cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The exact solution of generalized Dicke models via Susskind-Glogower operators
Creators: name: Rodríguez-Lara, B. M.
name: Moya-Cessa, H. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show a right unitary transformation approach based on Susskind-Glogower operators that diagonalizes a generalized Dicke Hamiltonian in the field basis and delivers a tridiagonal Hamiltonian in the Dicke basis. This tridiagonal Hamiltonian is diagonalized by a set of orthogonal polynomials satisfying a three-term recurrence relation. Our result is used to deliver a closed form, analytic time evolution for the case of a Jaynes-Cummings-Kerr model and to study the time evolution of the population inversion, reduced field entropy, and Husimi's Q-function of the field for ensembles of interacting two-level systems under a Dicke-Kerr model.
description: 12 pages, 3 figures
Das sächsischskarolingische Gräberfeld bei Drantum, Gern. Emstek, Kr. Cloppenburg
Creators: name: Zoller, Dieter
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Die Markierungssteine der frühgeschichtlichen Gräber auf dem Karkbarg von Unterstedt, Kr. Rotenburg (Hann.)
Creators: name: Grenz, Rudolf
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Radioactivity and fragmentation of UHECR: Correlating gamma anisotropy and neutrino PeV events
Creators: name: Fargion, Daniele
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: UHECR (Ultra High Energy Cosmic Rays) were expected to be protons, to fly straight and to suffer from a GZK (opacity on CMB radiation) cut off. AUGER suggested in 2007 that such early UHECR anisotropy was compatible with the foreseen Super-Galactic plane, while both HIRES and AUGER confirmed this apparent GZK cut-off in the spectra. However, the same AUGER composition since 2007 had favored nuclei (and not nucleons). The recent absence of narrow angle clustering in UHECR maps, as it should be expected for protons, the missing of events along the nearest Cluster Virgo, the wide spread (nearly 16 degree angle) of UHECR along Cen A are in disagreement with the first proton-UHECR AUGER understanding. Since 2008 we had claimed a light nuclei role for the Cen A crowded area. However the ICECUBE absence of TeV neutrino clustering or anisotropy, its spectra steepening favors mostly a ruling atmospheric neutrino noise up to tens TeV. However two recent PeV neutrino event, cannot easily coexist or been extrapolated with such an atmospheric ruling scenario, or with GZK (either nucleons or nuclei) secondary expected spectra. Finally tens of TeV gamma anisotropy in ARGO-MILAGRO-ICECUBE maps may hardly be associated with known hadronic sources. We imagine such anisotropy ruled by diffused gamma secondaries, shining along UHECR bending and flight: radioactive (Ni,Co,Al,D, neutron) light and heavy UHECR nuclei in GRB-SGRs-jet, while scattering or decaying in flight, may paint in the sky (by gamma, electrons and neutrinos secondaries) their trajectories and bending, connecting UHECR spread events with TeV anisotropy, and also offering a very realistic source of first, otherwise puzzling, observed PeV neutrinos. Evidences for such relativistic Ni jet in 4U1630-47 system has been observed recently by Díaz Trigo collaboration.
description: 6 pages, 5 figures: corrections following referee comments and suggestions. arXiv admin note: text overlap with arXiv:1207.0254, arXiv:1201.0157
Ein Faustkeil von Scheeßel, Kr. Rotenburg/Wümme
Creators: name: Dehnke, Rudolf
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Vorgeschichtliche Siedlungsspuren in Rosdorf, Kr. Göttingen
Creators: name: Maier, Reinhard
name: Peters, Hans-Günter
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Free resolutions of orbit closures for the representations associated to gradings on Lie algebras of type $E_6$, $F_4$ and $G_2$
Creators: name: Galetto, Federico
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 22E55, 13D02, 14M17

description: The irreducible representations of complex semisimple algebraic groups with finitely many orbits are parametrized by graded simple Lie algebras. For the exceptional Lie algebras, Kraskiewicz and Weyman exhibit the Hilbert polynomials and the expected minimal free resolutions of the normalization of the orbit closures. We present an interactive method to construct explicitly these and related resolutions in Macaulay2. The method is then used in the cases of the Lie algebras of type $E_6$, $F_4$ and $G_2$, to confirm the shape of the expected resolutions as well as some geometric properties of the orbit closures.
description: v2: fixed section 5.1 v3: added some references, updated links
Untersuchungen an vor- und frühgeschichtlichen Wallanlagen im südlichen Niedersachsen
Creators: name: Peters, Hans-Günter
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Acceleration of particles by black hole with gravitomagnetic charge immersed in magnetic field
Creators: name: Abdujabbarov, Ahmadjon
name: Tursunov, Arman
name: Ahmedov, Bobomurat
name: Kuvatov, Abdulla
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The collision of test charged particles in the vicinity of an event horizon of a weakly magnetized non-rotating black hole with gravitomagnetic charge has been studied. The presence of the external magnetic field decreases the innermost stable circular orbits (ISCO) radii of charged particles. The opposite mechanism occurs when there is nonvanishing gravitomagnetic charge. For a collision of charged particle moving at ISCO and the neutral particle falling from infinity the maximal collision energy can be decreased by gravitomagnetic charge in the presence of external asymptotically uniform magnetic field.
