cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Performance and calibration of the NIKA camera at the IRAM 30 m telescope
Creators: name: Catalano, A.
name: Calvo, M.
name: Ponthieu, N.
name: Adam, R.
name: Adane, A.
name: Ade, P.
name: Andre, P.
name: Beelen, A.
name: Belier, B.
name: Benoit, A.
name: Bideaud, A.
name: Billot, N.
name: Boudou, N.
name: Bourrion, O.
name: Coiffard, G.
name: Comis, B.
name: D'Addabbo, A.
name: Desert, F. -X.
name: Doyle, S.
name: Goupy, J.
name: Kramer, C.
name: Leclercq, S.
name: Macias-Perez, J. F.
name: Martino, J.
name: Mauskopf, P.
name: Mayet, F.
name: Monfardini, A.
name: Pajot, F.
name: Pascale, E.
name: Perotto, L.
name: Reveret, V.
name: Rodriguez, L.
name: Savini, G.
name: Schuster, K.
name: Sievers, A.
name: Tucker, C.
name: Zylka, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The New IRAM KID Array (NIKA) instrument is a dual-band imaging camera operating with Kinetic Inductance Detectors (KID) cooled at 100 mK. NIKA is designed to observe the sky at wavelengths of 1.25 and 2.14 mm from the IRAM 30 m telescope at Pico Veleta with an estimated resolution of 13\,arcsec and 18 arcsec, respectively. This work presents the performance of the NIKA camera prior to its opening to the astrophysical community as an IRAM common-user facility in early 2014. NIKA is a test bench for the final NIKA2 instrument to be installed at the end of 2015. The last NIKA observation campaigns on November 2012 and June 2013 have been used to evaluate this performance and to improve the control of systematic effects. We discuss here the dynamical tuning of the readout electronics to optimize the KID working point with respect to background changes and the new technique of atmospheric absorption correction. These modifications significantly improve the overall linearity, sensitivity, and absolute calibration performance of NIKA. This is proved on observations of point-like sources for which we obtain a best sensitivity (averaged over all valid detectors) of 40 and 14 mJy.s$^{1/2}$ for optimal weather conditions for the 1.25 and 2.14 mm arrays, respectively. NIKA observations of well known extended sources (DR21 complex and the Horsehead nebula) are presented. This performance makes the NIKA camera a competitive astrophysical instrument.
title: Selbstlernphasen – ein wichtiger Bestandteil JEDER Lehrveranstaltung
Creators: name: Rottmeier, Stephanie
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Der Beitrag spricht die Gestaltung von Selbstlernphasen an: Insbesondere, welche Fragen Dozierende bei der Planung vorab für sich beantworten und was sie bei der Entwicklung der Lernumgebung einer Selbstlernphasen berücksichtigt sollten.
Instabilities and Anti-Evaporation of Reissner-Nordström Black Holes in modified $F(R)$ gravity
Creators: name: Nojiri, Shin'ichi
name: Odintsov, Sergei D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the instabilities and related anti-evaporation of the extremal Reissner-Nordström (RN) black hole in $F(R)$ gravity. It is remarkable that the effective electric charge can be generated for some solutions of $F(R)$ gravity without electromagnetic field. The anti-evaporation effect occurs but it emerges only in the strong coupling limit of the effective gravitational coupling. The instabilities of RN black hole are also investigated when the electromagnetic sector is added to the action of $F(R)$ gravity. We show the anti-evaporation occurs in the Maxwell-$F(R)$ gravity with the arbitrary gravitational coupling constant although it does not occur in the Maxwell-Einstein gravity. Furthermore, general spherically-symmetric solution of $F(R)$ gravity in the Einstein frame is obtained.
description: LaTeX 11 pages, no figure, publication data: Physics Letters B 735, 376-382 (2014)
Alabama Extension Commercial Horticulture Virtual Events and Social Media Evaluation System During the COVID-19 Pandemic
Creators: name: Majumdar, Ayanava
name: Willis, Harli
name: Chaves-Cordoba, Bernardo
name: Chambliss, Ann
name: Majumdar, Ayanava
Publisher: name: National Association of County Agricultural Agents
Year: 2022
Subjects: social media events
virtual events
cooperative extension

description: Alabama has a rapidly growing specialty crop industry valued at $165 million in direct sale and $103 million in value-added products. The demand for fresh fruits and vegetables remained high during the COVID-19 pandemic. To support producers with timely information, the Alabama Extension Commercial Horticulture Team used three different social media (SM) events along with a unique monitoring and evaluation system as formative evaluations. Overall, 120 virtual events via a Facebook channel and a farmer group page reached 2,271 direct and 57,000 indirect participants with many new clients and beginning farmers that found the information useful and timely.
Présentation du Projet européen CORTEX
Creators: name: Pantera, Laurent
Publisher: name: Zenodo
Year: 2019
Subjects: CORTEX

