than or equal to 1. These results suggest that an unusual spin-liquid state with essentially gapless excitations is realized in this kagome lattice system.
description: 4 pages, 3 figures; v2: Updates to authors list and references; v3: Updated version; v4: Published version
Bridging the Planet Radius Valley: Stellar Clustering as a Key Driver for Turning Sub-Neptunes into Super-Earths
Creators: name: Kruijssen, J. M. Diederik
name: Longmore, Steven N.
name: Chevance, Mélanie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Extrasolar planets with sizes between that of the Earth and Neptune ($R_{\rm p}=1{-}4~{\rm R}_\oplus$) have a bimodal radius distribution. This 'planet radius valley' separates compact, rocky super-Earths ($R_{\rm p}=1.0{-}1.8~{\rm R}_\oplus$) from larger sub-Neptunes ($R_{\rm p}=1.8{-}3.5~{\rm R}_\oplus$) hosting a gaseous hydrogen-helium envelope around their rocky core. Various hypotheses for this radius valley have been put forward, which all rely on physics internal to the planetary system: photoevaporation by the host star, long-term mass loss driven by the cooling planetary core, or the transition between two fundamentally different planet formation modes as gas is lost from the protoplanetary disc. Here we report the discovery that the planet radius distribution exhibits a strong dependence on ambient stellar clustering, characterised by measuring the position-velocity phase space density with \textit{Gaia}. When dividing the planet sample into 'field' and 'overdensity' sub-samples, we find that planetary systems in the field exhibit a statistically significant ($p=5.5\times10^{-3}$) dearth of planets below the radius valley compared to systems in phase space overdensities. This implies that the large-scale stellar environment of a planetary system is a key factor setting the planet radius distribution. We discuss how models for the radius valley might be revised following our findings and conclude that a multi-scale, multi-physics scenario is needed, connecting planet formation and evolution, star and stellar cluster formation, and galaxy evolution.
description: 8 pages, 3 figures, 1 table; ApJ Letters in press (accepted 2020 November 22; revised 2020 November 19; received 2020 October 22)
Elicitation of cutting and breaking verbs
Creators: name: Parker, Verdena
name: Demitrescu, Suzi
name: Escamilla, Ramón
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-080809-04: Elicitation of cutting and breaking verbs, including metaphorical extensions.
A highly efficient and accurate exponential semi-implicit scalar auxiliary variable (ESI-SAV) approach for dissipative system
Creators: name: Liu, Zhengguang
name: Li, Xiaoli
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The scalar auxiliary variable (SAV) approach is a very popular and efficient method to simulate various phase field models. To save the computational cost, a new SAV approach is given by introducing a new variable $θ$. The new SAV approach can be proved to save nearly half CPU time of the original SAV approach while keeping all its other advantages. In this paper, we propose a novel technique to construct an exponential semi-implicit scalar auxiliary variable (ESI-SAV) approach without introducing any extra variables. The new proposed method also only needs to solve one linear equation with constant coefficients at each time step. Furthermore, the constructed ESI-SAV method does not need the bounded below restriction of nonlinear free energy potential which is more reasonable and effective for various phase field models. Meanwhile it is easy to construct first-order, second-order and higher-order unconditionally energy stable time-stepping schemes. Other than that, the ESI-SAV approach can be proved to be effective to solve the non-gradient but dissipative system such as Navier-Stokes equations. Several numerical examples are provided to demonstrate the improved efficiency and accuracy of the proposed method.
description: arXiv admin note: text overlap with arXiv:1912.09263, arXiv:2001.00812
Effective Action of Vacuum: Semiclassical Approach
Creators: name: Shapiro, Ilya L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present brief, to great extent pedagogical review on renormalization in curved space-time and of some recent results on the derivation and better understanding of quantum corrections to the action of gravity. The paper is mainly devoted to the semiclassical approach, but we also discuss its importance for quantum gravity and string theory.