description: 8 pages,7 figures, 1 table, Accepted for publication in Astrophysics & Space Science
Ausgrabungen im Gelände der Pfalz Pöhlde, Kr. Osterode/Harz
Creators: name: Claus, Martin
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Probleme der Küstenforschung im südlichen Nordseegebiet, hrsg. v. W. Haarnagel
Creators: name: Bantelmann, Albert
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Probleme der Küstenforschung im südlichen Nordseegebiet, hrsg. v. W. Haarnagel, Band 8, Hildesheim 1965
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
Ziegert, Helmut: Zur Chronologie und Gruppengliederung der westlichen Hügelgräberkultur
Creators: name: Jacob-Friesen, Gerhard
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Ziegert, Helmut: Zur Chronologie und Gruppengliederung der westlichen Hügelgräberkultur. (Berliner Beiträge zur Vor- und Frühgeschichte, Bd. 7.) Berlin 1963. 4°, 58 S. 18 Taf. u. 7 Karten
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 34 (1965): Nachrichten aus Niedersachsens Urgeschichte
MatrixSwitch overview from Modular implementation of the linear and cubic-scaling orbital minimization methods in electronic structure codes using atomic orbitals
Creators: name: Lebedeva, Irina V.
name: García, Alberto
name: Artacho, Emilio
name: Ordejón, Pablo
Publisher: name: The Royal Society
Year: 2023
Subjects: Computational Physics

description: Overview of methods of MatrixSwitch library including recent updates
MSSM Electroweak Baryogenesis and LHC Data
Creators: name: Carena, Marcela
name: Nardini, Germano
name: Quiros, Mariano
name: Wagner, Carlos E. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Electroweak baryogenesis is an attractive scenario for the generation of the baryon asymmetry of the universe as its realization depends on the presence at the weak scale of new particles which may be searched for at high energy colliders. In the MSSM it may only be realized in the presence of light stops, and with moderate or small mixing between the left- and right-handed components. Consistency with the observed Higgs mass around 125 GeV demands the heavier stop mass to be much larger than the weak scale. Moreover the lighter stop leads to an increase of the gluon-gluon fusion Higgs production cross section which seems to be in contradiction with indications from current LHC data. We show that this tension may be considerably relaxed in the presence of a light neutralino with a mass lower than about 60 GeV, satisfying all present experimental constraints. In such a case the Higgs may have a significant invisible decay width and the stop decays through a three or four body decay channel, including a bottom quark and the lightest neutralino in the final state. All these properties make this scenario testable at a high luminosity LHC.
description: 28 pages, 18 figures; v2) Discussion on point C removed for conciseness, minor changes in the text to match the published version
Henriette Brink-Kloke, Hayo Heinrich u. Ute Bartelt, Das Schlüsselloch-Gräberfeld am Oespeler Bach. Befunde und Funde der jüngeren Bronzezeit am Hellweg in Oespel und Marten, Stadt Dortmund
Creators: name: Wilbertz, Otto Mathias
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Henriette Brink-Kloke, Hayo Heinrich u. Ute Bartelt, Das Schlüsselloch-Gräberfeld am Oespeler Bach. Befunde und Funde der jüngeren Bronzezeit am Hellweg in Oespel und Marten, Stadt Dortmund. Mit Beiträgen von Manfred Kunter und Ursula Tegtmeier. Bodenaltertümer Westfalens. Berichte des Westfälischen Museums für Archäologie, Landesmuseum und Amt für Bodendenkmalpflege, Band 43. Mainz am Rhein: Verlag Philipp von Zabern 2006. 154 Seiten mit Abbildungen; 131 Tafeln und 1 Beilage. Gebunden. ISBN 978-3-8053- 3719-9
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 77 (2008): Nachrichten aus Niedersachsens Urgeschichte
Manifold arrangements
Creators: name: Ehrenborg, Richard
name: Readdy, Margaret
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 06A07 (Primary) 52B05, 57N80 (Secondary)

description: We determine the cd-index of the induced subdivision arising from a manifold arrangement. This generalizes earlier results in several directions: (i) One can work with manifolds other than the n-sphere and n-torus, (ii) the induced subdivision is a Whitney stratification, and (iii) the submanifolds in the arrangement are no longer required to be codimension one.
description: 24 pages, 3 figures. Changes include added references, typos corrected and arguments polished
AIMS Authorship Memo Template
Creators: name: Burgin, Amy J.
name: Allen, Daniel
name: Atkinson, Carla L.
name: Godsey, Sarah E.
name: Kuehn, Kevin
name: Aho, Ken
name: Benstead, Jonathan P.
name: Brooks-Kieffer, Jamene
name: Johnson, Jay
name: Jones, C. Nathan
name: Lohse, Kathleen A.
name: Meisel, Josh
name: Seybold, Erin C.
name: You, Yaqi
name: Zeglin, Lydia
name: Zipper, Samuel C.
name: Speir, Shannon L.
