cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Natural orbitals representation and Fermi sea depletion in finite nuclei and nuclear matter
Creators: name: Psonis, V. P.
name: Moustakidis, Ch. C.
name: Massen, S. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The natural orbitals and natural occupation numbers of various N = Z, sp and sd shell nuclei are calculated by applying a correlated one-body density matrix. The correlated density matrix has been evaluated by considering central correlations of Jastrow type and an approximation named factor cluster expansion. The correlation effects on the natural orbitals, natural occupation numbers and the Fermi sea depletion are discussed and analysed. In addition, an approximate expression for the correlated one-body density matrix of the nuclear matter has been used for the evaluation of the relative momentum distribution and the Fermi sea depletion. We found that the value of the Fermi sea depletion is higher in closed shell nuclei compared to open shell ones and it is lower compared to the case of nuclear matter. This statement could be confirmed by relevant experimental studies.
description: 20 pages, 3 figures, 2 tables
Forensic Analysis of Phone Call Networks
Creators: name: Catanese, Salvatore
name: Ferrara, Emilio
name: Fiumara, Giacomo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In the context of preventing and fighting crime, the analysis of mobile phone traffic, among actors of a criminal network, is helpful in order to reconstruct illegal activities on the base of the relationships connecting those specific individuals. Thus, forensic analysts and investigators require new advanced tools and techniques which allow them to manage these data in a meaningful and efficient way. In this paper we present LogAnalysis, a tool we developed to provide visual data representation and filtering, statistical analysis features and the possibility of a temporal analysis of mobile phone activities. Its adoption may help in unveiling the structure of a criminal network and the roles and dynamics of communications among its components. By using LogAnalysis, forensic investigators could deeply understand hierarchies within criminal organizations, for example discovering central members that provide connections among different sub-groups, etc. Moreover, by analyzing the temporal evolution of the contacts among individuals, or by focusing on specific time windows they could acquire additional insights on the data they are analyzing. Finally, we put into evidence how the adoption of LogAnalysis may be crucial to solve real cases, providing as example a number of case studies inspired by real forensic investigations led by one of the authors.
description: 18 pages, 10 figures
Do Rainbow Trout and Their Hybrids Outcompete Cutthroat Trout in a Lentic Ecosystem?
Creators: name: Courtney, Joshua M.
name: Courtney, Amy C.
name: Courtney, Michael W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Much has been written about introduced rainbow trout interbreeding and outcompeting native cutthroat trout. However, specific mechanisms have not been thoroughly explored, and most data is limited to lotic ecosystems. Samples of Snake River cutthroat trout (Oncorhynchus clarkii bouvieri), the rainbow-cutthroat hybrid, the cutbow trout (Onchorhynchus mykiss x clarkii), and rainbow trout (Oncorhynchus mykiss), were obtained from a lentic ecosystem (Eleven Mile Reservoir, Colorado) by creel surveys conducted from May to October, 2012. The total length and weight of each fish was measured and the relative condition factor of each fish was computed using expected weight from weight-length relationships from the Colorado Division of Parks and Wildlife (CDPW). Data from the CDPW collected from 2003-2010 in the same lentic ecosystem were used to compute relative condition factors for additional comparison, as was independent creel survey data from 2011. Cutthroat trout were plump: the mean relative condition factor of the cutthroat trout was 112.0% (+/- 1.0%). Cutbow hybrid trout were close to the expected weights with a mean relative condition factor of 99.8% (+/- 0.6%). Rainbow trout were thinner with a mean relative condition factor of 96.4% (+/- 1.4%). Comparing mean relative condition factors of CDPW data from earlier years and plotting the 2012 data relative to percentile curves also shows the same trend of cutthroat trout being plumper than expected and rainbow trout being thinner than the cutthroat trout, with the hybrid cutbow trout in between. This data supports the hypothesis that rainbow trout do not outcompete cutthroat trout in lentic ecosystems. Comparison with data from three other Colorado reservoirs also shows that cutthroat trout tend to be more plump than rainbow trout and their hybrids in sympatric lentic ecosystems.
