cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fluctuating epidemics on adaptive networks
Creators: name: Shaw, Leah B.
name: Schwartz, Ira B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A model for epidemics on an adaptive network is considered. Nodes follow an SIRS (susceptible-infective-recovered-susceptible) pattern. Connections are rewired to break links from non-infected nodes to infected nodes and are reformed to connect to other non-infected nodes, as the nodes that are not infected try to avoid the infection. Monte Carlo simulation and numerical solution of a mean field model are employed. The introduction of rewiring affects both the network structure and the epidemic dynamics. Degree distributions are altered, and the average distance from a node to the nearest infective increases. The rewiring leads to regions of bistability where either an endemic or a disease-free steady state can exist. Fluctuations around the endemic state and the lifetime of the endemic state are considered. The fluctuations are found to exhibit power law behavior.
description: Submitted to Phys Rev E
Inviting systemic self-organization: Competencies for complexity regulation from a post-cognitivist perspective
Creators: name: Kimmel, Michael
Publisher: name: Journal of Dynamic Decision Making
Year: 2024

description: This contribution discusses competencies needed for regulating systems with properties of multi-causality and non-linear dynamics (therapeutic, economical, organizational, socio-political, technical, ecological, etc.). Various research communities have contributed insights, but none has come forward with an inclusive framework. To advance the debate, I propose to draw from dynamic systems theory (DST) and “4E” (embodied, embedded, enactive, and extended), cognition approaches, which offer a set of perspectives to understand what expert regulators in real-life settings do. They define the regulator's agency as skillfully imposing constraints on a target system and hereby creating context-sensitive openings for self-organizing dynamics, rather than “controlling” the system. Adept regulators apply multi-pronged and multi-timescale constraints to achieve nuanced effects. Among other things, their skill set includes scarcely noted enactive processual competencies for “emergence management”, which the intellectualistic and insufficiently ecologically situated accounts of the complex problem solving literature omit. To capture the nature of system regulation, I advocate treating regulation dynamics and target system dynamics “symmetrically” by grounding regulator competencies in concepts from complexity theory.
description: Journal of Dynamic Decision Making, Vol. 9 (2023)
Pawlas, Andreas: Die lutherische Berufs- und Wirtschaftsethik
Creators: name: Anhelm, Fritz Erich
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 52 Nr. 1 (2003): Ökumenische Rundschau, Band 52, Heft 1
Modified embedded-atom method interatomic potentials for the Mg-Al alloy system
Creators: name: Jelinek, B.
name: Houze, J.
name: Kim, Sungho
name: Horstemeyer, M. F.
name: Baskes, M. I.
name: Kim, Seong-Gon
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We developed new modified embedded-atom method (MEAM) interatomic potentials for the Mg-Al alloy system using a first-principles method based on density functional theory (DFT). The materials parameters, such as the cohesive energy, equilibrium atomic volume, and bulk modulus, were used to determine the MEAM parameters. Face-centered cubic, hexagonal close packed, and cubic rock salt structures were used as the reference structures for Al, Mg, and MgAl, respectively. The applicability of the new MEAM potentials to atomistic simulations for investigating Mg-Al alloys was demonstrated by performing simulations on Mg and Al atoms in a variety of geometries. The new MEAM potentials were used to calculate the adsorption energies of Al and Mg atoms on Al (111) and Mg (0001) surfaces. The formation energies and geometries of various point defects, such as vacancies, interstitial defects and substitutional defects, were also calculated. We found that the new MEAM potentials give a better overall agreement with DFT calculations and experiments when compared against the previously published MEAM potentials.
description: Fixed a reference
Impact of massive neutrinos on nonlinear matter power spectrum
Creators: name: Saito, Shun
name: Takada, Masahiro
name: Taruya, Atsushi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first attempt to analytically study the nonlinear matter power spectrum for a mixed dark matter (cold dark matter plus neutrinos of total mass ~0.1eV) model based on cosmological perturbation theory. The suppression in the power spectrum amplitudes due to massive neutrinos is, compared to the linear regime, enhanced in the weakly nonlinear regime where standard linear theory ceases to be accurate. We demonstrate that, thanks to this enhanced effect and the gain in the range of wavenumbers to which the PT prediction is applicable, the use of such a nonlinear model may enable a precision of sigma(m_nu,tot) ~ 0.07eV in constraining the total neutrino mass for the planned galaxy redshift survey, a factor of 2 improvement compared to the linear regime.
description: 5 pages, 2 figures, accepted for publication in Phys.Rev.Lett.; minor error for Fig. 2 corrected, and typos corrected
Formation and evolution of density singularities in hydrodynamics of inelastic gases
Creators: name: Fouxon, Itzhak
name: Meerson, Baruch
name: Assaf, Michael
name: Livne, Eli
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We use ideal hydrodynamics to investigate clustering in a gas of inelastically colliding spheres. The hydrodynamic equations exhibit a new type of finite-time density blowup, where the gas pressure remains finite. The density blowups signal formation of close-packed clusters. The blowup dynamics are universal and describable by exact analytic solutions continuable beyond the blowup time. These solutions show that dilute hydrodynamic equations yield a powerful effective description of a granular gas flow with close-packed clusters, described as finite-mass point-like singularities of the density. This description is similar in spirit to the description of shocks in ordinary ideal gas dynamics.
description: 4 pages, 3 figures, final version
Toward a Thermodynamics of Meaning
Creators: name: Enderle, Jonathan Scott
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.7; J.5