description: 54 pages, 2 figures, invited review paper partially based on various lecture courses, accepted in Classical and Quantum Gravity as topical review. A few changes compared to the original version: some relevant comments on black hole case and references added, typos corrected
The Sasaki Cone and Extremal Sasakian Metrics
Creators: name: Boyer, Charles P.
name: Galicki, Krzysztof
name: Simanca, Santiago R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25

description: We study the Sasaki cone of a CR structure of Sasaki type on a given closed manifold. We introduce an energy functional over the cone, and use its critical points to single out the strongly extremal Reeb vectors fields. Should one such vector field be a member of the extremal set, the scalar curvature of a Sasaki extremal metric representing it would have the smallest $L^2$-norm among all Sasakian metrics of fixed volume that can represent vector fields in the cone. We use links of isolated hypersurface singularities to produce examples of manifolds of Sasaki type, many of these in dimension five, whose Sasaki cone coincides with the extremal set, and examples where the extremal set is empty. We end up by proving that a conjecture of Orlik concerning the torsion of the homology groups of these links holds in the five dimensional case.
description: 24 pages, to appear in the Proceedings of the Conference on Riemannian Topology, K. Galicki and S.R. Simanca Eds., Birkhauser, Boston
Using multi-element comparisons to discriminate between natural and anthropogenic post-depositional additions in estuarine sediments
Creators: name: Beavis, Fern Riva
Publisher: name: The Australian National University
Year: 2011
Subjects: subject: TD321.N4 B43 2011
subject: Water Pollution Environmental aspects Australia New South Wales
subject: Estuarine pollution Australia New South Wales
subject: Sedimentation and deposition Australia New South Wales

description: In most areas of the world, high population centres and heavy industry are located along river systems and provide a catchment wide source of heavy metal pollution along the length of the river system. These anthropogenically derived heavy metal pollutants enter the freshwater river systems and are transported downstream as part of the suspended sediment load. Such metals combine with the suspended sediment such that there is a higher concentration of heavy metals with the finer grained, clay-rich component of the transported sediment. In such cases, the ultimate depositional environment of contaminated sediments bears little relation to the distant source regions of anthropogenic pollution. In an arid country like Australia, there are numerous coastal estuaries that are supplied with sediment transported down catchments that lack both industry and significant population centres. However such coastal estuaries are undergoing rapid population growth, even though in such regions the upstream catchment is notably lacking in population centres and industry. This provides an opportunity to study heavy metal additions and contamination in a post-depositional estuarine saline environment, in which relatively uncontaminated freshwater sediments are input into the system, mainly during seasonal flood events. This study demonstrates that transported sediments, derived from upcatchment, undergo post depositional transformations across the freshwater-marine boundary. As a result of these terrigenous, biogenic, authigenic and anthropogenic changes, estuarine sediments do not necessarily reflect the original source composition. Conservative elements, especially rare earth elements, were used to differentiate between original and post-depositional additions and transformations to the sediments of an estuarine system on the south coast of New South Wales, Australia, to show that metal contamination does not correlate wholly with sediment grain size, but also correlates with proximity to local townships surrounding part of an estuary. Metals such as Pb have been discriminated in terms of original, transported sediment compositions and local pollutant sources. Furthermore, analyses of baseline, spatial and temporal data has generated a methodology and conceptual framework for assessing anomalies, even when concentrations are low within apparently 'pristine' settings. This thesis identifies both natural and anthropogenic processes and contributions to estuarine sediments, and presents a methodology by which metal contamination of sediments and the potential future risks from remobilisation can be quantified.