description: Presentation of the CORTEX project at the Seminar “Nouvelles Technologies d’Instrumentation pour l’Energie Nucléaire“, CEA Cadarache, Saint-Paul-lez-Durance, France, November 13-14, 2019.
Combining simulations and machine learning for neutron noise-based core diagnostics
Creators: name: Demazière, Christophe
Publisher: name: Zenodo
Year: 2021

description: Introduction and background Fluctuations could be used for “diagnostics”, i.e.: • Early detection of anomalies • Estimation of dynamical system characteristics … even if the system is operating at steady-state conditions Fluctuations in the neutron density in nuclear reactors can be used for core diagnostics and monitoring
Polarized WW Scattering on the Higgs Pole
Creators: name: Brehmer, Johann
name: Jaeckel, Joerg
name: Plehn, Tilman
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Higgs discovery has given us the Higgs-gauge sector as a new handle to search for physics beyond the Standard Model. This includes physics scenarios originally linked to massive gauge boson scattering at high energies. We investigate how one can separately probe the Higgs couplings to the longitudinal and transverse parts of the massive gauge bosons away from this high-energy limit. Deviations from the Standard Model could originate from higher-dimensional operators, compositeness, or even more fundamentally from a violation of gauge invariance. The signature we propose is the tagging jet kinematics in weak boson scattering for scattering energies close to the Higgs resonance. During the upcoming LHC run at 13 TeV we will be able to test these couplings at the 20% level.
description: 20 pages, 11 figures, 2 tables. v2: minor changes, matches version to appear in PRD
Residual Finiteness Growths of Virtually Special Groups
Creators: name: Bou-Rabee, Khalid
name: Hagen, Mark F.
name: Patel, Priyam
Publisher: name: arXiv
Year: 2014
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Let $G$ be a virtually special group. Then the residual finiteness growth of $G$ is at most linear. This result cannot be found by embedding $G$ into a special linear group. Indeed, the special linear group $\text{SL}_k(\mathbb{Z})$, for $k > 2$, has residual finiteness growth $n^{k-1}$.
description: Updated version contains minor changes incorporating referee comments/suggestions and a simplified proof of Lemma 4.1
Lorentzian spectral geometry for globally hyperbolic surfaces
Creators: name: Finster, Felix
name: Müller, Olaf
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 510 Mathematik

description: The fermionic signature operator is analyzed on globally hyperbolic Lorentzian surfaces. The connection between the spectrum of the fermionic signature operator and geometric properties of the surface is studied. The findings are illustrated by simple examples and counterexamples.
Orbital magnetization of correlated electrons with arbitrary band topology
Creators: name: Nourafkan, R.
name: Kotliar, G.
name: Tremblay, A. -M. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spin-orbit coupling introduces chirality into electronic structure. This can have profound effects on the magnetization induced by orbital motion of electrons. Here we derive a formula for the orbital magnetization of interacting electrons in terms of the full Green's function and vertex functions. The formula is applied within dynamical mean-field theory to the Kane-Mele-Hubbard model that allows both topological and trivial insulating phases. We study the insulating and metallic phases in the presence of an exchange magnetic field. In the presence of interactions, the orbital magnetization of the quantum spin Hall insulating phase with inversion symmetry is renormalized by the bulk quasi-particle weight. The orbital magnetization vanishes for the in-plane antiferromagnetic phase with trivial topology. In the metallic phase, the enhanced effective spin-orbit coupling due to the interaction sometimes leads to an enhancement of the orbital magnetization. However, at low doping, magnetization is suppressed at large interaction strengths.
description: arXiv admin note: text overlap with arXiv:1211.1774 by other authors
Helioseismology and Asteroseismology: Looking for Gravitational Waves in acoustic oscillations
Creators: name: Lopes, Ilídio
name: Silk, Joseph
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Current helioseismology observations allow the determination of the frequencies and surface velocity amplitudes of solar acoustic modes with exceptionally high precision. In some cases, the frequency accuracy is better than one part in a million. We show that there is a distinct possibility that the quadrupole acoustic modes of low order could be excited by gravitational waves (GWs), if the GWs have a strain amplitude in the range $10^{-20}h_{-20}$ with $h_{-20}\sim 1$ or $h_{-20}\sim 10^{3}$, as predicted by several types of GW sources, such as galactic ultracompact binaries or extreme mass ratio inspirals and coalescence of black holes. If the damping rate at low order is $ 10^{-3}η_N$ $μ{\rm Hz}$, with $η_N\sim 10^{-3} $ - $1,$ as inferred from the theory of stellar pulsations, then GW radiation will lead to a maximum rms surface velocity amplitude of quadrupole modes of the order of $h_{-20}η_N^{-1}\sim$ $10^{-9}$ - $10^{-3}$ ${\rm cm\; s^{-1}}$, on the verge of what is currently detectable via helioseismology. The frequency and sensitivity range probed by helioseismological acoustic modes overlap with, and complement, the capabilities of eLISA for the brightest resolved ultracompact galactic binaries.
description: 8 pages, 1 table and 4 figures, updated bibliography. The article was reviewed following the comments and suggestions made by several colleagues
DGP with bubble of nothing
Creators: name: Izumi, Keisuke
name: Shiromizu, Tetsuya
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct exact solutions with the bubble of nothing in the Dvali-Gabadadze-Porrati braneworld model. The configuration with a single brane can be constructed, unlike in the Randall-Sundrum braneworld model. The geometry on the single brane looks like the Einstein-Rosen bridge. We also discuss the junction of multibranes. Surprisingly, even without any artificial matter fields on the branes such as three-dimensional tension of the codimension-two objects, two branes can be connected in certain configurations. We investigate solutions of multibranes too. The presence of solutions may indicate the semiclassical instability of the models.
description: Version accepted by PRD (v2): 9 pages, 13 figures
Stable finite element approximations of two-phase flow with soluble surfactant
Creators: name: Barrett, John W.
name: Garcke, Harald
name: Nürnberg, Robert
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: incompressible two-phase flow, soluble surfactants, finite elements, front tracking, ALE-ESFEM
subject: 510 Mathematik