description: As language models such as GPT-3 become increasingly successful at generating realistic text, questions about what purely text-based modeling can learn about the world have become more urgent. Is text purely syntactic, as skeptics argue? Or does it in fact contain some semantic information that a sufficiently sophisticated language model could use to learn about the world without any additional inputs? This paper describes a new model that suggests some qualified answers to those questions. By theorizing the relationship between text and the world it describes as an equilibrium relationship between a thermodynamic system and a much larger reservoir, this paper argues that even very simple language models do learn structural facts about the world, while also proposing relatively precise limits on the nature and extent of those facts. This perspective promises not only to answer questions about what language models actually learn, but also to explain the consistent and surprising success of cooccurrence prediction as a meaning-making strategy in AI.
description: To be published in the proceedings of CHR 2020: Workshop on Computational Humanities Research, November 18-20, 2020, Amsterdam, The Netherlands
A change in paradigm: From publications to publishing building blocks of digital accessible biodiversity knowledge
Creators: name: Agosti, Donat
name: Bénichou, Laurence
name: Penev, Lyubomir
Publisher: name: Zenodo
Year: 2021
Subjects: biodiversity
publishing
digital library
Plazi
taxpub
Arcadia Fund

description: So far, our knowledge about biodiversity is in an estimated 500M annually increasing number of pages starting with Linnaeus’ works in 1753 and 1758 respectively. For each species, at least one taxonomic treatment, a clearly dedicated section of a publication, exists. From Linnaeus inset, treatments have further been structured into citations of previous treatments, description, behavioral notes and distributions to name a few, and are based on collections of specimens. These treatment citations, also including statements like synonymies, include the entire catalogue of life, based on a citation network similar to bibliographic citations used in publications. This situation is the best possible prerequisite for leveraging the Internet, even more its aspect of the semantic web, whereby a treatment cites specimens, gene sequences can also be linked back to the citing treatment, the knowledge graph. At the same time, research results about a specimen, a gene sequence are immediately accessible, facilitating many novel opportunities, speeding up taxonomists' work and providing a never seen access to biodiversity data for life sciences, conservationists and beyond. It complements ongoing research on sequencing all species of life (e.g. BioScan), or citizen science initiatives (e.g. iNaturalist). It provides existing knowledge about the identified sequenced or photographed species, a platform to add data about unknown species and include it into the corpus of digital accessible knowledge. Such a system also allows new entries to this knowledge, for example from each specimen, a published figure, a taxonomic or a person's name. This lecture will present two approaches. The first focuses on how to make known biodiversity accessible through the Biodiversity Literature Repository (BLR) and TreatmentBank. The second is based on Pensoft’s, the Consortium of European Taxonomic Facilities (CETAF) publishing group’s and the European Journal of Taxonomy (EJT) publishing styles, making new data immediately digital accessible knowledge. This includes making treatments, figures, materials citations findable, accessible, interoperable and reusable (FAIR) and therefore making them accessible and reusable in the Global Biodiversity Information Facility (GBIF). The ultimate goal of this change in paradigm is to make not only all known data about biodiversity digital immediately accessible knowledge but make use of the authors’ already existing structured data in their research environment.
Van der Waals Cascade in Supercritical Turbulence near a Critical Point
Creators: name: Tanogami, Tomohiro
name: Sasa, Shin-ichi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate a quite strong turbulence in a supercritical fluid near a gas-liquid critical point. Specifically, we consider a case in which the Kolmogorov scale is much smaller than the equilibrium correlation length $ξ$. Although equilibrium critical fluctuations are destroyed by turbulence, $ξ$ still provides a crossover length scale between two types of energy cascade. At scales much larger than $ξ$, the Richardson cascade becomes dominant, whereas at scales much smaller than $ξ$, another type of cascade, which we call the van der Waals cascade, is induced by density fluctuations. Experimental conditions required to observe the van der Waals cascade are also discussed.
description: 18 pages, 2 figures. Minor revisions are made in ver. 2. arXiv admin note: text overlap with arXiv:2009.11057
O que pode um jardim relacional e multidisciplinar?
Creators: name: Tavares, Reginaldo da Nóbrega
name: Pohlmann, Angela Raffin
name: Ribeiro, Rafaela Barbosa
name: Rabaiolli, Gustavo
name: Bunde, Ricardo Kurz
name: Dornelas, Tarcis Suso
Publisher: name: Labfront/UEMG
Year: 2024

description: Este texto resulta de parte de uma pesquisa desenvolvida na Universidade Federal de Pelotas (UFPel), por um grupo multidisciplinar formado por estudantes de Artes Visuais e de Engenharia, que investiga o processo criativo coletivo de projetar um Jardim assentado em vasos. Neste projeto, os vasos podem ser colocados em ambiente fechado ou aberto, e posicionados em diversas formações de vizinhança. O Jardim será cuidado por um aparato tecnológico digital que ajudará a regar as plantas. Os referenciais teóricos incluem o livro “Ética” de Espinoza; o livro “Estado de crise”, de Zygmunt Bauman e Carlo Bordoni; e “Sociedade do cansaço” de Byung-Chul-Han. Os referenciais artísticos incluem as experiências realizadas pela UFRN com o jardim sensorial como espaço de inclusão. Como resultado, espera-se que o Jardim possa fornecer mudas de plantas para as pessoas interessadas nas espécies disponíveis, e oportunizar possibilidades de reconexão pelas experiências com as plantas do Jardim.
Lipase katalysierte Synthese von Mono- und Diestern sowie deren Untersuchung auf antibakterielle Eigenschaften
Creators: name: Langschwager, Fanny
Publisher: name: Universität Rostock
Year: 2018
Subjects: subject: 540 Chemistry & allied sciences
subject: 660 Chemical engineering

