cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Physical Interpretation of the Angle Dependent Magnetic Helicity Spectrum in the Solar Wind: The Nature of Turbulent Fluctuations near the Proton Gyroradius Scale
Creators: name: Klein, Kristopher G.
name: Howes, Gregory G.
name: TenBarge, Jason M.
name: Podesta, John J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Motivated by recent observations of distinct parallel and perpendicular signatures in magnetic helicity measurements segregated by wave period and angle between the local magnetic field and the solar wind velocity, this paper undertakes a comparison of three intervals of \emph{Ulysses} data with synthetic time series generated from a physically motivated turbulence model. From these comparisons, it is hypothesized that the observed signatures result from a perpendicular cascade of \Alfvenic fluctuations and a local, non-turbulent population of ion cyclotron or whistler waves generated by temperature anisotropy instabilities. By constraining the model's free parameters through comparison to \emph{in situ} data, it is found that, on average, $ \sim 95\%$ of the power near dissipative scales is contained in a perpendicular \Alfvenic cascade and that the parallel fluctuations are propagating nearly unidirectionally. The effects of aliasing on magnetic helicity measurements are considered and shown to be significant near the Nyquist frequency.
description: 26 Pages, 9 figures; Accepted for Publication in the Astrophysical Journal
Optical Properties of Relativistic Plasma Mirrors
Creators: name: Vincenti, H.
name: Monchocé, S.
name: Kahaly, S.
name: Martin, Ph.
name: Quéré, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The advent of ultrahigh-power femtosecond lasers creates a need for optical components suitable to handle ultrahigh light intensities. Due to the unavoidable laser-induced ionization of matter, these components will have to be based on a plasma medium. An archetype of such optical elements is a plasma mirror, created when an intense femtosecond laser pulse impinges on a solid target. It consists of a dense plasma, formed by the laser field itself, which specularly reflects the main part of the pulse. Plasma mirrors have major potential applications as active optical elements to manipulate the temporal and spatial properties of intense laser beams, in particular for the generation of intense attosecond pulses of light. We investigate the basic physics involved in the deformation of a plasma mirror resulting from the light pressure exerted by the ultraintense laser during reflection, by deriving a simple model of this fundamental process, which we validate both numerically and experimentally. The understanding of this deformation is essential for all future applications of plasma mirrors, especially for the generation of collimated attosecond beams. We show how its effect on the attosecond beam divergence can be mitigated by using the laser phase, thus providing crucial control for future applications in attosecond science.
description: 18 pages, 7 figures
Excitons and stacking order in h-BN
Creators: name: Bourrellier, Romain
name: Amato, Michele
name: Tizei, Luiz Henrique Galvão
name: Giorgetti, Christine
name: Gloter, Alexandre
name: Heggie, Malcolm I.
name: March, Katia
name: Stéphan, Odile
name: Reining, Lucia
name: Kociak, Mathieu
name: Zobelli, Alberto
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The strong excitonic emission at 5.75 eV of hexagonal boron nitride (h-BN) makes this material one of the most promising candidate for light emitting devices in the far ultraviolet (UV). However, single excitons occur only in perfect monocrystals that are extremely hard to synthesize, while regular h-BN samples present a complex emission spectrum with several additional peaks. The microscopic origin of these additional emissions has not yet been understood. In this work we address this problem using an experimental and theoretical approach that combines nanometric resolved cathodoluminescence, high resolution transmission electron microscopy and state of the art theoretical spectroscopy methods. We demonstrate that emission spectra are strongly inhomogeneus within individual flakes and that additional excitons occur at structural deformations, such as faceted plane folds, that lead to local changes of the h-BN stacking order.
Evolution of the hot flow of MAXI J1543-564
Creators: name: Rapisarda, S.
name: Ingram, A.
name: van der Klis, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a spectral and timing analysis of the black hole candidate MAXI J1543-564 during its 2011 outburst. As shown in previous work, the source follows the standard evolution of a black hole outburst. During the rising phase of the outburst we detect an abrupt change in timing behavior associated with the occurrence of a type-B quasi-periodic oscillation (QPO). This QPO and the simultaneously detected radio emission mark the transition between hard and soft intermediate state. We fit power spectra from the rising phase of the outburst using the recently proposed model propfluc. This assumes a truncated disc / hot inner flow geometry, with mass accretion rate fluctuations propagating through a precessing inner flow. We link the propfluc physical parameters to the phenomenological multi-Lorentzian fit parameters. The physical parameter dominating the QPO frequency is the truncation radius, while broad band noise characteristics are also influenced by the radial surface density and emissivity profiles of the flow. In the outburst rise we found that the truncation radius decreases from $r_o \sim 24$ to $10 R_g$, and the surface density increases faster than the mass accretion rate, as previously reported for XTE J1550-564. Two soft intermediate state observations could not be fitted with propfluc, and we suggest that they are coincident with the ejection of material from the inner regions of the flow in a jet or accretion of these regions into the BH horizon, explaining the drop in QPO frequency and suppression of broad band variability preferentially at high energy bands coincident with a radio flare.
