cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Kunst als Muntermacher in der Finanzkrise?! Bericht von der dritten Global Art Investment Conference der London Business School (LBS), 29. Mai 2009
Creators: name: Schroeter, Philine
Publisher: name: Kunstrechtsspiegel
Year: 2017

description: -
description: Kunstrechtsspiegel, Nr. 2 (2009): Kunstrechtsspiegel
„Denkmalschutz in Europa - Vergangenheit, Gegenwart und Zukunft“: Symposium der Forschungsgesellschaft Kunst & Recht in Wien am 18. Juni 2010
Creators: name: Kemle, Nicolai
Publisher: name: Kunstrechtsspiegel
Year: 2017

description: -
description: Kunstrechtsspiegel, Nr. 2 (2010): Kunstrechtsspiegel
New Morning
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019

description: Recording of Bob Dylan's album New Morning: "If Not For You," "Day of the Locusts," "Time Passes Slowly," "Went to See the Gypsy," "Winterlude," "If Dogs Run Free," "New Morning," "Sign on the Window," "One More Weekend," "The Man in Me," "Three Angels," "Father of Night
title: Monetary Policy Pass-Through with Central Bank Digital Currency
Creators: name: Jiang, Janet Hua
name: Zhu, Yu
Publisher: name: Bank of Canada
Year: 2021

description: "Many central banks are considering issuing a central bank digital currency (CBDC). This would introduce a new policy tool—interest on CBDC. We investigate how this new tool would interact with traditional monetary policy tools, such as the interest on central bank reserves. 

We build  a model in which CBDC and bank deposits are perfect substitutes as electronic payment methods. We discuss the effects (or pass-through) of two monetary policy tools: the interest on reserves and the interest on CBDC. Specifically, we examine how, in the presence of each other, these two policy tools affect the rates and quantities of deposits and loans.

We find that when it is in effect, the interest on CBDC fully dictates the deposit rate and eliminates the pass-through from the interest on reserves to the deposit rate. How the interest on CBDC affects the pass-through from the interest on reserves to other economic variables depends on the market structure of the deposit market. While CBDC tends to weaken the pass-through of the interest on reserves when banks have market power, the reverse holds when the market is competitive. In turn, a high interest on reserves may weaken the pass-through of the interest on CBDC. In general, coordination between the two policy rates is needed to effectively achieve policy goals."

description: "De nombreuses banques centrales envisagent l’émission d’une monnaie numérique. Cette monnaie introduirait un nouvel outil d’intervention, soit le taux d’intérêt appliqué à la monnaie numérique de banque centrale (MNBC). Nous nous intéressons à la manière dont ce nouvel outil interagirait avec les instruments de politique monétaire traditionnels, comme le taux d’intérêt des réserves de banque centrale. 

Nous construisons un modèle dans lequel la MNBC et les dépôts bancaires sont de parfaits substituts comme modes de paiement électroniques. Nous analysons les effets (ou la transmission) de deux instruments de politique monétaire : le taux d’intérêt des réserves et celui de la MNBC. En particulier, nous étudions comment ces deux instruments, en présence l’un de l’autre, influent sur les taux des dépôts et des prêts et leurs volumes.

Nous constatons que lorsqu’il est en vigueur, le taux d’intérêt de la MNBC dicte entièrement celui des dépôts et élimine la transmission du taux d’intérêt des réserves sur celui des dépôts. L’incidence du taux de la MNBC sur la transmission du taux d’intérêt des réserves à d’autres variables économiques dépend de la structure du marché des dépôts. Le taux de la MNBC a tendance à réduire la transmission du taux des réserves quand les banques ont un pouvoir de marché, mais c’est l’inverse lorsque le marché est concurrentiel. Si le taux des réserves est élevé, il peut à son tour réduire la transmission du taux de la MNBC. En général, il faut que ces deux taux soient coordonnés pour atteindre efficacement les objectifs de politique monétaire."
Archäologie im altsprachlichen Unterricht am Beispiel von Ciceros zweiter Rede gegen Gaius Verres
Creators: name: Dally, Urte
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: In seinen zwei berühmten Reden gegen C. Verres klagte Cicero den früheren Prätor an, Sizilien während seiner Amtszeit von 73-71 v. Chr. ausgeplündert zu haben. Der archäologische Hintergrund dieser Reden, insbesondere von II 4, erleichtert uns ihr Verständnis. Während der späten Republik erfreute sich griechische Kunst in Rom zunehmender Beliebtheit. Römische Aristokraten sammelten qualitativ hochwertige griechische Skulpturen, Gemmen und andere Objekte. Beide, Verres und Cicero, waren Sammler. Cicero erwähnt auch in der Rede II 4 zahlreiche Orte und Dinge, die uns heute gut bekannt sind, und gibt dadurch eine gute Gelegenheit, literarische und archäologische Quellen im Unterricht miteinander zu vergleichen. Es existiert jedoch kein archäologischer Kontext, der exakt mit Ciceros Text übereinstimmt. Aus diesem Grunde müssen wir plausible Situationen rekonstruieren, und zwar unter sorgfältiger Berücksichtigung der archäologischen Aspekte, d. h. der Herkunft der Objekte und ihrer chronologischen Bestimmung. Hierfür hat Urte Dally die antike Stadt Acragas/Agrigento gewählt, die Cicero mehrmals erwähnt. Wir spazieren durch die Straßen und treffen Hyposthenes, einen wohlhabenden Bürger, der unter Verres zu leiden hatte. Er zeigt uns sein Zuhause und einige Gegenstände, die Verres‘ Plünderung unbeschadet überstanden haben.
description: Pegasus-Onlinezeitschrift, Bd. 3, Nr. 2 (2003): Pegasus-Onlinezeitschrift
Internet a la Scipio. Neue Streiflichter aus der Antike
Creators: name: Bartels, Klaus
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: Dieser zweiteilige Beitrag stellt einen kleinen Auszug aus dem neuen Buch von Klaus Bartels dar (Internet à la Scipio, Zürich / Mainz 2004, Philipp von Zabern), das jetzt überall im Buchhandel erhältlich ist. In den beiden Teilen des Beitrags werden die näheren Hintergründe von Inschriften in Rom anregend beschrieben. Zum einen wird die berühmte Grabinschrift des Malers Raffael im Pantheon näher betrachtet, zum anderen die vier Inschriften, die sich auf der Basis des Esquilinischen Obelisken befinden.
description: Pegasus-Onlinezeitschrift, Bd. 4, Nr. 3 (2004): Pegasus-Onlinezeitschrift
Epistemological shifts in knowledge and education in Islam: A new perspective on the emergence of radicalization amongst Muslims
Creators: name: Sabic-El-Rayess, Amra
Publisher: name: Columbia University
Year: 2019
Subjects: Knowledge, Theory of
Islam
Islamic education
Radicalization
Radicalism--Religious aspects--Islam
White nationalism

