cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Terahertz and infrared spectroscopic evidence of phonon-paramagnon coupling in hexagonal piezomagnetic YMnO3
Creators: name: Kadlec, C.
name: Goian, V.
name: Rushchanskii, K. Z.
name: Kuzel, P.
name: Lezaic, M.
name: Kohn, K.
name: Pisarev, R. V.
name: Kamba, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Terahertz and far-infrared electric and magnetic responses of hexagonal piezomagnetic YMnO3 single crystals are investigated. Antiferromagnetic resonance is observed in the spectra of magnetic permeability mu_a [H(omega) oriented within the hexagonal plane] below the Neel temperature T_N. This excitation softens from 41 to 32 cm-1 on heating and finally disappears above T_N. An additional weak and heavily-damped excitation is seen in the spectra of complex dielectric permittivity epsilon_c within the same frequency range. This excitation contributes to the dielectric spectra in both antiferromagnetic and paramagnetic phases. Its oscillator strength significantly increases on heating towards room temperature thus providing evidence of piezomagnetic or higher-order couplings to polar phonons. Other heavily-damped dielectric excitations are detected near 100 cm-1 in the paramagnetic phase in both epsilon_c and epsilon_a spectra and they exhibit similar temperature behavior. These excitations appearing in the frequency range of magnon branches well below polar phonons could remind electromagnons; however, their temperature dependence is quite different. We have used density functional theory for calculating phonon dispersion branches in the whole Brillouin zone. A detailed analysis of these results and of previously published magnon dispersion branches brought us to the conclusion that the observed absorption bands stem from phonon-phonon and phonon- paramagnon differential absorption processes. The latter is enabled by a strong short-range in-plane spin correlations in the paramagnetic phase.
description: subm. to PRB
Model structures and relative Gorenstein flat modules and chain complexes
Creators: name: Estrada, Sergio
name: Iacob, Alina
name: Pérez, Marco A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Category Theory (math.CT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 18G35, 18G55, 13D30, 16E65, 55U15

description: A recent result by J. Šaroch and J. Šťov\'ıček asserts that there is a unique abelian model structure on the category of left $R$-modules, for any associative ring $R$ with identity, whose (trivially) cofibrant and (trivially) fibrant objects are given by the classes of Gorenstein flat (resp., flat) and cotorsion (resp., Gorenstein cotorsion) modules. In this paper, we generalise this result to a certain relativisation of Gorenstein flat modules, which we call Gorenstein $\mathcal{B}$-flat modules, where $\mathcal{B}$ is a class of right $R$-modules. Using some of the techniques considered by Šaroch and Šťov\'ıček, plus some other arguments coming from model theory, we determine some conditions for $\mathcal{B}$ so that the class of Gorenstein $\mathcal{B}$-modules is closed under extensions. This will allow us to show approximation properties concerning these modules, and also to obtain a relative version of the model structure described before. Moreover, we also present and prove our results in the category of complexes of left $R$-modules, study other model structures on complexes constructed from relative Gorenstein flat modules, and compare these models via computing their homotopy categories.
description: 35 pages. Labeling now matches the published version. Further details have been added in the proofs of Propositions 2.15 and 2.18
Connecting Width and Structure in Knowledge Compilation (Extended Version)
Creators: name: Amarilli, Antoine
name: Monet, Mikaël
name: Senellart, Pierre
Publisher: name: arXiv
Year: 2017
Subjects: subject: Databases (cs.DB)
subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: Several query evaluation tasks can be done via knowledge compilation: the query result is compiled as a lineage circuit from which the answer can be determined. For such tasks, it is important to leverage some width parameters of the circuit, such as bounded treewidth or pathwidth, to convert the circuit to structured classes, e.g., deterministic structured NNFs (d-SDNNFs) or OBDDs. In this work, we show how to connect the width of circuits to the size of their structured representation, through upper and lower bounds. For the upper bound, we show how bounded-treewidth circuits can be converted to a d-SDNNF, in time linear in the circuit size. Our bound, unlike existing results, is constructive and only singly exponential in the treewidth. We show a related lower bound on monotone DNF or CNF formulas, assuming a constant bound on the arity (size of clauses) and degree (number of occurrences of each variable). Specifically, any d-SDNNF (resp., SDNNF) for such a DNF (resp., CNF) must be of exponential size in its treewidth; and the same holds for pathwidth when compiling to OBDDs. Our lower bounds, in contrast with most previous work, apply to any formula of this class, not just a well-chosen family. Hence, for our language of DNF and CNF, pathwidth and treewidth respectively characterize the efficiency of compiling to OBDDs and (d-)SDNNFs, that is, compilation is singly exponential in the width parameter. We conclude by applying our lower bound results to the task of query evaluation.
description: 33 pages, no figures, 40 references. This is the full version with proofs of the corresponding ICDT'18 publication, and it integrates all reviewer feedback. Except for the additional appendices, and except for formatting differences and inessential changes, the contents are the same as in the conference version. Fixed in version 4 a minor omission in the proof of Theorem 33 and small typos
Διερεύνηση των επαληθευτικών διαδικασιών μελλοντικών δασκάλων κατά την επίλυση προβλημάτων τόσο σε υπολογιστικό περιβάλλον όσο και στο συμβατικό περιβάλλον «χαρτί-μολύβι»
Creators: name: Μπορντένα, Ευγενία Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Επαλήθευση
Περιβάλλον «χαρτί-μολύβι»
Περιβάλλον του GeoGebra
Verification
"paper-pencil" environment
GeoGebra

