cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Typology of Martial Arts Scholar–Practitioners: Types, Transitions, and Tensions in Capoeira
Creators: name: Contreras Islas, David Sebastian
name: Jennings, George
Publisher: name: Humboldt-Universität zu Berlin
Year: 2023
Subjects: subject: Capoeira
subject: ethnography
subject: martial arts studies
subject: positionality
subject: Spannungsfeld
subject: field of tension
subject: typology
subject: reflexivity
subject: co-production
subject: expertise
subject: 796 Sportarten und Sportspiele

description: Martial arts are concerned with continuous technical practice and refinement over a lifetime, while scholarship is ordinarily undertaken by active learners and experienced (occasionally veteran) practitioners. These martial arts scholar–practitioners tend to be positioned according to specific types, from a more distant (and sometimes critical) scholar with less combat acumen to an instructor keen to read and engage in collaborative research. This article introduces a typology of ten martial arts scholar–practitioner types: (1) Supportive Scholar; (2) Former Practitioner; (3) Practitioner on Stand-by; (4) Immersed Apprentice; (5) Budding Scholar–Practitioner; (6) Established Scholar–Practitioner; (7) Temporary Practitioner–Researcher; (8) Experimental Leader; (9) Inquisitive Teacher; and (10) Curious Practitioner. The types are examined using Capoeira, one of the most academically studied martial arts. Drawing on the Spannungsfeld—the “field of tension” between science and practice—we reveal the specific strengths and limitations of each type while illustrating the common transition between positions across a career or research project. Finally, we consider some practical solutions to mitigate the relative weaknesses and oversights of the specific types, including the ability to form teams of scholar–practitioners from different positions in academia and martial arts. We close with suggestions for empirical research to test and refine our methodological model.
A comparative study of farming and fishing households’ livelihood vulnerability in the Niger Delta, Nigeria
Creators: name: Onyenekwe, Chinasa Sylvia
name: Sarpong, Daniel Bruce
name: Egyir, Irene Susana
name: Opata, Patience Ifeyinwa
name: Oyinbo, Oyakhilomen
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Neuroscience
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Marine Biology

description: Multiple stressors such as climate shocks, environmental degradation and resource conflicts may pose a great challenge for African communities struggling to adapt to climate change. Yet, there is limited empirical evidence on the differential vulnerabilities of farming and fishing households to these triple stressors. Using a household survey in the Niger Delta region of Nigeria, we compare the vulnerability of farming and fishing households. We find that the farming households were more exposed to the triple stressors while the fishing households were more sensitive to the triple stressors owing to their poor physical and natural asset base. In addition, we find that the two groups share similar adaptive capacity and composite vulnerability scores. Overall, interventions such as credit schemes can enable fishing households to address their livelihood disruptions and build their asset endowment, and climate-responsive interventions such as early warning systems can partly reduce the climate exposure of farming households.
Focal Plane Alignment and Detector Characterization for the Subaru Prime Focus Spectrograph
Creators: name: Hart, Murdock
name: Barkhouser, Robert H.
name: Carr, Michael
name: Golebiowski, Mirek
name: Gunn, James E.
name: Hope, Stephen C.
name: Smee, Stephen A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We describe the infrastructure being developed to align and characterize the detectors for the Subaru Measurement of Images and Redshifts (SuMIRe) Prime Focus Spectrograph (PFS). PFS will employ four three-channel spectrographs with an operating wavelength range of 3800 $Å$ to 12600 $Å$. Each spectrograph will be comprised of two visible channels and one near infrared (NIR) channel, where each channel will use a separate Schmidt camera to image the captured spectra onto their respective detectors. In the visible channels, Hamamatsu 2k x 4k CCDs will be mounted in pairs to create a single 4k x 4k detector, while the NIR channel will use a single Teledyne 4k x 4k H4RG HgCdTe device.
description: 16 pages, 27 figures, SPIE ATI Montreal 2014
A sonic perspective for the post-pandemic future of entertainment districts: the case of Montreal’s Quartier des Spectacles
Creators: name: Di Croce, Nicola
name: Bild, Edda
name: Steele, Daniel
name: Guastavino, Catherine
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: In 2020, the pandemic impacted the social and economic dynamics of cities around the world. Entertainment districts hosting events, festivals, and other cultural activities were particularly affected, as their loss of attractiveness also impacted their livability. Reflecting on how the experience of the sonic environment contributes to attractiveness and livability in an urban environment, we propose a sonic perspective to investigate the impact of the COVID-19 pandemic in Montreal’s entertainment district – Quartier des Spectacles (QDS). Through semi-structured interviews, we focus on how the sonic experience of QDS’s residents changed throughout 2020, and on how their experiences can provide valuable insight into addressing the district’s future planning and management. Looking at QDS as a case study to orient the post-pandemic trajectories of entertainment districts, we present a number of sound-related governance recommendations aimed at strengthening QDS residents’ involvement in the neighborhood’s cultural, artistic, and political life and its decision-making processes.