Disorder-related characteristics associated with interest in genetic testing for psychological disorders
Creators: name: Smith, HK
Publisher: name: University of Tasmania
Year: 2024

description: Genetic testing for psychological disorders is becoming increasingly accessible and popular. Understanding factors that predict interest in genetic testing allows healthcare providers to deliver personalised medicine and informs health campaigns. The present study had three hypotheses: 1. participants will perceive depression as significantly more preventable and treatable and significantly less severe, heritable, and shorter in duration compared to schizophrenia; 2. perceptions of greater preventability and treatability, and shorter duration will significantly predict interest in genetic testing for depression; 3. perceptions of greater heritability and severity will significantly predict interest in genetic testing for schizophrenia. A total of 229 adult participants (mean age=28.25 years, female N=16, male N=55, non-binary N=4, other N=1) completed an online survey regarding their perceptions of depression and schizophrenia, genetic knowledge and determinism, and interest in genetic testing. T-tests revealed that there was a significant difference in participants' perceptions of depression and schizophrenia. Logistic regressions revealed that perceptions of preventability, severity and the cyclical nature were significant predictors of interest in genetic testing for depression. None of the predictors were significant for predicting interest in genetic testing for schizophrenia. These results demonstrate a need for further research in the ambiguous field of genetic testing for psychological disorders.
Μελέτη της θαλάσσιας αύρας στην ευρύτερη περιοχή της Θεσσαλονίκης με τη χρήση αριθμητικού μοντέλου μέσης κλίμακας:
Creators: name: Κοντογιάννη, Παρασκευή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Θαλάσσια αύρα
Θεσσαλονίκη
Ρεύμα επιστροφής
Υψος κυττάρου
Σύγκλιση
MMS
Sea breeze
Thessaloniki
Return current
Vertical extend
Convergence zones

description: Μελετήθηκαν τα χαρακτηριστικά ανάπτυξης της κυκλοφορίας της θαλάσσιας αυρας στην περιοχή του Θερμαϊκού κόλπου της Θεσσαλονίκης με τη βοήθεια του αριθμητικού μοτνέλου μέσης κλίμακας MMS. Χαρακτηριστική είναι η ώρα έναρξης και λήξης της κυκλοφορίας της θαλάσσιας αύρας καθώς και η περιοχή στην οποία εκτείνεται, τόσο στο Θερμαϊκό όσο και στον ηπειρωτικό χώρο, όπου και εισχωρεί. Μελετάται το ύψος του κυττάρου, η χωροχρονική μεταβολή των περιοχών σύγκλισης και εντοπίζεται το ρεύμα επιστροφής.
description: The characteristics of the evaluation of the sea breeze circulation are studied over the major area of Thessaloniki, by using the mesoscale numerical model MMS> The initiation and termination time of the sea breeze ceel, and the inland penetration of it, were deptiched. The horizontal and verticale extent of sea breeze circulation cells were encountered, and the spatial and time spread of the convergence zones and the return flow were demonstrated.
The impact of Solar wind variability on pulsar timing
Creators: name: Tiburzi, C.
name: Shaifullah, G. M.
name: Bassa, C. G.
name: Zucca, P.
name: Verbiest, J. P. W.
name: Porayko, N. K.
name: van der Wateren, E.
name: Fallows, R. A.
name: Main, R. A.
name: Janssen, G. H.
name: Anderson, J. M.
name: Nielsen, A-. S. Bak
name: Donner, J. Y.
name: Keane, E. F.
name: Künsemöller, J.
name: Osłowski, S.
name: Grießmeier, J-. M.
name: Serylak, M.
name: Brüggen, M.
name: Ciardi, B.
name: Dettmar, R. -J.
name: Hoeft, M.
name: Kramer, M.
name: Mann, G.
name: Vocks, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: High-precision pulsar timing requires accurate corrections for dispersive delays of radio waves, parametrized by the dispersion measure (DM), particularly if these delays are variable in time. In a previous paper we studied the Solar-wind (SW) models used in pulsar timing to mitigate the excess of DM annually induced by the SW, and found these to be insufficient for high-precision pulsar timing. Here we analyze additional pulsar datasets to further investigate which aspects of the SW models currently used in pulsar timing can be readily improved, and at what levels of timing precision SW mitigation is possible. Our goals are to verify: a) whether the data are better described by a spherical model of the SW with a time-variable amplitude rather than a time-invariant one as suggested in literature, b) whether a temporal trend of such a model's amplitudes can be detected. We use the pulsar-timing technique on low-frequency pulsar observations to estimate the DM and quantify how this value changes as the Earth moves around the Sun. Specifically, we monitor the DM in weekly to monthly observations of 14 pulsars taken with LOFAR across time spans of up to 6 years. We develop an informed algorithm to separate the interstellar variations in DM from those caused by the SW and demonstrate the functionality of this algorithm with extensive simulations. Assuming a spherically symmetric model for the SW density, we derive the amplitude of this model for each year of observations. We show that a spherical model with time-variable amplitude models the observations better than a spherical model with constant amplitude, but that both approaches leave significant SW induced delays uncorrected in a number of pulsars in the sample. The amplitude of the spherical model is found to be variable in time, as opposed to what has been previously suggested.
