cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Switching between seismic and seismo-acoustic harmonic tremor simulated in the laboratory: Insights into the role of open degassing channels and magma viscosity
Creators: name: Lyons, J.J.
name: Lees, J.M.
name: Ichihara, M.
name: Kurokawa, A.
Publisher: name: Blackwell Publishing Ltd
Year: 2013

description: Switching between seismic-only harmonic tremor (SHT) and seismo-acoustic harmonic tremor (SAHT) has been reported at few volcanoes worldwide, but its occurrence may indicate important changes in shallow conduit conditions. Switching was simulated in a laboratory experiment in which harmonic signals were produced with a flow-driven valve and compressed air. The harmonic signals were passed through a tank of shear-thinning viscoelastic fluid, and the resulting signals were recorded. At high fluid stiffness, a stable, open conduit was produced, and the harmonic signals generated within the experimental apparatus were efficiently transmitted into the atmosphere. At lower fluid stiffness, bubbling dominated the activity, stable pathways were not generated in the fluid, and HT was not recorded in the atmosphere. These results are compared to observations of switching at Fuego volcano, Guatemala. We conclude that at intermediate magma viscosities, the development of stable degassing pathways open to the atmosphere will allow HT generated in the conduit to be transmitted into the atmosphere. Further, subtle changes in magma properties and supply rate may control whether SHT or SAHT is recorded, providing information about the state of the shallow conduit and vent at active volcanoes. Key Points Seismic and acoustic harmonic tremor analogues were generated in the lab Atmospheric signals were recorded when channels opened in the viscoelastic fluid Magma viscosity is associated with SHT - SAHT switching at active volcanoes
All face 2-colorable d-angulations are Grünbaum colorable
Creators: name: Lawrencenko, Serge
name: Magomedov, Abdulkarim M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Combinatorics (math.CO)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 05C15

description: A $d$-angulation of a surface is an embedding of a 3-connected graph on that surface that divides it into $d$-gonal faces. A $d$-angulation is said to be Grünbaum colorable if its edges can be $d$-colored so that every face uses all $d$ colors. Up to now, the concept of Grünbaum coloring has been related only to triangulations ($d = 3$), but in this note, this concept is generalized for an arbitrary face size $d \geqslant 3$. It is shown that the face 2-colorability of a $d$-angulation $P$ implies the Grünbaum colorability of $P$. Some wide classes of triangulations have turned out to be face 2-colorable.
description: 7 pages
title: Analyse der Erfolgsfaktoren von Digital Leadership vor dem Hintergrund des Generationenwandels
Creators: name: Ritter, Martina
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 658 Allgemeines Management

description: Die Digitalisierung prägt die moderne Arbeitswelt mit neuen Technologien und Kommunikationsmitteln. Nicht zuletzt durch die Coronapandemie haben sich neue Arbeitskonzepte, wie zum Beispiel Homeoffice, durchgesetzt. Ein weiterer Aspekt, der die Arbeitswelt beschäftigt, sind verschiedene Generationen von MitarbeiterInnen mit ihren unterschiedlichen Prägungen und Bedürfnissen. Das wissenschaftliche Ziel dieser Arbeit ist es, die Erfolgsfaktoren von Digital Leadership unter Berücksichtigung der Führung verschiedener Generationen zu analysieren. Der Forschungsbedarf basiert auf einer umfassenden Literaturrecherche. Neben der Analyse und Darlegung der Literatur im theoretischen Teil dieser Arbeit wurden im empirischen Teil qualitative ExpertInneninterviews durchgeführt und mittels einer inhaltlich strukturierenden Inhaltsanalyse ausgewertet. Die Forschungsergebnisse zeigen, dass keine grundlegend neuen Führungsinstrumente vor dem Hintergrund der Digitalisierung und der Führung verschiedener Generationen notwendig sind. Besonders eine auf die individuellen Bedürfnisse der MitarbeiterInnen angepasste Kommunikation unter Anwendung neuer digitaler Kommunikationstechnologien stellt einen Erfolgsfaktor dar. Basierend auf Vertrauen und der Förderung von Selbstverwaltung und Selbstorganisation können MitarbeiterInnen auch bei der Anwendung neuer Arbeitskonzepte, wie z.B. Homeoffice, effizient geführt werden. Ein überwiegend demokratischer Führungsstil stellt dafür eine Voraussetzung dar und kommt besonders MitarbeiterInnen jüngerer Generationen entgegen. Die Führungskraft agiert dabei immer öfter als Coach. Kenntnisse der generationenspezifischen Eigenschaften sind bei der Anwendung der Führungsinstrumente hilfreich, jedoch nicht erfolgskritisch. Vielmehr ist die Führung von MitarbeiterInnen auf Basis ihrer individuellen Eigenschaften und Bedürfnissen ein Erfolgsfaktor. In Zukunft werden neue digitale Technologien und auch der Einsatz von Homeoffice Führungskräfte weiterhin bei der Ausübung ihrer Führungstätigkeit begleiten. Während ältere Generationen mit der Zeit vollständig in den Ruhestand wechseln, nehmen neue Generationen ihren Platz ein. Der längerfristige oder auch der ausschließliche Einsatz von Homeoffice und eine neue Generationenzusammensetzung in der Arbeitswelt könnte Gegenstand neuer Forschungen sein.
FAIRly connected - Ressourcen vernetzen
Creators: name: Burger, Felix
Publisher: name: Zenodo
Year: 2022
Subjects: Metadatenqualität, Persistent Identifier, PID, DOI, DataCite

