cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Double-Bubble CME of the 2020 December 14 Total Solar Eclipse
Creators: name: Boe, Benjamin
name: Yamashiro, Bryan
name: Druckmuller, Miloslav
name: Habbal, Shadia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Total solar eclipses (TSEs) continue to provide an invaluable platform for exploring the magnetic topology of the solar corona and for studying dynamic events such as Coronal Mass Ejections (CMEs) -- with a higher spatial resolution over a larger spatially continuous extent than is possible to achieve with any other method at present. In this Letter, we present observations of the full extent of a `double-bubble' CME structure from the solar surface out to over 5 solar radii, as captured during the 2020 December 14 TSE. Its evolution through the corona was recorded from two observing sites separated by 13 minutes in their times of totality. The eclipse observations are complemented by a plethora of space-based observations including: Extreme Ultraviolet observations of the solar disk and low corona from SDO/AIA and STEREO-A/EUVI, white-light coronagraph observations from SOHO/LASCO-C2, radio from STEREO-A/WAVES and WIND/WAVES, and X-ray from GOES-16. We also characterize the magnetic field with a potential field source surface model. This CME event itself is of particular interest, as it demonstrates interactions between a prominence channel and an active region that led to the double-bubble structure. Despite the plethora of space-based observations, only the eclipse data are able to provide the proper context to connect these observations and yield a detailed study of this unique CME.
description: 12 pages, 5 figures, accepted for publication in ApJ Letters
Meinungsbildungsprozesse unter dem Einfluss digitaler Medien und deren Gefahrenpotenziale für demokratische Systeme
Creators: name: Autenrieth, Daniel
Publisher: name: Medienimpulse
Year: 2016

description: Ausgehend vom Begriff der Meinung werden in diesem Essay die Auswirkungen digitaler Medien auf den Meinungsbildungsprozess veranschaulicht. Dabei werden zum einen die Wirkungsweisen von Medien im Allgemeinen und zum anderen, unter Zuhilfenahme neuer Studien, die Betrachtung sozialer Medien und Suchmaschinen eine Rolle spielen.
description: Medienimpulse, Bd. 54 Nr. 2 (2016): 2/2016 - Internet und digitale Medien als sexualisierte Räume
Quantum oscillations in the parent magnetic phase of an iron arsenide high temperature superconductor
Creators: name: Sebastian, Suchitra E.
name: Gillett, J.
name: Harrison, N.
name: Lau, P. H. C.
name: Mielke, C. H.
name: Lonzarich, G. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report quantum oscillation measurements in SrFe2As2 - which is an antiferromagnetic parent of the iron-arsenide family of superconductors - known to become superconducting under doping and the application of pressure. The magnetic field and temperature dependences of the oscillations between 20 and 55 T in the liquid helium temperature range suggest that the electronic excitations are those of a Fermi liquid. We show that the observed Fermi surface comprising small pockets is consistent with the formation of a spin-density wave. Our measurements thus demonstrate that high Tc superconductivity can occur on doping or pressurizing a conventional metallic spin-density wave state.
Rezension: Das Buch der Schurken. Die 100 genialsten Bösewichte der Weltliteratur
Creators: name: Wintersteiger, Christina
Publisher: name: Medienimpulse
Year: 2016

description: Medienimpulse, Bd. 54 Nr. 2 (2016): 2/2016 - Internet und digitale Medien als sexualisierte Räume
Rezension: Metapoietische Filme. Über das Filmemachen 'nach' Deleuze
Creators: name: Rogy, Raffaela
Publisher: name: Medienimpulse
Year: 2016

description: Medienimpulse, Bd. 54 Nr. 2 (2016): 2/2016 - Internet und digitale Medien als sexualisierte Räume
Lets talk about ... – SeXtalks 2.0
Creators: name: Kaiser-Müller, Katharina
name: Prochazka, Elke
Publisher: name: Medienimpulse
Year: 2016

description: Medienimpulse, Bd. 54 Nr. 2 (2016): 2/2016 - Internet und digitale Medien als sexualisierte Räume
Warum "20 % von 50 %" 10 Prozent, aber auch 40 Prozent sein können
Creators: name: Wiesner, Patrick
name: Binder, Karin
name: Eberl, Andreas
name: Krauss, Stefan
Publisher: name: Universität Regensburg
Year: 2025
Subjects: subject: 510 Mathematik

