cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Morphology driven evolution of barred galaxies in OMEGAWINGS Clusters
Creators: name: Tawfeek, Amira A.
name: Sodi, Bernardo Cervantes
name: Fritz, Jacopo
name: Moretti, Alessia
name: Pérez-Millán, David
name: Gullieuszik, Marco
name: Poggianti, Bianca M.
name: Vulcani, Benedetta
name: Bettoni, Daniela
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a study of barred galaxies in the cluster environment, exploiting a sample of galaxies drawn from the extended WIde-field Nearby Galaxy-cluster Survey (OmegaWINGS) that covers up to the outer regions of 32 local X-ray selected clusters. Barred galaxies are identified through a semi-automatic analysis of ellipticity and position angle profiles. We find, in agreement with previous studies, a strong co-dependence of the bar fraction with the galaxy stellar mass and morphological type, being maximum for massive late-type galaxies. The fraction of barred galaxies decreases with increasing cluster mass and with decreasing clustercentric distance, a dependence that vanishes once we control for morphological type, which indicates that the likelihood of a galaxy hosting a bar in the cluster environment is determined by its morphological transformation. At large clustercentric distances, we detect a dependence on the distance to the nearest neighbor galaxy, suggesting that tidal forces with close companions are able to suppress the formation of bars or even destroy them. Barred galaxies in our sample are either early-type, star forming galaxies located within the virial radii of the clusters or late-type quenched galaxies found beyond the virial radii of the clusters. We propose a scenario in which already quenched barred galaxies that fall into the clusters are centrally rejuvenated by the interplay of the perturbed gas by ram-pressure and the bar, in galaxies that are undergoing a morphological transformation.
description: 17 pages,9 figures, 1 table, accepted in ApJ
CESM source files for PK02 with additional sensitivity test
Creators: name: Park, Joonsung
Publisher: name: Zenodo
Year: 2022

description: This upload has modified source code for temperature relaxation, surface drag, sponge layer configuration in Polvani & Kushner (2002) (tphysidl.F90). In addition, source codes for polar filter sensitivity test (dynamic_vars.F90), divergence damping (cd_core.F90) are uploaded. Polvani, L. M., & Kushner, P. J. (2002). Tropospheric response to stratospheric perturbations in a relatively simple general circulation model. Geophysical Research Letters, 29(7), 18-1-18–4. https://doi.org/10.1029/2001GL014284
Completeness of first and second order ODE flows and of Euler-Lagrange equations
Creators: name: Minguzzi, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Two results on the completeness of maximal solutions to first and second order ordinary differential equations (or inclusions) over complete Riemannian manifolds, with possibly time-dependent metrics, are obtained. Applications to Lagrangian mechanics and gravitational waves are given.
description: 17 pages. v2: a few typos have been fixed
title: Fischfang zur Zeit der Neolithisierung an der südwestlichen Ostseeküste
Creators: name: Klooß, Stefanie
Publisher: name: University Library Heidelberg
Year: 2014

description: Die hier vorgestellte Dissertation befasst sich mit Holzartefakten von endmesolithischen und frühneolithischen Küstensiedlungsplätzen an der südwestlichen Ostseeküste. In diesem Artikel werden die Geräte zum aktiven und passiven Fischfang präsentiert, um die Bedeutung des Fischfangs für die Subsistenz der Menschen während der Phase der Neolithisierung im Verbreitungsgebiet der der Ertebølle-Gruppen und der nördlichen Trichterbecherkultur zu belegen. Die Untersuchung der Aalstecher, Reusen, Fischzäune, Einbäume und Paddel ermöglicht Schlussfolgerungen über deren Herstellungs- und Funktionsweise sowie deren typische Charakteristika. Insbesondere wird die bisher nur in der Ertebøllezeit nachgewiesene Bauweise der Korbreusen aus Spaltstäben des Roten Hartriegels (Cornus sanguinea) und des Schneeballstrauches (Viburnum opulus) vorgestellt. Die Ergebnisse der dendrologischen Analysen zeigen darüber hinaus den damaligen hohen technischen und handwerklichen Standard. Weiterhin können die gezielte Produktion von Holzrohstoffen und damit kleinteilige Eingriffe in die Waldvegetation nachgewiesen werden. Die intensive Nutzung der stationären Fischfanganlagen impliziert das Zusammenwirken einer größeren Gruppe von Menschen und eine stabile soziale Ordnung. Mit dem Beginn des Frühneolithikums (FN I a) ist noch keine deutliche Veränderung des Siedlungssystems oder der Subsistenzwirtschaft zu erkennen.
description: Subject of the here presented dissertation thesis are wooden artefacts from terminal Mesolithic and early Neolithic coastal settlement sites at the south-western Baltic sea. In this article tools for active and passive fishing are presented to emphasize the importance of fishing for human subsistence during the phase of neolithisation in the area of Ertebølle and northern Funnel Beaker groups. The investigation of eel leisters, fish trap baskets, fish weirs, dugouts and paddles allows conclusions about their building and operation modes as well as about their typical characteristics. Especially the building mode of fish trap baskets out of split parallel woods of red dogwood (Cornus sanguinea) and guilder rose (Viburnum opulus) is presented, which was up to now only found in the Ertebølle period. Moreover the results of dendrological analysis show the high technical standard and sophisticated woodworking skills in the past. Furthermore the specific production of wooden resources and therefore small-sized changes of the woodland structure could be proven. The intensive use of stationary fishing structures implies the cooperation of a larger group of humans and a stable social system. At the beginning of early Neolithic (EN I a) no substantial change of economic or settlement system can be seen.