description: Damit eine veröffentlichte Ressource die FAIR-Prinzipien erfüllen kann, bedarf es qualitativ hochwertiger Metadaten, welche nicht nur die Ressource selbst, sondern auch mit ihr in Verbindung stehende Objekte beschreiben. Diese Verknüpfungen werden vom Poster anhand des DataCite-Metadatenschemas dargestellt. Der Fokus liegt hierbei auf dem Property "relatedIdentifier". Mittels ausgewählter Beispiele werden die FAIR-Kategorien illustriert und Anregungen geliefert, sowie exemplarische Herausforderungen und Fragestellungen bei der DOI-Metadatenvergabe vorgestellt.
Fragebogen zur Evaluation von Flipped Classroom Lehrveranstaltungen (FLIPPY)
Creators: name: Weber, Michael
name: Gebhardt, Markus
Publisher: name: Universität Regensburg
Year: 2022
Subjects: subject: Flipped Classroom, Inverted Classroom, Hochschule, Vorlesung, Evaluation
subject: 370 Erziehung, Schul- und Bildungswesen

description: Dieser Fragebogen dient der Evaluation von Lehrveranstaltungen im Rahmen der Hochschule, die nach dem Lehrkonzept des Flipped Classroom aufgebaut sind. Der Fragebogen zielt auf die Befragung von Studierenden während oder nach Abschluss einer Lehrveranstaltung ab und besteht aus sechs Dimensionen: (1) Vor- und Nachbereitung, (2) Lernerfahrung, (3) Arbeitsaufwand, (4) Flexibilität, (5) Kollaboratives Lernen und (6) Lehrperson. Die erste Dimension der Vor- und Nachbereitung zielt auf die Vorbereitungsphase des Flipped Classroom ab. Der Fragebogen kann einzeln oder im direkten Vergleich zu traditionellen Vorlesungen verwendet werden. Nachfolgend sind die einzelnen Items sowie zugehörige Kürzel und die Kennwerte der ersten Evaluation dargestellt.
(500314) Charles Webb
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Tilt prior to explosions and the effect of topography on ultra-long-period seismic records at Fuego volcano, Guatemala
Creators: name: Waite, G.P.
name: Lees, J.M.
name: Ichihara, M.
name: Lyons, J.J.
Publisher: name: Blackwell Publishing Ltd
Year: 2012

description: Ground tilt is measured from broadband seismic records prior to frequent explosions at Fuego volcano, Guatemala. We are able to resolve tilt beginning 20-30 minutes prior to explosions, followed by a rapid reversal in deformation coincident with explosion onsets. The tilt amplitude and polarity recorded on the horizontal channels vary from station to station such that the steep and unusual topography of the upper cone of Fuego appears to affect the ultra-long-period signals. We account for the effect of topography and attempt to constrain the tilt source depth and geometry through finite-difference modeling. The results indicate a shallow spherical pressure source, and that topography must be considered when attempting to model tilt sources at volcanoes with steep topography. The tilt signals are interpreted as pressurization of the shallow conduit beneath a crystallized plug followed by elastic deflation concurrent with explosive pressure release.
(500242) William Nevill[e]
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Ensuring the safe and ethical use of sensitive data
Creators: name: Wiltshire, Deborah
Publisher: name: Zenodo
Year: 2023
Subjects: secure data access

description: In recent years ever-increasing amounts of data has become available. This has great potential for society but is not without legal and ethical challenges.  Secure Data Centers regularly face the often-difficult balancing act of greater data access and greater potential for risk and have developed strong security models and frameworks for ensuring the safe, legal and ethical use of sensitive, potentially disclosive data.  This talk gives an overview of the legal and ethical challenges while introducing key security models, and the lessons learnt from secure data access. It will wrap up with a discussion of some of the newly emerging challenges. 
(500247) William Varney
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Error analysis for space and time discretizations of quasilinear wave-type equations
Creators: name: Maier, Bernhard
Publisher: name: Karlsruhe
Year: 2020
Subjects: numerical analysis
quasilinear wave-type equations
abstract error analysis
a priori error estimates
nonconforming space discretization
full discretization
implicit midpoint rule
leapfrog scheme
Westervelt equation
Maxwell equations
Kerr nonlinearity