description: „20 % von 50 %“ kann entweder als 40 % oder als 10 % interpretiert werden, da die Präposition „von“ je nach Sachsituation als Multiplikation oder Division gedeutet werden muss. Wir begründen beide Interpretationen, die wir mit „Multiplikations-von“ und „Divisions-von“ bezeichnen, mithilfe der Grundgleichung der Prozentrechnung und zeigen, dass eine Eindeutigkeit erst durch den Kontext entsteht. Auch in Visualisierungen wie Baumdiagrammen und Vierfeldertafeln können diese zwei verschiedenen möglichen Bedeutungen sichtbar gemacht werden.
N=5,6 Superconformal Chern-Simons Theories and M2-branes on Orbifolds
Creators: name: Hosomichi, Kazuo
name: Lee, Ki-Myeong
name: Lee, Sangmin
name: Lee, Sungjay
name: Park, Jaemo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore further our recent generalization of the $\mathcal{N}=4$ superconformal Chern-Simons theories of Gaiotto and Witten. We find and construct explicitly theories of enhanced $\mathcal{N}=5$ or 6 supersymmetry, especially $\mathcal{N}=5$, $Sp(2M)\times O(N)$ and $\mathcal{N}=6$, $Sp(2M)\times O(2)$ theories. The $U(M)\times U(N)$ theory coincides with the $\mathcal{N}=6$ theory of Aharony, Bergman, Jafferis and Maldacena (ABJM). We argue that the $\mathcal{N}=5$ theory with $Sp(2N)\times O(2N)$ gauge group can be understood as an orientifolding of the ABJM model with $U(2N)\times U(2N)$ gauge group. We briefly discuss the Type IIB brane construction of the $\mathcal{N}=5$ theory and the geometry of the M-theory orbifold.
description: 24 pages. v2: SUSY of mass deformed theory proven, minor improvements
Emerging ADCs Slides
Creators: Gabriele Manganaro
Publisher: name: IEEE
Year: 2021

Webinar Slides
Abstract: Does innovation in ADC design follow a straight-line progression? Should the pervasive use of figures of merit (FOMs) be encouraged? It is the author's contention that a closer look to the symbiosis between data converters applications and data converter technology suggests a substantially more complex picture deserving attention.
New points in a FOM scatter plot regularly emerge as the result of what designers are working on, which is in?uenced by application and business dynamics. So, the emergence of new points should not be confused as an indication of what converter technology could possibly do in absolute sense. Some level of correlation between technological potential and a FOM trend should not be hastily confused with causation. Worse off, we should be wary of downplaying emerging classes of data converters that do not yet rank as successfully in FOM as established ones. Two emerging ADC classes, the time-domain converters and compressive sampling techniques, are considered as examples of a different view on this topic.

Speaker Bio: Gabriele Manganaro (S'95, M'98, SM'03, F'16) holds a Dr.Eng. and a Ph.D. degree in Electronics from the University of Catania, Italy. Starting in 1994, he did research with ST Microelectronics and at Texas A&M University. He worked in data converters' IC design at Texas Instruments, Engim Inc, and as Design Director at National Semiconductor. Since 2010 to 2020 he was with Analog Devices, first as an Engineering Director for High Speed Data Converters, and subsequently as a Technology Director for the Communication Products Division.
Gabriele joined MediaTek in 2021 as a Director of Technology. He served in the technical sub-committee for Data Converters of the ISSCC for seven consecutive years. He was Associate Editor for IEEE Trans. On Circuits and Systems - Part II and then Associate Editor, Deputy Editor in Chief and finally Editor in Chief for IEEE Trans. On Circuits and Systems - Part I. He is presently the Editor in Chief (2020-21) for the IEEE Open Journal of Circuits and Systems. He authored/co-authored more than 60 peer-reviewed papers, three books (notably "Advanced Data Converters", Cambridge University Press, 2011) and has been granted 18 US patents, with more pending. He was recipient of scientific awards, including the 1995 CEU Award from the Rutherford Appleton Laboratory (UK), the 1999 IEEE Circuits and Systems Outstanding Young Author Award and the 2007 IEEE European Solid-State Circuits Conference Best Paper Award. He is an IEEE Fellow (since 2016), a Fellow of the IET (since 2009), Member of the scientific honor society Sigma Xi, and was a member of the Board of Governors for the IEEE Circuits and Systems Society (2016-2018). Gabriele has received international technical & leadership recognition; he is often invited to speak on technical subjects at key conferences and top universities and developed and taught graduate professional courses in data converters design and mixed-signal design at the University of Oxford (UK).
Can the Existence of Dark Energy Be Directly Detected?
Creators: name: Perl, Martin L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The majority of astronomers and physicists accept the reality of dark energy and also believe that it can only be studied indirectly through observation of the motions of stars and galaxies. In this paper I open the experimental question of whether it is possible to directly detect dark energy through the presence of dark energy density. Two thirds of this paper outlines the major aspects of dark energy density as now comprehended by the astronomical and physics community. The final third summarizes various proposals for direct detection of dark energy density or its possible effects. At this time I do not have a fruitful answer to the question: Can the Existence of Dark Energy Be Directly Detected?
description: 4 pages
#MyGPguide - Visiting your General Practitioner: A guide for young people with lived experience of self-harm and suicidality
Creators: name: Michail, Maria
name: Hunter, Rowmell
name: Mitchell, Lizzie
name: Morgan, James
name: Rathore, Imaan
name: Reid, Kalen
name: Tresadern, Charlie
name: Williams, Beckye
name: Campbell, Niyah
Publisher: name: figshare
Year: 2021
Subjects: subject: 111714 Mental Health
subject: FOS: Health sciences