description: I theorize that the idea of knowledge and education has shifted in Islam from an inclusive and rational search for all knowledge to a narrowed focus on religious knowledge, void of rationality. By synthesizing literature on education and knowledge in Islam, this study identifies three shifts in the cultural history of Islamic education. I argue that those shifts in what was deemed valuable knowledge have played a significant role in the emergence of radicalization today. The study shows that once the social world of Islam destabilized, the sense of belonging and sense making became inward and less reflexive as compared to that of early Muslims. Belief became privileged over the rationality mechanisms that had previously formed Islamic endeavors. I demonstrate that a decline in intellectual and scientific production followed, allowing extremists to skew Islam’s narrative by putting forward an idealized version of the Islamic caliphate divorced from rationality.
Topological and Quantum Stability of Low-Dimensional Crystalline Lattices with Multiple Nonequivalent Sublattices
Creators: name: Avramov, Pavel V.
name: Kuklin, Artem V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The terms of topological and quantum stabilities of low-dimensional crystalline carbon lattices with multiple non-equivalent sublattices are coined using theoretical analysis, multilevel simulations, and available experimental structural data. It is demonstrated that complex low-dimensional lattices are prone to periodicity breakdown caused by structural deformations generated by PBC approach. To impose PBC limitations for low-dimensional lattices, the Topology Conservation Theorem (TCT) is formulated and proved. It is shown that the lack of perfect filling of 2D crystalline space units may cause formation of i) Structure waves; ii) Nanotubes or rolls; iii) Saddle structures; iv) Aperiodic atomic clusters; v) Stabilization of 2D lattices by aromatic resonance, correlation effects, or van-der-Waals interactions. The effect of quantum instability of infinite structural waves is studied using quasiparticle approach. It is found that both perfect finite-sized, or stabilized structural waves can exist and can be synthesized. It is shown that for low-dimensional lattices prone to breakdown of translation invariance (TI), complete active space of normal coordinates cannot be reduced to a subspace of TI normal coordinates. As a result, constrained TI subspace structural minimization may artificially return a regular point at the potential energy surface as either a global/local minimum/maximum. It is proved that phonon dispersion cannot be used as solid and final proof of their stability. It is shown that ab initio molecular dynamics (MD) PBC Nosé-Hoover thermostat algorithm constrains the linear dimensions of the periodic slabs in MD box preventing their thermostated equilibration. Based on rigorous TCT analysis, a flowchart algorithm for structural analysis of low-dimensional crystals is proposed and proved to be a powerful tool for theoretical design of advanced complex nanomaterials.
description: Main body of the manuscript: 43 pages, 18 figures, 4 tables. SI1 section: 4 tables, 15 figures. SI2 section: 2 figures
Heiße Bachelor, heiße Master gar ... Die neuen modularisierten Lehramtsstudiengänge Latein und Griechisch an der Freien Universität Berlin und Humboldt-Universität zu Berlin
Creators: name: Baumgarten, Roland
name: Blößner, Norbert
name: Kipf, Stefan
name: Mundt, Felix
name: Schmitzer, Ulrich
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: Seit dem WS 2004/05 sind in Berlin sowohl an der Humboldt-Universität (HU) als auch an der Freien Universität (FU) die neuen Bachelor-Studiengänge (BA) eingeführt. In diesem Überblick werden die BA-Studiengänge der HU und der FU von der Expertengruppe selbst, die diese Studiengänge konzipiert hat, vorgestellt. Der Beitrag bietet somit eine interessante Gegenüberstellung zweier möglicher Realisierungen der neuen modularisierten Lehramtsstudiengängen.