description: This thesis provides a unified framework for the error analysis for space and time discretizations of a quite general class of quasilinear wave-type problems. For the space discretization we prove a rigorous error estimate based on semigroup theory for nonautonomous problems. Compared to previous results, which are mostly based on Banach’s fixed-point theorem, this approach allows for a better insight into the individual error contributions. Furthermore, since wellposedness results for quasilinear wave-type problems are in general based on severe regularity assumptions with respect to the boundary of the domain, we consider nonconforming space discretizations in order to allow for domain approximation. Furthermore, we provide a rigorous error analysis for the full discretization with three different one-step time-integration schemes. On the one hand, we consider the implicit midpoint rule and a linearized version thereof. On the other hand, we also investigate the leapfrog scheme, which is an explicit scheme. Throughout this thesis, we illustrate the relevance of the abstract framework by application of our results to the undamped Westervelt equation and the Maxwell equations with Kerr nonlinearity. Finally, we conclude with numerical examples.
Galaxy gas flows inferred from a detailed, spatially resolved metal budget
Creators: name: Belfiore, F.
name: Maiolino, R.
name: Bothwell, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the most extensive integral field spectroscopic map of a local galaxy, NGC 628, combined with gas and stellar mass surface density maps, to study the distribution of metals in this galaxy out to 3 effective radii ($\rm R_e$). At each galactocentric distance, we compute the metal budget and thus constrain the mass of metals lost. We find that in the disc about 50% of the metals have been lost throughout the lifetime of the galaxy. The fraction of metals lost is higher in the bulge ($\sim$70%) and decreases towards the outer disc ($\rm \sim 3 \ R_e$). In contrast to studies based on the gas kinematics, which are only sensitive to ongoing outflow events, our metal budget analysis enables us to infer the average outflow rate during the galaxy lifetime. By using simple physically motivated models of chemical evolution we can fit the observed metal budget at most radii with an average outflow loading factor of order unity, thus clearly demonstrating the importance of outflows in the evolution of disc galaxies of this mass range ($\rm log(M_\star/M_\odot) \sim 10)$. The observed gas phase metallicity is higher than expected from the metal budget and suggests late-time accretion of enriched gas, likely raining onto the disc from the metal-enriched halo.
description: accepted by MNRAS. New appendix describing the assumptions, timescales and equilibrium states of different `bathtub' models
Overlapping Communities Detection via Measure Space Embedding
Creators: name: Kozdoba, Mark
name: Mannor, Shie
Publisher: name: arXiv
Year: 2015
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We present a new algorithm for community detection. The algorithm uses random walks to embed the graph in a space of measures, after which a modification of $k$-means in that space is applied. The algorithm is therefore fast and easily parallelizable. We evaluate the algorithm on standard random graph benchmarks, including some overlapping community benchmarks, and find its performance to be better or at least as good as previously known algorithms. We also prove a linear time (in number of edges) guarantee for the algorithm on a $p,q$-stochastic block model with $p \geq c\cdot N^{-\frac{1}{2} + ε}$ and $p-q \geq c' \sqrt{p N^{-\frac{1}{2} + ε} \log N}$.
Finite-difference time-domain modeling of transient infrasonic wavefields excited by volcanic explosions
Creators: name: Lees, J.M.
name: Kim, K.
Publisher: name: Blackwell Publishing Ltd
Year: 2011

description: Numerical modeling of waveform diffractions along the rim of a volcano vent shows high correlation to observed explosion signals at Karymsky Volcano, Kamchatka, Russia. The finite difference modeling assumed a gaussian source time function and an axisymmetric geometry. A clear demonstration of the significant distortion of infrasonic wavefronts was caused by diffraction at the vent rim edge. Data collected at Karymsky in 1997 and 1998 were compared to synthetic waveforms and variations of vent geometry were determined via grid search. Karymsky exhibited a wide range of variation in infrasonic waveforms, well explained by the diffraction, and modeled as changing vent geometry. Rim diffraction of volcanic infrasound is shown to be significant and must be accounted for when interpreting source physics from acoustic observations.
Adinkras, 0-branes, Holoraumy and the SUSY QFT/QM Correspondence
Creators: name: Calkins, Mathew
name: Gates, D. E. A.
name: Gates, S. James
name: Stiffler, Kory
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose the recently defined "Holoraumy Tensor" to play a critical role in defining a metric to establish a correspondence between 4D, N-extended 0-brane-based valise supermultiplet representations and, correspondingly via "SUSY Holography," on the space of 1D, 4N-extended network-based adinkras. Using an analogy with the su(3) algebra, it is argued the 0-brane holoraumy tensors plays the role of the "d-coefficients" and provides a newly established tool for investigating supersymmetric representation theory.
description: 43 pages, 9 figures, LaTeX twice (revision includes analogy between d-coefficients and holoraumy tensors)
title: Ertragsteuerliche Auswirkungen der Ökosozialen Steuerreform 2022 auf österreichische PrivatanlegerInnen von Kryptowährungen
Creators: name: Wedenig, Philipp
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 343 Wehrrecht, Steuerrecht, Wirtschaftsrecht

