cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Numerical investigation of mechanical axial dispersion in slender fixed-beds
Creators: name: Jurtz, Nico
name: Schönherr, Tobias David
name: Kraume, Matthias
Publisher: name: Technische Universität Berlin
Year: 2021
Subjects: subject: 660 Chemische Verfahrenstechnik
subject: axial dispersion
subject: complex particle shapes
subject: fixed-bed reactor
subject: particle-resolved CFD
subject: wall structures

description: The description of the mixing characteristics is of fundamental interest for modeling mass transport in fixed-bed reactors. A method based on Lagrangian parcel tracking is presented to determine the axial dispersion coefficient in the mechanical dispersion regime from particle-resolved computational fluid dynamics (CFD) results. The impact of fluid dynamic entry effects and the necessary averaging length on the axial dispersion coefficient is studied, showing that the often reported dependency on the entry length is almost not existent, but a result of insufficient averaging, caused by to short bed heights. The axial dispersion coefficients are determined for different particle shapes and a novel reactor wall concept. A strong correlation is found between the relative variance of the axial velocity and the axial dispersion coefficient.
Offset between X-ray and optical centers in clusters of galaxies: connecting eROSITA data and simulations
Creators: name: Seppi, R.
name: Comparat, J.
name: Nandra, K.
name: Dolag, K.
name: Biffi, V.
name: Bulbul, E.
name: Liu, A.
name: Ghirardini, V.
name: Ider-Chitham, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The characterization of the dynamical state of clusters is key to study their evolution, their selection, and use them as a cosmological probe. The offsets between different definitions of the center have been used to estimate the cluster disturbance. Our goal is to study the distribution of the offset between the X-ray and optical centers in clusters of galaxies. We study the offset for eROSITA clusters. We aim to connect observations to hydrodynamical simulations and N-body models. We assess the astrophysical effects affecting the displacements. We measure the offset for clusters observed in eFEDS and eRASS1. We focus on a subsample of 87 massive eFEDS clusters at low redshift. We link the observations to the offset parameter Xoff measured on dark matter halos in N-body simulations, using the hydrodynamical simulations as a bridge. eFEDS clusters show a smaller offset compared to eRASS1, because the latter contains a larger fraction of massive and disturbed structures. We measure an average offset of 76.3+30.1-27.1 kpc on the subsample of 87 eFEDS clusters. This is in agreement with the predictions from TNG and Magneticum, and the distribution of Xoff from DMO simulations. The tails of the distributions are different. Using the offset to classify relaxed and disturbed clusters, we measure a relaxed fraction of 31% in the eFEDS subsample. Finally, we find a correlation between the offset in hydrodynamical simulations and Xoff measured on their parent DMO run and calibrate a relation between them. There is good agreement between eROSITA data and simulations. Baryons cause a decrement (increment) in the low (high) offset regime compared to the Xoff distribution. The offset-Xoff relation provides an accurate prediction of the true Xoff distribution in Magneticum and TNG. It allows introducing the offsets in cosmology, marginalizing on dynamical selection effects.
description: Accepted for publication on A&A
The hypermagnetic power spectra and the phases of Sakharov oscillations
Creators: name: Giovannini, Massimo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: If the gauge fields are amplified from the inflationary vacuum, the quantum mechanical initial data correspond to travelling waves that turn asymptotically into standing waves whose phases only depend on the evolution of the gauge coupling. We point out that these gauge analogs of the Sakharov oscillations are exchanged by the duality symmetry and ultimately constrain both the relative scaling of the hypermagnetic power spectra and their final asymptotic values. Unlike the case of the density contrasts in a relativistic plasma, the standing oscillations never develop since they are eventually overdamped by the finite value of the conductivity as soon as the corresponding modes are comparable with the expansion rates after inflation. We show that the late-time value of the magnetic field is not determined at radiation dominance (and in spite of the value of the wavenumber) but it depends on the moment when the wavelengths (comparable with the Mpc) get of the order of the Hubble radius before equality. This means that the magnetogenesis requirements are only relaxed if the post-inflationary expansion rate is slower than radiation but the opposite is true when the plasma expands faster than radiation and the corresponding power spectra are further suppressed. After combining the present findings with the evolution of the gauge coupling we show that these results are consistent with a magnetogenesis scenario where the gauge coupling is always perturbative during the inflationary stage while, in the dual case, the same requirements cannot be satisfied.