description: A parametric finite element approximation of incompressible two-phase flow with soluble surfactants is presented. The Navier–Stokes equations are coupled to bulk and surfaces PDEs for the surfactant concentrations. At the interface adsorption, desorption and stress balances involving curvature effects and Marangoni forces have to be considered. A parametric finite element approximation for the advection of the interface, which maintains good mesh properties, is coupled to the evolving surface finite element method, which is used to discretize the surface PDE for the interface surfactant concentration. The resulting system is solved together with standard finite element approximations of the Navier–Stokes equations and of the bulk parabolic PDE for the surfactant concentration. Semidiscrete and fully discrete approximations are analyzed with respect to stability, conservation and existence/uniqueness issues. The approach is validated for simple test cases and for complex scenarios, including colliding drops in a shear flow, which are computed in two and three space dimensions.
17O-NMR Knight shift study of the interplay between superconductivity and pseudogap in (Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y
Creators: name: Cvitanic, T.
name: Pelc, D.
name: Pozek, M.
name: Amit, E.
name: Keren, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report systematic 17O-NMR measurements on the high-Tc cuprate (Ca_xLa_{1-x})(Ba_{1.75 - x}La_{0.25 + x})Cu_3O_y, for four different families (different x). Using Knight shift data, we show that the pseudogap lines for all families are inconsistent with a quantum critical point inside the superconducting dome. In addition, at constant doping the pseudogap temperature does not vary with x, in contrast to Tc. We therefore argue that pseudogap and superconductivity are separate phenomena in these cuprates. Using Knight shift data, we show that the pseudogap opening temperature T* is much higher than Tc near optimal doping, unlike structurally similar YBCO. In addition, at constant doping the pseudogap temperature does not vary with x, in contrast to Tc. This puts constraints on the nature of the pseudogap and position of the quantum critical point inside the superconducting dome.
description: 6 pages
A stable numerical method for the dynamics of fluidic membranes
Creators: name: Barrett, John W.
name: Garcke, Harald
name: Nürnberg, Robert
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: fluidic membranes, incompressible two-phase flow, parametric finite elements, virtual element method, Helfrich energy, Boussinesq–Scriven surface fluid, local surface area conservation
subject: 510 Mathematik
subject: 65M60
subject: 65M12
subject: 76M10
subject: 76Z99
subject: 92C05
subject: 35Q35
subject: 76D05

description: We develop a finite element scheme to approximate the dynamics of two and three dimensional fluidic membranes in Navier–Stokes flow. Local inextensibility of the membrane is ensured by solving a tangential Navier–Stokes equation, taking surface viscosity effects of Boussinesq–Scriven type into account. In our approach the bulk and surface degrees of freedom are discretized independently, which leads to an unfitted finite element approximation of the underlying free boundary problem. Bending elastic forces resulting from an elastic membrane energy are discretized using an approximation introduced by Dziuk (2008). The obtained numerical scheme can be shown to be stable and to have good mesh properties. Finally, the evolution of membrane shapes is studied numerically in different flow situations in two and three space dimensions. The numerical results demonstrate the robustness of the method, and it is observed that the conservation properties are fulfilled to a high precision.
Know Your 5 - Brambles
Creators: name: Hardy, Spencer
Publisher: name: figshare
Year: 2023
Subjects: Horticultural production not elsewhere classified