Phase Transitions of Boron Carbide: Pair Interaction Model of High Carbon Limit
Creators: name: Yao, Sanxi
name: Huhn, W. P.
name: Widom, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Boron Carbide exhibits a broad composition range, implying a degree of intrinsic substitutional disorder. While the observed phase has rhombohedral symmetry (space group R3(bar)m), the enthalpy minimizing structure has lower, monoclinic, symmetry (space group Cm). The crystallographic primitive cell consists of a 12-atom icosahedron placed at the vertex of a rhombohedral lattice, together with a 3-atom chain along the 3-fold axis. In the limit of high carbon content, approaching 20% carbon, the icosahedra are usually of type B11Cp, where the p indicates the carbon resides on a polar site, while the chains are of type C-B-C. We establish an atomic interaction model for this composition limit, fit to density functional theory total energies, that allows us to investigate the substitutional disorder using Monte Carlo simulations augmented by multiple histogram analysis. We find that the low temperature monoclinic Cm structure disorders through a pair of phase transitions, first via a 3-state Potts-like transition to space group R3m, then via an Ising-like transition to the experimentally observed R3(bar)m symmetry. The R3m and Cm phases are electrically polarized, while the high temperature R3(bar)m phase is nonpolar.
Finite size dependent dispersion potentials between atoms and ions dissolved in water
Creators: name: Thiyam, P.
name: Boström, M.
name: Persson, C.
name: Parsons, D. F.
name: Brevik, I.
name: Sernelius, Bo E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A non-expanded theory is used for dispersion potentials between atoms and ions dissolved in a medium. The first-order dispersion interaction between two atoms in an excited state must account for the fact that the two atoms are coupled via the electromagnetic field and must include effects from background media, retardation and finite size. We show that finite-size corrections when two particles are close change the dispersion interactions in water by several orders of magnitude. We consider as four illustrative examples helium atoms, krypton atoms, phosphate ions, and iodide ions. We demonstrate that, due to large cancellation effects, retardation dominates the interaction for helium atom pairs in an isotropic excited state down to the very small atom-atom separations where finite-size corrections are also important
description: 5 pages, 6 figures
Roots and Webs and Nets and Branches and Bulletin Boards and Banners and Newsletters and Mutual Aid Text Threads and Kin and Caretakers and Porches and Poems of Today and Spaces of Survival
Creators: name: Branfman-Verissimo, Lukaza
Publisher: name: VCU Libraries
Year: 2022

description: VCU Theses and Dissertations
On the minimisation of cost for replica migration
Creators: name: Τziritas, Nikolaos
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΑΛΓΟΡΙΘΜΟΙ
subject: ΗΛΕΚΤΡΟΝΙΚΟΙ ΥΠΟΛΟΓΙΣΤΕΣ -- ΕΠΕΞΕΡΓΑΣΙΑ ΔΕΔΟΜΕΝΩΝ

description: Although several replica placement algorithms have becn proposed and sιudied ίη the literaturc, little research has been done so far οη capturing and minimizing the cost for migrating from an existing replica placement Ιο a new one. Ιη this work we investigate the 50 caIled RepIίca Transfer ScheduIίng Problem (RTSP) which can be briefly described as follows: Given replica placemcnts X..Id aηd Xnew , determine a sequence of object transfers and deletion5 to obtain X ηew based οη XoId with minimum transfer (network) cost. We study RTSP for the case where servers have limited storage capacity. lι can be shown that the problem is NP-complete. Therefore, we propose several heuristics and compare their performance. The proposed heuristics fall ίη three categories: (ί) algorithms derivcd from existing continuous replica placement heuristics, which take as ίηρυι an exi5ting placement and produce a new placement along with a schedule Ιο implement ίι; (ίί) algorithms that take as ίηρυι two placements and compute a schedule ιο obtain the one from ιhe other; (ίiί) algorithms for cnhancing a givcn schedule. Results indicate that heuristics of type (ίί) perfonη favorably compared Ιο the algorithms of type (ί), and that heuristics of type (ίίί) can optimize schedules generated by algorithms of type (ί) and (ίί). ΤΟ ουΓ knowledge, this is thc first time that RTSP has been sιudied as a separate problem.
title: Διαδικτυακή διαχείριση και ανάλυση ιατρικών δεδομένων μέσω κινητών συστκευών και προσωπικών υπολογιστών
titleType: AlternativeTitle
title: Web-based management and analysis of medical data through mobile devices and personal computers
Creators: name: Λορέντζος, Δημήτριος-Σωτήριος Α.
Publisher: name: University of Thessaly
Year: 2017
Subjects: subject: Πληροφοριακά συστήματα -- Ιατρική
subject: Βάσεις δεδομένων
subject: Διαδίκτυο -- Εφαρμογές

description: Σημείωση: διατίθεται συμπληρωματικό υλικό σε ξεχωριστό αρχείο.