description: Im Rahmen dieser Arbeit wurden 21, darunter 12 noch nicht in der Literatur beschriebene, Mono- und Diester ausgehend von Dicarbonsäuren und Alkenolen biokatalytisch synthetisiert. Die Isolierung der synthetisierten Mono- und Diester erfolgte mittels Säulenchromatografie. Zudem wurden Versuche zur Maßstabsvergrößerung durchgeführt, die den Reaktionsverlauf bestätigten. Die isolierten Ester wurden hinsichtlich ihres antibakteriellen Potentials untersucht.
Teacher use of language which helps or hinders understanding of mathematics by second language learners
Creators: name: Borgen, Katharine L.
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to determine some of the factors relating to teacher use of English in the mathematics classroom that senior second language learners identified as helping or hindering to their learning of the subject. Variations of Flanagan's (1954) Critical Incident Technique and Ginsburg's (1981) Clinical Interview were employed to elicit information from eighteen students with various linguistic backgrounds to identify aspects of the English language and methods of explanation which they found helpful or hindering in their attempt to understand mathematics in English as second language. The interviews with the students were audio-taped and transcribed verbatim. Excerpts from the transcriptions are used as examples to indicated the helps/hindrances identified by the students. Students identified many language related problems which they, as second language learners, have in trying to understand mathematics. These centered around five themes: 1. Vocabulary, both basic and mathematics specific, 2. Need to translate for understanding, 3. Differences in understanding involved depending upon written vs spoken language, 4. Self-consciousness because of inability to express themselves in a second language, and 5. Motivation and interest in learning. Various aspects of each theme are discussed along with methods that may help students deal with them. The helping methods are discussed under the two themes that emerged: 1. Techniques that the teacher could use, and 2. Coping strategies used by the students themselves. Students indicated that while they felt it was their personal responsibility to learn enough of the English language to cope in the mainstream mathematics classroom, certain strategies used by the teacher or that they employed themselves could help with different problems. Finally, suggestions are given, both for teachers in the classroom to make mathematics more second language learner friendly, and for areas where further research would be beneficial.
Creative Commons für Open Educational Resources (OER)
Creators: name: Woitas, Kathi
Publisher: name: Zenodo
Year: 2019
Subjects: OER
Open Educational Resources
Creative Commons
Lizenzierung von Lehr- und Lernmaterial
Urheberrecht im Unterricht

description: Lehrmaterial (Präsentation mit Animationen und eingebettenen Übungen) für die Einführung in und Verwendung von Creative-Commons-Lizenzen für freie Unterrichtsmaterialien (OER). Der Inhalt umfasst: urheberrechtliche Grundlagen (Schweizer Recht), Persönlichkeits- und Verwertungsrechte Urheberrecht im Unterrichtskontext (relevante Schranken) Einführung in das Creative-Commons-Lizenz-System (CC-Lizenzen, Public Domain Mark, Public Domain Dedication) Vorteile und Funktionsweise der CC-Lizenzierung Welche CC-Lizenzen entsprechen der Open-Definition? Diskussion der Non-Commercial- und No-Derivatives-Lizenzbestandteile, mögliche Fallstricke und unerwünschte Effekte (Übung) Die generelle Empfehlung: CC BY 4.0 Wie referenziere ich CC-Content korrekt? Referenzieren und lizenzieren leicht gemacht: praktische Anwendungen und Hilfsmittel Abschlussübung: "License it!" Die Präsentation legt das Schweizer Urheberrecht zugrunde. Das deutsche Urheberrecht ist zwar in vielen Belange ähnlich verfasst, diese Passagen müssen bei einer Nachnutzung in anderen Rechtsordnungen aber zwingend angepasst werden.
description: {"references": ["Kreutzer, Till (2016): Open Content Ein Praxisleitfaden zur Nutzung von Creative Commons Lizenzen . Berlin: Deutsche UNESCO Kommission e. V., Hochschulbibliothekszentrum des Landes Nordrhein Westfalen ( hbz ), Wikimedia Deutschland. https://upload.wikimedia.org/wikipedia/commons/c/cd/Open_Content_ Ein_Praxisleitfaden_zur_Nutzung_von_Creative Commons Lizenzen.pdf", "Klimpel , Paul (2014): Freies Wissen Dank Creative Commons Lizenzen. Folgen, Risiken und Nebenwirkungen der Bedingung \u00bbnicht kommerziell NC\u00ab . Berlin: Wikimedia Deutschland, iRights.info & CC DE. https://irights.info/wp content/uploads/userfiles/CC NC_Leitfaden_web.pdf", "Muu\u00df Meerholz, J\u00f6ran (2018): Freie Unterrichtsmaterialien finden, rechtssicher einsetzen, selbst machen und teilen . Weinheim, Basel: Beltz. http://www.was ist oer.de/wp content/uploads/sites/17/2018/01/Joeran Muuss Merholz Freie Unterrichtsmaterialien Beltz 2018.pdf", "RWTH Aachen (2018): MINT L OER amt . learntech.rwth aachen.de/ cms LearnTech /Forschung/Projekte/~nhem/MINT L OER amt/"]}
Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, dated December 8, 1943, regarding bonds and the Public Utilities Commission
Creators: name: Trustees Of The Winfield And Okanagan Centre Irrigation District
Publisher: name: The University of British Columbia
Year: 2017