description: 40 pages, 11 figures
การแทรกค่าเชิงพื้นที่ของความลึกดินโดยใช้วิธีการและจำนวนจุดตัวอย่างที่แตกต่างกันบริเวณลุ่มน้ำห้วยคอกม้า จังหวัดเชียงใหม่
Creators: name: ปรารถนา ชุมทอง
Publisher: name: King Mongkut’s University of Technology Thonburi
Year: 2022
Subjects: Spatial Interpolation
Soil Depth
Kog Ma Watershed

description: KMUTT Research and Development Journal, 45, 3, 295-308
Isospin-Violating Dark Matter with Colored Mediators
Creators: name: Hamaguchi, Koichi
name: Liew, Seng Pei
name: Moroi, Takeo
name: Yamamoto, Yasuhiro
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In light of positive signals reported by the CDMS-II Si experiment and the recent results of the LUX and SuperCDMS experiments, we study isospin-violating dark matter scenarios assuming that the interaction of the dark matter is mediated by colored particles. We investigate the phenomenology of the model, including collider searches, flavor and CP phenomenology. A minimal possible scenario includes scalar dark matter and new vector-like colored fermions with masses of O(1) TeV as mediators. Such a scenario may be probed at the 14 TeV LHC, while flavor and CP constraints are stringent and severe tuning in the couplings is unavoidable. We also found that, as an explanation of the CDMS-II Si signal, isospin-violating fermionic dark matter models with colored scalar mediators are disfavored by the LHC constraints.
description: 22 pages, 2 figures. Added references. Published version
Distant Reading Sentiments and Emotions in Historic German Plays
Creators: name: Schmidt, Thomas
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: Sentiment Analysis, Distant Reading, Computational Literary Studies, Tool, Lessing, Visualization
subject: 004 Informatik
subject: 020 Bibliotheks- und Informationswissenschaft
subject: 400 Sprachwissenschaft, Linguistik
subject: 800 Literatur, Rhetorik, Literaturwissenschaft
subject: 830 Deutsche Literatur

description: Sentiment and emotions are important parts of the analysis and interpretation of literary texts, especially of plays. Therefore, the computational method to analyze sentiments and emotions in written text, sentiment analysis, has found its way into computational literary studies. However, recent research in computational literary studies is focused on annotation and the evaluation of different approaches. We present a tool to investigate the possibilities of Distant Reading the sentiments and emotions expressed in the plays of Lessing. Researchers can explore polarity and emotion distributions and progression on concerning structural and character based levels but also character relations. We present various use cases to highlight the visualizations and functionalities of our tool and discuss how Distant Reading of sentiments can add value to research in literary studies.
Life Cycle of Superfluid Vortices and Quantum Turbulence in the Unitary Fermi Gas
Creators: name: Wlazłowski, Gabriel
name: Bulgac, Aurel
name: Forbes, Michael McNeil
name: Roche, Kenneth J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The unitary Fermi gas (UFG) offers an unique opportunity to study quantum turbulence both experimentally and theoretically in a strongly interacting fermionic superfluid. It yields to accurate and controlled experiments, and admits the only dynamical microscopic description via time-dependent density functional theory (DFT) - apart from dilute bosonic gases - of the crossing and reconnection of superfluid vortex lines conjectured by Feynman in 1955 to be at the origin of quantum turbulence in superfluids at zero temperature. We demonstrate how various vortex configurations can be generated by using well established experimental techniques: laser stirring and phase imprinting. New imagining techniques demonstrated by the MIT group [Ku et al. arXiv:1402.7052] should be able to directly visualize these crossings and reconnections in greater detail than performed so far in liquid helium. We demonstrate the critical role played by the geometry of the trap in the formation and dynamics of a vortex in the UFG and how laser stirring and phase imprint can be used to create vortex tangles with clear signatures of the onset of quantum turbulence.
description: 4 pages + supplement. Added comparison with ETF model and quantum turbulence. Includes links to movies online at http://www.phys.washington.edu/~bulgac/media_files/VR2
Multiple shock fronts in RBS 797: the Chandra window on shock heating in galaxy clusters
Creators: name: Ubertosi, F.
name: Gitti, M.
name: Brighenti, F.
name: McDonald, M.
name: Nulsen, P.
name: Donahue, M.
name: Brunetti, G.
name: Randall, S.
name: Gaspari, M.
name: Ettori, S.
name: Calzadilla, M.
name: Ignesti, A.
name: Feretti, L.
name: Blanton, E. L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using $\sim$427 ks of Chandra observations, we present a study of shock heating and ICM cooling in the galaxy cluster RBS 797. We discover three nested pairs of weak shocks at roughly 50 kpc, 80 kpc and 130 kpc from the center. The total energy associated with the shocks is $\sim6\times10^{61}$ erg, with the central AGN driving a pair of weak shocks every 20-30 Myr with a power $P_{sh}\approx10^{46}$ erg s$^{-1}$. Based on its morphology and age ($\sim$30 Myr), the inner cocoon shock is associated with the four equidistant X-ray cavities previously discovered. From the thermodynamic analysis of the inner 30 kpc, we find evidence for ICM condensation into colder gas between and behind the X-ray cavities. The total AGN mechanical power (cavities and shocks) of $3.4\times10^{46}$ erg s$^{-1}$ can balance the ICM radiative losses, estimated as $L_{cool} = 2.3\times10^{45}$ erg s$^{-1}$. By building plots of $P_{cav}$ vs. $L_{cool}$, $P_{shock}$ vs. $L_{cool}$ and $P_{tot}$ vs. $L_{cool}$ for RBS 797 and 14 other galaxy clusters, groups and elliptical galaxies where both cavities and shocks are detected, we verify that the most powerful outbursts are found in the strongest cooling systems. Ultimately, we observe that the mechanical power of the AGN exceeds the gas radiative losses by a factor that is different for FR I and FR II radio galaxies, being less than a few tens for FR Is (as RBS 797) and more than roughly a hundred for FR IIs.