description: 13 pages, 11 figures, 2 tables
ENBI Forums: final report (WP2_D2.10_12/2005)
Creators: name: Pando, Francisco
name: Pérez Iniesta, Elena
Publisher: name: Zenodo
Year: 2005
Subjects: biodiversity, European, information, communication, dissemination, virtual community

description: ENBI Forums, work package 2 of the European Network for Biodiversity Information (ENBI), developed a communication space and a set of resources and activities to bring together experts and end-users in specific fields of interest, facilitate information exchange and promote cooperation. The final report of ENBI Forums summarises the communication and dissemination activities of the Forum during the three years of ENBI's existence.
description: Citations and disclaimer:
This report may be freely used, copied, distributed etc., but credit must be given to the authors. The authors and the European Network for Biodiversity Information (ENBI) are responsible for the contents of this report, it does not represent the opinion of the European Commission and the European Commission is not responsible for any use that might be made of data from this ENBI report.
La Historia del Libro como campo de estudio en las Humanidades - The History of the Book as a Field of Study within the Humanities
Creators: name: Willison, I R
Publisher: name: Zenodo
Year: 2018
Subjects: Historia del Libro, Humanidades
Book history, Humanities

description: Exposición sobre la historia del libro y su significado para las Humanidades en la última parte del siglo XX
Topographic Constraints on the Origin of the Equatorial Ridge on Iapetus
Creators: name: Garcia, Erika Lopez
name: Rivera-Valentin, Edgard G.
name: Schenk, Paul M.
name: Hammond, Noah P.
name: Barr, Amy C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Saturn's moon Iapetus has an equatorial ridge system, which may be as high as 20 km, that may have formed by endogenic forces, such as tectonic and convective forces, or exogenic processes such as debris infall. We use high-resolution topographic data to conduct a topographic analysis of the ridge, which suggests a predominantly triangular morphology, with some ridge face slopes reaching 40 degrees, allowing for an exogenic formation mechanism.
description: 13 pages, 2 figures, preprint submitted to Icarus
Organic Rankine Cycle Waste Heat Recovery for Turboshaft Engines of Turboelectric Aircraft
Creators: name:  DABO KREMPUS
name:   FABIO BELTRAME
name:   MATTEO MAJER
name:   CARLO MARIA DE SERVI
name:   MATTEO PINI
name:    ROELOF VOS
name:   PIERO COLONNA
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: PROPHY
SYSINT
HEPAEM

description: This paper presents a preliminary study about a combined-cycle engine based on a turboshaft engine and an organicRankine-cycle (ORC) bottoming unit to be used onboard an aircraft with a turboelectric propulsion system. The aim is to analyse whether benefits with respect to mission fuel consumption can be derived by employing such a combinedcycle engine when compared to a simple-cycle turboshaft engine. For this purpose, a multidisciplinary optimization framework is developed, incorporating models for the engine, ORC system, ORC turbine, heat exchangers, and mission analysis. This framework is coupled with an optimizer to identify the optimal combined-cycle engine design for minimum mission fuel consumption. The results suggest that fuel savings of around 4% are possible with the optimized system if compared to the aircraft employing turboshaft engines. Heat exchanger volume is identified as the most constraining parameter when it comes to combined-cycle performance. The analysis of the results suggests as aspects which might lead to further improvements the evaluation of other ORC architectures, working fluids and heat exchanger topologies.
Networked control systems: a perspective from chaos
Creators: name: Zhang, Guofeng
name: Chen, Tongwen
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In this paper, a nonlinear system aiming at reducing the signal transmission rate in a networked control system is constructed by adding nonlinear constraints to a linear feedback control system. Its stability is investigated in detail. It turns out that this nonlinear system exhibits very interesting dynamical behaviors: in addition to local stability, its trajectories may converge to a non-origin equilibrium or be periodic or just be oscillatory. Furthermore it exhibits sensitive dependence on initial conditions --- a sign of chaos. Complicated bifurcation phenomena are exhibited by this system. After that, control of the chaotic system is discussed. All these are studied under scalar cases in detail. Some difficulties involved in the study of this type of systems are analyzed. Finally an example is employed to reveal the effectiveness of the scheme in the framework of networked control systems.
description: 46 pages, 19 figures, 2 tables
Headless Chrome Automation with the crrri package
Creators: name: Lesur, Romain
Publisher: name: Zenodo
Year: 2019
Subjects: browsers
automation
webscraping

description: Headless Chrome is a headless web browser that became extremely popular thanks to the node.js chrome-remote-interface and puppeteer libraries. A headless web browser can be used for different goals: web scrapping, testing web applications (e.g. for Shiny apps), screenshots or PDF generation of web pages. Several R packages as RSelenium and webdriver offer high-level interfaces to headless web browsers. In this communication, we will present an R package named crrri that provides a low-level interface to headless Chrome using the Chrome Developer Protocol. It offers an access to the most advanced features of headless Chrome from R. The crrri package has small system dependencies: the only dependency is Chromium/Chrome. Its API is close to node.js libraries: node.js scripts for headless Chrome can be easily transcripted in R. Through several examples, we show different applications of headless Chrome.