description: 14 pages, 9 figures. Accepted for publication in Astronomy and Astrophysics
A constraint-based approach to real-time cooperative multiagent systems: a soccer-playing robot team
Creators: name: Zhang, Yu
Publisher: name: University of British Columbia
Year: 2009

description: It is not an easy task for a team of multiple fast-moving robots to cooperate with each other and try to beat another team in a dynamic, real-time environment. In order for a robot team to successfully play a soccer game, various technologies have to be incorporated including: robotic architectures, multi-agent collaboration and real-time reasoning. A robot is an integrated system, with a controller embedded in its plant. A robotic system is the coupling of a robot to its environment. Robotic systems are, in general, hybrid dynamic systems, consisting of continuous, discrete and event-driven components. Constraint Nets (CN) provide a semantic model for modeling hybrid dynamic systems. Controllers can be embedded constraint solvers that solve constraints in real-time. The controller for the robot soccer team player, UBC Dynamo98, has been modeled in Constraint Nets and implemented in Java. The various multi-agent collaborations have been treated as a part of the set of constraints which the controller solves in real-time. A coach program using an evolutionary algorithm has also been designed and implemented to adjust the weights of the constraints and other parameters in the controller. The results of the soccer tournament suggest that the formal Constraint Net approach is a practical tool for designing and implementing controllers for robots in multi-agent real-time environments. They also demonstrate the effectiveness of applying the evolutionary algorithm to the CN modeled controllers.
A structural investigation of mechanism in human glutathione transferase omega 1
Creators: name: Brock, Joseph Sydney
Publisher: name: The Australian National University
Year: 2011
Subjects: subject: QP606.G59 B76 2011
subject: Glutathione transferase
subject: Catalysis

description: This thesis investigates the structural details of catalysis associated with the human enzyme, Glutathione Transferase Omega 1 (hGSTO1-1), a member of the most recently discovered class of Glutathione Transferase. The human genome contains two Omega class genes (hGSTO1 and 2) and their transcribed products have been found at varied levels within almost every tissue of the human body. The crystal structure of hGSTO1-1 displays a distinguishing cysteine residue in the active site, a feature that undoubtedly plays a role in the novel biochemistry it displays. Of most interest is the hGSTO1-1 mediated reduction of mono-and dimethylated arsenic species that result from human arsenic exposure. The enzyme is also essential for the enzymatic detoxification of alphahaloketones to acetophenones and exhibits a novel dehydroascorbate reductase activity. The following dissertation reports major progress in understanding the details of these chemical mechanisms. By observing these reactions within the crystallised enzyme using X-ray diffraction, several states within these catalytic cycles have been observed in great detail. Subsequently, hypotheses have been drawn about the product inhibition inferred during dehydroascorbate reduction, the existence of glutathione intermediates inherent to its interaction with methylated arsenicals, and the fundamental understanding of Omega mediated catalysis obtained by observing the enzymatic complex of oxidized glutathione and S-(4-Nitrophenacyl) glutathione simultaneously. In addition, adaptation of experimental conditions has led to the discovery of two new crystal forms with which to study the structural dynamics of this protein and its chemistry. The structure of a naturally occurring polymorphism involving the deletion of glutamate 155 has also been solved, revealing pronounced structural plasticity that correlates well with the apparent instability of the mutant enzyme in vivo. Discussions explore the broad implications for interpreting the role of hGSTO1-1 in the pathomechanisms of human disease states such as Alzheimer's disease and the biological mechanisms of arsenics' newly discovered potential as an anti-cancer agent.