description: MyGPguide is an evidence-informed resource co-designed with young people for young people with lived experience of self-harm and/or suicidal behaviour to prepare them for their consultation with their General Practitioner (GP) offering vital information and advice on:·· - What to consider before they visit their doctor, including preparing questions and booking an appointment.· - How to manage the consultation, what their rights are with respect to confidentiality, what questions their doctor might ask them; and how to manage discussions about medication, safety planning and referral to mental health services.· - What to do after the consultation and how their doctor can support them including signposting and accessing professional support.
Consultations about self-harm and suicidal thoughts and feelings can be challenging for both GPs and young people. #MyGPguide, offers evidence-based, accessible and practical tips to facilitate the best consultation and support young people at-risk of suicide.
Collective vortex phases in periodic plus random pinning potential
Creators: name: Pogosov, W. V.
name: Misko, V. R.
name: Zhao, H. J.
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study theoretically the simultaneous effect of a regular and a random pinning potentials on the vortex lattice structure at filling factor of 1. This structure is determined by a competition between the square symmetry of regular pinning array, by the intervortex interaction favoring a triangular symmetry, and by the randomness trying to depin vortices from their regular positions. Both analytical and molecular-dynamics approaches are used. We construct a phase diagram of the system in the plane of regular and random pinning strengths and determine typical vortex lattice defects appearing in the system due to the disorder. We find that the total disordering of the vortex lattice can occur either in one step or in two steps. For instance, in the limit of weak pinning, a square lattice of pinned vortices is destroyed in two steps. First, elastic chains of depinned vortices appear in the film; but the vortex lattice as a whole remains still pinned by the underlying square array of regular pinning sites. These chains are composed into fractal-like structures. In a second step, domains of totally depinned vortices are generated and the vortex lattice depins from regular array.
description: 13 pages, 9 figures
Lernen mit Online-Videos – Eine Einführung
Creators: name: Rummler, Klaus
Publisher: name: Medienimpulse
Year: 2017

description: Aus der Perspektive einer kulturwissenschaftlich orientierten, erziehungswissenschaftlichen Medienpädagogik liefert der Beitrag einen Überblick über aktuelle Zugänge und Handlungspraktiken zum Thema Lernen mit Online-Videos. Die Handlungspraxis des Lernens mit Online-Videos wird theoretisch im Dreiecksverhältnis der Sozio-kulturellen Ökologie aus Strukturen, kulturellen Praktiken und Handlungs- bzw. Wirksamkeitskompetenzen verortet. Nach einer Typisierung oder definitorischen Einordnung von Online-Videos wird der Versuch angestellt, das Lernen mit Online-Videos lerntheoretisch zu verorten. Im Anschluss spannt der Beitrag das Thema Lernen mit Videos über die pädagogischen Handlungsfelder Lehramtsausbildung, Berufsausbildung und berufliche Weiterbildung, Hochschuldidaktik und Schulunterricht auf. Abschließend scheint es nötig auch die Grenzen des Lernens mit Online-Videos sowie die Gründe für die Nicht-Nutzung zu diskutieren.
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
Robust Control of Grid-Connected Converters-  A 15 Year Evolutionary Timeline-Slides
Creators: Lennart Harnefors
Publisher: name: IEEE
Year: 2021

PELS Webinar Slides
Abstract:  Achieving stability and good performance of a voltage-source converter (VSC) connected to a weak grid – that is, with a low short-circuit ratio (SCR) – is often challenging. Moreover, it is desirable to use the same controller tuning irrespective of the SCR. This is because the SCR may be varying, perhaps in an unknown way. This objective is called robust control – a well-studied topic in the field of process control. Roughly 15 years ago it was recognized that the conventional method vector current control (VCC) is not robust, as it generally gives unsatisfactory performance for weak grids. Due to the particular system structure, cut-and-dried methods from robust process control are not immediately applicable to converter control. Instead, the problem was circumvented by emulating the dynamics of a synchronous machine, called power-synchronization control (PSC). However, PSC was found to be inferior to VCC for strong grids, that is, neither PSC is robust. In this webinar, we present the key evolutionary steps in which VCC and PSC were robustified to both perform well irrespective of the SCR. The somewhat surprising end result of this process is that the two schemes become near identical and can be unified in a universal controller.
Quantum Holography from Fermion Fields
Creators: name: Zizzi, Paola
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate, in the context of Loop Quantum Gravity, the Quantum Holographic Principle, according to which the area of the boundary surface enclosing a region of space encodes a qubit per Planck unit. To this aim, we introduce fermion fields in the bulk, whose boundary surface is the two-dimensional sphere. The doubling of the fermionic degrees of freedom and the use of the Bogoljubov transformations lead to pairs of spin network's edges piercing the boundary surface with double punctures, giving rise to pixels of area encoding a qubit. The proof is also valid in the case of a fuzzy sphere.
description: 18 pages, 1 figure
Poetik in Trümmern. Historiografie und Poetologie in Nenad Veličkovićs "Der Vater meiner Tochter"
Creators: name: Nagy, Simon
Publisher: name: Medienimpulse
Year: 2017

description: Nenad Veličkovićs Der Vater meiner Tochter verhandelt die Schwierigkeit, im Angesicht übermächtiger historischer Ereignisse eigene Geschichten zu erzählen. Der 2016 von der Autorin Marija Ivanovic ins Deutsche übersetzte Roman reflektiert zugleich auch die Möglichkeiten und Limits narrativer Konzepte. Simon Nagy hat den Text für die MEDIENIMPULSE einer eingehenden Analyse unterzogen.
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
Fortuna. Aus dem Magazin des Glücks
Creators: name: Ballhausen, Thomas
Publisher: name: Medienimpulse
Year: 2017