A classification of symmetry enriched topological phases with exactly solvable models
Creators: name: Mesaros, Andrej
name: Ran, Ying
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Recently a new class of quantum phases of matter: symmetry protected topological states, such as topological insulators, attracted much attention. In presence of interactions, group cohomology provides a classification of these [X. Chen et al., arXiv:1106.4772v5 (2011)]. These phases have short-ranged entanglement, and no topological order in the bulk. However, when long-range entangled topological order is present, it is much less understood how to classify quantum phases of matter in presence of global symmetries. Here we present a classification of bosonic gapped quantum phases with or without long-range entanglement, in the presence or absence of on-site global symmetries. In 2+1 dimensions, the quantum phases in the presence of a global symmetry group SG, and with topological order described by a finite gauge group GG, are classified by the cohomology group H^3(SGxGG,U(1)). Generally in d+1 dimensions, such quantum phases are classified by H^{d+1}(SGxGG,U(1)). Although we only partially understand to what extent our classification is complete, we present an exactly solvable local bosonic model, in which the topological order is emergent, for each given class in our classification. When the global symmetry is absent, the topological order in our models is described by the general Dijkgraaf-Witten discrete gauge theories. When the topological order is absent, our models become the exactly solvable models for symmetry protected topological phases [X. Chen et al., arXiv:1106.4772v5 (2011)]. When both the global symmetry and the topological order are present, our models describe symmetry enriched topological phases. Our classification includes, but goes beyond the previously discussed projective symmetry group classification. Measurable signatures of these symmetry enriched topological phases, and generalizations of our classification are discussed.
description: 56 pages, 22 figures
Publikationen und Gender-Effekte in der Mathematik
Creators: name: Mihaljević, Helena
name: Santamaria, Lucía
name: Tullney, Marco
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Gender
subject: Scholarly Communications
subject: Mathematics
subject: FOS: Mathematics
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Die Unterrepräsentation von Frauen in der wissenschaftlichen Mathematik hält trotz steigender Absolventinnenzahlen an. Publikationen sind ein wesentlicher Baustein wissenschaftlicher Karrieren. Deshalb werden sie in unserer Arbeit analysiert. Es werden zentraler Ergebnisse eines Forschungsartikels (https://doi.org/10.1371/journal.pone.0165367) vorgestellt, weitere Forschung angekündigt und schließlich zu einer Diskussion eingeladen. Die Ergebnisse zeigen deutliche Unterschiede beim Publikationsverhalten zwischen Frauen und Männern mit Karrierenachteilen für Frauen. Die Geschlechterzuschreibung erfolgte algorithmisch auf Basis von Einträgen in zbMATH.
Elaboration of the alpha-Model Derived from the BCS Theory of Superconductivity
Creators: name: Johnston, D. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The single-band alpha-model of superconductivity [H. Padamsee, et al., J. Low Temp. Phys. {\bf 12}, 387 (1973)] is a popular model that was adapted from the single-band Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity mainly to allow fits to electronic heat capacity versus temperature T data that deviate from the BCS prediction. The model assumes that the normalized superconducting order parameter Delta(T)/Delta(0) and therefore the normalized London penetration depth lambda_L(T)/lambda_L(0) are the same as in BCS theory, calculated using the BCS value alpha_BCS = 1.764 of alpha = Delta(0)/(kB Tc), where kB is Boltzmann's constant and Tc is the superconducting transition temperature. On the other hand, to calculate the electronic free energy, entropy, heat capacity and thermodynamic critical field versus T, the alpha-model takes alpha to be an adjustable parameter. Here we write the BCS equations and limiting behaviors for the superconducting state thermodynamic properties explicitly in terms of alpha, as needed for calculations within the alpha-model, and present plots of the results versus T and alpha that are compared with the respective BCS predictions. Mechanisms such as gap anisotropy and strong coupling that can cause deviations of the thermodynamics from the BCS predictions, especially the heat capacity jump at Tc, are considered. Extensions of the alpha-model that have appeared in the literature such as the two-band model are also discussed. Tables of values of Delta(T)/Delta(0) and lambda_L(T)/lambda_L(0) calculated from the BCS theory using alpha = alpha_BCS are provided, which are the same in the alpha-model by assumption. Tables of values of the entropy, heat capacity and thermodynamic critical field versus T for seven values of alpha including alpha_BCS are also presented.
description: 19 two-column pages, 9 figures, 7 tables
MPEC 2023-V235 : 2023 VH8
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 VH8

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Identification of intermittent multi-fractal turbulence in fully kinetic simulations of magnetic reconnection
Creators: name: Leonardis, E.
name: Chapman, S. C.
name: Daughton, W.
name: Roytershteyn, V.
name: Karimabadi, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Recent fully nonlinear, kinetic three-dimensional simulations of magnetic reconnection [Daughton et al. 2011] evolve structures and exhibit dynamics on multiple scales, in a manner reminiscent of turbulence. These simulations of reconnection are among the first to be performed at sufficient spatio-temporal resolution to allow formal quantitative analysis of statistical scaling which we present here. We find that the magnetic field fluctuations generated by reconnection are anisotropic, have non-trivial spatial correlation and exhibit the hallmarks of finite range fluid turbulence; they have non-Gaussian distributions, exhibit Extended Self-Similarity in their scaling and are spatially multifractal. Furthermore, we find that the field J.E is also multifractal, so that magnetic energy is converted to plasma kinetic energy in a manner that is spatially intermittent. This suggests that dissipation in this sense in collisionless reconnection on kinetic scales has an analogue in fluid-like turbulent phenomenology, in that it proceeds via multifractal structures generated by an intermittent cascade.