Publisher: name: figshare
Year: 2023
Subjects: Environmental education curriculum and pedagogy
Science, technology and engineering curriculum and pedagogy

description: This is the AIMS project-wide Authorship Memo template that corresponds to the project Authorship Policy developed by lead PI Burgin, Co-PIs, and Co-Is in order to clearly communicate expectations for mentors and mentees within the project. This document is being posted in conjunction with a manuscript by Peterson and co-authors in Ecology and Evolution Academic Practice as a resource to other big projects.
O VÍRUS QUE MAIS MATA
Creators: name: Santana, José Cláudio Pavão
Publisher: name: Zenodo - Cadernos da Pena do Pavao
Year: 2023

description: Ano 08 – n. 12/2020
O Brasil precisava de estádios porque não se faz Copa do Mundo com hospitais. E agora? Bom, agora improvisam-se hospitais de campanha, porque não há nem campeonato estadual.
Large-Scale Distributed Internet-based Discovery Mechanism for Dynamic Spectrum Allocation
Creators: name: Skjegstad, Magnus
name: Ellingsæter, Brage
name: Maseng, Torleiv
name: Crowcroft, Jon
name: Kure, Øivind
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Scarcity of frequencies and the demand for more bandwidth is likely to increase the need for devices that utilize the available frequencies more efficiently. Radios must be able to dynamically find other users of the frequency bands and adapt so that they are not interfered, even if they use different radio protocols. As transmitters far away may cause as much interference as a transmitter located nearby, this mechanism can not be based on location alone. Central databases can be used for this purpose, but require expensive infrastructure and planning to scale. In this paper, we propose a decentralized protocol and architecture for discovering radio devices over the Internet. The protocol has low resource requirements, making it suitable for implementation on limited platforms. We evaluate the protocol through simulation in network topologies with up to 2.3 million nodes, including topologies generated from population patterns in Norway. The protocol has also been implemented as proof-of-concept in real Wi-Fi routers.
description: Accepted for publication at IEEE DySPAN 2014
Peter Schmid, Die Keramikfunde der Grabung Feddersen Wierde (1. Jh. v. bis 5. Jh. n. Chr.)
Creators: name: Busch-Hellwig, Sandra
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Peter Schmid, Die Keramikfunde der Grabung Feddersen Wierde (1. Jh. v. bis 5. Jh. n. Chr.). Feddersen Wierde 5. Probleme der Küstenforschung im südlichen Nordseegebiet 29. Oldenburg: Isensee Verlag 2006. 192 Seiten mit 5 schwarz-weißen Abbildungen, 92 Tafeln und 2 Tabellen. Leinen. ISBN 978-3-89995-355-8
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 77 (2008): Nachrichten aus Niedersachsens Urgeschichte
Archäologische Kommission für Niedersachsen e.V.
Creators: name: Bärenfänger, Rolf
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 77 (2008): Nachrichten aus Niedersachsens Urgeschichte
A sudden collapse in the transport lifetime across the topological phase transition in $(Bi_{1-x}In_x)_2 Se_3$
Creators: name: Wu, Liang
name: Brahlek, M.
name: Aguilar, R. Valdés
name: Stier, A. V.
name: Morris, C. M.
name: Lubashevsky, Y.
name: Bilbro, L. S.
name: Bansal, N.
name: Oh, S.
name: Armitage, N. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Topological insulators (TIs) are newly discovered states of matter with robust metallic surface states protected by the topological properties of the bulk wavefunctions. A quantum phase transition (QPT) from a TI to a conventional insulator and a change in topological class can only occur when the bulk band gap closes. In this work, we have utilized time-domain terahertz spectroscopy (TDTS) to investigate the low frequency conductance in (Bi$_{1-x}$In$_x$)$_2$Se$_3$ as we tune through this transition by indium substitution. Above certain substitution levels we observe a collapse in the transport lifetime that indicates the destruction of the topological phase. We associate this effect with the threshold where states from opposite surfaces hybridize. The substitution level of the threshold is thickness dependent and only asymptotically approaches the bulk limit $x \approx 0.06$ where a maximum in the mid-infrared absorption is exhibited. This absorption can be identified with the bulk band gap closing and a change in topological class. The correlation length associated with the QPT appears as the evanescent length of the surface states. The observation of the thickness-dependent collapse of the transport lifetime shows the unusual role that finite size effects play in this topological QPT.