Nonequivalence of equivalence principles
Creators: name: Di Casola, Eolo
name: Liberati, Stefano
name: Sonego, Sebastiano
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Equivalence principles played a central role in the development of general relativity. Furthermore, they have provided operative procedures for testing the validity of general relativity, or constraining competing theories of gravitation. This has led to a flourishing of different, and inequivalent, formulations of these principles, with the undesired consequence that often the same name, "equivalence principle", is associated with statements having a quite different physical meaning. In this paper we provide a precise formulation of the several incarnations of the equivalence principle, clarifying their uses and reciprocal relations. We also discuss their possible role as selecting principles in the design and classification of viable theories of gravitation.
description: 11 pages, no figures
Direct Determination of the Activation Energy for Diffusion of OH Radicals on Water Ice
Creators: name: Miyazaki, A.
name: Tsuge, M.
name: Hidaka, H.
name: Nakai, Y.
name: Watanabe, N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using a combination of photostimulated desorption and resonance-enhanced multiphoton ionization methods, the behaviors of OH radicals on the surface of interstellar ice analog was monitored at temperatures between 54 and 80 K. The OH number density on the surface of ultraviolet (UV)-irradiated compact amorphous solid water gradually decreased at temperatures above 60 K. Analyzing the temperature dependence of OH intensities with the Arrhenius equation, the decrease can be explained by recombination of two OH radicals, which is rate-limited by thermal diffusion of OH. The activation energy for surface diffusion was experimentally determined for the first time to be 0.14 +/- 0.01 eV, which is larger than or equivalent to those assumed in theoretical models. This value implies that the diffusive reaction of OH radicals starts to be activated at approximately 36 K on interstellar ice.
description: 5 figures, Accepted to ApJL
Point transitivity, $Δ$-transitivity and multi-minimality
Creators: name: Chen, Zhijing
name: Li, Jian
name: Lü, Jie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 54H20, 37B40, 58K15, 37B45

description: Let $(X, f)$ be a topological dynamical system and $\mathcal {F}$ be a Furstenberg family (a collection of subsets of $\mathbb{N}$ with hereditary upward property). A point $x\in X$ is called an $\mathcal {F}$-transitive point if for every non-empty open subset $U$ of $X$ the entering time set of $x$ into $U$, $\{n\in \mathbb{N}: f^{n}(x) \in U\}$, is in $\mathcal {F}$; the system $(X,f)$ is called $\mathcal {F}$-point transitive if there exists some $\mathcal {F}$-transitive point. In this paper, we first discuss the connection between $\mathcal {F}$-point transitivity and $\mathcal {F}$-transitivity, and show that weakly mixing and strongly mixing systems can be characterized by $\mathcal {F}$-point transitivity, completing results in [Transitive points via Furstenberg family, Topology Appl. 158 (2011), 2221--2231]. We also show that multi-transitivity, $Δ$-transitivity and multi-minimality can also be characterized by $\mathcal {F}$-point transitivity, answering two questions proposed by Kwietniak and Oprocha [On weak mixing, minimality and weak disjointness of all iterates, Erg. Th. Dynam. Syst., 32 (2012), 1661--1672].
description: 19 pages, the final version. Change the title to "Point transitivity, $\Delta$-transitivity and multi-minimality"
Periodic solutions of coupled Boussinesq equations and Ostrovsky-type models free from zero-mass contradiction
Creators: name: Khusnutdinova, K. R.
name: Tranter, M. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Coupled Boussinesq equations describe long weakly-nonlinear longitudinal strain waves in a bi-layer with a soft bonding between the layers (e.g. a soft adhesive). From the mathematical viewpoint, a particularly difficult case appears when the linear long-wave speeds in the layers are significantly different (high-contrast case). The traditional derivation of the uni-directional models leads to four uncoupled Ostrovsky equations, for the right- and left-propagating waves in each layer. However, the models impose a ``zero-mass constraint'' i.e. the initial conditions should necessarily have zero mean, restricting the applicability of that description. Here, we bypass the contradiction in this high-contrast case by constructing the solution for the deviation from the evolving mean value, using asymptotic multiple-scale expansions involving two pairs of fast characteristic variables and two slow-time variables. By construction, the Ostrovsky equations emerging within the scope of this derivation are solved for initial conditions with zero mean while initial conditions for the original system may have non-zero mean values. Asymptotic validity of the solution is carefully examined numerically. We apply the models to the description of counter-propagating waves generated by solitary wave initial conditions, or co-propagating waves generated by cnoidal wave initial conditions, as well as the resulting wave interactions, and contrast with the behaviour of the waves in bi-layers when the linear long-wave speeds in the layers are close (low-contrast case). One local (classical) and two non-local (generalised) conservation laws of the coupled Boussinesq equations for strains are derived, and these are used to control the accuracy of the numerical simulations.