Principal Component Analysis of Molecular Clouds: Can CO reveal the dynamics?
Creators: name: Bertram, Erik
name: Shetty, Rahul
name: Glover, Simon C. O.
name: Klessen, Ralf S.
name: Roman-Duval, Julia
name: Federrath, Christoph
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We use Principal Component Analysis (PCA) to study the gas dynamics in numerical simulations of typical MCs. Our simulations account for the non-isothermal nature of the gas and include a simplified treatment of the time-dependent gas chemistry. We model the CO line emission in a post-processing step using a 3D radiative transfer code. We consider mean number densities n_0 = 30, 100, 300 cm^{-3} that span the range of values typical for MCs in the solar neighbourhood and investigate the slope α_{PCA} of the pseudo structure function computed by PCA for several components: the total density, H2 density, 12CO density, 12CO J = 1 -> 0 intensity and 13CO J = 1 -> 0 intensity. We estimate power-law indices α_{PCA} for different chemical species that range from 0.5 to 0.9, in good agreement with observations, and demonstrate that optical depth effects can influence the PCA. We show that when the PCA succeeds, the combination of chemical inhomogeneity and radiative transfer effects can influence the observed PCA slopes by as much as ~ +/- 0.1. The method can fail if the CO distribution is very intermittent, e.g. in low-density clouds where CO is confined to small fragments.
description: 12 pages, 8 figures, accepted for publication in MNRAS
Confinement-driven transitions between topological and Mott phases in (LaNiO3)$_N$/(LaAlO3)$_M$(111) superlattices
Creators: name: Doennig, David
name: Pickett, Warren E.
name: Pentcheva, Rossitza
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A set of broken symmetry two-dimensional ground states are predicted in (111)-oriented (LaNiO$_3$)$_N$/(LaAlO$_3$)$_M$ ($N$/$M$) superlattices, based on density functional theory (DFT) calculations including a Hubbard $U$ term. An unanticipated Jahn-Teller distortion with $d_{z^2}$ orbital polarization and a FM Mott insulating (and multiferroic) phase emerges in the double perovskite (1/1), that shows strong susceptibility to strain-controlled orbital engineering. The LaNiO$_3$ bilayer with graphene topology has a switchable multiferroic (ferromagnetic (FM) and ferroelectric) insulating ground state with inequivalent Ni sites. Beyond $N=3$ the confined LaNiO$_3$ slab undergoes a metal-to-insulator transition through a half-semimetallic phase with conduction originating from the interfaces. Antiferromagnetic arrangements allow combining motifs of the bilayer and single trigonal layer band structures in designed artificial mixed phases.
description: Physical Review B: Rapid Communications (in press)
A real-space study of random extended defects in solids : application to disordered Stone-Wales defects in graphene
Creators: name: Chowdhury, Suman
name: Baidya, Santu
name: Nafday, Dhani
name: Haldar, Soumyajyoti
name: Kabir, Mukul
name: Sanyal, Biplab
name: Saha-Dasgupta, Tanusri
name: Jana, Debnarayan
name: Mookerjee, Abhijit
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose here a first-principles, parameter free, real space method for the study of disordered extended defects in solids. We shall illustrate the power of the technique with an application to graphene sheets with randomly placed Stone-Wales defects and shall examine the signature of such random defects on the density of states as a function of their concentration. The technique is general enough to be applied to a whole class of systems with lattice translational symmetry broken not only locally but by extended defects and defect clusters. The real space approach will allow us to distinguish signatures of specific defects and defect clusters.
description: 11 pages, 24 figures
A Field Guide to Sanctuary: Women’s Experiences of Personal Sanctuary Contextualised Within Chronic Health Conditions
Creators: Deatherage, Colleen
Publisher: name: University of Alberta Library
Year: 2022

This analytic autoethnography draws on a passage from Celtic philosopher John O’Donohue to consider women’s experience of personal sanctuary within the context of chronic health conditions. Guided by the question: ‘what is your experience of sanctuary and how does that relate to your experience of your chronic health condition’ and informed heavily by social work theory and practice, this dissertation engages a range of research methodologies and methods, including Critical Reflection on Practice and Response Art (from art therapy) in conjunction with participant interviews. Through the constant comparative method, the data revealed that within this context, sanctuary comprises elements (spirituality, nature, creativity, and purposeful occupation), as well as qualities (transgressiveness, nourishingness, and fluidity). This research not only revealed the structure of sanctuary, it assisted the author to understand sanctuary as her personal ministry and fundamental to her social work practice, as well as clarifying the spiritual practices leading to her experience of sanctuary. This dissertation concludes with many plans for future study, including the possibility of this type of sanctuary as a social work practice framework.