description: Μολονότι το θέμα της επίλυσης προβλήματος έχει απασχολήσει ιδιαιτέρως την επιστημονική κοινότητα συγκεντρώνοντας έναν σημαντικό όγκο ερευνητικών εργασιών, εντούτοις ο αριθμός ερευνών που συνδέεται με το τελευταίο στάδιο της επίλυσης, αυτό της επαλήθευσης της λύσης, είναι μάλλον περιορισμένος. Η επαλήθευση αποτελεί αναπόσπαστο κομμάτι της επίλυσης προβλήματος δεδομένου ότι με τη διενέργεια επαληθευτικών διαδικασιών παρέχεται στον λύτη η δυνατότητα επιβεβαίωσης της ορθότητας του αποτελέσματός του. Η ενθάρρυνση της χρήσης επαληθευτικών διαδικασιών από τους μαθητές εγείρει τον προβληματισμό τους πάνω στον τρόπο επίλυσης που ακολούθησαν και μεθοδεύει τον έλεγχο τόσο του τελικού τους αποτελέσματος όσο και των βημάτων επίλυσης που ακολούθησαν. Προς αυτή την κατεύθυνση, σκοπός της παρούσας έρευνας είναι η διερεύνηση των επαληθευτικών διαδικασιών που χρησιμοποιούν οι φοιτητές του Παιδαγωγικού Τμήματος Δημοτικής Εκπαίδευσης-μελλοντικοί δάσκαλοι πρωτοβάθμιας εκπαίδευσης στο συμβατικό περιβάλλον «χαρτί-μολύβι» και στο περιβάλλον του GeoGebra. Ειδικότερα, η εργασία στοχεύει στην διερεύνηση των παρακάτω ερευνητικών ερωτημάτων: 1. Τι είδους στρατηγικές επαλήθευσης χρησιμοποιούν οι φοιτητές στα δύο περιβάλλοντα (περιβάλλον «χαρτί-μολύβι» και περιβάλλον του GeoGebra); 2. Σε τι βαθμό διαφοροποιούνται μεταξύ τους ανάλογα με το περιβάλλον στο οποίο εμφανίζονται;
description: Although the topic of problem solving has been of particular concern to the scientific community, gathering a significant amount of research work, the number of researches related to the last stage of the problem solving, that of verifying the solution, is rather limited. Verification is an integral part of problem solving since by performing verification procedures the solver is given the possibility to confirm the correctness of his result. Encouraging the use of verification procedures by students raises their reflection on the way of solving they followed and methods the control of both their final result and the steps of solving they followed. In this direction, the purpose of this research is to investigate the verification procedures used by students of the Pedagogy Department of Elementary Education-future primary school teachers in the conventional "paper-pencil" environment and in the computational environment (GeoGebra). In particular, the work aims to investigate the following research questions: 1. What kind of verification strategies do students use in both environments (pencil and paper environment and computational environment of GeoGebra)? 2. To what extent do they differ from each other depending on the environment in which appear?
Data Management Challenges In Astronomy And Astroparticle Physics
Creators: name: Lamanna, Giovanni
Publisher: name: Zenodo
Year: 2015
Subjects: Science data management

description: Astronomy and Astroparticle Physics domains are experiencing a deluge of data with the next generation of facilities prioritised in the European Strategy Forum on Research Infrastructures (ESFRI), such as SKA, CTA, KM3Net and with other world-class projects, namely LSST, EUCLID, EGO, etc. The new ASTERICS-H2020 project brings together the concerned scientific communities in Europe to work together to find common solutions to their Big Data challenges, their interoperability, and their data access. The presentation will highlight these new challenges and the work being undertaken also in cooperation with e-infrastructures in Europe.
Evaluation of Mm-based NiMH alloys for batteries
Creators: name: Milicevic, Dusan
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: TK7871.15 .N53 M55 1998
subject: Nickel alloys--Testing.
subject: Nickel-metal hydride batteries.
subject: Mischmetal.

description: Bibliography: p. 164-172
Esa Sky
Creators: name: Merin, Bruno
Publisher: name: Zenodo
Year: 2015
Subjects: Science data management

description: The ESAC Science Data Centre, ESDC, is working on a science-driven discovery portal for all its astronomy missions with the provisional name Multi-Mission Interface. The first public release of this service will be demonstrated, featuring an interface for sky exploration and for single and multiple target searches. It requires no prior knowledge of any of the missions involved. From a technical point of view, the system offers all-sky projections of full mission datasets using a new-generation HEALPix projection called HiPS; detailed geometrical footprints to access individual observations at the mission archives using VO-TAP queries; and direct access to the underlying mission-specific science archives.