description: Pegasus-Onlinezeitschrift, Bd. 5, Nr. 1 (2005): Pegasus-Onlinezeitschrift
Autophonic Loudness of Singers in Simulated Room Acoustic Environments
Creators: name: Yadav, Manuj
name: Cabrera, Densil
Publisher: name: arXiv
Year: 2023
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: This paper aims to study the effect of room acoustics and phonemes on the perception of loudness of one's own voice (autophonic loudness) for a group of trained singers. For a set of five phonemes, 20 singers vocalized over several autophonic loudness ratios, while maintaining pitch constancy over extreme voice levels, within five simulated rooms. There were statistically significant differences in the slope of the autophonic loudness function (logarithm of autophonic loudness as a function of voice sound pressure level) for the five phonemes, with slopes ranging from 1.3 (/a:/) to 2.0 (/z:/). There was no significant variation in the autophonic loudness function slopes with variations in room acoustics. The autophonic room response, which represents a systematic decrease in voice levels with increasing levels of room reflections, was also studied, with some evidence found in support. Overall, the average slope of the autophonic room response for the three corner vowels (/a:/, /i:/, and /u:/) was -1.4 for medium autophonic loudness. The findings relating to the slope of the autophonic loudness function are in agreement with the findings of previous studies where the sensorimotor mechanisms in regulating voice were shown to be more important in the perception of autophonic loudness than hearing of room acoustics. However, the role of room acoustics, in terms of the autophonic room response, is shown to be more complicated, requiring further inquiry. Overall, it is shown that autophonic loudness grows at more than twice the rate of loudness growth for sounds created outside the human body.
X-ray observation of the shocked red supergiant wind of Cassiopeia A
Creators: name: Lee, Jae-Joon
name: Park, Sangwook
name: Hughes, John P.
name: Slane, Patrick O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Cas A is a Galactic supernova remnant whose supernova explosion is observed to be of Type IIb from spectroscopy of its light echo. Having its SN type known, observational constraints on the mass-loss history of Cas A's progenitor can provide crucial information on the final fate of massive stars. In this paper, we study X-ray characteristics of the shocked ambient gas in Cas A using the 1 Ms observation carried out with the Chandra X-Ray Observatory and try to constrain the mass-loss history of the progenitor star. We identify thermal emission from the shocked ambient gas along the outer boundary of the remnant. Comparison of measured radial variations of spectroscopic parameters of the shocked ambient gas to the self-similar solutions of Chevalier show that Cas A is expanding into a circumstellar wind rather than into a uniform medium. We estimate a wind density nH ~ 0.9 $\pm$ 0.3 cm$^{-3}$ at the current outer radius of the remnant (~3 pc), which we interpret as a dense slow wind from a red supergiant (RSG) star. Our results suggest that the progenitor star of Cas A had an initial mass around 16 Msun, and its mass before the explosion was about 5 Msun, with uncertainties of several tens of percent. Furthermore, the results suggest that, among the mass lost from the progenitor star (~11 Msun), a significant amount (more than 6 Msun) could have been via its RSG wind.
description: ApJ Accepted. 11 pages (with emulateapj style)
title: Βελτιώνοντας το κλίμα της πόλης. Αξιοποίηση της ψυκτικής ικανότητας του Ηριδανού ποταμού στο περιβάλλον της πλατείας Μοναστηρακίου
title: Improving the micro-climate of the city. Using the cooling capacity of Iridanos river to affect the environmental conditions of Monastiraki square
Creators: name: Κοτσυφης Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2019