VIVO 2018 - ein Rückblick
Creators: name: Hauschke, Christian
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: VIVO
subject: Forschungsinformationssystem
subject: CRIS
subject: FIS
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: In diesem Vortrag werden Entwicklungen in der deutschen und internationalen VIVO-Community seit dem letzten Workshop zusammengefasst, inklusive eines Rückblicks auf die VIVO Conference 2018.
Electric Time in Quantum Cosmology
Creators: name: Alexander, Stephon
name: Bojowald, Martin
name: Marciano, Antonino
name: Simpson, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Effective quantum cosmology is formulated with a realistic global internal time given by the electric vector potential. New possibilities for the quantum behavior of space-time are found, and the high-density regime is shown to be very sensitive to the specific form of state realized.
description: 19 pages, 5 figures
In vivo analysis of vascularization and biocompatibility of electrospun polycaprolactone fibre mats in the rat femur chamber
Creators: name: Gniesmer, Sarah
name: Brehm, Ralph
name: Hoffmann, Andrea
name: De Cassan, Dominik
name: Menzel, Henning
name: Hoheisel, Anna-Lena
name: Glasmacher, Birgit
name: Willbold, Elmar
name: Reifenrath, Janin
name: Wellmann, Mathias
name: Ludwig, Nils
name: Tavassol, Frank
name: Zimmerer, Rüdiger
name: Gellrich, Nils-Claudius
name: Kampmann, Andreas
Publisher: name: Chichester : John Wiley and Sons Ltd
Year: 2019
Subjects: subject: angiogenesis
subject: biocompatibility
subject: electrospinning
subject: intravital microscopy
subject: microhaemodynamics
subject: PCL fibre mats
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: In orthopaedic medicine, connective tissues are often affected by traumatic or degenerative injuries, and surgical intervention is required. Rotator cuff tears are a common cause of shoulder pain and disability among adults. The development of graft materials for bridging the gap between tendon and bone after chronic rotator cuff tears is essentially required. The limiting factor for the clinical success of a tissue engineering construct is a fast and complete vascularization of the construct. Otherwise, immigrating cells are not able to survive for a longer period of time, resulting in the failure of the graft material. The femur chamber allows the observation of microhaemodynamic parameters inside implants located in close vicinity to the femur in repeated measurements in vivo. We compared a porous polymer patch (a commercially available porous polyurethane-based scaffold from Biomerix™) with electrospun polycaprolactone (PCL) fibre mats and chitosan (CS)-graft-PCL modified electrospun PCL (CS-g-PCL) fibre mats in vivo. By means of intravital fluorescence microscopy, microhaemodynamic parameters were analysed repetitively over 20 days at intervals of 3 to 4 days. CS-g-PCL modified fibre mats showed a significantly increased vascularization at Day 10 compared with Day 6 and at Day 14 compared with the porous polymer patch and the unmodified PCL fibre mats at the same day. These results could be verified by histology. In conclusion, a clear improvement in terms of vascularization and biocompatibility is achieved by graft-copolymer modification compared with the unmodified material. © 2019 The Authors Journal of Tissue Engineering and Regenerative Medicine Published by John Wiley & Sons Ltd
Higgs Spin Determination in the WW channel and beyond
Creators: name: Frank, Jessica
name: Rauch, Michael
name: Zeppenfeld, Dieter
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: After the discovery of the 126 GeV resonance at the LHC, the determination of its features, including its spin, is a very important ongoing task. In order to distinguish the two most likely spin hypotheses, spin-0 or spin-2, we study the phenomenology of a light Higgs-like spin-2 resonance produced in different gluon-fusion and vector-boson-fusion processes at the LHC. Starting from an effective model for the interaction of a spin-2 particle with the SM gauge bosons, we calculate cross sections and differential distributions within the Monte Carlo program Vbfnlo. We find that with specific model parameters such a spin-2 resonance can mimic SM Higgs rates and transverse-momentum distributions in $γγ$, $WW$ and $ZZ$ decays, whereas several distributions allow to separate spin-2 from spin-0, independently of the spin-2 model parameters.
description: 14 pages, 7 figures
ORCID Deutschland Konsortium: Stand und Perspektive
Creators: name: Dreyer, Britta
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: ORCID
subject: Open Researcher and Contributor ID
subject: ORCID DE
subject: Autorenidentifikation
subject: Konsortium
subject: Deutschland
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Der Vortrag beschreibt den Stand und die Perspektive des ORCID Deutschland Konsortiums.