description: Accepted for publication in ApJ
Systematisches Review von Lernverlaufsmessung im Bereich der frühen Leseflüssigkeit
Creators: name: Jungjohann, J.
name: Gegenfurtner, Andreas
name: Gebhardt, Markus
Publisher: name: Universität Regensburg
Year: 2018
Subjects: subject: 370 Erziehung, Schul- und Bildungswesen

description: Mit Hilfe von Lernverlaufsmessungen können Lehrkräfte Schwierigkeiten im Leseerwerb identifizieren und eine passende Förderung initiieren. Die Leseflüssigkeit ist ein robuster Indikator der Lesekompetenz, für die mehrere formative Testverfahren konstruiert wurden. In diesem systematischen Review werden empirisch belegte formative Testverfahren für den Leseunterricht der ersten drei Schuljahre dargestellt und die aktuelle Entwicklung für die Schulpraxis sowie wissenschaftliche Forschung abgeleitet. Insgesamt wurden acht Testverfahren zur Leseflüssigkeit aus begutachteten nationalen und internationalen Zeitschriften identifiziert. Die Entwicklungen, Gestalt und Evaluationen dieser Verfahren werden im Hinblick auf zukünftige Forschungsbemühungen ausgewertet, synthetisiert und diskutiert. Die Testverfahren sind überwiegend unabhängig von Testbatterien oder Förderkonzepten, als pen&paper Version verfügbar und nach klassischer Testtheorie konstruiert. Besonders die Überprüfung mittels der Item-Response-Theorie und die Messinvarianz sowie die Nutzung digitaler Versionen stehen für diese Testverfahren noch aus. (DIPF/Orig.). With the help of formative assessment instruments, teachers can identify and support children who have reading difficulties. Reading fluency is a robust indicator of reading ability in many existing formative assessments. This systematic literature review discusses different tests for the formative assessment of reading fluency in grades 1 to 3 and makes scientific recommendations for their scientific development and practical use. In total, eight formative assessments of reading fluency were identified from national and international peer reviewed journals. This review describes how these eight formative assessment instruments have been developed, how they are used, and how the test outcomes are evaluated. The aim is to offer implications for future research. These assessments are independent from existing test batteries or materials, they are administered by pen and paper, and were constructed based on classical test theory. Future research can test these assessment instruments with item-response-theory, estimate their measurement invariance, and validate computer-based test versions. (DIPF/Orig.).
Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
Creators: name: Berlin, Asher
name: Gratia, Pierre
name: Hooper, Dan
name: McDermott, Samuel D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The gamma-ray excess observed from the Galactic Center can be interpreted as dark matter particles annihilating into Standard Model fermions with a cross section near that expected for a thermal relic. Although many particle physics models have been shown to be able to account for this signal, the fact that this particle has not yet been observed in direct detection experiments somewhat restricts the nature of its interactions. One way to suppress the dark matter's elastic scattering cross section with nuclei is to consider models in which the dark matter is part of a hidden sector. In such models, the dark matter can annihilate into other hidden sector particles, which then decay into Standard Model fermions through a small degree of mixing with the photon, Z, or Higgs bosons. After discussing the gamma-ray signal from hidden sector dark matter in general terms, we consider two concrete realizations: a hidden photon model in which the dark matter annihilates into a pair of vector gauge bosons that decay through kinetic mixing with the photon, and a scenario within the generalized NMSSM in which the dark matter is a singlino-like neutralino that annihilates into a pair of singlet Higgs bosons, which decay through their mixing with the Higgs bosons of the MSSM.
description: 11 pages, 8 figures; v2: added discussion of AMS positron constraints; v3: matches journal version
Interpretation of the effect of transient process data on part quality of injection molding based on explainable artificial intelligence
Creators: name: Gim, Jinsu
name: Turng, Lih-Sheng
Publisher: name: Taylor & Francis
Year: 2023
Subjects: Space Science
Environmental Sciences not elsewhere classified
Biological Sciences not elsewhere classified
Information Systems not elsewhere classified
Mathematical Sciences not elsewhere classified
Marine Biology
Cancer
Science Policy

description: This paper proposes an interpretation methodology for the effect of transient process data on quality of injection molded parts. The transient process data measured in the actual processing space have been regarded as the most relevant information to manufacturing processes and product quality. However, its interpretation to pinpoint which feature in the data would affect part quality has traditionally relied on knowledge and understanding of the manufacturing process. The main objective of this method is to reduce the dependency of the transient process data analysis on process knowledge and understanding by using explainable artificial intelligence (XAI). The contribution of the ‘section-wise' features in the transient process data to the quality prediction of machine learning (ML) models was investigated for the first time. The interpretation results of the effect of cavity pressure and mold surface temperature on four different quality factors represented reasonable explanations of the characteristics of the polymer materials, product geometry, and molding process. Due to the intermediate relationship of the transient process data with the user-specified process parameters and the resulting quality variables, the interpretation results can be further utilized to optimize the process and provide the optimal transient process data profile for best part quality.