description: Accepted version for publication in Nature Physics
Examining the Resourcefulness of War Time Recipes to Develop Future Urban Food Systems for Singapore
Creators: name: Teo, Shan Chian
name: Koh, Jeffrey Tzu Kwan Valino
name: Nathan, Russell
Publisher: name: Singapore Institute of Technology
Year: 2024
Subjects: classificationCode: 330314
subject: Sustainable design
classificationCode: 300606
subject: Food sustainability

description: Singapore is an anomaly in that despite producing only 10% of its food to meet local needs, it was ranked the fourth most food-secure country in the world, according to the 2017 edition of the Global Food Security Index. This is achieved through a heavy dependence on the global food supply and through the diversification of sources. Yet, considering the recent coronavirus pandemic, the ongoing conflict between Russia and Ukraine, and the growing threats from the impacts of climate change, how does Singapore adapt to enhance its food security? Understanding wartime diets through recipes and food stories can be an important method for addressing food system challenges exacerbated by climate change. Wartime periods, marked by resource scarcity and rationing, offer valuable insights into resilient food systems and adaptive dietary practices. By examining historical approaches to food production and consumption during times of conflict, and the endemic edible vegetation of Singapore, we can glean strategies to mitigate the impact of climate-induced disruptions on food production and distribution. During conflicts, nations implemented rationing programs, promoting moderation and reducing waste. Such measures compelled populations to adopt diverse, nutrient-dense diets and minimize reliance on resourceintensive foods. These practices are increasingly relevant today as climate change threatens agricultural productivity and strains natural resources, necessitating sustainable food consumption patterns. This is especially so for Singapore, which is highly dependent on other countries to meet its dietary needs. Wartime experiences highlight the importance of local food production and community resilience. In response to disrupted supply chains, communities turned to home gardens, collective farming initiatives, and localized food networks to supplement rations. These decentralized food systems promoted self-sufficiency and reduced dependence on vulnerable global markets, offering a model for building climate-resilient food systems resilient to supply chain disruptions caused by extreme weather events. How might we reference past scenarios, mapped to current context to help us develop strategies and systems to address future needs? In conclusion, insights from wartime diets offer valuable lessons for addressing contemporary food system challenges arising from climate change. By promoting resourcefulness, decentralization, and equity in food production and distribution, Singapore can enhance resilience and adaptability in the face of environmental uncertainty.
Magnetic diffusion driven shear instability of solar flux tubes
Creators: name: Pandey, B. P.
name: Wardle, Mark
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Macroscopic gas motions are widespread throughout the solar atmosphere and shearing motions couple to the non--ideal effects, destabilising low frequency fluctuations in the medium. The origin of this non-ideal magnetohydrodynamic instability lies in the collisional coupling of the neutral particles to the magnetized plasma in the presence of a sheared background flow. Unsurprisingly, the maximum growth rate and most unstable wavenumber depend on the flow gradient and ambient diffusivities. The orientation of the magnetic field, velocity shears and perturbation wave vector play a crucial role in assisting the instability. When the magnetic field and wave vector are both vertical, ambipolar and Ohm diffusion can be combined as Pedersen diffusion and cause only damping; in this case only Hall drift in tandem with shear flow drives the instability. However, for non-vertical fields and oblique wave vectors, both ambipolar diffusion and Hall drift are destabilizing. We investigate the stability of magnetic elements in the network and internetwork regions. The shear scale is not yet observationally determined, but assuming a typical shear flow gradient $\sim 0.1 \,\mbox{s}^{-1}$ we show that the magnetic diffusion shear instability grows on a time scale of one minute. Thus, it is plausible that network--internetwork magnetic elements are subject to this fast growing, diffusive shear instability, which could play an important role in driving low frequency turbulence in the plasma in the solar photosphere and chromosphere.
description: MNRAS (in press), 13 pages, 4 figures, 2 tables
T/B scaling of magnetization in the mixed valent compound β-YbAlB4
Creators: name: Matsumoto, Yosuke
name: Nakatsuji, S.
name: Kuga, K.
name: Karaki, Y.
name: Shimura, Y.
name: Sakakibara, T.
name: Nevidomskyy, A. H.
name: Coleman, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Here we provide the first clear evidence of Fermi-liquid breakdown in an intermediate valence system. We employ high precision magnetization measurements of the valence fluctuating superconductor beta-YbAlB4 to probe the quantum critical free energy down to temperatures far below the characteristic energy scale of the valence fluctuations. The observed T/B scaling in the magnetization over three decades not only indicates unconventional quantum criticality, but places an upper bound on the critical magnetic field |B_c| < 0.2 mT, a value comparable with the Earth's magnetic field and six orders of magnitude smaller than the valence fluctuation scale. This tiny value of the upper bound on B_c, well inside the superconducting dome, raises the fascinating possibility that valence fluctuating beta-YbAlB4 is intrinsically quantum critical, without tuning the magnetic field, pressure, or composition: the first known example of such a phenomenon in a metal.
description: 4 pages, 2 figures, proceedings for SCES 2011
title: Le Programme d'Appui aux Stratégies Sociales (PASS), une poignée de mains entre mutualistes du Nord et du Sud (Europe-Afrique)
Creators: name: Ayité, J.-V.