description: Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, dated December 8, 1943, regarding bonds and the Public Utilities Commission.
SMA Imaging of the Maser Emission from the H30$α$ Radio Recombination Line in MWC349A
Creators: name: Weintroub, Jonathan
name: Moran, James M.
name: Wilner, David J.
name: Young, Ken H.
name: Rao, Ramprasad
name: Shinnaga, Hiroko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We used the Submillimeter Array to map the angular distribution of the H30$α$ recombination line (231.9 GHz) in the circumstellar region of the peculiar star MWC349A. The resolution was $1\farcs2$, but because of high signal-to-noise ratio we measured the positions of all maser components to accuracies better than $0\farcs01$, at a velocity resolution of $1 kms$. The two strongest maser components (called high velocity components) at velocities near -14 and $32 kms$ are separated by $0\farcs048 \pm 0\farcs001$ (60 AU) along a position angle of $102 \pm 1\arcdeg$. The distribution of maser emission at velocities between and beyond these two strongest components were also provided. The continuum emission lies at the center of the maser distribution to within 10 mas. The masers appear to trace a nearly edge-on rotating disk structure, reminiscent of the water masers in Keplerian rotation in the nuclear accretion disk of the galaxy NGC4258. However, the maser components in MWC349A do not follow a simple Keplerian kinematic prescription with $v \sim r^{-1/2}$, but have a larger power law index. We explore the possibility that the high velocity masers trace spiral density or shock waves. We also emphasize caution in the interpretation of relative centroid maser positions where the maser is not clearly resolved in position or velocity, and we present simulations that illustrate the range of applicability of the centroiding method.
description: 23 pages with 9 figures (two of these figures are vertically aligned as Figure 4) submitted to the Astrophysical Journal
Η διαχείριση των κρίσεων στην ελληνική κεφαλαιαγορά:
Creators: name: Σταματοπούλου, Ολγα Κυριάκου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Κεφαλαιαγορά
Χρηματιστήριο αξιών
Οικονομική κρίση
Τιτλοποίηση
Χρηματιστηριακό κραχ
Μέτρα αντιμετώπισης της κρίσης
Capital market
Stock exchange market
Economic crisis
Crash of stock market
Securitization
Crisis management

description: Η εργασία περιγράφει συνοπτικά τις έννοιες της κεφαλαιαγοράς, του χρηματιστηρίου καθώς και την πορεία του στο χρόνο. Επίσης παρατίθεται περιγραφή της κρίσης του 1999, στο ελληνικό χρηματιστήριο, τα αίτια που την προκάλεσαν και οι συνέπειες που επέφερε στην ελληνική οικονομία και στα νοικοκυριά. Επειτα περιγράφεται η κρίση του 2009, οι διεθνείς συνθήκες που επικρατούσαν και οδήγησαν την ελληνική οικονομία σε αυτό το σημείο καθώς και οι συνέπειες που επέσυρε. Στην εργασία περιλαμβάνεται σύγκριση των δύο κρίσεων (1999, 2009) αναφέροντας ομοιότητες και διαφορές. Τέλος αναφέρονται τα μέτρα αντιμετώπισης της κρίσης διεθνώς και στα πλαίσια της ελληνικής οικονομίας, τα μαθήματα που προσφέρει ένα τέτοιο φαινόμενο και οι ευκαιρίες που προκύπτουν
description: This dissertation outlines the concept of capital market and its history. It also outlines the crisis of 1999 in greek stock exchange market, its causes and its impacts on greek economy. Then, the crisis of 2009 is described, the international conditions as well as how they affect in greek economy. It also includes a comparison of these two crises, the differences and the simularities, At the end, there are initiatives of response to this phenomenon, internationally, the lessons from crisis and the opportunities that appear during this situation
Continuous phase transition between Neel and valence bond solid phases in a J-Q-like spin ladder system
Creators: name: Ogino, Takuhiro
name: Kaneko, Ryui
name: Morita, Satoshi
name: Furukawa, Shunsuke
name: Kawashima, Naoki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate a quantum phase transition between a Neel phase and a valence bond solid (VBS) phase, in each of which a different Z2 symmetry is broken, in a spin-1/2 two-leg XXZ ladder with a four-spin interaction. The model can be viewed as a one-dimensional variant of the celebrated J-Q model on a square lattice. By means of variational uniform matrix product state calculations and an effective field theory, we determine the phase diagram of the model, and present evidences that the Neel-VBS transition is continuous and belongs to the Gaussian universality class with the central charge c=1. In particular, the critical exponents $β, η,$ and, $ν$ are found to satisfy the constraints expected for a Gaussian transition within numerical accuracy. These exponents do not detectably change along the phase boundary while they are in general allowed to do so for the Gaussian class.
description: 14 pages, 11 figures
Point vortices dynamics on a rotating sphere and modeling of global atmospheric vortices interaction
Creators: name: Mokhov, Igor I.
name: Chefranov, Sergey G.
name: Chefranov, Alexander G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: It is shown that the hydrodynamics equations for a thin spherical liquid layer are satisfied by the stream function of a pair of antipodal vortices-APV, in contrast to the stream function of a single point vortex on a sphere with a background of a uniform opposite sign vorticity. A simple zero solution of the equation of the absolute vorticity conservation is used for bypassing well-known nonlinear problem of a point vortices interaction with regular vorticity field and an exact solution for APVs dynamics problem on a rotating sphere is obtained. Due to this a new stable stationary solution for the dynamics of APV is obtained, which can model the dynamics of the global vortex structures such as atmospheric centers of action.
description: 3 figures
An Econometric Analysis of Volatility Discovery
Creators: name: Dias, Gustavo Fruet
name: Papailias, Fotis
name: Scherrer, Cristina
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Virology