description: Die ertragsteuerliche Behandlung von Kryptowährungen hat aufgrund der fehlenden Rechtsvorschriften bislang zu Rechtsunsicherheiten für InvestorInnen geführt. Der Gesetzgeber hat durch die Ökosoziale Steuerreform 2022 erstmalig Regelungen geschaffen, welche die Besteuerung von Kryptowährungen im Detail behandeln. Die Neuartigkeit dieser Regelungen sowie die geringen Praxiserfahrungen zeigen die Notwendigkeit einer näheren Betrachtung dieser Thematik. Der wissenschaftliche Nutzen vorliegender Masterarbeit besteht darin, die ertragsteuerlichen Auswirkungen der Ökosozialen Steuerreform 2022 auf österreichische PrivatanlegerInnen von Kryptowährungen zu beleuchten. Im theoretischen Teil wurde die relevante Fachliteratur zum Thema Kryptowährungen inklusive zentraler Fachbegriffe analysiert. Im Fokus stand die Betrachtung der neuen Rechtsvorschriften für die Besteuerung von Kryptowährungen. Die sich daraus ergebenen Unklarheiten sowie Stolperfallen für PrivatanlegerInnen von Kryptowährungen wurden dargelegt. Aufbauend auf der theoretischen Reflexion wurden mit Hilfe von leitfadengestützten Interviews Erfahrungswerte sowie Fachkenntnisse der befragten ExpertInnen erhoben. Die Forschungsergebnisse zeigen, dass der Systemwechsel bei der Besteuerung von Kryptowährungen große Auswirkungen auf österreichische PrivatanlegerInnen hat; beginnend mit der Definition von Kryptowährungen iSd § 27b Abs 4 EStG, die Fragen offenlässt und steuerliche Beurteilungen erschwert. Daneben auch die verspätete KESt-Abzugsverpflichtung, wodurch PrivatanlegerInnen ihre Einkünfte aus Kryptowährungen in gewissen Fällen selbst veranlagen müssen. Neben diesen ausgewählten Herausforderungen ist ersichtlich, dass die neuen Rechtsvorschriften für PrivatanlegerInnen von Kryptowährungen auch positiv zu sehen sind. Durch das Ökosoziale Steuerreformgesetz 2022 gibt es erstmalig spezifische Regelungen zur Besteuerung von Kryptowährungen, wodurch die Rechtssicherheit in diesem Bereich erhöht wurde. Bei genauerer Analyse sind Detailaspekte dieser neuen Rechtsvorschrift kritisch zu sehen, im Großen und Ganzen handelt es sich jedoch um eine gelungene und durchdachte Gesetzesänderung.
(500279) George Hitchin
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Earthquake source parameters at the Sumatran Fault Zone: Identification of the activated fault plane
Creators: name: Lees, J.
name: Santosa, B.
name: Kasmolan, M.
name: Utama, W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Fifteen earthquakes (Mw 4.1-6.4) occurring at ten major segments of the Sumatran Fault Zone (SFZ) were analyzed to identify their respective fault planes. The events were relocated in order to assess hypocenter uncertainty. Earthquake source parameters were determined from three-component local waveforms recorded by IRIS-DMC and GEOFON broadband IA networks. Epicentral distances of all stations were less than 10°. Moment tensor solutions of the events were calculated, along with simultaneous determination of centroid position. Joint analysis of hypocenter position, centroid position, and nodal planes produced clear outlines of the Sumatran fault planes. The preferable seismotectonic interpretation is that the events activated the SFZ at a depth of approximately 14-210 km, corresponding to the interplate Sumatran fault boundary. The identification of this seismic fault zone is significant to the investigation of seismic hazards in the region.
MPEC 2023-U11 : 2023 TT15
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 TT15