description: Με την πεποίθηση ότι η ενέργεια μπορεί να συμμετέχει πιο ενεργά στην αρχιτεκτονική σύνθεση η παρούσα διπλωματική εστιάζει στην πλατεία Μοναστηρακίου. Μέσω της σκίασης, της δημιουργίας υπόσκαφων χώρων και της αξιοποίησης της ψυκτικής ικανότητας του Ηριδανού ποταμού επιχειρείται να καταστεί πιο άνετη η παραμονή στην πλατεία κατά το μεσογειακό καλοκαίρι.
Amid COVID and Racial Injustice, Teachers Matter More than Ever
Creators: name: Sabic-El-Rayess, Amra
Publisher: name: Columbia University
Year: 2020
Subjects: Education
Teachers
Teacher-student relationships
COVID-19 (Disease)--Social aspects
Racism

description: Today, our students need the kind of teaching that fosters understanding and knowledge — not in a social, political, or emotional vacuum but instead, by doing the messy work of negotiating conflicts and compromises as we incorporate more of our lived experiences into our math, literature, history, and science lessons. As our youth process their experiences of this pandemic and of the public images of racist violence and public protest, we must make our post-COVID19 classrooms into physical “safe spaces” that allow them to confront their traumas, losses, and fears about their futures.
Logarithmic Bundles Of Hypersurface Arrangements In P^n
Creators: name: Angelini, Elena
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Let D = {D_{1},...,D_{l}} be an arrangement of smooth hypersurfaces with normal crossings on the complex projective space P^n and let Ω^{1}_{P^n}(log D) be the logarithmic bundle attached to it. Following [1], we show that Ω^{1}_{P^n}(log D) admits a resolution of lenght 1 which explicitly depends on the degrees and on the equations of D_{1},...,D_{l}. Then we prove a Torelli type theorem when all the D_{i}'s have the same degree d and l >= {{n+d} \choose {d}}+3: indeed, we recover the components of D as unstable smooth hypersurfaces of Ω^{1}_{P^n}(log D). Finally we analyze the cases of one quadric and a pair of quadrics, which yield examples of non-Torelli arrangements. In particular, through a duality argument, we prove that two pairs of quadrics have isomorphic logarithmic bundles if and only if they have the same tangent hyperplanes.
description: 21 pages, 2 figures, Collectanea Mathematica 2014
Multi-Output Physics-Informed Neural Networks for Forward and Inverse PDE Problems with Uncertainties
Creators: name: Yang, Mingyuan
name: Foster, John T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Physics-informed neural networks (PINNs) have recently been used to solve various computational problems which are governed by partial differential equations (PDEs). In this paper, we propose a multi-output physics-informed neural network (MO-PINN) which can provide solutions with uncertainty distributions for both forward and inverse PDE problems with noisy data. In this framework, the uncertainty arising from the noisy data is first translated into multiple measurements regarding the prior noise distribution using the bootstrap method, and then the outputs of neural networks are designed to satisfy the measurements as well as the underlying physical laws.The posterior estimation of target parameters can be obtained at the end of training, which can be further used for uncertainty quantification and decision making. In this paper, MO-PINNs are demonstrated with a series of numerical experiments including both linear and nonlinear, forward and inverse problems. The results show that MO-PINN is able to provide accurate predictions with noisy data.In addition, we also demonstrate that the prediction and posterior distributions from MO-PINNs are consistent with the solutions from traditional a finite element method (FEM) solver and Monte Carlo methods given the same data and prior knowledge. Finally, we show that additional statistical knowledge can be incorporated into the training to improve the prediction if available.
The effect of $f(R,T)$ modified gravity on mass and radius of pulsar HerX1
Creators: name: Nashed, G. G. L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent findings from the Neutron Star Interior Composition Explorer (NICER) have opened up opportunities to investigate the potential coupling between matter and geometry, along with its resulting physical implications. Millisecond pulsars serve as an ideal subject for conducting such tests and examining these phenomena. We apply the field equations of modified gravity, $f(R, T)=R+α\, T$ to a spherically symmetric spacetime, where $R$ is the Ricci scalar, $α$ is a dimensional parameter, and $T$ is the matter of the geometry. Five unknown functions are present in the output system of differential equations, which consists of three equations. To close the system, we make explicit assumptions about the anisotropy and the radial metric potential, $g_{rr}$. We then solve the output differential equations and derive the explicit forms of the components of the energy-momentum tensor, namely, density, radial, and tangential pressures.
description: 22 pages, 10 figures, 3 tables
„When in Rome, do as the Romans do …“ Plädoyer und Vorschläge für eine Kooperation der Schulfremdsprachen Englisch und Latein
Creators: name: Doff, Sabine
name: Kipf, Stefan
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: Die bundesdeutsche Schullandschaft ist in Bewegung: Schulzeitverkürzung und der Frühbeginn des Fremdsprachenunterrichts sind nur zwei Beispiele, die aber direkte Folgen für den Unterricht haben. Diese Veränderungen erfordern, über die bisherigen Denkmuster hinauszugehen und Neues zu wagen: Müssen wir durch den Verlust an Lernzeit nicht gezielt nach Entlastungen für die Schüler suchen? Ist es daher nicht endlich an der Zeit, eine sinnvolle Kooperation zwischen neuen und alten Sprachen anzustreben? Vor diesem Hintergrund stellen Sabine Doff und Stefan Kipf ein neues Forschungsprojekt vor, in dem erstmals unter Beteiligung von Anglistik und Latinistik versucht wird, ein systematisches Konzept für die Zusammenarbeit von Englisch- und Lateinunterricht zu erarbeiten.
description: Pegasus-Onlinezeitschrift, Bd. 7, Nr. 2 (2007): Pegasus-Onlinezeitschrift
title: Coral Reef Ecosystem Monitoring Report for the Pacific Remote Islands Marine National Monument 2000 - 2017: Chapter 1 Overview (Introduction, Report Structure, Operational Background, and Methods)
Creators: name: Brainard, Russell
name: Acoba, Tomoko
name: Asher, Megan A.M.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: SP-19-006a
title: Measuring and Evaluating Strategic Communications at the Bank of Canada
Creators: name: Portelance, Annie
Publisher: name: Bank of Canada
Year: 2021

description: The Bank of Canada’s Communications Department has developed a framework to quantify and qualify the Bank’s communications efforts and their results. Using data-based measurement and evaluation, the department can assess the impact of the Bank’s communications activities and gauge the department’s contribution to the Bank’s overall goals.