description: We investigate information processing in the stochastic process driving stock’s volatility (volatility discovery). We apply fractionally cointegration techniques to decompose the estimates of the market-specific integrated variances into an estimate of the common integrated variance of the efficient price and a transitory component. The market weights on the common integrated variance of the efficient price are the volatility discovery measures. We relate the volatility discovery measure to the price discovery framework and formally show their roles on the identification of the integrated variance of the efficient price. We establish the limiting distribution of the volatility discovery measures by resorting to both long span and in-fill asymptotics. The empirical application is in line with our theoretical results, as it reveals that trading venues incorporate new information into the stochastic volatility process in an individual manner and that the volatility discovery analysis identifies a distinct information process than that based on the price discovery analysis.
Investigating grain growth in disks around southern T Tauri stars at millimetre wavelengths
Creators: name: Lommen, Dave
name: Wright, Chris M.
name: Maddison, Sarah T.
name: Jorgensen, Jes K.
name: Bourke, Tyler L.
name: van Dishoeck, Ewine F.
name: Hughes, Annie
name: Wilner, David J.
name: Burton, Michael
name: van Langevelde, Huib Jan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: CONTEXT - Low-mass stars form with disks in which the coagulation of grains may eventually lead to the formation of planets. It is not known when and where grain growth occurs, as models that explain the observations are often degenerate. A way to break this degeneracy is to resolve the sources under study. AIMS - To find evidence for the existence of grains of millimetre sizes in disks around in T Tauri stars, implying grain growth. METHODS - The Australia Telescope Compact Array (ATCA) was used to observe 15 southern T Tauri stars, five in the constellation Lupus and ten in Chamaeleon, at 3.3 millimetre. The five Lupus sources were also observed with the Submillimeter Array (SMA) at 1.4 millimetre. Our new data are complemented with data from the literature to determine the slopes of the spectral energy distributions in the millimetre regime. RESULTS - Ten sources were detected at better than 3sigma with the ATCA, with sigma ~1-2 mJy, and all sources that were observed with the SMA were detected at better than 15sigma, with sigma ~4 mJy. Six of the sources in our sample are resolved to physical radii of ~100 AU. Assuming that the emission from such large disks is predominantly optically thin, the millimetre slope can be related directly to the opacity index. For the other sources, the opacity indices are lower limits. Four out of six resolved sources have opacity indices
description: 13 pages, 7 figures, 5 tables, accepted for publication in A&A
Hierarchically nanostructured thermoelectric materials: Challenges and opportunities for improved power factors
Creators: name: Neophytou, Neophytos
name: Vargiamidis, Vassilios
name: Foster, Samuel
name: Graziosi, Patrizio
name: Oliveira, Laura de Sousa
name: Chakraborty, Dhritiman
name: Li, Zhen
name: Thesberg, Mischa
name: Kosina, Hans
name: Bennett, Nick
name: Pennelli, Giovanni
name: Narducci, Dario
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The field of thermoelectric materials has undergone a revolutionary transformation over the last couple of decades as a result of the ability to nanostructure and synthesize myriads of materials and their alloys. The ZT figure of merit, which quantifies the performance of a thermoelectric material has more than doubled after decades of inactivity, reaching values larger than two, consistently across materials and temperatures. Central to this ZT improvement is the drastic reduction in the material thermal conductivity due to the scattering of phonons on the numerous interfaces, boundaries, dislocations, point defects, phases, etc., which are purposely included. In these new generation of nanostructured materials, phonon scattering centers of different sizes and geometrical configurations (atomic, nano- and macro-scale) are formed, which are able to scatter phonons of mean-free-paths across the spectrum. Beyond thermal conductivity reductions, ideas are beginning to emerge on how to use similar hierarchical nanostructuring to achieve power factor improvements. Ways that relax the adverse interdependence of the electrical conductivity and Seebeck coefficient are targeted, which allows power factor improvements. For this, elegant designs are required, that utilize for instance non-uniformities in the underlying nanostructured geometry, non-uniformities in the dopant distribution, or potential barriers that form at boundaries between materials. A few recent reports, both theoretical and experimental, indicate that extremely high power factor values can be achieved, even for the same geometries that also provide ultra-low thermal conductivities. Despite the experimental complications that can arise in having the required control in nanostructure realization, in this colloquium, we aim to demonstrate, mostly theoretically, that it is a very promising path worth exploring.
description: 72 pages, 13 figures
Μουσουλμάνοι/ες μετανάστες/τριες στην Αθήνα: ισλαμοφοβία-κοινωνικός αποκλεισμός-Ενταξη
Creators: name: Κανονίδου, Πολυξένη Ιωάννη
name: Κυρέζη, Αθανασία Βασιλείου
name: Σορώτου, Φλώρα Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Μουσουλμάνοι μετανάστες
Ισλαμοφοβία
Βιβλίο θρησκευτικών
Muslim immigratns
Islamophobia
Religious education