ORCID Germany Consortium - Numbers and Figures
Creators: name: Vierkant, Paul
name: Pampel, Heinz
name: Bertelmann, Roland
name: Dreyer, Britta
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Consortium
subject: ORCID
subject: Open Researcher and Contributor ID
subject: ORCID DE
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: This poster shows the development and status of the ORCID Germany Consortium.
Surface composition and dynamical evolution of two retrograde objects in the outer solar system: 2008 YB3 and 2005 VD
Creators: name: Pinilla-Alonso, N.
name: Alvarez-Candal, A.
name: Melita, M. D.
name: Lorenzi, V.
name: Licandro, J.
name: Carvano, J.
name: Lazzaro, D.
name: Carraro, G.
name: Ali-Lagoa, V.
name: Costa, E.
name: Hasselmann, P. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Most of the objects in the trans-Neptunian belt (TNb) and related populations move in prograde orbits with low eccentricity and inclination. However, the list of icy minor bodies moving in orbits with an inclination above 40 deg. has increased in recent years. The origin of these bodies, and in particular of those objects in retrograde orbits, is not well determined, and different scenarios are considered. In this paper, we present new observational and dynamical data of two objects in retrograde orbits, 2008 YB3 and 2005 VD. We find that the surface of these extreme objects is depleted of ices and does not contain the 'ultra-red' matter typical of some Centaurs. Despite small differences, these objects share common colors and spectral characteristics with the Trojans, comet nuclei, and the group of grey Centaurs. All of these populations are supposed to be covered by a mantle of dust responsible for their reddish- to neutral-color. To investigate if the surface properties and dynamical evolution of these bodies are related, we integrate their orbits for 10^(8) years to the past. We find a remarkable difference in their dynamical evolutions: 2005 VD' s evolution is dominated by a Kozai resonance with planet Jupiter while that of 2008 YB3 is dominated by close encounters with planets Jupiter and Saturn. Our models suggest that the immediate site of provenance of 2005 VD is the in the Oort cloud, whereas for 2008 YB3 it is in the trans-Neptunian region. Additionally, the study of their residence time shows that 2005 VD has spent a larger lapse of time moving in orbits in the region of the giant planets than 2008 YB3. Together with the small differences in color between these two objects, with 2005 VD being more neutral than 2008 YB3, this fact suggests that the surface of 2005 VD has suffered a higher degree of processing, probably related to cometary activity episodes.
description: 9 pages, 5 figures, Accepted by Astronomy and Astrophysics: 28 November 2012
Hardening and termination of long-duration gamma rays detected prior to lightning
Creators: name: Tsuchiya, H.
name: Enoto, T.
name: Iwata, K.
name: Yamada, S.
name: Yuasa, T.
name: Kitaguchi, T.
name: Kawaharada, M.
name: Nakazawa, K.
name: Kokubun, M.
name: Kato, H.
name: Okano, M.
name: Tamagawa, T.
name: Makishima, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We report the first observation of 3$-$30 MeV prolonged gamma-ray emission that was abruptly terminated by lightning. The gamma-ray detection was made during winter thunderstorms on December 30, 2010 by the Gamma-Ray Observation of Winter THunderclouds (GROWTH) experiment carried out in a coastal area along the Sea of Japan. The gamma-ray flux lasted for less than 3 min, continuously hardening closer to the lightning occurrence. The hardening at energies of 3$-$10 MeV energies was most prominent. The gamma-ray flux abruptly ceased less than 800 ms before the lightning flash that occurred over 5 km away from the experimental site. In addition, we observed a clear difference in the duration of the 3$-$10 MeV gamma rays and those $>$10 MeV, suggesting that the area of $>$10 MeV gamma-ray emission is considerably smaller than that of the lower-energy gamma rays. This work may give a manifestation that a local region emitting prolonged gamma rays connects with a distant region to initiate lightning.
description: Accepted for publication in Phys. Rev. Lett.; 14 pages, 4 figures
VIVO - eine Einführung
Creators: name: Hauschke, Christian
name: Walther, Tatiana
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: VIVO
subject: FIS
subject: CRIS
subject: Current Research Information System
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Für Neueinsteiger werden die wichtigsten Funktionalitäten von VIVO vorgestellt und können in einem bereitgestellten Demo-System von den TeilnehmerInnen auch selbst ausprobiert werden.