A first public release is scheduled before the end of 2015 and will give users worldwide simplified access to high-level science-ready data products from all ESA Astronomy missions plus a number of ESA-produced source catalogues. A demo will accompany the presentation.
Evolutionary algorithms in genetic regulatory networks model
Creators: name: Raza, Khalid
name: Parveen, Rafat
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences
subject: http://bipublication.com/files/JABAR-V3I1-2012-06.pdf

description: Genetic Regulatory Networks (GRNs) plays a vital role in the understanding of complex biological processes. Modeling GRNs is significantly important in order to reveal fundamental cellular processes, examine gene functions and understanding their complex relationships. Understanding the interactions between genes gives rise to develop better method for drug discovery and diagnosis of the disease since many diseases are characterized by abnormal behaviour of the genes. In this paper we have reviewed various evolutionary algorithms-based approach for modeling GRNs and discussed various opportunities and challenges.
description: 10 pages, 3 figures and 1 table
Texture estimates of operational forestry parameters
Creators: name: Wiebe, Jonathan Andrew
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: SD387 .R4 W54 1998
subject: Forests and forestry - Remote sensing
subject: Synthetic aperture radar
subject: Image processing
subject: Remote sensing
subject: Aerial photography in forestry

description: Bibliography: p. 85-92
Etica pubblica e Bioetica del fine vita: riflessioni su un possibile confronto
Creators: name: De Panfilis, Ludivica
Publisher: name: Dipartimento di Scienze Giuridiche. Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: public ethics; bioethics; applied ethics, end of life care; autonomy

description: L’etica pubblica si occupa della giustificazione normativa delle decisioni delle pubbliche istituzioni e della deontologia professionale. In alcuni contesti tali accezioni di etica pubblica possono sovrapporsi e un esempio particolarmente efficace è quello riguardante la cura e i professionisti che operano in tale campo lavorano a contatto con i pazienti-utenti. In questo caso, infatti, questioni come quelle della distribuzione di diritti e risorse o lo sviluppo di un sistema sanitario il più possibile cost effective intrecciano problemi relativi alle scelte di cura e alla relazione medico-paziente – temi tradizionalmente affidati alla riflessione etica applicata e ad uno spazio “privato”. Una nozione ampia di bioetica non si risolve solo in una forma di etica applicata, ma ha dei risvolti pubblici. Il problema del fine vita è significativo per il tentativo di delineare una riflessione di etica pubblica in questo campo, esulando da una dimensione esclusivamente “privata”. Il morire e la morte necessitano di analisi teorica del significato che hanno assunto all’interno di uno spazio pubblico condizionato dalle innovazioni tecno-scientifiche. Il morire rappresenta non solo una questione di impatto fondamentale sulla sfera privata dei singoli, ma anche un insieme di problemi sociali e di politica pubblica, economici e giuridici.
description: Labour & Law Issues, Vol 1, N° 2 (2015)
Computational Social Scientist Beware: Simpson's Paradox in Behavioral Data
Creators: name: Lerman, Kristina
Publisher: name: arXiv
Year: 2017
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Observational data about human behavior is often heterogeneous, i.e., generated by subgroups within the population under study that vary in size and behavior. Heterogeneity predisposes analysis to Simpson's paradox, whereby the trends observed in data that has been aggregated over the entire population may be substantially different from those of the underlying subgroups. I illustrate Simpson's paradox with several examples coming from studies of online behavior and show that aggregate response leads to wrong conclusions about the underlying individual behavior. I then present a simple method to test whether Simpson's paradox is affecting results of analysis. The presence of Simpson's paradox in social data suggests that important behavioral differences exist within the population, and failure to take these differences into account can distort the studies' findings.
description: to appear in Journal of Computational Social Sciences
An improved Green's function algorithm applied to quantum transport in carbon nanotubes
Creators: name: Teichert, Fabian
name: Zienert, Andreas
name: Schuster, Jörg
name: Schreiber, Michael
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The renormalization-decimation algorithm (RDA) of López Sancho et al. is used in quantum transport theory to calculate bulk and surface Green's functions. We derive an improved version of the RDA for the case of very long quasi one-dimensional unit cells (in transport direction). This covers not only long unit cells but also supercell-like calculations for structures with disorder or defects. In such large systems, short-range interactions lead to sparse real-space Hamiltonian matrices. We show how this and a corresponding subdivision of the unit cell in combination with the decimation technique can be used to reduce the calculation time. Within the resulting algorithm, separate RDA calculations of much smaller effective Hamiltonian matrices must be done for each Green's function, which enables the treatment of systems too large for the common RDA. Finally, we discuss the performance properties of our improved algorithm as well as some exemplary results for chiral carbon nanotubes.
One-Click Data Analysis Software For Science Operations
Creators: name: Navarro, Vicente
Publisher: name: Zenodo
Year: 2015
Subjects: Science data management

description: ne of the important activities of ESA Science Operations Centre is to provide Data Analysis Software (DAS) to enable users and scientists to process data further to higher levels.

During operations and post-operations, Data Analysis Software (DAS) is fully maintained and updated for new OS and library releases. Nonetheless, once a Mission goes into the âlegacyâ phase, there are very limited funds and long-term preservation becomes more and more difficult.

Building on Virtual Machine (VM), Cloud computing and Software as a Service (SaaS) technologies, this project has aimed at providing long-term preservation of Data Analysis Software for the following missions:

	PIA for ISO (1995)
	SAS for XMM-Newton (1999)
	Hipe for Herschel (2009)
	EXIA for EXOSAT (1983)

Following goals have guided the architecture:

	Support for all operations, post-operations and archive/legacy phases.
	SSupport for local (userâs computer) and cloud environments (ESAC-Cloud, Amazon - AWS).
	SSupport for expert users, requiring full capabilities.
	SProvision of a simple web-based interface.