Publisher: name: MTSI - Revue
Year: 2021

description: Le Programme d’Appui aux Stratégies Sociales, (PASS), est un pôle d’expertise en santé et protection sociale à but non lucratif qui prolonge les activités du Programme d’appui aux stratégies mutualistes de santé, géré par Expertise France de 2015 à 2020. La structure est opérationnelle depuis août 2019 grâce au soutien de deux groupements mutualistes français, le Groupe Vyv et la Fédération Nationale de la Mutualité Française (FNMF), sous la forme d’une société par actions simplifiées à but non lucratif. Partant de son socle originel d’appui au développement des couvertures santé mutualistes, le PASS élargit son domaine d’intervention aux projets, politiques et systèmes de santé et de protection sociale avec une attention particulière sur les problématiques liées aux femmes et aux enfants. Le PASS propose ainsi une expertise construite autour de 3 domaines d’activité stratégiques qui sont : (1) l’appui aux mécanismes solidaires de financement de la santé de type mutualiste (audit, études, conseil, formation) ; (2) l’appui au renforcement des services de santé bâtis en lien avec les politiques publiques et (3) l’apport en expertise et en capacités opérationnelles en réponse à diverses problématiques ponctuelles de santé et de protection sociale. Basé à Abidjan en Côte d’Ivoire, le PASS étend l’ensemble de ses activités aux autres pays d’Afrique francophone.
description: Médecine Tropicale et Santé Internationale - magazine, No 1 (2021): MTSI-Magazine
Francesco Buranelli, L’urna Calabresi di Cerveteri
Creators: name: Steingräber, Stephan
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Francesco Buranelli, L’urna Calabresi di Cerveteri. Monumenti, Musei e Gallerie Pontificie 41. L’Erma di Bretschneider, Rom 1985. 79 Seiten, 42 Abbildungen.
description: Bonner Jahrbücher, Bd. 188.1988: Bonner Jahrbücher
The Study of Goldstone Modes in $ν$=2 Bilayer Quantum Hall Systems
Creators: name: Hama, Y.
name: Hidaka, Y.
name: Tsitsishvili, G.
name: Ezawa, Z. F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: At the filling factor $ν$=2, the bilayer quantum Hall system has three phases, the spin-ferromagnet phase, the spin singlet phase and the canted antiferromagnet (CAF) phase, depending on the relative strength between the Zeeman energy and interlayer tunneling energy. We present a systematic method to derive the effective Hamiltonian for the Goldstone modes in these three phases. We then investigate the dispersion relations and the coherence lengths of the Goldstone modes. To explore a possible emergence of the interlayer phase coherence, we analyze the dispersion relations in the zero tunneling energy limit. We find one gapless mode with the linear dispersion relation in the CAF phase.
description: 13 pages, no figures. One reference is added. Typos corrected
The Nelson-Seiberg theorem revised
Creators: name: Kang, Zhaofeng
name: Li, Tianjun
name: Sun, Zheng
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The well-accepted Nelson-Seiberg theorem relates R-symmetries to supersymmetry (SUSY) breaking vacua, and provides a guideline for SUSY model building which is the most promising physics beyond the Standard Model. In the case of Wess-Zumino models with perturbative superpotentials, we revise the theorem to a combined necessary and sufficient condition for SUSY breaking which can be easily checked before solving the vacuum. The revised theorem provides a powerful tool to construct either SUSY breaking or SUSY vacua, and offers many practicable applications in low energy SUSY model building and string phenomenology.
description: 5 pages; v2: abstract and introduction revised; v3: condition of perturbative superpotentials added, JHEP published version
Path properties of the disordered pinning model in the delocalized regime
Creators: name: Alexander, Kenneth S.
name: Zygouras, Nikos
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We study the path properties of a random polymer attracted to a defect line by a potential with disorder, and we prove that in the delocalized regime, at any temperature, the number of contacts with the defect line remains in a certain sense "tight in probability" as the polymer length varies. On the other hand we show that at sufficiently low temperature, there exists a.s. a subsequence where the number of contacts grows like the log of the length of the polymer.
description: Published in at http://dx.doi.org/10.1214/13-AAP930 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The Construction of Spin Foam Vertex Amplitudes
Creators: name: Bianchi, Eugenio
name: Hellmann, Frank
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Spin foam vertex amplitudes are the key ingredient of spin foam models for quantum gravity. These fall into the realm of discretized path integral, and can be seen as generalized lattice gauge theories. They can be seen as an attempt at a 4-dimensional generalization of the Ponzano-Regge model for 3d quantum gravity. We motivate and review the construction of the vertex amplitudes of recent spin foam models, giving two different and complementary perspectives of this construction. The first proceeds by extracting geometric configurations from a topological theory of the BF type, and can be seen to be in the tradition of the work of Barrett, Crane, Freidel and Krasnov. The second keeps closer contact to the structure of Loop Quantum Gravity and tries to identify an appropriate set of constraints to define a Lorentz-invariant interaction of its quanta of space. This approach is in the tradition of the work of Smolin, Markopoulous, Engle, Pereira, Rovelli and Livine.