Figure of Women's Political Rights in Afghanistan after the fall of The Taliban Regime
Creators: name: Kibtiah, Tia Mariatul
Publisher: name: Zenodo
Year: 2024

description: This article is a key resource for IR studies, particularly in the area of gender equality in politics. The case study in this article focuses on Afghanistan, a country where political rights are still subject to discrimination and oppression. The data and figures presented in this article are crucial for advancing research in this field.
Generalized virial theorem in warped DGP brane-world
Creators: name: Heydari-Fard, Malihe
name: Heydari-Fard, Mohaddese
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We generalize the virial theorem to the warped DGP brane world scenario and consider its implications on the virail mass. In this theory the four dimensional scalar curvature term is included in the bulk action and the resulting four dimensional effective Einstein equation is augmented with extra terms which can be interpreted as geometrical mass, contributing to the gravitational energy. Estimating the geometrical mass using the observational data, we show that these geometric terms may account for the virial mass discrepancy in clusters of galaxies. Finally, we obtain the radial velocity dispersion of galaxy clusters and show that it is compatible with the radial velocity dispersion profle of such clusters.
description: 16 pages,3 figures, to appear in PRD. arXiv admin note: substantial text overlap with arXiv:1212.1805; and text overlap with arXiv:0908.2693, arXiv:0707.1128, arXiv:1009.5458, arXiv:0908.2690, arXiv:0710.0966, arXiv:astro-ph/0509576, arXiv:0807.1640 by other authors
A Participatory Universe of J. A. Wheeler as an Intentional Correlate of Embodied Subjects and an Example of Purposiveness in Physics
Creators: name: Nesteruk, Alexei V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: This paper investigates the role of human subjectivity and its delimiters in articulating the universe in physics and cosmology. As a case study, we reflect upon the complex of ideas of the so called Participatory Universe by later J. A. Wheeler. The objective of the paper is to explicate the role of the human agency as a centre of disclosure and manifestation of the universe as well the as teleology of scientific representation of the world implied by the intrinsic purposiveness of human actions.
description: 22 pages, 1 figure
The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818
Creators: name: Molaro, P.
name: Centurion, M.
name: Whitmore, J. B.
name: Evans, T. M.
name: Murphy, M. T.
name: Agafonova, I. I.
name: Bonifacio, P.
name: D'Odorico, S.
name: Levshakov, S. A.
name: Lopez, S.
name: Martins, C. J. A. P.
name: Petitjean, P.
name: Rahmani, H.
name: Reimers, D.
name: Srianand, R.
name: Vladilo, G.
name: Wendt, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Absorption line systems detected in quasar spectra can be used to compare the value of the fine-structure constant, α, measured today on Earth with its value in distant galaxies. In recent years, some evidence has emerged of small temporal and also spatial variations of α on cosmological scales which may reach a fractional level of ~ 10 ppm (parts per million). To test these claims we are conducting a Large Program with the VLT UVES . We are obtaining high-resolution (R ~ 60000 and high signal-to-noise ratio (S/N ~ 100) UVES spectra calibrated specifically for this purpose. Here we analyse the first complete quasar spectrum from this Program, that of HE 2217-2818. We apply the Many Multiplet method to measure α in 5 absorption systems towards this quasar: zabs = 0.7866, 0.9424, 1.5558, 1.6279 and 1.6919. The most precise result is obtained for the absorber at zabs = 1.6919 where 3 Fe II transitions and Al II λ1670 have high S/N and provide a wide range of sensitivities to α. The absorption profile is complex, with several very narrow features, and requires 32 velocity components to be fitted to the data. Our final result for the relative variation in α in this system is Deltaα/α = +1.3 +/- 2.4stat +/- 1.0sys ppm. This is one of the tightest current bounds on α variation from an individual absorber. The absorbers towards quasar HE 2217-2818 reveal no evidence for variation in α at the 3 ppm precision level (1σ confidence). If the recently reported 10 ppm dipolar variation of α across the sky were correct, the expectation at this sky position is (3.2-5.4) +/-1.7 ppm depending on dipole model used . Our constraint of Deltaα/α=+1.3+/-2.4stat +/-1.0sys ppm is not inconsistent with this expectation.
description: 17 pages, 8 figures, accepted Astronomy Astrophysics 2013
Kompetenzen für das FIS- und Daten-Management
Creators: name: Blümel, Ina
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: vivode18
subject: Forschungsinformationssystem
subject: Kompetenzen
subject: Ausbildung
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Der Beitrag beleuchtet die verschiedenen Kompetenzbereiche, die für das Management von forschungsrelevanten Informationen und Daten, Administration und Weiterentwicklung der Systeme, sowie für die Community-Arbeit notwendig sind und diskutiert aktuelle Ansätze und Herausforderungen der informationswissenschaftlichen Aus- und Weiterbildung zur Deckung der Bedarfe.