description: Η εργασία ερευνά την εικόνα των μουσουλμάνων μεταναστών/τριών που ζουν στην Αθήνα, μέσα από το πρίσμα της Ισλαμοφοβίας, του Κοινωνικού Αποκλεισμού και της Ένταξης. Υλικό της έρευνας αποτελούν βιβλιογραφικές και ηλεκτρονικές πηγές, τα σχολικά εγχειρίδια για τη διδασκαλία των Θρησκευτικών στο δημοτικό σχολείο και το γυμνάσιο, άρθρα τεσσάρων εφημερίδων που αναφέρονται σε μουσουλμάνους/ες καθώς και τρεις προσωπικές μαρτυρίες από άτομα που εκπροσωπούν ή και έχουν σημαντικό λόγο για τη μουσουλμανική κοινότητα της Αθήνας.Η εργασία στοχεύει να διερευνήσει α) την επαρκή υποστήριξη της πολυπολιτισμικότητας στα σχολικά εγχειρίδια των Θρησκευτικών όπως προβάλλονται στα αναλυτικά προγράμματα και το νομικό πλαίσιο της χώρας, β) φαινόμενα ισλαμοφοβίας στην Ελλάδα μέσα από τον ελληνικό τύπο, γ) προβλήματα ένταξης των μεταναστών/τριών της Αθήνας που τους οδηγούν σε κοινωνικό αποκλεισμό και ειδικότερα τη δυνατότητα των μουσουλμάνων στην άσκηση των θρησκευτικών τους δικαιωμάτων.Η έρευνα πραγματοποιήθηκε από το Φεβρουάριο του 2007 έως και το Νοέμβριο του 2008.
description: The research investigates the Muslim immigrants that live in Athens through the concepts of Islamophobia, Social Exclusion and Integration. Bibliographical and electronic sources, school book for the instruction of religious education in primary and secondary education, articles about Muslims from four newspapers personal reports of people that either represent or play an important role in the Muslim community of Athens. The research aims at investigating a)the adequate support of multi-culturalism in the school books of religious education as presented in the curriculum and the legal system of the country. B0 phenomena of islamophobia through the Greek media c) integration problems of the immigrants of Athens that lead them to social exclusion and especially the possibility that Muslims have to practice their religious rights.The research was conducted in the period February 2007 to November 2008.
Bounding the Bogoliubov coefficients
Creators: name: Boonserm, Petarpa
name: Visser, Matt
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: While over the last century or more considerable effort has been put into the problem of finding approximate solutions for wave equations in general, and quantum mechanical problems in particular, it appears that as yet relatively little work seems to have been put into the complementary problem of establishing rigourous bounds on the exact solutions. We have in mind either bounds on parametric amplification and the related quantum phenomenon of particle production (as encoded in the Bogoliubov coefficients), or bounds on transmission and reflection coefficients. Modifying and streamlining an approach developed by one of the present authors [Phys. Rev. A 59 (1999) 427-438], we investigate this question by developing a formal but exact solution for the appropriate second-order linear ODE in terms of a time-ordered exponential of 2x2 matrices, then relating the Bogoliubov coefficients to certain invariants of this matrix. By bounding the matrix in an appropriate manner, we can thereby bound the Bogoliubov coefficients.
description: 25 pages, plain LaTeX
The confinement free energies of non-ideal branched polymers and ideal unbranched polymers are the same
Creators: name: Ghafouri, Rouzbeh
name: Rudnick, Joseph
name: Bruinsma, Robijn
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We use the method of dimensional reduction to show that a branching polymer with excluded volume interaction confined between two flat plates has, in the thermodynamic limit, a confinement free energy and density profile that is the same as that of an ideal linear polymer with the same number of monomers and the same monomer-plate interaction potential. Condensation due to branching is exactly compensated by swelling due to excluded volume interaction.
description: 12 pages, no figures
Θεατρικό παιχνίδι και σύνδρομο Down:
Creators: name: Παρδάλη, Μαρία Στυλιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Θεατρικό παιχνίδι
Νοητική καθυστέρηση
Σύνδρομο Down
Εμψυχωτής
Δυναμική ομάδων
Βιωματικός τρόπος μάθησης
Drama play
Mental retardation
Dawn syndrome
Encourager
Dynamic groups
Learning through experience