This talk describes the architecture, challenges, results and lessons learnt gathered in this project.
Networking technologies, NGO's and development: exploring new tools for change
Creators: name: Innes, Melissa Plaunt
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: Q175.54 .I66 1998
subject: Internet (Computer network)--Social aspects.
subject: Information services industry--Social aspects.
subject: Computer networks--Social aspects.
subject: Community development--Developing countries--Citizen participation.
subject: Communication--Social aspects--Developing countries.
subject: Information services--Social aspects--Developing countries.

description: Bibliography: p. 142-146
Dynamic Iterative Pursuit
Creators: name: Zachariah, Dave
name: Chatterjee, Saikat
name: Jansson, Magnus
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: For compressive sensing of dynamic sparse signals, we develop an iterative pursuit algorithm. A dynamic sparse signal process is characterized by varying sparsity patterns over time/space. For such signals, the developed algorithm is able to incorporate sequential predictions, thereby providing better compressive sensing recovery performance, but not at the cost of high complexity. Through experimental evaluations, we observe that the new algorithm exhibits a graceful degradation at deteriorating signal conditions while capable of yielding substantial performance gains as conditions improve.
description: 6 pages, 7 figures. Accepted for publication in IEEE Transactions on Signal Processing
Randomized reference models for temporal networks
Creators: name: Gauvin, Laetitia
name: Génois, Mathieu
name: Karsai, Márton
name: Kivelä, Mikko
name: Takaguchi, Taro
name: Valdano, Eugenio
name: Vestergaard, Christian L.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Discrete Mathematics (cs.DM)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Many dynamical systems can be successfully analyzed by representing them as networks. Empirically measured networks and dynamic processes that take place in these situations show heterogeneous, non-Markovian, and intrinsically correlated topologies and dynamics. This makes their analysis particularly challenging. Randomized reference models (RRMs) have emerged as a general and versatile toolbox for studying such systems. Defined as random networks with given features constrained to match those of an input (empirical) network, they may, for example, be used to identify important features of empirical networks and their effects on dynamical processes unfolding in the network. RRMs are typically implemented as procedures that reshuffle an empirical network, making them very generally applicable. However, the effects of most shuffling procedures on network features remain poorly understood, rendering their use nontrivial and susceptible to misinterpretation. Here we propose a unified framework for classifying and understanding microcanonical RRMs (MRRMs) that sample networks with uniform probability. Focusing on temporal networks, we survey applications of MRRMs found in the literature, and we use this framework to build a taxonomy of MRRMs that proposes a canonical naming convention, classifies them, and deduces their effects on a range of important network features. We furthermore show that certain classes of MRRMs may be applied in sequential composition to generate new MRRMs from the existing ones surveyed in this article. We finally provide a tutorial showing how to apply a series of MRRMs to analyze how different network features affect a dynamic process in an empirical temporal network.
description: Accepted version
Arithmetics in number systems with cubic base
Creators: name: Tinková, Magdaléna
Publisher: name: arXiv
Year: 2018
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: This paper focuses on greedy expansions, one possible representation of numbers, and on arithmetical operations with them. Performing addition or multiplication some additional digits can appear. We study bounds on the number of such digits assuming the finiteness of the expansion of the considered sum or product, especially for the case of cubic Pisot units.
Quality Assurance At The Vlt: Real-Time Assessment And Closed Loop
Creators: name: Mieske, Steffen
name: Wolff, Burkhard
Publisher: name: Zenodo
Year: 2015
Subjects: Science data management

description: We will present a summary of the procedures in place at the VLT to ensure in real-time the quality of scientific and calibration data taken during the night, to monitor completeness and validity of calibrations in general, and to close the feedback loop with all stakeholders involved.
Minimal knotted polygons in cubic lattices
Creators: name: van Rensburg, E. J. Janse
name: Rechnitzer, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Topology (math.GN)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: An implementation of BFACF-style algorithms on knotted polygons in the simple cubic, face centered cubic and body centered cubic lattice is used to estimate the statistics and writhe of minimal length knotted polygons in each of the lattices. Data are collected and analysed on minimal length knotted polygons, their entropy, and their lattice curvature and writhe.
A study of the understanding of our multicultural world as constructed by students in a private Christian school
Creators: name: Nicolai, Bernarda
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: LC1099.5 .C3 N53 1998
subject: Additional Copy: 370 EDC 1998 NIC in the Doucette Education Library
subject: Multicultural education--Canada.
subject: Church schools--Alberta--Social aspects.
subject: Multiculturalism - Canada