Three-Dimensional Moving-Mesh Simulations of Galactic Center Cloud G2
Creators: name: Anninos, Peter
name: Fragile, P. Chris
name: Wilson, Julia
name: Murray, Stephen D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using three-dimensional, moving-mesh simulations, we investigate the future evolution of the recently discovered gas cloud G2 traveling through the galactic center. We consider the case of a spherical cloud initially in pressure equilibrium with the background. Our suite of simulations explores the following parameters: the equation of state, radial profiles of the background gas, and start times for the evolution. Our primary focus is on how the fate of this cloud will affect the future activity of Sgr A*. From our simulations we expect an average feeding rate in the range of $5-19 \times 10^{-8}$ solar masses per year beginning in 2013 and lasting for at least 7 years (our simulations stop in year 2020). The accretion varies by less than a factor of three on timescales <1 month, and shows no more than a factor of 10 difference between the maximum and minimum. These rates are comparable to the current estimated accretion rate in the immediate vicinity of Sgr A*, although they represent only a small (<5%) increase over the current expected feeding rate at the effective inner boundary of our simulations. Therefore, the break up of cloud G2 may have only a minimal effect on the brightness and variability of Sgr A* over the next decade. This is because current models of the galactic center predict that most of the gas will be caught up in outflows. However, if the accreted G2 material can remain cold, it may not mix well with the hot, diffuse background gas, and instead accrete efficiently onto Sgr A*. Further observations of G2 will give us an unprecedented opportunity to test this idea. The break up of the cloud itself may also be observable. By tracking the amount of cloud energy that is dissipated during our simulations, we are able to get a rough estimate of the luminosity associated with its tidal disruption; we find values of a few $10^{36}$ erg/s.
description: 14 pages, 8 figures, final accepted version
Twisted homology for the mirabolic nilradical
Creators: name: Aizenbud, Avraham
name: Gourevitch, Dmitry
name: Sahi, Siddhartha
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20G20, 22E30, 22E45

description: The notion of derivatives for smooth representations of $GL(n,\mathbb{Q}_p)$ was defined in [BZ77]. In the archimedean case, an analog of the highest derivative was defined for irreducible unitary representations in [Sah89] and called the "adduced" representation. In [AGS] derivatives of all orders were defined for smooth admissible Frechet representations (of moderate growth). A key ingredient of this definition is the functor of twisted coinvariants with respect to the nilradical of the mirabolic subgroup. In this paper we prove exactness of this functor and compute it on a certain class of representations. This implies exactness of the highest derivative functor, and allows to compute highest derivatives of all monomial representations. In [AGS] these results are applied to finish the computation of adduced representations for all irreducible unitary representations and to prove uniqueness of degenerate Whittaker models for unitary representations.
description: 28 pages. v2: minor corrections, version to appear in the Israel Journal of Mathematics
Recommandations aux auteurs publiant à la Romisch-Germanische Kommission
Creators: name: Redaktion, Die
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: -
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 89 2011(2013)
Rotating Casimir systems: magnetic-field-enhanced perpetual motion, possible realization in doped nanotubes, and laws of thermodynamics
Creators: name: Chernodub, M. N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently, we have demonstrated that for a certain class of Casimir-type systems ("devices") the energy of zero-point vacuum fluctuations reaches its global minimum when the device rotates about a certain axis rather than remains static. This rotational vacuum effect may lead to the emergence of permanently rotating objects provided the negative rotational energy of zero-point fluctuations cancels the positive rotational energy of the device itself. In this paper, we show that for massless electrically charged particles the rotational vacuum effect should be drastically (astronomically) enhanced in the presence of a magnetic field. As an illustration, we show that in a background of experimentally available magnetic fields the zero-point energy of massless excitations in rotating torus-shaped doped carbon nanotubes may indeed overwhelm the classical energy of rotation for certain angular frequencies so that the permanently rotating state is energetically favored. The suggested "zero-point driven" devices -- which have no internally moving parts -- correspond to a perpetuum mobile of a new, fourth kind: They do not produce any work despite the fact that their equilibrium (ground) state corresponds to a permanent rotation even in the presence of an external environment. We show that our proposal is consistent with the laws of thermodynamics.
description: 19 pages, 11 figures; v2: extended discussions; analogy with split-ring metamaterials stressed; comments are always welcome
The current state of fractal billiards
Creators: name: Lapidus, Michel L.