description: Der Philosoph und Essayist Franz Schuh legt mit "Fortuna" sein "Magazin des Glücks" vor, eine gattungsübergreifende Sammlung aus zeitkritischen Analysen, historisch-autobiografischen Tiefenbohrungen und hellsichtigen Kürzesttexten. Geprägt von einem lyrischen Taktgeber, der humorvoll die Auswahl rhythmisch begleitet, gelingt es Schuh anschaulich zu vergegenwärtigen, was sich an Begriffen, Fragen und Herausforderungen alles unter "Glück" zusammenbringen, ja auch bündeln lässt. Mit denkerischer Leichtigkeit macht er diese Sammlung zum nicht zuletzt auch eindringlichen Leseglück.
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
title: Assessing the priorities for control of animal diseases in Malawi
Creators: name: Kamvazina, Samuel Simon
Publisher: name: The University of Edinburgh
Year: 1982
Subjects: subject: Annexe MSc Digitisation Project 2022 Block 48
subject: Animal disease surveillance
subject: Data collection
subject: Analysis
subject: Disease outbreaks
subject: System improvement

description: The animal disease surveillance system in Malawi was examined and its disease data records were analysed. An outline of objectives for disease data collection was found to be lacking. Three sources of animal disease data, namely: veterinary field stations, veterinary investigation centres and abattoirs; and methods of data collection, namely: field disease investigation, laboratory disease investigation, meat inspection, general disease investigation surveys and special disease epidemiological surveys, were described. The sources of disease data were found to be incapable of providing information for all disease outbreaks in the field. The methods of data collection did not allow collection of adequate disease information to facilitate quantitative, qualitative and economic analysis of disease. Collation of data was found to be unsystematic and storage system was incapable of accommodating large volumes of data for long periods. Proposals to modify and improve the system have been made; in particular, an outline of objectives has been made. Diseases have been re-categorised and additional required information has been described, including logistics to facilitate their collection, collation, storage and analysis.
Contributions of charm anihilation to the hyperfine splitting in charmonium
Creators: name: Levkova, L.
name: DeTar, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In calculations of the hyperfine splitting in charmonium, the contributions of the disconnected diagrams is considered small and is typically ignored. We aim to estimate nonperturbatively the size of the resulting error, which could potentially affect the high precision calculations of the charmonium spectrum. Following our work on the effects of the disconnected diagrams in unquenched QCD presented at Lattice 2007, we study the same problem in the quenched case. On dynamical ensembles the disconnected charmonium propagators contain light modes which complicate the extraction of the signal at large distances. In the fully quenched case, where there are no such light modes, the interpretation of the signal is simplified. We present results from lattices with $a\approx 0.09$ fm and $a\approx 0.063$ fm.
description: 7 pages, 7 figures, talk presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg, Virginia, USA
The role of asymmetries in coronal rain formation during thermal non-equilibrium cycles
Creators: name: Pelouze, Gabriel
name: Auchère, Frédéric
name: Bocchialini, Karine
name: Froment, Clara
name: Mikić, Zoran
name: Soubrié, Elie
name: Voyeux, Alfred
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: Thermal non-equilibrium (TNE) produces several observables that can be used to constrain the spatial and temporal distribution of solar coronal heating. Its manifestations include prominence formation, coronal rain, and long-period intensity pulsations in coronal loops. The recent observation of abundant periodic coronal rain associated with intensity pulsations by Auchère et al. allows to unify these two phenomena as the result of TNE condensation and evaporation cycles. On the other hand, many intensity pulsation events observed by Froment et al. show little to no coronal rain formation. Aims: Our goal is to understand why some TNE cycles produce such abundant coronal rain, while others produce little to no rain. Methods: We reconstruct the geometry of the event reported by Auchère et al., using images from STEREO/SECCHI/EUVI and magnetograms from SDO/HMI. We then perform 1D hydrodynamic simulations of this event, for different heating parameters and variations of the loop geometry (9000 simulations in total). We compare the resulting behaviour to simulations of TNE cycles by Froment et al. that do not produce coronal rain. Results: Our simulations show that both prominences and TNE cycles (with and without coronal rain) can form within the same magnetic structure. We show that the formation of coronal rain during TNE cycles depends on the asymmetry of the loop and of the heating. Asymmetric loops are overall less likely to produce coronal rain, regardless of the heating. In symmetric loops, coronal rain forms when the heating is also symmetric. In asymmetric loops, rain forms only when the heating compensates the asymmetry.
description: Accepted for publication in A&A. 15 pages, 8 figures
РОЛЬ ПЕДАГОГА В ПОДГОТОВКЕ КАДРОВ
Creators: name: Даминова, Рано
Publisher: name: Zenodo
Year: 2025

description: Педагогическое мастерство может рассматриваться как идеал эффективности педагогической, деятельности. Педагогическое мастерство- важнейшее профессиональное качество личности учителя и воспитателя. Основными темами алгоритма являются: построение практических занятий, формирование способностей, культура речи, научность и индивидуальность.
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Gilbert, Seth
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2021
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Software and its engineering → Distributed systems organizing principles
subject: Computing methodologies → Distributed computing methodologies
subject: Computing methodologies → Concurrent computing methodologies
subject: Hardware → Fault tolerance
subject: Networks
subject: Information systems → Data structures
subject: Theory of computation
subject: Theory of computation → Models of computation
subject: Theory of computation → Design and analysis of algorithms