National museums and the mobilization of history: commemorative exhibitions of Anglo-Irish conflicts in Ireland and Northern Ireland (1921-2006)
Creators: name: Cauvin, Thomas
Publisher: name: T. Cauvin, National museums and the mobilization of history: commemorative exhibitions of Anglo-Irish conflicts in Ireland and Northern Ireland (1921-2006). Florence, European University Institute, 2012
Year: 2012
Subjects: Nation
Museum
Ireland
Comparison
Memory
Identity
Reconciliation

description: Through the study of commemorative exhibitions arranged at the National Museum of Ireland (Ireland) and at the Ulster Museum (Northern Ireland), this thesis compares the changing representations of three historical conflicts (the 1690 Battle of the Boyne, the 1798 Rebellion, and the 1916 Easter Rising). Beginning with Partition and ending with new permanent military exhibitions in the twenty-first century, the research explores the ways in which the changing representations of these conflicts staged by the two museums have correlated with broader processes of mobilization of history designed to fit the needs of the present. In doing so, the complex relationships between museums and national identity are explored in the two parts of the island. The dissertation reveals how, at first, the two national museums participated in the construction of opposed official narratives, based on Nationalist and Unionist interpretations of the past in Ireland and Northern Ireland. It demonstrates how these initial interpretations of the three conflicts were gradually reassessed in response to changes in Anglo-Irish relations, especially in connection with the Northern Irish conflict and the politics of reconciliation. But the dissertation also explores how the new remit attributed to the two national museums has been shaped by the demands of cultural tourism, marketing strategy, and the new links with audiences, in a way that has served to detach the representations of the three conflicts from the political relations between the island of Ireland and Britain in the narrow sense. The dissertation explores the role of state actors, but is equally concerned with role played by …
A new time-frequency method to reveal quantum dynamics of atomic hydrogen in intense laser pulses: Synchrosqueezing Transform
Creators: name: Sheu, Yae-lin
name: Hsu, Liang-Yan
name: Wu, Hau-tieng
name: Li, Peng-Cheng
name: Chu, Shih-I
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This study introduces a new adaptive time-frequency (TF) analysis technique, synchrosqueezing transform (SST), to explore the dynamics of a laser-driven hydrogen atom at an {\it ab initio} level, upon which we have demonstrated its versatility as a new viable venue for further exploring quantum dynamics. For a signal composed of oscillatory components which can be characterized by instantaneous frequency, the SST enables rendering the decomposed signal based on the phase information inherited in the linear TF representation with mathematical support. Compared with the classical type TF methods, the SST clearly depicts several intrinsic quantum dynamical processes such as selection rules, AC Stark effects, and high harmonic generation.
Near-Infrared Circular Polarization Survey in Star-Forming Regions: Correlations and Trends
Creators: name: Kwon, Jungmi
name: Tamura, Motohide
name: Hough, James H.
name: Kusakabe, Nobuhiko
name: Nagata, Tetsuya
name: Nakajima, Yasushi
name: Lucas, Phil W.
name: Nagayama, Takahiro
name: Kandori, Ryo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have conducted a systematic near-infrared circular polarization (CP) survey in star-forming regions, covering high-mass, intermediate-mass, and low-mass young stellar objects. All the observations were made using the SIRPOL imaging polarimeter on the Infrared Survey Facility 1.4 m telescope at the South African Astronomical Observatory. We present the polarization properties of ten sub-regions in six star-forming regions. The polarization patterns, extents, and maximum degrees of linear and circular polarizations are used to determine the prevalence and origin of CP in the star-forming regions. Our results show that the CP pattern is quadrupolar in general, the CP regions are extensive, up to 0.65 pc, the CP degrees are high, up to 20 %, and the CP degrees decrease systematically from high- to low-mass young stellar objects. The results are consistent with dichroic extinction mechanisms generating the high degrees of CP in star forming regions.
description: To appear in the Astrophysical Journal Letters
Interacting galaxies in the IllustrisTNG simulations -- IV: Enhanced Supermassive Black Hole Accretion Rates in Post-Merger Galaxies
Creators: name: Byrne-Mamahit, Shoshannah
name: Hani, Maan
name: Ellison, Sara
name: Quai, Salvatore
name: Patton, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of the instantaneous supermassive black hole (SMBH) accretion rates in a collection of 1563 post-merger galaxies drawn from the IllustrisTNG simulation. Our sample consists of galaxies that have experienced a merger in the last simulation snapshot (within ~160 Myrs of coalescence) in the redshift range 01:10 and post-merger stellar masses > $10^{10} M_{\odot}$. We find that, on average, the accretion rates of the post-mergers are ~1.7 times higher than in a control sample and that post-mergers are 3-4 times more likely to experience a luminous active galactic nuclei (AGN) phase than isolated galaxies. SMBH accretion rate enhancements persist for ~2 Gyrs after coalescence, significantly exceeding the ~500 Myr lifetime of star formation rate enhancements. We find that the presence of simultaneous enhancements in both the star formation and SMBH accretion rates depends on both the mass ratio of the merger and on the gas mass of the post-merger galaxy. Despite these accretion rate enhancements, only ~35% of post-mergers experience a luminous AGN ($L_{bol}>10^{44}$ erg/s) within 500 Myrs after coalescence, and fewer than 10\% achieve a luminosity in excess of $L_{bol}>10^{45}$ erg/s. Moreover, only ~10\% of the highest luminosity ($L_{bol}>10^{45}$ erg/s) AGN in the IllustrisTNG galaxy sample are recent mergers. Our results are therefore consistent with a picture in which mergers can (but don't always) trigger AGN activity, but where the majority of galaxies hosting high luminosity AGN are not recent mergers.