Effects of precession versus instabilities on the jets of GRS 1758-258
Creators: name: Luque-Escamilla, Pedro L.
name: Martí, Josep
name: Martínez-Aroza, José
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: Aims. The prototypical microquasar GRS 1758-258 exhibits large-scale morphological changes in radio maps over time which have been attributed to the rise of instabilities. Here, we investigate whether these effects could be attributed to jet precession instead. Methods.We used new and archival radio maps to fit a kinematic jet precession model. The value of the parameters thus obtained were analysed in order to get constraints on the physical properties of the GRS 1758-258 system. Their consistency with different theories of the origins for the jet precession, such as Lense-Thirring effect and tidal torques induced by the secondary star, has previously been studied. Alternatively, we also assessed the possibility that observations are compatible with eventual jet instabilities. Results. The new radio data presented here confirm that the large-scale radio morphology of GRS 1758-258 is changing over time. Our study shows that the 18.48 day period could plausibly be ascribed to precession, thus implying a reinterpretation of assumptions made for the orbital period to date. However, the observed structural changes in radio jets cannot be easily attributed to jet precession according to our analysis. In contrast, the growth of instabilities certainly appears to be a more realistic explanation of these effects.
description: Accepted for publication in Astronomy and Astrophysics
MPEC 2024-T198 : 2024 TK6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TK6

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
One loop scattering on D-branes
Creators: name: Park, I. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze one loop scattering amplitudes of the massless states on a stack of D3-branes. We use the vertex operators that have been obtained in the direct open string analysis developed in arXiv:0708.3452. The method does not have the obstacle of the D9 computation which is associated with the appearance of an $\e$-tensor. The divergence structure is not the same as the D9 brane case. What makes the analysis deviate from the D9 brane case is that the momenta of the states have non-zero components only along the brane directions. We ponder on the possibility that the one-loop divergence may be canceled by adding additional vertex operators at the tree level. We anticipate that they will be "exponentiated" to the free string action, with the resulting action to constitute a non-linear sigma model of the D-brane/AdS geometry.
description: 17 pages, 1 figure, refs added and adjusted, minor typos corrected, a version that will appear in EPJC
Το μάθημα της μουσικής στην ελληνική γενική δευτεροβάθμια εκπαίδευση σήμερα:
Creators: name: Κτενιαδάκη, Αθηνά Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Μουσική εκπαίδευση
Καθηγητές μουσικής
Δευτεροβάθμια εκπαίδευση
Music education
Music teachers
Secondary education

description: Η εργασία διαρθρώνεται σε δύο μέρη. Στο πρώτο, το θεωρητικό, διερευνώνται οι στόχοι, η μεθοδολογία, το περιεχόμενο και οι διδακτικές προσεγγίσεις του μαθήματος της Μουσικής στην Ελληνική Γενική Δευτεροβάθμια Εκπαίδευση, όπως προκύπτει μέσα από τη βιβλιογραφία και τα αναλυτικά προγράμματα του ΥΠ.Ε.Π.Θ. Στο δεύτερο μέρος, το εμπειρικό, διερευνώνται οι απόψεις, οι προσανατολισμοί και οι διδακτικές προσεγγίσεις των εν ενεργεία καθηγητών της Μουσικής στη χώρα μας, οι συνθήκες κάτω από τις οποίες διεξάγεται το έργο τους, καθώς επίσης και η εκπαίδευση, τα προσόντα και το επαγγελματικό τους προφίλ. Το δείγμα της έρευνας αποτέλεσαν 163 καθηγητές Μουσικής, που αντιστοιχούν στο 10,8% των πανελλαδικά εγγεγραμμένων καθηγητών Μουσικής της Β/θμιας Εκπαίδευσης κατά την έναρξη της συγκεκριμένης σχολικής χρονιάς (2006-07).
description: The present MA dissertation has two sections. The theoretical section includes the targets, the methodology, the content and the instructive approaches of music in Greek General Secondary Education, as it results from the literature review and the analytical programs of the Ministry of Education of Greece. The empirical section includes music teachers' beliefs and the instructive approaches that they apply, as well as the conditions that they encounter in school contexts. In addition, teachers answered questions conserning their musical education, their qualifications, and their professional identities. The participants in the present study were 163 music teachers, a sample that represents 10,8% of the total number of music teachers in Greek Secondary Education, in the school year 2006-2007.