description: UVM Extension and the Vermont Center for Ecostudies have been working on some “Know Your 5” pollinator guides as part of a newly formed Vermont Pollination Working Group. These guides cover some important pollinators for, and supported by, commercially grown crops in Vermont.
title: Innovation in der Hochschullehre
Creators: name: Bachmaier, Regine
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Im Podcast erläutert Dr. Birgit Hawelka, was es mit Innovation in der Hochschullehre auf sich hat, welche Treiber Innovation fördern und welche Grenzen und Vorgaben sie behindern. Ebenfalls geht sie auf die Rolle der Studierenden in diesem Prozess ein.
Pre-inflationary genesis with CMB B-mode polarization
Creators: name: Liu, Zhi-Guo
name: Li, Hong
name: Piao, Yun-Song
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent B-mode polarization observation seems to imply the tensor tilt $n_T\gtrsim 1$ at large angular scale, if the primordial signal is dominated. We show that for a primordial universe, which is in a slowly expanding genesis phase before the slow-roll inflation, the primordial tensor spectrum will get a large-scale cutoff, i.e. $n_T\gtrsim 1$ at large scales while $n_T\simeq 0$ at small scale. We find that this inflationary scenario not only may be consistent with the observation, but also predicts a large-scale anomaly in BB power spectrum, i.e. due to the large suppression of tensor perturbation amplitude we will hardly see the reionization bump at low-$l$, which may be falsified by the Planck polarization data.
description: minor changes, in PRD
The spinoral energy functional on surfaces
Creators: name: Ammann, Bernd
name: Weiss, Hartmut
name: Witt, Frederik
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 510 Mathematik

description: This is a companion paper to [1] where we introduced the spino- rial energy functional and studied its main properties in dimensions equal or greater than three. In this article we focus on the surface case. A salient feature here is the scale invariance of the functional which leads to a plenitude of critical points. Moreover, via the spinorial Weierstraß representation it relates to the Willmore energy of periodic immersions of surfaces into R3.
Using active learning in hybrid learning environments
Creators: name: Demazière, Christophe
Publisher: name: Zenodo
Year: 2020

description: With overall declining student enrolments in nuclear engineering programs in Europe, being able to maintain highly specialized courses alive has become a challenge. As a possible remedy to such a situation, efforts have been pursued at Chalmers University of Technology, Gothenburg, Sweden to offer short courses in “hybrid” learning environments. In this paper, a hybrid environment is defined as a learning environment that combines on-site and off-site attendees while preserving full interaction possibilities between both audiences and between each audience and the teacher. Although there is no formal limit between how many on-site versus off-site students there should be, the incentive of the course offering would still be to attract as many as possible on-site attendees, so that synchronous interactions are face-to-face and thus more natural.
 In order to make this possible, a special interactive teaching room was developed at the Department of Physics and allows both audiences to share audio, video and digital contents [1]. This room is furnished with movable chairs, tables and whiteboards, also enabling the use of a more student-centered pedagogical approach. In addition, the room is equipped with audio and video hardware and software. The core of the system is driven by a high-end tablet PC running web-based conferencing tools and connected to the room hardware. The audio/video equipment allows synchronous interactions between the on-site and off-site participants in form of digital content sharing, audio interactions, and video communication.
 Beyond the design of the room, emphasis was put on favouring student learning, building upon the use of active learning techniques. Active learning techniques were demonstrated to lead to much better learning outcomes and to contribute to a deeper approach to learning compared to traditional teaching approaches [4]. In order to maximize the time when the teacher and the students meet, either face-to-face (for the on-site attendees) or on the web (for the off-site attendees), a flipped classroom pedagogy was followed [2, 3]. In the flipped classroom model, students are asked to do some preparatory work before attending the in-class sessions. In this asynchronous learning phase, the students can choose when and at what pace to study the preparatory course material. The time spent with the teachers can then be used more effectively to engage students in more active forms of learning.
 Nevertheless, designing activities favouring student engagement is particularly challenging in hybrid learning environments, when both on-site and off-site audiences are mixed. This paper reports on two short courses arranged along the lines above and assesses the efficacy of the synchronous sessions in terms of student engagement, based on both the teacher’s and the students’ perspectives, for the latter using anonymous course evaluation questionnaires.
title: A(dvance) & O(rganizer) für einen guten Überblick
Creators: name: Neger, Thomas
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Mit Hilfe der Methode "Advance Organizer" lässt sich ein lern- und verständnisfördernder Überblick über Zusammenhänge und inhaltliche Schwerpunkte einer Lehrveranstaltung erzeugen, der auch Lernziele und Tätigkeiten der Teilnehmenden einbezieht und im Kursverlauf hilft, neue Inhalte richtig einzuordnen.
Parametrizing the transition to the phantom epoch with Supernovae Ia and Standard Rulers
Creators: name: Leanizbarrutia, Iker
name: Sáez-Gómez, Diego
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The reconstruction of a (non)canonical scalar field Lagrangian from the dark energy Equation of State (EoS) parameter is studied, where it is shown that any EoS parametrization can be well reconstructed in terms of scalar fields. Several examples of EoS parameters are studied and the particular scalar field Lagrangian is reconstructed. Then, we propose some new parametrizations that may present a (fast) transition to a phantom dark energy EoS (where $w_{DE}
description: 19 pages, 9 figures. Analysis extended, version published in Phys. Rev. D
Bernhard Emunds; Stephan Goertz, unter Mitarbeit von Julian Degan und Prisca Patenge, Kirchliches Vermögen unter christlichem Anspruch (Katholizismus im Umbruch 11), Freiburg - Basel - Wien: Herder 2020
Creators: name: Ostheimer, Jochen
Publisher: name: Münchener Theologische Zeitschrift
Year: 2023