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 209, 35th International Symposium on Distributed Computing (DISC 2021), pages 0:i-0:xxii
Die fürchterlichen Tage des schrecklichen Grauens
Creators: name: Rogy, Raffaela
Publisher: name: Medienimpulse
Year: 2017

description: "Das schreckliche Grauen" soll der Horrorfilm heißen, den eine Gruppe aus Ulm verwirklichen möchte. Statt der filmischen Umsetzung finden Sitzungen über die eigenen Ängste und Wanderungen durch die freie Wildbahn statt. Roman Ehrlich verwebt in seinem aktuellen Roman "Die fürchterlichen Tage des schrecklichen Grauens" Perspektiven der Angst, des Schrecklichen, des Alltags, der Realität sowie der Fiktion miteinander.
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
title: Geology of Kaitangata Coalfield
Creators: name: Harrington, Horacio Jaime
Publisher: name: Department of Scientific and Industrial Research
Year: 1958

description: The bulletin describes the results of a detailed survey of the stratigraphy and structure of Kaitangata Coalfield, which lies north of the mouth of Clutha River and 50 miles south-west of Dunedin. (The author)
Journal der Bilder und Einbildungen
Creators: name: Ballhausen, Thomas
Publisher: name: Medienimpulse
Year: 2017

description: Der österreichische Lyriker Helwig Brunner legt mit seinem "Journal" eine Edition präziser Beobachtungen vor, die ein Jahrzehnt des Lesens, Schreibens und Analysierens aufschlüsseln. In essayistischem Tonfall adressiert Brunner meisterhaft die sprachlichen Grundlagen unserer Wahrnehmung und unseres (Miss-)Verstehens. Sein Buch ist ein Wunderwerk des Findens und Erfindens, der "Bilder und Einbildungen".
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
Ultra-Compact Dwarf Candidates Near the Lensing Galaxy in Abell S0740
Creators: name: Blakeslee, John P.
name: DeGraaff, Regina Barber
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze three-band HST/ACS imaging data of the giant elliptical galaxy ESO325-G004. This is the nearest known strongly lensing galaxy, and it resides in the center of the poor cluster Abell S0740 at redshift z=0.034. Based on magnitude, color, and size selection criteria, we identify a sample of 15 ultra-compact dwarf (UCD) galaxy candidates within the ACS field. This is comparable to the numbers of UCDs found within similar regions in more nearby clusters (Virgo, Fornax, Hydra). We estimate circular half-light radii R_e,c from 2-D Sersic and King model fits and apply an upper cutoff of 100pc for our UCD selection. The selected galaxies have typical Sersic indices $n\approx1.5$, while larger sources with R_e,c > 100pc are more nearly exponential, perhaps indicating that the latter are dominated by background disk galaxies. Many of the UCD candidates are surrounded by a faint "fuzz" of halo light, which may be the remnants of stripped material, and there is some evidence for intrinsic flattening of the UCDs themselves. An apparent separation in size between the most compact UCDs with R_e,c < 17pc and larger ones with R_e,c > 40pc may hint at different formation mechanisms. We do not find any M32 analogues in this field. The colors of the UCD candidates span the range from blue to red globular clusters, although the brightest ones are predominantly red. The UCD candidates follow the flattened, elliptical distribution of the globular clusters, which in turn follow the galaxy halo light, suggesting a common evolution for these three components. Follow-up spectroscopy can determine which candidates are truly members of Abell S0740 and how similar they are in distribution to the globulars.
description: 12 pages, emulateapj format. Accepted for publication in AJ, December 2008 edition
Degrees of riskiness, falsifiability, and truthlikeness. A neo-Popperian account applicable to probabilistic theories
Creators: name: Vignero, Leander
name: Wenmackers, Sylvia
Publisher: name: arXiv
Year: 2021
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Artificial Intelligence (cs.AI)
subject: Information Theory (cs.IT)
subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this paper, we take a fresh look at three Popperian concepts: riskiness, falsifiability, and truthlikeness (or verisimilitude) of scientific hypotheses or theories. First, we make explicit the dimensions that underlie the notion of riskiness. Secondly, we examine if and how degrees of falsifiability can be defined, and how they are related to various dimensions of the concept of riskiness as well as the experimental context. Thirdly, we consider the relation of riskiness to (expected degrees of) truthlikeness. Throughout, we pay special attention to probabilistic theories and we offer a tentative, quantitative account of verisimilitude for probabilistic theories.
description: 41 pages; 3 figures; accepted for publication in Synthese
Cooling of Dense Gas by H2O Line Emission and an Assessment of its Effects in Chondrule-Forming Shocks
Creators: name: Morris, M. A.
name: Desch, S. J.
name: Ciesla, F. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider gas at densities appropriate to protoplanetary disks and calculate its ability to cool due to line radiation emitted by H2O molecules within the gas. Our work follows that of Neufeld & Kaufman (1993; ApJ, 418, 263), expanding on their work in several key aspects, including use of a much expanded line database, an improved escape probability formulism, and the inclusion of dust grains, which can absorb line photons. Although the escape probabilities formally depend on a complicated combination of optical depth in the lines and in the dust grains, we show that the cooling rate including dust is well approximated by the dust-free cooling rate multiplied by a simple function of the dust optical depth. We apply the resultant cooling rate of a dust-gas mixture to the case of a solar nebula shock pertinent to the formation of chondrules, millimeter-sized melt droplets found in meteorites. Our aim is to assess whether line cooling can be neglected in chondrule-forming shocks or if it must be included. We find that for typical parameters, H2O line cooling shuts off a few minutes past the shock front; line photons that might otherwise escape the shocked region and cool the gas will be absorbed by dust grains. During the first minute or so past the shock, however, line photons will cool the gas at rates ~ 10,000 K/hr, dropping the temperature of the gas (and most likely the chondrules within the gas) by several hundred K. Inclusion of H2O line cooling therefore must be included in models of chondrule formation by nebular shocks.
description: Accepted for publication in The Astrophysical Journal
FAIR data assessment tools: an evaluation
Creators: name: Ammar, Ammar
Publisher: name: Zenodo
Year: 2021
Subjects: FAIR, Data Reusability, Tool assessment, FAIR Evaluation, Improve FAIR