description: This work was intended as a replacement of arXiv:2102.03090 and any subsequent updates will appear there
Spectral sets and distinguished varieties in the symmetrized bidisc
Creators: name: Pal, Sourav
name: Shalit, Orr
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 47A13, 47A20, 47A25, 47A45

description: We show that for every pair of matrices (S,P), having the closed symmetrized bidisc $Γ$ as a spectral set, there is a one dimensional complex algebraic variety $Λ$ in $Γ$ such that for every matrix valued polynomial f, the norm of f(S,P) is less then the sup norm of f on $Λ$. The variety $Λ$ is shown to have a particular determinantal representation, related to the so-called "fundamental operator" of the pair (S,P). When (S,P) is a strict $Γ$-contraction, then $Λ$ is a distinguished variety in the symmetrized bidisc, i.e., a one dimensional algebraic variety that exits the symmetrized bidisc through its distinguished boundary. We characterize all distinguished varieties of the symmetrized bidisc by a determinantal representation as above.
description: 18 pages. Slightly revised
Observation of magnetic field generation via the Weibel instability in interpenetrating plasma flows
Creators: name: Huntington, C. M.
name: Fiuza, F.
name: Ross, J. S.
name: Zylstra, A. B.
name: Drake, R. P.
name: Froula, D. H.
name: Gregori, G.
name: Kugland, N. L.
name: Kuranz, C. C.
name: Levy, M. C.
name: Li, C. K.
name: Meinecke, J.
name: Morita, T.
name: Petrasso, R.
name: Plechaty, C.
name: Remington, B. A.
name: Ryutov, D. D.
name: Sakawa, Y.
name: Spitkovsky, A.
name: Takabe, H.
name: Park, H. -S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Collisionless shocks can be produced as a result of strong magnetic fields in a plasma flow, and therefore are common in many astrophysical systems. The Weibel instability is one candidate mechanism for the generation of sufficiently strong fields to create a collisionless shock. Despite their crucial role in astrophysical systems, observation of the magnetic fields produced by Weibel instabilities in experiments has been challenging. Using a proton probe to directly image electromagnetic fields, we present evidence of Weibel-generated magnetic fields that grow in opposing, initially unmagnetized plasma flows from laser-driven laboratory experiments. Three-dimensional particle-in-cell simulations reveal that the instability efficiently extracts energy from the plasma flows, and that the self-generated magnetic energy reaches a few percent of the total energy in the system. This result demonstrates an experimental platform suitable for the investigation of a wide range of astrophysical phenomena, including collisionless shock formation in supernova remnants, large-scale magnetic field amplification, and the radiation signature from gamma-ray bursts.
A Search for Predicted Astrometric Microlensing Events by Nearby Brown Dwarfs
Creators: name: Luberto, Judah
name: Martin, Emily C.
name: McGill, Peter
name: Leauthaud, Alexie
name: Skemer, Andrew J.
name: Lu, Jessica R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Gravitational microlensing has the potential to provide direct gravitational masses of single, free-floating brown dwarfs, independent of evolutionary and atmospheric models. The proper motions and parallaxes of nearby brown dwarfs can be used to predict close future alignments with distant background stars that cause a microlensing event. Targeted astrometric follow up of the predicted microlensing events permits the brown dwarf's mass to be measured. Predicted microlensing events are typically found via searching for a peak threshold signal using an estimate of the lens mass. We develop a novel method that finds predicted events that instead will lead to a target lens mass precision. The main advantage of our method is that it does not require a lens mass estimate. We use this method to search for predicted astrometric microlensing events occurring between 2014 - 2032 using a catalog of 1225 low mass star and brown dwarf lenses in the Solar Neighborhood of spectral type M6 or later and a background source catalog from DECaLS Data Release 9. The background source catalog extends to $g = $ 23.95, providing a more dense catalog compared to Gaia. Our search did not reveal any upcoming microlensing events. We estimate the rate of astrometric microlensing event for brown dwarfs in the Legacy Survey and find it to be low $\sim10^{-5}$yr$^{-1}$. We recommend carrying out targeted searches for brown dwarfs in front of the Galactic Bulge and Plane to find astrometric microlensing events that will allow the masses of single, free-floating brown dwarfs to be measured.
description: 12 pages, 6 figures, Accepted to AJ
Exploring sensitivity of charge-exchange ($p, n$) reactions to the neutron density distribution
Creators: name: Liu, Jian
name: Wang, Yunsheng
name: Gao, Yonghao
name: Danielewicz, Pawel
name: Xu, Chang
name: Ren, Zhongzhou
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: $Background:$ The determination of the nuclear neutron properties suffers from uncontrolled uncertainties, which attracted considerable attention recently, such as in the context of the PREX experiment. $Purpose:$ Our aim is to analyze the sensitivity of charge-exchange ($p, n$) reactions to the neutron density distribution $ρ_{n}$ and constrain the neutron characteristics in the nuclear structure models. $Method:$ By combing the folding and the mean-field models, the nucleon-nucleus ($NA$) potential can be obtained from the nuclear density distribution. Further, the ($p, p$) and ($p, n$) cross sections for $^{48}$Ca and $^{208}$Pb are calculated following the distorted-wave Born approximation (DWBA) method. $Results:$ Compared with the ($p, p$) cross section, the effects of $ρ_{n}$ variation on the ($p, n$) cross section are significant, which is due to the impact of isovector properties. Based on the global folding model analyses of data, it is found that $^{48}$Ca and $^{208}$Pb have relatively large neutron skin thickness $ΔR_{n p}$. $Conclusions:$ Results illustrate that the charge-exchange ($p, n$) reaction is a sensitive probe of $ρ_{n}$. The results in this paper can offer useful guides for future experiments of neutron characteristics.