Reporting mit VIVO und Kibana
Creators: name: Hauschke, Christian
name: Walther, Tatiana
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Kerndatensatz Forschung
subject: KDSF
subject: Reporting
subject: Research Analytics
subject: Research Intelligence
subject: Visualization
subject: Research Information
subject: VIVO
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: In diesem Workshop wird gezeigt, wie man Forschungsinformationen für Berichtszwecke in VIVO erfassen und berichtsbezogene Fragestellungen beantworten kann.
The Thousand Star Magnitudes in the Catalogues of Ptolemy, Al Sufi, and Tycho Are All Corrected For Atmospheric Extinction
Creators: name: Schaefer, Bradley E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: Three pre-telescopic star catalogues contain about a thousand star magnitudes each (with magnitudes 1, 2, 3, 4, 5, and 6), with these reported brightnesses as the original basis for what has become the modern magnitude scale. These catalogues are those of Ptolemy (c. 137, from Alexandria at a latitude of 31.2), Al Sufi (c. 960, from Isfahan at a latitude of 32.6), and Tycho Brahe (c. 1590, from the island of Hven at a latitude of 55.9). Previously, extensive work has been made on the positions of the catalogued stars, but only scant attention has been paid to the magnitudes as reported. These magnitudes will be affected by a variety of processes, including the dimming of the light by our Earth's atmosphere (atmospheric extinction), the quantization of the brightnesses into magnitude bins, and copying or influence from prior catalogues. This paper provides a detailed examination of these effects. Indeed, I find all three catalogues to report magnitudes that have near-zero extinction effects, so the old observers in some way extinction corrected their observations.
description: Four appendices appear only in the on-line edition available to subscribers (see http://www.shpltd.co.uk/jha.html), or in the last half of this arXiv PDF file
Forschungsevaluation und Visualisierung von Zitationsnetzwerken
Creators: name: Hauschke, Christian
name: Fraumann, Grischa
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Research Analytics
subject: Research Intelligence
subject: ROSI
subject: VIVO
subject: Open Citations
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Vortrag beim 2. LOC-DB-Workshop 2018 in Mannheim
Supporting a VIVO Regional Community
Creators: name: Hauschke, Christian
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: VIVO
subject: Research Information
subject: Community Building
subject: Ontology Management
subject: Linked Data
subject: i18n
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: VIVO is member-supported, open source software and an ontology for representing scholarship. VIVO supports recording, editing, searching, browsing, and visualizing scholarly activity. VIVO encourages showcasing the scholarly record, research discovery, expert finding, network analysis, and assessment of research impact. When installed and populated with researcher interests, activities, and accomplishments by an institution, VIVO enables the discovery of research and scholarship across disciplines at that institution and beyond. When VIVO is implemented in a research institution, there is a need to adjust the software to local needs. If a system has its roots in a different country, the adjustments can be more comprehensive. The VIVO ontology and a lot of the underlying assumptions, which are based on the realities of the US scholarly landscape, must be “tailored” to be able to depict the academic culture. The differences concern both the meaning of the translated terms and the usage of the terms in the common language use. This one-hour webinar aims at explaining some of the differences we have experienced while trying to make VIVO compliant to the needs of the German VIVO community. Our motives, goals, tools, and means of communication will be introduced to help others learn from our experiences. Time will be reserved for questions following the presentation. Space is limited and pre-registration is required.
A Two Intermediates Audio Steganography Technique
Creators: name: Bassil, Youssef
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: On the rise of the Internet, digital data became openly public which has driven IT industries to pay special consideration to data confidentiality. At present, two main techniques are being used: Cryptography and Steganography. In effect, cryptography garbles a secret message turning it into a meaningless form; while, steganography hides the very existence of the message by embedding it into an intermediate such as a computer file. In fact, in audio steganography, this computer file is a digital audio file in which secret data are concealed, predominantly, into the bits that make up its audio samples. This paper proposes a novel steganography technique for hiding digital data into uncompressed audio files using a randomized algorithm and a context-free grammar coupled with a lexicon of words. Furthermore, the proposed technique uses two intermediates to transmit the secret data between communicating parties: The first intermediate is an audio file whose audio samples, which are selected randomly, are used to conceal the secret data; whereas, the second intermediate is a grammatically correct English text that is generated at runtime using a context-free grammar and it encodes the location of the random audio samples in the audio file. The proposed technique is stealthy and irrecoverable in a sense that it is difficult for unauthorized third parties to detect the presence of and recover the secret data. Experiments conducted showed how the covering and the uncovering processes of the proposed technique work. As future work, a semantic analyzer is to be developed so as to make the intermediate text not only grammatically correct but also semantically plausible.