description: In close collaboration with the National Institute for Public Health and the Environment (RIVM), Ammar Ammar (Maastricht University) contributed to a study in which several FAIR assessment tools are evaluated based on criteria specifically designed for this study. During this Data Trail workshop, he presented the main work of his upcoming paper on this topic. https://web.archive.org/web/20211118153435/https://dans.knaw.nl/en/agenda/dans-data-trail-workshop-fair-data-assessment-tools-an-evaluation/
The effect of two types of protein, supplementary methionine and dietary cholesterol on plasma and liver cholesterol levels
Creators: name: Craig, Rosemary Eleanor Anne
Publisher: name: University of British Columbia
Year: 2010

description: High serum cholesterol levels have been identified as an important risk factor for atherosclerosis in humans. The purpose of this study was to investigate the effect of protein quality and quantity and dietary cholesterol supplementation on plasma and liver cholesterol levels, using a rat model. Male Wistar rats, weighing approximately 150 g, were fed ad libitum, with food intakes recorded daily and body weights weekly. At the end of six weeks, plasma and liver samples were collected and analyzed enzymatically for cholesterol content. Dietary protein was fed at levels of 10%, 15% and 20%, using peanut protein, peanut protein with methionine and casein. Methionine was added to one group of peanut protein diets to increase the amount of this amino acid to the same level as is found in a casein diet of equivalent protein quantity. Cholesterol was fed to three diet, groups: 20% peanut protein, peanut protein with methionine, and casein. Rats were also fed a laboratory chow diet to evaluate the effect of time on their tissue cholesterol levels. The results reveal no significant effect of protein quality on plasma cholesterol and only at 15% and 20% protein levels does liver cholesterol increase with improvements in protein quality. Time and the amount of protein in the diet, whether casein or peanut protein, had no effect on plasma and liver cholesterol levels although a trend revealed by Pearson correlation analysis showed a negative correlation between plasma cholesterol and peanut protein, and a positive correlation between plasma and liver cholesterol and casein. The effect of protein on tissue cholesterol appeared to be a minor one in comparison with the effect of dietary cholesterol, although accumulation of cholesterol in the livers of rats fed diets containing cholesterol could be decreased by dietary methionine.
On coproducts in varieties, quasivarieties and prevarieties
Creators: name: Bergman, George M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 08B25, 08B26, 08C15 (Primary)

description: If the free algebra F on one generator in a variety V of algebras (in the sense of universal algebra) has a subalgebra free on two generators, must it also have a subalgebra free on three generators? In general, no; but yes if F generates the variety V. Generalizing the argument, it is shown that if we are given an algebra and subalgebras, A_0\supseteq ... \supseteq A_n, in a prevariety (SP-closed class of algebras) P such that A_n generates P, and also subalgebras B_i\subseteq A_{i-1} (00 the subalgebra of A_{i-1} generated by A_i and B_i is their coproduct in P, then the subalgebra of A generated by B_1, ..., B_n is the coproduct in P of these algebras. Some further results on coproducts are noted: If P satisfies the amalgamation property, one has the stronger "transitivity" statement: if A has a finite family of subalgebras (B_i)_{i\in I} such that the subalgebra of A generated by the B_i is their coproduct, and each B_i has a finite family of subalgebras (C_{ij})_{j\in J_i} with the same property, then the subalgebra of A generated by all the C_{ij} is their coproduct. For P a residually small prevariety or an arbitrary quasivariety, relationships are proved between the least number of algebras needed to generate P as a prevariety or quasivariety, and behavior of the coproduct operation in P. It is shown by example that for B a subgroup of the group S = Sym(Ω) of all permutations of an infinite set Ω, the group S need not have a subgroup isomorphic over B to the coproduct with amalgamation S \cP_B S. But under weak additional hypotheses on B, the question remains open.
description: 20 pages. Copy at http://math.berkeley.edu/~gbergman/papers may be updated more frequently than arXiv copy
Poetik der Alterität. Fragile Identitätskonstruktionen in der Literatur zeitgenössischer Autorinnen
Creators: name: Wintersteiger, Christina
Publisher: name: Medienimpulse
Year: 2017