The Liouville property for groups acting on rooted trees
Creators: name: Amir, Gideon
name: Angel, Omer
name: Bon, Nicolás Matte
name: Virág, Bálint
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: We show that on groups generated by bounded activity automata, every symmetric, finitely supported probability measure has the Liouville property. More generally we show this for every group of automorphisms of bounded type of a rooted tree. For automaton groups, we also give a uniform upper bound for the entropy of convolutions of every symmetric, finitely supported measure.
description: Major changes in the statement and proof of Theorem 1, it now holds for all groups of automorphisms of bounded type, not necessarily finite-state. Final version, to appear in Annales de l'IHP
Information Shift Dynamics Described by Tsallis $q=3$ Entropy on a Compact Phase Space
Creators: name: Yan, Jin
name: Beck, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Recent mathematical investigations have shown that under very general conditions exponential mixing implies the Bernoulli property. As a concrete example of a statistical mechanics which is exponentially mixing we consider a Bernoulli shift dynamics by Chebyshev maps of arbitrary order $N\geq 2$, which maximizes Tsallis $q=3$ entropy rather than the ordinary $q=1$ Boltzmann-Gibbs entropy. Such an information shift dynamics may be relevant in a pre-universe before ordinary space-time is created. We discuss symmetry properties of the coupled Chebyshev systems, which are different for even and odd $N$. We show that the value of the fine structure constant $α_{el}=1/137$ is distinguished as a coupling constant in this context, leading to uncorrelated behaviour in the spatial direction of the corresponding coupled map lattice for $N=3$.
description: Expanded version; to appear in Entropy
title: Jiří Macháček/Šimon Ungerman (Hrsg.): Frühgeschichtliche Zentralorte in Mitteleuropa (Studien zur Archäologie Europas 14). Bonn 2011.
Creators: name: Werther, Lukas
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Jiří Macháček/Šimon Ungerman (Hrsg.): Frühgeschichtliche Zentralorte in Mitteleuropa (Studien zur Archäologie Europas 14). Bonn: Habelt 2011. 690 Seiten, mit zahlreichen Abbildungen, Beiträge in deutsch und englisch, ISBN 978-3-7749-3730-7
title: Pflederer, Tobias/Sommer, C. Sebastian (Hrsg.): Archäologie der Brücken. Vorgeschichte, Antike, Mittelalter, Neuzeit (Archaeology of Bridges. Prehistory, Antiquity, Middle Ages, Modern Era). Regensburg 2011.
Creators: name: Untermann, Matthias
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Pflederer, Tobias/Sommer, C. Sebastian (Hrsg.): Archäologie der Brücken. Vorgeschichte, Antike, Mittelalter, Neuzeit (Archaeology of Bridges. Prehistory, Antiquity, Middle Ages, Modern Era). Regensburg: Verlag Friedrich Pustet 2011. ISBN 978-3-7917-2331-0
title: Susanne Klemm: Straßen für den Steirischen Erzberg, Archäologisch-historische Altstraßenforschung in der Steiermark, 16.–18. Jahrhundert (Forschungen zur geschichtlichen Landeskunde der Steiermark 52). Wien/Berlin 2011
Creators: name: Untermann, Matthias
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Susanne Klemm: Straßen für den Steirischen Erzberg, Archäologisch-historische Altstraßenforschung in der Steiermark, 16.–18. Jahrhundert (Forschungen zur geschichtlichen Landeskunde der Steiermark 52). Wien/Berlin 2011. 267 S. ISBN 978-3-643-50202-5
The future of short-range high-speed data transmission: Printed polymer optical waveguides (POW) innovation, fabrication, and challenges
Creators: name: Reitberger, T.
name: Stoll, T.
name: Hoffmann, G.-A.
name: Lorenz, L.
name: Neermann, S.
name: Overmeyer, L.
name: Bock, K.-H.
name: Wolter, K.-J.
name: Franke, J.
Publisher: name: Bellingham, Wash. : SPIE
Year: 2018
Subjects: subject: Additive
subject: Aerosol
subject: Digitalization
subject: Manufacturing
subject: Optic
subject: Polymer
subject: Printing
subject: Waveguide
subject: Additives
subject: Aerosols
subject: Audition
subject: Copper
subject: Data transfer
subject: Fabrication
subject: Manufacture
subject: Optical waveguides
subject: Optics
subject: Polymers
subject: Waveguides
subject: High-speed data transmission
subject: Industrial environments
subject: Polymer optical waveguide
subject: Short range applications
subject: Technological development
subject: Three-dimensional surface
subject: Wireless transmissions
subject: Light transmission
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: One of today's megatrends in the industrial environment is additive manufacturing. Faster prototyping, customized products like hearing devices, integrated functions like heatsinks and many other opportunities are offered by this technological development. The opportunity of using different materials and build up 3-D structures is virtually infinite. Another one is the digitalization of almost any product to build up a smart world. This trend leads to a tremendously rising amount of data to be transferred from one place to another. If a wireless transmission is not possible and if the distance is over 100 m glass fiber is the fastest and most secure way for these requirements. In case of most short-range applications up to 100 m primary copper cables or circuit paths are in use because the electrical data transfer is well known. The limited bandwidth of copper asks for new inventions to meet the demands of tomorrow. Regarding both megatrends, the solution for this upcoming bottleneck could be 3-D printed photonic packages. This paper shows a new and innovative way for the customized fabricating of short-range data transmission networks. By Aerosol Jet Printing (AJP) the so called polymer optical waveguides (POW), it is possible to build up 3-D printed light guiding structures with low attenuation on almost any three-dimensional surface. The main advantages of the here presented research are high flexibility, low weight and low costs. After three years of intensive studies the most important key facts (machine settings, geometry, performance) are summarized in this publication. © 2018 SPIE.