description: Le département des Communications de la Banque du Canada a élaboré un cadre pour quantifier et qualifier les activités de communication de la Banque et leurs résultats. En recourant à la mesure et à l’évaluation de données, le département peut estimer l’incidence des communications de la Banque et la contribution du département à l’atteinte de l’ensemble des objectifs de l’institution.
A Note Basis Properties for Fractional Hydrogen Atom Equation
Creators: name: Bas, E.
name: Metin, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 26A33

description: In this paper, spectral analysis of fractional Sturm Liouville problem defined on (0,1], having the singularity of type at zero and research the fundamental properties of the eigenfunctions and eigenvalues for the operator. We show that the eigenvalues and eigenfunctions of the problem are real and orthogonal, respectively. Furthermore,we give some important theorems and lemmas for fractional hydrogen atom equation.
description: We arrange to our manuscript. Because, We do min\"or revision. we want to withdraw your systems
Astraeus VI: Hierarchical assembly of AGN and their large-scale effect during the Epoch of Reionization
Creators: name: Trebitsch, Maxime
name: Hutter, Anne
name: Dayal, Pratika
name: Gottlöber, Stefan
name: Legrand, Laurent
name: Yepes, Gustavo
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: In this work, the sixth of a series, we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) framework to investigate the nature of the sources that reionized the Universe. We extend ASTRAEUS, which already couples a galaxy formation semi-analytical model with a detailed semi-numerical reionization scheme, to include a model for black hole formation, growth, and the production of ionizing radiation from associated AGN (active galactic nuclei). We calibrate our fiducial AGN model to reproduce the bolometric luminosity function at z ~ 5, and explore the role of the resulting AGN population in reionizing the Universe. We find that in all the models yielding a reasonable AGN luminosity function, galaxies dominate overwhelmingly the ionizing budget during the Epoch of Reionization, with AGN accounting for 1-10% of the ionizing budget at z=6 and starting to play a role only below z < 5.
description: 15+2 pages, 14+1 figures, 1 table. Accepted in MNRAS
"Für niemand. Für mich." – Antikentransformationen in Jean Anouilhs Antigone
Creators: name: Schlichtmann, Anne
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2017

description: Die Antigone des Sophokles gehört zu den Standardlektüren des Griechischunterrichts. Anne Schlichtmann eröffnet für diese Lektüre eine interessante und interpretatorisch ausgesprochen ertragreiche Perspektive, indem sie Jean Anouilhs Antigone unter dem Aspekt der Antikentransformation im Verhältnis zur antiken Vorlage analysiert.
description: Pegasus-Onlinezeitschrift, Bd. 8, Nr. 1 (2008): Pegasus-Onlinezeitschrift
Topological Corner States in Graphene by Bulk and Edge Engineering
Creators: name: Zeng, Junjie
name: Chen, Chen
name: Ren, Yafei
name: Liu, Zheng
name: Ren, Wei
name: Qiao, Zhenhua
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two-dimensional higher-order topology is usually studied in (nearly) particle-hole symmetric models, so that an edge gap can be opened within the bulk one. But more often deviates the edge anticrossing even into the bulk, where corner states are difficult to pinpoint. We address this problem in a graphene-based $\mathbb{Z}_2$ topological insulator with spin-orbit coupling and in-plane magnetization both originating from substrates through a Slater-Koster multi-orbital model. The gapless helical edge modes cross inside the bulk, where is also located the magnetization-induced edge gap. After demonstrating its second-order nontriviality in bulk topology by a series of evidence, we show that a difference in bulk-edge onsite energy can adiabatically tune the position of the crossing/anticrossing of the edge modes to be inside the bulk gap. This can help unambiguously identify two pairs of topological corner states with nonvanishing energy degeneracy for a rhombic flake. We further find that the obtuse-angle pair is more stable than the acute-angle one. These results not only suggest an accessible way to "find" topological corner states, but also provide a higher-order topological version of "bulk-boundary correspondence".
Deep Networks on Toroids: Removing Symmetries Reveals the Structure of Flat Regions in the Landscape Geometry
Creators: name: Pittorino, Fabrizio
name: Ferraro, Antonio
name: Perugini, Gabriele
name: Feinauer, Christoph
name: Baldassi, Carlo
name: Zecchina, Riccardo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We systematize the approach to the investigation of deep neural network landscapes by basing it on the geometry of the space of implemented functions rather than the space of parameters. Grouping classifiers into equivalence classes, we develop a standardized parameterization in which all symmetries are removed, resulting in a toroidal topology. On this space, we explore the error landscape rather than the loss. This lets us derive a meaningful notion of the flatness of minimizers and of the geodesic paths connecting them. Using different optimization algorithms that sample minimizers with different flatness we study the mode connectivity and relative distances. Testing a variety of state-of-the-art architectures and benchmark datasets, we confirm the correlation between flatness and generalization performance; we further show that in function space flatter minima are closer to each other and that the barriers along the geodesics connecting them are small. We also find that minimizers found by variants of gradient descent can be connected by zero-error paths composed of two straight lines in parameter space, i.e. polygonal chains with a single bend. We observe similar qualitative results in neural networks with binary weights and activations, providing one of the first results concerning the connectivity in this setting. Our results hinge on symmetry removal, and are in remarkable agreement with the rich phenomenology described by some recent analytical studies performed on simple shallow models.
Projective Compactifications and Einstein metrics
Creators: name: Cap, Andreas
name: Gover, A. Rod
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 54D35, 53A20, 53B21, 53B10, 53C29, 35N10