description: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society
Enhancing gravitational wave astronomy with galaxy catalogues
Creators: name: Fan, Xilong
name: Messenger, Christopher
name: Heng, Ik Siong
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Joint gravitational wave (GW) and electromagnetic (EM) observations, as a key research direction in multi-messenger astronomy, will provide deep insight into the astrophysics of a vast range of astronomical phenomena. Uncertainties in the source sky location estimate from gravitational wave observations mean follow-up observatories must scan large portions of the sky for a potential companion signal. A general frame of joint GW-EM observations is presented by a multi-messenger observational triangle. Using a Bayesian approach to multi-messenger astronomy, we investigate the use of galaxy catalogue and host galaxy information to reduce the sky region over which follow-up observatories must scan, as well as study its use for improving the inclination angle estimates for coalescing binary compact objects. We demonstrate our method using a simulated neutron stars inspiral signal injected into simulated Advanced detectors noise and estimate the injected signal sky location and inclination angle using the Gravitational Wave Galaxy Catalogue. In this case study, the top three candidates in rank have $72\%$, $15\%$ and $8\%$ posterior probability of being the host galaxy, receptively. The standard deviation of cosine inclination angle (0.001) of the neutron stars binary using gravitational wave-galaxy information is much smaller than that (0.02) using only gravitational wave posterior samples.
description: Proceedings of the Sant Cugat Forum on Astrophysics. 2014 Session on 'Gravitational Wave Astrophysics'
Organising and Archiving Interview Data
Creators: name: Admiraal, Femmy
Publisher: name: Zenodo
Year: 2023

description: Collecting interview data, often audio and/or video recordings, is a widely used method to generate or validate scientific claims. The issues that researchers deal with when handling interview data are related to this particular data type and are often domain agnostic. This session focusses on practical tips for collecting interview data, as well as for documenting the raw data and keep an overview of the various steps in the workflow while processing the data (e.g. transcription, anonymization). Finally, we will look into the possibilities of archiving interview data while taking into account any appropriate restrictions.
On the superconductivity of the Li$_{x}$RhB$_{y}$ compositions
Creators: name: Takeya, H.
name: ElMassalami, M.
name: Amorim, H. S.
name: Fujii, H.
name: Mochiku, T.
name: Takano, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We observed superconductivity ($T_{c}$ $\simeq$2-3 K) in Li$_{x}$RhB$_{y}$ intermetallics wherein $x$ and $y$ vary over a wide compositional range. The crystal structure consists of cubic unit-cell ($a$ $\simeq$ 12.1 Å) with centro-symmetric space group $Pn\bar{3}n$. A weak but positive pressure-induced increase of $T_{c}$ was observed. The correlations between the composition and each of the followings were followed over a wide range of $x$ and $y$: the unit-cell dimensions, $T_{c}$ , Sommerfeld coefficient $γ$, Debye temperature $θ_{D}$, and critical fields $H$$_{c1}$ and $H$$_{c2}$. The thermal evolution of the electronic specific heat within the superconducting phase was observed to follow a quadratic-in-$T$ behavior. In addition, a paramagnetic Meissner Effect (PME) is manifested during a low-field-cooled magnetization cycle. This manifestation of quadratic-in-$T$ behavior and PME feature will be discussed.
description: 6 pages, 8 figures, to appear in Materials Research Express (2014)
New Short-Period Delta Scuti Stars in OGLE-IV Fields toward the Galactic Bulge
Creators: name: Pietrukowicz, P.
name: Ratajczak, M.
name: Soszynski, I.
name: Udalski, A.
name: Szymanski, M. K.
name: Ulaczyk, K.
name: Poleski, R.
name: Kozlowski, S.
name: Skowron, J.
name: Skowron, D. M.
name: Mroz, P.
name: Rybicki, K.
name: Iwanek, P.
name: Wrona, M.
name: Gromadzki, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the classification of 24 puzzling short-period variable stars located in OGLE-IV Galactic bulge fields. The stars are low-amplitude (<0.05 mag) multi-periodic objects with dominant periods between 22 and 54 min whose type could not have been unambiguously established based on photometry only. A low-resolution spectroscopic follow-up has shown that all the objects are main sequence A/F-type stars. Thus, all the variables are delta Sct-type pulsators. We have added them to the OGLE-IV Collection of Variable Stars.