description: Bibliography: p. 182-189
Low power sessile droplet actuation via modulated surface acoustic waves
Creators: name: Baudoin, Michael
name: Brunet, Philippe
name: Matar, Olivier Bou
name: Herth, Etienne
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Low power actuation of sessile droplets is of primary interest for portable or hybrid lab-on-a-chip and harmless manipulation of biofluids. In this paper, we show that the acoustic power required to move or deform droplets via surface acoustic waves can be substantially reduced through the forcing of the drops inertio-capillary modes of vibrations. Indeed, harmonic, superharmonic and subharmonic (parametric) excitation of these modes are observed when the high frequency acoustic signal (19.5 MHz) is modulated around Rayleigh-Lamb inertio-capillary frequencies. This resonant behavior results in larger oscillations and quicker motion of the drops than in the non-modulated case.
Extended hard X-ray emission from the Vela pulsar wind nebula
Creators: name: Mattana, Fabio
name: Götz, Diego
name: Terrier, Régis
name: Bouchet, Laurent
name: Ponti, Gabriele
name: Falanga, Maurizio
name: Renaud, Matthieu
name: Caballero, Isabel
name: Soldi, Simona
name: Heras, Juan Antonio Zurita
name: Schanne, Stephane
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The nebula powered by the Vela pulsar is one of the best examples of an evolved pulsar wind nebula, allowing to access the particle injection history and the interaction with the supernova ejecta. We report on the INTEGRAL discovery of extended emission above 18 keV from the Vela nebula. The northern side has no known counterparts and it appears larger and more significant than the southern one, which is in turn partially coincident with the cocoon, the soft X-ray and TeV filament towards the center of the remnant. We also present the spectrum of the Vela nebula in the 18-400 keV energy range as measured by IBIS/ISGRI and SPI on board the INTEGRAL satellite. The apparent discrepancy between IBIS/ISGRI, SPI, and previous measurements is understood in terms of point spread function, supporting the hypothesis of a nebula more diffuse than previously thought. A break at ~25 keV is found in the spectrum within 6' from the pulsar after including the Suzaku XIS data. Interpreted as a cooling break, this points out that the inner nebula is composed by electrons injected in the last ~2000 years. Broad-band modeling also implies a magnetic field higher than 10 microGauss in this region. Finally, we discuss the nature of the northern emission, which might be due to fresh particles injected after the passage of the reverse shock.
description: 15 pages, 4 figures, accepted for publication in ApJ Letters
Delinquent peers: an empirical test of competing explanations
Creators: name: Pevalin, David James
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: HV9069 .P48 1998
subject: Juvenile delinquents
subject: Juvenile delinquency--Cause
subject: Juvenile delinquency--Methodology.

description: Bibliography: p. 84-92
Ο Εθισμός στο Διαδίκτυο σε παιδιά και εφήβους με Διαταραχή Ελλειμματικής Προσοχής - Υπερκινητικότητας (ΔΕΠΥ): Μία Βιβλιογραφική Ανασκόπηση
Creators: name: Μπάρμπα, Αικατερίνη Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Διαταραχή Ελλειμματικής Προσοχής – Υπερκινητικότητας (ΔΕΠ-Υ)
Εθισμός στο διαδίκτυο
Παιδική και Εφηβική ηλικία
Βιβλιογραφική ανασκόπηση
Attention Deficit Hyperactivity Disorder (ADHD)
Internet addiction
Children and Adolescents
Literature Review

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι να αποσαφηνιστεί η σχέση ανάμεσα στη διαταραχή του εθισμού στο διαδίκτυο σε παιδιά και εφήβους με συμπτωματολογία της Διαταραχής Ελλειμματικής Προσοχής - Υπερκινητικότητας. Πιο συγκεκριμένα, για την εξέταση του συγκεκριμένου θέματος και των επιμέρους στόχων ακολουθήθηκε η ανασκόπηση της βιβλιογραφίας σε τέσσερις ηλεκτρονικές βάσεις δεδομένων (PubMed, Scopus, Google Scholar και Science Direct), χρησιμοποιώντας λέξεις – κλειδιά, και με βάση τα κριτήρια ένταξης και αποκλεισμού των ερευνών, προέκυψαν προς περαιτέρω ανάλυση 29 έρευνες. Η διεθνής βιβλιογραφία, λοιπόν, ανέδειξε την επιρρέπεια των παιδιών και εφήβων με ΔΕΠ-Υ στην παθολογική χρήση του διαδικτύου, αλλά και τη σύνδεση της εντονότερης χρήσης του με σοβαρότερη συμπτωματολογία της ΔΕΠ-Υ. Παράλληλα, συχνότερη εντοπίστηκε να είναι η εμφάνιση στο αρσενικό φύλο, τα συμπτώματα απροσεξίας, το διαδικτυακό παιχνίδι ενώ σημαντικοί καταδεικνύονται οι οικογενειακοί παράγοντες. Εν κατακλείδι, είναι εμφανής η αλληλεπίδραση ανάμεσα στη ΔΕΠ-Υ και τον εθισμό στο διαδίκτυο. Τα αποτελέσματα μπορούν να αποτελέσουν τη βάση ώστε οι γονείς και οι επαγγελματίες υγείας να αναγνωρίζουν πρώιμα τα σημάδια και να μεριμνήσουν για τη κατάλληλη χρήση του διαδικτύου των παιδιών και εφήβων με ΔΕΠ-Υ, ενώ είναι δυνατό να συντελέσουν και στην ανάπτυξη προγραμμάτων και παρεμβάσεων.
description: The purpose of this diploma thesis is to clarify the relationship between Internet Addiction disorder in children and adolescents with symptoms of Attention Deficit Hyperactivity Disorder. More precisely, to examine the specific topic and the individual objectives, a literature review was followed in four online databases (PubMed, Scopus, Google Scholar and Science Direct), using keywords. Based on research inclusion and exclusion criteria, of those met the criteria and were further analyzed. Therefore, international literature highlighted susceptibility of children and adolescents with ADHD to pathological use of internet, but also the connection of its intense use with more severe symptoms of ADHD. In addition, pathological use was found to be predominantly in male gender, children and adolescents with symptoms of inattention, online gaming and finally family factors are shown to be important. In conclusion, the interaction between ADHD and internet addiction is apparent. The results could form the basis for parents and health professionals to recognize early signs and ensure the appropriate of the internet by children and adolescents with ADHD, while it is possible to contribute to the development of corresponding programs and interventions.
An approach to chaos in some mixed p-spin models
Creators: name: Chen, Wei-Kuo
name: Panchenko, Dmitry
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35, 82B44