description: For complete affine manifolds we introduce a definition of compactification based on the projective differential geometry (i.e.\ geodesic path data) of the given connection. The definition of projective compactness involves a real parameter $α$ called the order of projective compactness. For volume preserving connections, this order is captured by a notion of volume asymptotics that we define. These ideas apply to complete pseudo-Riemannian spaces, via the Levi-Civita connection, and thus provide a notion of compactification alternative to conformal compactification. For each order $α$, we provide an asymptotic form of a metric which is sufficient for projective compactness of the given order, thus also providing many local examples. Distinguished classes of projectively compactified geometries of orders one and two are associated with Ricci-flat connections and non--Ricci--flat Einstein metrics, respectively. Conversely, these geometric conditions are shown to force the indicated order of projective compactness. These special compactifications are shown to correspond to normal solutions of classes of natural linear PDE (so-called first BGG equations), or equivalently holonomy reductions of projective Cartan/tractor connections. This enables the application of tools already available to reveal considerable information about the geometry of the boundary at infinity. Finally, we show that metrics admitting such special compactifications always have an asymptotic form as mentioned above.
description: 30 Pages. v2: Added a necessary technical assumption in Theorem 2.6. Adapted numbering to version to be published in J. reine angew. math. (Crelle's J.)
title: Coral Reef Ecosystem Monitoring Report for the Pacific Remote Islands Marine National Monument 2000–2017: Chapter 2 Palmyra Atoll
Creators: name: Brainard, Russell
name: Acoba, Tomoko
name: Asher, Megan A.M.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: SP-19-006b
Evidence of magnetoelectronic electromagnon mediated transport in flexoelectronic heterostructures
Creators: name: Katailiha, Anand
name: Lou, Paul C.
name: Bhardwaj, Ravindra G.
name: Beyermann, Ward P.
name: Kumar, Sandeep
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The superposition of atomic vibrations and flexoelectronic effect gives rise to a cross correlation between free charge carriers and temporal magnetic moment of phonons in conducting heterostructures under an applied strain gradient. The resulting dynamical coupling is expected to give rise to quasiparticle excitations called as magnetoelectronic electromagnon that carries electronic charge and temporal magnetic moment. Here, we report experimental evidence of magnetoelectronic electromagnon in the freestanding degenerately doped p-Si based heterostructure thin film samples. These quasiparticle excitations give rise to long-distance (>100um) spin transport; demonstrated using spatially modulated transverse magneto-thermoelectric and non-local resistance measurements. The magnetoelectronic electromagnons are non-reciprocal and give rise to large magnetochiral anisotropy (0.352 A-1T-1) that diminishes at lower temperatures. The superposition of non-reciprocal magnetoelectronic electromagnons gives rise to longitudinal and transverse modulations in charge carrier density, spin density and magnetic moment; demonstrated using the Hall effect and edge dependent magnetoresistance measurements, which can also be called as inhomogeneous magnetoelectronic multiferroic effect. These quasiparticle excitations are analogues to photons where time dependent polarization and temporal magnetic moment replaces electric and magnetic field, respectively and most likely topological because it manifests topological Nernst effect. Hence, the magnetoelectronic electromagnon can potentially give rise to quantum interference and entanglement effects in conducting solid state system at room temperature in addition to efficient spin transport.
One-loop Corrections to the Higgs Boson Invisible Decay in a Complex Singlet Extension of the SM
Creators: name: Egle, Felix
name: Mühlleitner, Margarete
name: Santos, Rui
name: Viana, João
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The search for dark matter (DM) at colliders is founded on the idea of looking for something invisible. There are searches based on production and decay processes where DM may reveal itself as missing energy. If nothing is found, our best tool to constrain the parameter space of many extensions of the Standard Model (SM) with a DM candidate is the Higgs boson. As the measurements of the Higgs couplings become increasingly precise, higher-order corrections will start to play a major role. The tree-level contribution to the invisible decay width provides information about the portal coupling. Higher-order corrections also gives us access to other parameters from the dark sector of the Higgs potential that are not present in the tree-level amplitude. In this work we will focus on the complex singlet extension of the SM in the phase with a DM candidate. We calculate the one-loop electroweak corrections to the decay of the Higgs boson into two DM particles. We find that the corrections are stable and of the order of a few percent. The present measurement of the Higgs invisible branching ratio, BR$(H \to$ invisible $) < 0.11$, already constrains the parameter space of the model at leading order. We expect that by the end of the LHC the experimental measurement will require the inclusion of the electroweak corrections to the decay in order to match the experimental accuracy. Furthermore, the only competing process, which is direct detection, is shown to have a cross section below the neutrino floor.
description: 35 pages, 8 figures
Linkages to the Mining Sector in Colombia
Creators: name: Deutsche Gesellschaft Für Internationale Zusammenarbeit
name: Columbia Center On Sustainable Investment
name: Mines, Ministry Of
Publisher: name: Columbia University
Year: 2019
Subjects: Mineral industries
Mineral industries--Government policy
Mineral industries--Economic aspects