description: Münchener Theologische Zeitschrift, Bd. 72 Nr. 4 (2021)
Lp-spectrum of the Dirac operator on products with hyperbolic spaces
Creators: name: Ammann, Bernd
name: Grosse, Nadine
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Dirac operator, Lp-spectrum, Green function, hyperbolic space, product spaces
subject: 510 Mathematik
subject: 58J50
subject: 34B27

description: We study the Lp-spectrum of the Dirac operator on complete manifolds. One of the main questions in this context is whether this spectrum depends on p. As a first example where p-independence fails we compute explicitly the Lp-spectrum for the hyperbolic space and its product with compact spaces.
title: Stumpfes Auswendiglernen muss nicht sein – wie Visualisierungen helfen können
Creators: name: Biehl, Stefanie
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Der Blogbeitrag erklärt, wie man die Methode des Schreibens und Lernens von Karteikarten mit Hilfe kreativer Visualisierungen modernisieren kann.
Using quantum routers to implement quantum message authentication and Bell-state manipulation
Creators: name: Bartkiewicz, Karol
name: Černoch, Antonín
name: Lemr, Karel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper we investigate the capability of quantum routing (quantum state fusion) to implement two useful quantum communications protocols. The analyzed protocols include quantum authentication of quantum messages and non-destructive linear-optical Bell state manipulation. We also present the concept of quantum decoupler -- a device implementing an inverse operation to quantum routing. We demonstrate that both quantum router and decoupler can work as specialized disentangling gates.
description: 10 pages, 7 figures
Applying a phase field approach for shape optimization of a stationary Navier-Stokes flow
Creators: name: Garcke, Harald
name: Hecht, Claudia
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Shape and topology optimization, phase field method, diffuse interfaces,stationary Navier-Stokes flow, fictitious domain
subject: 510 Mathematik
subject: 35R35
subject: 35Q35
subject: 49Q10
subject: 49Q12
subject: 49Q20
subject: 76D05
subject: 76N10

description: We apply a phase field approach for a general shape optimization problem of a stationary Navier-Stokes flow. To be precise we add a multiple of the Ginzburg{Landau energy as a regularization to the objective functional and relax the non-permeability of the medium outside the fluid region. The resulting diffuse interface problem can be shown to be well-posed and optimality conditions are derived. We state suitable assumptions on the problem in order to derive a sharp interface limit for the minimizers and the optimality conditions. Additionally, we can derive a necessary optimality system for the sharp interface problem by geometric variations without stating additional regularity assumptions on the minimizing set.
title: Mehr als “Gut gemacht!” – 7 Prinzipien guten Feedbacks
Creators: name: Rottmeier, Stephanie
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Gutes Feedback geben ist eine Kernkompetenz von Dozierenden. Der Beitrag stellt 7 Tipps für gutes Feedback vor.
title: Vortrag mit Tafel: Digitale Umsetzung mit Explain Everything
Creators: name: Bachmaier, Regine
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Der Blogbeitrag zeigt, wie tafelunterstützte Vorträge mit Hilfe von "Explain Everything" unkompliziert als Lehrvideo umgesetzt werden können.
Dejar el petróleo bajo tierra: Yasuní como ejemplo y como aprendizahe en transiciones postextractivistas
Creators: name: Gudynas, Eduardo
Publisher: name: Zenodo
Year: 2023
Subjects: ecología política
postextractivismo
transiciones
petróleo

description: Análisis desde la ecología política de elementos destacados en la iniciativa, en Ecuador, se mantener el petróleo bajo tierra en la zona del ITT Yasuní. Esa iniciativa está repleta de ideas, historias y acciones que al ser analizadas brindan ejemplos y lecciones.
PRINCIPLES OF INDUSTRIAL RELATIONS DISPUTE RESOLUTION THROUGH MEDIATION
Creators: name: BUDHI HERDI SUSIANTO
name: RETNO SARASWATI
name: FIFIANA WISNAENI
Publisher: name: Zenodo
Year: 2023
Subjects: Protection, Consumers, Electronics, Online, Transactions.