Local and large-scale effects on the astrophysics of void-galaxies
Creators: name: Rodríguez-Medrano, Agustín M.
name: Paz, Dante J.
name: Stasyszyn, Federico A.
name: Rodríguez, Facundo
name: Ruiz, Andrés N.
name: Merchán, Manuel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Galaxies in cosmic voids have been reported with properties related to a delayed evolution with respect to the Universe in general. These characteristics reflect the interaction of galaxies with the environment. However, it is not clear the degree of influence of the large-scale structure on the properties of void galaxies or, if these are only influenced by the low local density around them typical of these regions. In this article we identified cosmic voids in the SDSS-DR16 and studied various properties of galaxies, such as g-r colour, star formation rate, and concentration. To characterise the local environment, we have identified groups of galaxies and studied their properties as a function of their dark matter and stellar masses, analysing separately those found in voids and in the general sample. Our results show that galaxies that inhabit haloes of a given mass (below \sim 10^13.5 M_\dot ), are bluer, have a higher star formation rate and are less concentrated when the host halo is inside voids compared to other regions. For larger halo masses, the trend disappears. We also analyse whether the properties of galaxies are sensitive to the type of voids that inhabit. This is done by separating voids embedded in overdense regions (S-type) from those that asymptotically converge to the average density of the universe (R-type). We found that galaxies in R-type voids are bluer, with higher SFR and less concentration than in S-type voids. Our results indicate some degree of correlation of galaxy properties with the large-scale environment provided by voids, suggesting possible second-order mechanisms in galaxy evolution.
description: 10 pages, 9 figures. Acccepted for publication in MNRAS
Can TeVeS be a viable theory of gravity?
Creators: name: Chaichian, Masud
name: Kluson, Josef
name: Oksanen, Markku
name: Tureanu, Anca
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Among modified gravitational theories, the Tensor-Vector-Scalar (TeVeS) occupies a special place -- it is a covariant theory of gravity that produces the modified Newtonian dynamics (MOND) in the nonrelativistic weak field limit and explains the astrophysical data at scales larger than that of the Solar System, without the need of an excessive amount of invisible matter. We show that, in contrast to other modified theories, TeVeS is free from ghosts. These achievements make TeVeS (and its nonrelativistic limit) a viable theory of gravity. A speculative outlook on the emergence of TeVeS from a quantum theory is presented.
description: 10 pages, v2: Discussions on the degrees of freedom and the positivity of total energy extended, presentation improved, added three new references, to be published in Phys. Lett. B
Electric control of tunneling energy in graphene double dots
Creators: name: Raith, Martin
name: Ertler, Christian
name: Stano, Peter
name: Wimmer, Michael
name: Fabian, Jaroslav
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically investigate the spectrum of a single electron double quantum dot, defined by top gates in a graphene with a substrate induced gap. We examine the effects of electric and magnetic fields on the spectrum of localized states, focusing on the tunability of the inter-dot coupling. We find that the substrate induced gap allows for electrostatic control, with some limitations that for a fixed inter-dot distance, the inter-dot coupling can not be made arbitrarily small due to the Klein tunneling. On the other hand, the proximity of the valence band in graphene allows for new regimes, such as an $npn$ double dot, which have no counterparts in GaAs.
description: 7 pages, 11 figures, minor changes reflecting referee reports and proofs
Die Perspektive eines geisteswissenschaftlichen Fachrepositoriums auf kooperative Ansätze der OATransformation – das Beispiel media/rep/. Open Access Tage 2022
Creators: name: Matuszkiewicz, Kai
Publisher: name: Zenodo
Year: 2022
Subjects: subject: Open Access
subject: Green Open Access
subject: Open Access Transformation
subject: Disciplinary Repository
subject: Humanities
subject: FOS: Humanities
subject: Community Building
subject: Media Studies

description: Presentation given as part of the workshop "Jenseits von DEAL - Kooperative Ansätze für die Open-Access-Transformation in den Sozial- und Geisteswissenschaften" on monday, 19 September 2022.