Nonequilibrium dynamical cluster theory
Creators: name: Tsuji, Naoto
name: Barmettler, Peter
name: Aoki, Hideo
name: Werner, Philipp
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the effect of spatially nonlocal correlations on the nonequilibrium dynamics of interacting fermions by constructing the nonequilibrium dynamical cluster theory, a cluster generalization of the nonequilibrium dynamical mean-field theory (DMFT). The formalism is applied to interaction quenches in the Hubbard model in one and two dimensions, and the results are compared with data from single-site DMFT, the time-dependent density matrix renormalization group, and lattice perturbation theory. Both in one and two dimensions the double occupancy quickly thermalizes, while the momentum distribution relaxes only on much longer time scales. For the two-dimensional square lattice we find a strongly momentum-dependent evolution of the momentum distribution around the Fermi energy, with a much faster relaxation near the momenta $(0,π)$ and $(π,0)$ than near $(π/2,π/2)$. This result is interpreted as reflecting the momentum-anisotropic quasiparticle lifetime of the marginal Fermi liquid. The method is further applied to the two-dimensional Hubbard model driven by a dc electric field, where the damping of the Bloch oscillation of the current is found to be less effective than predicted by DMFT and lattice perturbation theory.
Χρηματοοικονομική ανάλυση ενός οργανισμού - Μελέτη περίπτωσης Πλαστικά Θράκης
Creators: name: Μπάμης, Μιχαήλ
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Αριθμοδείκτες
subject: Ανάλυση
subject: Λογιστικές καταστάσεις
subject: Πλαστικά
subject: Πλαστικά Θράκης

description: Σκοπός της παρούσας Διπλωματικής Εργασίας αποτελεί η χρηματοοικονομική ανάλυσης ενός οργανισμού και συγκεκριμένα της εταιρείας Πλαστικά Θράκης, η οποία αποτελεί μία εκ των ηγετικών εταιρειών στον κλάδο παραγωγής πλαστικού στην Ελλάδα, έχοντας και αξιόλογη διεθνή παρουσία. Έπειτα από τη θεωρητική προσέγγιση του ζητήματος των αριθμοδεικτών, περιγράφεται αναλυτικά ο υπό εξέταση Όμιλος. Στο δεύτερο σκέλος της εργασίας λαμβάνει χώρα ανάλυση των χρηματοοικονομικών μεγεθών του Ομίλου, όπου μελετάται η οικονομική αξία και η επίδοση του Ομίλου, ενώ γίνεται εκτενής ανάλυση και σχολιασμός των αριθμοδεικτών, συγκρίνοντας τα αποτελέσματα του Ομίλου με τους υπόλοιπους ανταγωνιστές του. Για την χρηματοοικονομική ανάλυση αυτή χρησιμοποιούνται οι ισολογισμοί του Ομίλου, καθώς επίσης και οι καταστάσεις αποτελεσμάτων χρήσεων, ενώ μέσω των κατάλληλων αριθμοδεικτών που χρησιμοποιήθηκαν παρέχονται πληροφορίες για την οικονομική επίδοση του ομίλου, ενώ γίνεται σύγκριση των αντίστοιχων μεγεθών με τους κυριότερους ανταγωνιστές του Ομίλου. Από την έρευνα αυτή διαπιστώνεται ότι η υπό εξέταση εταιρεία κατάφερε και αντιμετώπισε με τρόπο αποτελεσματικό τις σύνθετες προκλήσεις που διαμορφώθηκαν, ενώ σχεδόν σε όλους τους αριθμοδείκτες παρουσιάζει καλύτερες επιδόσεις από την Δάιος Πλαστικά και χειρότερες από την Πλαστικά Κρήτης. Αναφορικά με τη μεθοδολογία που χρησιμοποιήθηκε, θα πρέπει να σημειωθεί ότι έγινε εκτενής χρήση επιστημονικών περιοδικών και αντίστοιχων συγγραμμάτων, τα οποία αφορούν την ανάλυση των λογιστικών καταστάσεων, καθώς και των αριθμοδεικτών. Ακόμη, χρησιμοποιήθηκαν εκθέσεις που αφορούν την ίδια την εταιρεία, καθώς και επικαιροποιημένες πληροφορίες από το διαδίκτυο. Στο δεύτερο σκέλος της εργασίας, χρησιμοποιήθηκε το εργαλείο excel, προκειμένου να υπολογιστούν οι αριθμοδείκτες και να διαμορφωθούν οι πίνακες και τα σχετικά διαγράμματα.