description: Abstract
This study aims to analyze the online trading arrangements based on Law Number 8 of 1999 concerning consumer protection and Law Number 19 of 2016 concerning amendments to Law Number 11 of 2008 concerning electronic information and transactions. The method used is normative juridical. The results show that legal protection for online shopping consumers can be provided in terms of legal certainty as stipulated in the laws and regulations governing online shopping, namely Law Number 19 of 2016 concerning Amendments to Law No. 11 of 2008 concerning Electronic Transaction Information in conjunction with Law No. 8 of 1999 concerning Consumer Protection. The existence of an electronic contract as regulated in Article 18 (1) of the ITE Law is recognized and has the same position as a conventional sale and purchase contract. Through electronic contracts, consumers can sue business actors if a dispute arises due to the electronic transaction.
Orthogonal polynomials for Minkowski's question mark function
Creators: name: Dresse, Zoé
name: Van Assche, Walter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42C05, 11A45, 11B57, 65Q30

description: Hermann Minkowski introduced a function in 1904 which maps quadratic irrational numbers to rational numbers and this function is now known as Minkowski's question mark function since Minkowski used the notation $?(x)$. This function is a distribution function on $[0,1]$ which defines a singular continuous measure with support $[0,1]$. Our interest is in the (monic) orthogonal polynomials $(P_n)_{n \in \mathbb{N}}$ for the Minkowski measure and in particular in the behavior of the recurrence coefficients of the three term recurrence relation. We will give some numerical experiments using the discretized Stieltjes-Gautschi method with a discrete measure supported on the Minkowski sequence. We also explain how one can compute the moments of the Minkowski measure and compute the recurrence coefficients using the Chebyshev algorithm.
description: 26 pages, 11 figures, 4 tables
ON THE INFLUENCE OF THE MOMENTUM THICKNESS ON STREAMWISE JET INSTABILITIES
Creators: name: Jaramillo Pizarro, Guillermo A.
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: Aerospace engineering not elsewhere classified

description: Different techniques have been employed through the years to predict hydrodynamic instabilities on high speed liquid jets. In this work, a local linear stability analysis (LSA) has been chosen to estimate streamwise wavelengths on the jet surface near the jet exit. Data for 0.24 to 0.5 diameters downstream in a high speed water jet issuing into air, given by Reynolds number based momentum thickness between 240 and 600, for validation of the method. The hypothesis is: near the exit of the jet nozzle, for high speed liquid jets, the local velocity profile evolves based on the momentum thickness and, because of large inertia effects, the flow may be considered as inviscid for instability purposes. Therefore, the approach in this work is based on the Rayleigh equation and with the momentum thickness scaling, both non-dimensional and dimensional values of the most unstable wavelengths are obtained. The key aspect of the approach is the relevance of the momentum thickness as the scaling factor for calculation purposes on dimensional values of wavelengths. Also, a hyperbolic tangent velocity profile is assumed for the Linear Stability Analysis based on the Rayleigh equation. Numerical restrictions and comparisons, using the Riccati transformation, are specified and described in detail to generalize this approach. Results show that analytical estimates of the most unstable streamwise wavelengths are close to the experimental measurements published by Portillo et al. in 2011. The agreement using this new approach is often within the experimental uncertainty.
A semigroup-theoretical view of direct-sum decompositions and associated combinatorial problems
Creators: name: Baeth, Nicholas R.
name: Geroldinger, Alfred
name: Grynkiewicz, David J.
name: Smertnig, Daniel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Commutative Algebra (math.AC)
subject: Combinatorics (math.CO)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 11B30, 11P70, 13F05, 16D70, 16E60, 16P40, 20M13

description: Let $R$ be a ring and let $\mathcal C$ be a small class of right $R$-modules which is closed under finite direct sums, direct summands, and isomorphisms. Let $\mathcal V (\mathcal C)$ denote a set of representatives of isomorphism classes in $\mathcal C$ and, for any module $M$ in $\mathcal C$, let $[M]$ denote the unique element in $\mathcal V (\mathcal C)$ isomorphic to $M$. Then $\mathcal V (\mathcal C)$ is a reduced commutative semigroup with operation defined by $[M] + [N] = [M \oplus N]$, and this semigroup carries all information about direct-sum decompositions of modules in $\mathcal C$. This semigroup-theoretical point of view has been prevalent in the theory of direct-sum decompositions since it was shown that if $\operatorname{End}_R (M)$ is semilocal for all $M\in \mathcal C$, then $\mathcal V (\mathcal C)$ is a Krull monoid. Suppose that the monoid $\mathcal V (\mathcal C)$ is Krull with a finitely generated class group (for example, when $\mathcal C$ is the class of finitely generated torsion-free modules and $R$ is a one-dimensional reduced Noetherian local ring). In this case we study the arithmetic of $\mathcal V (\mathcal C)$ using new methods from zero-sum theory. Furthermore, based on module-theoretic work of Lam, Levy, Robson, and others we study the algebraic and arithmetic structure of the monoid $\mathcal V (\mathcal C)$ for certain classes of modules over Prüfer rings and hereditary Noetherian prime rings.
description: 42 pages; to appear in the Journal of Algebra and its Applications
Sharp interface limit for a phase field model in structural optimization
Creators: name: Blank, Luise
name: Garcke, Harald
name: Hecht, Claudia
name: Rupprecht, Christoph
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Shape and topology optimization, linear elasticity, sensitivity analysis, optimality conditions, T-convergence, phase field method, diffuse interface, numerical simulations
subject: 510 Mathematik
subject: 35Q74
subject: 35R35
subject: 49Q10
subject: 49Q12
subject: 74B05
subject: 74Pxx