CuSe-based layered compound Bi$_{2}$YO$_{4}$Cu$_{2}$Se$_{2}$ as a quasi-two-dimensional metal
Creators: name: Tan, S. G.
name: Shao, D. F.
name: Lu, W. J.
name: Yuan, B.
name: Liu, Y.
name: Yang, J.
name: Song, W. H.
name: Lei, Hechang
name: Sun, Y. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have investigated the physical properties of a new layered oxyselenide Bi$_{2}$YO$_{4}$Cu$_{2}$Se$_{2}$, which crystallizes in an unusual intergrowth structure with Cu$_{2}$Se$_{2}$ and Bi$_{2}$YO$_{4}$ layers. Electric transport measurement indicates that Bi$_{2}$YO$_{4}$Cu$_{2}$Se$_{2}$ behaves metallic. Thermal transport and Hall measurements show that the type of the carriers is hole-like and it may be a potential thermoelectric material at high temperatures. First principle calculations are in agreement with experimental results and show that Bi$_{2}$YO$_{4}$Cu$_{2}$Se$_{2}$ is a quasi-2D metal. Further theoretical investigation suggests the ground states of the Bi$_{2}$YO$_{4}$Cu$_{2}$Se$_{2}$-type can be tuned by designing the blocking layers, which will enrich the physical properties of these compounds.
Unraveling models of CP violation through electric dipole moments of light nuclei
Creators: name: Dekens, W.
name: de Vries, J.
name: Bsaisou, J.
name: Bernreuther, W.
name: Hanhart, C.
name: Meißner, Ulf-G.
name: Nogga, A.
name: Wirzba, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that the proposed measurements of the electric dipole moments of light nuclei in storage rings would put strong constraints on models of flavor-diagonal CP violation. Our analysis is exemplified by a comparison of the Standard Model including the QCD theta term, the minimal left-right symmetric model, a specific version of the so-called aligned two-Higgs doublet model, and briefly the minimal supersymmetric extension of the Standard Model. By using effective field theory techniques we demonstrate to what extend measurements of the electric dipole moments of the nucleons, the deuteron, and helion could discriminate between these scenarios. We discuss how measurements of electric dipole moments of other systems relate to the light-nuclear measurements.
description: Published version
The Sun at millimeter wavelengths IV. Magnetohydrodynamic waves in small-scale bright features
Creators: name: Gómez, Juan Camilo Guevara
name: Jafarzadeh, Shahin
name: Wedemeyer, Sven
name: Grant, Samuel D. T.
name: Eklund, Henrik
name: Szydlarski, Mikolaj
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We used solar observations of a plage/enhanced network with the Atacama Large Millimeter/sub-millimeter Array (ALMA) in Band 3 and Band 6 together with synthetic continuum maps from numerical simulations with Bifrost at the same bands to carry out a detailed study of bright small-scale magnetic features. To this end, we have used an algorithm to automatically identify and trace the features within the field of view (FoV) of the observations and the simulation. We found 193 and 293 features in the Bands 3 and 6 observations, respectively. In the degraded simulation, the total number of features were 24 for Band 3 and 204 for Band 6. In the original simulation, the total number of features were 36 for Band 3 and 392 for Band 6. Based on the simulation, we confirm the magnetic nature of the features which exhibit an oscillatory behaviour in temperature, size and horizontal velocity. The average oscillation periods were of 30-99\,s for temperature, 37-92\,s for size and 37-78\,s for horizontal velocity. There are indications for the possible presence of transverse (kink) waves with average amplitude velocities of 2.1-5.0\,km\,s$^{-1}$. An anti-phase behaviour between temperature and size oscillations suggest the presence of compressible fast-sausage Magnetohydrodynamics (MHD) modes. Finally, we have estimated the flux of energy of the fast-sausage waves at the chromospheric heights sampled by ALMA as 453-1838\,W\,m$^{-2}$ for Band 3 and 3640-5485\,W\,m$^{-2}$ for Band 6. The decrease of wave energy-flux with height (from Band 6 to Band 3) could possibly suggest energy dissipation at chromospheric heights, thus wave heating, with the assumptions that the identified small-scale waves are typical at each band and they propagate upward through the chromosphere.
description: 15 pages, 11 figures. Accepted for publication in Astronomy and Astrophysics. Abstract has been shorten to fulfil Arxiv requirements
Generic fibrations around multiple fibers
Creators: name: Larson, Kyle
Publisher: name: arXiv
Year: 2014
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Given some type of fibration on a 4-manifold $X$ with a torus regular fiber $T$, we may produce a new 4-manifold $X_T$ by performing torus surgery on $T$. There is a natural way to extend the fibration to $X_T$, but a multiple fiber (non-generic) singularity is introduced. We construct explicit generic fibrations (with only indefinite fold singularities) in a neighborhood of this multiple fiber. As an application this gives explicit constructions of broken Lefschetz fibrations on all elliptic surfaces (e.g. the family $E(n)_{p,q}$). As part of the construction we produce generic fibrations around exceptional fibers of Seifert fibered spaces.
description: 12 pages, 6 figures. Corrected typos and made minor revisions
Chiral anomalies in black hole spacetimes
Creators: name: Frolov, Valeri P.