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Sound produced by the rapidly inflating Santiaguito lava dome, Guatemala
Creators: name: Lees, J.M.
name: Johnson, J.B.
Publisher: name: Blackwell Publishing Ltd
Year: 2010

description: Vertical inflation of the Caliente lava dome at Santiaguito (Guatemala) occurs coincidentally with the onset of explosive eruptions and produces infrasound that is generally peaked between 0.5 and 2 Hz with amplitude of up to 5 Pa (at ∼1 km from vent). Inflation of up to ∼1 m progresses rapidly (within ∼2 s) and can encompass the entire surface of the ∼200-m-diameter dome. We use particle image velocimetry to quantify the time history of dome uplift and demonstrate that deflection of a volcano's solid surface can generate infrasound waves with amplitudes of a few Pa. The volumetric displacement history is used to model linear volumetric acoustic sources, both compact and of finite extent. Synthetic waveforms match recorded infrasound in terms of timing and frequency content. Amplitude fit is very good for a station located 3.3 km from the vent and less good for stations shielded by near vent topography.
Observation of anomalous Hanle spin precession lineshapes resulting from interaction with localized states
Creators: name: Berg, J. J. van den
name: van Wees, B. J.
name: Strupinski, W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It has been shown recently that in spin precession experiments, the interaction of spins with localized states can change the response to a magnetic field, leading to a modified, effective spin relaxation time and precession frequency. Here, we show that also the shape of the Hanle curve can change, so that it cannot be fitted with the solutions of the conventional Bloch equation. We present experimental data that shows such an effect arising at low temperatures in epitaxial graphene on silicon carbide with localized states in the carbon buffer layer. We compare the strength of the effect between materials with different growth methods, epitaxial growth by sublimation and by chemical vapor deposition. The presented analysis gives information about the density of localized states and their coupling to the graphene states, which is inaccessible by charge transport measurements and can be applied to any spin transport channel that is coupled to localized states.
description: 6 pages, 6 figures
title: Οργανωμένη παραθεριστική κατοικία στη μεταπολεμική Ελλάδα | τρεις μελέτες περίπτωσης

title: Postwar Greek organized country house Three case studies
Creators: name: Σαρρη Ευτυχια
Publisher: name: Technical University of Crete
Year: 2023

description: Σκοπός της εργασίας είναι η διερεύνηση των οργανωμένων παραθεριστικών οικισμών ως ιδιάζουσα παραγωγή κατοικίας στη μεταπολεμική Ελλάδα. Αντικείμενο της εργασίας αποτελεί η μελέτη τριών οργανωμένων παραθεριστικών οικισμών: Ο οικισμός στο Λιγονέρι Σπετσών, ο Οικοδομικός Συνεταιρισμός Ανωτέρου Διδακτικού Προσωπικού του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης στη Βουρβουρού της Σιθωνίας Χαλκιδικής και ο παραθεριστικός οικισμός «Απολλώνιο» στο Πόρτο Ράφτη. Η διερεύνηση των παραπάνω οικισμών προέκυψε από το γεγονός ότι χτίστηκαν στα μέσα της δεκαετίας του 1960, περίπου, και απευθύνονται σε τρεις διαφορετικές κατηγορίες οικιστών ως προς τα κοινωνικά τους χαρακτηριστικά και την οικονομική τους επιφάνεια. Μέσα από τη μελέτη των τριών υλοποιημένων παραδειγμάτων η ερευνητική εργασία επιχειρεί να απαντήσει σε ερωτήματα που αφορούν τη δομή των οικισμών, τη σχέση με την παράδοση στο πεδίο της δομής των οικισμών και της αρχιτεκτονικής των κατοικιών τους και στα χωρικά αποτυπώματα των κοινωνικών διαφοροποιήσεων στους υπό μελέτη οικισμούς.
(500240) James Forder
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Exotica or the failure of the strong cosmic censorship in four dimensions
Creators: name: Etesi, Gabor
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: Primary: 83C75, Secondary: 57N13, 53C28

description: In this letter a generic counterexample to the strong cosmic censor conjecture is exhibited. More precisely---taking into account that the conjecture lacks any precise formulation yet---first we make sense of what one would mean by a "generic counterexample" by introducing the mathematically unambigous and logically stronger concept of a "robust counterexample". Then making use of Penrose' nonlinear graviton construction (i.e., twistor theory) and a Wick rotation trick we construct a smooth Ricci-flat but not flat Lorentzian metric on the largest member of the Gompf--Taubes uncountable radial family of large exotic ${\mathbb R}^4$'s. We observe that this solution of the Lorentzian vacuum Einstein's equations with vanishing cosmological constant provides us with a sort of counterexample which is weaker than a "robust counterexample" but still reasonable to consider as a "generic counterexample". It is interesting that this kind of counterexample exists only in four dimensions.
description: LaTeX, 11 pages, 1 figure, the final published version
Single-grain dose-distribution measurements by optically stimulated luminescence using an integrated EMCCD-based system
Creators: name: Greilich, Steffen
name: Gribenski, Natacha
name: Mittelstraß, Dirk
name: Dornich, Kay
name: Huot, Sébastian
name: Preusser, Frank
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We report on the feasibility of assessing single-grain dose-distributions by using an EMCCD-based imaging system with complementary analysis software. Automated image-processing was successfully applied to compensate sample motion and for automated grain identification. Following a dose recovery test, 74 % of the grains were recognized successfully, and 44 % exhibited a suitable OSL dose response behavior to interpolate an equivalent dose value and a central dose recovery ratio of 1.038 was obtained.
description: 30 pages, 6 figures, 2 tables
Dissection of a composite volcanic earthquake at Santiaguito, Guatemala
Creators: name: Sanderson, R.
name: Escobar-Wolf, R.
name: Lees, J.M.
name: Johnson, J.B.
name: Lyons, J.
name: Waite, G.
Publisher: name: American Geophysical Union
Year: 2009