description: Η παρούσα έρευνα αναφέρεται στη χρήση του θεατρικού παιχνιδιού με σκοπό την ενίσχυση των κοινωνικών δεξιοτήτων των ατόμων με σύνδρομο Down. Πρόκειται για ποιοτική έρευνα και συγκεκριμένα για μελέτη περίπτωσης. Ο ερευνητής μέσα από το μεθοδολογικό εργαλείο της παρατήρησης κατέγραψε τις συμπεριφορές των έξι παιδιών με σύνδρομο Down αλλά και του εμψυχωτή κατά τη διάρκεια των δέκα συναντήσεων του θεατρικού παιχνιδιού. Σύμφωνα με τα αποτελέσματα της έρευνας η διαδικασία του θεατρικού παιχνιδιού βοηθάει στην εξέλιξη των κοινωνικών δεξιοτήτων των παιδιών με σύνδρομο Down καθώς βασίζεται στις αρχές της δυναμικής των ομάδων και της βιωματικής μάθησης.
description: This research is referred to the use of drama play in order to enhance social skills of people with Down syndrome. It is a qualitive research and more specifically a case study. The person who has the responsibility of the specific research, observed the ten drama play meetings of six children with down syndrome and write down the behaviors not only of the children but of their therapist too. The results of the research were that there are indications that the dramatic play process have the potential to be effective in promoting social skills of people with Down syndrome, as it is a group based process and provides the learning through experience.
Η κατάκτηση της δεύτερης γλώσσας από παιδιά σε διαπολιτισμικά δημοτικά σχολεία:
Creators: name: Κανακούδα, Κυριακή Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Δεύτερη γλώσσα
Επίπεδο επάρκειας μητρικής γλώσσας
Επικοινωνιακές ακαδημαϊκές δεξιότητες
Διδακτικές προσεγγίσεις
Αξιολόγηση
Προσδοκίες
Second language
Level of the mother tongue
Communicative academic skills
Pedagogical approaches
Evaluation
Expectations

description: Η παρούσα διπλωματική εργασία έχει θέμα την κατάκτηση της δεύτερης γλώσσας από παιδιά σε διαπολιτισμικά σχολεία και πώς οι απόψεις των εκπαιδευτικών επηρεάζουν την κατάκτησή της. Είναι ποιοτική έρευνα μέσω συνεντεύξεων. Πραγματοποιήθηκε σε δύο διαπολιτισμικά σχολεία της Θεσσαλονίκης και ο αριθμός των συνεντεύξεων που έγιναν ήταν 18 (14 δάσκαλοι/ες και 4 φιλόλογοι του Προγράμματος του Πανεπιστημίου Αθηνών) την περίοδο Μαρτίου – Ιουνίου 2008. Ερευνήθηκε η μητρική και η δεύτερη γλώσσα σε συνάρτηση με τις επιδόσεις, την πρόοδο των δίγλωσσων μαθητών/τριών και τη μέθοδο διδασκαλίας. Παράλληλα, ερευνήθηκαν οι προσδοκίες των εκπαιδευτικών για τους δίγλωσσους μαθητές/τριες και έγιναν προτάσεις από αυτούς για τη βελτίωση της εκπαίδευσης αυτών των παιδιών.
description: The subject of this scientific research is about the acquisition of α second language fοr children in multicultural schools and how the views of the teachers affect this. It is a qualitative research with the use of interviews. It has taken place in two multicultural schools of Thessaloniki. There were 18 interviews (14 teachers and 4 professors of Greek Literature) for the period from March to June 2008. Research was done to see how the mother tongue and the second language corresponded to the progress of bilingual students with the teaching methods. At the same time, research was done into the expectations of teachers for the bilingual students and suggestions were made towards the improvement of these children’s education.
The Boltzmann-Grad limit of the periodic Lorentz gas
Creators: name: Marklof, Jens
name: Strombergsson, Andreas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37A60, 37D50, 82C05, 82C40

description: We study the dynamics of a point particle in a periodic array of spherical scatterers, and construct a stochastic process that governs the time evolution for random initial data in the limit of low scatterer density (Boltzmann-Grad limit). A generic path of the limiting process is a piecewise linear curve whose consecutive segments are generated by a Markov process with memory two.
description: 51 pages
Electromagnetic and anisotropic extension of a plethora of well-known solutions describing relativistic compact objects
Creators: name: Komathiraj, K.
name: Sharma, Ranjan
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We demonstrate a technique to generate new class of exact solutions to the Einstein-Maxwell system describing a static spherically symmetric relativistic star with anisotropic matter distribution. An interesting feature of the new class of solutions is that one can easily switch off the electric and/or anisotropic effects in this formulation. Consequently, we show that a plethora of well known stellar solutions can be identified as sub-class of our class of solutions. We demonstrate that it is possible to express our class of solutions in a simple closed form so as to examine its physical viability for the studies of relativistic compact stars
description: Astrophys. Space. Sci. (to appear)
Establishment of inside-outside polarity in early embryos
Creators: name: Stolpner, Naomi J.
name: 0009-0003-7242-5817
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: Development
Cell polarity
C. elegans
PAR polarity
Embryology
Inside-outside polarity