Quantum Subdivision Capacities and Continuous-time Quantum Coding
Creators: name: Müller-Hermes, Alexander
name: Reeb, David
name: Wolf, Michael M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Quantum memories can be regarded as quantum channels that transmit information through time without moving it through space. Aiming at a reliable storage of information we may thus not only encode at the beginning and decode at the end, but also intervene during the transmission - a possibility not captured by the ordinary capacities in Quantum Shannon Theory. In this work we introduce capacities that take this possibility into account and study them in particular for the transmission of quantum information via dynamical semigroups of Lindblad form. When the evolution is subdivided and supplemented by additional continuous semigroups acting on arbitrary block sizes, we show that the capacity of the ideal channel can be obtained in all cases. If the supplementary evolution is reversible, however, this is no longer the case. Upper and lower bounds for this scenario are proven. Finally, we provide a continuous coding scheme and simple examples showing that adding a purely dissipative term to a Liouvillian can sometimes increase the quantum capacity.
description: 28 pages plus 6 pages appendix, 6 figures
Quenching for a semi-linear wave equation for MEMS
Creators: name: Gimperlein, Heiko
name: He, Runan
name: Lacey, Andrew A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the formation of finite-time quenching singularities for solutions of semi-linear wave equations with negative power nonlinearities, as can model micro-electro-mechanical systems (MEMS). For radial initial data we obtain, formally, the existence of a sequence of quenching self-similar solutions. Also from formal asymptotic analysis, a solution to the PDE which is radially symmetric and increases strictly monotonically with distance from the origin quenches at the origin like an explicit spatially independent solution. The latter analysis and numerical experiments suggest a detailed conjecture for the singular behaviour.
description: 23 pages, 5 figures
Improving A*OMP: Theoretical and Empirical Analyses With a Novel Dynamic Cost Model
Creators: name: Karahanoglu, Nazim Burak
name: Erdogan, Hakan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Best-first search has been recently utilized for compressed sensing (CS) by the A* orthogonal matching pursuit (A*OMP) algorithm. In this work, we concentrate on theoretical and empirical analyses of A*OMP. We present a restricted isometry property (RIP) based general condition for exact recovery of sparse signals via A*OMP. In addition, we develop online guarantees which promise improved recovery performance with the residue-based termination instead of the sparsity-based one. We demonstrate the recovery capabilities of A*OMP with extensive recovery simulations using the adaptive-multiplicative (AMul) cost model, which effectively compensates for the path length differences in the search tree. The presented results, involving phase transitions for different nonzero element distributions as well as recovery rates and average error, reveal not only the superior recovery accuracy of A*OMP, but also the improvements with the residue-based termination and the AMul cost model. Comparison of the run times indicate the speed up by the AMul cost model. We also demonstrate a hybrid of OMP and A?OMP to accelerate the search further. Finally, we run A*OMP on a sparse image to illustrate its recovery performance for more realistic coefcient distributions.
Imaging and non-imaging illumination of a DLP for high resolution headlamps
Creators: name: Ley, Peer-Phillip
name: Lachmayer, Roland
Publisher: name: Bellingham, Wash. : SPIE
Year: 2019
Subjects: subject: High Resolution Headlamps
subject: DLP
subject: Imaging Illumination
subject: Non-Imaging Illumination
subject: LED
subject: Hochauflösende Fahrzeugscheinwerfer
subject: Abbildende Beleuchtung
subject: Nichtabbildende Beleuchtung
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Matrix-LED systems offer different functionalities to increase road safety, e.g. glare-free high beam and marking light. Shortly after their introduction, efforts have been made to increase the amount of pixels. One of the results is the EVIYOS LED consisting of 1024 individually controllable pixels, which practically set the stage for pixel light systems. Current efforts to implement high-resolution pixel light systems are focused towards the exploration of an efficient light source in combination with the use of spatial light modulators. One approach to implement high-resolution pixel light systems is the use of LED arrays as a light source to illuminate a DLP. Unlike video projectors which require a homogeneous illumination of the DLP in order to obtain a homogeneous projection, headlamps require an inhomogeneous light distribution with high illuminance in the center. In order to receive a high system efficiency preforming the desired illuminance onto the active area of the modulator is advantageous. To further increase the systems efficiency an imaging illumination of the DLP, where the images of the emission surfaces of the LEDs are superposed onto the active area of the DLP, is worthwhile. In this paper, concepts for imaging and non-imaging illumination strategies of a DLP for high resolution headlamps will be introduced. For both illumination strategies the most promising concept will be selected to set up an optical system to illuminate a DLP. The paper concludes with a comparative analysis of the imaging and non-imaging optical system with regards to the system architecture and system efficiency.
Homology of analogues of Heisenberg Lie algebras
Creators: name: Sam, Steven V
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 05E10, 17B30, 17B56

description: We calculate the homology of three families of 2-step nilpotent Lie (super)algebras associated with the symplectic, orthogonal, and general linear groups. The symplectic case was considered by Getzler and the main motivation for this work was to complete the calculations started by him. In all three cases, these algebras can be realized as the nilpotent radical of a parabolic subalgebra of a simple Lie algebra, and our first approach relies on a theorem of Kostant, but is otherwise elementary and involves combinatorics of Weyl groups and partitions which may be of independent interest. Our second approach is an application of (un)stable representation theory of the classical groups in the sense of recent joint work of the author with Snowden, which is shorter and more conceptual.
description: 13 pages; v2: small corrections and added Remark 1.6
title: Γεννητικά ανταγωνιστικά δίκτυα και εφαρμογές τους
title: Generative adversarial networks and their applications
titleType: AlternativeTitle
Creators: name: Γεροντόπουλος, Ιωάννης-Ουώλτερ
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Γεννητικά ανταγωνιστικά δίκτυα
Τεχνητή νοημοσύνη
Μηχανική μάθηση
Βαθιά μάθηση
Βαθιά νευρωνικά δίκτυα
Εκπαίδευση δεδομένων
GAN

description: Εισαγωγή στα Γεννητικά Ανταγωνιστικά Δίκτυα με μεθόδους βαθιών νευρωνικών δικτύων και άλλα εργαλεία της μηχανικής μάθησης, μαζί με επεξηγηματικά παραδείγματα.