description: Volcano earthquake sources associated with eruptions at Santiaguito volcano in Guatemala are complex. Rock fracture, fluid now, and gas expansion occur at variable time scales and induce superposed ground motions, including both static and dynamic deformation, and atmospheric pressure disturbances. Dissection of this composite event is facilitated through extra-seismic observations, such as infrasound, geodetic, and visual monitoring. Multi-parametric investigation of an eruptive event on Jan. 4th 2009 reveals increased degassing, apparent as both geodetic tilt and harmonic seismoinfrasonic tremor, preceding an explosive event. The explosive event itself entails surface dome uplift, multiple eruptive pulses, and subsequent re-equilibration of the volcanic edifice manifested in derived tilt. We report here on an integrated approach to discerning the physical processes at the actively effusing and exploding Santiaguito volcano and describe the composite earthquake that ' occurs here.
Numerical simulations for the DRESDYN precession dynamo
Creators: name: Giesecke, A.
name: Albrecht, T.
name: Gerbeth, G.
name: Gundrum, T.
name: Stefani, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The next generation dynamo experiment currently under development at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) will consist of a precessing cylindrical container filled with liquid sodium. We perform numerical simulations of kinematic dynamo action applying a velocity field that is obtained from hydrodynamic models of a precession driven flow. So far, the resulting magnetic field growth-rates remain below the dynamo threshold for magnetic Reynolds numbers up to Rm=2000.
description: 9 pages, 9 figures, accepted for Magnetohydrodynamics (PAMIR 2014 special issue)
Volcanic eruptions, lightning, and a waterfall: Differentiating the menagerie of infrasound in the Ecuadorian jungle
Creators: name: Lees, J.M.
name: Yepes, H.
name: Johnson, J.B.
Publisher: name: American Geophysical Union
Year: 2006

description: In northeastern Ecuador, near Reventador Volcano, the airwaves are filled with infrasound. Here we identify the locations and characterize three distinct sources of local infrasound, including two types of infrasonic sources, which are not commonly discussed in the literature. The first of these novel sources is an intense and continuous radiator with a fixed location corresponding to San Rafael Waterfall. The signal from the river exhibits a tremor-like envelope that is well correlated across the 3-element infrasound network. Beyond the river, we also observe and map spatially variable sources corresponding to thunder. These transient signals have impulsive onsets, but are not well correlated across the network and are attributable to spatially-distributed source regions. Finally, we identify plentiful infrasound corresponding to Reventador's volcanic vent that is associated with unrest. This study demonstrates the utility of dispersed infrasound networks for distinguishing variable sources and improving interpretation of mechanisms of infrasound radiators.
Poor scaling between elastic energy release and eruption intensity at Tungurahua Volcano, Ecuador
Creators: name: Ruiz, M.C.
name: Ramon, P.
name: Lees, J.M.
name: Johnson, J.B.
Publisher: name: American Geophysical Union
Year: 2005