description: The OGLE data are available at https://www.astrouw.edu.pl/ogle/
title: Σχεδιασμός και υλοποίηση επεκτάσιμης αρχιτεκτονικής για την ευέλικτη και αποδοτική πρόσβαση σε απομακρυσμένους RFID αναγνώστες
titleType: AlternativeTitle
Creators: name: Κουτσουμπέλιας, Μάνος
Publisher: name: University of Thessaly
Year: 2008
Subjects: subject: ΗΛΕΚΤΡΟΝΙΚΟΙ ΥΠΟΛΟΓΙΣΤΕΣ -- ΔΙΚΤΥΑ
subject: ΗΛΕΚΤΡΟΝΙΚΗ ΕΠΕΞΕΡΓΑΣΙΑ ΔΕΔΟΜΕΝΩΝ

description: Παρατηρήσεις έκδοσης: χαμηλής ποιότητας εκτύπωση.
description: Η παρούσα εργασία περιγράφει μία αρχιτεκτονική για την παροχή απομακρυσμένης πρόσβασης σε σταθερές και μετακινούμενες αποθήκες οι οποίες είναι εφοδιασμένες με απλούς RFID αναγνώστες. Το κύριο αντικείμενο του συστήματος είναι να παρέχει με ευέλικτο και αποδοτικό τρόπο την πρόσβαση σε χαμηλού κόστους αναγνώστες, οι οποίοι είναι υλοποιημένοι σε ενσωματωμένα συστήματα, στις υπηρεσίες ενδιάμεσου λογισμικού των εφαρμογών. Το σύστημα είναι υλοποιημένο στο λειτουργικό σύστημα Linux και επικοινωνεί με πρότυπους RFID αναγνώστες διαμέσου αργών ασύρματων συνδέσεων.
An Investigation of Reconfigurable Magnetomechanical Metamaterials
Creators: name: Galea, R.
name: Farrugia, P. -S.
name: Dudek, K. K.
name: Mangion, L. Zammit
name: Grima, J. N.
name: Gatt, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In this work, an experimental investigation of an accordion-like system with embedded magnetic inclusion is carried out. It is shown that the way that this structure deforms when subjected to an external magnetic field depends on the magnetic moment of the embedded magnets and the length of the arms. Stacking of the accordion-like system leads to the formation of hexagonal honeycombs that can have a negative, zero, and positive Poisson's ratio. Variation in the configuration attained depends on the relative positioning of the magnetic inclusion and the applied magnetic field. In particular, one of the hexagonal honeycomb arrangements was able to switch between a conventional and a re-entrant configuration upon the reversal of the external magnetic field. For all structures considered, the dimensions can be controlled through the external magnetic field allowing for a high degree of turnability. Furthermore, their behaviour can be altered in real time. The practical implications of the results are of interest since they indicate that these structures can be adopted in numerous applications, such in the design of scaffoldings for deployable structures, actuators, variable pored sieves, and sound proofing systems.
description: This paper was published in the journal Physica Status Solidi B, DOI: https://doi.org/10.1002/pssb.202200420
Forschungsdaten und Forschungsdatenmanagement: Beratung, Schulungen, Dienste an der Freien Universität Berlin
Creators: name: Fütterer, Heinz-Alexander
name: Söring, Sibylle
name: Asef, Esther
Publisher: name: Zenodo
Year: 2022
Subjects: Forschungsdaten
Forschungsdatenmanagement
Services
Freie Universität Berlin

description: Auf dem Poster werden die angebotenen Dienste der Freien Universität Berlin (FU Berlin) zum Thema Forschungsdatenmanagement dargestellt. Sie sind nach den verantwortlichen Einrichtungen gegliedert: Universitätsbibliothek, Rechenzentrum (ZEDAT) und Fachbereiche.
Viscoelastic modulus reconstruction using time harmonic vibrations
Creators: name: Ammari, Habib
name: Seo, Jin Keun
name: Zhou, Liangdong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This paper presents a new iterative reconstruction method to provide high-resolution images of shear modulus and viscosity via the internal measurement of displacement fields in tissues. To solve the inverse problem, we compute the Fréchet derivatives of the least-squares discrepancy functional with respect to the shear modulus and shear viscosity. The proposed iterative reconstruction method using this Fréchet derivative does not require any differentiation of the displacement data for the full isotropic linearly viscoelastic model, whereas the standard reconstruction methods require at least double differentiation. Because the minimization problem is ill-posed and highly nonlinear, this adjoint-based optimization method needs a very well-matched initial guess. We find a good initial guess. For a well-matched initial guess, numerical experiments show that the proposed method considerably improves the quality of the reconstructed viscoelastic images.
description: 15 pages
Modeling polar order in compressively strained SrTiO$_{3}$
Creators: name: Hallett, Alex
name: Harter, John W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Strontium titanate is an incipient ferroelectric in which superconductivity emerges at exceptionally low doping levels. Remarkably, stabilizing the polar phase through strain or chemical substitution has been shown to significantly enhance the superconducting critical temperature, and the polar instability plays a pivotal role in the majority of proposed superconducting pairing mechanisms. A rigorous understanding of ferroelectricity is therefore essential to elucidate the electron pairing mechanism in this material. To investigate the nature of the polar order in strontium titanate, we develop a simplified free energy model that only includes the degrees of freedom necessary to capture the relevant physics in a biaxially compressively strained system. Our model is able to calculate the energies of large, disordered systems with near DFT-level accuracy. We simulate the ferroelectric and antiferrodistortive phase transitions using the Monte Carlo method and discuss the coupling between various order parameters. Finally, we assess the character of the polar transition, which we find to be neither strictly displacive nor order-disorder.