name: Koek, Alex
name: Soto, Jose Pinedo
name: Zelnikov, Andrei
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the properties of chiral anomalies in a wide class of spacetimes which possess a principal Killing-Yano tensor. This class includes metrics of charged rotating black holes as a special physically important case. The spacetimes which admit a principal Killing-Yano tensor possess a number of remarkable properties. In particular, such spacetimes have two commuting Killing vectors and a Killing tensor responsible for their hidden symmetries. We calculate the gravitational and electromagnetic contributions to the axial anomaly currents in the spacetime of a charged rotating black hole, and demonstrate that the equation for the chiral anomaly current has special solutions which respect both explicit and hidden symmetries. Two of these solutions have the form of currents propagating along two principal null directions, which are null eigenvectors of the Riemann tensor. These solutions describe chiral currents for the incoming and outgoing polarization fluxes. It is demonstrated that these principal chiral currents can be written explicitly in the form which contains the off-shell metric coefficients and their derivatives. We discuss conditions where the principle chiral anomaly current is regular at the horizon and the axes of symmetry. We demonstrate that for states where the current vanishes at the past horizon and at the past null infinity, there exist chirality fluxes at both the future horizon and future infinity. The latter is directly related to the polarization asymmetry of Hawking radiation for massless spinning particles. We also calculate the Chern-Simons currents for both gravitational and electromagnetic chiral anomalies in the black hole spacetime, and discuss the properties of the chirality fluxes associated with these currents.
description: 20 pages, 9 figures, references added
Identify 46 New Open Clusters Candidates In Gaia EDR3 Using pyUPMASK and Random Forest Hybrid Method
Creators: name: Chi, Huanbin
name: Wei, Shoulin
name: Wang, Feng
name: Li, Zhongmu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Open clusters (OCs) are regarded as tracers to understand stellar evolution theory and validate stellar models. In this study, we presented a robust approach to identifying OCs. A hybrid method of pyUPMASK and RF is first used to remove field stars and determine more reliable members. An identification model based on the RF algorithm built based on 3714 OC samples from Gaia DR2 and EDR3 is then applied to identify OC candidates. The OC candidates are obtained after isochrone fitting, the advanced stellar population synthesis (ASPS) model fitting, and visual inspection. Using the proposed approach, we revisited 868 candidates and preliminarily clustered them by the friends-of-friends algorithm in Gaia EDR3. Excluding the open clusters that have already been reported, we focused on the remaining 300 unknown candidates. From high to low fitting quality, these unrevealed candidates were further classified into Class A (59), Class B (21), and Class C (220), respectively. As a result, 46 new reliable open cluster candidates among classes A and B are identified after visual inspection.
description: 16 Pages, 14 figures, 4 tables, accepted by APJs
title: Framing von Terrorismus in der österreichischen Medienberichterstattung
Creators: name: Dessouki, Jasmin
Year: 2023

description: Die vorliegende Masterarbeit trägt den Titel „Framing von Terrorismus in der österreichischen Medienberichterstattung: Eine quantitative Inhaltsanalyse am Beispiel des Terroranschlags in Wien am 02. November 2020“. Sie behandelt die erstmalige Untersuchung der Berichterstattungen über den von dem IS organisierten Terroranschlag in Wien. Basierend auf dem theoretischen Rahmen des Framing-Ansatzes verfolgt sie das Ziel, die zentrale Forschungsfrage zu beantworten, ob und welche Framing-Muster in den Berichterstattungen der beiden Tageszeitungen erkennbar sind. Zu Untersuchungen der zentralen Forschungsfrage werden insgesamt 209 Artikel aus insgesamt 2 österreichischen Tageszeitungen für die Analyse herangezogen. Eine Tageszeitung namens „der Standard“ ist hier als Qualitätsmedium kategorisiert, während „die Kronenzeitung“ hier als Boulevardmedium eingestuft wurde. Die anfängliche Annahme lautete, dass das Boulevardmedium in seiner Berichterstattung generell, in Vergleich zum „Standard“, unterschiedliche Frames verwendet. Bei der Analyse der Berichterstattung über den Terroranschlag in Wien 2020 lassen sich deutliche Unterschiede in den verwendeten Medien-Frames feststellen. Im Verlauf des Untersuchungszeitraums wird offensichtlich, dass sich die thematischen Schwerpunkte bzw. Frames in den Berichterstattungen veränderten. Anfangs waren die Reaktionen auf den Anschlag und die Darstellung des Terrorismus als Bedrohung dominant präsent, jedoch änderte sich dies im Laufe der Zeit. Ebenso wurde der Frame „Konsequenzen und Maßnahmen des Terroranschlags“ direkt nach dem Ereignis in beiden Tageszeitungen verstärkt behandelt. Anschließend fokussierte sich die Berichterstattung verstärkt auf „die Strafverfolgung von Mitverdächtigten“ sowie auf „aufgedeckte Defizite im Strafverfolgungssystem“. Diese Entwicklungen veranschaulichen erneut, wie sich die in der Berichterstattung betonten Schwerpunkte im Laufe des Untersuchungszeitraums verschoben haben und sich auf verschiedene Aspekte des Terroranschlags und seiner Auswirkungen konzentriert haben. Signifikante Unterschiede in den Medien-Frames der beiden untersuchten Tageszeitungen fallen hierbei jedoch gering aus. Betrachtet man die Ausrichtung der Artikel, wird deutlich, dass das Boulevardblatt im Vergleich zum „der Standard“ verstärkt eine opferorientierte Perspektive einnimmt und somit vermehrt Zitate von Opfern in seine Berichterstattung einfließen lässt. Ein klare Schlussfolgerung bezüglich der Beurteilung der Darstellung des Islams und der Muslime in der Gesamtheit der analysierten Artikel lässt sich hierbei jedoch nicht eindeutig feststellen.