description: An important objective in volcanology is the quantification of eruption intensity through the study of elastic energy propagated into the atmosphere and ground. To better understand the relation between elastic wave radiation and eruptive activity we deployed seismic, acoustic, and video instrumentation at the active Tungurahua Volcano (Ecuador) in Nov.-Dec. of 2004. Our data show that plume expansion scales very poorly with both seismic and acoustic trace energy and only the initial amplitude of the acoustic signal is perhaps correlated with initial plume rise speeds. In general, the eventual size of Tungurahua eruption plumes does not appear to be controlled by elevated material accelerations within the conduit, which are primary influences on elastic energy radiation. This result has vital implications for volcano observatories, which are interested in using seismic and acoustic trace amplitudes as proxies for eruption magnitudes.
Vibrationally Excited C$_4$H
Creators: name: Cooksy, Andrew L.
name: Gottlieb, C. A.
name: Killian, T. C.
name: Thaddeus, P.
name: Patel, Nimesh A.
name: Young, Ken H.
name: McCarthy, M. C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Rotational spectra in four new excited vibrational levels of the linear carbon chain radical C$_4$H radical were observed in the millimeter band between 69 and 364 GHz in a low pressure glow discharge, and two of these were observed in a supersonic molecular beam between 19 and 38 GHz. All have rotational constants within 0.4% of the $^2Σ^+$ ground vibrational state of C$_4$H and were assigned to new bending vibrational levels, two each with $^2Σ$ and $^2Π$ vibrational symmetry. The new levels are tentatively assigned to the $1ν_6$ and $1ν_5$ bending vibrational modes (both with $^2Π$ symmetry), and the $1ν_6 + 1ν_7$ and $1ν_5 + 1ν_6$ combination levels ($^2Σ$ symmetry) on the basis of the derived spectroscopic constants, relative intensities in our discharge source, and published laser spectroscopic and quantum calculations. Prior spectroscopic constants in the $1ν_7$ and $2ν_7$ levels were refined. Also presented are interferometric maps of the ground state and the $1ν_7$ level obtained with the SMA near 257 GHz which show that C$_4$H is present near the central star in IRC+10216. We found no evidence with the SMA for the new vibrationally excited levels of C$_4$H at a peak flux density averaged over a $3^{\prime\prime}$ synthesized beam of $\ge 0.15$ Jy/beam in the 294-296 and 304-306 GHz range, but it is anticipated that rotational lines in the new levels might be observed in IRC+10216 when ALMA attains its full design capability.
description: The Astrophysical Journal Supplement Series, in press. 25 pages with 7 figures
(500218) William Henry Godden
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Mantle flow at a slab edge: Seismic anisotropy in the Kamchatka region
Creators: name: Ozerov, A.
name: Peyton, V.
name: Gordeev, E.
name: Lees, J.
name: Park, J.
name: Levin, V.
name: Brandon, M.
Publisher: name: American Geophysical Union
Year: 2001

description: The junction of the Aleutian Island and the Kamchatka peninsula defines a sharp turn in the boundary of the Pacific and North American plates, terminating the subduction zones of the northwest Pacific. The regional pattern of shear-wave birefringence near the junction indicates that trench-parallel strain follows the seismogenic Benioff zone, but rotates to trench-normal beyond the slab edge. Asthenospheric mantle is inferred to flow around and beneath the disrupted slab edge, and may influence the shallowing dip of the Benioff zone at the Aleutian junction.
Are the B decay anomalies related to neutrino oscillations?
Creators: name: Boucenna, Sofiane M.
name: Valle, Jose W. F.
name: Vicente, Avelino
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Neutrino oscillations are solidly established, with a hint of CP violation just emerging. Similarly, there are hints of lepton universality violation in $b \to s$ transitions at the level of $2.6 σ$. By assuming that the unitary transformation between weak and mass charged leptons equals the leptonic mixing matrix measured in neutrino oscillation experiments, we predict several lepton flavor violating (LFV) B meson decays. We are led to the tantalizing possibility that some LFV branching ratios for B decays correlate with the leptonic CP phase $δ$ characterizing neutrino oscillations. Moreover, we also consider implications for $\ell_i \to \ell_j \ell_k \ell_k$ decays.
description: 5 pages, 2 figures; v2: 1 ref. added; v3: matches version published in PLB
A comparative conformational study of (C6H5O)2P(O)(NHC(S)NHCH2C6H5) and analogous X-ray structures: energy calculations (solid-state/gas phase)
Creators: name: Hosseinpoor, Saeed
name: Pourayoubi, Mehrdad
name: Dušek, Michal
name: Skořepová, Eliška
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Computational Biology

description: The crystal structure of diphenyl (benzylcarbamothioyl)phosphoramide, (C6H5O)2P(O)(NHC(S)NHCH2C6H5), is reported. In the P(O)NHC(S)NH moiety the conformations are −ap/+ap/−sp, based on the O = P-N-C/P-N-C-N/P-N-C = S torsion angles (ap = antiperiplanar and sp = synperiplanar), which are different from the conformations of similar moiety in analogous structures retrieved from the Cambridge Structural Database (CSD). The calculated energies of the most stable seven conformers of the title compound (gas phase) are compared with the conformer found in the crystal structure, and the latter shows a relatively high energy value. In the crystal structure, a double-layered two-dimensional supramolecular assembly, along the bc plane, is mediated through (N-H···)(N-H···)O = P and π···π interactions, with cooperation from C-H···π, C-H···O and C-H···S. Energy framework calculations show the significant role of N-H···O hydrogen bonds in the c direction and the weak interactions with mainly dispersion component in the other two directions. The hydrogen bonds and weak interactions were confirmed by the quantum theory of atoms in molecules (AIM).
Cartesian parametrization of anisotropic traveltime tomography
Creators: name: Wu, H.
name: Lees, J.M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1999