description: Gibt es eine Poetik der Alterität? Ausgehend von der Prämisse, dass Kultur und Schreibweise zusammenhängen, macht sich Andrea Horváth auf eine literarische Spurensuche nach der Beschaffenheit einer Poetik des "Andersseins", die sie in Texten zeitgenössischer Autorinnen, deren Werke Themen wie kulturelle Fremdheit, Migrations- und Grenzerfahrungen und gender-bezogene Diskurse wie Sexualität verhandeln, ausmacht. Sich auf die theoretischen Modelle sowohl der Gender als auch der Postcolonial Studies beziehend, erörtert die Autorin anhand von zehn partikularen Analysen und Lektürebeispielen die spezifisch poetologischen Mechanismen, mit denen das "Andere" beschrieben werden soll und dabei dekonstruiert wird. Sie zeigt damit, dass die Unmöglichkeit, Alterität zu repräsentieren, nicht zuletzt in der formalen Gestaltung der Texte reflektiert wird.
description: Medienimpulse, Bd. 55 Nr. 2 (2017): 2/2017 - Digitale Grundbildung
A convolution estimate for two-dimensional hypersurfaces
Creators: name: Bejenaru, Ioan
name: Herr, Sebastian
name: Tataru, Daniel
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B35, 47B38

description: Given three transversal and sufficiently regular hypersurfaces in R^3 it follows from work of Bennett-Carbery-Wright that the convolution of two L^2 functions supported of the first and second hypersurface, respectively, can be restricted to an L^2 function on the third hypersurface, which can be considered as a nonlinear version of the Loomis-Whitney inequality. We generalize this result to a class of C^{1,beta} hypersurfaces in R^3, under scaleable assumptions. The resulting uniform L^2 estimate has applications to nonlinear dispersive equations.
description: 21 pages, 1 figure
Robust large-gap topological insulator phase in transition-metal chalcogenide ZrTe$_4$Se
Creators: name: Wang, Xing
name: Wan, Wenhui
name: Ge, Yanfeng
name: Liu, Yong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Based on density functional theory (DFT), we investigate the electronic properties of bulk and single-layer ZrTe$_4$Se. The band structure of bulk ZrTe$_4$Se can produce a semimetal-to-topological insulator (TI) phase transition under uniaxial strain. The maximum global band gap is 0.189 eV at the 7\% tensile strain. Meanwhile, the Z$_2$ invariants (0; 110) demonstrate conclusively it is a weak topological insulator (WTI). The two Dirac cones for the (001) surface further confirm the nontrivial topological nature. The single-layer ZrTe$_4$Se is a quantum spin Hall (QSH) insulator with a band gap 86.4 meV and Z$_2$=1, the nontrivial metallic edge states further confirm the nontrivial topological nature. The maximum global band gap is 0.211 eV at the tensile strain 8\%. When the compressive strain is more than 1\%, the band structure of single-layer ZrTe$_4$Se produces a TI-to-semimetal transition. These theoretical analysis may provide a method for searching large band gap TIs and platform for topological nanoelectronic device applications.
description: 13 pages,8 figures
Hidden order in bosonic gases confined in one dimensional optical lattices
Creators: name: Amico, L.
name: Mazzarella, G.
name: Pasini, S.
name: Cataliotti, F. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the effective Hamiltonian arising from a suitable power series expansion of the overlap integrals of Wannier functions for confined bosonic atoms in a 1d optical lattice. For certain constraints between the coupling constants, we construct an explicit relation between such an effective bosonic Hamiltonian and the integrable spin-$S$ anisotropic Heisenberg model. Therefore the former results to be integrable by construction. The field theory is governed by an anisotropic non linear $σ$-model with singlet and triplet massive excitations; such a result holds also in the generic non-integrable cases. The criticality of the bosonic system is investigated. The schematic phase diagram is drawn. Our study is shedding light on the hidden symmetry of the Haldane type for one dimensional bosons.
description: 5 pages; 1 eps figure. Revised version, to be published in New. J. Phys
Aspects of Unparticle Physics
Creators: name: Rajaraman, Arvind
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review some theoretical and experimental issues in unparticle physics, focusing mainly on collider signatures.
description: 4 pages, latex. Based on talk at ICHEP08
Observer Dependent Horizon Temperatures: a Coordinate-Free Formulation of Hawking Radiation as Tunneling
Creators: name: Stotyn, Sean
name: Schleich, Kristin
name: Witt, Don
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We reformulate the Hamilton-Jacobi tunneling method for calculating Hawking radiation in static, spherically-symmetric spacetimes by explicitly incorporating a preferred family of frames. These frames correspond to a family of observers tied to a locally static timelike Killing vector of the spacetime. This formulation separates the role of the coordinates from the choice of vacuum and thus provides a coordinate-independent formulation of the tunneling method. In addition, it clarifies the nature of certain constants and their relation to these preferred observers in the calculation of horizon temperatures. We first use this formalism to obtain the expected temperature for a static observer at finite radius in the Schwarzschild spacetime. We then apply this formalism to the Schwarzschild-de Sitter spacetime, where there is no static observer with 4-velocity equal to the static timelike Killing vector. It is shown that a preferred static observer, one whose trajectory is geodesic, measures the lowest temperature from each horizon. Furthermore, this observer measures horizon temperatures corresponding to the well-known Bousso-Hawking normalization.