Spatio-temporal modeling of saltatory conduction in neurons using Poisson-Nernst-Planck treatment and estimation of conduction velocity
Creators: name: Gulati, Rahul
name: Rudraraju, Shiva
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Action potential propagation along the axons and across the dendrites is the foundation of the electrical activity observed in the brain and the rest of the central nervous system. Theoretical and numerical modeling of this action potential activity has long been a key focus area of electro-chemical neuronal modeling. Specifically, considering the presence of nodes of Ranvier along the myelinated axon, single-cable models of the propagation of action potential have been popular. Building on these models, and considering a secondary electrical conduction pathway below the myelin sheath, the double-cable model has been proposed. Such cable theory based treatments have inherent limitations in their lack of a representation of the spatio-temporal evolution of the neuronal electro-chemistry. In contrast, a Poisson-Nernst-Planck (PNP) based electro-diffusive framework accounts for the underlying spatio-temporal ionic concentration dynamics and is a more comprehensive treatment. In this work, a high-fidelity implementation of the PNP model is demonstrated. This model is shown to produce results similar to the cable theory based electrical models, and in addition, the rich spatio-temporal evolution of the underlying ionic transport is captured. Novel to this work is the extension of PNP model to axonal geometries with multiple nodes of Ranvier and multiple variants of the electro-diffusive model - PNP without myelin, PNP with myelin, and PNP with the myelin sheath and peri-axonal space. Further, we apply this spatio-temporal model to numerically estimate conduction velocity in a rat axon. Specifically, saltatory conduction due to the presence of myelin sheath and the peri-axonal space is investigated.
description: Published in Brain Multiphysics, 2022
Has JWST already falsified dark-matter-driven galaxy formation?
Creators: name: Haslbauer, Moritz
name: Kroupa, Pavel
name: Zonoozi, Akram Hasani
name: Haghi, Hosein
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The James Webb Space Telescope (JWST) discovered several luminous high-redshift galaxy candidates with stellar masses of $M_{*} \gtrsim 10^{9} \, \rm{M_{\odot}}$ at photometric redshifts $z_{\mathrm{phot}} \gtrsim 10$ which allows to constrain galaxy and structure formation models. For example, Adams et al. identified the candidate ID 1514 with $\log_{10}(M_{*}/M_{\odot}) = {9.8}_{-0.2}^{+0.2}$ located at $z_{\mathrm{phot}} = 9.85_{-0.12}^{+0.18}$ and Naidu et al. found even more distant candidates labeled as GL-z11 and GL-z13 with $\log_{10}(M_{*}/M_{\odot}) = 9.4_{-0.3}^{+0.3}$ at $z_{\mathrm{phot}}=10.9_{-0.4}^{+0.5}$ and $\log_{10}(M_{*}/M_{\odot}) = 9.0_{-0.4}^{+0.3}$ at $z_{\mathrm{phot}} = 13.1_{-0.7}^{+0.8}$, respectively. Assessing the computations of the IllustrisTNG (TNG50-1 and TNG100-1) and EAGLE projects, we investigate if the stellar mass buildup as predicted by the $Λ$CDM paradigm is consistent with these observations assuming that the early JWST calibration is correct and that the candidates are indeed located at $z \gtrsim 10$. Galaxies formed in the $Λ$CDM paradigm are by more than an order of magnitude less massive in stars than the observed galaxy candidates implying that the stellar mass buildup is more efficient in the early Universe than predicted by the $Λ$CDM models. This in turn would suggest that structure formation is more enhanced at $z \gtrsim 10$ than predicted by the $Λ$CDM framework. We show that different star formation histories could reduce the stellar masses of the galaxy candidates alleviating the tension. Finally, we calculate the galaxy-wide initial mass function (gwIMF) of the galaxy candidates assuming the integrated galaxy IMF theory. The gwIMF becomes top-heavy for metal-poor starforming galaxies decreasing therewith the stellar masses compared to an invariant canonical IMF.
description: Accepted for publication in ApJL, 10 pages, 4 figures, 1 tables
General Resource Management for Computationally Demanding Scientific Software
Creators: name: Guo, Xinchen
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: High performance computing

description: Many scientific problems contain nonlinear systems of equations that require multiple iterations to reach converged results. Such software pattern follows the bulk synchronous parallel model. In that sense, an iteration is a superstep, which includes computation of local data, global communication to update data for the next iteration, and synchronization between iterations. In modern HPC environments, MPI is used to distribute data and OpenMP is used to accelerate computation of each data. More MPI processes increase the cost of communication and synchronization whereas more OpenMP threads increase the overhead of multithreading. A proper combination of MPI and OpenMP is critical to accelerate each superstep. Proper orchestration of MPI processes and OpenMP threads is also needed to efficiently use the underlying hardware resources. Purdue’s multi-purpose nanodevice simulation tool NEMO5 distributes the computation of independent spectral points by MPI. The computation of each spectral point is accelerated with OpenMP threads. A few examples of resource utilization optimizations are presented. One type of simulation applies the non-equilibrium Green’s function method to accurately predict drug molecules. Our profiling results suggest the optimum combination has more MPI processes and fewer OpenMP threads. However, NEMO5's memory usage has large spikes for each spectral point. Such behavior limits the concurrency of spectral point calculation due to the lack of swap space on HPC nodes to prevent out-of-memory.