name: Niemeyer, Robert G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 28A80, 37D40, 37D50 (Primary) 28A75, 37C27, 37E35, 37F40, 58J99 (Secondary)

description: If D is a rational polygon, then the associated rational billiard table is given by Ω(D). Such a billiard table is well understood. If F is a closed fractal curve approximated by a sequence of rational polygons, then the corresponding fractal billiard table is denoted by Ω(F). In this paper, we survey many of the results from [LapNie1-3] for the Koch snowflake fractal billiard Ω(KS) and announce new results on two other fractal billiard tables, namely, the T-fractal billiard table Ω(T) (see [LapNie6]) and a self-similar Sierpinski carpet billiard table Ω(S_a) (see [CheNie]). We build a general framework within which to analyze what we call a sequence of compatible orbits. Properties of particular sequences of compatible orbits are discussed for each prefractal billiard Ω(KS_n), Ω(T_n) and Ω(S_a,n), for n = 0, 1, 2... . In each case, we are able to determine a particular limiting behavior for an appropriately formulated sequence of compatible orbits. Such a limit either constitutes what we call a nontrivial path of a fractal billiard table Ω(F) or else a periodic orbit of Ω(F) with finite period. In our examples, F will be either KS, T or S_a. Several of the results and examples discussed in this paper are presented for the first time. We then close with a brief discussion of open problems and directions for further research in the emerging field of fractal billiards.
description: 26 figures. his article is a survey of resent results, in addition to newly announced results, proofs for which are to appear in forthcoming papers; arXiv admin note: text overlap with arXiv:1204.3133
Zur Diskusson um die Farbverglasung des Domes zu Speyer
Creators: name: Frenzel, Gottfried
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 14 Nr. 1 (1961): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Pigott, Stuart: The neolithic cultures of the bristish Isles
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Pigott, Stuart: The neolithic cultures of the bristish Isles. A study of the Stone-using Agricultural Communities of Britain in the Second Millennium BC. Cambridge (University Press) 1954. 420 Seiten mit 63 Abb., XII Taf. und 1 Chronologie-Tabelle. Leinen
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 23 (1954): Nachrichten aus Niedersachsens Urgeschichte
Lullies, Reinhard: Neue Beiträge zur klassischen Altertumswissenschaft
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Lullies, Reinhard: Neue Beiträge zur klassischen Altertumswissenschaft. Festschrift zum 60. Geburtstag von Bernhard Schweitzer. Stuttgart (W. Kohlhammer) 1954. 419 S. Mit zahlreichen Abb. im Text und auf 91 Taf. Geb.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 24 (1955): Nachrichten aus Niedersachsens Urgeschichte
The Green Ring of Drinfeld Double $D(H_4)$
Creators: name: Chen, Hui-Xiang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 2010: 16E05, 16G99, 16T99

description: In this paper, we study the Green ring (or the representation ring) of Drinfeld quantum double $D(H_4)$ of Sweedler's 4-dimensional Hopf algebra $H_4$. We first give the decompositions of the tensor products of finite dimensional indecomposable modules into the direct sum of indecomposable modules over $D(H_4)$. Then we describe the structure of the Green ring $r(D(H_4))$ of $D(H_4)$ and show that $r(D(H_4))$ is generated, as a ring, by infinitely many elements subject to a family of relations.
description: Published online in Algebra and Representation Theory, 2013
Mariën, M.-E.: Inventaria archaeologica. Corpus des ensembles archéologiques
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Mariën, M.-E.: Inventaria archaeologica. Corpus des ensembles archéologiques. Ages des metaux France. Fase. I. Antwerpen (De Sikkel) 1954. 11 Taf. und 12 Erläuterungen
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 25 (1956): Nachrichten aus Niedersachsens Urgeschichte
Tischler, Fritz: Das Gräberfeld Oberjersdal, Kr. Hadersleben. 4. Beiheft zum Atlas der Urgeschichte
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Tischler, Fritz: Das Gräberfeld Oberjersdal, Kr. Hadersleben. 4. Beiheft zum Atlas der Urgeschichte. Herausgegeben von H. J. Eggers. Hamburg (Museum für Völkerkunde und Vorgeschichte) 1955. 11 Seiten mit 22 Taf.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 25 (1956): Nachrichten aus Niedersachsens Urgeschichte
Tricritical gravity waves in the four-dimensional generalized massive gravity
Creators: name: Moon, Taeyoon
name: Myung, Yun Soo
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct a generalized massive gravity by combining quadratic curvature gravity with the Chern-Simons term in four dimensions. This may be a candidate for the parity-odd tricritical gravity theory. Considering the AdS$_4$ vacuum solution, we derive the linearized Einstein equation, which is not similar to that of the three dimensional (3D) generalized massive gravity. When a perturbed metric tensor is chosen to be the Kerr-Schild form, the linearized equation reduces to a single massive scalar equation. At the tricritical points where two masses are equal to -1 and 2, we obtain a log-square wave solution to the massive scalar equation. This is compared to the 3D tricritical generalized massive gravity whose dual is a rank-3 logarithmic conformal field theory.