Reproducible Corporate Publications using pagedown
Creators: name: Lesur, Romain
Publisher: name: Zenodo
Year: 2019
Subjects: literate programming

description: The pagedown package is a new package for producing PDF documents from R Markdown. It uses a different technology stack: PDF documents are created using a web browser and HTML/CSS. It offers a new opportunity for creating reproducible publications and is well adapted to design corporate publications. Using HTML and CSS for print documents is an opportunity for organizations that already possess skills in web design: they can re-use these skills to design print documents. This communication presents, based on several examples, the different steps for developing a template compliant with a corporate design.
Bahasa Indonesia bagi Penutur Asing (BIPA)
Creators: name: Mulyaningsih, Indrya
Publisher: name: Zenodo
Year: 2020
Subjects: BIPA, Cirebon, Indonesia, pengajaran, tadris

description: Disampaikan pada SEMINAR KEPAKARAN BIPA DAN JURNALISTIK (SEMARPATIK) yang diselenggarakan oleh Himpunan Mahasiswa Jurusan Tadris Bahasa Indonesia, Fakultas Ilmu Tarbiyah dan Keguruan, IAIN Syekh Nurjati Cirebon pada Rabu, 18 November 2020
Disaster Recovery Using Virtual Machines
Creators: name: Mirzoev, Dr. Timur
Publisher: name: arXiv
Year: 2014
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Today, the importance of having 100% uptime for businesses and industries is clear: financial reasons and often strict government regulations for certain industries require 100% business continuity. The concept of business continuity (BC), as Microsoft defines it: the ability of an organization to continue to function even after a disastrous event, accomplished through the deployment of redundant hardware and software, the use of fault tolerant systems, as well as a solid backup and recovery strategy, directly relates to an organization s ability to quickly restore and deploy IT backups and business operations in a short period of time.
V1117 Her: A Herbig Ae star at high Galactic latitude?
Creators: name: Kun, M.
name: Rácz, M.
name: Szabados, L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We examine the long-term light curve, optical spectrum, spectral energy distribution, and Galactic location of V1117 Her in order to establish its nature. V1117 Her is most probably a young intermediate-mass star whose cyclic brightness dimmings are caused by changing circumstellar dust structures.
description: 8 pages, 5 figures
Triple trouble for XZ Tau: deep imaging with the Jansky Very Large Array
Creators: name: Forgan, D.
name: Ivison, R. J.
name: Sibthorpe, B.
name: Greaves, J. S.
name: Ibar, E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new observations of the XZ Tau system made at high angular resolution (55 milliarcsec) with the Karl G. Jansky Very Large Array (VLA) at a wavelength of 7 mm. Observations of XZ Tau made with the VLA in 2004 appeared to show a triple system, with XZ Tau A resolved into two sources, XZ Tau A and XZ Tau C. The angular separation of XZ Tau A and C (0.09 arcsec) suggested a projected orbital separation of around 13 AU with a possible orbital period of around 40 yr. Our observations were obtained approximately 8 yr later, a fifth of this putative orbital period, and should therefore allow us to constrain the orbit of XZ Tau C, and evaluate the possibility that a recent periastron passage of C coincided with the launch of extended optical outflows from XZ Tau A. Despite improved sensitivity and resolution compared with previous observations, we find no evidence of XZ Tau C in our data. Components A and B are detected with a signal-to-noise ratio greater than ten; their orbits are consistent with previous studies, although the emission from XZ Tau A appears to be weaker. Three possible interpretations are offered: either XZ Tau C is transiting XZ Tau A, which is broadly consistent with the periastron passage hypothesis, or the emission seen in 2004 was that of a transient, or XZ Tau C does not exist. A fourth interpretation, that XZ Tau C was ejected from the system, is dismissed due to the lack of angular momentum redistribution in the orbits of XZ Tau A and XZ Tau B that would result from such an event. Our observations are insufficient to distinguish between the remaining possibilities, at least not until we obtain further VLA observations at a sufficiently later time. A further non-detection would allow us to reject the transit hypothesis, and the periastron passage of XZ Tau C as agent of XZ Tau A's outflows.
description: 4 pages, 4 figures, accepted for publication in MNRAS
Generation of a coherent near-infrared Kerr frequency comb in a monolithic microresonator with normal GVD
Creators: name: Liang, Wei
name: Savchenkov, Anatoliy A.
name: Ilchenko, Vladimir S.
name: Eliyahu, Danny
name: Seidel, David
name: Matsko, Andrey B.
name: Maleki, Lute
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate experimentally, and explain theoretically, generation of a wide, fundamentally phase locked Kerr frequency comb in a nonlinear resonator with a normal group velocity dispersion. A magnesium fluoride whispering gallery resonator characterized with 10 GHz free spectral range and pumped either at 780 nm or 795 nm is used in the experiment. The envelope of the observed frequency comb differs significantly from the Kerr frequency comb spectra reported previously. We show via numerical simulation that, while the frequency comb does not correspond to generation of short optical pulses, the relative phases of the generated harmonics are fixed.