description: At the request of the Colombian Government and with the support of Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ), CCSI prepared a policy brief focused on linkages from the mining sector in Colombia. The brief gives an overview of existing regulatory requirements, government policies and company programs to foster economic and infrastructure linkages. Based on the findings, the brief provides suggestions for next steps if the government is to develop a more comprehensive linkage creation program.
Measuring Gravitational Redshifts in Galaxy Clusters
Creators: name: Kaiser, Nick
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Wojtak {\it et al} have stacked 7,800 clusters from the SDSS survey in redshift space. They find a small net blue-shift for the cluster galaxies relative to the brightest cluster galaxies, which agrees quite well with the gravitational redshift from GR. Zhao {\it et al.} have pointed out that, in addition to the gravitational redshift, one would expect to see transverse Doppler (TD) redshifts, and that these two effects are generally of the same order. Here we show that there are other corrections that are also of the same order of magnitude. The fact that we observe galaxies on our past light cone results in a bias such that more of the galaxies observed are moving away from us in the frame of the cluster than are moving towards us. This causes the observed average redshift to be $\langle δz \rangle = -\langle Φ\rangle + \langle β^2 \rangle / 2 + \langle β_x^2 \rangle$, with $β_x$ is the line of sight velocity. That is if we average over galaxies with equal weight. If the galaxies in each cluster are weighted by their fluence, or equivalently if we do not resolve the moving sources, and make an average of the mean redshift giving equal weight per photon, the observed redshift is then opposite to the usual transverse Doppler effect. In the WHH experiment, the weighting is a step-function because of the flux-limit for inclusion in the spectroscopic sample and the result is different again, and depends on the details of the luminosity function and the SEDs of the galaxies. Including these effects substantially modifies the blue-shift profile. We show that in-fall and out-flow have very small effect over the relevant range of impact parameters but become important on larger scales.
description: accepted for publication in MNRAS
title: Occasionally Binding Constraints in Large Models: A Review of Solution Methods
Creators: name: Swarbrick, Jonathan
Publisher: name: Bank of Canada
Year: 2021

description: "Policy-makers use macroeconomic models to forecast the economy, analyze important events and assess the impact of key public (macroeconomic) policy actions. Detailed microeconomic featuressuch as decisions and interactions of firms and households—provide a rich theoretical foundation for the analysis. Solving complex models is difficult, and analysts often approximate the model by linearizing the equations.

Linearization makes the model easier to solve. But the benefits come at the loss of important details of the behaviour of people and businesses in the model economy. A common type of feature lost in this approximation is occasionally binding constraints (OBCs). Perhaps the best-known example of an OBC is the zero lower bound on nominal interest rates—the presence of a point beyond which the central bank would not further cut interest rates.

This paper considers various methods available to use with a linearized model to account for OBCs. Such accounting restores the important features associated with the model design. I show that all methods are broadly comparable, but dynareOBC (a tool kit used with the software Dynare) is faster and can be more accurate."

description: "Les autorités publiques emploient des modèles macroéconomiques pour prévoir l’évolution de l’économie, analyser de grands événements et évaluer l’impact des mesures (macroéconomiques) d’importance qu’elles prennent. Or, des éléments de nature microéconomique comme les décisions des ménages et des entreprises et leurs interactions apportent un riche fondement théorique à l’analyse. Résoudre des modèles complexes n’est pas une mince tâche, et les analystes procèdent souvent par approximation à l’aide de techniques de linéarisation des équations.

La linéarisation facilite la résolution des modèles, mais au prix d’une perte de détails importants concernant le comportement des gens et des entreprises dans l’économie modélisée. Les contraintes occasionnellement actives constituent un type courant d’éléments que cette méthode d’approximation ne permet pas de prendre en compte. L’exemple le plus connu de ce genre de contraintes est sans doute celui de la valeur plancher des taux d’intérêt nominaux, à savoir qu’il existe une valeur au-delà de laquelle la banque centrale ne voudra pas abaisser davantage les taux d’intérêt.