Structurally Robust Control of Complex Networks
Creators: name: Nacher, Jose C.
name: Akutsu, Tatsuya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Robust control theory has been successfully applied to numerous real-world problems using a small set of devices called {\it controllers}. However, the real systems represented by networks contain unreliable components and modern robust control engineering has not addressed the problem of structural changes on a large network. Here, we introduce the concept of structurally robust control of complex networks and provide a concrete example using an algorithmic framework that is widely applied in engineering. The developed analytical tools, computer simulations and real network analyses lead herein to the discovery that robust control can be achieved in scale-free networks with exactly the same order of controllers required in a standard non-robust configuration by adjusting only the minimum degree. The presented methodology also addresses the probabilistic failure of links in real systems, such as neural synaptic unreliability in {\it C. elegans}, and suggests a new direction to pursue in studies of complex networks in which control theory has a role.
description: 36 pages, 22 figures. This paper was submitted to a journal in May 2014 and still under review. Please cite the arxiv version if your work is related to our research
Three-dimensional atom localization by laser fields in a four-level tripod system
Creators: name: Ivanov, Vladimir S.
name: Rozhdestvensky, Yuri V.
name: Suominen, Kalle-Antti
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a scheme of the high-precise three-dimensional (3D) localization by the measurement of the atomic-level population. The scheme is applied to a four-level tripod-type atom coupled by three strong standing waves and a probe running wave. As a result, the atom can be localized in volumes that are substantially smaller than a cubic optical wavelength. The upper-level distribution depends crucially on the atom-field coupling and it forms 3D periodic structures composed of spheres, hourglasses, bowls, donuts, or deformed barrels.
description: 5 pages, 3 figures
A new Cambrian frondose organism: ‘Ediacaran survivor’ or convergent evolution?
Creators: name: Hu, Shixue
name: Zhao, Fangchen
name: Liu, Alexander G.
name: Zhu, Maoyan
Publisher: name: Geological Society of London
Year: 2022
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Supplementary Figures S1–S9
Quantum Methods for Neural Networks and Application to Medical Image Classification
Creators: name: Landman, Jonas
name: Mathur, Natansh
name: Li, Yun Yvonna
name: Strahm, Martin
name: Kazdaghli, Skander
name: Prakash, Anupam
name: Kerenidis, Iordanis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum machine learning techniques have been proposed as a way to potentially enhance performance in machine learning applications. In this paper, we introduce two new quantum methods for neural networks. The first one is a quantum orthogonal neural network, which is based on a quantum pyramidal circuit as the building block for implementing orthogonal matrix multiplication. We provide an efficient way for training such orthogonal neural networks; novel algorithms are detailed for both classical and quantum hardware, where both are proven to scale asymptotically better than previously known training algorithms. The second method is quantum-assisted neural networks, where a quantum computer is used to perform inner product estimation for inference and training of classical neural networks. We then present extensive experiments applied to medical image classification tasks using current state of the art quantum hardware, where we compare different quantum methods with classical ones, on both real quantum hardware and simulators. Our results show that quantum and classical neural networks generates similar level of accuracy, supporting the promise that quantum methods can be useful in solving visual tasks, given the advent of better quantum hardware.
description: arXiv admin note: substantial text overlap with arXiv:2109.01831, arXiv:2106.07198
Current status of the Spectrograph System for the SuMIRe/PFS
Creators: name: Vives, S.
name: Mignant, D. Le
name: Gunn, J. E.
name: Smee, S.
name: de Oliveira, L. Souza
name: Tamura, N.
name: Sugai, H.
name: Barkhouser, R.
name: Bozier, A.
name: Carr, M. A.
name: de Oliveira, A. Cesar
name: Ferrand, D.
name: Golebiowski, M.
name: Hart, M.
name: Hope, S.
name: Jaquet, M.
name: Madec, F.
name: Pascal, S.
name: Pegot-Ogier, T.
name: de Arruda, M. Vittal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Prime Focus Spectrograph (PFS) is a new facility instrument for Subaru Telescope which will be installed in around 2017. It is a multi-object spectrograph fed by about 2400 fibers placed at the prime focus covering a hexagonal field-of-view with 1.35 deg diagonals and capable of simultaneously obtaining data of spectra with wavelengths ranging from 0.38 um to 1.26 um. The spectrograph system is composed of four identical modules each receiving the light from 600 fibers. Each module incorporates three channels covering the wavelength ranges 0.38-0.65 mu ("Blue"), 0.63-0.97 mu ("Red"), and 0.94-1.26 mu ("NIR") respectively; with resolving power which progresses fairly smoothly from about 2000 in the blue to about 4000 in the infrared. An additional spectral mode allows reaching a spectral resolution of 5000 at 0.8mu (red). The proposed optical design is based on a Schmidt collimator facing three Schmidt cameras (one per spectral channel). This architecture is very robust, well known and documented. It allows for high image quality with only few simple elements (high throughput) at the expense of the central obscuration, which leads to larger optics. Each module has to be modular in its design to allow for integration and tests and for its safe transport up to the telescope: this is the main driver for the mechanical design. In particular, each module will be firstly fully integrated and validated at LAM (France) before it is shipped to Hawaii. All sub-assemblies will be indexed on the bench to allow for their accurate repositioning. This paper will give an overview of the spectrograph system which has successfully passed the Critical Design Review (CDR) in 2014 March and which is now in the construction phase.