description: 5 pages, 5 figures, to appear in Optics Letters
A population synthesis study of the luminosity function of hot white dwarfs
Creators: name: Torres, S.
name: García-Berro, E.
name: Krzesinski, J.
name: Kleinman, S. J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a coherent and detailed Monte Carlo simulation of the population of hot white dwarfs. We assess the statistical significance of the hot end of the white dwarf luminosity function and the role played by the bolometric corrections of hydrogen-rich white dwarfs at high effective temperatures. We use the most up-to-date stellar evolutionary models and implement a full description of the observational selection biases to obtain realistic simulations of the observed white dwarf population. Our theoretical results are compared with the luminosity function of hot white dwarfs obtained from the Sloan Digital Sky Survey (SDSS), for both DA and non-DA white dwarfs. We find that the theoretical results are in excellent agreement with the observational data for the population of white dwarfs with hydrogen deficient atmospheres (non-DA white dwarfs). For the population of white dwarfs with hydrogen-rich atmospheres (white dwarfs of the DA class), our simulations show some discrepancies with the observations for the brightest luminosity bins. These discrepancies can be attributed to the way in which the masses of the white dwarfs contributing to this luminosity bin have been computed, as most of them have masses smaller than the theoretical lower limit for carbon-oxygen white dwarfs. We conclude that the way in which the observational luminosity function of hot white dwarfs is obtained is very sensitive to the particular implementation of the method used to derive the masses of the sample. We also provide a revised luminosity function for hot white dwarfs with hydrogen-rich atmospheres.
description: 6 pages, 5 figures, accepted for publication in A&A
Indicadores de Participación Ciudadana desde una perspectiva de responsabilidad en la ciencia y la innovación: el caso español
Creators: name: García-Melón, Mónica
name: Gonzalez‐Urango, Hannia
Publisher: name: Zenodo
Year: 2019
Subjects: Participación ciudadana, participación pública, public engagement, compromiso público, indicadores, Proceso Analítico Jerárquico, AHP, Investigación e Innovación Responsable, RRI

description: El proyecto INPERRI tiene como principal objetivo la obtención de un panel de indicadores adaptado al contexto español que permita monitorizar la innovación y ciencia desde una perspectiva RRI. Este documento presenta los resultados del proyecto para el área de Participación ciudadana. Ingenio Working Paper Series, Working Paper Nº 2019/02.
description: Ha sido elaborado en el marco de los proyectos: "Propuesta de indicadores para impulsar el diseño de una política orientada al desarrollo de la Investigación e Innovación Responsable en España" – INPERRI 2016-2019, financiado por el Ministerio de Economía, Industria y Competitividad (https://inperri.webs.upv.es/) y "Propuesta de indicadores para impulsar el diseño de una política científica e innovadora en la Comunidad Valenciana basada en los principios de la Investigación e Innovación Responsables" – RRICVAL 2018-2019, financiado por la Generalitat Valenciana".
Social Collaborative Retrieval
Creators: name: Hsiao, Ko-Jen
name: Kulesza, Alex
name: Hero, Alfred
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Socially-based recommendation systems have recently attracted significant interest, and a number of studies have shown that social information can dramatically improve a system's predictions of user interests. Meanwhile, there are now many potential applications that involve aspects of both recommendation and information retrieval, and the task of collaborative retrieval---a combination of these two traditional problems---has recently been introduced. Successful collaborative retrieval requires overcoming severe data sparsity, making additional sources of information, such as social graphs, particularly valuable. In this paper we propose a new model for collaborative retrieval, and show that our algorithm outperforms current state-of-the-art approaches by incorporating information from social networks. We also provide empirical analyses of the ways in which cultural interests propagate along a social graph using a real-world music dataset.
description: 10 pages
Secants of minuscule and cominuscule minimal orbits
Creators: name: Manivel, Laurent
name: Michałek, Mateusz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14M15, 14M17, 14L30

description: We study the geometry of the secant and tangential variety of a cominuscule and minuscule variety, e.g. a Grassmannian or a spinor variety. Using methods inspired by statistics we provide an explicit local isomorphism with a product of an affine space with a variety which is the Zariski closure of the image of a map defined by generalized determinants. In particular, equations of the secant or tangential variety correspond to relations among generalized determinants. We also provide a representation theoretic decomposition of cubics in the ideal of the secant variety of any Grassmannian.