description: LACSC - Lebanese Association for Computational Sciences, http://www.lacsc.org. arXiv admin note: substantial text overlap with arXiv:1212.2064
title: What People Believe About Monetary Finance and What We Can(’t) Do About It: Evidence from a Large-Scale, Multi-Country Survey Experiment
Creators: name: Hommes, Cars
name: Pinter, Julien
name: Salle, Isabelle
Publisher: name: Bank of Canada
Year: 2023

description: We conduct an experiment within a large-scale household survey on public finance in France, the Netherlands and Italy. We elicit prior beliefs via open-ended questions and introduce a measure of macroeconomic policy literacy. An educational blog post from a central bank (CB) that opposes monetary-financed policies preceded by a short video on public finance can induce less support for monetary-financed proposals and more support for fiscal discipline and CB independence, no matter the respondent’s level of literacy. However, prior beliefs matter, and contradictory information may be polarizing. Information affects the respondents’ views by shifting their inflation and tax expectations associated to these policies.
description: Nous menons une expérience dans le cadre d’une enquête à grande échelle sur les finances publiques auprès des ménages en France, aux Pays-Bas et en Italie. Nous faisons ressortir les opinions préalables au moyen de questions ouvertes et introduisons une mesure des connaissances en matière de politique macroéconomique. Nous constatons qu’un article de blogue éducatif d’une banque centrale qui s’oppose aux politiques de financement monétaire, précédé d’une courte vidéo sur les finances publiques, peut induire un soutien moindre pour les propositions de financement monétaire et un soutien plus fort pour la discipline budgétaire et l’indépendance des banques centrales, quel que soit le niveau des connaissances du répondant en matière de politique économique. Cependant, les opinions préalables ont leur importance, et l’information contradictoire peut être polarisante. L’information influence les opinions des répondants en modifiant leurs anticipations en matière d’inflation et d’impôt associées à ces politiques.
Distributed Optimization With Local Domains: Applications in MPC and Network Flows
Creators: name: Mota, João F. C.
name: Xavier, João M. F.
name: Aguiar, Pedro M. Q.
name: Püschel, Markus
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Information Theory (cs.IT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In this paper we consider a network with $P$ nodes, where each node has exclusive access to a local cost function. Our contribution is a communication-efficient distributed algorithm that finds a vector $x^\star$ minimizing the sum of all the functions. We make the additional assumption that the functions have intersecting local domains, i.e., each function depends only on some components of the variable. Consequently, each node is interested in knowing only some components of $x^\star$, not the entire vector. This allows for improvement in communication-efficiency. We apply our algorithm to model predictive control (MPC) and to network flow problems and show, through experiments on large networks, that our proposed algorithm requires less communications to converge than prior algorithms.
description: Submitted to IEEE Trans. Aut. Control
Carex curvula All.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: C. curvula All. Cat. 363 und 432. Vgl. Gilomen Lit. 1937,1938und 1941. Bis 3180m. l: Luisin (Exk. Soc. Murith.); Emosson, 1750 m (P. Jaccard). - 2: Ferdenpass (J.). - 3: Hohe Stellen: Gornergrat bei Zermatt, 3115m (Braun-Blanquet 1919); Oberrothorn bei Zermatt, 3130 m (idem 1919); Valsorey, 3180m (Guyot). - 4: Rappental (B.C.W.). Var. major Godron (var. longearistataE.Steiger) - 2:GrandChavalard(Garns). Ssp.RosaeGilomen- VorwiegendaufKalkrohbödenundHumuskarbonatböden.NachGilomenauf den Kalkschiefern der penninischen Decken vom Val de Bagnes bis zum Nufenenpass und zur Furka;besondershäufigin der Gegendvon Zermatt;in derNordketteanderDentdeMordes,an der Gemmi, in der Umgebung von Leukerbad und auf der Südseite des Lötschenpasses; z.B.: 2: Torrenthorn (Gilomen); Gemmi: Roter Totz-Felsenhorn (idem), Daubensee und Lämmerngrat (Schmid). - 3: Col du Zate (Schmid); Oberrothorn bei Zermatt, bis 3130 m (Gilomen); ob Saas- Fee zwischenRitzji und Galen (Lüdi,Merxmüller u. a.). - 4: Bettlihorn und Breithorn im Binntal (Binz).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Preserving information on mathematical software via web archives
Creators: name: Holzmann, Helge
name: Runnwerth, Mila
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Web Archive
subject: Digital Library
subject: Software
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Software is an essential ingredient in mathematical research especially in numerical analysis, mathematical modelling, and statistics. However, the traditional publication process has not come up with a satisfyingly neat solution to reference software yet, taking into account its dynamics in order to allow for reproducibility. While software on GitHub might be ”cited” by linking to the repository including the precise commit given by its SHA signature, commercial software can only be referenced by its web presence most of the time. In 2016, we evaluated swMath, a database for information on mathematical software, on how a software’s archived web site reflects its development. We found, although some web sites are already archived and indeed provide a temporal overview of their corresponding software’s development including documentation, there is need for improvement. In 2017, we presented a demo framework to archive and cite software homepages adding a time stamp. Our vision is a service to archive semantically linked web sites of mathematical software on the basis of swMATH. The resulting archive contains all information on the software at a specific time and can be cited in a traditional publication via DOI.