description: A new method for inverting P-wave traveltimes for seismic anisotropy on a local scale is presented and tested. In this analysis, direction-dependent seismic velocity is represented by a second- or fourth-order Cartesian tensor, which is shown to be equivalent to decomposing a velocity surface using a basis set of Cartesian products of unit vectors. The new inversion method for P- and S-wave anisotropy from traveltime data is based on the tensor decomposition. The formulation is formally derived from a Taylor series expansion of a continuously extended, 3-D velocity function originally defined on the surface of the unit sphere. This approach allows us to solve a linear inversion instead of the standard non-linear method. The resultant, linearized, fourth-order traveltime equation is similar to a previous fourth-order result (Chapman and Pratt 1992), although our representation offers a natural second-order simplification. Conventional isotropic traveltime tomography is a special case of our tensorial representation of velocities. P-wave velocity can be represented by a second-order tensor (matrix) as a first approximation, although S-wave traveltime tomography is intrinsically fourth order because of S-wave solution duality. Differences between isotropic and anisotropic parameterizations are investigated when velocity is represented by a matrix A. The trade-off between isotropy and anisotropy in practical tomography, which differs from the fundamental deficiency of anisotropic traveltime tomography (Mochizuki 1997), is shown to be ~ 1; that is, their effects are of the same order. We conclude that anisotropic considerations may be important in velocity inversions where ray coverage is less than optimal. On the other hand, when the ray directional coverage is complete and balanced, effects of anisotropy sum to zero and the isotropic part gives the result obtained from inverting for isotropic variations of velocity alone. Synthetic test data sets are inverted, demonstrating the effectiveness of the new inversion approach. When ray coverage is fairly complete, original anisotropy is well recovered, even with random noise introduced, although anisotropy ambiguities arise where ray coverage is limited. Random noise was found to be less important than ray directional coverage in anisotropic inversions.
P wave anisotropy, stress, and crack distribution at Coso geothermal field, California
Creators: name: Wu, H.
name: Lees, J.M.
Publisher: name: Blackwell Publishing Ltd
Year: 1999

description: A new inversion method for P wave anisotropy [Wu and Lees, 1999a] has been applied to high-precision, microseismic traveltime data collected at Coso geothermal region, California. Direction-dependent P wave velocity and thus its perturbation, are represented by a symmetric positive definite matrix A instead of a scalar. The resulting anisotropy distribution is used to estimate variations in crack density, stress distribution and permeability within the producing geothermal field. A circular dome-like structure is observed at the southwestern part of the geothermal region southwest of Sugarloaf Mountain. Using a linear stress-bulk modulus relationship, deviatoric stress is estimated to be 3 - 6 MPa at geothermal production depths (1-2 km), assuming all the anisotropy is related to stress. The stress field is compressional NNE-SSW and dilational WNW-ESE, coinciding with a previous, independent study using earthquake focal mechanisms. Following a theory on flat, elliptic cracks, residual crack density estimated from P anisotropy is ∼0.0078 assuming crack aspect ratios ≫ 1 : 60 and is ∼0.041 when crack aspect ratios are close to 1:60. Residual crack orientation distribution is related to velocity anisotropy. On the basis of anisotropic part of crack density distribution function, the anisotropic part of permeability distribution may be calculated by a statistical approach via simple parallel fluid flow along cracks.
MPEC 2023-U12 : 2023 TU15
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 TU15

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Three-dimensional P and S wave velocity structures of the Coso Geothermal Area, California, from microseismic travel time data
Creators: name: Lees, J.M.
name: Wu, H.
Publisher: name: Blackwell Publishing Ltd
Year: 1999

description: High precision P and S wave travel times for 2104 microearthquakes with focus <6 km are used in a non-linear inversion to derive high-resolution three-dimensional compressional and shear velocity structures at the Coso Geothermal Area in eastern California. Block size for the inversion is 0.2 km horizontally and 0.5 km vertically and inversions are investigated in the upper 5 km of the geothermal area. Spatial resolution, calculated by synthetic modeling of a cross model at critical locations, is estimated to be 0.35 km for Vp and 0.5 km for Vs. Model uncertainties are estimated by a jackknife approach and simulation of random and associated picking errors. Low-velocity zones for both P and S waves are identified at geothermal production depths (1-3 km). A large, low Vp (-6%) zone is found at depth 2-2.5 km 2 km southwest of Sugarloaf Mountain where high attenuation has been previously reported. However, a general high-Vp zone is seen under Coso Hot Springs with a slightly low Vs zone, which is characteristic of fluid saturation. The overall distributions of Vp and Vs perturbations do not correlate. An isolated high-Vs (+9%) feature, about 2 km in diameter, is unambiguously seen 2 km due west of Sugarloaf extending from surface to depth. This feature is surrounded by a circular, low-Fs belt of ∼1 km width. The surrounding belt is probably the cracked, high-porosity reservoir/conduit of geothermal fluid flow. In the 2 km southwest Sugarloaf region, we found low Vp and high Vs at geothermal production depths from 1 to 2.5 km. Combined with attenuation results, this may represent a hot, fluid-depleted center of magmatic activity.