A Fast Algorithm for Sampling from the Posterior of a von Mises distribution
Creators: name: Forbes, Peter G. M.
name: Mardia, Kanti V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences
subject: I.6
subject: 62F15

description: Motivated by molecular biology, there has been an upsurge of research activities in directional statistics in general and its Bayesian aspect in particular. The central distribution for the circular case is von Mises distribution which has two parameters (mean and concentration) akin to the univariate normal distribution. However, there has been a challenge to sample efficiently from the posterior distribution of the concentration parameter. We describe a novel, highly efficient algorithm to sample from the posterior distribution and fill this long-standing gap.
Circle packing in regular polygons
Creators: name: Amore, Paolo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Geometry (cs.CG)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We study the packing of a large number of congruent and non--overlapping circles inside a regular polygon. We have devised efficient algorithms that allow one to generate configurations of $N$ densely packed circles inside a regular polygon and we have carried out intensive numerical experiments spanning several polygons (the largest number of sides considered here being $16$) and up to $200$ circles ($400$ circles in the special cases of the equilateral triangle and the regular hexagon) . Some of the configurations that we have found possibly are not global maxima of the packing fraction, particularly for $N \gg 1$, due to the great computational complexity of the problem, but nonetheless they should provide good lower bounds for the packing fraction at a given $N$. This is the first systematic numerical study of packing in regular polygons, which previously had only been carried out for the equilateral triangle, the square and the circle.
description: 38 pages, 20 figures
Thin-shell wormholes from the regular Hayward black hole
Creators: name: Halilsoy, M.
name: Ovgun, A.
name: Mazharimousavi, S. Habib
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit the regular black hole found by Hayward in $4-$dimensional static, spherically symmetric spacetime. To find a possible source for such a spacetime we resort to the non-linear electrodynamics in general relativity. It is found that a magnetic field within this context gives rise to the regular Hayward black hole. By employing such a regular black hole we construct a thin-shell wormhole for the case of various equations of state on the shell. We abbreviate a general equation of state by $p=ψ\left( σ\right) $ where $p$ is the surface pressure which is the function of the mass density ($σ$). In particular, a linear, logarithmic, Chaplygin, etc. forms of equations of state are considered. In each case we study the stability of the thin-shell against linear perturbations. We plot the stability regions by tuning the parameters of the theory. It is observed that the role of the Hayward parameter is to make the TSW more stable. Perturbations of the throat with small velocity condition is also studied. The matter of our TSWs, however, remains to be exotic.
description: 7 pages 5 figures, extended version
Axino dark matter in light of an anomalous X-ray line
Creators: name: Liew, Seng Pei
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Axino as the superpartner of axion that solves the strong CP problem can be a good candidate of dark matter. Inspired by the 3.5 keV X-ray line signal found to be originated from galaxy clusters and Andromeda galaxy, we study axino models with R-parity violations, and point out that axino dark matter with trilinear R-parity violations is an attractive scenario that reproduces the X-ray line. The Peccei-Quinn scale is required to be $f_a \sim{\cal O}(10^{9}-10^{11})$ GeV for trilinear R-parity violating couplings $λ\sim {\cal O} (10^{-3}-10^{-1})$ in order to explain the line signal. Moreover, the right-handed stau is predicted to be light, i.e. $\sim{\cal O}(100)$ GeV, and thus can be looked for at the LHC. Cosmological aspects of the model are also discussed in this study.
description: 13 pages, 1 figure. Added discussions, including the BICEP2 result. Published version
Chiral critical behavior of 3D lattice fermionic models with quartic interactions
Creators: name: Bonati, Claudio
name: Franchi, Alessio
name: Pelissetto, Andrea
name: Vicari, Ettore
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the critical behavior of the three-dimensional (3D) Gross-Neveu (GN) model with $N_f$ Dirac fermionic flavors and quartic interactions, at the chiral ${\mathbb Z}_2$ transition in the massless ${\mathbb Z}_2$-symmetric limit. For this purpose, we consider a lattice GN model with staggered Kogut-Susskind fermions and a scalar field coupled to the scalar bilinear fermionic operator, which effectively realizes the attractive four-fermion interaction. We perform Monte Carlo (MC) simulations for $N_f=4,8,12,16$. By means of finite-size scaling analyses of the numerical data, we obtain estimates of the critical exponents that are compared with the large-$N_f$ predictions obtained using the continuum GN field theory. We observe a substantial agreement. This confirms that lattice GN models with staggered fermions provide a nonpertubative realization of the GN quantum field theory, even though the lattice interactions explicitly break the flavor ${\rm U}(N_f)\otimes {\rm U}(N_f)$ symmetry of the GN field theory, which is only recovered in the critical limit.
description: 11 pages
Evolution of Reddit: From the Front Page of the Internet to a Self-referential Community?