description: 11 pages, 1 2-part figure, references added, appendix added, discussion streamlined
Free Fermionic Heterotic Model Building and Root Systems
Creators: name: Robinson, M.
name: Cleaver, G.
name: Hunziker, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider an alternative derivation of the GSO Projection in the free fermionic construction of the weakly coupled heterotic string in terms of root systems, as well as the interpretation of the GSO Projection in this picture. We then present an algorithm to systematically and efficiently generate input sets (i.e. basis vectors) in order to study Landscape statistics with minimal computational cost. For example, the improvement at order 6 is approximately 10^{-13} over a traditional brute force approach, and improvement increases with order. We then consider an example of statistics on a relatively simple class of models.
description: Standard Latex, 12 pages
Ratio sets of random sets
Creators: name: Cilleruelo, Javier
name: Guijarro-Ordonez, Jorge
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We study the typical behavior of the size of the ratio set $A/A$ for a random subset $A\subset \{1,\dots , n\}$. For example, we prove that $|A/A|\sim \frac{2\text{Li}_2(3/4)}{π^2}n^2 $ for almost all subsets $A \subset\{1,\dots ,n\}$. We also prove that the proportion of visible lattice points in the lattice $A_1\times\cdots \times A_d$, where $A_i$ is taken at random in $[1,n]$ with $\mathbb P(m\in A_i)=α_i$ for any $m\in [1,n]$, is asymptotic to a constant $μ(α_1,\dots,α_d)$ that involves the polylogarithm of order $d$.
Pedal coordinates and free double linkage
Creators: name: Blaschke, Petr
name: Blaschke, Filip
name: Blaschke, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Using the technique of pedal coordinates we investigate the orbits of a free double linkage. We provide a geometrical construction for them and also show a surprising connection between this mechanical system and orbits around a Black Hole and solutions of Dark Kepler problem.
CIFRA National Survey: Uruguay September 1996
Creators: name: CIFRA, In Bogliaccini, Juan, And Queirolo Rosario Laboratorio De Opinión Pública And Redes Sociales En Uruguay Collection (Social Networks And Public Opinion Lab Collection)
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Total population: most important values in various people (politician, boss, friend, partner); approval of various political figures and groups; Mercosur (1991 South American trade bloc); rate kindness of political figures; Uruguay economy; Partido Nacional (National Party) vs. Encuentro Progresista (Frente Amplio) (Broad Front) vs. Partido Colorado (Colorado Party) (current party, elected 1994); “love is blind” saying; characteristics of a happy couple; family economic situation; public education quality; rate aspects of Uruguay education system; education reforms; do your children attend public or private school; rate various South American peoples ability to inspire; democracy in Uruguay; political corruption; dedication to religion; satisfaction with life; interest in politics; reform to repeal retirement system; Alberto Volonté or Tabaré Vázquez preference for 1994 president; 1989 voting history; 1994 voting history. Montevideo: where do you go when you need a doctor; current medication; monthly medical fees payment. National Agency for Research and Innovation (ANII) Collection
Multilevel effects in the Rabi oscillations of a Josephson phase qubit
Creators: name: Dutta, S. K.
name: Strauch, Frederick W.
name: Lewis, R. M.
name: Mitra, Kaushik
name: Paik, Hanhee
name: Palomaki, T. A.
name: Tiesinga, Eite
name: Anderson, J. R.
name: Dragt, Alex J.
name: Lobb, C. J.
name: Wellstood, F. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present Rabi oscillation measurements of a Nb/AlOx/Nb dc superconducting quantum interference device (SQUID) phase qubit with a 100 um^2 area junction acquired over a range of microwave drive power and frequency detuning. Given the slightly anharmonic level structure of the device, several excited states play an important role in the qubit dynamics, particularly at high power. To investigate the effects of these levels, multiphoton Rabi oscillations were monitored by measuring the tunneling escape rate of the device to the voltage state, which is particularly sensitive to excited state population. We compare the observed oscillation frequencies with a simplified model constructed from the full phase qubit Hamiltonian and also compare time-dependent escape rate measurements with a more complete density-matrix simulation. Good quantitative agreement is found between the data and simulations, allowing us to identify a shift in resonance (analogous to the ac Stark effect), a suppression of the Rabi frequency, and leakage to the higher excited states.
description: 14 pages, 9 figures; minor corrections, updated references