description: Cell polarity describes molecularly and functionally distinct domains on opposite sides of a cell and is essential in both development and tissue homeostasis. During development, cells can remodel their polarity axes (“polarity switching”) to establish spatial patterns necessary for processes including oriented cell division, compaction, and gastrulation. The PAR proteins, which are conserved among metazoa, are important for cell polarity during development and to maintain polarized tissues. In the C. elegans embryo, polarity switching occurs when PAR proteins that were initially polarized along the anterior-posterior axis in the zygote change orientation to polarize along the apicobasal axis at the 8-cell stage. Specifically, the anterior PAR proteins localize to the apical surface of cells, and the posterior PARs localize to the basolateral cell-cell contacts in an inside-outside orientation, similar to mouse 8-cell embryos. Remarkably, polarity switching can occur even when transcription is blocked, indicating that maternal factors are sufficient to drive polarity switching. To understand polarity switching, we first carefully characterized polarity at the 8-cell stage to establish an “endpoint” to compare to zygotic polarity. Surprisingly, we found that PAR polarity proteins, which form apical caps at the center of the contact free membrane, localize dynamically during the cell cycle and contribute to spindle orientation and proper cell positioning and can regulate spindle orientation in cooperation with the key polarity kinase aPKC. Surprisingly, apical PAR-3 can form polarity caps independently of actomyosin flows and individual 8-cell blastomeres can polarize independently of cell contacts. Together, our results reveal a role for apical polarity caps in regulating spindle orientation in symmetrically dividing cells. We now think of the cell-contacts not as symmetry breaking cues, but rather as axis specifiers that steer the autonomously polarizing PAR proteins to coordinate multiple cells’ polarity into one unified “axis” that specifies inside-outside polarity. Finally, we examined how the same PAR polarity proteins re-orient over developmental time and found that translation of maternal mRNAs, under the control of the kinase GSK-3 via OMA-1, is necessary for polarity switching to occur.
Συστήματα μεταφοράς σε μητροπολιτικές περιοχές της Μεσογείου. Σύγκριση με την περίπτωση της Θεσσαλονίκης. Νομοθεσία-σχεδιασμός-διαβούλευση-τάσεις
Creators: name: Τσαβδάρογλου, Χαράλαμπος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Συστήματα μεταφοράς
Μητροπολιτικές περιοχές
Μεσόγειος
Θεσσαλονίκη
Σχεδιασμός μεταφορών
Πολεοδομικός χωροταξικός σχεδιασμός
Transportation systems
Metropolitan areas
Mediterranean
Thessaloniki
Trasportation planning
Urban and spatial planning

description: Αντικείμενο της διπλωματικής εργασίας «Συστήματα Μεταφοράς σε Μητροπολιτικές Περιοχές της Μεσογείου, σύγκριση με την περίπτωση της Θεσσαλονίκης, νομοθεσία – σχεδιασμός – διαβούλευση – τάσεις» αποτελεί η κριτική μελέτη της ευρωπαϊκής και εθνικής νομοθεσίας για τις αστικές μεταφορές, οι διαδικασίες δημόσιας διαβούλευσης στο συγκοινωνιακό σχεδιασμό, οι προτάσεις πρωτοβουλιών της τοπικής αυτοδιοίκησης που αφορούν αστικά συστήματα μεταφοράς καθώς και η μελέτη των υφιστάμενων και προγραμματικών μέσων μετακίνησης και συστημάτων μεταφοράς σε επιλεγμένες μητροπολιτικές περιοχές της ευρύτερης περιοχής της Μεσογείου. Στόχος της διπλωματικής εργασίας αποτελεί τόσο η εξαγωγή συμπερασμάτων για την υφιστάμενη κατάσταση και τις μελλοντικές τάσεις στα συστήματα μεταφοράς στις υπό εξέταση μητροπολιτικές περιοχές της Μεσογείου και η σύγκρισή τους με την περίπτωση της Θεσσαλονίκης, όσο και η κατάθεση προτάσεων για τον μελλοντικό συγκοινωνιακό σχεδιασμό της ευρύτερης περιοχής της Θεσσαλονίκης, λαμβάνοντας υπόψη τα ευρωπαϊκά, εθνικά και τοπικά πλαίσια, σχέδια, μελέτες και έρευνες, με έμφαση στις αειφόρες αστικές μεταφορές, στη σύνδεση του πολεοδομικού με τον συγκοινωνιακό σχεδιασμό και στις διαδικασίες δημόσιας διαβούλευσης.
description: This Thesis “Transportation Systems in Metropolitan Regions of Mediterranean and the comparison with Thessaloniki’s case, legislation - planning - consultation - tendencies” object is the critical study of urban transportations both European and national legislation, public consultation processes for transport planning, local government’s initiatives concerning urban transport systems as well as the study of existing and future transport systems in selected Mediterranean metropolitan regions. The objective of this thesis is to evaluate the existing situation and future tendencies in the transport systems in the Mediterranean metropolitan regions and compare them with the case of Thessaloniki, and to suggest proposals for the future transport planning of the wider region of Thessaloniki, taking into consideration the European, national and local frames, plans, studies and researches, with emphasis on the sustainable urban transports, the connection between urban and transport planning and the public consultation processes.
Refraction of a Gaussian Seaway
Creators: name: Heller, E. J.
name: Kaplan, L.
name: Dahlen, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Refraction of a Longuet-Higgins Gaussian sea by random ocean currents creates persistent local variations in average energy and wave action. These variations take the form of lumps or streaks, and they explicitly survive dispersion over wavelength and incoming wave propagation direction. Thus, the uniform sampling assumed in the venerable Longuet-Higgins theory does not apply following refraction by random currents. Proper handling of the non-uniform sampling results in greatly increased probability of freak wave formation. The present theory represents a synthesis of Longuet-Higgins Gaussian seas and the refraction model of White and Fornberg, which considered the effect of currents on a plane wave incident seaway. Using the linearized equations for deep ocean waves, we obtain quantitative predictions for the increased probability of freak wave formation when the refractive effects are taken into account. The crest height or wave height distribution depends primarily on the ``freak index", gamma, which measures the strength of refraction relative to the angular spread of the incoming sea. Dramatic effects are obtained in the tail of this distribution even for the modest values of the freak index that are expected to occur commonly in nature. Extensive comparisons are made between the analytical description and numerical simulations.
description: 18 pages, 10 figures