Creators: name: Singer, Philipp
name: Flöck, Fabian
name: Meinhart, Clemens
name: Zeitfogel, Elias
name: Strohmaier, Markus
Publisher: name: arXiv
Year: 2014
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
subject: H.3.5

description: In the past few years, Reddit -- a community-driven platform for submitting, commenting and rating links and text posts -- has grown exponentially, from a small community of users into one of the largest online communities on the Web. To the best of our knowledge, this work represents the most comprehensive longitudinal study of Reddit's evolution to date, studying both (i) how user submissions have evolved over time and (ii) how the community's allocation of attention and its perception of submissions have changed over 5 years based on an analysis of almost 60 million submissions. Our work reveals an ever-increasing diversification of topics accompanied by a simultaneous concentration towards a few selected domains both in terms of posted submissions as well as perception and attention. By and large, our investigations suggest that Reddit has transformed itself from a dedicated gateway to the Web to an increasingly self-referential community that focuses on and reinforces its own user-generated image- and textual content over external sources.
description: Published in the proceedings of WWW'14 companion
Three dimensional regular black string via loop corrections
Creators: name: Ying, Shuxuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is well known that some spacetime singularities of low energy effective action can be resolved by the effective loop corrections. However, the known potentials for the loop corrections fail to regulate the singularity of three dimensional black string. An alternative method is to introduce an extra flat spatial direction and boost away the singularity by using the $O\left(d,d\right)$ rotation with the special Kalb-Ramond field. In this paper, we investigate a new set of non-local dilaton potentials for the effective loop corrections. The result shows that the singularity of three dimensional black string can be consistently resolved by the loop corrections.
description: V2: 12 pages, 6 figures, typos corrected, version to appear in JHEP
Dynamics of mode entanglement in a system of cavities coupled with a chiral mirror
Creators: name: Hardal, Ali Ü. C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the Hermitian and the non-Hermitian dynamics of the mode entanglement in two identical optical cavities coupled by a chiral mirror. By employing the non-Hermitian quantum evolution, we calculate the logarithmic negativity measure of entanglement for initially Fock, coherent and squeezed states, separately. We verify the non-conservation of mean spin for the initially coherent and squeezed states when the coupling is non-reciprocal and report the associated spin noise for each case. We examine the effects of non-conserved symmetries on the mode correlations and determine the degree of non-reciprocal coupling to establish robust quantum entanglement.
description: 6 pages and 4 figures, revised version, to be appear in JOSAB
Gaia search for early-formed andesitic asteroidal crusts
Creators: name: Galinier, Marjorie
name: Delbo, Marco
name: Avdellidou, Chrysa
name: Galluccio, Laurent
name: Marrocchi, Yves
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Context. Andesitic meteorites are among the oldest achondrites known to date. They record volcanic events and crust formation episodes in primordial planetesimals that took place about 4.565 Myr ago. However, no analogue for these meteorites has been found in the asteroid population to date. Aims. We searched for spectroscopic analogues of the andesitic meteorite Erg Chech 002 in the asteroid population using the Gaia DR3 spectral dataset. Methods. In order to identify which asteroids have the most similar spectrum to Erg Chech 002, we first determined the spectral parameters of Gaia DR3 asteroids (spectral slope and Band I depth) and compared them to the spectral parameters of different samples of the meteorite. In addition, we performed a spectral curve matching between Erg Chech 002 and Gaia DR3 asteroid data, and we compared the results of both methods. Results. We found that 51 main-belt asteroids have a visible spectrum similar to the one of Erg Chech 002, and 91 have a spectrum similar to the space-weathered spectra of the meteorite, corresponding to 0.08 and 0.15% of the whole Gaia DR3 dataset of asteroids with spectra, respectively. The asteroids that best match the laboratory samples of the meteorite are mostly located in the inner main belt, while the objects matching the space-weathered meteorite models show slightly more scattering across the belt. Conclusions. Despite the fact that we find asteroids that potentially match Erg Chech 002, these asteroids are extremely rare. Moreover, a visible spectrum alone is not completely diagnostic of an Erg Chech 002-like composition. Near-infrared spectra will be important to confirm (or rule out) the spectral matches between Erg Chech 002 and the candidate asteroid population.
title: Seismic Networks
Creators: name: Havskov, Jens
name: Ottemöller, Lars
name: Trnkoczy, Amadej
name: Bormann, Peter
Publisher: name: Deutsches GeoForschungsZentrum GFZ
Year: 2012
Subjects: Seismology

description: New Manual of Seismological Observatory Practice 2 (NMSOP2)