description: 9 pages, 7 figures, submitted to "Ground-based and Airborne Instrumentation for Astronomy V, Suzanne K. Ramsay, Ian S. McLean, Hideki Takami, Editors, Proc. SPIE 9147 (2014)"
The ultraluminous X-ray source M81 X-6: a weakly magnetised neutron star with a precessing accretion disc?
Creators: name: Amato, Roberta
name: Gúrpide, Andres
name: Webb, Natalie A.
name: Godet, Olivier
name: Middleton, Matthew J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the nature of the ULX M81 X-6, which has been suggested to harbour a neutron star (NS), by studying its long-term X-ray spectral and temporal evolution, using the rich set of available archival data from XMM-Newton, Chandra, NuSTAR, and Swift/XRT. We tracked the evolution of the source on the hardness-intensity diagram and find that the source oscillates between two main states: one characterised by a hard and luminous spectrum and the other at low hardness and luminosity. The properties of the soft component remain constant between the two states, suggesting that changes in the mass-transfer rate are not driving the spectral transitions. Instead, the bi-modal behaviour of the source and the known super-orbital period would point to the precession of the accretion disc. Here, we tested two theoretical models: (1) Lense-Thirring precession, which can explain the super-orbital period if the NS has a magnetic field $B$ $\lesssim10^{10}$ G, supporting the idea of M81 X-6 as a weakly magnetised NS, and (2) precession due to the torque of the NS magnetic field, which leads to $B \gtrsim$ 10$^{11}$ G. However, the latter scenario, assuming M81 X-6 shares similar properties with other NS-ULXs, is disfavoured because it would require magnetic field strengths ($B>10^{15}$ G) much higher than those known for other pulsating ULXs. We further show that the contribution from the hard component attributed to the putative accretion column sits just below the typical values found in pulsating ULXs, which, together with the low value of the pulsed fraction ($\leq10$\%) found for one XMM-Newton/pn observation, could explain the source's lack of pulsations. The spectral properties and variability of M81 X-6 can be accounted for if the accretor is a NS with a low magnetic field. Under the hypothesis of Lense-Thirring precession, we predict a spin period of the NS of a few seconds.
description: 14 pages, 10 figures. Accepted for publication on Astronomy & Astrophysics
The role of electronic cross-cultural competence among students in an international university environment
Creators: name: Miller Leon
name: Tuisk Tarmo
name: Nekrassova Natalja
Publisher: name: Социология науки и технологий
Year: 2016
Subjects: CROSS-CULTURAL COMMUNICATION
CROSS-CULTURAL COMPETENCES
ELECTRONIC CROSS-COMMUNICATION
LOW-CONTEXT AND HIGH-CONTEXT
HIGHER EDUCATION

description: The continuously increasing impact of electronic communication is creating a corresponding increase in the need for people to develop specific electronic communication skills and competence. This is especially true when it comes to the role of electronic interactions in institutions of higher education; the role of electronic communications in facilitating and accommodating an intensification of multifaceted systems of interactions in institutions of higher education, and the need to effectively manage the increased diversity challenge that has resulted from the internationalization of higher education. This article argues that although there has been much research on the role of intercultural communications and increased competence in preparing students of institutions of higher education to manage the diversity challenges of the 21st century there is little or no research on factors that play a role in electronic communications competence. This article fills that gap by undertaking a comprehensive analysis of the role that ICT plays in student adjustment in cross-cultural learning environments. According to Edward Hall cultures can be classified as of low or high context. The current study aims to investigate how one’s cultural background can influence his/her effectiveness and interest in electronic communication. A study of 107 students majoring in business administration and international relations was carried out in an international university at the beginning of 2016. The results of the study show that there exists a strong variation among students with different cultural backgrounds in respect of their cross-cultural communication competences. Representatives of high context culture are more likely to rely on electronic communication systems to help them with their adaptation and in facilitating interactions in their new cross-cultural environment when compared to low-context respondents.