Cette étude analyse diverses méthodes susceptibles d’être employées pour tenir compte de ce genre de contraintes dans un modèle linéarisé. La prise en compte de ces contraintes permet de restituer les éléments importants associés à la conception du modèle. Je montre que toutes les méthodes sont globalement comparables, mais celle qui consiste à recourir à DynareOBC (gamme de programmes intégrés au logiciel Dynare) est plus rapide, et les résultats obtenus sont souvent plus précis."
title: Coral Reef Ecosystem Monitoring Report for the Pacific Remote Islands Marine National Monument 2000 - 2017: Chapter 3 Kingman Reef
Creators: name: Brainard, Russell
name: Acoba, Tomoko
name: Asher, Megan A.M.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: SP-19-006c
title: Coral Reef Ecosystem Monitoring Report for the Pacific Remote Islands Marine National Monument 2000-2017: Chapter 5 Wake Atoll
Creators: name: Brainard, Russell
name: Acoba, Tomoko
name: Asher, Megan A.M.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: SP-19-006e
Change Detection Meets Visual Question Answering
Creators: name: Yuan, Zhenghang
name: Mou, Lichao
name: Xiong, Zhitong
name: Zhu, Xiaoxiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The Earth's surface is continually changing, and identifying changes plays an important role in urban planning and sustainability. Although change detection techniques have been successfully developed for many years, these techniques are still limited to experts and facilitators in related fields. In order to provide every user with flexible access to change information and help them better understand land-cover changes, we introduce a novel task: change detection-based visual question answering (CDVQA) on multi-temporal aerial images. In particular, multi-temporal images can be queried to obtain high level change-based information according to content changes between two input images. We first build a CDVQA dataset including multi-temporal image-question-answer triplets using an automatic question-answer generation method. Then, a baseline CDVQA framework is devised in this work, and it contains four parts: multi-temporal feature encoding, multi-temporal fusion, multi-modal fusion, and answer prediction. In addition, we also introduce a change enhancing module to multi-temporal feature encoding, aiming at incorporating more change-related information. Finally, effects of different backbones and multi-temporal fusion strategies are studied on the performance of CDVQA task. The experimental results provide useful insights for developing better CDVQA models, which are important for future research on this task.
The origin and impact of Wolf-Rayet-type mass loss
Creators: name: Sander, Andreas A. C.
name: Vink, Jorick S.
name: Higgins, Erin R.
name: Shenar, Tomer
name: Hamann, Wolf-Rainer
name: Todt, Helge
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Classical Wolf-Rayet (WR) stars mark an important stage in the late evolution of massive stars. As hydrogen-poor massive stars, these objects have lost their outer layers, while still losing further mass through strong winds indicated by their prominent emission line spectra. Wolf-Rayet stars have been detected in a variety of different galaxies. Their strong winds are a major ingredient of stellar evolution and population synthesis models. Yet, a coherent theoretical picture of their strong mass-loss is only starting to emerge. In particular, the occurrence of WR stars as a function of metallicity (Z) is still far from being understood. To uncover the nature of the complex and dense winds of Wolf-Rayet stars, we employ a new generation of model atmospheres including a consistent solution of the wind hydrodynamics in an expanding non-LTE situation. With this technique, we can dissect the ingredients driving the wind and predict the resulting mass-loss for hydrogen-depleted massive stars. Our modelling efforts reveal a complex picture with strong, non-linear dependencies on the luminosity-to-mass ratio and Z with a steep, but not totally abrupt onset for WR-type winds in helium stars. With our findings, we provide a theoretical motivation for a population of helium stars at low Z, which cannot be detected via WR-type spectral features. Our study of massive He-star atmosphere models yields the very first mass-loss recipe derived from first principles in this regime. Implementing our first findings in stellar evolution models, we demonstrate how traditional approaches tend to overpredict WR-type mass loss in the young Universe.
description: 6 pages, 3 figures, to appear in the proceedings of IAUS 366 "The Origin of Outflows in Evolved Stars"
Two-dimensional S-matrices from unitarity cuts
Creators: name: Bianchi, Lorenzo
name: Forini, Valentina
name: Hoare, Ben
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using unitarity methods, we compute, for several massive two-dimensional models, the cut-constructible part of the one-loop 2->2 scattering S-matrices from the tree-level amplitudes. We apply our method to various integrable theories, finding evidence that for supersymmetric models the one-loop S-matrix is cut-constructible, while for models without supersymmetry (but with integrability) the missing rational terms are proportional to the tree-level S-matrix and therefore can be interpreted as a shift in the coupling. Finally, applying our procedure to the world-sheet theory for the light-cone gauge-fixed AdS_5 x S^5 superstring we reproduce, at one-loop in the near-BMN expansion, the S-matrix known from integrability techniques.
description: 23 pages, 1 figure; v2: 24 pages, minor corrections, reference and note added; v3: minor typos corrected
Universal hadronization condition in heavy ion collisions at $\sqrt{s_\mathrm{NN}}= 62$ GeV and at $\sqrt{s_\mathrm{NN}}=2.76$ TeV
Creators: name: Petran, Michal
name: Rafelski, Johann
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We obtain a detailed description of all available hadron multiplicity yields in central Pb--Pb collisions at LHC measured in the rapidity interval $|y|<0.5$. We find that the hadronization of the fireball at LHC occurs at nearly identical intensive physical bulk conditions for all centralities similar to those seen already at RHIC.
description: 5 pages, 4 figures