description: We formulate a general shape and topology optimization problem in structural optimization by using a phase field approach. This problem is considered in view of well-posedness and we derive optimality conditions. We relate the diffuse interface problem to a perimeter penalized sharp interface shape optimization problem in the sense of T-convergence of the reduced objective functional. Additionally, convergence of the equations of the first variation can be shown. The limit equations can also be derived directly from the problem in the sharp interface setting. Numerical computations demonstrate that the approach can be applied for complex structural optimization problems.
title: Was ist gute Hochschullehre
Creators: name: Hawelka, Birgit
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Was sind Qualitätskriterien guter Hochschullehre? Welche Dimensionen des Lehrverhaltens wirken positiv auf den Lernprozess von Studierenden?
The continuum limit of a fermion involving leptons and quarks: Strong, electroweak and gravitational interactions
Creators: name: Finster, Felix
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 510 Mathematik

description: The causal action principle is analyzed for a system of relativistic fermions composed of massive Dirac particles and neutrinos. In the continuum limit, we obtain an effective interaction described by classical gravity as well as the strong and electroweak gauge fields of the standard model.
Uprising African swine fever: Prevention and control
Creators: name: Navrose Sangha1 and Barinder Singh2
Publisher: name: The Science world a Monthly e magazine
Year: 2023

description: Recently, African swine fever (ASF) has extended from sub-Saharan Africa to the Trans-Caucasus region, Eastern Europe, and portions of the Russian Federation. There are notable parallels between the disease and the African context in this new epidemiological scenario, but there are also notable distinctions, such as the significant role of wild boar. Gaining further insight into this novel scenario will facilitate enhanced management and stop the spread of illness. This page compares these various circumstances and provides up-to-date information on the immunological response to infection, the pathophysiology of ASF virus strains, and the potential for vaccine development. There is a discussion of knowledge gaps and future control chances.
title: Motiviert lernen – wie kann ich meine Studierenden dabei unterstützen?
Creators: name: Rottmeier, Stephanie
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik, Universität Regensburg
Year: 2021

description: Lernmotivation als einer der entscheidenden Einflüsse von studentischem Lernerfolg lässt sich durch verschiedene Faktoren unterstützen, die Dozierende bei der Planung und Gestaltung ihrer Lehre berücksichtigen sollten.
title: Videos in der Hochschullehre: mehr als emergency remote teaching
Creators: name: Hawelka, Birgit
Publisher: name: Zentrum für Hochschul- und Wissenschaftsdidaktik
Year: 2021

description: Gründe für den Einsatz von Videos in der Hochschullehre und warum diese insbesondere die Präsenzlehre bereichern können.
Nonparametric Option Pricing with Generalized Entropic Estimators
Creators: name: Almeida, Caio
name: Freire, Gustavo
name: Azevedo, Rafael
name: Ardison, Kym
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: We propose a family of nonparametric estimators for an option price that require only the use of underlying return data, but can also easily incorporate information from observed option prices. Each estimator comes from a risk-neutral measure minimizing generalized entropy according to a different Cressie–Read discrepancy. We apply our method to price S&P 500 options and the cross-section of individual equity options, using distinct amounts of option data in the estimation. Estimators incorporating mild nonlinearities produce optimal pricing accuracy within the Cressie–Read family and outperform several benchmarks such as Black–Scholes and different GARCH option pricing models. Overall, we provide a powerful option pricing technique suitable for scenarios of limited option data availability.
Involvement of cyclic guanosine monophosphate-dependent protein kinase I in renal antifibrotic effects of serelaxin
Creators: name: Schlossmann, Jens
name: Wetzl, Veronika
name: Schinner, Elisabeth
name: Kees, Frieder K.
name: Hofmann, Franz
name: Faerber, Lothar
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: UNILATERAL URETERAL OBSTRUCTION; RELAXIN FAMILY PEPTIDES; TISSUE GROWTH-FACTOR; INTERSTITIAL FIBROSIS; NITRIC-OXIDE; TGF-BETA; TUBULOINTERSTITIAL FIBROSIS; HEART-FAILURE; MATRIX METALLOPROTEINASES; HYPERTENSIVE-RATS; Relaxin; serelaxin; cGMP-dependent protein kinase; kidney; interstitial fibrosis; signaling; nitric oxide
subject: 615 Pharmazie