The urban link : why global cities matter for global governance
Creators: name: Acuto, Michele
Publisher: name: The Australian National University
Year: 2011
Subjects: subject: HT330.A38 2011
subject: Metropolitan areas
subject: Globalization
subject: International organization

description: This thesis is about the importance of global cities for world politics. While there is a growing body of literature concerned with explaining the transformation of the international order, almost no theorization has taken into account the key metropolises of our time as elements of these revolutions. I seek to overcome this gap by demonstrating how global cities have a pervasive agency in contemporary global governance. They, I argue, are influential both in an 'actively passive' sense, recasting the geographies of local politics (their actant dimension) as well as in the more active ways of diplomacy and transnational networking (their actor dimension). Looking at global cities brings about three fundamental advantages on traditional IR paradigms. First, it facilitates a structurationist turn in IR towards more nuanced analyses of world politics. Second, it widens the horizon of the discipline through a multiscalar image of global governance. Third, it underscores how global cities have a strategic positioning when it comes to core contemporary challenges such as climate change. In order to illustrate this theoretical and practical influence, I rely on a structurationist framework (applied via actor-network theory) to identify global cities' agency in terms of their capacity to produce political structures that impact the geography of global governance. My empirical analysis is respectively dedicated to deconstructing their twin actant/actor dimensions, which I then reassemble in the conclusions. I begin by discussing the politics in global cities, looking at the 'glocal' policymaking processes of strategic urban planning (SUP) in London and Sydney. Then, focusing on the politics of global cities as actors, I analyze the Climate Leadership Group (C40) as a transnational network for metropolises such as London and Sydney to partake in global environmental governance. Overall, I argue, the production of global city-driven policy structures impacts global governance in that it charts new political geographies for collective and multiscalar action. Global cities, I demonstrate, can (and do) exercise a substantial influence in these realms. Yet, this agency remains centred on some key neoliberal continuities which global cities do not deny, if not uphold, therefore posing pivotal challenges that remind us not to take the geopolitical role of cities for granted. It is thus up to international scholars to engage in the analysis of these dynamics, while allowing for these metropolises to broaden the critical potential and multiscalar reach of the discipline. Global cities will certainly not wait.
von Sinner, Rudolf: Reden vom dreieinigen Gott in Brasilien und Indien
Creators: name: Vorster, Hans
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 53 Nr. 3 (2004): Ökumenische Rundschau, Band 53, Heft 3
A Cluster-Matching-Based Method for Video Face Recognition
Creators: name: Mendes, Paulo R C
name: Busson, Antonio J G
name: Colcher, Sérgio
name: Schwabe, Daniel
name: Guedes, Álan L V
name: Laufer, Carlos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Face recognition systems are present in many modern solutions and thousands of applications in our daily lives. However, current solutions are not easily scalable, especially when it comes to the addition of new targeted people. We propose a cluster-matching-based approach for face recognition in video. In our approach, we use unsupervised learning to cluster the faces present in both the dataset and targeted videos selected for face recognition. Moreover, we design a cluster matching heuristic to associate clusters in both sets that is also capable of identifying when a face belongs to a non-registered person. Our method has achieved a recall of 99.435% and a precision of 99.131% in the task of video face recognition. Besides performing face recognition, it can also be used to determine the video segments where each person is present.
description: 13 pages
Elicitation of vocabulary and phrases for phonetics and phonology
Creators: name: Parker, Verdena
name: Demitrescu, Suzi
name: Escamilla, Ramón
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio files VP-080809-02 and VP-080809-03: Elicitation of vocabulary and short phrases targeting phonetic and phonological phenomena.