Landau gauge gluon and ghost propagators from two-flavor lattice QCD at T > 0
Creators: name: Aouane, R.
name: Burger, F.
name: Muller-Preussker, M.
name: Ilgenfritz, E. -M.
name: Sternbeck, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this contribution we extend our unquenched computation of the Landau gauge gluon and ghost propagators in lattice QCD at non-zero temperature. The study was aimed at providing input for investigations employing continuum functional methods. We show data which correspond to pion mass values between 300 and 500 MeV and are obtained for a lattice size 32**3 x 12. The longitudinal and transversal components of the gluon propagator turn out to change smoothly through the crossover region, while the ghost propagator exhibits only a very weak temperature dependence. For a pion mass of around 400 MeV and the intermediate temperature value of approx. 240 MeV we compare our results with additional data obtained on a lattice with smaller Euclidean time extent N_t = 8, 10 and find a reasonable scaling behavior.
description: 6 pages, 3 figures; LATTICE '13, Mainz (2013) - poster contribution
Wireless Transmission of Video for Biomechanical Analysis
Creators: name: Mirzoev, Dr. Timur
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Multimedia (cs.MM)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: When there is a possibility to wirelessly stream video over a network, a sophisticated computer analysis of the transmitted video is possible. Such process is used in biomechanics when it is important to analyze athletes performance via streaming digital uncompressed video to a computer and then analyzing it using specific software such as Arial Performance Analysis Systems or Dartfish. This manuscript presents some approaches and challenges in streaming video as well as some applications of Information Technology in biomechanics. An example of how scientists from Indiana State University approached the wireless transmission of video is also introduced.
Integrability of the bi-Yang-Baxter sigma-model
Creators: name: Klimcik, C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 70S99

description: We construct a Lax pair with spectral parameter for a two-parameter doubly Poisson-Lie deformation of the principal chiral model.
description: 14 pages
Perturbative approach to the dynamics of a trapped ion interacting with a light field
Creators: name: Penna, Vittorio
name: Raffa, Francesco
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a second-order perturbative analysis of the model describing a two-level trapped ion interacting with a traveling laser field, in the Lamb-Dicke regime. Unlike the customary approach, based on the interaction picture and the rotating wave approximation, we reduce the original Hamiltonian to a time-independent model, unitarily equivalent to a spin-boson model, which features a form well suited to apply the perturbation theory. We determine the first and second-order corrections of eigenstates and eigenvalues. By varying the interaction parameters we identify four regimes characterized by different eigenvalue distributions (possibly including level doublets) and suggest the presence of an intermediate regime where the spectrum undergoes macroscopic changes. In this regime, where the perturbation approach does not hold, our reduced Hamiltonian is shown to reproduce the Jaynes-Cummings model.
description: 9 pages, to appear on J.Phys. B
Universal quasinormal modes of large D black holes
Creators: name: Emparan, Roberto
name: Tanabe, Kentaro
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that in the limit where the number of spacetime dimensions D grows to infinity a very large class of black holes (including non-extremal, static, asymptotically flat ones, with any number of gauge-field charges, possibly coupled to dilatons) possess a universal set of quasinormal modes whose complex frequencies depend only on the horizon radius and no other black hole parameters. The damping ratio of these modes vanishes like $D^{-2/3}$, so they are almost normal modes, or 'quasi-particle' excitations of the black hole. The structure responsible for the existence of these modes at large D is also present very generally in other black holes.
description: 6 pages, 1 figure
Analysis of Computer Hardware Affecting Video Transmission via IEEE 1394a connection
Creators: name: Mirzoev, Dr. Timur
Publisher: name: arXiv
Year: 2014
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: When 60 de-interlaced fields per second digital uncompressed video is streamed to a computer, some video fields are lost and not able to be stored on a computer s hard drive successfully. Additionally, this problem amplifies once multiple video sources are deployed. If it is possible to stream digital uncompressed video without dropped video fields, then a sophisticated computer analysis of the transmitted via IEEE 1394a connection video is possible. Such process is used in biomechanics when it is important to analyze athletes performance via streaming digital uncompressed video to a computer and then analyzing it. If a loss of video fields occurs, then a quality analysis of video is not possible.
Detecting gravitational waves from the galactic center with Pulsar Timing
Creators: name: Ray, Alak
name: Kocsis, Bence
name: Zwart, Simon Portegies
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Black holes orbiting the Super Massive Black Hole (SMBH) Sgr A* in the Milky-way galaxy center (GC) generate gravitational waves. The spectrum, due to stars and black holes, is continuous below 40 nHz while individual BHs within about 200 AU of the central SMBH stick out in the spectrum at higher frequencies. The GWs can be detected by timing radio pulsars within a few parsecs of this region. Future observations with the Square Kilometer Array of such pulsars with sufficient timing accuracy may be sensitive to signals from intermediate mass BHs (IMBH) in a 3 year observation baseline. The recent detection of radio pulsations from the magnetar SGR J1745-29 very near the GC opens up the possibilities of detecting millisecond pulsars (which can be used as probes of the GWs) through lines of sight with only moderate pulse and angular broadening due to scattering.