description: Introduction: Kidney fibrosis has shown to be ameliorated through the involvement of cyclic guanosine monophosphate (cGMP) and its dependent protein kinase I (cGKI). Serelaxin, the recombinant form of human relaxin-II, increases cGMP levels and has shown beneficial effects on kidney function in acute heart failure patients. Antifibrotic properties of serelaxin are supposed to be mediated via relaxin family peptide receptor 1 and subsequently enhanced nitric oxide/ cGMP to inhibit transforming growth factor 1)) (TGFI)) signaling. This study examines the involvement of cGKI in the antifibrotic signaling of serelaxin. Methods and Results: Kidney fibrosis was induced by unilateral ureteral obstruction in wildtype (WT) and cGKI knock-out (KO) mice. After 7 days, renal antifibrotic effects of serelaxin were assessed. Serelaxin treatment for 7 days significantly increased cGMP in the kidney of WT and cGKI-KO. In WT, renal fibrosis was reduced through decreased accumulation of collagenl A1, total collagen, and fibronectin. The profibrotic connective tissue growth factor as well as myofibroblast differentiation were reduced and matrix metalloproteinases-2 and-9 were positively modulated after treatment. Moreover, Smad2 as well as extracellular signal-regulated kinase 1 (ERK1) phosphorylation were decreased, whereas phosphodiesterase (PDE) 5a phosphorylation was increased. However, these effects were not observed in cGKI-KO. Conclusion: Antifibrotic renal effects of serelaxin are mediated via cGMP/cGKI to inhibit Smad2- and ERK1-dependent TGF-13 signaling and increased PDE5a phosphorylation.
Electric field control of multiferroic domain wall motion
Creators: name: Chen, Hong-Bo
name: Liu, Ye-Hua
name: Li, You-Quan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The dynamics of a multiferroic domain wall in which an electric field can couple to the magnetization via inhomogeneous magnetoelectric interaction is investigated by the collective-coordinate framework. We show how the electric field is capable of delaying the onset of the Walker breakdown of the domain wall motion, leading to a significant enhancement of the maximum wall velocity. Moreover, we show that in the stationary regime the chirality of the domain wall can be efficiently reversed when the electric field is applied along the direction of the magnetic field. These characteristics suggest that the multiferroic domain wall may provide a new prospective means to design faster and low-power-consumption domain wall devices.
description: 6 pages, 4 figures
Nonparametric Option Pricing with Generalized Entropic Estimators*
Creators: name: Almeida, Caio
name: Freire, Gustavo
name: Azevedo, Rafael
name: Ardison, Kym
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: We propose a family of nonparametric estimators for an option price that require only the use of underlying return data, but can also easily incorporate information from observed option prices. Each estimator comes from a risk-neutral measure minimizing generalized entropy according to a different Cressie-Read discrepancy. We apply our method to price S&P 500 options and the cross-section of individual equity options, using distinct amounts of option data in the estimation. Estimators incorporating mild nonlinearities produce optimal pricing accuracy within the Cressie-Read family and outperform several benchmarks such as Black-Scholes and different GARCH option pricing models. Overall, we provide a powerful option pricing technique suitable for scenarios of limited option data availability.
Assessing the accuracy of sentiment analysis of social media posts at small and medium-sized enterprises in Southern Germany
Creators: name: Schwaiger, Josef Michael
name: Lang, Markus
name: Ritter, Christian
name: Johannsen, Florian
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: Social Media; sentiment analysis; small and medium-sized enterprises
subject: 004 Informatik

description: In recent years, small and medium-sized enterprises (SMEs) have increasingly adopted Social Media technologies with the purpose of fostering the bidirectional communication with customers or to facili-tate the collaboration between employees amongst each other. Thereby, customer posts in a company’s Social Media channels capture consumers’ current attitude towards product and service offerings or the enterprise as a whole. An automatic analysis of these posts does not only provide a firm with valuable knowledge on the customer relationship, but also frees up human resources in case the posts were screened by employees manually hitherto. However, posts in Social Media channels of SMEs are char-acterized by certain peculiarities such as regional slang or off-topic discussions amongst others. The study at hand investigates the impact of such characteristics on the accuracy of results received from an automatic sentiment analysis of corresponding posts. In this context, we revert to Social Media posts of five SMEs from southern Germany. The results show that an adaption of approaches used for senti-ment analysis to the specific language of customers and firms is mandatory for achieving a high level of accuracy.
Quantum Impurity in Luttinger Liquid: Universal Conductance with Entanglement Renormalization
Creators: name: Lo, Ya-Lin
name: Hsieh, Yun-Da
name: Hou, Chang-Yu
name: Chen, Pochung
name: Kao, Ying-Jer
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study numerically the universal conductance of Luttinger liquids wire with a single impurity via the Muti-scale Entanglement Renormalization Ansatz (MERA). The scale invariant MERA provides an efficient way to extract scaling operators and scaling dimensions for both the bulk and the boundary conformal field theories. By utilizing the key relationship between the conductance tensor and ground-state correlation function, the universal conductance can be evaluated within the framework of the boundary MERA. We construct the boundary MERA to compute the correlation functions and scaling dimensions for the Kane-Fisher fixed points by modeling the single impurity as a junction (weak link) of two interacting wires. We show that the universal behavior of the junction can be easily identified within the MERA and argue that the boundary MERA framework has tremendous potential to classify the fixed points in general multi-wire junctions.
description: 14 pages, 18 figures