description: We consider the problems of chaos in disorder and temperature for coupled copies of the mixed p-spin models. Under certain assumptions on the parameters of the models we will first prove a weak form of chaos by showing that the overlap is concentrated around its Gibbs average depending on the disorder and then obtain several results toward strong chaos by providing control of the overlap between two systems in terms of their Parisi measures.
description: 14 pages
Pionier:  From A Expert Mode To An Eso Facility Instrument
Creators: name: Percheron, Isabelle
Publisher: name: Zenodo
Year: 2015
Subjects: Science data management

description: The PIONIER (Precision Integrated-Optics Near-infrared Imaging ExpeRiment) at the VLT Interferometer instrument was originally a visitor instrument from IPAG (Institut de PlanÃ©tologie et dâAstrophysique de Grenoble). It is now offered to the ESO community as a facility instrument. As a Visitor monde instrument, it was operated on selected nights by the instrument team/consortium, the goal is now for the Paranal staff to run and monitor the instrument as any other VLT/VLTI instrument. This is done by fully integrating PIONIER in the ESO scheme. I will present here how this was done for the data reduction and the quality assurance of the science data and their related calibrations.
The Lesser Slave Lake Dune Ridge barrier complex, north central Alberta: depositional processes, paleogeography, and paleoclimate
Creators: name: Clack, Aaron G.
Publisher: name: University of Calgary
Year: 1998
Subjects: subject: GB428.5 .C3 C56 1998
subject: Sedimentation and deposition--Alberta--Lesser Slave Lake.
subject: Paleogeography--Alberta--Lesser Slave Lake.
subject: Paleoclimate--Alberta--Lesser Slave Lake.
subject: Lesser Slave Lake (Alta.)

description: Bibliography: p. 115-125
Χειρουργικές λοιμώξεις σε ασθενείς που έχουν υποβληθεί σε θυρεοειδεκτομή και επεμβάσεις τραχήλου
Creators: name: Δόντσιου, Ευαγγελία Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Θυρεοειδεκτομή
Λοιμώξεις χειρουργικού πεδίου
Επεμβάσεις τραχήλου
Thyroidectomy
Surgical Site Infections
Neck surgical procedures

description: Οι Λοιμώξεις Χειρουργικού Πεδίου (SSIs) αποτελούν μια σημαντική οντότητα στη Χειρουργική και αποτελούν το 20% των λοιμώξεων στην υγειονομική περίθαλψη έχοντας σημαντικές επιπτώσεις. Οι Λοιμώξεις Χειρουργικού Πεδίου που αφορούν επεμβάσεις θυρεοειδούς και τραχήλου είναι λιγότερο συχνές, αλλά υπαρκτές και εξίσου επικίνδυνες. Στην παρούσα μελέτη σκοπός είναι να αναλυθεί η χορήγηση περιεγχειρητικής χημειοπροφύλαξης σε τέτοιου είδους επεμβάσεις, πως επηρεάζει την έκβαση και αν το αποτέλεσμα διαφοροποιείται με την τοποθέτηση παροχέτευσης. Συγκεκριμένα, μελετήθηκαν είκοσι ασθενείς του Χειρουργικού Ογκολογικού Τμήματος του Αντικαρκινικού Νοσοκομείου Θεσσαλονίκης «Θεαγένειο», οι οποίοι διαχωρίσθηκαν σε δυο βασικές ομάδες ανάλογα με την προεγχειρητική χορήγηση αντιβιοτικής αγωγής και εν συνεχεία πραγματοποιήθηκε υποομαδοποίηση ανάλογα με την τοποθέτηση παροχέτευσης επί του χειρουργικού βόθρου. Στη συνέχεια έγινε στατιστική ανάλυση με χ2 τεστ ανεξαρτησίας και αξιολογήθηκαν τα αποτελέσματα.Διαπιστώθηκε ότι η εμφάνιση λοίμωξης χειρουργικού πεδίου είναι ανεξάρτητη της προφυλακτικής χορήγησης αντιβιοτικής αγωγής, καθώς και ανεξάρτητη της τοποθέτησης παροχέτευσης. Επομένως, η χρήση περιεγχειρητικής χημειοπροφύλαξης θα πρέπει να περιορίζεται σύμφωνα με τις διεθνείς κατευθυντήριες οδηγίες σε επεμβάσεις που κρίνεται απαραίτητη, σε ασθενείς υψηλότερου κινδύνου και, τέλος, όταν οι διεγχειρητικοί παράγοντες το απαιτούν.
description: Surgical Side Infections (SSIs) constitute of significant importance in the surgery field and accounts for 20% of infections in healthcare with significant impacts. SSIs which refer to thyroid and cervical procedures are less common but possible and equally dangerous. The aim of this study is to analyze the administration of preoperative antibiotic chemoprophylaxis in such operations, its effect on the outcome and whether the result is differentiated from the drain placement. Specifically, twenty (20) patients of the General Surgery Department of the Cancer Hospital of Thessaloniki “Theageneio” were studied, who were divided into two main groups depending on the preoperative administration of antibiotic treatment and then sub-grouped according to the drain’s placement. Following this, a statistical analysis was performed with x2 Test of Independence (Pearson Test), and the results were evaluated. Through the analysis, it was discovered that the occurrence of SSIs is independent of antibiotic chemoprophylaxis and additionally, independent of the drain’s placement. Consequentially, the use of perioperative chemoprophylaxis should be limited according to international guidelines to surgical operations which is deemed necessary, in higher risk patients and finally, when intraoperative factors require it.
Programming type-safe transformations using higher-order abstract syntax
Creators: name: Savary Belanger, Olivier
name: Monnier, Stefan
name: Pientka, Brigitte
Publisher: name: Alma Mater Studiorum - University of Bologna
Year: 2015
Subjects: Logical frameworks; Certified Programming; Type-preserving Compilation