description: 4 pages, 1 figure. Paper presented at the IAU Symposium 303 on the Galactic Center at Santa Fe, N.M., USA, October 2013. A similar version was also read at the Gravitational Wave Physics and Astronomy Workshop 2013 at IUCAA, Pune, India, December 17-20, 2013
Using Peano Curves to Construct Laplacians on Fractals
Creators: name: Molitor, Denali
name: Ott, Nadia
name: Strichartz, Robert
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We describe a new method to construct Laplacians on fractals using a Peano curve from the circle onto the fractal, extending an idea that has been used in the case of certain Julia sets. The Peano curve allows us to visualize eigenfunctions of the Laplacian by graphing the pullback to the circle. We study in detail three fractals: the pentagasket, the octagasket and the magic carpet. We also use the method for two nonfractal self-similar sets, the torus and the equilateral triangle, obtaining appealing new visualizations of eigenfunctions on the triangle. In contrast to the many familiar pictures of approximations to standard Peano curves, that do no show self-intersections, our descriptions of approximations to the Peano curves have self-intersections that play a vital role in constructing graph approximations to the fractal with explicit graph Laplacians that give the fractal Laplacian in the limit.
Global population attributable fraction of potentially modifiable risk factors for mental disorders: a meta-umbrella systematic review.
Creators: name: Dragioti, Elena
name: Radua, Joaquim
name: Solmi, Marco
name: Arango, Celso
name: Oliver, Dominic
name: Cortese, Samuele
name: Jones, Peter B
name: Il Shin, Jae
name: Correll, Christoph U
name: Fusar-Poli, Paolo
Publisher: name: Apollo - University of Cambridge Repository
Year: 2022
Subjects: Child
Female
Humans
Pregnancy
Incidence
Mental Disorders
Prospective Studies
Psychotic Disorders
Risk Factors
Meta-Analysis as Topic

description: Numerous risk factors for mental disorders have been identified. However, we do not know how many disorders we could prevent and to what extent by modifying these risk factors. This study quantifies the Population Attributable Fraction (PAF) of potentially modifiable risk factors for mental disorders. We conducted a PRISMA 2020-compliant (Protocol: https://osf.io/hk2ag ) meta-umbrella systematic review (Web of Science/PubMed/Cochrane Central Register of Reviews/Ovid/PsycINFO, until 05/12/2021) of umbrella reviews reporting associations between potentially modifiable risk factors and ICD/DSM mental disorders, restricted to highly convincing (class I) and convincing (class II) evidence from prospective cohorts. The primary outcome was the global meta-analytical PAF, complemented by sensitivity analyses across different settings, the meta-analytical Generalised Impact Fraction (GIF), and study quality assessment (AMSTAR). Seven umbrella reviews (including 295 meta-analyses and 547 associations) identified 28 class I-II risk associations (23 risk factors; AMSTAR: 45.0% high-, 35.0% medium-, 20.0% low quality). The largest global PAFs not confounded by indication were 37.84% (95% CI = 26.77-48.40%) for childhood adversities and schizophrenia spectrum disorders, 24.76% (95% CI = 13.98-36.49%) for tobacco smoking and opioid use disorders, 17.88% (95% CI = not available) for job strain and depression, 14.60% (95% CI = 9.46-20.52%) for insufficient physical activity and Alzheimer's disease, 13.40% (95% CI = 7.75-20.15%) for childhood sexual abuse and depressive disorders, 12.37% (95% CI = 5.37-25.34%) for clinical high-risk state for psychosis and any non-organic psychotic disorders, 10.00% (95% CI = 5.62-15.95%) for three metabolic factors and depression, 9.73% (95% CI = 4.50-17.30%) for cannabis use and schizophrenia spectrum disorders, and 9.30% (95% CI = 7.36-11.38%) for maternal pre-pregnancy obesity and ADHD. The GIFs confirmed the preventive capacity for these factors. Addressing several potentially modifiable risk factors, particularly childhood adversities, can reduce the global population-level incidence of mental disorders.
The physics of a walking robot
Creators: name: Güémez, Julio
name: Fiolhais, Manuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: The physics of walking is explored, using a toy as a concrete example and a 'toy' model applied to it. Besides the Newton's second law, the problem is also discussed from the thermodynamical perspective. Once the steady state (constant velocity) is achieved, we show that the internal energy of the toy is dissipated as heat in the surroundings.
description: 6 pages, 3 figures
Photon asymmetries in $nd\rightarrow$ $^3Hγ$ using EFT($π/!/!/!/$) approach
Creators: name: Arani, M. Moeini
name: Bayegan, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The parity-violating Lagrangian of the weak nucleon-nucleon ($NN$) interaction in the pionless effective field theory (EFT($//!/!/!/pi$)) approach contains five independent unknown low-energy coupling constants (LECs). The photon asymmetry with respect to neutron polarization in $np\rightarrow$ $dγ$ $A^{np}_γ$, the circular polarization of outgoing photon in $np\rightarrow$ $dγ$ $P^{np}_γ$, the neutron spin rotation in hydrogen $\frac{1}ρ\frac{dϕ^{np}}{dl}$, the neutron spin rotation in deuterium $\frac{1}ρ\frac{dϕ^{nd}}{dl}$ and the circular polarization of $γ$-emission in $nd\rightarrow$ $^3Hγ$ $P^{nd}_γ$ are the parity-violating observables which have been recently calculated in terms of parity-violating LECs in the EFT($//!/!/!/pi$) framework. We obtain the LECs by matching the parity-violating observables to the Desplanques, Donoghue, and Holstein (DDH) best value estimates. Then, we evaluate photon asymmetry with respect to the neutron polarization $a^{nd}_γ$ and the photon asymmetry in relation to deuteron polarization $A^{nd}_γ$ in $nd\rightarrow$ $^3Hγ$ process. We finally compare our EFT($//!/!/!/pi$) photon asymmetries results with the experimental values and the previous calculations based on the DDH model.