Controllable synthesis of single-, double- and triple-walled carbon nanotubes from asphalt
Creators: name: Xu, Kai
name: Li, Yongfeng
name: Xu, Chunming
name: Gao, Jinsen
name: Liu, Hongwen
name: Yang, Haitao
name: Richard, Pierre
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Single-, double- and triple-walled carbon nanotubes (SWNTs, DWNTs and TWNTs) have been controlla- bly synthesized by an arc discharge method using asphalt as carbon source. The morphology and struc- ture of three kinds of products synthesized with Fe as catalyst were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy and energy dispersive X-ray spectroscopy (EDX). It was found that different buffer gases strongly affect the number layers in the synthesized nanotubes. In the He gas atmosphere only SWNTs were found to be synthesized by arc discharge in contrast to the case in Ar gas atmosphere in which only TWNTs were formed. In N2 atmosphere both SWNTs and DWNTs were synthesized. Our findings indicate that asphalt is a suitable industrial carbon source for the growth of different type nanotubes.
description: 18 pages, 4 figures. This is the authors' version. The published, high resolution version of this paper, Copyright (2013) by Elseiver, can be found at http://www.journals.elsevier.com/chemical-engineering-journal/
ДИНАМИКА ПОКАЗАТЕЛЕЙ СОСУДИСТО-ТРОМБОЦИТАРНОГО И КОАГУЛЯЦИОННОГО ЗВЕНЬЕВ СИСТЕМЫ ГЕМОСТАЗА У ПАЦИЕНТОВ САХАРНЫМ ДИАБЕТОМ
Creators: name: Дадабаева, Мухлисахон
name: Муминова, Ситора
name: Фарахиддинова, Махлие
Publisher: name: Zenodo
Year: 2023

description: В настоящее время, многочисленными исследованиями указано, что многообразные биохимические и структурные изменения происходящих в различных системах организма   при сахарном диабете является следствием осложнений данной патологии. При этом, главным патогенетическим механизмом развития микроангиопатий при сахарном диабете является гликозилирование сосудистой стенки. С позиций теории глюкозотоксичности одним из патогенетических механизмов развития гиперкоагуляционного синдрома при повышении уровня гликозилированного гемоглобина у больных СД является усиление активности процессов неэнзиматического гликирования белков, ведущее к изменению функциональной активности компонентов сосудистой стенки.
Models of the circumstellar medium of evolving, massive runaway stars moving through the Galactic plane
Creators: name: Meyer, D. M. -A.
name: Mackey, J.
name: Langer, N.
name: Gvaramadze, V. V.
name: Mignone, A.
name: Izzard, R. G.
name: Kaper, L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: At least 5 per cent of the massive stars are moving supersonically through the interstellar medium (ISM) and are expected to produce a stellar wind bow shock. We explore how the mass loss and space velocity of massive runaway stars affect the morphology of their bow shocks. We run two-dimensional axisymmetric hydrodynamical simulations following the evolution of the circumstellar medium of these stars in the Galactic plane from the main sequence to the red supergiant phase. We find that thermal conduction is an important process governing the shape, size and structure of the bow shocks around hot stars, and that they have an optical luminosity mainly produced by forbidden lines, e.g. [OIII]. The Ha emission of the bow shocks around hot stars originates from near their contact discontinuity. The H$α$ emission of bow shocks around cool stars originates from their forward shock, and is too faint to be observed for the bow shocks that we simulate. The emission of optically-thin radiation mainly comes from the shocked ISM material. All bow shock models are brighter in the infrared, i.e. the infrared is the most appropriate waveband to search for bow shocks. Our study suggests that the infrared emission comes from near the contact discontinuity for bow shocks of hot stars and from the inner region of shocked wind for bow shocks around cool stars. We predict that, in the Galactic plane, the brightest, i.e. the most easily detectable bow shocks are produced by high-mass stars moving with small space velocities.
description: 22 pages, 24 figures
Cross-Domain Transfer via Semantic Skill Imitation
Creators: name: Pertsch, Karl
name: Desai, Ruta
name: Kumar, Vikash
name: Meier, Franziska
name: Lim, Joseph J.
name: Batra, Dhruv
name: Rai, Akshara
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We propose an approach for semantic imitation, which uses demonstrations from a source domain, e.g. human videos, to accelerate reinforcement learning (RL) in a different target domain, e.g. a robotic manipulator in a simulated kitchen. Instead of imitating low-level actions like joint velocities, our approach imitates the sequence of demonstrated semantic skills like "opening the microwave" or "turning on the stove". This allows us to transfer demonstrations across environments (e.g. real-world to simulated kitchen) and agent embodiments (e.g. bimanual human demonstration to robotic arm). We evaluate on three challenging cross-domain learning problems and match the performance of demonstration-accelerated RL approaches that require in-domain demonstrations. In a simulated kitchen environment, our approach learns long-horizon robot manipulation tasks, using less than 3 minutes of human video demonstrations from a real-world kitchen. This enables scaling robot learning via the reuse of demonstrations, e.g. collected as human videos, for learning in any number of target domains.
description: Project website: https://kpertsch.github.io/star
title: Χρηματοοικονομική ανάλυση και αξιολόγηση δημόσιου έργου με σύμβαση παραχώρησης
titleType: AlternativeTitle
Creators: name: Ιωάννου, Αθανάσιος Δ.
Publisher: name: University of Thessaly
Year: 2018
Subjects: subject: Δημόσια έργα -- Ανάθεση
subject: Δημόσια έργα -- Διαχείριση
subject: Έργα υποδομής -- Χρηματοδότηση

description: Σημείωση: διατίθεται συμπληρωματικό υλικό σε ξεχωριστό αρχείο.