description: 17 pages, 1 figure, version to appear in EPJC
Transfinite inductions producing coanalytic sets
Creators: name: Vidnyánszky, Zoltán
Publisher: name: arXiv
Year: 2012
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics

description: A. Miller proved the consistent existence of a coanalytic two-point set, Hamel basis and MAD family. In these cases the classical transfinite induction can be modified to produce a coanalytic set. We generalize his result formulating a condition which can be easily applied in such situations. We reprove the classical results and as a new application we show that in $V=L$ there exists an uncountable coanalytic subset of the plane that intersects every $C^1$ curve in a countable set.
description: preliminary version
Γ-extensions of the spectrum of an orbifold
Creators: name: Farsi, Carla
name: Proctor, Emily
name: Seaton, Christopher
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 58J53, 57R18 (Primary) 53C20 (Secondary)

description: We introduce the Γ-extension of the spectrum of the Laplacian of a Riemannian orbifold, where Γis a finitely generated discrete group. This extension, called the Γ-spectrum, is the union of the Laplace spectra of the Γ-sectors of the orbifold, and hence constitutes a Riemannian invariant that is directly related to the singular set of the orbifold. We compare the Γ-spectra of known examples of isospectral pairs and families of orbifolds and demonstrate that it many cases, isospectral orbifolds need not be Γ-isospectral. We additionally prove a version of Sunada's theorem that allows us to construct pairs of orbifolds that are Γ-isospectral for any choice of Γ.
description: To appear in the Transactions of the AMS
SPECTROSCOPIC AND PHYSICAL PROPERTIES OF ATMOSPHERIC AEROSOL PARTICLES DURING HIGH-POLLUTION EVENTS IN SOUTHERN CALIFORNIA
Creators: name: Morales, Esther
Publisher: name: Zenodo
Year: 2023
Subjects: biomass burning
fireworks
aerosol size distribution
air quality
aerosol refractive index
Mie theory

description: High pollution events like biomass burning and fireworks are short lived but produce large amounts of atmospheric aerosol particulate matter that may affect human health and the Earth’s climate. Measuring spectroscopic properties of the particles, such as the refractive index of the particles, is important to better understand their impact on Earth’s radiative budget and to improve in situ and remote sensing studies. Measuring physical properties of the aerosol, such as the size and number of particles, and how particles transfer into the indoor environment is needed to better understand potential impacts on human health. This thesis focuses on two studies measuring ambient aerosol optical and physical properties during high-pollution events on the campus of California State University, Fullerton. The first study focused on wildfire events that occurred in Orange County, California in October of 2020 and the second study measured firework particles during July 4, 2021. The results show that ambient particle concentrations increased dramatically during the events. In addition, the particles efficiently penetrate to the indoor environment, with 76% and 68% of the biomass burning and fireworks particles entering the indoor environment, respectively. The spectroscopic properties of the particles during both events were measured at a wavelength of 450 nm and were used to retrieve the refractive indices, n and k, of the particles. In both the wildfire and fireworks events, the particles were observed to absorb light, indicating the potential to increase Earth’s temperature. A third study describing the development of a laboratory-based Cavity Enhanced Aerosol Spectrometer (CEAS) is discussed. Results show that the measured aerosol spectroscopic properties were reasonable but did not match expected values calculated from Mie theory, indicating that further work in developing the instrument is needed.
Barner, Wilhelm: Heimatatlas des Kreises Alfeld, l.Teil. Ur- und Frühgeschichte in Bild und Wort
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: Rezension zu: Barner, Wilhelm: Heimatatlas des Kreises Alfeld, l.Teil. Ur- und Frühgeschichte in Bild und Wort. Schriftenreihe des Heimatmuseums Alfeld Nr. 5. 30 S. mit 55 Abb., 1 Bildtafel und 1 Karte. Alfeld 1957
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 26 (1957): Nachrichten aus Niedersachsens Urgeschichte
India's Healthcare Market
Creators: name: Amir Ullah Khan, Netheena Mathews
Publisher: name: Zenodo
Year: 2021
Subjects: HEALTHCARE MARKET
BUSINESS OPPORTUNITES

description: India’s country’s health infrastructure is over-stretched and needs to be strengthened if it has to take on the challenges of the twenty-first century and help the country reap the benefits of its demographic dividend. On the other hand, India’s healthcare industry is also one of its fastest growing sectors – projected to reach $372 billion by 2022. The current paper will provide a brief analysis of the country’s health systems and policy landscape, and explore challenges and opportunities for the way forward for the healthcare industry. The paper will cover the healthcare market which develops and provides products, solutions, and/or services for diagnosis, treatment, and prevention. It will outline growth drivers, challenges, regulatory environment, market trends and competition in key segments.