Practical Implementation of High-Order Multiple Precision Fully Implicit Runge-Kutta Methods with Step Size Control Using Embedded Formula
Creators: name: Kouya, Tomonori
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: G.1.0; G.1.7; G.1.8
subject: 65L06

description: We propose a practical implementation of high-order fully implicit Runge-Kutta(IRK) methods in a multiple precision floating-point environment. Although implementations based on IRK methods in an IEEE754 double precision environment have been reported as RADAU5 developed by Hairer and SPARK3 developed by Jay, they support only 3-stage IRK families. More stages and higher-order IRK formulas must be adopted in order to decrease truncation errors, which become relatively larger than round-off errors in a multiple precision environment. We show that SPARK3 type reduction based on the so-called W-transformation is more effective than the RADAU5 type one for reduction in computational time of inner iteration of a high-order IRK process, and that the mixed precision iterative refinement method is very efficient in a multiple precision floating-point environment. Finally, we show that our implementation based on high-order IRK methods with embedded formulas can derive precise numerical solutions of some ordinary differential equations.
Micro Archives as Rich Digital Object Representations
Creators: name: Holzmann, Helge
name: Runnwerth, Mila
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Web Archive
subject: Software
subject: Temporal Web Search
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: Digital objects as well as real-world entities are commonly referred to in literature or on the Web by mentioning their name, linking to their website or citing unique identifiers, such as DOI and ORCID, which are backed by a set of meta information. All of these methods have severe disadvantages and are not always suitable though: They are not very precise, not guaranteed to be persistent or mean a big additional effort for the author, who needs to collect the metadata to describe the reference accurately. Especially for complex, evolving entities and objects like software, pre-defined metadata schemas are often not expressive enough to capture its temporal state comprehensively. We found in previous work that a lot of meaningful information about software, such as a description, rich metadata, its documentation and source code, is usually available online. However, all of this needs to be preserved coherently in order to constitute a rich digital representation of the entity. We show that this is currently not the case, as only 10% of the studied blog posts and roughly 30% of the analyzed software websites are archived completely, i.e., all linked resources are captured as well. Therefore, we propose Micro Archives as rich digital object representations, which semantically and logically connect archived resources and ensure a coherent state. With Micrawler we present a modular solution to create, cite and analyze such Micro Archives. In this paper, we show the need for this approach as well as discuss opportunities and implications for various applications also beyond scholarly writing.
Do researchers need to care about PID systems?
Creators: name: Kraft, Angelina
name: Dreyer, Britta
Publisher: name: Leibniz Universität Hannover
Year: 2018
Subjects: subject: Survey
subject: Information Science
subject: PID
subject: DOI
subject: Identifier
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::020 | Bibliotheks- und Informationswissenschaft

description: A survey across 1400 scientists in the natural sciences and engineering across Germany conducted in 2016 revealed that although more than 70 % of the researchers are using DOIs for journal publications, less than 10% use DOIs for research data. To the question of why they are not using DOIs more than half (56%) answered that they don’t know about the option to use DOIs for other publications (datasets, conference papers etc.) Therefore it is not surprising that the majority (57 %) stated that they had no need for DOI counselling services. 40% of the questioned researchers need more information and almost 30% cannot see a benefit. Publishers have been using PID systems for articles for years, and the DOI registration and citation are a natural part of the standard publication workflow. With the new digital age, the possibilities to publishing digital research objects beyond articles are bigger than ever – but the respective infrastructure providers are still struggling to provide integrated PID services. Infrastructure providers need to learn from publishers and offer integrated PID services, complementing existing workflows, using researcher’s vocabulary to support usability and promotion. Sell the benefit and enable researchers to focus on what they are best at: Do research (and not worry about the rest)!