 A distributed resource management framework is proposed and developed to automatically and dynamically manage memory and CPU usage. The concurrent calculation of spectral points is pipelined to avoid simultaneous peak memory usage. This allows more MPI processes and fewer OpenMP threads for higher parallel efficiency. Automatic CPU usage adjustment also reduces the time cost to fill and drain the calculation pipeline. The resource management framework requires minimum code intrusion and successfully speeds up the calculation. It can also be generalized for other simulation software.
ExploreSalon: Unveil Hidden Stories from the Past
Creators: name: Charvat, Vera Maria
name: Ďurčo, Matej
name: Königshofer, Elisabeth
name: Petrovic-Majer, Sylvia
name: Woldrich, Anna
Publisher: name: Zenodo
Year: 2023
Subjects: Cultural Hackathon

description: ExploreSalon: Unveil Hidden Stories from the Past
 Concept and Outcome of a Digital Humanities and Cultural Heritage "Hackathon" "When people interact, they leave traces: uncountable letters, diaries, chronicles, plaques, and other written records have preserved memories about people – long before the rise of smartphones and social media."1
 For the duration of one week (22nd – 26th May 2023) the so-called ExploreSalon will offer a collaborative space to explore digitized memories, in the form of curated biographic, spatial and temporal datasets with focus on Vienna 1900. The event will be organized by the Austrian Centre for Digital Humanities and Cultural Heritage (ACDH-CH) and supported by the CLARIAH-AT2 national consortium as part of its knowledge sharing activities. The ExploreSalon has two goals: Bring people of diverse backgrounds together and provide them with the opportunity to discover innovative ways of data-based storytelling – exploring stories hidden in the data, presenting ideas and sharing findings.
 [...]
 This poster will present the underlying concept and general workflow of this form of cultural hackathon, elaborate on challenges such as bringing together people with different backgrounds and motivate them to get creative and exchange their ideas. The results and outcomes of the individual groups formed during the ExploreSalon event will enrich and underline the presentation.
The Luminosity Function of Tidal Disruption Flares for the ZTF-I Survey
Creators: name: Lin, Zheyu
name: Jiang, Ning
name: Kong, Xu
name: Huang, Shifeng
name: Lin, Zesen
name: Zhu, Jiazheng
name: Wang, Yibo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The high-cadence survey of Zwicky Transient Facility (ZTF) has completely dominated the discovery of tidal disruption events (TDEs) in the past few years and resulted in the largest sample of TDEs with optical/UV light curves well-sampled around their peaks, providing us an excellent opportunity to construct a peak luminosity function (LF) of tidal disruption flares (TDFs). The new construction is necessary particularly considering that the most updated LF reported in literature has been inferred from only 13 sources from 5 different surveys. Here we present the optical and blackbody LFs calculated by 33 TDFs discovered in the ZTF-I survey. The optical LF can be described by both a power-law profile $dN/dL_g\propto L_g^{-2.3\pm0.2}$, and a Schechter-like function. The blackbody LF can be described by a power-law profile $dN/dL_{\rm bb}\propto L_{\rm bb}^{-2.2\pm0.2}$, shallower than the LF made of previous van Velzen (2018) sample. A possible low-luminosity turnover in the optical LF supports an Eddington-limited emission scenario. The drop of volumetric rate at high luminosity suggests a rate suppression due to direct captures of the black hole. The total volumetric rate is one order of magnitude lower than the previous estimation, which is probably not simply caused by the high fraction post-peak sources (7/13) in the previous sample. Instead, the normalization step during the previous LF construction to reconcile various surveys might adversely amplify the influence of serendipitous discoveries. Therefore, TDFs selected from ongoing and upcoming uniform surveys like ZTF, Vera Rubin Observatory (VRO) and Wide-Field Survey Telescope (WFST) should yield more accurate LFs.
description: 13 pages, 3 figures, 2 tables, accepted for publication in ApJ Letters
Robust Device-Independent Randomness Amplification with Few Devices
Creators: name: Brandao, Fernando G. S. L.
name: Ramanathan, Ravishankar
name: Grudka, Andrzej
name: Horodecki, Karol
name: Horodecki, Michal
name: Horodecki, Pawel
name: Szarek, Tomasz
name: Wojewodka, Hanna
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Randomness amplification is the task of transforming a source of somewhat random bits into a source of fully random bits. Although it is impossible to amplify randomness from a single source by classical means, the situation is different considering non-local correlations allowed by quantum mechanics. Here we give the first device-independent protocol for randomness amplification using a constant number of devices. The protocol involves four devices, can amplify any non-deterministic source into a fully random source, tolerates a constant rate of error, and has its correctness based solely on the assumption of no-signaling between the devices. In contrast all previous protocols either required an unbounded number of devices, or could only amplify sources sufficiently close to fully random.
description: 36 pages, 5 figure. v2 major revision, correcting error in previous proof of security of the protocol. Two new authors added