All Weather Calibration of Wide Field Optical and NIR Surveys
Creators: name: Burke, David L.
name: Saha, Abhijit
name: Claver, Jenna
name: Axelrod, T.
name: Claver, Chuck
name: DePoy, Darren
name: Ivezic, Zeljko
name: Jones, Lynne
name: Smith, R. Chris
name: Stubbs, Christopher W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The science goals for ground-based large-area surveys, such as the Dark Energy Survey, Pan-STARRS, and the Large Synoptic Survey Telescope, require calibration of broadband photometry that is stable in time and uniform over the sky to precisions of a per cent or better. This performance will need to be achieved with data taken over the course of many years, and often in less than ideal conditions. This paper describes a strategy to achieve precise internal calibration of imaging survey data taken in less than photometric conditions, and reports results of an observational study of the techniques needed to implement this strategy. We find that images of celestial fields used in this case study with stellar densities of order one per arcmin-squared and taken through cloudless skies can be calibrated with relative precision of 0.5 per cent (reproducibility). We report measurements of spatial structure functions of cloud absorption observed over a range of atmospheric conditions, and find it possible to achieve photometric measurements that are reproducible to 1 per cent in images that were taken through cloud layers that transmit as little as 25 per cent of the incident optical flux (1.5 magnitudes of extinction). We find, however, that photometric precision below 1 per cent is impeded by the thinnest detectable cloud layers. We comment on implications of these results for the observing strategies of future surveys.
description: Accepted for publication in The Astronomical Journal (AJ)
Tending the Money Wound: A Performative Autoethnography of Testimony
Creators: Powell, Kevin
Publisher: name: University of Alberta Library
Year: 2022

As churches and other ministries struggle with financial shortfalls due to COVID-19 and other socio-religious reasons, many church leaders are anxious about becoming under-resourced. Funding is quickly becoming an urgent challenge, and many churches and ministries are either restructuring to soften the crisis or closing altogether. To explore this challenge from a personal and professional lens, I wrote and preached a sermon series using first-person testimonial preaching through the performative autoethnography method. In the series I explored the concept of the “money wound” as it pertains to revenue generation among church leaders, particularly within my own narrative. Data was collected through the sermon series. Reflections on the sermon series expanded the narrative of the series while also self-consciously examining the quality of the sermon, discussing whether the stories in the series met their intent. Implications for further research and practice are for first-person narrative preaching and sermons about money, as well as stewardship conversation and planning, ecclesial structural renewal, and further reflection on the spirituality of money.
Low Rate Wireless Personal Area Networks (LR-WPAN 802.15.4 standard)
Creators: name: Mirzoev, Dr. Timur
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This manuscript will provide a brief overview on Low Rate Wireless Personal Area Networks (LR-WPAN) for 802.15.4 protocol standard which was approved by IEEE Computer Society in May 2003. 802.15.4 standard presents some advantages for structuring sensor networks and other types of applications that require low rate communications. Some security considerations will also be presented.
Critical and Gaussian conductivity fluctuations in BaFe1.9Ni0.1As2 superconductor
Creators: name: Salem-Sugui,, S.
name: Alvarenga, A. D.
name: Rey, R. I.
name: Mosqueira, J.
name: Luo, H-Q
name: Lu, X-Y
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study fluctuation conductivity in a single crystal of BaFe$_{1.9}$Ni$_{0.1}$As$_2$ superconductor ($T_c$ = 20 K) as a function of temperature and applied magnetic field. Magneto-conductivity curves, $Δσ$ vs. $T$, were analyzed in terms of -1/(dln($Δσ$)/d$T$) vs. $T$ plots, which allow to study different fluctuations regimes and to estimate exponent values and temperature widths of each regime. The analysis of magneto-conductivity curves evidence the existence of only two fluctuations regimes, a possible critical one (of glass-like type) going from the irreversible temperature to above $T_c(H)$ followed by Aslamazov-Larkin fluctuations in the Gaussian regime.
description: 6 pages, 4 figures
The existence of greedy bases in rank 2 quantum cluster algebras
Creators: name: Lee, Kyungyong
name: Li, Li
name: Rupel, Dylan
name: Zelevinsky, Andrei
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13F60

description: We establish the existence of a quantum lift of the greedy basis.