description: When verifying that compiler phases preserve some property of the compiled program, a major difficulty resides in how to represent and manipulate variable bindings, often imposing extra complexity both on the compiler writer and the verification effort.

In this paper, we show how Beluga's dependent contextual types let us use higher-order abstract syntax (HOAS) to implement a type-preserving compiler for the simply-typed lambda-calculus, including transformations such as closure conversion and hoisting.  Unlike previous implementations, which have to abandon HOAS locally in favor of a first-order binder representation, we are able to take advantage of HOAS throughout the compiler pipeline, so that the compiler code stays clean and we do not need extra lemmas about binder manipulation.  Our work demonstrates that HOAS encodings offer substantial benefits to certified programming.

Scope and type safety of the code transformations are statically guaranteed, and our implementation nicely mirrors the paper proof of type preservation, and can hence be seen as an encoding of the proof which happens to be executable as well.
description: Journal of Formalized Reasoning, Vol 8, No 1 (2015)
Dynamic Scaling, Data-collapse and Self-Similarity in Mediation-Driven Attachment Networks
Creators: name: Sarker, Debasish
name: Islam, Liana
name: Hassan, Md. Kamrul
Publisher: name: arXiv
Year: 2018
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Recently, we have shown that if the $i$th node of the Barabási-Albert (BA) network is characterized by the generalized degree $q_i(t)=k_i(t)t_i^β/m$, where $k_i(t)\sim t^β$ and $m$ are its degree at current time $t$ and at birth time $t_i$, then the corresponding distribution function $F(q,t)$ exhibits dynamic scaling. Applying the same idea to our recently proposed mediation-driven attachment (MDA) network, we find that it too exhibits dynamic scaling but, unlike the BA model, the exponent $β$ of the MDA model assumes a spectrum of value $1/2\leq β\leq 1$. Moreover, we find that the scaling curves for small $m$ are significantly different from those of the larger $m$ and the same is true for the BA networks albeit in a lesser extent. We use the idea of the distribution of inverse harmonic mean (IHM) of the neighbours of each node and show that the number of data points that follow the power-law degree distribution increases as the skewness of the IHM distribution decreases. Finally, we show that both MDA and BA models become almost identical for large $m$.
description: 8 pages, 8 captioned figures
Quaternion Convolutional Neural Networks for Detection and Localization of 3D Sound Events
Creators: name: Comminiello, Danilo
name: Lella, Marco
name: Scardapane, Simone
name: Uncini, Aurelio
Publisher: name: arXiv
Year: 2018
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Learning from data in the quaternion domain enables us to exploit internal dependencies of 4D signals and treating them as a single entity. One of the models that perfectly suits with quaternion-valued data processing is represented by 3D acoustic signals in their spherical harmonics decomposition. In this paper, we address the problem of localizing and detecting sound events in the spatial sound field by using quaternion-valued data processing. In particular, we consider the spherical harmonic components of the signals captured by a first-order ambisonic microphone and process them by using a quaternion convolutional neural network. Experimental results show that the proposed approach exploits the correlated nature of the ambisonic signals, thus improving accuracy results in 3D sound event detection and localization.
description: Submitted to ICASSP 2019
Taking back their 'green gold': A blueprint for holistic national legislation regarding medicinal plants in developing countries
Creators: name: Bollo, Vittorio Andrea
Publisher: name: Law
Year: 1998
Subjects: subject: K1519 .B54 B65 1998A
subject: Additional Copy: K1519 .B54 B65 1998 in the Specail Collection and in the Law Library
subject: Biotechnology - Patents.
subject: Patents - Economic aspects - Developing countries.
subject: Indigenous peoples - Legal status, laws, ets.
subject: Plants, Cultivated - Patents.
subject: Foreign trade regulation.
subject: Genetic engineering - Law and legislation.
subject: International trade - moral and ethical aspects.
subject: Biological diversity.
subject: Patents - Moral and ethical aspects.
subject: Medicinal plants - Developing countries - Law and legislation.
subject: Medicinal platns - Law and legislation - Developing countries.

description: Bibliography: p. 234-250
description: UARC
Sampling and Approximation of Bandlimited Volumetric Data
Creators: name: Katz, Rami
name: Shkolnisky, Yoel
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 41A30, 41A63, 65D15, 42C10

description: We present an approximation scheme for functions in three dimensions, that requires only their samples on the Cartesian grid, under the assumption that the functions are sufficiently concentrated in both space and frequency. The scheme is based on expanding the given function in the basis of generalized prolate spheroidal wavefunctions, with the expansion coefficients given by weighted dot products between the samples of the function and the samples of the basis functions. As numerical implementations require all expansions to be finite, we present a truncation rule for the expansions. Finally, we derive a bound on the overall approximation error in terms of the assumed space/frequency concentration.
Higgs-Dilaton Cosmology: From the Early to the Late Universe
Creators: name: García-Bellido, Juan
name: Rubio, Javier
name: Shaposhnikov, Mikhail
name: Zenhäusern, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a minimal scale-invariant extension of the Standard Model of particle physics combined with Unimodular Gravity formulated in \cite{Shaposhnikov:2008xb}. This theory is able to describe not only an inflationary stage, related to the Standard Model Higgs field, but also a late period of Dark Energy domination, associated with an almost massless dilaton. A number of parameters can be fixed by inflationary physics, allowing to make specific predictions for any subsequent period. In particular, we derive a relation between the tilt of the primordial spectrum of scalar fluctuations, $n_s$, and the present value of the equation of state parameter of dark energy, $ω_{DE}^0$. We find bounds for the scalar tilt, $n_s<0.97$, the associated running, $-0.0006-1$. The relation between $n_s$ and $ω_{DE}^0$ allows us to use the current observational bounds on $n_s$ to further constrain the dark energy equation of state to $0< 1+ω_{DE}^0< 0.02$, which is to be confronted with future dark energy surveys.
The 3-Dimensional Distribution of Dust in NGC 891
Creators: name: Schechtman-Rook, Andrew
name: Bershady, Matthew A.
name: Wood, Kenneth
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We produce three-dimensional Monte-Carlo radiative transfer models of the edge-on spiral galaxy NGC 891, a fast-rotating galaxy thought to be an analogue to the Milky Way. The models contain realistic spiral arms and a fractal distribution of clumpy dust. We fit our models to Hubble Space Telescope images corresponding to the B and I bands, using shapelet analysis and a genetic algorithm to generate 30 statistically best-fitting models. These models have a strong preference for spirality and clumpiness, with average face-on attenuation decreasing from 0.24(0.16) to 0.03(0.03) mag in the B(I) band between 0.5 and 2 radial scale-lengths. Most of the attenuation comes from small high-density clumps with low (<10%) filling factors. The fraction of dust in clumps is broadly consistent with results from fitting NGC 891's spectral energy distribution. Because of scattering effects and the intermixed nature of the dust and starlight, attenuation is smaller and less wavelength-dependent than the integrated dust column-density. Our clumpy models typically have higher attenuation at low inclinations than previous radiative transfer models using smooth distributions of stars and dust, but similar attenuation at inclinations above 70 degrees. At all inclinations most clumpy models have less attenuation than expected from previous estimates based on minimizing scatter in the Tully-Fisher relation. Mass-to-light ratios are higher and the intrinsic scatter in the Tully-Fisher relation is larger than previously expected for galaxies similar to NGC 891. The attenuation curve changes as a function of inclination, with R_(B,B-I)=A_(B)/E(B-I) increasing by ~0.75 from face-on to near-edge-on orientations.
description: 26 pages, 18 figures, accepted for publication in ApJ
Μελέτη αιθέριων ελαίων αρωματικών φυτών της ελληνικής χλωρίδας
Creators: name: Δημάδης, Οδυσσέας Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Αιθέρια έλαια
Αρωματικά φυτά
Ελληνική χλωρίδα
Essential oils
Aromatic plants
Greek flora

description: Η παρούσα διπλωματική διατριβή ασχολείται με την μελέτη αιθέριων ελαίων αρωματικών φυτών της ελληνικής χλωρίδας όπως Salvia fruticosa Miller (φασκόμηλο), Thymus sp. (θυμάρι), Mentha piperita (μέντα), Althaea officinalis (αλθαία), Calendula officinalis (καλέντουλα), Aloysia citrodora (λουΐζα), Melissa officinalis (μελισσόχορτο) και Οriganum vulgare (ρίγανη). Το φυτικό υλικό προέρχεται από καλλιέργειες στο προστατευόμενο δάσος Ραδόσι στο Νυμφαίο Καστοριάς και στον Δρυμό Θεσσαλονίκης, συλλέχθηκαν σε μηνιαία βάση και αποτελείται από τα εναέρια τμήματα των φυτών. Συγκεκριμένα, μελετήθηκαν 13 δείγματα από άνθη συμβατικής καλλιέργειας. Τα δείγματα υποβλήθηκαν σε υδροαπόσταξη δύο ωρών, και το αιθέριο έλαιο που παραλήφθηκε, αναλύθηκε με GC-MS. Μετά έγινε ταυτοποίηση των αιθέριων ελαίων. Η μελέτη αυτή πραγματοποιήθηκε στο εργαστήριο Φαρμακογνωσίας, του τμήματος Φαρμακευτικής Α.Π.Θ.
description: This diploma thesis deals with the study of essential oils of aromatic plants of the Greek flora such as Salvia fruticosa Miller (sage), Thymus sp. (thyme), Mentha piperita, Althaea officinalis, Calendula officinalis, Aloysia citrodora, Melissa officinalis and Origanum vulgare. The plant material comes from crops in the protected forest of Radosi in Nymphaeum of Kastoria and Drymos of Thessaloniki, collected on a monthly basis and consists of the aerial parts of the plants. Specifically, 13 samples from conventionally cultivated flowers were studied. The samples were hydrodistilled for two hours, and the obtained essential oil was analyzed by GC-MS. Then the essential oils were identified. This study was carried out in the Pharmacognosy laboratory, of the Department of Pharmacy, A.U.Th.